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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0a1a9b4942
The return value of the pci_find_(ext_)capability() is either zero or the position of a capability. It is never negative. This patch consolidates the form of check from (pos <= 0) to (!pos). Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
4602 lines
119 KiB
C
4602 lines
119 KiB
C
/*
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* PCI Bus Services, see include/linux/pci.h for further explanation.
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*
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* Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
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* David Mosberger-Tang
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*
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* Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
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*/
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_pci.h>
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#include <linux/pci.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/log2.h>
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#include <linux/pci-aspm.h>
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#include <linux/pm_wakeup.h>
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/pm_runtime.h>
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#include <linux/pci_hotplug.h>
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#include <asm-generic/pci-bridge.h>
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#include <asm/setup.h>
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#include "pci.h"
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const char *pci_power_names[] = {
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"error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown",
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};
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EXPORT_SYMBOL_GPL(pci_power_names);
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int isa_dma_bridge_buggy;
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EXPORT_SYMBOL(isa_dma_bridge_buggy);
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int pci_pci_problems;
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EXPORT_SYMBOL(pci_pci_problems);
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unsigned int pci_pm_d3_delay;
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static void pci_pme_list_scan(struct work_struct *work);
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static LIST_HEAD(pci_pme_list);
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static DEFINE_MUTEX(pci_pme_list_mutex);
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static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan);
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struct pci_pme_device {
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struct list_head list;
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struct pci_dev *dev;
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};
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#define PME_TIMEOUT 1000 /* How long between PME checks */
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static void pci_dev_d3_sleep(struct pci_dev *dev)
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{
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unsigned int delay = dev->d3_delay;
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if (delay < pci_pm_d3_delay)
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delay = pci_pm_d3_delay;
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msleep(delay);
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}
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#ifdef CONFIG_PCI_DOMAINS
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int pci_domains_supported = 1;
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#endif
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#define DEFAULT_CARDBUS_IO_SIZE (256)
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#define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
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/* pci=cbmemsize=nnM,cbiosize=nn can override this */
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unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE;
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unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE;
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#define DEFAULT_HOTPLUG_IO_SIZE (256)
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#define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
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/* pci=hpmemsize=nnM,hpiosize=nn can override this */
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unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE;
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unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE;
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enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_TUNE_OFF;
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/*
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* The default CLS is used if arch didn't set CLS explicitly and not
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* all pci devices agree on the same value. Arch can override either
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* the dfl or actual value as it sees fit. Don't forget this is
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* measured in 32-bit words, not bytes.
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*/
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u8 pci_dfl_cache_line_size = L1_CACHE_BYTES >> 2;
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u8 pci_cache_line_size;
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/*
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* If we set up a device for bus mastering, we need to check the latency
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* timer as certain BIOSes forget to set it properly.
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*/
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unsigned int pcibios_max_latency = 255;
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/* If set, the PCIe ARI capability will not be used. */
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static bool pcie_ari_disabled;
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/**
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* pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
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* @bus: pointer to PCI bus structure to search
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*
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* Given a PCI bus, returns the highest PCI bus number present in the set
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* including the given PCI bus and its list of child PCI buses.
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*/
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unsigned char pci_bus_max_busnr(struct pci_bus *bus)
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{
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struct pci_bus *tmp;
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unsigned char max, n;
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max = bus->busn_res.end;
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list_for_each_entry(tmp, &bus->children, node) {
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n = pci_bus_max_busnr(tmp);
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if (n > max)
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max = n;
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}
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return max;
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}
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EXPORT_SYMBOL_GPL(pci_bus_max_busnr);
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#ifdef CONFIG_HAS_IOMEM
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void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
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{
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struct resource *res = &pdev->resource[bar];
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/*
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* Make sure the BAR is actually a memory resource, not an IO resource
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*/
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if (res->flags & IORESOURCE_UNSET || !(res->flags & IORESOURCE_MEM)) {
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dev_warn(&pdev->dev, "can't ioremap BAR %d: %pR\n", bar, res);
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return NULL;
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}
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return ioremap_nocache(res->start, resource_size(res));
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}
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EXPORT_SYMBOL_GPL(pci_ioremap_bar);
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#endif
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static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn,
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u8 pos, int cap, int *ttl)
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{
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u8 id;
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u16 ent;
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pci_bus_read_config_byte(bus, devfn, pos, &pos);
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while ((*ttl)--) {
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if (pos < 0x40)
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break;
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pos &= ~3;
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pci_bus_read_config_word(bus, devfn, pos, &ent);
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id = ent & 0xff;
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if (id == 0xff)
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break;
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if (id == cap)
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return pos;
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pos = (ent >> 8);
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}
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return 0;
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}
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static int __pci_find_next_cap(struct pci_bus *bus, unsigned int devfn,
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u8 pos, int cap)
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{
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int ttl = PCI_FIND_CAP_TTL;
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return __pci_find_next_cap_ttl(bus, devfn, pos, cap, &ttl);
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}
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int pci_find_next_capability(struct pci_dev *dev, u8 pos, int cap)
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{
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return __pci_find_next_cap(dev->bus, dev->devfn,
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pos + PCI_CAP_LIST_NEXT, cap);
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}
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EXPORT_SYMBOL_GPL(pci_find_next_capability);
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static int __pci_bus_find_cap_start(struct pci_bus *bus,
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unsigned int devfn, u8 hdr_type)
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{
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u16 status;
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pci_bus_read_config_word(bus, devfn, PCI_STATUS, &status);
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if (!(status & PCI_STATUS_CAP_LIST))
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return 0;
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switch (hdr_type) {
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case PCI_HEADER_TYPE_NORMAL:
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case PCI_HEADER_TYPE_BRIDGE:
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return PCI_CAPABILITY_LIST;
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case PCI_HEADER_TYPE_CARDBUS:
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return PCI_CB_CAPABILITY_LIST;
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default:
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return 0;
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}
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return 0;
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}
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/**
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* pci_find_capability - query for devices' capabilities
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* @dev: PCI device to query
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* @cap: capability code
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*
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* Tell if a device supports a given PCI capability.
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* Returns the address of the requested capability structure within the
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* device's PCI configuration space or 0 in case the device does not
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* support it. Possible values for @cap:
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*
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* %PCI_CAP_ID_PM Power Management
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* %PCI_CAP_ID_AGP Accelerated Graphics Port
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* %PCI_CAP_ID_VPD Vital Product Data
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* %PCI_CAP_ID_SLOTID Slot Identification
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* %PCI_CAP_ID_MSI Message Signalled Interrupts
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* %PCI_CAP_ID_CHSWP CompactPCI HotSwap
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* %PCI_CAP_ID_PCIX PCI-X
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* %PCI_CAP_ID_EXP PCI Express
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*/
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int pci_find_capability(struct pci_dev *dev, int cap)
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{
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int pos;
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pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
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if (pos)
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pos = __pci_find_next_cap(dev->bus, dev->devfn, pos, cap);
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return pos;
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}
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EXPORT_SYMBOL(pci_find_capability);
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/**
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* pci_bus_find_capability - query for devices' capabilities
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* @bus: the PCI bus to query
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* @devfn: PCI device to query
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* @cap: capability code
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*
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* Like pci_find_capability() but works for pci devices that do not have a
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* pci_dev structure set up yet.
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*
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* Returns the address of the requested capability structure within the
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* device's PCI configuration space or 0 in case the device does not
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* support it.
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*/
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int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap)
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{
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int pos;
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u8 hdr_type;
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pci_bus_read_config_byte(bus, devfn, PCI_HEADER_TYPE, &hdr_type);
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pos = __pci_bus_find_cap_start(bus, devfn, hdr_type & 0x7f);
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if (pos)
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pos = __pci_find_next_cap(bus, devfn, pos, cap);
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return pos;
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}
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EXPORT_SYMBOL(pci_bus_find_capability);
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/**
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* pci_find_next_ext_capability - Find an extended capability
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* @dev: PCI device to query
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* @start: address at which to start looking (0 to start at beginning of list)
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* @cap: capability code
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*
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* Returns the address of the next matching extended capability structure
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* within the device's PCI configuration space or 0 if the device does
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* not support it. Some capabilities can occur several times, e.g., the
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* vendor-specific capability, and this provides a way to find them all.
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*/
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int pci_find_next_ext_capability(struct pci_dev *dev, int start, int cap)
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{
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u32 header;
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int ttl;
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int pos = PCI_CFG_SPACE_SIZE;
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/* minimum 8 bytes per capability */
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ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8;
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if (dev->cfg_size <= PCI_CFG_SPACE_SIZE)
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return 0;
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if (start)
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pos = start;
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if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
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return 0;
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/*
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* If we have no capabilities, this is indicated by cap ID,
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* cap version and next pointer all being 0.
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*/
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if (header == 0)
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return 0;
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while (ttl-- > 0) {
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if (PCI_EXT_CAP_ID(header) == cap && pos != start)
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return pos;
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pos = PCI_EXT_CAP_NEXT(header);
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if (pos < PCI_CFG_SPACE_SIZE)
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break;
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if (pci_read_config_dword(dev, pos, &header) != PCIBIOS_SUCCESSFUL)
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break;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(pci_find_next_ext_capability);
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/**
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* pci_find_ext_capability - Find an extended capability
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* @dev: PCI device to query
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* @cap: capability code
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*
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* Returns the address of the requested extended capability structure
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* within the device's PCI configuration space or 0 if the device does
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* not support it. Possible values for @cap:
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*
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* %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
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* %PCI_EXT_CAP_ID_VC Virtual Channel
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* %PCI_EXT_CAP_ID_DSN Device Serial Number
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* %PCI_EXT_CAP_ID_PWR Power Budgeting
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*/
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int pci_find_ext_capability(struct pci_dev *dev, int cap)
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{
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return pci_find_next_ext_capability(dev, 0, cap);
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}
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EXPORT_SYMBOL_GPL(pci_find_ext_capability);
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static int __pci_find_next_ht_cap(struct pci_dev *dev, int pos, int ht_cap)
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{
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int rc, ttl = PCI_FIND_CAP_TTL;
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u8 cap, mask;
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if (ht_cap == HT_CAPTYPE_SLAVE || ht_cap == HT_CAPTYPE_HOST)
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mask = HT_3BIT_CAP_MASK;
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else
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mask = HT_5BIT_CAP_MASK;
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pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn, pos,
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PCI_CAP_ID_HT, &ttl);
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while (pos) {
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rc = pci_read_config_byte(dev, pos + 3, &cap);
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if (rc != PCIBIOS_SUCCESSFUL)
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return 0;
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if ((cap & mask) == ht_cap)
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return pos;
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pos = __pci_find_next_cap_ttl(dev->bus, dev->devfn,
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pos + PCI_CAP_LIST_NEXT,
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PCI_CAP_ID_HT, &ttl);
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}
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return 0;
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}
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/**
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* pci_find_next_ht_capability - query a device's Hypertransport capabilities
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* @dev: PCI device to query
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* @pos: Position from which to continue searching
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* @ht_cap: Hypertransport capability code
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*
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* To be used in conjunction with pci_find_ht_capability() to search for
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* all capabilities matching @ht_cap. @pos should always be a value returned
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* from pci_find_ht_capability().
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*
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* NB. To be 100% safe against broken PCI devices, the caller should take
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* steps to avoid an infinite loop.
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*/
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int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap)
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{
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return __pci_find_next_ht_cap(dev, pos + PCI_CAP_LIST_NEXT, ht_cap);
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}
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EXPORT_SYMBOL_GPL(pci_find_next_ht_capability);
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/**
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* pci_find_ht_capability - query a device's Hypertransport capabilities
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* @dev: PCI device to query
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* @ht_cap: Hypertransport capability code
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*
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* Tell if a device supports a given Hypertransport capability.
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* Returns an address within the device's PCI configuration space
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* or 0 in case the device does not support the request capability.
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* The address points to the PCI capability, of type PCI_CAP_ID_HT,
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* which has a Hypertransport capability matching @ht_cap.
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*/
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int pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
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{
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int pos;
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pos = __pci_bus_find_cap_start(dev->bus, dev->devfn, dev->hdr_type);
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if (pos)
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pos = __pci_find_next_ht_cap(dev, pos, ht_cap);
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return pos;
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}
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EXPORT_SYMBOL_GPL(pci_find_ht_capability);
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/**
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* pci_find_parent_resource - return resource region of parent bus of given region
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* @dev: PCI device structure contains resources to be searched
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* @res: child resource record for which parent is sought
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*
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* For given resource region of given device, return the resource
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* region of parent bus the given region is contained in.
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*/
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struct resource *pci_find_parent_resource(const struct pci_dev *dev,
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struct resource *res)
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{
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const struct pci_bus *bus = dev->bus;
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struct resource *r;
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int i;
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pci_bus_for_each_resource(bus, r, i) {
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if (!r)
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continue;
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if (res->start && resource_contains(r, res)) {
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/*
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* If the window is prefetchable but the BAR is
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* not, the allocator made a mistake.
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*/
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if (r->flags & IORESOURCE_PREFETCH &&
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!(res->flags & IORESOURCE_PREFETCH))
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return NULL;
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/*
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* If we're below a transparent bridge, there may
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* be both a positively-decoded aperture and a
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* subtractively-decoded region that contain the BAR.
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* We want the positively-decoded one, so this depends
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* on pci_bus_for_each_resource() giving us those
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* first.
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*/
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return r;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL(pci_find_parent_resource);
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/**
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* pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos
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* @dev: the PCI device to operate on
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* @pos: config space offset of status word
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* @mask: mask of bit(s) to care about in status word
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*
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* Return 1 when mask bit(s) in status word clear, 0 otherwise.
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*/
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int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask)
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{
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int i;
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/* Wait for Transaction Pending bit clean */
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for (i = 0; i < 4; i++) {
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u16 status;
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if (i)
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msleep((1 << (i - 1)) * 100);
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pci_read_config_word(dev, pos, &status);
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if (!(status & mask))
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return 1;
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}
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return 0;
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}
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/**
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* pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
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* @dev: PCI device to have its BARs restored
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*
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* Restore the BAR values for a given device, so as to make it
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* accessible by its driver.
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*/
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static void pci_restore_bars(struct pci_dev *dev)
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{
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int i;
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for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
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pci_update_resource(dev, i);
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}
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static struct pci_platform_pm_ops *pci_platform_pm;
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int pci_set_platform_pm(struct pci_platform_pm_ops *ops)
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{
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if (!ops->is_manageable || !ops->set_state || !ops->choose_state
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|| !ops->sleep_wake)
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return -EINVAL;
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pci_platform_pm = ops;
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return 0;
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|
}
|
|
|
|
static inline bool platform_pci_power_manageable(struct pci_dev *dev)
|
|
{
|
|
return pci_platform_pm ? pci_platform_pm->is_manageable(dev) : false;
|
|
}
|
|
|
|
static inline int platform_pci_set_power_state(struct pci_dev *dev,
|
|
pci_power_t t)
|
|
{
|
|
return pci_platform_pm ? pci_platform_pm->set_state(dev, t) : -ENOSYS;
|
|
}
|
|
|
|
static inline pci_power_t platform_pci_choose_state(struct pci_dev *dev)
|
|
{
|
|
return pci_platform_pm ?
|
|
pci_platform_pm->choose_state(dev) : PCI_POWER_ERROR;
|
|
}
|
|
|
|
static inline int platform_pci_sleep_wake(struct pci_dev *dev, bool enable)
|
|
{
|
|
return pci_platform_pm ?
|
|
pci_platform_pm->sleep_wake(dev, enable) : -ENODEV;
|
|
}
|
|
|
|
static inline int platform_pci_run_wake(struct pci_dev *dev, bool enable)
|
|
{
|
|
return pci_platform_pm ?
|
|
pci_platform_pm->run_wake(dev, enable) : -ENODEV;
|
|
}
|
|
|
|
static inline bool platform_pci_need_resume(struct pci_dev *dev)
|
|
{
|
|
return pci_platform_pm ? pci_platform_pm->need_resume(dev) : false;
|
|
}
|
|
|
|
/**
|
|
* pci_raw_set_power_state - Use PCI PM registers to set the power state of
|
|
* given PCI device
|
|
* @dev: PCI device to handle.
|
|
* @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
|
|
*
|
|
* RETURN VALUE:
|
|
* -EINVAL if the requested state is invalid.
|
|
* -EIO if device does not support PCI PM or its PM capabilities register has a
|
|
* wrong version, or device doesn't support the requested state.
|
|
* 0 if device already is in the requested state.
|
|
* 0 if device's power state has been successfully changed.
|
|
*/
|
|
static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
u16 pmcsr;
|
|
bool need_restore = false;
|
|
|
|
/* Check if we're already there */
|
|
if (dev->current_state == state)
|
|
return 0;
|
|
|
|
if (!dev->pm_cap)
|
|
return -EIO;
|
|
|
|
if (state < PCI_D0 || state > PCI_D3hot)
|
|
return -EINVAL;
|
|
|
|
/* Validate current state:
|
|
* Can enter D0 from any state, but if we can only go deeper
|
|
* to sleep if we're already in a low power state
|
|
*/
|
|
if (state != PCI_D0 && dev->current_state <= PCI_D3cold
|
|
&& dev->current_state > state) {
|
|
dev_err(&dev->dev, "invalid power transition (from state %d to %d)\n",
|
|
dev->current_state, state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* check if this device supports the desired state */
|
|
if ((state == PCI_D1 && !dev->d1_support)
|
|
|| (state == PCI_D2 && !dev->d2_support))
|
|
return -EIO;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
|
|
/* If we're (effectively) in D3, force entire word to 0.
|
|
* This doesn't affect PME_Status, disables PME_En, and
|
|
* sets PowerState to 0.
|
|
*/
|
|
switch (dev->current_state) {
|
|
case PCI_D0:
|
|
case PCI_D1:
|
|
case PCI_D2:
|
|
pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
|
|
pmcsr |= state;
|
|
break;
|
|
case PCI_D3hot:
|
|
case PCI_D3cold:
|
|
case PCI_UNKNOWN: /* Boot-up */
|
|
if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot
|
|
&& !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET))
|
|
need_restore = true;
|
|
/* Fall-through: force to D0 */
|
|
default:
|
|
pmcsr = 0;
|
|
break;
|
|
}
|
|
|
|
/* enter specified state */
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
|
|
|
|
/* Mandatory power management transition delays */
|
|
/* see PCI PM 1.1 5.6.1 table 18 */
|
|
if (state == PCI_D3hot || dev->current_state == PCI_D3hot)
|
|
pci_dev_d3_sleep(dev);
|
|
else if (state == PCI_D2 || dev->current_state == PCI_D2)
|
|
udelay(PCI_PM_D2_DELAY);
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
|
|
if (dev->current_state != state && printk_ratelimit())
|
|
dev_info(&dev->dev, "Refused to change power state, currently in D%d\n",
|
|
dev->current_state);
|
|
|
|
/*
|
|
* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
|
|
* INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
|
|
* from D3hot to D0 _may_ perform an internal reset, thereby
|
|
* going to "D0 Uninitialized" rather than "D0 Initialized".
|
|
* For example, at least some versions of the 3c905B and the
|
|
* 3c556B exhibit this behaviour.
|
|
*
|
|
* At least some laptop BIOSen (e.g. the Thinkpad T21) leave
|
|
* devices in a D3hot state at boot. Consequently, we need to
|
|
* restore at least the BARs so that the device will be
|
|
* accessible to its driver.
|
|
*/
|
|
if (need_restore)
|
|
pci_restore_bars(dev);
|
|
|
|
if (dev->bus->self)
|
|
pcie_aspm_pm_state_change(dev->bus->self);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_update_current_state - Read PCI power state of given device from its
|
|
* PCI PM registers and cache it
|
|
* @dev: PCI device to handle.
|
|
* @state: State to cache in case the device doesn't have the PM capability
|
|
*/
|
|
void pci_update_current_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
if (dev->pm_cap) {
|
|
u16 pmcsr;
|
|
|
|
/*
|
|
* Configuration space is not accessible for device in
|
|
* D3cold, so just keep or set D3cold for safety
|
|
*/
|
|
if (dev->current_state == PCI_D3cold)
|
|
return;
|
|
if (state == PCI_D3cold) {
|
|
dev->current_state = PCI_D3cold;
|
|
return;
|
|
}
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
|
|
} else {
|
|
dev->current_state = state;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_power_up - Put the given device into D0 forcibly
|
|
* @dev: PCI device to power up
|
|
*/
|
|
void pci_power_up(struct pci_dev *dev)
|
|
{
|
|
if (platform_pci_power_manageable(dev))
|
|
platform_pci_set_power_state(dev, PCI_D0);
|
|
|
|
pci_raw_set_power_state(dev, PCI_D0);
|
|
pci_update_current_state(dev, PCI_D0);
|
|
}
|
|
|
|
/**
|
|
* pci_platform_power_transition - Use platform to change device power state
|
|
* @dev: PCI device to handle.
|
|
* @state: State to put the device into.
|
|
*/
|
|
static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
int error;
|
|
|
|
if (platform_pci_power_manageable(dev)) {
|
|
error = platform_pci_set_power_state(dev, state);
|
|
if (!error)
|
|
pci_update_current_state(dev, state);
|
|
} else
|
|
error = -ENODEV;
|
|
|
|
if (error && !dev->pm_cap) /* Fall back to PCI_D0 */
|
|
dev->current_state = PCI_D0;
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* pci_wakeup - Wake up a PCI device
|
|
* @pci_dev: Device to handle.
|
|
* @ign: ignored parameter
|
|
*/
|
|
static int pci_wakeup(struct pci_dev *pci_dev, void *ign)
|
|
{
|
|
pci_wakeup_event(pci_dev);
|
|
pm_request_resume(&pci_dev->dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_wakeup_bus - Walk given bus and wake up devices on it
|
|
* @bus: Top bus of the subtree to walk.
|
|
*/
|
|
static void pci_wakeup_bus(struct pci_bus *bus)
|
|
{
|
|
if (bus)
|
|
pci_walk_bus(bus, pci_wakeup, NULL);
|
|
}
|
|
|
|
/**
|
|
* __pci_start_power_transition - Start power transition of a PCI device
|
|
* @dev: PCI device to handle.
|
|
* @state: State to put the device into.
|
|
*/
|
|
static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
if (state == PCI_D0) {
|
|
pci_platform_power_transition(dev, PCI_D0);
|
|
/*
|
|
* Mandatory power management transition delays, see
|
|
* PCI Express Base Specification Revision 2.0 Section
|
|
* 6.6.1: Conventional Reset. Do not delay for
|
|
* devices powered on/off by corresponding bridge,
|
|
* because have already delayed for the bridge.
|
|
*/
|
|
if (dev->runtime_d3cold) {
|
|
msleep(dev->d3cold_delay);
|
|
/*
|
|
* When powering on a bridge from D3cold, the
|
|
* whole hierarchy may be powered on into
|
|
* D0uninitialized state, resume them to give
|
|
* them a chance to suspend again
|
|
*/
|
|
pci_wakeup_bus(dev->subordinate);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __pci_dev_set_current_state - Set current state of a PCI device
|
|
* @dev: Device to handle
|
|
* @data: pointer to state to be set
|
|
*/
|
|
static int __pci_dev_set_current_state(struct pci_dev *dev, void *data)
|
|
{
|
|
pci_power_t state = *(pci_power_t *)data;
|
|
|
|
dev->current_state = state;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __pci_bus_set_current_state - Walk given bus and set current state of devices
|
|
* @bus: Top bus of the subtree to walk.
|
|
* @state: state to be set
|
|
*/
|
|
static void __pci_bus_set_current_state(struct pci_bus *bus, pci_power_t state)
|
|
{
|
|
if (bus)
|
|
pci_walk_bus(bus, __pci_dev_set_current_state, &state);
|
|
}
|
|
|
|
/**
|
|
* __pci_complete_power_transition - Complete power transition of a PCI device
|
|
* @dev: PCI device to handle.
|
|
* @state: State to put the device into.
|
|
*
|
|
* This function should not be called directly by device drivers.
|
|
*/
|
|
int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
int ret;
|
|
|
|
if (state <= PCI_D0)
|
|
return -EINVAL;
|
|
ret = pci_platform_power_transition(dev, state);
|
|
/* Power off the bridge may power off the whole hierarchy */
|
|
if (!ret && state == PCI_D3cold)
|
|
__pci_bus_set_current_state(dev->subordinate, PCI_D3cold);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pci_complete_power_transition);
|
|
|
|
/**
|
|
* pci_set_power_state - Set the power state of a PCI device
|
|
* @dev: PCI device to handle.
|
|
* @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
|
|
*
|
|
* Transition a device to a new power state, using the platform firmware and/or
|
|
* the device's PCI PM registers.
|
|
*
|
|
* RETURN VALUE:
|
|
* -EINVAL if the requested state is invalid.
|
|
* -EIO if device does not support PCI PM or its PM capabilities register has a
|
|
* wrong version, or device doesn't support the requested state.
|
|
* 0 if device already is in the requested state.
|
|
* 0 if device's power state has been successfully changed.
|
|
*/
|
|
int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
int error;
|
|
|
|
/* bound the state we're entering */
|
|
if (state > PCI_D3cold)
|
|
state = PCI_D3cold;
|
|
else if (state < PCI_D0)
|
|
state = PCI_D0;
|
|
else if ((state == PCI_D1 || state == PCI_D2) && pci_no_d1d2(dev))
|
|
/*
|
|
* If the device or the parent bridge do not support PCI PM,
|
|
* ignore the request if we're doing anything other than putting
|
|
* it into D0 (which would only happen on boot).
|
|
*/
|
|
return 0;
|
|
|
|
/* Check if we're already there */
|
|
if (dev->current_state == state)
|
|
return 0;
|
|
|
|
__pci_start_power_transition(dev, state);
|
|
|
|
/* This device is quirked not to be put into D3, so
|
|
don't put it in D3 */
|
|
if (state >= PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
|
|
return 0;
|
|
|
|
/*
|
|
* To put device in D3cold, we put device into D3hot in native
|
|
* way, then put device into D3cold with platform ops
|
|
*/
|
|
error = pci_raw_set_power_state(dev, state > PCI_D3hot ?
|
|
PCI_D3hot : state);
|
|
|
|
if (!__pci_complete_power_transition(dev, state))
|
|
error = 0;
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(pci_set_power_state);
|
|
|
|
/**
|
|
* pci_choose_state - Choose the power state of a PCI device
|
|
* @dev: PCI device to be suspended
|
|
* @state: target sleep state for the whole system. This is the value
|
|
* that is passed to suspend() function.
|
|
*
|
|
* Returns PCI power state suitable for given device and given system
|
|
* message.
|
|
*/
|
|
|
|
pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
|
|
{
|
|
pci_power_t ret;
|
|
|
|
if (!dev->pm_cap)
|
|
return PCI_D0;
|
|
|
|
ret = platform_pci_choose_state(dev);
|
|
if (ret != PCI_POWER_ERROR)
|
|
return ret;
|
|
|
|
switch (state.event) {
|
|
case PM_EVENT_ON:
|
|
return PCI_D0;
|
|
case PM_EVENT_FREEZE:
|
|
case PM_EVENT_PRETHAW:
|
|
/* REVISIT both freeze and pre-thaw "should" use D0 */
|
|
case PM_EVENT_SUSPEND:
|
|
case PM_EVENT_HIBERNATE:
|
|
return PCI_D3hot;
|
|
default:
|
|
dev_info(&dev->dev, "unrecognized suspend event %d\n",
|
|
state.event);
|
|
BUG();
|
|
}
|
|
return PCI_D0;
|
|
}
|
|
EXPORT_SYMBOL(pci_choose_state);
|
|
|
|
#define PCI_EXP_SAVE_REGS 7
|
|
|
|
static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev,
|
|
u16 cap, bool extended)
|
|
{
|
|
struct pci_cap_saved_state *tmp;
|
|
|
|
hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) {
|
|
if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap)
|
|
return tmp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap)
|
|
{
|
|
return _pci_find_saved_cap(dev, cap, false);
|
|
}
|
|
|
|
struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap)
|
|
{
|
|
return _pci_find_saved_cap(dev, cap, true);
|
|
}
|
|
|
|
static int pci_save_pcie_state(struct pci_dev *dev)
|
|
{
|
|
int i = 0;
|
|
struct pci_cap_saved_state *save_state;
|
|
u16 *cap;
|
|
|
|
if (!pci_is_pcie(dev))
|
|
return 0;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
|
|
if (!save_state) {
|
|
dev_err(&dev->dev, "buffer not found in %s\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cap = (u16 *)&save_state->cap.data[0];
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_LNKCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_SLTCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_RTCTL, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL2, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_LNKCTL2, &cap[i++]);
|
|
pcie_capability_read_word(dev, PCI_EXP_SLTCTL2, &cap[i++]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pci_restore_pcie_state(struct pci_dev *dev)
|
|
{
|
|
int i = 0;
|
|
struct pci_cap_saved_state *save_state;
|
|
u16 *cap;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
|
|
if (!save_state)
|
|
return;
|
|
|
|
cap = (u16 *)&save_state->cap.data[0];
|
|
pcie_capability_write_word(dev, PCI_EXP_DEVCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_LNKCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_SLTCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_RTCTL, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_DEVCTL2, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_LNKCTL2, cap[i++]);
|
|
pcie_capability_write_word(dev, PCI_EXP_SLTCTL2, cap[i++]);
|
|
}
|
|
|
|
|
|
static int pci_save_pcix_state(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
struct pci_cap_saved_state *save_state;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!pos)
|
|
return 0;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
|
|
if (!save_state) {
|
|
dev_err(&dev->dev, "buffer not found in %s\n", __func__);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pci_read_config_word(dev, pos + PCI_X_CMD,
|
|
(u16 *)save_state->cap.data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pci_restore_pcix_state(struct pci_dev *dev)
|
|
{
|
|
int i = 0, pos;
|
|
struct pci_cap_saved_state *save_state;
|
|
u16 *cap;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!save_state || !pos)
|
|
return;
|
|
cap = (u16 *)&save_state->cap.data[0];
|
|
|
|
pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
|
|
}
|
|
|
|
|
|
/**
|
|
* pci_save_state - save the PCI configuration space of a device before suspending
|
|
* @dev: - PCI device that we're dealing with
|
|
*/
|
|
int pci_save_state(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
/* XXX: 100% dword access ok here? */
|
|
for (i = 0; i < 16; i++)
|
|
pci_read_config_dword(dev, i * 4, &dev->saved_config_space[i]);
|
|
dev->state_saved = true;
|
|
|
|
i = pci_save_pcie_state(dev);
|
|
if (i != 0)
|
|
return i;
|
|
|
|
i = pci_save_pcix_state(dev);
|
|
if (i != 0)
|
|
return i;
|
|
|
|
return pci_save_vc_state(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_save_state);
|
|
|
|
static void pci_restore_config_dword(struct pci_dev *pdev, int offset,
|
|
u32 saved_val, int retry)
|
|
{
|
|
u32 val;
|
|
|
|
pci_read_config_dword(pdev, offset, &val);
|
|
if (val == saved_val)
|
|
return;
|
|
|
|
for (;;) {
|
|
dev_dbg(&pdev->dev, "restoring config space at offset %#x (was %#x, writing %#x)\n",
|
|
offset, val, saved_val);
|
|
pci_write_config_dword(pdev, offset, saved_val);
|
|
if (retry-- <= 0)
|
|
return;
|
|
|
|
pci_read_config_dword(pdev, offset, &val);
|
|
if (val == saved_val)
|
|
return;
|
|
|
|
mdelay(1);
|
|
}
|
|
}
|
|
|
|
static void pci_restore_config_space_range(struct pci_dev *pdev,
|
|
int start, int end, int retry)
|
|
{
|
|
int index;
|
|
|
|
for (index = end; index >= start; index--)
|
|
pci_restore_config_dword(pdev, 4 * index,
|
|
pdev->saved_config_space[index],
|
|
retry);
|
|
}
|
|
|
|
static void pci_restore_config_space(struct pci_dev *pdev)
|
|
{
|
|
if (pdev->hdr_type == PCI_HEADER_TYPE_NORMAL) {
|
|
pci_restore_config_space_range(pdev, 10, 15, 0);
|
|
/* Restore BARs before the command register. */
|
|
pci_restore_config_space_range(pdev, 4, 9, 10);
|
|
pci_restore_config_space_range(pdev, 0, 3, 0);
|
|
} else {
|
|
pci_restore_config_space_range(pdev, 0, 15, 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_restore_state - Restore the saved state of a PCI device
|
|
* @dev: - PCI device that we're dealing with
|
|
*/
|
|
void pci_restore_state(struct pci_dev *dev)
|
|
{
|
|
if (!dev->state_saved)
|
|
return;
|
|
|
|
/* PCI Express register must be restored first */
|
|
pci_restore_pcie_state(dev);
|
|
pci_restore_ats_state(dev);
|
|
pci_restore_vc_state(dev);
|
|
|
|
pci_restore_config_space(dev);
|
|
|
|
pci_restore_pcix_state(dev);
|
|
pci_restore_msi_state(dev);
|
|
pci_restore_iov_state(dev);
|
|
|
|
dev->state_saved = false;
|
|
}
|
|
EXPORT_SYMBOL(pci_restore_state);
|
|
|
|
struct pci_saved_state {
|
|
u32 config_space[16];
|
|
struct pci_cap_saved_data cap[0];
|
|
};
|
|
|
|
/**
|
|
* pci_store_saved_state - Allocate and return an opaque struct containing
|
|
* the device saved state.
|
|
* @dev: PCI device that we're dealing with
|
|
*
|
|
* Return NULL if no state or error.
|
|
*/
|
|
struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev)
|
|
{
|
|
struct pci_saved_state *state;
|
|
struct pci_cap_saved_state *tmp;
|
|
struct pci_cap_saved_data *cap;
|
|
size_t size;
|
|
|
|
if (!dev->state_saved)
|
|
return NULL;
|
|
|
|
size = sizeof(*state) + sizeof(struct pci_cap_saved_data);
|
|
|
|
hlist_for_each_entry(tmp, &dev->saved_cap_space, next)
|
|
size += sizeof(struct pci_cap_saved_data) + tmp->cap.size;
|
|
|
|
state = kzalloc(size, GFP_KERNEL);
|
|
if (!state)
|
|
return NULL;
|
|
|
|
memcpy(state->config_space, dev->saved_config_space,
|
|
sizeof(state->config_space));
|
|
|
|
cap = state->cap;
|
|
hlist_for_each_entry(tmp, &dev->saved_cap_space, next) {
|
|
size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size;
|
|
memcpy(cap, &tmp->cap, len);
|
|
cap = (struct pci_cap_saved_data *)((u8 *)cap + len);
|
|
}
|
|
/* Empty cap_save terminates list */
|
|
|
|
return state;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_store_saved_state);
|
|
|
|
/**
|
|
* pci_load_saved_state - Reload the provided save state into struct pci_dev.
|
|
* @dev: PCI device that we're dealing with
|
|
* @state: Saved state returned from pci_store_saved_state()
|
|
*/
|
|
int pci_load_saved_state(struct pci_dev *dev,
|
|
struct pci_saved_state *state)
|
|
{
|
|
struct pci_cap_saved_data *cap;
|
|
|
|
dev->state_saved = false;
|
|
|
|
if (!state)
|
|
return 0;
|
|
|
|
memcpy(dev->saved_config_space, state->config_space,
|
|
sizeof(state->config_space));
|
|
|
|
cap = state->cap;
|
|
while (cap->size) {
|
|
struct pci_cap_saved_state *tmp;
|
|
|
|
tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended);
|
|
if (!tmp || tmp->cap.size != cap->size)
|
|
return -EINVAL;
|
|
|
|
memcpy(tmp->cap.data, cap->data, tmp->cap.size);
|
|
cap = (struct pci_cap_saved_data *)((u8 *)cap +
|
|
sizeof(struct pci_cap_saved_data) + cap->size);
|
|
}
|
|
|
|
dev->state_saved = true;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_load_saved_state);
|
|
|
|
/**
|
|
* pci_load_and_free_saved_state - Reload the save state pointed to by state,
|
|
* and free the memory allocated for it.
|
|
* @dev: PCI device that we're dealing with
|
|
* @state: Pointer to saved state returned from pci_store_saved_state()
|
|
*/
|
|
int pci_load_and_free_saved_state(struct pci_dev *dev,
|
|
struct pci_saved_state **state)
|
|
{
|
|
int ret = pci_load_saved_state(dev, *state);
|
|
kfree(*state);
|
|
*state = NULL;
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state);
|
|
|
|
int __weak pcibios_enable_device(struct pci_dev *dev, int bars)
|
|
{
|
|
return pci_enable_resources(dev, bars);
|
|
}
|
|
|
|
static int do_pci_enable_device(struct pci_dev *dev, int bars)
|
|
{
|
|
int err;
|
|
struct pci_dev *bridge;
|
|
u16 cmd;
|
|
u8 pin;
|
|
|
|
err = pci_set_power_state(dev, PCI_D0);
|
|
if (err < 0 && err != -EIO)
|
|
return err;
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge)
|
|
pcie_aspm_powersave_config_link(bridge);
|
|
|
|
err = pcibios_enable_device(dev, bars);
|
|
if (err < 0)
|
|
return err;
|
|
pci_fixup_device(pci_fixup_enable, dev);
|
|
|
|
if (dev->msi_enabled || dev->msix_enabled)
|
|
return 0;
|
|
|
|
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
|
|
if (pin) {
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (cmd & PCI_COMMAND_INTX_DISABLE)
|
|
pci_write_config_word(dev, PCI_COMMAND,
|
|
cmd & ~PCI_COMMAND_INTX_DISABLE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_reenable_device - Resume abandoned device
|
|
* @dev: PCI device to be resumed
|
|
*
|
|
* Note this function is a backend of pci_default_resume and is not supposed
|
|
* to be called by normal code, write proper resume handler and use it instead.
|
|
*/
|
|
int pci_reenable_device(struct pci_dev *dev)
|
|
{
|
|
if (pci_is_enabled(dev))
|
|
return do_pci_enable_device(dev, (1 << PCI_NUM_RESOURCES) - 1);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pci_reenable_device);
|
|
|
|
static void pci_enable_bridge(struct pci_dev *dev)
|
|
{
|
|
struct pci_dev *bridge;
|
|
int retval;
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge)
|
|
pci_enable_bridge(bridge);
|
|
|
|
if (pci_is_enabled(dev)) {
|
|
if (!dev->is_busmaster)
|
|
pci_set_master(dev);
|
|
return;
|
|
}
|
|
|
|
retval = pci_enable_device(dev);
|
|
if (retval)
|
|
dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n",
|
|
retval);
|
|
pci_set_master(dev);
|
|
}
|
|
|
|
static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
|
|
{
|
|
struct pci_dev *bridge;
|
|
int err;
|
|
int i, bars = 0;
|
|
|
|
/*
|
|
* Power state could be unknown at this point, either due to a fresh
|
|
* boot or a device removal call. So get the current power state
|
|
* so that things like MSI message writing will behave as expected
|
|
* (e.g. if the device really is in D0 at enable time).
|
|
*/
|
|
if (dev->pm_cap) {
|
|
u16 pmcsr;
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
|
|
}
|
|
|
|
if (atomic_inc_return(&dev->enable_cnt) > 1)
|
|
return 0; /* already enabled */
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge)
|
|
pci_enable_bridge(bridge);
|
|
|
|
/* only skip sriov related */
|
|
for (i = 0; i <= PCI_ROM_RESOURCE; i++)
|
|
if (dev->resource[i].flags & flags)
|
|
bars |= (1 << i);
|
|
for (i = PCI_BRIDGE_RESOURCES; i < DEVICE_COUNT_RESOURCE; i++)
|
|
if (dev->resource[i].flags & flags)
|
|
bars |= (1 << i);
|
|
|
|
err = do_pci_enable_device(dev, bars);
|
|
if (err < 0)
|
|
atomic_dec(&dev->enable_cnt);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_device_io - Initialize a device for use with IO space
|
|
* @dev: PCI device to be initialized
|
|
*
|
|
* Initialize device before it's used by a driver. Ask low-level code
|
|
* to enable I/O resources. Wake up the device if it was suspended.
|
|
* Beware, this function can fail.
|
|
*/
|
|
int pci_enable_device_io(struct pci_dev *dev)
|
|
{
|
|
return pci_enable_device_flags(dev, IORESOURCE_IO);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_device_io);
|
|
|
|
/**
|
|
* pci_enable_device_mem - Initialize a device for use with Memory space
|
|
* @dev: PCI device to be initialized
|
|
*
|
|
* Initialize device before it's used by a driver. Ask low-level code
|
|
* to enable Memory resources. Wake up the device if it was suspended.
|
|
* Beware, this function can fail.
|
|
*/
|
|
int pci_enable_device_mem(struct pci_dev *dev)
|
|
{
|
|
return pci_enable_device_flags(dev, IORESOURCE_MEM);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_device_mem);
|
|
|
|
/**
|
|
* pci_enable_device - Initialize device before it's used by a driver.
|
|
* @dev: PCI device to be initialized
|
|
*
|
|
* Initialize device before it's used by a driver. Ask low-level code
|
|
* to enable I/O and memory. Wake up the device if it was suspended.
|
|
* Beware, this function can fail.
|
|
*
|
|
* Note we don't actually enable the device many times if we call
|
|
* this function repeatedly (we just increment the count).
|
|
*/
|
|
int pci_enable_device(struct pci_dev *dev)
|
|
{
|
|
return pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_device);
|
|
|
|
/*
|
|
* Managed PCI resources. This manages device on/off, intx/msi/msix
|
|
* on/off and BAR regions. pci_dev itself records msi/msix status, so
|
|
* there's no need to track it separately. pci_devres is initialized
|
|
* when a device is enabled using managed PCI device enable interface.
|
|
*/
|
|
struct pci_devres {
|
|
unsigned int enabled:1;
|
|
unsigned int pinned:1;
|
|
unsigned int orig_intx:1;
|
|
unsigned int restore_intx:1;
|
|
u32 region_mask;
|
|
};
|
|
|
|
static void pcim_release(struct device *gendev, void *res)
|
|
{
|
|
struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
|
|
struct pci_devres *this = res;
|
|
int i;
|
|
|
|
if (dev->msi_enabled)
|
|
pci_disable_msi(dev);
|
|
if (dev->msix_enabled)
|
|
pci_disable_msix(dev);
|
|
|
|
for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
|
|
if (this->region_mask & (1 << i))
|
|
pci_release_region(dev, i);
|
|
|
|
if (this->restore_intx)
|
|
pci_intx(dev, this->orig_intx);
|
|
|
|
if (this->enabled && !this->pinned)
|
|
pci_disable_device(dev);
|
|
}
|
|
|
|
static struct pci_devres *get_pci_dr(struct pci_dev *pdev)
|
|
{
|
|
struct pci_devres *dr, *new_dr;
|
|
|
|
dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
|
|
if (dr)
|
|
return dr;
|
|
|
|
new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
|
|
if (!new_dr)
|
|
return NULL;
|
|
return devres_get(&pdev->dev, new_dr, NULL, NULL);
|
|
}
|
|
|
|
static struct pci_devres *find_pci_dr(struct pci_dev *pdev)
|
|
{
|
|
if (pci_is_managed(pdev))
|
|
return devres_find(&pdev->dev, pcim_release, NULL, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* pcim_enable_device - Managed pci_enable_device()
|
|
* @pdev: PCI device to be initialized
|
|
*
|
|
* Managed pci_enable_device().
|
|
*/
|
|
int pcim_enable_device(struct pci_dev *pdev)
|
|
{
|
|
struct pci_devres *dr;
|
|
int rc;
|
|
|
|
dr = get_pci_dr(pdev);
|
|
if (unlikely(!dr))
|
|
return -ENOMEM;
|
|
if (dr->enabled)
|
|
return 0;
|
|
|
|
rc = pci_enable_device(pdev);
|
|
if (!rc) {
|
|
pdev->is_managed = 1;
|
|
dr->enabled = 1;
|
|
}
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(pcim_enable_device);
|
|
|
|
/**
|
|
* pcim_pin_device - Pin managed PCI device
|
|
* @pdev: PCI device to pin
|
|
*
|
|
* Pin managed PCI device @pdev. Pinned device won't be disabled on
|
|
* driver detach. @pdev must have been enabled with
|
|
* pcim_enable_device().
|
|
*/
|
|
void pcim_pin_device(struct pci_dev *pdev)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
dr = find_pci_dr(pdev);
|
|
WARN_ON(!dr || !dr->enabled);
|
|
if (dr)
|
|
dr->pinned = 1;
|
|
}
|
|
EXPORT_SYMBOL(pcim_pin_device);
|
|
|
|
/*
|
|
* pcibios_add_device - provide arch specific hooks when adding device dev
|
|
* @dev: the PCI device being added
|
|
*
|
|
* Permits the platform to provide architecture specific functionality when
|
|
* devices are added. This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
int __weak pcibios_add_device(struct pci_dev *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pcibios_release_device - provide arch specific hooks when releasing device dev
|
|
* @dev: the PCI device being released
|
|
*
|
|
* Permits the platform to provide architecture specific functionality when
|
|
* devices are released. This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
void __weak pcibios_release_device(struct pci_dev *dev) {}
|
|
|
|
/**
|
|
* pcibios_disable_device - disable arch specific PCI resources for device dev
|
|
* @dev: the PCI device to disable
|
|
*
|
|
* Disables architecture specific PCI resources for the device. This
|
|
* is the default implementation. Architecture implementations can
|
|
* override this.
|
|
*/
|
|
void __weak pcibios_disable_device (struct pci_dev *dev) {}
|
|
|
|
/**
|
|
* pcibios_penalize_isa_irq - penalize an ISA IRQ
|
|
* @irq: ISA IRQ to penalize
|
|
* @active: IRQ active or not
|
|
*
|
|
* Permits the platform to provide architecture-specific functionality when
|
|
* penalizing ISA IRQs. This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
void __weak pcibios_penalize_isa_irq(int irq, int active) {}
|
|
|
|
static void do_pci_disable_device(struct pci_dev *dev)
|
|
{
|
|
u16 pci_command;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &pci_command);
|
|
if (pci_command & PCI_COMMAND_MASTER) {
|
|
pci_command &= ~PCI_COMMAND_MASTER;
|
|
pci_write_config_word(dev, PCI_COMMAND, pci_command);
|
|
}
|
|
|
|
pcibios_disable_device(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_disable_enabled_device - Disable device without updating enable_cnt
|
|
* @dev: PCI device to disable
|
|
*
|
|
* NOTE: This function is a backend of PCI power management routines and is
|
|
* not supposed to be called drivers.
|
|
*/
|
|
void pci_disable_enabled_device(struct pci_dev *dev)
|
|
{
|
|
if (pci_is_enabled(dev))
|
|
do_pci_disable_device(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_disable_device - Disable PCI device after use
|
|
* @dev: PCI device to be disabled
|
|
*
|
|
* Signal to the system that the PCI device is not in use by the system
|
|
* anymore. This only involves disabling PCI bus-mastering, if active.
|
|
*
|
|
* Note we don't actually disable the device until all callers of
|
|
* pci_enable_device() have called pci_disable_device().
|
|
*/
|
|
void pci_disable_device(struct pci_dev *dev)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
dr = find_pci_dr(dev);
|
|
if (dr)
|
|
dr->enabled = 0;
|
|
|
|
dev_WARN_ONCE(&dev->dev, atomic_read(&dev->enable_cnt) <= 0,
|
|
"disabling already-disabled device");
|
|
|
|
if (atomic_dec_return(&dev->enable_cnt) != 0)
|
|
return;
|
|
|
|
do_pci_disable_device(dev);
|
|
|
|
dev->is_busmaster = 0;
|
|
}
|
|
EXPORT_SYMBOL(pci_disable_device);
|
|
|
|
/**
|
|
* pcibios_set_pcie_reset_state - set reset state for device dev
|
|
* @dev: the PCIe device reset
|
|
* @state: Reset state to enter into
|
|
*
|
|
*
|
|
* Sets the PCIe reset state for the device. This is the default
|
|
* implementation. Architecture implementations can override this.
|
|
*/
|
|
int __weak pcibios_set_pcie_reset_state(struct pci_dev *dev,
|
|
enum pcie_reset_state state)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* pci_set_pcie_reset_state - set reset state for device dev
|
|
* @dev: the PCIe device reset
|
|
* @state: Reset state to enter into
|
|
*
|
|
*
|
|
* Sets the PCI reset state for the device.
|
|
*/
|
|
int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
|
|
{
|
|
return pcibios_set_pcie_reset_state(dev, state);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);
|
|
|
|
/**
|
|
* pci_check_pme_status - Check if given device has generated PME.
|
|
* @dev: Device to check.
|
|
*
|
|
* Check the PME status of the device and if set, clear it and clear PME enable
|
|
* (if set). Return 'true' if PME status and PME enable were both set or
|
|
* 'false' otherwise.
|
|
*/
|
|
bool pci_check_pme_status(struct pci_dev *dev)
|
|
{
|
|
int pmcsr_pos;
|
|
u16 pmcsr;
|
|
bool ret = false;
|
|
|
|
if (!dev->pm_cap)
|
|
return false;
|
|
|
|
pmcsr_pos = dev->pm_cap + PCI_PM_CTRL;
|
|
pci_read_config_word(dev, pmcsr_pos, &pmcsr);
|
|
if (!(pmcsr & PCI_PM_CTRL_PME_STATUS))
|
|
return false;
|
|
|
|
/* Clear PME status. */
|
|
pmcsr |= PCI_PM_CTRL_PME_STATUS;
|
|
if (pmcsr & PCI_PM_CTRL_PME_ENABLE) {
|
|
/* Disable PME to avoid interrupt flood. */
|
|
pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
|
|
ret = true;
|
|
}
|
|
|
|
pci_write_config_word(dev, pmcsr_pos, pmcsr);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
|
|
* @dev: Device to handle.
|
|
* @pme_poll_reset: Whether or not to reset the device's pme_poll flag.
|
|
*
|
|
* Check if @dev has generated PME and queue a resume request for it in that
|
|
* case.
|
|
*/
|
|
static int pci_pme_wakeup(struct pci_dev *dev, void *pme_poll_reset)
|
|
{
|
|
if (pme_poll_reset && dev->pme_poll)
|
|
dev->pme_poll = false;
|
|
|
|
if (pci_check_pme_status(dev)) {
|
|
pci_wakeup_event(dev);
|
|
pm_request_resume(&dev->dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
|
|
* @bus: Top bus of the subtree to walk.
|
|
*/
|
|
void pci_pme_wakeup_bus(struct pci_bus *bus)
|
|
{
|
|
if (bus)
|
|
pci_walk_bus(bus, pci_pme_wakeup, (void *)true);
|
|
}
|
|
|
|
|
|
/**
|
|
* pci_pme_capable - check the capability of PCI device to generate PME#
|
|
* @dev: PCI device to handle.
|
|
* @state: PCI state from which device will issue PME#.
|
|
*/
|
|
bool pci_pme_capable(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
if (!dev->pm_cap)
|
|
return false;
|
|
|
|
return !!(dev->pme_support & (1 << state));
|
|
}
|
|
EXPORT_SYMBOL(pci_pme_capable);
|
|
|
|
static void pci_pme_list_scan(struct work_struct *work)
|
|
{
|
|
struct pci_pme_device *pme_dev, *n;
|
|
|
|
mutex_lock(&pci_pme_list_mutex);
|
|
list_for_each_entry_safe(pme_dev, n, &pci_pme_list, list) {
|
|
if (pme_dev->dev->pme_poll) {
|
|
struct pci_dev *bridge;
|
|
|
|
bridge = pme_dev->dev->bus->self;
|
|
/*
|
|
* If bridge is in low power state, the
|
|
* configuration space of subordinate devices
|
|
* may be not accessible
|
|
*/
|
|
if (bridge && bridge->current_state != PCI_D0)
|
|
continue;
|
|
pci_pme_wakeup(pme_dev->dev, NULL);
|
|
} else {
|
|
list_del(&pme_dev->list);
|
|
kfree(pme_dev);
|
|
}
|
|
}
|
|
if (!list_empty(&pci_pme_list))
|
|
schedule_delayed_work(&pci_pme_work,
|
|
msecs_to_jiffies(PME_TIMEOUT));
|
|
mutex_unlock(&pci_pme_list_mutex);
|
|
}
|
|
|
|
/**
|
|
* pci_pme_active - enable or disable PCI device's PME# function
|
|
* @dev: PCI device to handle.
|
|
* @enable: 'true' to enable PME# generation; 'false' to disable it.
|
|
*
|
|
* The caller must verify that the device is capable of generating PME# before
|
|
* calling this function with @enable equal to 'true'.
|
|
*/
|
|
void pci_pme_active(struct pci_dev *dev, bool enable)
|
|
{
|
|
u16 pmcsr;
|
|
|
|
if (!dev->pme_support)
|
|
return;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
/* Clear PME_Status by writing 1 to it and enable PME# */
|
|
pmcsr |= PCI_PM_CTRL_PME_STATUS | PCI_PM_CTRL_PME_ENABLE;
|
|
if (!enable)
|
|
pmcsr &= ~PCI_PM_CTRL_PME_ENABLE;
|
|
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, pmcsr);
|
|
|
|
/*
|
|
* PCI (as opposed to PCIe) PME requires that the device have
|
|
* its PME# line hooked up correctly. Not all hardware vendors
|
|
* do this, so the PME never gets delivered and the device
|
|
* remains asleep. The easiest way around this is to
|
|
* periodically walk the list of suspended devices and check
|
|
* whether any have their PME flag set. The assumption is that
|
|
* we'll wake up often enough anyway that this won't be a huge
|
|
* hit, and the power savings from the devices will still be a
|
|
* win.
|
|
*
|
|
* Although PCIe uses in-band PME message instead of PME# line
|
|
* to report PME, PME does not work for some PCIe devices in
|
|
* reality. For example, there are devices that set their PME
|
|
* status bits, but don't really bother to send a PME message;
|
|
* there are PCI Express Root Ports that don't bother to
|
|
* trigger interrupts when they receive PME messages from the
|
|
* devices below. So PME poll is used for PCIe devices too.
|
|
*/
|
|
|
|
if (dev->pme_poll) {
|
|
struct pci_pme_device *pme_dev;
|
|
if (enable) {
|
|
pme_dev = kmalloc(sizeof(struct pci_pme_device),
|
|
GFP_KERNEL);
|
|
if (!pme_dev) {
|
|
dev_warn(&dev->dev, "can't enable PME#\n");
|
|
return;
|
|
}
|
|
pme_dev->dev = dev;
|
|
mutex_lock(&pci_pme_list_mutex);
|
|
list_add(&pme_dev->list, &pci_pme_list);
|
|
if (list_is_singular(&pci_pme_list))
|
|
schedule_delayed_work(&pci_pme_work,
|
|
msecs_to_jiffies(PME_TIMEOUT));
|
|
mutex_unlock(&pci_pme_list_mutex);
|
|
} else {
|
|
mutex_lock(&pci_pme_list_mutex);
|
|
list_for_each_entry(pme_dev, &pci_pme_list, list) {
|
|
if (pme_dev->dev == dev) {
|
|
list_del(&pme_dev->list);
|
|
kfree(pme_dev);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&pci_pme_list_mutex);
|
|
}
|
|
}
|
|
|
|
dev_dbg(&dev->dev, "PME# %s\n", enable ? "enabled" : "disabled");
|
|
}
|
|
EXPORT_SYMBOL(pci_pme_active);
|
|
|
|
/**
|
|
* __pci_enable_wake - enable PCI device as wakeup event source
|
|
* @dev: PCI device affected
|
|
* @state: PCI state from which device will issue wakeup events
|
|
* @runtime: True if the events are to be generated at run time
|
|
* @enable: True to enable event generation; false to disable
|
|
*
|
|
* This enables the device as a wakeup event source, or disables it.
|
|
* When such events involves platform-specific hooks, those hooks are
|
|
* called automatically by this routine.
|
|
*
|
|
* Devices with legacy power management (no standard PCI PM capabilities)
|
|
* always require such platform hooks.
|
|
*
|
|
* RETURN VALUE:
|
|
* 0 is returned on success
|
|
* -EINVAL is returned if device is not supposed to wake up the system
|
|
* Error code depending on the platform is returned if both the platform and
|
|
* the native mechanism fail to enable the generation of wake-up events
|
|
*/
|
|
int __pci_enable_wake(struct pci_dev *dev, pci_power_t state,
|
|
bool runtime, bool enable)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (enable && !runtime && !device_may_wakeup(&dev->dev))
|
|
return -EINVAL;
|
|
|
|
/* Don't do the same thing twice in a row for one device. */
|
|
if (!!enable == !!dev->wakeup_prepared)
|
|
return 0;
|
|
|
|
/*
|
|
* According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
|
|
* Anderson we should be doing PME# wake enable followed by ACPI wake
|
|
* enable. To disable wake-up we call the platform first, for symmetry.
|
|
*/
|
|
|
|
if (enable) {
|
|
int error;
|
|
|
|
if (pci_pme_capable(dev, state))
|
|
pci_pme_active(dev, true);
|
|
else
|
|
ret = 1;
|
|
error = runtime ? platform_pci_run_wake(dev, true) :
|
|
platform_pci_sleep_wake(dev, true);
|
|
if (ret)
|
|
ret = error;
|
|
if (!ret)
|
|
dev->wakeup_prepared = true;
|
|
} else {
|
|
if (runtime)
|
|
platform_pci_run_wake(dev, false);
|
|
else
|
|
platform_pci_sleep_wake(dev, false);
|
|
pci_pme_active(dev, false);
|
|
dev->wakeup_prepared = false;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(__pci_enable_wake);
|
|
|
|
/**
|
|
* pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
|
|
* @dev: PCI device to prepare
|
|
* @enable: True to enable wake-up event generation; false to disable
|
|
*
|
|
* Many drivers want the device to wake up the system from D3_hot or D3_cold
|
|
* and this function allows them to set that up cleanly - pci_enable_wake()
|
|
* should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
|
|
* ordering constraints.
|
|
*
|
|
* This function only returns error code if the device is not capable of
|
|
* generating PME# from both D3_hot and D3_cold, and the platform is unable to
|
|
* enable wake-up power for it.
|
|
*/
|
|
int pci_wake_from_d3(struct pci_dev *dev, bool enable)
|
|
{
|
|
return pci_pme_capable(dev, PCI_D3cold) ?
|
|
pci_enable_wake(dev, PCI_D3cold, enable) :
|
|
pci_enable_wake(dev, PCI_D3hot, enable);
|
|
}
|
|
EXPORT_SYMBOL(pci_wake_from_d3);
|
|
|
|
/**
|
|
* pci_target_state - find an appropriate low power state for a given PCI dev
|
|
* @dev: PCI device
|
|
*
|
|
* Use underlying platform code to find a supported low power state for @dev.
|
|
* If the platform can't manage @dev, return the deepest state from which it
|
|
* can generate wake events, based on any available PME info.
|
|
*/
|
|
static pci_power_t pci_target_state(struct pci_dev *dev)
|
|
{
|
|
pci_power_t target_state = PCI_D3hot;
|
|
|
|
if (platform_pci_power_manageable(dev)) {
|
|
/*
|
|
* Call the platform to choose the target state of the device
|
|
* and enable wake-up from this state if supported.
|
|
*/
|
|
pci_power_t state = platform_pci_choose_state(dev);
|
|
|
|
switch (state) {
|
|
case PCI_POWER_ERROR:
|
|
case PCI_UNKNOWN:
|
|
break;
|
|
case PCI_D1:
|
|
case PCI_D2:
|
|
if (pci_no_d1d2(dev))
|
|
break;
|
|
default:
|
|
target_state = state;
|
|
}
|
|
} else if (!dev->pm_cap) {
|
|
target_state = PCI_D0;
|
|
} else if (device_may_wakeup(&dev->dev)) {
|
|
/*
|
|
* Find the deepest state from which the device can generate
|
|
* wake-up events, make it the target state and enable device
|
|
* to generate PME#.
|
|
*/
|
|
if (dev->pme_support) {
|
|
while (target_state
|
|
&& !(dev->pme_support & (1 << target_state)))
|
|
target_state--;
|
|
}
|
|
}
|
|
|
|
return target_state;
|
|
}
|
|
|
|
/**
|
|
* pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
|
|
* @dev: Device to handle.
|
|
*
|
|
* Choose the power state appropriate for the device depending on whether
|
|
* it can wake up the system and/or is power manageable by the platform
|
|
* (PCI_D3hot is the default) and put the device into that state.
|
|
*/
|
|
int pci_prepare_to_sleep(struct pci_dev *dev)
|
|
{
|
|
pci_power_t target_state = pci_target_state(dev);
|
|
int error;
|
|
|
|
if (target_state == PCI_POWER_ERROR)
|
|
return -EIO;
|
|
|
|
pci_enable_wake(dev, target_state, device_may_wakeup(&dev->dev));
|
|
|
|
error = pci_set_power_state(dev, target_state);
|
|
|
|
if (error)
|
|
pci_enable_wake(dev, target_state, false);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(pci_prepare_to_sleep);
|
|
|
|
/**
|
|
* pci_back_from_sleep - turn PCI device on during system-wide transition into working state
|
|
* @dev: Device to handle.
|
|
*
|
|
* Disable device's system wake-up capability and put it into D0.
|
|
*/
|
|
int pci_back_from_sleep(struct pci_dev *dev)
|
|
{
|
|
pci_enable_wake(dev, PCI_D0, false);
|
|
return pci_set_power_state(dev, PCI_D0);
|
|
}
|
|
EXPORT_SYMBOL(pci_back_from_sleep);
|
|
|
|
/**
|
|
* pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend.
|
|
* @dev: PCI device being suspended.
|
|
*
|
|
* Prepare @dev to generate wake-up events at run time and put it into a low
|
|
* power state.
|
|
*/
|
|
int pci_finish_runtime_suspend(struct pci_dev *dev)
|
|
{
|
|
pci_power_t target_state = pci_target_state(dev);
|
|
int error;
|
|
|
|
if (target_state == PCI_POWER_ERROR)
|
|
return -EIO;
|
|
|
|
dev->runtime_d3cold = target_state == PCI_D3cold;
|
|
|
|
__pci_enable_wake(dev, target_state, true, pci_dev_run_wake(dev));
|
|
|
|
error = pci_set_power_state(dev, target_state);
|
|
|
|
if (error) {
|
|
__pci_enable_wake(dev, target_state, true, false);
|
|
dev->runtime_d3cold = false;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* pci_dev_run_wake - Check if device can generate run-time wake-up events.
|
|
* @dev: Device to check.
|
|
*
|
|
* Return true if the device itself is capable of generating wake-up events
|
|
* (through the platform or using the native PCIe PME) or if the device supports
|
|
* PME and one of its upstream bridges can generate wake-up events.
|
|
*/
|
|
bool pci_dev_run_wake(struct pci_dev *dev)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
|
|
if (device_run_wake(&dev->dev))
|
|
return true;
|
|
|
|
if (!dev->pme_support)
|
|
return false;
|
|
|
|
while (bus->parent) {
|
|
struct pci_dev *bridge = bus->self;
|
|
|
|
if (device_run_wake(&bridge->dev))
|
|
return true;
|
|
|
|
bus = bus->parent;
|
|
}
|
|
|
|
/* We have reached the root bus. */
|
|
if (bus->bridge)
|
|
return device_run_wake(bus->bridge);
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_dev_run_wake);
|
|
|
|
/**
|
|
* pci_dev_keep_suspended - Check if the device can stay in the suspended state.
|
|
* @pci_dev: Device to check.
|
|
*
|
|
* Return 'true' if the device is runtime-suspended, it doesn't have to be
|
|
* reconfigured due to wakeup settings difference between system and runtime
|
|
* suspend and the current power state of it is suitable for the upcoming
|
|
* (system) transition.
|
|
*/
|
|
bool pci_dev_keep_suspended(struct pci_dev *pci_dev)
|
|
{
|
|
struct device *dev = &pci_dev->dev;
|
|
|
|
if (!pm_runtime_suspended(dev)
|
|
|| (device_can_wakeup(dev) && !device_may_wakeup(dev))
|
|
|| platform_pci_need_resume(pci_dev))
|
|
return false;
|
|
|
|
return pci_target_state(pci_dev) == pci_dev->current_state;
|
|
}
|
|
|
|
void pci_config_pm_runtime_get(struct pci_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device *parent = dev->parent;
|
|
|
|
if (parent)
|
|
pm_runtime_get_sync(parent);
|
|
pm_runtime_get_noresume(dev);
|
|
/*
|
|
* pdev->current_state is set to PCI_D3cold during suspending,
|
|
* so wait until suspending completes
|
|
*/
|
|
pm_runtime_barrier(dev);
|
|
/*
|
|
* Only need to resume devices in D3cold, because config
|
|
* registers are still accessible for devices suspended but
|
|
* not in D3cold.
|
|
*/
|
|
if (pdev->current_state == PCI_D3cold)
|
|
pm_runtime_resume(dev);
|
|
}
|
|
|
|
void pci_config_pm_runtime_put(struct pci_dev *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device *parent = dev->parent;
|
|
|
|
pm_runtime_put(dev);
|
|
if (parent)
|
|
pm_runtime_put_sync(parent);
|
|
}
|
|
|
|
/**
|
|
* pci_pm_init - Initialize PM functions of given PCI device
|
|
* @dev: PCI device to handle.
|
|
*/
|
|
void pci_pm_init(struct pci_dev *dev)
|
|
{
|
|
int pm;
|
|
u16 pmc;
|
|
|
|
pm_runtime_forbid(&dev->dev);
|
|
pm_runtime_set_active(&dev->dev);
|
|
pm_runtime_enable(&dev->dev);
|
|
device_enable_async_suspend(&dev->dev);
|
|
dev->wakeup_prepared = false;
|
|
|
|
dev->pm_cap = 0;
|
|
dev->pme_support = 0;
|
|
|
|
/* find PCI PM capability in list */
|
|
pm = pci_find_capability(dev, PCI_CAP_ID_PM);
|
|
if (!pm)
|
|
return;
|
|
/* Check device's ability to generate PME# */
|
|
pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc);
|
|
|
|
if ((pmc & PCI_PM_CAP_VER_MASK) > 3) {
|
|
dev_err(&dev->dev, "unsupported PM cap regs version (%u)\n",
|
|
pmc & PCI_PM_CAP_VER_MASK);
|
|
return;
|
|
}
|
|
|
|
dev->pm_cap = pm;
|
|
dev->d3_delay = PCI_PM_D3_WAIT;
|
|
dev->d3cold_delay = PCI_PM_D3COLD_WAIT;
|
|
dev->d3cold_allowed = true;
|
|
|
|
dev->d1_support = false;
|
|
dev->d2_support = false;
|
|
if (!pci_no_d1d2(dev)) {
|
|
if (pmc & PCI_PM_CAP_D1)
|
|
dev->d1_support = true;
|
|
if (pmc & PCI_PM_CAP_D2)
|
|
dev->d2_support = true;
|
|
|
|
if (dev->d1_support || dev->d2_support)
|
|
dev_printk(KERN_DEBUG, &dev->dev, "supports%s%s\n",
|
|
dev->d1_support ? " D1" : "",
|
|
dev->d2_support ? " D2" : "");
|
|
}
|
|
|
|
pmc &= PCI_PM_CAP_PME_MASK;
|
|
if (pmc) {
|
|
dev_printk(KERN_DEBUG, &dev->dev,
|
|
"PME# supported from%s%s%s%s%s\n",
|
|
(pmc & PCI_PM_CAP_PME_D0) ? " D0" : "",
|
|
(pmc & PCI_PM_CAP_PME_D1) ? " D1" : "",
|
|
(pmc & PCI_PM_CAP_PME_D2) ? " D2" : "",
|
|
(pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "",
|
|
(pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
|
|
dev->pme_support = pmc >> PCI_PM_CAP_PME_SHIFT;
|
|
dev->pme_poll = true;
|
|
/*
|
|
* Make device's PM flags reflect the wake-up capability, but
|
|
* let the user space enable it to wake up the system as needed.
|
|
*/
|
|
device_set_wakeup_capable(&dev->dev, true);
|
|
/* Disable the PME# generation functionality */
|
|
pci_pme_active(dev, false);
|
|
}
|
|
}
|
|
|
|
static void pci_add_saved_cap(struct pci_dev *pci_dev,
|
|
struct pci_cap_saved_state *new_cap)
|
|
{
|
|
hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space);
|
|
}
|
|
|
|
/**
|
|
* _pci_add_cap_save_buffer - allocate buffer for saving given
|
|
* capability registers
|
|
* @dev: the PCI device
|
|
* @cap: the capability to allocate the buffer for
|
|
* @extended: Standard or Extended capability ID
|
|
* @size: requested size of the buffer
|
|
*/
|
|
static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap,
|
|
bool extended, unsigned int size)
|
|
{
|
|
int pos;
|
|
struct pci_cap_saved_state *save_state;
|
|
|
|
if (extended)
|
|
pos = pci_find_ext_capability(dev, cap);
|
|
else
|
|
pos = pci_find_capability(dev, cap);
|
|
|
|
if (!pos)
|
|
return 0;
|
|
|
|
save_state = kzalloc(sizeof(*save_state) + size, GFP_KERNEL);
|
|
if (!save_state)
|
|
return -ENOMEM;
|
|
|
|
save_state->cap.cap_nr = cap;
|
|
save_state->cap.cap_extended = extended;
|
|
save_state->cap.size = size;
|
|
pci_add_saved_cap(dev, save_state);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size)
|
|
{
|
|
return _pci_add_cap_save_buffer(dev, cap, false, size);
|
|
}
|
|
|
|
int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size)
|
|
{
|
|
return _pci_add_cap_save_buffer(dev, cap, true, size);
|
|
}
|
|
|
|
/**
|
|
* pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_allocate_cap_save_buffers(struct pci_dev *dev)
|
|
{
|
|
int error;
|
|
|
|
error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP,
|
|
PCI_EXP_SAVE_REGS * sizeof(u16));
|
|
if (error)
|
|
dev_err(&dev->dev,
|
|
"unable to preallocate PCI Express save buffer\n");
|
|
|
|
error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_PCIX, sizeof(u16));
|
|
if (error)
|
|
dev_err(&dev->dev,
|
|
"unable to preallocate PCI-X save buffer\n");
|
|
|
|
pci_allocate_vc_save_buffers(dev);
|
|
}
|
|
|
|
void pci_free_cap_save_buffers(struct pci_dev *dev)
|
|
{
|
|
struct pci_cap_saved_state *tmp;
|
|
struct hlist_node *n;
|
|
|
|
hlist_for_each_entry_safe(tmp, n, &dev->saved_cap_space, next)
|
|
kfree(tmp);
|
|
}
|
|
|
|
/**
|
|
* pci_configure_ari - enable or disable ARI forwarding
|
|
* @dev: the PCI device
|
|
*
|
|
* If @dev and its upstream bridge both support ARI, enable ARI in the
|
|
* bridge. Otherwise, disable ARI in the bridge.
|
|
*/
|
|
void pci_configure_ari(struct pci_dev *dev)
|
|
{
|
|
u32 cap;
|
|
struct pci_dev *bridge;
|
|
|
|
if (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn)
|
|
return;
|
|
|
|
bridge = dev->bus->self;
|
|
if (!bridge)
|
|
return;
|
|
|
|
pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &cap);
|
|
if (!(cap & PCI_EXP_DEVCAP2_ARI))
|
|
return;
|
|
|
|
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) {
|
|
pcie_capability_set_word(bridge, PCI_EXP_DEVCTL2,
|
|
PCI_EXP_DEVCTL2_ARI);
|
|
bridge->ari_enabled = 1;
|
|
} else {
|
|
pcie_capability_clear_word(bridge, PCI_EXP_DEVCTL2,
|
|
PCI_EXP_DEVCTL2_ARI);
|
|
bridge->ari_enabled = 0;
|
|
}
|
|
}
|
|
|
|
static int pci_acs_enable;
|
|
|
|
/**
|
|
* pci_request_acs - ask for ACS to be enabled if supported
|
|
*/
|
|
void pci_request_acs(void)
|
|
{
|
|
pci_acs_enable = 1;
|
|
}
|
|
|
|
/**
|
|
* pci_std_enable_acs - enable ACS on devices using standard ACS capabilites
|
|
* @dev: the PCI device
|
|
*/
|
|
static int pci_std_enable_acs(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
u16 cap;
|
|
u16 ctrl;
|
|
|
|
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
|
|
if (!pos)
|
|
return -ENODEV;
|
|
|
|
pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap);
|
|
pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
|
|
|
|
/* Source Validation */
|
|
ctrl |= (cap & PCI_ACS_SV);
|
|
|
|
/* P2P Request Redirect */
|
|
ctrl |= (cap & PCI_ACS_RR);
|
|
|
|
/* P2P Completion Redirect */
|
|
ctrl |= (cap & PCI_ACS_CR);
|
|
|
|
/* Upstream Forwarding */
|
|
ctrl |= (cap & PCI_ACS_UF);
|
|
|
|
pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_acs - enable ACS if hardware support it
|
|
* @dev: the PCI device
|
|
*/
|
|
void pci_enable_acs(struct pci_dev *dev)
|
|
{
|
|
if (!pci_acs_enable)
|
|
return;
|
|
|
|
if (!pci_std_enable_acs(dev))
|
|
return;
|
|
|
|
pci_dev_specific_enable_acs(dev);
|
|
}
|
|
|
|
static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags)
|
|
{
|
|
int pos;
|
|
u16 cap, ctrl;
|
|
|
|
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS);
|
|
if (!pos)
|
|
return false;
|
|
|
|
/*
|
|
* Except for egress control, capabilities are either required
|
|
* or only required if controllable. Features missing from the
|
|
* capability field can therefore be assumed as hard-wired enabled.
|
|
*/
|
|
pci_read_config_word(pdev, pos + PCI_ACS_CAP, &cap);
|
|
acs_flags &= (cap | PCI_ACS_EC);
|
|
|
|
pci_read_config_word(pdev, pos + PCI_ACS_CTRL, &ctrl);
|
|
return (ctrl & acs_flags) == acs_flags;
|
|
}
|
|
|
|
/**
|
|
* pci_acs_enabled - test ACS against required flags for a given device
|
|
* @pdev: device to test
|
|
* @acs_flags: required PCI ACS flags
|
|
*
|
|
* Return true if the device supports the provided flags. Automatically
|
|
* filters out flags that are not implemented on multifunction devices.
|
|
*
|
|
* Note that this interface checks the effective ACS capabilities of the
|
|
* device rather than the actual capabilities. For instance, most single
|
|
* function endpoints are not required to support ACS because they have no
|
|
* opportunity for peer-to-peer access. We therefore return 'true'
|
|
* regardless of whether the device exposes an ACS capability. This makes
|
|
* it much easier for callers of this function to ignore the actual type
|
|
* or topology of the device when testing ACS support.
|
|
*/
|
|
bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags)
|
|
{
|
|
int ret;
|
|
|
|
ret = pci_dev_specific_acs_enabled(pdev, acs_flags);
|
|
if (ret >= 0)
|
|
return ret > 0;
|
|
|
|
/*
|
|
* Conventional PCI and PCI-X devices never support ACS, either
|
|
* effectively or actually. The shared bus topology implies that
|
|
* any device on the bus can receive or snoop DMA.
|
|
*/
|
|
if (!pci_is_pcie(pdev))
|
|
return false;
|
|
|
|
switch (pci_pcie_type(pdev)) {
|
|
/*
|
|
* PCI/X-to-PCIe bridges are not specifically mentioned by the spec,
|
|
* but since their primary interface is PCI/X, we conservatively
|
|
* handle them as we would a non-PCIe device.
|
|
*/
|
|
case PCI_EXP_TYPE_PCIE_BRIDGE:
|
|
/*
|
|
* PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never
|
|
* applicable... must never implement an ACS Extended Capability...".
|
|
* This seems arbitrary, but we take a conservative interpretation
|
|
* of this statement.
|
|
*/
|
|
case PCI_EXP_TYPE_PCI_BRIDGE:
|
|
case PCI_EXP_TYPE_RC_EC:
|
|
return false;
|
|
/*
|
|
* PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should
|
|
* implement ACS in order to indicate their peer-to-peer capabilities,
|
|
* regardless of whether they are single- or multi-function devices.
|
|
*/
|
|
case PCI_EXP_TYPE_DOWNSTREAM:
|
|
case PCI_EXP_TYPE_ROOT_PORT:
|
|
return pci_acs_flags_enabled(pdev, acs_flags);
|
|
/*
|
|
* PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be
|
|
* implemented by the remaining PCIe types to indicate peer-to-peer
|
|
* capabilities, but only when they are part of a multifunction
|
|
* device. The footnote for section 6.12 indicates the specific
|
|
* PCIe types included here.
|
|
*/
|
|
case PCI_EXP_TYPE_ENDPOINT:
|
|
case PCI_EXP_TYPE_UPSTREAM:
|
|
case PCI_EXP_TYPE_LEG_END:
|
|
case PCI_EXP_TYPE_RC_END:
|
|
if (!pdev->multifunction)
|
|
break;
|
|
|
|
return pci_acs_flags_enabled(pdev, acs_flags);
|
|
}
|
|
|
|
/*
|
|
* PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable
|
|
* to single function devices with the exception of downstream ports.
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* pci_acs_path_enable - test ACS flags from start to end in a hierarchy
|
|
* @start: starting downstream device
|
|
* @end: ending upstream device or NULL to search to the root bus
|
|
* @acs_flags: required flags
|
|
*
|
|
* Walk up a device tree from start to end testing PCI ACS support. If
|
|
* any step along the way does not support the required flags, return false.
|
|
*/
|
|
bool pci_acs_path_enabled(struct pci_dev *start,
|
|
struct pci_dev *end, u16 acs_flags)
|
|
{
|
|
struct pci_dev *pdev, *parent = start;
|
|
|
|
do {
|
|
pdev = parent;
|
|
|
|
if (!pci_acs_enabled(pdev, acs_flags))
|
|
return false;
|
|
|
|
if (pci_is_root_bus(pdev->bus))
|
|
return (end == NULL);
|
|
|
|
parent = pdev->bus->self;
|
|
} while (pdev != end);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
|
|
* @dev: the PCI device
|
|
* @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD)
|
|
*
|
|
* Perform INTx swizzling for a device behind one level of bridge. This is
|
|
* required by section 9.1 of the PCI-to-PCI bridge specification for devices
|
|
* behind bridges on add-in cards. For devices with ARI enabled, the slot
|
|
* number is always 0 (see the Implementation Note in section 2.2.8.1 of
|
|
* the PCI Express Base Specification, Revision 2.1)
|
|
*/
|
|
u8 pci_swizzle_interrupt_pin(const struct pci_dev *dev, u8 pin)
|
|
{
|
|
int slot;
|
|
|
|
if (pci_ari_enabled(dev->bus))
|
|
slot = 0;
|
|
else
|
|
slot = PCI_SLOT(dev->devfn);
|
|
|
|
return (((pin - 1) + slot) % 4) + 1;
|
|
}
|
|
|
|
int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
|
|
{
|
|
u8 pin;
|
|
|
|
pin = dev->pin;
|
|
if (!pin)
|
|
return -1;
|
|
|
|
while (!pci_is_root_bus(dev->bus)) {
|
|
pin = pci_swizzle_interrupt_pin(dev, pin);
|
|
dev = dev->bus->self;
|
|
}
|
|
*bridge = dev;
|
|
return pin;
|
|
}
|
|
|
|
/**
|
|
* pci_common_swizzle - swizzle INTx all the way to root bridge
|
|
* @dev: the PCI device
|
|
* @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
|
|
*
|
|
* Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
|
|
* bridges all the way up to a PCI root bus.
|
|
*/
|
|
u8 pci_common_swizzle(struct pci_dev *dev, u8 *pinp)
|
|
{
|
|
u8 pin = *pinp;
|
|
|
|
while (!pci_is_root_bus(dev->bus)) {
|
|
pin = pci_swizzle_interrupt_pin(dev, pin);
|
|
dev = dev->bus->self;
|
|
}
|
|
*pinp = pin;
|
|
return PCI_SLOT(dev->devfn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_common_swizzle);
|
|
|
|
/**
|
|
* pci_release_region - Release a PCI bar
|
|
* @pdev: PCI device whose resources were previously reserved by pci_request_region
|
|
* @bar: BAR to release
|
|
*
|
|
* Releases the PCI I/O and memory resources previously reserved by a
|
|
* successful call to pci_request_region. Call this function only
|
|
* after all use of the PCI regions has ceased.
|
|
*/
|
|
void pci_release_region(struct pci_dev *pdev, int bar)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
if (pci_resource_len(pdev, bar) == 0)
|
|
return;
|
|
if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
|
|
release_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar));
|
|
else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
|
|
release_mem_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar));
|
|
|
|
dr = find_pci_dr(pdev);
|
|
if (dr)
|
|
dr->region_mask &= ~(1 << bar);
|
|
}
|
|
EXPORT_SYMBOL(pci_release_region);
|
|
|
|
/**
|
|
* __pci_request_region - Reserved PCI I/O and memory resource
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @bar: BAR to be reserved
|
|
* @res_name: Name to be associated with resource.
|
|
* @exclusive: whether the region access is exclusive or not
|
|
*
|
|
* Mark the PCI region associated with PCI device @pdev BR @bar as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* If @exclusive is set, then the region is marked so that userspace
|
|
* is explicitly not allowed to map the resource via /dev/mem or
|
|
* sysfs MMIO access.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*/
|
|
static int __pci_request_region(struct pci_dev *pdev, int bar,
|
|
const char *res_name, int exclusive)
|
|
{
|
|
struct pci_devres *dr;
|
|
|
|
if (pci_resource_len(pdev, bar) == 0)
|
|
return 0;
|
|
|
|
if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
|
|
if (!request_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar), res_name))
|
|
goto err_out;
|
|
} else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) {
|
|
if (!__request_mem_region(pci_resource_start(pdev, bar),
|
|
pci_resource_len(pdev, bar), res_name,
|
|
exclusive))
|
|
goto err_out;
|
|
}
|
|
|
|
dr = find_pci_dr(pdev);
|
|
if (dr)
|
|
dr->region_mask |= 1 << bar;
|
|
|
|
return 0;
|
|
|
|
err_out:
|
|
dev_warn(&pdev->dev, "BAR %d: can't reserve %pR\n", bar,
|
|
&pdev->resource[bar]);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/**
|
|
* pci_request_region - Reserve PCI I/O and memory resource
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @bar: BAR to be reserved
|
|
* @res_name: Name to be associated with resource
|
|
*
|
|
* Mark the PCI region associated with PCI device @pdev BAR @bar as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*/
|
|
int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
|
|
{
|
|
return __pci_request_region(pdev, bar, res_name, 0);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_region);
|
|
|
|
/**
|
|
* pci_request_region_exclusive - Reserved PCI I/O and memory resource
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @bar: BAR to be reserved
|
|
* @res_name: Name to be associated with resource.
|
|
*
|
|
* Mark the PCI region associated with PCI device @pdev BR @bar as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*
|
|
* The key difference that _exclusive makes it that userspace is
|
|
* explicitly not allowed to map the resource via /dev/mem or
|
|
* sysfs.
|
|
*/
|
|
int pci_request_region_exclusive(struct pci_dev *pdev, int bar,
|
|
const char *res_name)
|
|
{
|
|
return __pci_request_region(pdev, bar, res_name, IORESOURCE_EXCLUSIVE);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_region_exclusive);
|
|
|
|
/**
|
|
* pci_release_selected_regions - Release selected PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources were previously reserved
|
|
* @bars: Bitmask of BARs to be released
|
|
*
|
|
* Release selected PCI I/O and memory resources previously reserved.
|
|
* Call this function only after all use of the PCI regions has ceased.
|
|
*/
|
|
void pci_release_selected_regions(struct pci_dev *pdev, int bars)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 6; i++)
|
|
if (bars & (1 << i))
|
|
pci_release_region(pdev, i);
|
|
}
|
|
EXPORT_SYMBOL(pci_release_selected_regions);
|
|
|
|
static int __pci_request_selected_regions(struct pci_dev *pdev, int bars,
|
|
const char *res_name, int excl)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 6; i++)
|
|
if (bars & (1 << i))
|
|
if (__pci_request_region(pdev, i, res_name, excl))
|
|
goto err_out;
|
|
return 0;
|
|
|
|
err_out:
|
|
while (--i >= 0)
|
|
if (bars & (1 << i))
|
|
pci_release_region(pdev, i);
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
|
|
/**
|
|
* pci_request_selected_regions - Reserve selected PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @bars: Bitmask of BARs to be requested
|
|
* @res_name: Name to be associated with resource
|
|
*/
|
|
int pci_request_selected_regions(struct pci_dev *pdev, int bars,
|
|
const char *res_name)
|
|
{
|
|
return __pci_request_selected_regions(pdev, bars, res_name, 0);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_selected_regions);
|
|
|
|
int pci_request_selected_regions_exclusive(struct pci_dev *pdev, int bars,
|
|
const char *res_name)
|
|
{
|
|
return __pci_request_selected_regions(pdev, bars, res_name,
|
|
IORESOURCE_EXCLUSIVE);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_selected_regions_exclusive);
|
|
|
|
/**
|
|
* pci_release_regions - Release reserved PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources were previously reserved by pci_request_regions
|
|
*
|
|
* Releases all PCI I/O and memory resources previously reserved by a
|
|
* successful call to pci_request_regions. Call this function only
|
|
* after all use of the PCI regions has ceased.
|
|
*/
|
|
|
|
void pci_release_regions(struct pci_dev *pdev)
|
|
{
|
|
pci_release_selected_regions(pdev, (1 << 6) - 1);
|
|
}
|
|
EXPORT_SYMBOL(pci_release_regions);
|
|
|
|
/**
|
|
* pci_request_regions - Reserved PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @res_name: Name to be associated with resource.
|
|
*
|
|
* Mark all PCI regions associated with PCI device @pdev as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*/
|
|
int pci_request_regions(struct pci_dev *pdev, const char *res_name)
|
|
{
|
|
return pci_request_selected_regions(pdev, ((1 << 6) - 1), res_name);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_regions);
|
|
|
|
/**
|
|
* pci_request_regions_exclusive - Reserved PCI I/O and memory resources
|
|
* @pdev: PCI device whose resources are to be reserved
|
|
* @res_name: Name to be associated with resource.
|
|
*
|
|
* Mark all PCI regions associated with PCI device @pdev as
|
|
* being reserved by owner @res_name. Do not access any
|
|
* address inside the PCI regions unless this call returns
|
|
* successfully.
|
|
*
|
|
* pci_request_regions_exclusive() will mark the region so that
|
|
* /dev/mem and the sysfs MMIO access will not be allowed.
|
|
*
|
|
* Returns 0 on success, or %EBUSY on error. A warning
|
|
* message is also printed on failure.
|
|
*/
|
|
int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
|
|
{
|
|
return pci_request_selected_regions_exclusive(pdev,
|
|
((1 << 6) - 1), res_name);
|
|
}
|
|
EXPORT_SYMBOL(pci_request_regions_exclusive);
|
|
|
|
/**
|
|
* pci_remap_iospace - Remap the memory mapped I/O space
|
|
* @res: Resource describing the I/O space
|
|
* @phys_addr: physical address of range to be mapped
|
|
*
|
|
* Remap the memory mapped I/O space described by the @res
|
|
* and the CPU physical address @phys_addr into virtual address space.
|
|
* Only architectures that have memory mapped IO functions defined
|
|
* (and the PCI_IOBASE value defined) should call this function.
|
|
*/
|
|
int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
|
|
{
|
|
#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
|
|
unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
|
|
|
|
if (!(res->flags & IORESOURCE_IO))
|
|
return -EINVAL;
|
|
|
|
if (res->end > IO_SPACE_LIMIT)
|
|
return -EINVAL;
|
|
|
|
return ioremap_page_range(vaddr, vaddr + resource_size(res), phys_addr,
|
|
pgprot_device(PAGE_KERNEL));
|
|
#else
|
|
/* this architecture does not have memory mapped I/O space,
|
|
so this function should never be called */
|
|
WARN_ONCE(1, "This architecture does not support memory mapped I/O\n");
|
|
return -ENODEV;
|
|
#endif
|
|
}
|
|
|
|
static void __pci_set_master(struct pci_dev *dev, bool enable)
|
|
{
|
|
u16 old_cmd, cmd;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &old_cmd);
|
|
if (enable)
|
|
cmd = old_cmd | PCI_COMMAND_MASTER;
|
|
else
|
|
cmd = old_cmd & ~PCI_COMMAND_MASTER;
|
|
if (cmd != old_cmd) {
|
|
dev_dbg(&dev->dev, "%s bus mastering\n",
|
|
enable ? "enabling" : "disabling");
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
dev->is_busmaster = enable;
|
|
}
|
|
|
|
/**
|
|
* pcibios_setup - process "pci=" kernel boot arguments
|
|
* @str: string used to pass in "pci=" kernel boot arguments
|
|
*
|
|
* Process kernel boot arguments. This is the default implementation.
|
|
* Architecture specific implementations can override this as necessary.
|
|
*/
|
|
char * __weak __init pcibios_setup(char *str)
|
|
{
|
|
return str;
|
|
}
|
|
|
|
/**
|
|
* pcibios_set_master - enable PCI bus-mastering for device dev
|
|
* @dev: the PCI device to enable
|
|
*
|
|
* Enables PCI bus-mastering for the device. This is the default
|
|
* implementation. Architecture specific implementations can override
|
|
* this if necessary.
|
|
*/
|
|
void __weak pcibios_set_master(struct pci_dev *dev)
|
|
{
|
|
u8 lat;
|
|
|
|
/* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
|
|
if (pci_is_pcie(dev))
|
|
return;
|
|
|
|
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
|
|
if (lat < 16)
|
|
lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
|
|
else if (lat > pcibios_max_latency)
|
|
lat = pcibios_max_latency;
|
|
else
|
|
return;
|
|
|
|
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
|
|
}
|
|
|
|
/**
|
|
* pci_set_master - enables bus-mastering for device dev
|
|
* @dev: the PCI device to enable
|
|
*
|
|
* Enables bus-mastering on the device and calls pcibios_set_master()
|
|
* to do the needed arch specific settings.
|
|
*/
|
|
void pci_set_master(struct pci_dev *dev)
|
|
{
|
|
__pci_set_master(dev, true);
|
|
pcibios_set_master(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_set_master);
|
|
|
|
/**
|
|
* pci_clear_master - disables bus-mastering for device dev
|
|
* @dev: the PCI device to disable
|
|
*/
|
|
void pci_clear_master(struct pci_dev *dev)
|
|
{
|
|
__pci_set_master(dev, false);
|
|
}
|
|
EXPORT_SYMBOL(pci_clear_master);
|
|
|
|
/**
|
|
* pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
|
|
* @dev: the PCI device for which MWI is to be enabled
|
|
*
|
|
* Helper function for pci_set_mwi.
|
|
* Originally copied from drivers/net/acenic.c.
|
|
* Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int pci_set_cacheline_size(struct pci_dev *dev)
|
|
{
|
|
u8 cacheline_size;
|
|
|
|
if (!pci_cache_line_size)
|
|
return -EINVAL;
|
|
|
|
/* Validate current setting: the PCI_CACHE_LINE_SIZE must be
|
|
equal to or multiple of the right value. */
|
|
pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
|
|
if (cacheline_size >= pci_cache_line_size &&
|
|
(cacheline_size % pci_cache_line_size) == 0)
|
|
return 0;
|
|
|
|
/* Write the correct value. */
|
|
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, pci_cache_line_size);
|
|
/* Read it back. */
|
|
pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &cacheline_size);
|
|
if (cacheline_size == pci_cache_line_size)
|
|
return 0;
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "cache line size of %d is not supported\n",
|
|
pci_cache_line_size << 2);
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_set_cacheline_size);
|
|
|
|
/**
|
|
* pci_set_mwi - enables memory-write-invalidate PCI transaction
|
|
* @dev: the PCI device for which MWI is enabled
|
|
*
|
|
* Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int pci_set_mwi(struct pci_dev *dev)
|
|
{
|
|
#ifdef PCI_DISABLE_MWI
|
|
return 0;
|
|
#else
|
|
int rc;
|
|
u16 cmd;
|
|
|
|
rc = pci_set_cacheline_size(dev);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (!(cmd & PCI_COMMAND_INVALIDATE)) {
|
|
dev_dbg(&dev->dev, "enabling Mem-Wr-Inval\n");
|
|
cmd |= PCI_COMMAND_INVALIDATE;
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
return 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_set_mwi);
|
|
|
|
/**
|
|
* pci_try_set_mwi - enables memory-write-invalidate PCI transaction
|
|
* @dev: the PCI device for which MWI is enabled
|
|
*
|
|
* Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
|
|
* Callers are not required to check the return value.
|
|
*
|
|
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
|
|
*/
|
|
int pci_try_set_mwi(struct pci_dev *dev)
|
|
{
|
|
#ifdef PCI_DISABLE_MWI
|
|
return 0;
|
|
#else
|
|
return pci_set_mwi(dev);
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_try_set_mwi);
|
|
|
|
/**
|
|
* pci_clear_mwi - disables Memory-Write-Invalidate for device dev
|
|
* @dev: the PCI device to disable
|
|
*
|
|
* Disables PCI Memory-Write-Invalidate transaction on the device
|
|
*/
|
|
void pci_clear_mwi(struct pci_dev *dev)
|
|
{
|
|
#ifndef PCI_DISABLE_MWI
|
|
u16 cmd;
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (cmd & PCI_COMMAND_INVALIDATE) {
|
|
cmd &= ~PCI_COMMAND_INVALIDATE;
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL(pci_clear_mwi);
|
|
|
|
/**
|
|
* pci_intx - enables/disables PCI INTx for device dev
|
|
* @pdev: the PCI device to operate on
|
|
* @enable: boolean: whether to enable or disable PCI INTx
|
|
*
|
|
* Enables/disables PCI INTx for device dev
|
|
*/
|
|
void pci_intx(struct pci_dev *pdev, int enable)
|
|
{
|
|
u16 pci_command, new;
|
|
|
|
pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
|
|
|
|
if (enable)
|
|
new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
|
|
else
|
|
new = pci_command | PCI_COMMAND_INTX_DISABLE;
|
|
|
|
if (new != pci_command) {
|
|
struct pci_devres *dr;
|
|
|
|
pci_write_config_word(pdev, PCI_COMMAND, new);
|
|
|
|
dr = find_pci_dr(pdev);
|
|
if (dr && !dr->restore_intx) {
|
|
dr->restore_intx = 1;
|
|
dr->orig_intx = !enable;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_intx);
|
|
|
|
/**
|
|
* pci_intx_mask_supported - probe for INTx masking support
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Check if the device dev support INTx masking via the config space
|
|
* command word.
|
|
*/
|
|
bool pci_intx_mask_supported(struct pci_dev *dev)
|
|
{
|
|
bool mask_supported = false;
|
|
u16 orig, new;
|
|
|
|
if (dev->broken_intx_masking)
|
|
return false;
|
|
|
|
pci_cfg_access_lock(dev);
|
|
|
|
pci_read_config_word(dev, PCI_COMMAND, &orig);
|
|
pci_write_config_word(dev, PCI_COMMAND,
|
|
orig ^ PCI_COMMAND_INTX_DISABLE);
|
|
pci_read_config_word(dev, PCI_COMMAND, &new);
|
|
|
|
/*
|
|
* There's no way to protect against hardware bugs or detect them
|
|
* reliably, but as long as we know what the value should be, let's
|
|
* go ahead and check it.
|
|
*/
|
|
if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) {
|
|
dev_err(&dev->dev, "Command register changed from 0x%x to 0x%x: driver or hardware bug?\n",
|
|
orig, new);
|
|
} else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) {
|
|
mask_supported = true;
|
|
pci_write_config_word(dev, PCI_COMMAND, orig);
|
|
}
|
|
|
|
pci_cfg_access_unlock(dev);
|
|
return mask_supported;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_intx_mask_supported);
|
|
|
|
static bool pci_check_and_set_intx_mask(struct pci_dev *dev, bool mask)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
bool mask_updated = true;
|
|
u32 cmd_status_dword;
|
|
u16 origcmd, newcmd;
|
|
unsigned long flags;
|
|
bool irq_pending;
|
|
|
|
/*
|
|
* We do a single dword read to retrieve both command and status.
|
|
* Document assumptions that make this possible.
|
|
*/
|
|
BUILD_BUG_ON(PCI_COMMAND % 4);
|
|
BUILD_BUG_ON(PCI_COMMAND + 2 != PCI_STATUS);
|
|
|
|
raw_spin_lock_irqsave(&pci_lock, flags);
|
|
|
|
bus->ops->read(bus, dev->devfn, PCI_COMMAND, 4, &cmd_status_dword);
|
|
|
|
irq_pending = (cmd_status_dword >> 16) & PCI_STATUS_INTERRUPT;
|
|
|
|
/*
|
|
* Check interrupt status register to see whether our device
|
|
* triggered the interrupt (when masking) or the next IRQ is
|
|
* already pending (when unmasking).
|
|
*/
|
|
if (mask != irq_pending) {
|
|
mask_updated = false;
|
|
goto done;
|
|
}
|
|
|
|
origcmd = cmd_status_dword;
|
|
newcmd = origcmd & ~PCI_COMMAND_INTX_DISABLE;
|
|
if (mask)
|
|
newcmd |= PCI_COMMAND_INTX_DISABLE;
|
|
if (newcmd != origcmd)
|
|
bus->ops->write(bus, dev->devfn, PCI_COMMAND, 2, newcmd);
|
|
|
|
done:
|
|
raw_spin_unlock_irqrestore(&pci_lock, flags);
|
|
|
|
return mask_updated;
|
|
}
|
|
|
|
/**
|
|
* pci_check_and_mask_intx - mask INTx on pending interrupt
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Check if the device dev has its INTx line asserted, mask it and
|
|
* return true in that case. False is returned if not interrupt was
|
|
* pending.
|
|
*/
|
|
bool pci_check_and_mask_intx(struct pci_dev *dev)
|
|
{
|
|
return pci_check_and_set_intx_mask(dev, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_check_and_mask_intx);
|
|
|
|
/**
|
|
* pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Check if the device dev has its INTx line asserted, unmask it if not
|
|
* and return true. False is returned and the mask remains active if
|
|
* there was still an interrupt pending.
|
|
*/
|
|
bool pci_check_and_unmask_intx(struct pci_dev *dev)
|
|
{
|
|
return pci_check_and_set_intx_mask(dev, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx);
|
|
|
|
int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size)
|
|
{
|
|
return dma_set_max_seg_size(&dev->dev, size);
|
|
}
|
|
EXPORT_SYMBOL(pci_set_dma_max_seg_size);
|
|
|
|
int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask)
|
|
{
|
|
return dma_set_seg_boundary(&dev->dev, mask);
|
|
}
|
|
EXPORT_SYMBOL(pci_set_dma_seg_boundary);
|
|
|
|
/**
|
|
* pci_wait_for_pending_transaction - waits for pending transaction
|
|
* @dev: the PCI device to operate on
|
|
*
|
|
* Return 0 if transaction is pending 1 otherwise.
|
|
*/
|
|
int pci_wait_for_pending_transaction(struct pci_dev *dev)
|
|
{
|
|
if (!pci_is_pcie(dev))
|
|
return 1;
|
|
|
|
return pci_wait_for_pending(dev, pci_pcie_cap(dev) + PCI_EXP_DEVSTA,
|
|
PCI_EXP_DEVSTA_TRPND);
|
|
}
|
|
EXPORT_SYMBOL(pci_wait_for_pending_transaction);
|
|
|
|
static int pcie_flr(struct pci_dev *dev, int probe)
|
|
{
|
|
u32 cap;
|
|
|
|
pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
|
|
if (!(cap & PCI_EXP_DEVCAP_FLR))
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
if (!pci_wait_for_pending_transaction(dev))
|
|
dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n");
|
|
|
|
pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR);
|
|
msleep(100);
|
|
return 0;
|
|
}
|
|
|
|
static int pci_af_flr(struct pci_dev *dev, int probe)
|
|
{
|
|
int pos;
|
|
u8 cap;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_AF);
|
|
if (!pos)
|
|
return -ENOTTY;
|
|
|
|
pci_read_config_byte(dev, pos + PCI_AF_CAP, &cap);
|
|
if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR))
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
/*
|
|
* Wait for Transaction Pending bit to clear. A word-aligned test
|
|
* is used, so we use the conrol offset rather than status and shift
|
|
* the test bit to match.
|
|
*/
|
|
if (!pci_wait_for_pending(dev, pos + PCI_AF_CTRL,
|
|
PCI_AF_STATUS_TP << 8))
|
|
dev_err(&dev->dev, "timed out waiting for pending transaction; performing AF function level reset anyway\n");
|
|
|
|
pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR);
|
|
msleep(100);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_pm_reset - Put device into PCI_D3 and back into PCI_D0.
|
|
* @dev: Device to reset.
|
|
* @probe: If set, only check if the device can be reset this way.
|
|
*
|
|
* If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is
|
|
* unset, it will be reinitialized internally when going from PCI_D3hot to
|
|
* PCI_D0. If that's the case and the device is not in a low-power state
|
|
* already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset.
|
|
*
|
|
* NOTE: This causes the caller to sleep for twice the device power transition
|
|
* cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms
|
|
* by default (i.e. unless the @dev's d3_delay field has a different value).
|
|
* Moreover, only devices in D0 can be reset by this function.
|
|
*/
|
|
static int pci_pm_reset(struct pci_dev *dev, int probe)
|
|
{
|
|
u16 csr;
|
|
|
|
if (!dev->pm_cap || dev->dev_flags & PCI_DEV_FLAGS_NO_PM_RESET)
|
|
return -ENOTTY;
|
|
|
|
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &csr);
|
|
if (csr & PCI_PM_CTRL_NO_SOFT_RESET)
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
if (dev->current_state != PCI_D0)
|
|
return -EINVAL;
|
|
|
|
csr &= ~PCI_PM_CTRL_STATE_MASK;
|
|
csr |= PCI_D3hot;
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr);
|
|
pci_dev_d3_sleep(dev);
|
|
|
|
csr &= ~PCI_PM_CTRL_STATE_MASK;
|
|
csr |= PCI_D0;
|
|
pci_write_config_word(dev, dev->pm_cap + PCI_PM_CTRL, csr);
|
|
pci_dev_d3_sleep(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pci_reset_secondary_bus(struct pci_dev *dev)
|
|
{
|
|
u16 ctrl;
|
|
|
|
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &ctrl);
|
|
ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
|
|
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl);
|
|
/*
|
|
* PCI spec v3.0 7.6.4.2 requires minimum Trst of 1ms. Double
|
|
* this to 2ms to ensure that we meet the minimum requirement.
|
|
*/
|
|
msleep(2);
|
|
|
|
ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
|
|
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, ctrl);
|
|
|
|
/*
|
|
* Trhfa for conventional PCI is 2^25 clock cycles.
|
|
* Assuming a minimum 33MHz clock this results in a 1s
|
|
* delay before we can consider subordinate devices to
|
|
* be re-initialized. PCIe has some ways to shorten this,
|
|
* but we don't make use of them yet.
|
|
*/
|
|
ssleep(1);
|
|
}
|
|
|
|
void __weak pcibios_reset_secondary_bus(struct pci_dev *dev)
|
|
{
|
|
pci_reset_secondary_bus(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge.
|
|
* @dev: Bridge device
|
|
*
|
|
* Use the bridge control register to assert reset on the secondary bus.
|
|
* Devices on the secondary bus are left in power-on state.
|
|
*/
|
|
void pci_reset_bridge_secondary_bus(struct pci_dev *dev)
|
|
{
|
|
pcibios_reset_secondary_bus(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus);
|
|
|
|
static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
|
|
{
|
|
struct pci_dev *pdev;
|
|
|
|
if (pci_is_root_bus(dev->bus) || dev->subordinate ||
|
|
!dev->bus->self || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
|
|
return -ENOTTY;
|
|
|
|
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
|
|
if (pdev != dev)
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
pci_reset_bridge_secondary_bus(dev->bus->self);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
|
|
{
|
|
int rc = -ENOTTY;
|
|
|
|
if (!hotplug || !try_module_get(hotplug->ops->owner))
|
|
return rc;
|
|
|
|
if (hotplug->ops->reset_slot)
|
|
rc = hotplug->ops->reset_slot(hotplug, probe);
|
|
|
|
module_put(hotplug->ops->owner);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
|
|
{
|
|
struct pci_dev *pdev;
|
|
|
|
if (dev->subordinate || !dev->slot ||
|
|
dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
|
|
return -ENOTTY;
|
|
|
|
list_for_each_entry(pdev, &dev->bus->devices, bus_list)
|
|
if (pdev != dev && pdev->slot == dev->slot)
|
|
return -ENOTTY;
|
|
|
|
return pci_reset_hotplug_slot(dev->slot->hotplug, probe);
|
|
}
|
|
|
|
static int __pci_dev_reset(struct pci_dev *dev, int probe)
|
|
{
|
|
int rc;
|
|
|
|
might_sleep();
|
|
|
|
rc = pci_dev_specific_reset(dev, probe);
|
|
if (rc != -ENOTTY)
|
|
goto done;
|
|
|
|
rc = pcie_flr(dev, probe);
|
|
if (rc != -ENOTTY)
|
|
goto done;
|
|
|
|
rc = pci_af_flr(dev, probe);
|
|
if (rc != -ENOTTY)
|
|
goto done;
|
|
|
|
rc = pci_pm_reset(dev, probe);
|
|
if (rc != -ENOTTY)
|
|
goto done;
|
|
|
|
rc = pci_dev_reset_slot_function(dev, probe);
|
|
if (rc != -ENOTTY)
|
|
goto done;
|
|
|
|
rc = pci_parent_bus_reset(dev, probe);
|
|
done:
|
|
return rc;
|
|
}
|
|
|
|
static void pci_dev_lock(struct pci_dev *dev)
|
|
{
|
|
pci_cfg_access_lock(dev);
|
|
/* block PM suspend, driver probe, etc. */
|
|
device_lock(&dev->dev);
|
|
}
|
|
|
|
/* Return 1 on successful lock, 0 on contention */
|
|
static int pci_dev_trylock(struct pci_dev *dev)
|
|
{
|
|
if (pci_cfg_access_trylock(dev)) {
|
|
if (device_trylock(&dev->dev))
|
|
return 1;
|
|
pci_cfg_access_unlock(dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pci_dev_unlock(struct pci_dev *dev)
|
|
{
|
|
device_unlock(&dev->dev);
|
|
pci_cfg_access_unlock(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_reset_notify - notify device driver of reset
|
|
* @dev: device to be notified of reset
|
|
* @prepare: 'true' if device is about to be reset; 'false' if reset attempt
|
|
* completed
|
|
*
|
|
* Must be called prior to device access being disabled and after device
|
|
* access is restored.
|
|
*/
|
|
static void pci_reset_notify(struct pci_dev *dev, bool prepare)
|
|
{
|
|
const struct pci_error_handlers *err_handler =
|
|
dev->driver ? dev->driver->err_handler : NULL;
|
|
if (err_handler && err_handler->reset_notify)
|
|
err_handler->reset_notify(dev, prepare);
|
|
}
|
|
|
|
static void pci_dev_save_and_disable(struct pci_dev *dev)
|
|
{
|
|
pci_reset_notify(dev, true);
|
|
|
|
/*
|
|
* Wake-up device prior to save. PM registers default to D0 after
|
|
* reset and a simple register restore doesn't reliably return
|
|
* to a non-D0 state anyway.
|
|
*/
|
|
pci_set_power_state(dev, PCI_D0);
|
|
|
|
pci_save_state(dev);
|
|
/*
|
|
* Disable the device by clearing the Command register, except for
|
|
* INTx-disable which is set. This not only disables MMIO and I/O port
|
|
* BARs, but also prevents the device from being Bus Master, preventing
|
|
* DMA from the device including MSI/MSI-X interrupts. For PCI 2.3
|
|
* compliant devices, INTx-disable prevents legacy interrupts.
|
|
*/
|
|
pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
|
|
}
|
|
|
|
static void pci_dev_restore(struct pci_dev *dev)
|
|
{
|
|
pci_restore_state(dev);
|
|
pci_reset_notify(dev, false);
|
|
}
|
|
|
|
static int pci_dev_reset(struct pci_dev *dev, int probe)
|
|
{
|
|
int rc;
|
|
|
|
if (!probe)
|
|
pci_dev_lock(dev);
|
|
|
|
rc = __pci_dev_reset(dev, probe);
|
|
|
|
if (!probe)
|
|
pci_dev_unlock(dev);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* __pci_reset_function - reset a PCI device function
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be responsive
|
|
* to PCI config space in order to use this function.
|
|
*
|
|
* The device function is presumed to be unused when this function is called.
|
|
* Resetting the device will make the contents of PCI configuration space
|
|
* random, so any caller of this must be prepared to reinitialise the
|
|
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
|
|
* etc.
|
|
*
|
|
* Returns 0 if the device function was successfully reset or negative if the
|
|
* device doesn't support resetting a single function.
|
|
*/
|
|
int __pci_reset_function(struct pci_dev *dev)
|
|
{
|
|
return pci_dev_reset(dev, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pci_reset_function);
|
|
|
|
/**
|
|
* __pci_reset_function_locked - reset a PCI device function while holding
|
|
* the @dev mutex lock.
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be responsive
|
|
* to PCI config space in order to use this function.
|
|
*
|
|
* The device function is presumed to be unused and the caller is holding
|
|
* the device mutex lock when this function is called.
|
|
* Resetting the device will make the contents of PCI configuration space
|
|
* random, so any caller of this must be prepared to reinitialise the
|
|
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
|
|
* etc.
|
|
*
|
|
* Returns 0 if the device function was successfully reset or negative if the
|
|
* device doesn't support resetting a single function.
|
|
*/
|
|
int __pci_reset_function_locked(struct pci_dev *dev)
|
|
{
|
|
return __pci_dev_reset(dev, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__pci_reset_function_locked);
|
|
|
|
/**
|
|
* pci_probe_reset_function - check whether the device can be safely reset
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be responsive
|
|
* to PCI config space in order to use this function.
|
|
*
|
|
* Returns 0 if the device function can be reset or negative if the
|
|
* device doesn't support resetting a single function.
|
|
*/
|
|
int pci_probe_reset_function(struct pci_dev *dev)
|
|
{
|
|
return pci_dev_reset(dev, 1);
|
|
}
|
|
|
|
/**
|
|
* pci_reset_function - quiesce and reset a PCI device function
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Some devices allow an individual function to be reset without affecting
|
|
* other functions in the same device. The PCI device must be responsive
|
|
* to PCI config space in order to use this function.
|
|
*
|
|
* This function does not just reset the PCI portion of a device, but
|
|
* clears all the state associated with the device. This function differs
|
|
* from __pci_reset_function in that it saves and restores device state
|
|
* over the reset.
|
|
*
|
|
* Returns 0 if the device function was successfully reset or negative if the
|
|
* device doesn't support resetting a single function.
|
|
*/
|
|
int pci_reset_function(struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_dev_reset(dev, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_dev_save_and_disable(dev);
|
|
|
|
rc = pci_dev_reset(dev, 0);
|
|
|
|
pci_dev_restore(dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_reset_function);
|
|
|
|
/**
|
|
* pci_try_reset_function - quiesce and reset a PCI device function
|
|
* @dev: PCI device to reset
|
|
*
|
|
* Same as above, except return -EAGAIN if unable to lock device.
|
|
*/
|
|
int pci_try_reset_function(struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_dev_reset(dev, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_dev_save_and_disable(dev);
|
|
|
|
if (pci_dev_trylock(dev)) {
|
|
rc = __pci_dev_reset(dev, 0);
|
|
pci_dev_unlock(dev);
|
|
} else
|
|
rc = -EAGAIN;
|
|
|
|
pci_dev_restore(dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_try_reset_function);
|
|
|
|
/* Do any devices on or below this bus prevent a bus reset? */
|
|
static bool pci_bus_resetable(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET ||
|
|
(dev->subordinate && !pci_bus_resetable(dev->subordinate)))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Lock devices from the top of the tree down */
|
|
static void pci_bus_lock(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
pci_dev_lock(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_lock(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/* Unlock devices from the bottom of the tree up */
|
|
static void pci_bus_unlock(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
}
|
|
|
|
/* Return 1 on successful lock, 0 on contention */
|
|
static int pci_bus_trylock(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (!pci_dev_trylock(dev))
|
|
goto unlock;
|
|
if (dev->subordinate) {
|
|
if (!pci_bus_trylock(dev->subordinate)) {
|
|
pci_dev_unlock(dev);
|
|
goto unlock;
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
unlock:
|
|
list_for_each_entry_continue_reverse(dev, &bus->devices, bus_list) {
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Do any devices on or below this slot prevent a bus reset? */
|
|
static bool pci_slot_resetable(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET ||
|
|
(dev->subordinate && !pci_bus_resetable(dev->subordinate)))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Lock devices from the top of the tree down */
|
|
static void pci_slot_lock(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
pci_dev_lock(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_lock(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/* Unlock devices from the bottom of the tree up */
|
|
static void pci_slot_unlock(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
}
|
|
|
|
/* Return 1 on successful lock, 0 on contention */
|
|
static int pci_slot_trylock(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (!pci_dev_trylock(dev))
|
|
goto unlock;
|
|
if (dev->subordinate) {
|
|
if (!pci_bus_trylock(dev->subordinate)) {
|
|
pci_dev_unlock(dev);
|
|
goto unlock;
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
|
|
unlock:
|
|
list_for_each_entry_continue_reverse(dev,
|
|
&slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
if (dev->subordinate)
|
|
pci_bus_unlock(dev->subordinate);
|
|
pci_dev_unlock(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Save and disable devices from the top of the tree down */
|
|
static void pci_bus_save_and_disable(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
pci_dev_save_and_disable(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_save_and_disable(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restore devices from top of the tree down - parent bridges need to be
|
|
* restored before we can get to subordinate devices.
|
|
*/
|
|
static void pci_bus_restore(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
pci_dev_restore(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_restore(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/* Save and disable devices from the top of the tree down */
|
|
static void pci_slot_save_and_disable(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
pci_dev_save_and_disable(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_save_and_disable(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restore devices from top of the tree down - parent bridges need to be
|
|
* restored before we can get to subordinate devices.
|
|
*/
|
|
static void pci_slot_restore(struct pci_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &slot->bus->devices, bus_list) {
|
|
if (!dev->slot || dev->slot != slot)
|
|
continue;
|
|
pci_dev_restore(dev);
|
|
if (dev->subordinate)
|
|
pci_bus_restore(dev->subordinate);
|
|
}
|
|
}
|
|
|
|
static int pci_slot_reset(struct pci_slot *slot, int probe)
|
|
{
|
|
int rc;
|
|
|
|
if (!slot || !pci_slot_resetable(slot))
|
|
return -ENOTTY;
|
|
|
|
if (!probe)
|
|
pci_slot_lock(slot);
|
|
|
|
might_sleep();
|
|
|
|
rc = pci_reset_hotplug_slot(slot->hotplug, probe);
|
|
|
|
if (!probe)
|
|
pci_slot_unlock(slot);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* pci_probe_reset_slot - probe whether a PCI slot can be reset
|
|
* @slot: PCI slot to probe
|
|
*
|
|
* Return 0 if slot can be reset, negative if a slot reset is not supported.
|
|
*/
|
|
int pci_probe_reset_slot(struct pci_slot *slot)
|
|
{
|
|
return pci_slot_reset(slot, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_probe_reset_slot);
|
|
|
|
/**
|
|
* pci_reset_slot - reset a PCI slot
|
|
* @slot: PCI slot to reset
|
|
*
|
|
* A PCI bus may host multiple slots, each slot may support a reset mechanism
|
|
* independent of other slots. For instance, some slots may support slot power
|
|
* control. In the case of a 1:1 bus to slot architecture, this function may
|
|
* wrap the bus reset to avoid spurious slot related events such as hotplug.
|
|
* Generally a slot reset should be attempted before a bus reset. All of the
|
|
* function of the slot and any subordinate buses behind the slot are reset
|
|
* through this function. PCI config space of all devices in the slot and
|
|
* behind the slot is saved before and restored after reset.
|
|
*
|
|
* Return 0 on success, non-zero on error.
|
|
*/
|
|
int pci_reset_slot(struct pci_slot *slot)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_slot_reset(slot, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_slot_save_and_disable(slot);
|
|
|
|
rc = pci_slot_reset(slot, 0);
|
|
|
|
pci_slot_restore(slot);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_reset_slot);
|
|
|
|
/**
|
|
* pci_try_reset_slot - Try to reset a PCI slot
|
|
* @slot: PCI slot to reset
|
|
*
|
|
* Same as above except return -EAGAIN if the slot cannot be locked
|
|
*/
|
|
int pci_try_reset_slot(struct pci_slot *slot)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_slot_reset(slot, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_slot_save_and_disable(slot);
|
|
|
|
if (pci_slot_trylock(slot)) {
|
|
might_sleep();
|
|
rc = pci_reset_hotplug_slot(slot->hotplug, 0);
|
|
pci_slot_unlock(slot);
|
|
} else
|
|
rc = -EAGAIN;
|
|
|
|
pci_slot_restore(slot);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_try_reset_slot);
|
|
|
|
static int pci_bus_reset(struct pci_bus *bus, int probe)
|
|
{
|
|
if (!bus->self || !pci_bus_resetable(bus))
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
pci_bus_lock(bus);
|
|
|
|
might_sleep();
|
|
|
|
pci_reset_bridge_secondary_bus(bus->self);
|
|
|
|
pci_bus_unlock(bus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_probe_reset_bus - probe whether a PCI bus can be reset
|
|
* @bus: PCI bus to probe
|
|
*
|
|
* Return 0 if bus can be reset, negative if a bus reset is not supported.
|
|
*/
|
|
int pci_probe_reset_bus(struct pci_bus *bus)
|
|
{
|
|
return pci_bus_reset(bus, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_probe_reset_bus);
|
|
|
|
/**
|
|
* pci_reset_bus - reset a PCI bus
|
|
* @bus: top level PCI bus to reset
|
|
*
|
|
* Do a bus reset on the given bus and any subordinate buses, saving
|
|
* and restoring state of all devices.
|
|
*
|
|
* Return 0 on success, non-zero on error.
|
|
*/
|
|
int pci_reset_bus(struct pci_bus *bus)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_bus_reset(bus, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_bus_save_and_disable(bus);
|
|
|
|
rc = pci_bus_reset(bus, 0);
|
|
|
|
pci_bus_restore(bus);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_reset_bus);
|
|
|
|
/**
|
|
* pci_try_reset_bus - Try to reset a PCI bus
|
|
* @bus: top level PCI bus to reset
|
|
*
|
|
* Same as above except return -EAGAIN if the bus cannot be locked
|
|
*/
|
|
int pci_try_reset_bus(struct pci_bus *bus)
|
|
{
|
|
int rc;
|
|
|
|
rc = pci_bus_reset(bus, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pci_bus_save_and_disable(bus);
|
|
|
|
if (pci_bus_trylock(bus)) {
|
|
might_sleep();
|
|
pci_reset_bridge_secondary_bus(bus->self);
|
|
pci_bus_unlock(bus);
|
|
} else
|
|
rc = -EAGAIN;
|
|
|
|
pci_bus_restore(bus);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_try_reset_bus);
|
|
|
|
/**
|
|
* pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns mmrbc: maximum designed memory read count in bytes
|
|
* or appropriate error value.
|
|
*/
|
|
int pcix_get_max_mmrbc(struct pci_dev *dev)
|
|
{
|
|
int cap;
|
|
u32 stat;
|
|
|
|
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!cap)
|
|
return -EINVAL;
|
|
|
|
if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat))
|
|
return -EINVAL;
|
|
|
|
return 512 << ((stat & PCI_X_STATUS_MAX_READ) >> 21);
|
|
}
|
|
EXPORT_SYMBOL(pcix_get_max_mmrbc);
|
|
|
|
/**
|
|
* pcix_get_mmrbc - get PCI-X maximum memory read byte count
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns mmrbc: maximum memory read count in bytes
|
|
* or appropriate error value.
|
|
*/
|
|
int pcix_get_mmrbc(struct pci_dev *dev)
|
|
{
|
|
int cap;
|
|
u16 cmd;
|
|
|
|
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!cap)
|
|
return -EINVAL;
|
|
|
|
if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd))
|
|
return -EINVAL;
|
|
|
|
return 512 << ((cmd & PCI_X_CMD_MAX_READ) >> 2);
|
|
}
|
|
EXPORT_SYMBOL(pcix_get_mmrbc);
|
|
|
|
/**
|
|
* pcix_set_mmrbc - set PCI-X maximum memory read byte count
|
|
* @dev: PCI device to query
|
|
* @mmrbc: maximum memory read count in bytes
|
|
* valid values are 512, 1024, 2048, 4096
|
|
*
|
|
* If possible sets maximum memory read byte count, some bridges have erratas
|
|
* that prevent this.
|
|
*/
|
|
int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc)
|
|
{
|
|
int cap;
|
|
u32 stat, v, o;
|
|
u16 cmd;
|
|
|
|
if (mmrbc < 512 || mmrbc > 4096 || !is_power_of_2(mmrbc))
|
|
return -EINVAL;
|
|
|
|
v = ffs(mmrbc) - 10;
|
|
|
|
cap = pci_find_capability(dev, PCI_CAP_ID_PCIX);
|
|
if (!cap)
|
|
return -EINVAL;
|
|
|
|
if (pci_read_config_dword(dev, cap + PCI_X_STATUS, &stat))
|
|
return -EINVAL;
|
|
|
|
if (v > (stat & PCI_X_STATUS_MAX_READ) >> 21)
|
|
return -E2BIG;
|
|
|
|
if (pci_read_config_word(dev, cap + PCI_X_CMD, &cmd))
|
|
return -EINVAL;
|
|
|
|
o = (cmd & PCI_X_CMD_MAX_READ) >> 2;
|
|
if (o != v) {
|
|
if (v > o && (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MMRBC))
|
|
return -EIO;
|
|
|
|
cmd &= ~PCI_X_CMD_MAX_READ;
|
|
cmd |= v << 2;
|
|
if (pci_write_config_word(dev, cap + PCI_X_CMD, cmd))
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pcix_set_mmrbc);
|
|
|
|
/**
|
|
* pcie_get_readrq - get PCI Express read request size
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns maximum memory read request in bytes
|
|
* or appropriate error value.
|
|
*/
|
|
int pcie_get_readrq(struct pci_dev *dev)
|
|
{
|
|
u16 ctl;
|
|
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl);
|
|
|
|
return 128 << ((ctl & PCI_EXP_DEVCTL_READRQ) >> 12);
|
|
}
|
|
EXPORT_SYMBOL(pcie_get_readrq);
|
|
|
|
/**
|
|
* pcie_set_readrq - set PCI Express maximum memory read request
|
|
* @dev: PCI device to query
|
|
* @rq: maximum memory read count in bytes
|
|
* valid values are 128, 256, 512, 1024, 2048, 4096
|
|
*
|
|
* If possible sets maximum memory read request in bytes
|
|
*/
|
|
int pcie_set_readrq(struct pci_dev *dev, int rq)
|
|
{
|
|
u16 v;
|
|
|
|
if (rq < 128 || rq > 4096 || !is_power_of_2(rq))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If using the "performance" PCIe config, we clamp the
|
|
* read rq size to the max packet size to prevent the
|
|
* host bridge generating requests larger than we can
|
|
* cope with
|
|
*/
|
|
if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
|
|
int mps = pcie_get_mps(dev);
|
|
|
|
if (mps < rq)
|
|
rq = mps;
|
|
}
|
|
|
|
v = (ffs(rq) - 8) << 12;
|
|
|
|
return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
|
|
PCI_EXP_DEVCTL_READRQ, v);
|
|
}
|
|
EXPORT_SYMBOL(pcie_set_readrq);
|
|
|
|
/**
|
|
* pcie_get_mps - get PCI Express maximum payload size
|
|
* @dev: PCI device to query
|
|
*
|
|
* Returns maximum payload size in bytes
|
|
*/
|
|
int pcie_get_mps(struct pci_dev *dev)
|
|
{
|
|
u16 ctl;
|
|
|
|
pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl);
|
|
|
|
return 128 << ((ctl & PCI_EXP_DEVCTL_PAYLOAD) >> 5);
|
|
}
|
|
EXPORT_SYMBOL(pcie_get_mps);
|
|
|
|
/**
|
|
* pcie_set_mps - set PCI Express maximum payload size
|
|
* @dev: PCI device to query
|
|
* @mps: maximum payload size in bytes
|
|
* valid values are 128, 256, 512, 1024, 2048, 4096
|
|
*
|
|
* If possible sets maximum payload size
|
|
*/
|
|
int pcie_set_mps(struct pci_dev *dev, int mps)
|
|
{
|
|
u16 v;
|
|
|
|
if (mps < 128 || mps > 4096 || !is_power_of_2(mps))
|
|
return -EINVAL;
|
|
|
|
v = ffs(mps) - 8;
|
|
if (v > dev->pcie_mpss)
|
|
return -EINVAL;
|
|
v <<= 5;
|
|
|
|
return pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
|
|
PCI_EXP_DEVCTL_PAYLOAD, v);
|
|
}
|
|
EXPORT_SYMBOL(pcie_set_mps);
|
|
|
|
/**
|
|
* pcie_get_minimum_link - determine minimum link settings of a PCI device
|
|
* @dev: PCI device to query
|
|
* @speed: storage for minimum speed
|
|
* @width: storage for minimum width
|
|
*
|
|
* This function will walk up the PCI device chain and determine the minimum
|
|
* link width and speed of the device.
|
|
*/
|
|
int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed,
|
|
enum pcie_link_width *width)
|
|
{
|
|
int ret;
|
|
|
|
*speed = PCI_SPEED_UNKNOWN;
|
|
*width = PCIE_LNK_WIDTH_UNKNOWN;
|
|
|
|
while (dev) {
|
|
u16 lnksta;
|
|
enum pci_bus_speed next_speed;
|
|
enum pcie_link_width next_width;
|
|
|
|
ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta);
|
|
if (ret)
|
|
return ret;
|
|
|
|
next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS];
|
|
next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >>
|
|
PCI_EXP_LNKSTA_NLW_SHIFT;
|
|
|
|
if (next_speed < *speed)
|
|
*speed = next_speed;
|
|
|
|
if (next_width < *width)
|
|
*width = next_width;
|
|
|
|
dev = dev->bus->self;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pcie_get_minimum_link);
|
|
|
|
/**
|
|
* pci_select_bars - Make BAR mask from the type of resource
|
|
* @dev: the PCI device for which BAR mask is made
|
|
* @flags: resource type mask to be selected
|
|
*
|
|
* This helper routine makes bar mask from the type of resource.
|
|
*/
|
|
int pci_select_bars(struct pci_dev *dev, unsigned long flags)
|
|
{
|
|
int i, bars = 0;
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++)
|
|
if (pci_resource_flags(dev, i) & flags)
|
|
bars |= (1 << i);
|
|
return bars;
|
|
}
|
|
EXPORT_SYMBOL(pci_select_bars);
|
|
|
|
/**
|
|
* pci_resource_bar - get position of the BAR associated with a resource
|
|
* @dev: the PCI device
|
|
* @resno: the resource number
|
|
* @type: the BAR type to be filled in
|
|
*
|
|
* Returns BAR position in config space, or 0 if the BAR is invalid.
|
|
*/
|
|
int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)
|
|
{
|
|
int reg;
|
|
|
|
if (resno < PCI_ROM_RESOURCE) {
|
|
*type = pci_bar_unknown;
|
|
return PCI_BASE_ADDRESS_0 + 4 * resno;
|
|
} else if (resno == PCI_ROM_RESOURCE) {
|
|
*type = pci_bar_mem32;
|
|
return dev->rom_base_reg;
|
|
} else if (resno < PCI_BRIDGE_RESOURCES) {
|
|
/* device specific resource */
|
|
*type = pci_bar_unknown;
|
|
reg = pci_iov_resource_bar(dev, resno);
|
|
if (reg)
|
|
return reg;
|
|
}
|
|
|
|
dev_err(&dev->dev, "BAR %d: invalid resource\n", resno);
|
|
return 0;
|
|
}
|
|
|
|
/* Some architectures require additional programming to enable VGA */
|
|
static arch_set_vga_state_t arch_set_vga_state;
|
|
|
|
void __init pci_register_set_vga_state(arch_set_vga_state_t func)
|
|
{
|
|
arch_set_vga_state = func; /* NULL disables */
|
|
}
|
|
|
|
static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode,
|
|
unsigned int command_bits, u32 flags)
|
|
{
|
|
if (arch_set_vga_state)
|
|
return arch_set_vga_state(dev, decode, command_bits,
|
|
flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_set_vga_state - set VGA decode state on device and parents if requested
|
|
* @dev: the PCI device
|
|
* @decode: true = enable decoding, false = disable decoding
|
|
* @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
|
|
* @flags: traverse ancestors and change bridges
|
|
* CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
|
|
*/
|
|
int pci_set_vga_state(struct pci_dev *dev, bool decode,
|
|
unsigned int command_bits, u32 flags)
|
|
{
|
|
struct pci_bus *bus;
|
|
struct pci_dev *bridge;
|
|
u16 cmd;
|
|
int rc;
|
|
|
|
WARN_ON((flags & PCI_VGA_STATE_CHANGE_DECODES) && (command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY)));
|
|
|
|
/* ARCH specific VGA enables */
|
|
rc = pci_set_vga_state_arch(dev, decode, command_bits, flags);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (flags & PCI_VGA_STATE_CHANGE_DECODES) {
|
|
pci_read_config_word(dev, PCI_COMMAND, &cmd);
|
|
if (decode == true)
|
|
cmd |= command_bits;
|
|
else
|
|
cmd &= ~command_bits;
|
|
pci_write_config_word(dev, PCI_COMMAND, cmd);
|
|
}
|
|
|
|
if (!(flags & PCI_VGA_STATE_CHANGE_BRIDGE))
|
|
return 0;
|
|
|
|
bus = dev->bus;
|
|
while (bus) {
|
|
bridge = bus->self;
|
|
if (bridge) {
|
|
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
|
|
&cmd);
|
|
if (decode == true)
|
|
cmd |= PCI_BRIDGE_CTL_VGA;
|
|
else
|
|
cmd &= ~PCI_BRIDGE_CTL_VGA;
|
|
pci_write_config_word(bridge, PCI_BRIDGE_CONTROL,
|
|
cmd);
|
|
}
|
|
bus = bus->parent;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
bool pci_device_is_present(struct pci_dev *pdev)
|
|
{
|
|
u32 v;
|
|
|
|
return pci_bus_read_dev_vendor_id(pdev->bus, pdev->devfn, &v, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_device_is_present);
|
|
|
|
void pci_ignore_hotplug(struct pci_dev *dev)
|
|
{
|
|
struct pci_dev *bridge = dev->bus->self;
|
|
|
|
dev->ignore_hotplug = 1;
|
|
/* Propagate the "ignore hotplug" setting to the parent bridge. */
|
|
if (bridge)
|
|
bridge->ignore_hotplug = 1;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_ignore_hotplug);
|
|
|
|
#define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
|
|
static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
|
|
static DEFINE_SPINLOCK(resource_alignment_lock);
|
|
|
|
/**
|
|
* pci_specified_resource_alignment - get resource alignment specified by user.
|
|
* @dev: the PCI device to get
|
|
*
|
|
* RETURNS: Resource alignment if it is specified.
|
|
* Zero if it is not specified.
|
|
*/
|
|
static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev)
|
|
{
|
|
int seg, bus, slot, func, align_order, count;
|
|
resource_size_t align = 0;
|
|
char *p;
|
|
|
|
spin_lock(&resource_alignment_lock);
|
|
p = resource_alignment_param;
|
|
while (*p) {
|
|
count = 0;
|
|
if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
|
|
p[count] == '@') {
|
|
p += count + 1;
|
|
} else {
|
|
align_order = -1;
|
|
}
|
|
if (sscanf(p, "%x:%x:%x.%x%n",
|
|
&seg, &bus, &slot, &func, &count) != 4) {
|
|
seg = 0;
|
|
if (sscanf(p, "%x:%x.%x%n",
|
|
&bus, &slot, &func, &count) != 3) {
|
|
/* Invalid format */
|
|
printk(KERN_ERR "PCI: Can't parse resource_alignment parameter: %s\n",
|
|
p);
|
|
break;
|
|
}
|
|
}
|
|
p += count;
|
|
if (seg == pci_domain_nr(dev->bus) &&
|
|
bus == dev->bus->number &&
|
|
slot == PCI_SLOT(dev->devfn) &&
|
|
func == PCI_FUNC(dev->devfn)) {
|
|
if (align_order == -1)
|
|
align = PAGE_SIZE;
|
|
else
|
|
align = 1 << align_order;
|
|
/* Found */
|
|
break;
|
|
}
|
|
if (*p != ';' && *p != ',') {
|
|
/* End of param or invalid format */
|
|
break;
|
|
}
|
|
p++;
|
|
}
|
|
spin_unlock(&resource_alignment_lock);
|
|
return align;
|
|
}
|
|
|
|
/*
|
|
* This function disables memory decoding and releases memory resources
|
|
* of the device specified by kernel's boot parameter 'pci=resource_alignment='.
|
|
* It also rounds up size to specified alignment.
|
|
* Later on, the kernel will assign page-aligned memory resource back
|
|
* to the device.
|
|
*/
|
|
void pci_reassigndev_resource_alignment(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
struct resource *r;
|
|
resource_size_t align, size;
|
|
u16 command;
|
|
|
|
/* check if specified PCI is target device to reassign */
|
|
align = pci_specified_resource_alignment(dev);
|
|
if (!align)
|
|
return;
|
|
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL &&
|
|
(dev->class >> 8) == PCI_CLASS_BRIDGE_HOST) {
|
|
dev_warn(&dev->dev,
|
|
"Can't reassign resources to host bridge.\n");
|
|
return;
|
|
}
|
|
|
|
dev_info(&dev->dev,
|
|
"Disabling memory decoding and releasing memory resources.\n");
|
|
pci_read_config_word(dev, PCI_COMMAND, &command);
|
|
command &= ~PCI_COMMAND_MEMORY;
|
|
pci_write_config_word(dev, PCI_COMMAND, command);
|
|
|
|
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
|
|
r = &dev->resource[i];
|
|
if (!(r->flags & IORESOURCE_MEM))
|
|
continue;
|
|
size = resource_size(r);
|
|
if (size < align) {
|
|
size = align;
|
|
dev_info(&dev->dev,
|
|
"Rounding up size of resource #%d to %#llx.\n",
|
|
i, (unsigned long long)size);
|
|
}
|
|
r->flags |= IORESOURCE_UNSET;
|
|
r->end = size - 1;
|
|
r->start = 0;
|
|
}
|
|
/* Need to disable bridge's resource window,
|
|
* to enable the kernel to reassign new resource
|
|
* window later on.
|
|
*/
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
|
|
(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
|
|
for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
|
|
r = &dev->resource[i];
|
|
if (!(r->flags & IORESOURCE_MEM))
|
|
continue;
|
|
r->flags |= IORESOURCE_UNSET;
|
|
r->end = resource_size(r) - 1;
|
|
r->start = 0;
|
|
}
|
|
pci_disable_bridge_window(dev);
|
|
}
|
|
}
|
|
|
|
static ssize_t pci_set_resource_alignment_param(const char *buf, size_t count)
|
|
{
|
|
if (count > RESOURCE_ALIGNMENT_PARAM_SIZE - 1)
|
|
count = RESOURCE_ALIGNMENT_PARAM_SIZE - 1;
|
|
spin_lock(&resource_alignment_lock);
|
|
strncpy(resource_alignment_param, buf, count);
|
|
resource_alignment_param[count] = '\0';
|
|
spin_unlock(&resource_alignment_lock);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t pci_get_resource_alignment_param(char *buf, size_t size)
|
|
{
|
|
size_t count;
|
|
spin_lock(&resource_alignment_lock);
|
|
count = snprintf(buf, size, "%s", resource_alignment_param);
|
|
spin_unlock(&resource_alignment_lock);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t pci_resource_alignment_show(struct bus_type *bus, char *buf)
|
|
{
|
|
return pci_get_resource_alignment_param(buf, PAGE_SIZE);
|
|
}
|
|
|
|
static ssize_t pci_resource_alignment_store(struct bus_type *bus,
|
|
const char *buf, size_t count)
|
|
{
|
|
return pci_set_resource_alignment_param(buf, count);
|
|
}
|
|
|
|
BUS_ATTR(resource_alignment, 0644, pci_resource_alignment_show,
|
|
pci_resource_alignment_store);
|
|
|
|
static int __init pci_resource_alignment_sysfs_init(void)
|
|
{
|
|
return bus_create_file(&pci_bus_type,
|
|
&bus_attr_resource_alignment);
|
|
}
|
|
late_initcall(pci_resource_alignment_sysfs_init);
|
|
|
|
static void pci_no_domains(void)
|
|
{
|
|
#ifdef CONFIG_PCI_DOMAINS
|
|
pci_domains_supported = 0;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_PCI_DOMAINS
|
|
static atomic_t __domain_nr = ATOMIC_INIT(-1);
|
|
|
|
int pci_get_new_domain_nr(void)
|
|
{
|
|
return atomic_inc_return(&__domain_nr);
|
|
}
|
|
|
|
#ifdef CONFIG_PCI_DOMAINS_GENERIC
|
|
void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
|
|
{
|
|
static int use_dt_domains = -1;
|
|
int domain = of_get_pci_domain_nr(parent->of_node);
|
|
|
|
/*
|
|
* Check DT domain and use_dt_domains values.
|
|
*
|
|
* If DT domain property is valid (domain >= 0) and
|
|
* use_dt_domains != 0, the DT assignment is valid since this means
|
|
* we have not previously allocated a domain number by using
|
|
* pci_get_new_domain_nr(); we should also update use_dt_domains to
|
|
* 1, to indicate that we have just assigned a domain number from
|
|
* DT.
|
|
*
|
|
* If DT domain property value is not valid (ie domain < 0), and we
|
|
* have not previously assigned a domain number from DT
|
|
* (use_dt_domains != 1) we should assign a domain number by
|
|
* using the:
|
|
*
|
|
* pci_get_new_domain_nr()
|
|
*
|
|
* API and update the use_dt_domains value to keep track of method we
|
|
* are using to assign domain numbers (use_dt_domains = 0).
|
|
*
|
|
* All other combinations imply we have a platform that is trying
|
|
* to mix domain numbers obtained from DT and pci_get_new_domain_nr(),
|
|
* which is a recipe for domain mishandling and it is prevented by
|
|
* invalidating the domain value (domain = -1) and printing a
|
|
* corresponding error.
|
|
*/
|
|
if (domain >= 0 && use_dt_domains) {
|
|
use_dt_domains = 1;
|
|
} else if (domain < 0 && use_dt_domains != 1) {
|
|
use_dt_domains = 0;
|
|
domain = pci_get_new_domain_nr();
|
|
} else {
|
|
dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
|
|
parent->of_node->full_name);
|
|
domain = -1;
|
|
}
|
|
|
|
bus->domain_nr = domain;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
/**
|
|
* pci_ext_cfg_avail - can we access extended PCI config space?
|
|
*
|
|
* Returns 1 if we can access PCI extended config space (offsets
|
|
* greater than 0xff). This is the default implementation. Architecture
|
|
* implementations can override this.
|
|
*/
|
|
int __weak pci_ext_cfg_avail(void)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
void __weak pci_fixup_cardbus(struct pci_bus *bus)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL(pci_fixup_cardbus);
|
|
|
|
static int __init pci_setup(char *str)
|
|
{
|
|
while (str) {
|
|
char *k = strchr(str, ',');
|
|
if (k)
|
|
*k++ = 0;
|
|
if (*str && (str = pcibios_setup(str)) && *str) {
|
|
if (!strcmp(str, "nomsi")) {
|
|
pci_no_msi();
|
|
} else if (!strcmp(str, "noaer")) {
|
|
pci_no_aer();
|
|
} else if (!strncmp(str, "realloc=", 8)) {
|
|
pci_realloc_get_opt(str + 8);
|
|
} else if (!strncmp(str, "realloc", 7)) {
|
|
pci_realloc_get_opt("on");
|
|
} else if (!strcmp(str, "nodomains")) {
|
|
pci_no_domains();
|
|
} else if (!strncmp(str, "noari", 5)) {
|
|
pcie_ari_disabled = true;
|
|
} else if (!strncmp(str, "cbiosize=", 9)) {
|
|
pci_cardbus_io_size = memparse(str + 9, &str);
|
|
} else if (!strncmp(str, "cbmemsize=", 10)) {
|
|
pci_cardbus_mem_size = memparse(str + 10, &str);
|
|
} else if (!strncmp(str, "resource_alignment=", 19)) {
|
|
pci_set_resource_alignment_param(str + 19,
|
|
strlen(str + 19));
|
|
} else if (!strncmp(str, "ecrc=", 5)) {
|
|
pcie_ecrc_get_policy(str + 5);
|
|
} else if (!strncmp(str, "hpiosize=", 9)) {
|
|
pci_hotplug_io_size = memparse(str + 9, &str);
|
|
} else if (!strncmp(str, "hpmemsize=", 10)) {
|
|
pci_hotplug_mem_size = memparse(str + 10, &str);
|
|
} else if (!strncmp(str, "pcie_bus_tune_off", 17)) {
|
|
pcie_bus_config = PCIE_BUS_TUNE_OFF;
|
|
} else if (!strncmp(str, "pcie_bus_safe", 13)) {
|
|
pcie_bus_config = PCIE_BUS_SAFE;
|
|
} else if (!strncmp(str, "pcie_bus_perf", 13)) {
|
|
pcie_bus_config = PCIE_BUS_PERFORMANCE;
|
|
} else if (!strncmp(str, "pcie_bus_peer2peer", 18)) {
|
|
pcie_bus_config = PCIE_BUS_PEER2PEER;
|
|
} else if (!strncmp(str, "pcie_scan_all", 13)) {
|
|
pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS);
|
|
} else {
|
|
printk(KERN_ERR "PCI: Unknown option `%s'\n",
|
|
str);
|
|
}
|
|
}
|
|
str = k;
|
|
}
|
|
return 0;
|
|
}
|
|
early_param("pci", pci_setup);
|