mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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be6d2867b4
Commit 668192b678
"PCI: acpiphp: Move host bridge hotplug
to pci_root.c" has moved PCI host bridge hotplug logic from acpiphp
to pci_root, but there is still PCI host bridge hotplug related
dead code left in acpiphp. So remove those dead code.
Now companion ACPI devices are always created before corresponding
PCI devices. And the ACPI event handle_hotplug_event_bridge() will be
installed only if it has associated PCI device. So remove dead code to
handle bridge hot-adding in function handle_hotplug_event_bridge().
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
1413 lines
34 KiB
C
1413 lines
34 KiB
C
/*
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* ACPI PCI HotPlug glue functions to ACPI CA subsystem
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*
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* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
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* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
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* Copyright (C) 2002,2003 NEC Corporation
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* Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
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* Copyright (C) 2003-2005 Hewlett Packard
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* Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
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* Copyright (C) 2005 Intel Corporation
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <kristen.c.accardi@intel.com>
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*
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*/
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/*
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* Lifetime rules for pci_dev:
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* - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
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* when the bridge is scanned and it loses a refcount when the bridge
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* is removed.
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* - When a P2P bridge is present, we elevate the refcount on the subordinate
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* bus. It loses the refcount when the the driver unloads.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/pci-acpi.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include "../pci.h"
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#include "acpiphp.h"
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static LIST_HEAD(bridge_list);
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#define MY_NAME "acpiphp_glue"
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static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
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static void acpiphp_sanitize_bus(struct pci_bus *bus);
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static void acpiphp_set_hpp_values(struct pci_bus *bus);
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static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
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/* callback routine to check for the existence of a pci dock device */
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static acpi_status
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is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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int *count = (int *)context;
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if (is_dock_device(handle)) {
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(*count)++;
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return AE_CTRL_TERMINATE;
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} else {
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return AE_OK;
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}
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}
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/*
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* the _DCK method can do funny things... and sometimes not
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* hah-hah funny.
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*
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* TBD - figure out a way to only call fixups for
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* systems that require them.
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*/
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static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
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void *v)
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{
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struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
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struct pci_bus *bus = func->slot->bridge->pci_bus;
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u32 buses;
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if (!bus->self)
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return NOTIFY_OK;
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/* fixup bad _DCK function that rewrites
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* secondary bridge on slot
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*/
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pci_read_config_dword(bus->self,
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PCI_PRIMARY_BUS,
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&buses);
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if (((buses >> 8) & 0xff) != bus->busn_res.start) {
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buses = (buses & 0xff000000)
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| ((unsigned int)(bus->primary) << 0)
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| ((unsigned int)(bus->busn_res.start) << 8)
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| ((unsigned int)(bus->busn_res.end) << 16);
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pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
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}
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return NOTIFY_OK;
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}
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static const struct acpi_dock_ops acpiphp_dock_ops = {
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.handler = handle_hotplug_event_func,
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};
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/* Check whether the PCI device is managed by native PCIe hotplug driver */
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static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
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{
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u32 reg32;
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acpi_handle tmp;
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struct acpi_pci_root *root;
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/* Check whether the PCIe port supports native PCIe hotplug */
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if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
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return false;
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if (!(reg32 & PCI_EXP_SLTCAP_HPC))
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return false;
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/*
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* Check whether native PCIe hotplug has been enabled for
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* this PCIe hierarchy.
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*/
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tmp = acpi_find_root_bridge_handle(pdev);
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if (!tmp)
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return false;
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root = acpi_pci_find_root(tmp);
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if (!root)
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return false;
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if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
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return false;
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return true;
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}
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/* callback routine to register each ACPI PCI slot object */
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static acpi_status
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register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
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struct acpiphp_slot *slot;
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struct acpiphp_func *newfunc;
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acpi_handle tmp;
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acpi_status status = AE_OK;
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unsigned long long adr, sun;
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int device, function, retval;
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struct pci_bus *pbus = bridge->pci_bus;
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struct pci_dev *pdev;
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if (!acpi_pci_check_ejectable(pbus, handle) && !is_dock_device(handle))
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return AE_OK;
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status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
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if (ACPI_FAILURE(status)) {
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warn("can't evaluate _ADR (%#x)\n", status);
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return AE_OK;
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}
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device = (adr >> 16) & 0xffff;
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function = adr & 0xffff;
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pdev = pbus->self;
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if (pdev && device_is_managed_by_native_pciehp(pdev))
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return AE_OK;
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newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
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if (!newfunc)
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return AE_NO_MEMORY;
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INIT_LIST_HEAD(&newfunc->sibling);
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newfunc->handle = handle;
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newfunc->function = function;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
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newfunc->flags = FUNC_HAS_EJ0;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
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newfunc->flags |= FUNC_HAS_STA;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
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newfunc->flags |= FUNC_HAS_PS0;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
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newfunc->flags |= FUNC_HAS_PS3;
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if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
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newfunc->flags |= FUNC_HAS_DCK;
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status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
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if (ACPI_FAILURE(status)) {
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/*
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* use the count of the number of slots we've found
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* for the number of the slot
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*/
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sun = bridge->nr_slots+1;
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}
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/* search for objects that share the same slot */
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for (slot = bridge->slots; slot; slot = slot->next)
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if (slot->device == device) {
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if (slot->sun != sun)
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warn("sibling found, but _SUN doesn't match!\n");
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break;
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}
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if (!slot) {
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slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
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if (!slot) {
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kfree(newfunc);
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return AE_NO_MEMORY;
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}
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slot->bridge = bridge;
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slot->device = device;
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slot->sun = sun;
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INIT_LIST_HEAD(&slot->funcs);
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mutex_init(&slot->crit_sect);
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slot->next = bridge->slots;
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bridge->slots = slot;
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bridge->nr_slots++;
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dbg("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
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slot->sun, pci_domain_nr(pbus), pbus->number, device);
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retval = acpiphp_register_hotplug_slot(slot);
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if (retval) {
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if (retval == -EBUSY)
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warn("Slot %llu already registered by another "
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"hotplug driver\n", slot->sun);
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else
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warn("acpiphp_register_hotplug_slot failed "
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"(err code = 0x%x)\n", retval);
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goto err_exit;
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}
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}
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newfunc->slot = slot;
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list_add_tail(&newfunc->sibling, &slot->funcs);
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pdev = pci_get_slot(pbus, PCI_DEVFN(device, function));
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if (pdev) {
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slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
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pci_dev_put(pdev);
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}
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if (is_dock_device(handle)) {
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/* we don't want to call this device's _EJ0
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* because we want the dock notify handler
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* to call it after it calls _DCK
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*/
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newfunc->flags &= ~FUNC_HAS_EJ0;
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if (register_hotplug_dock_device(handle,
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&acpiphp_dock_ops, newfunc))
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dbg("failed to register dock device\n");
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/* we need to be notified when dock events happen
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* outside of the hotplug operation, since we may
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* need to do fixups before we can hotplug.
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*/
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newfunc->nb.notifier_call = post_dock_fixups;
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if (register_dock_notifier(&newfunc->nb))
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dbg("failed to register a dock notifier");
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}
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/* install notify handler */
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if (!(newfunc->flags & FUNC_HAS_DCK)) {
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status = acpi_install_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event_func,
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newfunc);
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if (ACPI_FAILURE(status))
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err("failed to register interrupt notify handler\n");
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} else
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status = AE_OK;
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return status;
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err_exit:
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bridge->nr_slots--;
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bridge->slots = slot->next;
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kfree(slot);
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kfree(newfunc);
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return AE_OK;
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}
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/* see if it's worth looking at this bridge */
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static int detect_ejectable_slots(acpi_handle handle)
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{
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int found = acpi_pci_detect_ejectable(handle);
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if (!found) {
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acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
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is_pci_dock_device, NULL, (void *)&found, NULL);
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}
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return found;
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}
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/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
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static void init_bridge_misc(struct acpiphp_bridge *bridge)
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{
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acpi_status status;
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/* must be added to the list prior to calling register_slot */
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list_add(&bridge->list, &bridge_list);
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/* register all slot objects under this bridge */
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
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register_slot, NULL, bridge, NULL);
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if (ACPI_FAILURE(status)) {
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list_del(&bridge->list);
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return;
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}
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/* install notify handler for P2P bridges */
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if (!pci_is_root_bus(bridge->pci_bus)) {
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if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
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status = acpi_remove_notify_handler(bridge->func->handle,
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ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event_func);
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if (ACPI_FAILURE(status))
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err("failed to remove notify handler\n");
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}
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status = acpi_install_notify_handler(bridge->handle,
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ACPI_SYSTEM_NOTIFY,
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handle_hotplug_event_bridge,
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bridge);
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if (ACPI_FAILURE(status)) {
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err("failed to register interrupt notify handler\n");
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}
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}
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}
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|
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/* find acpiphp_func from acpiphp_bridge */
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static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
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{
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struct acpiphp_bridge *bridge;
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struct acpiphp_slot *slot;
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struct acpiphp_func *func;
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list_for_each_entry(bridge, &bridge_list, list) {
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for (slot = bridge->slots; slot; slot = slot->next) {
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list_for_each_entry(func, &slot->funcs, sibling) {
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if (func->handle == handle)
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return func;
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}
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}
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}
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return NULL;
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}
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|
|
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static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
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{
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acpi_handle dummy_handle;
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struct acpiphp_func *func;
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if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
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"_EJ0", &dummy_handle))) {
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bridge->flags |= BRIDGE_HAS_EJ0;
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dbg("found ejectable p2p bridge\n");
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/* make link between PCI bridge and PCI function */
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func = acpiphp_bridge_handle_to_function(bridge->handle);
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if (!func)
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return;
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bridge->func = func;
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func->bridge = bridge;
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}
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}
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|
|
|
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/* allocate and initialize host bridge data structure */
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static void add_host_bridge(struct acpi_pci_root *root)
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{
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struct acpiphp_bridge *bridge;
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acpi_handle handle = root->device->handle;
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bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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if (bridge == NULL)
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return;
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|
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bridge->handle = handle;
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|
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bridge->pci_bus = root->bus;
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|
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init_bridge_misc(bridge);
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}
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|
|
|
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/* allocate and initialize PCI-to-PCI bridge data structure */
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static void add_p2p_bridge(acpi_handle *handle)
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{
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struct acpiphp_bridge *bridge;
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bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
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if (bridge == NULL) {
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err("out of memory\n");
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return;
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}
|
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|
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bridge->handle = handle;
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config_p2p_bridge_flags(bridge);
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|
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bridge->pci_dev = acpi_get_pci_dev(handle);
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bridge->pci_bus = bridge->pci_dev->subordinate;
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if (!bridge->pci_bus) {
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err("This is not a PCI-to-PCI bridge!\n");
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goto err;
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}
|
|
|
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/*
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* Grab a ref to the subordinate PCI bus in case the bus is
|
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* removed via PCI core logical hotplug. The ref pins the bus
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* (which we access during module unload).
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*/
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get_device(&bridge->pci_bus->dev);
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|
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init_bridge_misc(bridge);
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return;
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err:
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pci_dev_put(bridge->pci_dev);
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kfree(bridge);
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return;
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}
|
|
|
|
|
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/* callback routine to find P2P bridges */
|
|
static acpi_status
|
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find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
|
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{
|
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acpi_status status;
|
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struct pci_dev *dev;
|
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|
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dev = acpi_get_pci_dev(handle);
|
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if (!dev || !dev->subordinate)
|
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goto out;
|
|
|
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/* check if this bridge has ejectable slots */
|
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if ((detect_ejectable_slots(handle) > 0)) {
|
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dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
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add_p2p_bridge(handle);
|
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}
|
|
|
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/* search P2P bridges under this p2p bridge */
|
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
|
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find_p2p_bridge, NULL, NULL, NULL);
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if (ACPI_FAILURE(status))
|
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warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
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|
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out:
|
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pci_dev_put(dev);
|
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return AE_OK;
|
|
}
|
|
|
|
|
|
/* find hot-pluggable slots, and then find P2P bridge */
|
|
static int add_bridge(struct acpi_pci_root *root)
|
|
{
|
|
acpi_status status;
|
|
unsigned long long tmp;
|
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acpi_handle dummy_handle;
|
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acpi_handle handle = root->device->handle;
|
|
|
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/* if the bridge doesn't have _STA, we assume it is always there */
|
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status = acpi_get_handle(handle, "_STA", &dummy_handle);
|
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if (ACPI_SUCCESS(status)) {
|
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status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
|
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if (ACPI_FAILURE(status)) {
|
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dbg("%s: _STA evaluation failure\n", __func__);
|
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return 0;
|
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}
|
|
if ((tmp & ACPI_STA_FUNCTIONING) == 0)
|
|
/* don't register this object */
|
|
return 0;
|
|
}
|
|
|
|
/* check if this bridge has ejectable slots */
|
|
if (detect_ejectable_slots(handle) > 0) {
|
|
dbg("found PCI host-bus bridge with hot-pluggable slots\n");
|
|
add_host_bridge(root);
|
|
}
|
|
|
|
/* search P2P bridges under this host bridge */
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
|
|
find_p2p_bridge, NULL, NULL, NULL);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
list_for_each_entry(bridge, &bridge_list, list)
|
|
if (bridge->handle == handle)
|
|
return bridge;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void cleanup_bridge(struct acpiphp_bridge *bridge)
|
|
{
|
|
struct acpiphp_slot *slot, *next;
|
|
struct acpiphp_func *func, *tmp;
|
|
acpi_status status;
|
|
acpi_handle handle = bridge->handle;
|
|
|
|
if (!pci_is_root_bus(bridge->pci_bus)) {
|
|
status = acpi_remove_notify_handler(handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_bridge);
|
|
if (ACPI_FAILURE(status))
|
|
err("failed to remove notify handler\n");
|
|
}
|
|
|
|
if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
|
|
status = acpi_install_notify_handler(bridge->func->handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_func,
|
|
bridge->func);
|
|
if (ACPI_FAILURE(status))
|
|
err("failed to install interrupt notify handler\n");
|
|
}
|
|
|
|
slot = bridge->slots;
|
|
while (slot) {
|
|
next = slot->next;
|
|
list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) {
|
|
if (is_dock_device(func->handle)) {
|
|
unregister_hotplug_dock_device(func->handle);
|
|
unregister_dock_notifier(&func->nb);
|
|
}
|
|
if (!(func->flags & FUNC_HAS_DCK)) {
|
|
status = acpi_remove_notify_handler(func->handle,
|
|
ACPI_SYSTEM_NOTIFY,
|
|
handle_hotplug_event_func);
|
|
if (ACPI_FAILURE(status))
|
|
err("failed to remove notify handler\n");
|
|
}
|
|
list_del(&func->sibling);
|
|
kfree(func);
|
|
}
|
|
acpiphp_unregister_hotplug_slot(slot);
|
|
list_del(&slot->funcs);
|
|
kfree(slot);
|
|
slot = next;
|
|
}
|
|
|
|
/*
|
|
* Only P2P bridges have a pci_dev
|
|
*/
|
|
if (bridge->pci_dev)
|
|
put_device(&bridge->pci_bus->dev);
|
|
|
|
pci_dev_put(bridge->pci_dev);
|
|
list_del(&bridge->list);
|
|
kfree(bridge);
|
|
}
|
|
|
|
static acpi_status
|
|
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
|
|
/* cleanup p2p bridges under this P2P bridge
|
|
in a depth-first manner */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
|
|
cleanup_p2p_bridge, NULL, NULL, NULL);
|
|
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge)
|
|
cleanup_bridge(bridge);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static void remove_bridge(struct acpi_pci_root *root)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
acpi_handle handle = root->device->handle;
|
|
|
|
/* cleanup p2p bridges under this host bridge
|
|
in a depth-first manner */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
|
|
(u32)1, cleanup_p2p_bridge, NULL, NULL, NULL);
|
|
|
|
/*
|
|
* On root bridges with hotplug slots directly underneath (ie,
|
|
* no p2p bridge between), we call cleanup_bridge().
|
|
*
|
|
* The else clause cleans up root bridges that either had no
|
|
* hotplug slots at all, or had a p2p bridge underneath.
|
|
*/
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge)
|
|
cleanup_bridge(bridge);
|
|
}
|
|
|
|
static int power_on_slot(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
struct acpiphp_func *func;
|
|
int retval = 0;
|
|
|
|
/* if already enabled, just skip */
|
|
if (slot->flags & SLOT_POWEREDON)
|
|
goto err_exit;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_PS0) {
|
|
dbg("%s: executing _PS0\n", __func__);
|
|
status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
warn("%s: _PS0 failed\n", __func__);
|
|
retval = -1;
|
|
goto err_exit;
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* TBD: evaluate _STA to check if the slot is enabled */
|
|
|
|
slot->flags |= SLOT_POWEREDON;
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
|
|
static int power_off_slot(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
struct acpiphp_func *func;
|
|
|
|
int retval = 0;
|
|
|
|
/* if already disabled, just skip */
|
|
if ((slot->flags & SLOT_POWEREDON) == 0)
|
|
goto err_exit;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_PS3) {
|
|
status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
warn("%s: _PS3 failed\n", __func__);
|
|
retval = -1;
|
|
goto err_exit;
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* TBD: evaluate _STA to check if the slot is disabled */
|
|
|
|
slot->flags &= (~SLOT_POWEREDON);
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* acpiphp_max_busnr - return the highest reserved bus number under the given bus.
|
|
* @bus: bus to start search with
|
|
*/
|
|
static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
|
|
{
|
|
struct list_head *tmp;
|
|
unsigned char max, n;
|
|
|
|
/*
|
|
* pci_bus_max_busnr will return the highest
|
|
* reserved busnr for all these children.
|
|
* that is equivalent to the bus->subordinate
|
|
* value. We don't want to use the parent's
|
|
* bus->subordinate value because it could have
|
|
* padding in it.
|
|
*/
|
|
max = bus->busn_res.start;
|
|
|
|
list_for_each(tmp, &bus->children) {
|
|
n = pci_bus_max_busnr(pci_bus_b(tmp));
|
|
if (n > max)
|
|
max = n;
|
|
}
|
|
return max;
|
|
}
|
|
|
|
|
|
/**
|
|
* acpiphp_bus_add - add a new bus to acpi subsystem
|
|
* @func: acpiphp_func of the bridge
|
|
*/
|
|
static int acpiphp_bus_add(struct acpiphp_func *func)
|
|
{
|
|
struct acpi_device *device;
|
|
int ret_val;
|
|
|
|
if (!acpi_bus_get_device(func->handle, &device)) {
|
|
dbg("bus exists... trim\n");
|
|
/* this shouldn't be in here, so remove
|
|
* the bus then re-add it...
|
|
*/
|
|
ret_val = acpi_bus_trim(device);
|
|
dbg("acpi_bus_trim return %x\n", ret_val);
|
|
}
|
|
|
|
ret_val = acpi_bus_scan(func->handle);
|
|
if (!ret_val)
|
|
ret_val = acpi_bus_get_device(func->handle, &device);
|
|
|
|
if (ret_val)
|
|
dbg("error adding bus, %x\n", -ret_val);
|
|
|
|
return ret_val;
|
|
}
|
|
|
|
|
|
/**
|
|
* acpiphp_bus_trim - trim a bus from acpi subsystem
|
|
* @handle: handle to acpi namespace
|
|
*/
|
|
static int acpiphp_bus_trim(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device;
|
|
int retval;
|
|
|
|
retval = acpi_bus_get_device(handle, &device);
|
|
if (retval) {
|
|
dbg("acpi_device not found\n");
|
|
return retval;
|
|
}
|
|
|
|
retval = acpi_bus_trim(device);
|
|
if (retval)
|
|
err("cannot remove from acpi list\n");
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
union acpi_object params[2];
|
|
struct acpi_object_list arg_list;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
arg_list.count = 2;
|
|
arg_list.pointer = params;
|
|
params[0].type = ACPI_TYPE_INTEGER;
|
|
params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
|
|
params[1].type = ACPI_TYPE_INTEGER;
|
|
params[1].integer.value = 1;
|
|
/* _REG is optional, we don't care about if there is failure */
|
|
acpi_evaluate_object(func->handle, "_REG", &arg_list, NULL);
|
|
}
|
|
}
|
|
|
|
static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
|
|
{
|
|
struct acpiphp_func *func;
|
|
|
|
if (!dev->subordinate)
|
|
return;
|
|
|
|
/* quirk, or pcie could set it already */
|
|
if (dev->is_hotplug_bridge)
|
|
return;
|
|
|
|
if (PCI_SLOT(dev->devfn) != slot->device)
|
|
return;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (PCI_FUNC(dev->devfn) == func->function) {
|
|
/* check if this bridge has ejectable slots */
|
|
if ((detect_ejectable_slots(func->handle) > 0))
|
|
dev->is_hotplug_bridge = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
/**
|
|
* enable_device - enable, configure a slot
|
|
* @slot: slot to be enabled
|
|
*
|
|
* This function should be called per *physical slot*,
|
|
* not per each slot object in ACPI namespace.
|
|
*/
|
|
static int __ref enable_device(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_dev *dev;
|
|
struct pci_bus *bus = slot->bridge->pci_bus;
|
|
struct acpiphp_func *func;
|
|
int retval = 0;
|
|
int num, max, pass;
|
|
acpi_status status;
|
|
|
|
if (slot->flags & SLOT_ENABLED)
|
|
goto err_exit;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling)
|
|
acpiphp_bus_add(func);
|
|
|
|
num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
|
|
if (num == 0) {
|
|
/* Maybe only part of funcs are added. */
|
|
dbg("No new device found\n");
|
|
goto err_exit;
|
|
}
|
|
|
|
max = acpiphp_max_busnr(bus);
|
|
for (pass = 0; pass < 2; pass++) {
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
if (PCI_SLOT(dev->devfn) != slot->device)
|
|
continue;
|
|
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
|
|
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
|
|
max = pci_scan_bridge(bus, dev, max, pass);
|
|
if (pass && dev->subordinate) {
|
|
check_hotplug_bridge(slot, dev);
|
|
pci_bus_size_bridges(dev->subordinate);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pci_bus_assign_resources(bus);
|
|
acpiphp_sanitize_bus(bus);
|
|
acpiphp_set_hpp_values(bus);
|
|
acpiphp_set_acpi_region(slot);
|
|
pci_enable_bridges(bus);
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
/* Assume that newly added devices are powered on already. */
|
|
if (!dev->is_added)
|
|
dev->current_state = PCI_D0;
|
|
}
|
|
|
|
pci_bus_add_devices(bus);
|
|
|
|
slot->flags |= SLOT_ENABLED;
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
|
|
func->function));
|
|
if (!dev) {
|
|
/* Do not set SLOT_ENABLED flag if some funcs
|
|
are not added. */
|
|
slot->flags &= (~SLOT_ENABLED);
|
|
continue;
|
|
}
|
|
|
|
if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
|
|
dev->hdr_type != PCI_HEADER_TYPE_CARDBUS) {
|
|
pci_dev_put(dev);
|
|
continue;
|
|
}
|
|
|
|
status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
warn("find_p2p_bridge failed (error code = 0x%x)\n",
|
|
status);
|
|
pci_dev_put(dev);
|
|
}
|
|
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
/* return first device in slot, acquiring a reference on it */
|
|
static struct pci_dev *dev_in_slot(struct acpiphp_slot *slot)
|
|
{
|
|
struct pci_bus *bus = slot->bridge->pci_bus;
|
|
struct pci_dev *dev;
|
|
struct pci_dev *ret = NULL;
|
|
|
|
down_read(&pci_bus_sem);
|
|
list_for_each_entry(dev, &bus->devices, bus_list)
|
|
if (PCI_SLOT(dev->devfn) == slot->device) {
|
|
ret = pci_dev_get(dev);
|
|
break;
|
|
}
|
|
up_read(&pci_bus_sem);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* disable_device - disable a slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
static int disable_device(struct acpiphp_slot *slot)
|
|
{
|
|
struct acpiphp_func *func;
|
|
struct pci_dev *pdev;
|
|
struct pci_bus *bus = slot->bridge->pci_bus;
|
|
|
|
/* The slot will be enabled when func 0 is added, so check
|
|
func 0 before disable the slot. */
|
|
pdev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
|
|
if (!pdev)
|
|
goto err_exit;
|
|
pci_dev_put(pdev);
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->bridge) {
|
|
/* cleanup p2p bridges under this P2P bridge */
|
|
cleanup_p2p_bridge(func->bridge->handle,
|
|
(u32)1, NULL, NULL);
|
|
func->bridge = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* enable_device() enumerates all functions in this device via
|
|
* pci_scan_slot(), whether they have associated ACPI hotplug
|
|
* methods (_EJ0, etc.) or not. Therefore, we remove all functions
|
|
* here.
|
|
*/
|
|
while ((pdev = dev_in_slot(slot))) {
|
|
pci_stop_and_remove_bus_device(pdev);
|
|
pci_dev_put(pdev);
|
|
}
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
acpiphp_bus_trim(func->handle);
|
|
}
|
|
|
|
slot->flags &= (~SLOT_ENABLED);
|
|
|
|
err_exit:
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* get_slot_status - get ACPI slot status
|
|
* @slot: ACPI PHP slot
|
|
*
|
|
* If a slot has _STA for each function and if any one of them
|
|
* returned non-zero status, return it.
|
|
*
|
|
* If a slot doesn't have _STA and if any one of its functions'
|
|
* configuration space is configured, return 0x0f as a _STA.
|
|
*
|
|
* Otherwise return 0.
|
|
*/
|
|
static unsigned int get_slot_status(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
unsigned long long sta = 0;
|
|
u32 dvid;
|
|
struct acpiphp_func *func;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
if (func->flags & FUNC_HAS_STA) {
|
|
status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
|
|
if (ACPI_SUCCESS(status) && sta)
|
|
break;
|
|
} else {
|
|
pci_bus_read_config_dword(slot->bridge->pci_bus,
|
|
PCI_DEVFN(slot->device,
|
|
func->function),
|
|
PCI_VENDOR_ID, &dvid);
|
|
if (dvid != 0xffffffff) {
|
|
sta = ACPI_STA_ALL;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return (unsigned int)sta;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_eject_slot - physically eject the slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_eject_slot(struct acpiphp_slot *slot)
|
|
{
|
|
acpi_status status;
|
|
struct acpiphp_func *func;
|
|
struct acpi_object_list arg_list;
|
|
union acpi_object arg;
|
|
|
|
list_for_each_entry(func, &slot->funcs, sibling) {
|
|
/* We don't want to call _EJ0 on non-existing functions. */
|
|
if ((func->flags & FUNC_HAS_EJ0)) {
|
|
/* _EJ0 method take one argument */
|
|
arg_list.count = 1;
|
|
arg_list.pointer = &arg;
|
|
arg.type = ACPI_TYPE_INTEGER;
|
|
arg.integer.value = 1;
|
|
|
|
status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
warn("%s: _EJ0 failed\n", __func__);
|
|
return -1;
|
|
} else
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_check_bridge - re-enumerate devices
|
|
* @bridge: where to begin re-enumeration
|
|
*
|
|
* Iterate over all slots under this bridge and make sure that if a
|
|
* card is present they are enabled, and if not they are disabled.
|
|
*/
|
|
static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
|
|
{
|
|
struct acpiphp_slot *slot;
|
|
int retval = 0;
|
|
int enabled, disabled;
|
|
|
|
enabled = disabled = 0;
|
|
|
|
for (slot = bridge->slots; slot; slot = slot->next) {
|
|
unsigned int status = get_slot_status(slot);
|
|
if (slot->flags & SLOT_ENABLED) {
|
|
if (status == ACPI_STA_ALL)
|
|
continue;
|
|
retval = acpiphp_disable_slot(slot);
|
|
if (retval) {
|
|
err("Error occurred in disabling\n");
|
|
goto err_exit;
|
|
} else {
|
|
acpiphp_eject_slot(slot);
|
|
}
|
|
disabled++;
|
|
} else {
|
|
if (status != ACPI_STA_ALL)
|
|
continue;
|
|
retval = acpiphp_enable_slot(slot);
|
|
if (retval) {
|
|
err("Error occurred in enabling\n");
|
|
goto err_exit;
|
|
}
|
|
enabled++;
|
|
}
|
|
}
|
|
|
|
dbg("%s: %d enabled, %d disabled\n", __func__, enabled, disabled);
|
|
|
|
err_exit:
|
|
return retval;
|
|
}
|
|
|
|
static void acpiphp_set_hpp_values(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list)
|
|
pci_configure_slot(dev);
|
|
}
|
|
|
|
/*
|
|
* Remove devices for which we could not assign resources, call
|
|
* arch specific code to fix-up the bus
|
|
*/
|
|
static void acpiphp_sanitize_bus(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *dev;
|
|
int i;
|
|
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
|
|
|
|
list_for_each_entry(dev, &bus->devices, bus_list) {
|
|
for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
|
|
struct resource *res = &dev->resource[i];
|
|
if ((res->flags & type_mask) && !res->start &&
|
|
res->end) {
|
|
/* Could not assign a required resources
|
|
* for this device, remove it */
|
|
pci_stop_and_remove_bus_device(dev);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ACPI event handlers
|
|
*/
|
|
|
|
static acpi_status
|
|
check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
|
|
bridge = acpiphp_handle_to_bridge(handle);
|
|
if (bridge) {
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
dbg("%s: re-enumerating slots under %s\n",
|
|
__func__, objname);
|
|
acpiphp_check_bridge(bridge);
|
|
}
|
|
return AE_OK ;
|
|
}
|
|
|
|
static void _handle_hotplug_event_bridge(struct work_struct *work)
|
|
{
|
|
struct acpiphp_bridge *bridge;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
struct acpi_hp_work *hp_work;
|
|
acpi_handle handle;
|
|
u32 type;
|
|
|
|
hp_work = container_of(work, struct acpi_hp_work, work);
|
|
handle = hp_work->handle;
|
|
type = hp_work->type;
|
|
bridge = (struct acpiphp_bridge *)hp_work->context;
|
|
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus re-enumerate */
|
|
dbg("%s: Bus check notify on %s\n", __func__, objname);
|
|
dbg("%s: re-enumerating slots under %s\n", __func__, objname);
|
|
acpiphp_check_bridge(bridge);
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
|
|
ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL, NULL);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check */
|
|
dbg("%s: Device check notify on %s\n", __func__, objname);
|
|
acpiphp_check_bridge(bridge);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_WAKE:
|
|
/* wake event */
|
|
dbg("%s: Device wake notify on %s\n", __func__, objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
dbg("%s: Device eject notify on %s\n", __func__, objname);
|
|
if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
|
|
struct acpiphp_slot *slot;
|
|
slot = bridge->func->slot;
|
|
if (!acpiphp_disable_slot(slot))
|
|
acpiphp_eject_slot(slot);
|
|
}
|
|
break;
|
|
|
|
case ACPI_NOTIFY_FREQUENCY_MISMATCH:
|
|
printk(KERN_ERR "Device %s cannot be configured due"
|
|
" to a frequency mismatch\n", objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_BUS_MODE_MISMATCH:
|
|
printk(KERN_ERR "Device %s cannot be configured due"
|
|
" to a bus mode mismatch\n", objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_POWER_FAULT:
|
|
printk(KERN_ERR "Device %s has suffered a power fault\n",
|
|
objname);
|
|
break;
|
|
|
|
default:
|
|
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
|
|
break;
|
|
}
|
|
|
|
kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
|
|
}
|
|
|
|
/**
|
|
* handle_hotplug_event_bridge - handle ACPI event on bridges
|
|
* @handle: Notify()'ed acpi_handle
|
|
* @type: Notify code
|
|
* @context: pointer to acpiphp_bridge structure
|
|
*
|
|
* Handles ACPI event notification on {host,p2p} bridges.
|
|
*/
|
|
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type,
|
|
void *context)
|
|
{
|
|
/*
|
|
* Currently the code adds all hotplug events to the kacpid_wq
|
|
* queue when it should add hotplug events to the kacpi_hotplug_wq.
|
|
* The proper way to fix this is to reorganize the code so that
|
|
* drivers (dock, etc.) do not call acpi_os_execute(), etc.
|
|
* For now just re-add this work to the kacpi_hotplug_wq so we
|
|
* don't deadlock on hotplug actions.
|
|
*/
|
|
alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_bridge);
|
|
}
|
|
|
|
static void _handle_hotplug_event_func(struct work_struct *work)
|
|
{
|
|
struct acpiphp_func *func;
|
|
char objname[64];
|
|
struct acpi_buffer buffer = { .length = sizeof(objname),
|
|
.pointer = objname };
|
|
struct acpi_hp_work *hp_work;
|
|
acpi_handle handle;
|
|
u32 type;
|
|
|
|
hp_work = container_of(work, struct acpi_hp_work, work);
|
|
handle = hp_work->handle;
|
|
type = hp_work->type;
|
|
func = (struct acpiphp_func *)hp_work->context;
|
|
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
|
|
switch (type) {
|
|
case ACPI_NOTIFY_BUS_CHECK:
|
|
/* bus re-enumerate */
|
|
dbg("%s: Bus check notify on %s\n", __func__, objname);
|
|
acpiphp_enable_slot(func->slot);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_CHECK:
|
|
/* device check : re-enumerate from parent bus */
|
|
dbg("%s: Device check notify on %s\n", __func__, objname);
|
|
acpiphp_check_bridge(func->slot->bridge);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_DEVICE_WAKE:
|
|
/* wake event */
|
|
dbg("%s: Device wake notify on %s\n", __func__, objname);
|
|
break;
|
|
|
|
case ACPI_NOTIFY_EJECT_REQUEST:
|
|
/* request device eject */
|
|
dbg("%s: Device eject notify on %s\n", __func__, objname);
|
|
if (!(acpiphp_disable_slot(func->slot)))
|
|
acpiphp_eject_slot(func->slot);
|
|
break;
|
|
|
|
default:
|
|
warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
|
|
break;
|
|
}
|
|
|
|
kfree(hp_work); /* allocated in handle_hotplug_event_func */
|
|
}
|
|
|
|
/**
|
|
* handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
|
|
* @handle: Notify()'ed acpi_handle
|
|
* @type: Notify code
|
|
* @context: pointer to acpiphp_func structure
|
|
*
|
|
* Handles ACPI event notification on slots.
|
|
*/
|
|
static void handle_hotplug_event_func(acpi_handle handle, u32 type,
|
|
void *context)
|
|
{
|
|
/*
|
|
* Currently the code adds all hotplug events to the kacpid_wq
|
|
* queue when it should add hotplug events to the kacpi_hotplug_wq.
|
|
* The proper way to fix this is to reorganize the code so that
|
|
* drivers (dock, etc.) do not call acpi_os_execute(), etc.
|
|
* For now just re-add this work to the kacpi_hotplug_wq so we
|
|
* don't deadlock on hotplug actions.
|
|
*/
|
|
alloc_acpi_hp_work(handle, type, context, _handle_hotplug_event_func);
|
|
}
|
|
|
|
static struct acpi_pci_driver acpi_pci_hp_driver = {
|
|
.add = add_bridge,
|
|
.remove = remove_bridge,
|
|
};
|
|
|
|
/**
|
|
* acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
|
|
*/
|
|
int __init acpiphp_glue_init(void)
|
|
{
|
|
acpi_pci_register_driver(&acpi_pci_hp_driver);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
|
|
*
|
|
* This function frees all data allocated in acpiphp_glue_init().
|
|
*/
|
|
void acpiphp_glue_exit(void)
|
|
{
|
|
acpi_pci_unregister_driver(&acpi_pci_hp_driver);
|
|
}
|
|
|
|
/**
|
|
* acpiphp_enable_slot - power on slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_enable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
int retval;
|
|
|
|
mutex_lock(&slot->crit_sect);
|
|
|
|
/* wake up all functions */
|
|
retval = power_on_slot(slot);
|
|
if (retval)
|
|
goto err_exit;
|
|
|
|
if (get_slot_status(slot) == ACPI_STA_ALL) {
|
|
/* configure all functions */
|
|
retval = enable_device(slot);
|
|
if (retval)
|
|
power_off_slot(slot);
|
|
} else {
|
|
dbg("%s: Slot status is not ACPI_STA_ALL\n", __func__);
|
|
power_off_slot(slot);
|
|
}
|
|
|
|
err_exit:
|
|
mutex_unlock(&slot->crit_sect);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* acpiphp_disable_slot - power off slot
|
|
* @slot: ACPI PHP slot
|
|
*/
|
|
int acpiphp_disable_slot(struct acpiphp_slot *slot)
|
|
{
|
|
int retval = 0;
|
|
|
|
mutex_lock(&slot->crit_sect);
|
|
|
|
/* unconfigure all functions */
|
|
retval = disable_device(slot);
|
|
if (retval)
|
|
goto err_exit;
|
|
|
|
/* power off all functions */
|
|
retval = power_off_slot(slot);
|
|
if (retval)
|
|
goto err_exit;
|
|
|
|
err_exit:
|
|
mutex_unlock(&slot->crit_sect);
|
|
return retval;
|
|
}
|
|
|
|
|
|
/*
|
|
* slot enabled: 1
|
|
* slot disabled: 0
|
|
*/
|
|
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
|
|
{
|
|
return (slot->flags & SLOT_POWEREDON);
|
|
}
|
|
|
|
|
|
/*
|
|
* latch open: 1
|
|
* latch closed: 0
|
|
*/
|
|
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
|
|
{
|
|
unsigned int sta;
|
|
|
|
sta = get_slot_status(slot);
|
|
|
|
return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* adapter presence : 1
|
|
* absence : 0
|
|
*/
|
|
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
|
|
{
|
|
unsigned int sta;
|
|
|
|
sta = get_slot_status(slot);
|
|
|
|
return (sta == 0) ? 0 : 1;
|
|
}
|