mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 03:15:23 +07:00
2cd6975a4f
x86 has two kinds of PCI root bus scanning:
(1) ACPI-based, using _CRS resources. This used pci_create_bus(), not
pci_scan_bus(), because ACPI hotplug needed to split the
pci_bus_add_devices() into a separate host bridge .start() method.
This patch parses the _CRS resources earlier, so we can build a list of
resources and pass it to pci_create_root_bus().
Note that as before, we parse the _CRS even if we aren't going to use
it so we can print it for debugging purposes.
(2) All other, which used either default resources (ioport_resource and
iomem_resource) or information read from the hardware via amd_bus.c or
similar. This used pci_scan_bus().
This patch converts x86_pci_root_bus_res_quirks() (previously called
from pcibios_fixup_bus()) to x86_pci_root_bus_resources(), which builds
a list of resources before we call pci_scan_root_bus().
We also use x86_pci_root_bus_resources() if we have ACPI but are
ignoring _CRS.
CC: Yinghai Lu <yinghai.lu@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/range.h>
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#include "bus_numa.h"
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int pci_root_num;
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struct pci_root_info pci_root_info[PCI_ROOT_NR];
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void x86_pci_root_bus_resources(int bus, struct list_head *resources)
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{
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int i;
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int j;
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struct pci_root_info *info;
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if (!pci_root_num)
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goto default_resources;
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for (i = 0; i < pci_root_num; i++) {
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if (pci_root_info[i].bus_min == bus)
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break;
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}
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if (i == pci_root_num)
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goto default_resources;
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printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
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bus);
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info = &pci_root_info[i];
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for (j = 0; j < info->res_num; j++) {
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struct resource *res;
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struct resource *root;
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res = &info->res[j];
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pci_add_resource(resources, res);
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if (res->flags & IORESOURCE_IO)
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root = &ioport_resource;
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else
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root = &iomem_resource;
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insert_resource(root, res);
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}
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return;
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default_resources:
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/*
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* We don't have any host bridge aperture information from the
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* "native host bridge drivers," e.g., amd_bus or broadcom_bus,
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* so fall back to the defaults historically used by pci_create_bus().
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*/
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printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
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pci_add_resource(resources, &ioport_resource);
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pci_add_resource(resources, &iomem_resource);
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}
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void __devinit update_res(struct pci_root_info *info, resource_size_t start,
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resource_size_t end, unsigned long flags, int merge)
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{
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int i;
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struct resource *res;
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if (start > end)
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return;
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if (start == MAX_RESOURCE)
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return;
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if (!merge)
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goto addit;
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/* try to merge it with old one */
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for (i = 0; i < info->res_num; i++) {
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resource_size_t final_start, final_end;
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resource_size_t common_start, common_end;
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res = &info->res[i];
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if (res->flags != flags)
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continue;
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common_start = max(res->start, start);
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common_end = min(res->end, end);
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if (common_start > common_end + 1)
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continue;
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final_start = min(res->start, start);
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final_end = max(res->end, end);
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res->start = final_start;
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res->end = final_end;
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return;
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}
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addit:
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/* need to add that */
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if (info->res_num >= RES_NUM)
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return;
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res = &info->res[info->res_num];
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res->name = info->name;
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res->flags = flags;
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res->start = start;
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res->end = end;
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res->child = NULL;
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info->res_num++;
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}
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