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pci-v6.2-fixes-1

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Merge tag 'pci-v6.2-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull pci fixes from Bjorn Helgaas:

 - Work around apparent firmware issue that made Linux reject MMCONFIG
   space, which broke PCI extended config space (Bjorn Helgaas)

 - Fix CONFIG_PCIE_BT1 dependency due to mid-air collision between a
   PCI_MSI_IRQ_DOMAIN -> PCI_MSI change and addition of PCIE_BT1 (Lukas
   Bulwahn)

* tag 'pci-v6.2-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  x86/pci: Treat EfiMemoryMappedIO as reservation of ECAM space
  x86/pci: Simplify is_mmconf_reserved() messages
  PCI: dwc: Adjust to recent removal of PCI_MSI_IRQ_DOMAIN
This commit is contained in:
Linus Torvalds 2023-01-13 17:32:22 -06:00
commit 9e058c2952
2 changed files with 39 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
arch/x86/pci/mmconfig-shared.c
View File

@ -12,6 +12,7 @@
*/
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/bitmap.h>
@ -442,17 +443,42 @@ static bool is_acpi_reserved(u64 start, u64 end, enum e820_type not_used)
return mcfg_res.flags;
}
static bool is_efi_mmio(u64 start, u64 end, enum e820_type not_used)
{
#ifdef CONFIG_EFI
efi_memory_desc_t *md;
u64 size, mmio_start, mmio_end;
for_each_efi_memory_desc(md) {
if (md->type == EFI_MEMORY_MAPPED_IO) {
size = md->num_pages << EFI_PAGE_SHIFT;
mmio_start = md->phys_addr;
mmio_end = mmio_start + size;
/*
* N.B. Caller supplies (start, start + size),
* so to match, mmio_end is the first address
* *past* the EFI_MEMORY_MAPPED_IO area.
*/
if (mmio_start <= start && end <= mmio_end)
return true;
}
}
#endif
return false;
}
typedef bool (*check_reserved_t)(u64 start, u64 end, enum e820_type type);
static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
struct pci_mmcfg_region *cfg,
struct device *dev, int with_e820)
struct device *dev, const char *method)
{
u64 addr = cfg->res.start;
u64 size = resource_size(&cfg->res);
u64 old_size = size;
int num_buses;
char *method = with_e820 ? "E820" : "ACPI motherboard resources";
while (!is_reserved(addr, addr + size, E820_TYPE_RESERVED)) {
size >>= 1;
@ -464,10 +490,10 @@ static bool __ref is_mmconf_reserved(check_reserved_t is_reserved,
return false;
if (dev)
dev_info(dev, "MMCONFIG at %pR reserved in %s\n",
dev_info(dev, "MMCONFIG at %pR reserved as %s\n",
&cfg->res, method);
else
pr_info(PREFIX "MMCONFIG at %pR reserved in %s\n",
pr_info(PREFIX "MMCONFIG at %pR reserved as %s\n",
&cfg->res, method);
if (old_size != size) {
@ -500,7 +526,8 @@ static bool __ref
pci_mmcfg_check_reserved(struct device *dev, struct pci_mmcfg_region *cfg, int early)
{
if (!early && !acpi_disabled) {
if (is_mmconf_reserved(is_acpi_reserved, cfg, dev, 0))
if (is_mmconf_reserved(is_acpi_reserved, cfg, dev,
"ACPI motherboard resource"))
return true;
if (dev)
@ -513,6 +540,10 @@ pci_mmcfg_check_reserved(struct device *dev, struct pci_mmcfg_region *cfg, int e
"MMCONFIG at %pR not reserved in "
"ACPI motherboard resources\n",
&cfg->res);
if (is_mmconf_reserved(is_efi_mmio, cfg, dev,
"EfiMemoryMappedIO"))
return true;
}
/*
@ -527,7 +558,8 @@ pci_mmcfg_check_reserved(struct device *dev, struct pci_mmcfg_region *cfg, int e
/* Don't try to do this check unless configuration
type 1 is available. how about type 2 ?*/
if (raw_pci_ops)
return is_mmconf_reserved(e820__mapped_all, cfg, dev, 1);
return is_mmconf_reserved(e820__mapped_all, cfg, dev,
"E820 entry");
return false;
}

2
drivers/pci/controller/dwc/Kconfig
View File

@ -225,7 +225,7 @@ config PCIE_ARTPEC6_EP
config PCIE_BT1
tristate "Baikal-T1 PCIe controller"
depends on MIPS_BAIKAL_T1 || COMPILE_TEST
depends on PCI_MSI_IRQ_DOMAIN
depends on PCI_MSI
select PCIE_DW_HOST
help
Enables support for the PCIe controller in the Baikal-T1 SoC to work