[PATCH v5 0/4] PCI MCFG consolidation and APEI resource filtering

Xuesong Chen
2021-11-04T10:59:28Z

The issue of commit d91525eb8ee6 ("ACPI, EINJ: Enhance error injection tolerance
level") on x86 is also happened on our own ARM64 platform. We sent a patch[1]
trying to fix this issue in an arch-specific way as x86 does at first, but
according to the suggestion from Lorenzo Pieralisi and Catalin Marinas, we can
consolidate the PCI MCFG part then fix it in a more common way, that's why this
patch series comes.

[1] https://marc.info/?l=linux-arm-kernel&m=163108478627166&w=2

---
Change from v4 to v5:
- Fix the warning: no previous prototype for 'remove_quirk_mcfg_res' warning
reported by the kernel test robot.

Change from v3 to v4:
- Add a new patch (patch #3) to address the quirk ECAM access issue. Because
the normal ECAM config space can be accessed in a lockless way, so we don't
need the mutual exclusion with the EINJ action. But those quirks maybe break
this rule and corrupt the configuration access, reserve its MCFG address
regions in this case to avoid that happens.

- Add another patch (patch #4) to log the PCI MCFG entry parse message per
the suggestion from Bjorn Helgaas. The output on ARM64 as:
ACPI: MCFG entry for domain 0000 [bus 00-0f] at [mem 0x50000000-0x50ffffff] (base 0x50000000)

- Commit message updated with more details of patch #2

Change from v2 to v3:
- Address the comments of Lorenzo Pieralisi about the CONFIG_PCI
dependence issue in APEI module (patch #2)

Change from v1 to v2:
- Fix the "undefined reference to `pci_mmcfg_list'" build error in case
of PCI_CONFIG=n, reported by the kernel test robot

Xuesong Chen (4):
PCI: MCFG: Consolidate the separate PCI MCFG table entry list
ACPI: APEI: Filter the PCI MCFG address with an arch-agnostic method
ACPI: APEI: Reserve the MCFG address for quirk ECAM implementation
PCI: MCFG: Add the MCFG entry parse log message

arch/x86/include/asm/pci_x86.h | 17 +----------
arch/x86/pci/mmconfig-shared.c | 30 -------------------
drivers/acpi/apei/apei-base.c | 68 ++++++++++++++++++++++++++++++++----------
drivers/acpi/pci_mcfg.c | 46 +++++++++++++++-------------
drivers/pci/pci.c | 2 ++
drivers/pci/quirks.c | 2 ++
include/linux/pci.h | 18 +++++++++++
7 files changed, 101 insertions(+), 82 deletions(-)