This patchset provides a generic ACPI based PCI host controller
implementation and uses it on arm64.
The first patch moves the common code to handle MCFG ACPI table from
arch/x86 to drivers/acpi/pci_mcfg.c. The last patch in the patchset
provides the generic implementation of an ACPI based PCI host
controller with a new file drivers/acpi/pci_host_acpi.c. The other
patches are to fix up arm64 and ACPI code to work with these two
patches.
The pci host controller implementation keeps a reference to
pci_mmcfg_region entry so that config space access is done with a
simple mapping and generic PCI config read/write. There is also an
implementation of raw_pci_read/raw_pci_write provided by walking the
pci_mmcfg_list
The patchset is against 4.4-rc6, but it can be applied to pci/next
with a very minor fixup. This is tested with arm64 QEMU and OVMF
and on x86 with qemu.
More testing or comments are welcome. The idea is to provide a
simpler alternative for ACPI PCI support in arm64, any feedback
from PCI or ACPI maintainers would be appreciated on this front.
Thanks,
JC.
v4->v5:
- Fix arm build issue reported by the kbuild bot
- Use config_enabled instead of ifdef in pci_mcfg.c
v3->v4:
- Handle suggestions from Arnd Bergmann <arnd@xxxxxxxx>
* move the implementation of host controller to drivers/acpi
under config option CONFIG_ACPI_PCI_HOST_GENERIC
* remove unnecessary arch hooks (this done as much as possible
without affecting the scope of the patch, will need another
separate patchset for the rest).
* remove pcibios_assign_resources fs_initcall that was added
- fixup domain_nr assignment code, and move ACPI companion set
to PCI code.
- Call map resource correctly in setup code
- fix kbuild robot report
- More testing
v2->v3:
- Move maintenance of the pci_mmcfg_list to drivers/acpi/pci_mcfg.c
without changing x86 logic
- use the pci_mmcfg_list in ARM64 implementation
- provide raw_pci_read/raw_pci_write
v1->v2:
- use CONFIG_PCI_MMCONFIG on arm64, provide a weak implementation
of pci_mmcfg_late_init for arm64.
- The real implementation of pci_mmcfg_late_init is in pci-host-acpi.c
and it will save the MCFG table entries to an array. Earlier this
was done with an arch_init call
- remove unneeded pci_bus_add_devices call and fix MCFG saving code
- Added a patch to ACPI pci_root.c to handle arm64 PCI IO resources
Jayachandran C (5):
APCI: MCFG: Move mmcfg_list management to drivers/acpi
PCI: Handle ACPI companion and domain number
ACPI: PCI: Support platforms that need pci_remap_iospace
arm64: pci: Add ACPI support
PCI: ACPI: Add a generic ACPI based host controller
arch/arm64/Kconfig | 3 +
arch/arm64/kernel/pci.c | 34 ++++-
arch/x86/include/asm/pci_x86.h | 24 +---
arch/x86/pci/mmconfig-shared.c | 269 +++++------------------------------
arch/x86/pci/mmconfig_32.c | 1 +
arch/x86/pci/mmconfig_64.c | 1 +
arch/x86/pci/numachip.c | 1 +
drivers/acpi/Kconfig | 8 ++
drivers/acpi/Makefile | 2 +
drivers/acpi/pci_host_acpi.c | 186 ++++++++++++++++++++++++
drivers/acpi/pci_mcfg.c | 312 +++++++++++++++++++++++++++++++++++++++++
drivers/acpi/pci_root.c | 62 +++++++-
drivers/acpi/resource.c | 2 +
drivers/pci/pci.c | 15 +-
drivers/pci/probe.c | 2 +
include/linux/pci-acpi.h | 59 ++++++++
16 files changed, 716 insertions(+), 265 deletions(-)
create mode 100644 drivers/acpi/pci_host_acpi.c
create mode 100644 drivers/acpi/pci_mcfg.c
--
1.9.1
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