From: Jiang Liu <liuj97@xxxxxxxxx>
From: Jiang Liu <jiang.liu@xxxxxxxxxx>
This patchset enhance pci_root driver to update MMCFG information when
hot-plugging PCI root bridges. It applies to
git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git pci/next-3.5
-v2: split into smaller patches and skip updating MMCFG information when
MMCFG is disabled
-v3: add mmconf_added to simply free path, also make pci_mmconfig_insert()
to process extra exist case --- By Yinghai
-v4: tune arch_acpi_pci_root_add() to handle a corner case raised by Kenji
-v5: address review comments from Bjorn and Taku, also better handle corner
cases in arch_acpi_pci_root_add()
-v6: get rid of arch_acpi_pci_root_xxx() by using existing hooks
add MCFG information for host bridges on demand
more corner cases clear up
correctly handle condition compilation
fix section mismatch issues
fix a issue reported by Taku about a BIOS bug
The first 4 patches in series is the same with v5.
On a test platform with four SandyBridge processors, MMCFG resources from
/proc/iomem are as below.
With original implementation:
bf000000-cfffffff : reserved
c0000000-cfffffff : PCI MMCONFIG 0000 [bus 00-ff]
With patch set applied:
bf000000-cfffffff : reserved
c0000000-c3efffff : PCI MMCONFIG 0000 [bus 00-3e]
c3f00000-c3ffffff : PCI MMCONFIG 0000 [bus 3f-3f]
c4000000-c7efffff : PCI MMCONFIG 0000 [bus 40-7e]
c7f00000-c7ffffff : PCI MMCONFIG 0000 [bus 7f-7f]
c8000000-cbefffff : PCI MMCONFIG 0000 [bus 80-be]
cbf00000-cbffffff : PCI MMCONFIG 0000 [bus bf-bf]
cc000000-cfefffff : PCI MMCONFIG 0000 [bus c0-fe]
cff00000-cfffffff : PCI MMCONFIG 0000 [bus ff-ff]
After removing a host bridge:
bf000000-cfffffff : reserved
c0000000-c3efffff : PCI MMCONFIG 0000 [bus 00-3e]
c3f00000-c3ffffff : PCI MMCONFIG 0000 [bus 3f-3f]
c4000000-c7efffff : PCI MMCONFIG 0000 [bus 40-7e]
c7f00000-c7ffffff : PCI MMCONFIG 0000 [bus 7f-7f]
c8000000-cbefffff : PCI MMCONFIG 0000 [bus 80-be]
cbf00000-cbffffff : PCI MMCONFIG 0000 [bus bf-bf]
cc000000-cfefffff : PCI MMCONFIG 0000 [bus c0-fe]
cff00000-cfffffff : PCI MMCONFIG 0000 [bus ff-ff]
After adding the host bridge back
bf000000-cfffffff : reserved
c0000000-c3efffff : PCI MMCONFIG 0000 [bus 00-3e]
c3f00000-c3ffffff : PCI MMCONFIG 0000 [bus 3f-3f]
c4000000-c7efffff : PCI MMCONFIG 0000 [bus 40-7e]
c7f00000-c7ffffff : PCI MMCONFIG 0000 [bus 7f-7f]
c8000000-cbefffff : PCI MMCONFIG 0000 [bus 80-be]
cbf00000-cbffffff : PCI MMCONFIG 0000 [bus bf-bf]
cc000000-cfefffff : PCI MMCONFIG 0000 [bus c0-fe]
cff00000-cfffffff : PCI MMCONFIG 0000 [bus ff-ff]
Jiang Liu (9):
PCI, x86: split out pci_mmcfg_check_reserved() for code reuse
PCI, x86: split out pci_mmconfig_alloc() for code reuse
PCI, x86: use RCU list to protect mmconfig list
PCI, x86: introduce pci_mmcfg_arch_map()/pci_mmcfg_arch_unmap()
PCI, x86: introduce pci_mmconfig_insert()/delete() for PCI root
bridge hotplug
PCI, ACPI: provide MCFG address for PCI host bridges
PCI, x86: update MMCFG information when hot-plugging PCI host bridges
PCI, x86: add MMCFG information on demand
PCI, x86: simplify pci_mmcfg_late_insert_resources()
arch/x86/include/asm/pci_x86.h | 11 ++
arch/x86/pci/acpi.c | 71 ++++++++++
arch/x86/pci/legacy.c | 1 +
arch/x86/pci/mmconfig-shared.c | 280 ++++++++++++++++++++++++++++++----------
arch/x86/pci/mmconfig_32.c | 30 ++++-
arch/x86/pci/mmconfig_64.c | 37 +++++-
drivers/acpi/pci_root.c | 12 ++
drivers/pci/pci-acpi.c | 34 +++++
include/acpi/acnames.h | 1 +
include/acpi/acpi_bus.h | 3 +
include/linux/pci-acpi.h | 5 +
11 files changed, 412 insertions(+), 73 deletions(-)
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