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author | Ingo Molnar <mingo@kernel.org> | 2015-05-11 16:05:09 +0200 |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-05-11 16:05:09 +0200 |
commit | 191a66353b22fad8ac89404ab4c929cbe7b0afb2 (patch) | |
tree | bd7affc4bc640eb42e5ff3285922497285f8fdd7 /arch/x86/pci | |
parent | f5d6a52f511157c7476590532a23b5664b1ed877 (diff) | |
parent | f21262b8e092a770e39fbd405cc18a0247c3af68 (diff) | |
download | blackbird-op-linux-191a66353b22fad8ac89404ab4c929cbe7b0afb2.tar.gz blackbird-op-linux-191a66353b22fad8ac89404ab4c929cbe7b0afb2.zip |
Merge branch 'x86/asm' into x86/apic, to resolve a conflict
Conflicts:
arch/x86/kernel/apic/io_apic.c
arch/x86/kernel/apic/vector.c
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/pci')
-rw-r--r-- | arch/x86/pci/acpi.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index e4695985f9de..d93963340c3c 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -325,6 +325,26 @@ static void release_pci_root_info(struct pci_host_bridge *bridge) kfree(info); } +/* + * An IO port or MMIO resource assigned to a PCI host bridge may be + * consumed by the host bridge itself or available to its child + * bus/devices. The ACPI specification defines a bit (Producer/Consumer) + * to tell whether the resource is consumed by the host bridge itself, + * but firmware hasn't used that bit consistently, so we can't rely on it. + * + * On x86 and IA64 platforms, all IO port and MMIO resources are assumed + * to be available to child bus/devices except one special case: + * IO port [0xCF8-0xCFF] is consumed by the host bridge itself + * to access PCI configuration space. + * + * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF]. + */ +static bool resource_is_pcicfg_ioport(struct resource *res) +{ + return (res->flags & IORESOURCE_IO) && + res->start == 0xCF8 && res->end == 0xCFF; +} + static void probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device, int busnum, int domain, @@ -346,8 +366,8 @@ static void probe_pci_root_info(struct pci_root_info *info, "no IO and memory resources present in _CRS\n"); else resource_list_for_each_entry_safe(entry, tmp, list) { - if ((entry->res->flags & IORESOURCE_WINDOW) == 0 || - (entry->res->flags & IORESOURCE_DISABLED)) + if ((entry->res->flags & IORESOURCE_DISABLED) || + resource_is_pcicfg_ioport(entry->res)) resource_list_destroy_entry(entry); else entry->res->name = info->name; |