PCI: use ACPI _CRS data by default

At this point, it seems to solve more problems than it causes, so let's try using it by default.  It's an easy revert if it ends up causing trouble.

Reviewed-by: Yinghai Lu <yhlu.kernel@gmail.com>
Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index fd5cac0..7bdaf50 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1787,7 +1787,7 @@ and is between 256 and 4096 characters. It is defined in the file
                                IRQ routing is enabled.
                noacpi          [X86] Do not use ACPI for IRQ routing
                                or for PCI scanning.
-               use_crs         [X86] Use _CRS for PCI resource
+               nocrs           [X86] Don't use _CRS for PCI resource
                                allocation.
                routeirq        Do IRQ routing for all PCI devices.
                                This is normally done in pci_enable_device(),

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index e60fd3e..cb739cc 100644 (file)
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -25,7 +25,7 @@
 #define PCI_BIOS_IRQ_SCAN      0x2000
 #define PCI_ASSIGN_ALL_BUSSES  0x4000
 #define PCI_CAN_SKIP_ISA_ALIGN 0x8000
-#define PCI_USE__CRS           0x10000
+#define PCI_NO_ROOT_CRS                0x10000
 #define PCI_CHECK_ENABLE_AMD_MMCONF    0x20000
 #define PCI_HAS_IO_ECS         0x40000
 #define PCI_NOASSIGN_ROMS      0x80000

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index c0ecf25..8d898e0 100644 (file)
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -217,7 +217,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
 #endif
        }
 
-       if (bus && (pci_probe & PCI_USE__CRS))
+       if (bus && !(pci_probe & PCI_NO_ROOT_CRS))
                get_current_resources(device, busnum, domain, bus);
        return bus;
 }

diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
index f893d6a..2255f88 100644 (file)
--- a/arch/x86/pci/amd_bus.c
+++ b/arch/x86/pci/amd_bus.c
@@ -101,7 +101,7 @@ void x86_pci_root_bus_res_quirks(struct pci_bus *b)
        struct pci_root_info *info;
 
        /* don't go for it if _CRS is used */
-       if (pci_probe & PCI_USE__CRS)
+       if (!(pci_probe & PCI_NO_ROOT_CRS))
                return;
 
        /* if only one root bus, don't need to anything */

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 2202b62..4740119 100644 (file)
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -515,8 +515,8 @@ char * __devinit  pcibios_setup(char *str)
        } else if (!strcmp(str, "assign-busses")) {
                pci_probe |= PCI_ASSIGN_ALL_BUSSES;
                return NULL;
-       } else if (!strcmp(str, "use_crs")) {
-               pci_probe |= PCI_USE__CRS;
+       } else if (!strcmp(str, "nocrs")) {
+               pci_probe |= PCI_NO_ROOT_CRS;
                return NULL;
        } else if (!strcmp(str, "earlydump")) {
                pci_early_dump_regs = 1;