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authorJesse Barnes <jbarnes@virtuousgeek.org>2009-10-26 13:20:44 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-11-04 08:47:10 -0800
commitac1aa47b131416a6ff37eb1005a0a1d2541aad6c (patch)
tree1d7efa15a16f61664a240520970e729b1a47e4a5 /arch/x86
parent99935a7a59eaca0292c1a5880e10bae03f4a5e3d (diff)
PCI: determine CLS more intelligently
Till now, CLS has been determined either by arch code or as L1_CACHE_BYTES. Only x86 and ia64 set CLS explicitly and x86 doesn't always get it right. On most configurations, the chance is that firmware configures the correct value during boot. This patch makes pci_init() determine CLS by looking at what firmware has configured. It scans all devices and if all non-zero values agree, the value is used. If none is configured or there is a disagreement, pci_dfl_cache_line_size is used. arch can set the dfl value (via PCI_CACHE_LINE_BYTES or pci_dfl_cache_line_size) or override the actual one. ia64, x86 and sparc64 updated to set the default cls instead of the actual one. While at it, declare pci_cache_line_size and pci_dfl_cache_line_size in pci.h and drop private declarations from arch code. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: David Miller <davem@davemloft.net> Acked-by: Greg KH <gregkh@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/pci/common.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 1331fcf2614..fbeec31316c 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -410,8 +410,6 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
return bus;
}
-extern u8 pci_cache_line_size;
-
int __init pcibios_init(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
@@ -426,11 +424,11 @@ int __init pcibios_init(void)
* and P4. It's also good for 386/486s (which actually have 16)
* as quite a few PCI devices do not support smaller values.
*/
- pci_cache_line_size = 32 >> 2;
+ pci_dfl_cache_line_size = 32 >> 2;
if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
- pci_cache_line_size = 64 >> 2; /* K7 & K8 */
+ pci_dfl_cache_line_size = 64 >> 2; /* K7 & K8 */
else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
- pci_cache_line_size = 128 >> 2; /* P4 */
+ pci_dfl_cache_line_size = 128 >> 2; /* P4 */
pcibios_resource_survey();