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[PATCH] Enable write combining for server works LE rev > 6

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Enable write combining for server works LE rev > 6 per
http://www.ussg.iu.edu/hypermail/linux/kernel/0104.3/1007.html

Signed-Off-By: Lee Revell <rlrevell@joe-job.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Lee Revell 2005-05-01 08:58:49 -07:00 committed by Linus Torvalds
parent 48c88211a6
commit a6954ba2e8
1 changed files with 9 additions and 5 deletions
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14
arch/i386/kernel/cpu/mtrr/main.c
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@ -72,17 +72,21 @@ void set_mtrr_ops(struct mtrr_ops * ops)
static int have_wrcomb(void) static int have_wrcomb(void)
{ {
struct pci_dev *dev; struct pci_dev *dev;
u8 rev;
if ((dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL)) != NULL) { if ((dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL)) != NULL) {
/* ServerWorks LE chipsets have problems with write-combining /* ServerWorks LE chipsets < rev 6 have problems with write-combining
Don't allow it and leave room for other chipsets to be tagged */ Don't allow it and leave room for other chipsets to be tagged */
if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS && if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
dev->device == PCI_DEVICE_ID_SERVERWORKS_LE) { dev->device == PCI_DEVICE_ID_SERVERWORKS_LE) {
printk(KERN_INFO "mtrr: Serverworks LE detected. Write-combining disabled.\n"); pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
pci_dev_put(dev); if (rev <= 5) {
return 0; printk(KERN_INFO "mtrr: Serverworks LE rev < 6 detected. Write-combining disabled.\n");
pci_dev_put(dev);
return 0;
}
} }
/* Intel 450NX errata # 23. Non ascending cachline evictions to /* Intel 450NX errata # 23. Non ascending cacheline evictions to
write combining memory may resulting in data corruption */ write combining memory may resulting in data corruption */
if (dev->vendor == PCI_VENDOR_ID_INTEL && if (dev->vendor == PCI_VENDOR_ID_INTEL &&
dev->device == PCI_DEVICE_ID_INTEL_82451NX) { dev->device == PCI_DEVICE_ID_INTEL_82451NX) {