tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
[PATCH] Enable write combining for server works LE rev > 6
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>
authored by
Lee Revell
and committed by
Linus Torvalds
a6954ba2
48c88211
+9
-5
+9
-5
arch/i386/kernel/cpu/mtrr/main.c
+9
-5
arch/i386/kernel/cpu/mtrr/main.c
···
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static int have_wrcomb(void)
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{
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struct pci_dev *dev;
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u8 rev;
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if ((dev = pci_get_class(PCI_CLASS_BRIDGE_HOST << 8, NULL)) != NULL) {
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/* ServerWorks LE chipsets have problems with write-combining
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/* ServerWorks LE chipsets < rev 6 have problems with write-combining
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Don't allow it and leave room for other chipsets to be tagged */
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if (dev->vendor == PCI_VENDOR_ID_SERVERWORKS &&
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dev->device == PCI_DEVICE_ID_SERVERWORKS_LE) {
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printk(KERN_INFO "mtrr: Serverworks LE detected. Write-combining disabled.\n");
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pci_dev_put(dev);
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return 0;
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pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
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if (rev <= 5) {
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printk(KERN_INFO "mtrr: Serverworks LE rev < 6 detected. Write-combining disabled.\n");
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pci_dev_put(dev);
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return 0;
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}
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}
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/* Intel 450NX errata # 23. Non ascending cachline evictions to
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/* Intel 450NX errata # 23. Non ascending cacheline evictions to
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write combining memory may resulting in data corruption */
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if (dev->vendor == PCI_VENDOR_ID_INTEL &&
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dev->device == PCI_DEVICE_ID_INTEL_82451NX) {