xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86: apic_is_clustered_box for vsmp

Browse Source 
quad core 8 socket system will have apic id lifting.the apic id range could
be [4, 0x23]. and apic_is_clustered_box will think that need to three clusters
and that is larger than 2. So it is treated as a clustered_box.

and will get:

   Marking TSC unstable due to TSCs unsynchronized

even if the CPUs have X86_FEATURE_CONSTANT_TSC set.

this quick fix will check if the cpu is from AMD.

but vsmp still needs that checking...

this patch is fix to make sure that vsmp not to be passed.

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
2008-02-24 21:36:28 -08:00
committed by Ingo Molnar
parent 34048c9e92
commit f8fffa4583
3 changed files with 28 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
arch/x86/kernel/vsmp_64.c
View File

@@ -72,19 +72,34 @@ static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
}
static int vsmp = -1;
int is_vsmp_box(void)
{
if (vsmp != -1)
return vsmp;
vsmp = 0;
if (!early_pci_allowed())
return vsmp;
/* Check if we are running on a ScaleMP vSMP box */
if (read_pci_config(0, 0x1f, 0, PCI_VENDOR_ID) ==
(PCI_VENDOR_ID_SCALEMP || (PCI_DEVICE_ID_SCALEMP_VSMP_CTL << 16)))
vsmp = 1;
return vsmp;
}
void __init vsmp_init(void)
{
void *address;
unsigned int cap, ctl, cfg;
if (!early_pci_allowed())
if (!is_vsmp_box())
return;
/* Check if we are running on a ScaleMP vSMP box */
if ((read_pci_config_16(0, 0x1f, 0, PCI_VENDOR_ID) !=
PCI_VENDOR_ID_SCALEMP) ||
(read_pci_config_16(0, 0x1f, 0, PCI_DEVICE_ID) !=
PCI_DEVICE_ID_SCALEMP_VSMP_CTL))
if (!early_pci_allowed())
return;
/* If we are, use the distinguished irq functions */