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x86: enable PAT for amd k8 and fam10h 

make known_pat_cpu to think amd k8 and fam10h is ok too.

also make tom2 below to be WRBACK

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-03-24 16:02:01 -07:00 committed by Ingo Molnar
parent 52783fa8d6
commit 35605a1027
4 changed files with 25 additions and 1 deletions
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17
arch/x86/kernel/cpu/mtrr/generic.c
View File

@ -37,6 +37,7 @@ static struct fixed_range_block fixed_range_blocks[] = {
static unsigned long smp_changes_mask;
static struct mtrr_state mtrr_state = {};
static int mtrr_state_set;
static u64 tom2;
#undef MODULE_PARAM_PREFIX
#define MODULE_PARAM_PREFIX "mtrr."
@ -138,6 +139,11 @@ u8 mtrr_type_lookup(u64 start, u64 end)
}
}
if (tom2) {
if (start >= (1ULL<<32) && (end < tom2))
return MTRR_TYPE_WRBACK;
}
if (prev_match != 0xFF)
return prev_match;
@ -206,6 +212,15 @@ void __init get_mtrr_state(void)
mtrr_state.def_type = (lo & 0xff);
mtrr_state.enabled = (lo & 0xc00) >> 10;
if (amd_special_default_mtrr()) {
unsigned lo, hi;
/* TOP_MEM2 */
rdmsr(MSR_K8_TOP_MEM2, lo, hi);
tom2 = hi;
tom2 <<= 32;
tom2 |= lo;
tom2 &= 0xffffff8000000ULL;
}
if (mtrr_show) {
int high_width;
@ -236,6 +251,8 @@ void __init get_mtrr_state(void)
else
printk(KERN_INFO "MTRR %u disabled\n", i);
}
if (tom2)
printk(KERN_INFO "TOM2: %016lx aka %ldM\n", tom2, tom2>>20);
}
mtrr_state_set = 1;

2
arch/x86/kernel/cpu/mtrr/main.c
View File

@ -627,7 +627,7 @@ early_param("disable_mtrr_trim", disable_mtrr_trim_setup);
#define Tom2Enabled (1U << 21)
#define Tom2ForceMemTypeWB (1U << 22)
static __init int amd_special_default_mtrr(void)
int __init amd_special_default_mtrr(void)
{
u32 l, h;

6
arch/x86/mm/pat.c
View File

@ -47,6 +47,12 @@ static int pat_known_cpu(void)
return 1;
}
}
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
boot_cpu_data.x86 >= 0xf && boot_cpu_data.x86 <= 0x11) {
if (cpu_has_pat) {
return 1;
}
}
pat_wc_enabled = 0;
printk(KERN_INFO "CPU and/or kernel does not support PAT.\n");

1
include/asm-x86/mtrr.h
View File

@ -99,6 +99,7 @@ extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
extern void mtrr_ap_init(void);
extern void mtrr_bp_init(void);
extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
extern int amd_special_default_mtrr(void);
# else
static inline u8 mtrr_type_lookup(u64 addr, u64 end)
{