diff options
| author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2012-10-19 10:59:33 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-13 11:22:29 -0800 |
| commit | 04a1541828ea223169eb44a336bfad8ec0dfb46a (patch) | |
| tree | a670df6305266009a488f52ad763eb5a13767abf /arch/x86/kernel/cpu/intel_cacheinfo.c | |
| parent | 193f3fcb3ab769bab4a2b9fa181eef3e5699a352 (diff) | |
x86, cacheinfo: Determine number of cache leafs using CPUID 0x8000001d on AMD
CPUID 0x8000001d works quite similar to Intels' CPUID function 4.
Use it to determine number of cache leafs.
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Link: http://lkml.kernel.org/r/20121019085933.GE26718@alberich
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/cpu/intel_cacheinfo.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_cacheinfo.c | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c index 93c5451bdd52..8ce7a83252f9 100644 --- a/arch/x86/kernel/cpu/intel_cacheinfo.c +++ b/arch/x86/kernel/cpu/intel_cacheinfo.c @@ -557,21 +557,39 @@ __cpuinit cpuid4_cache_lookup_regs(int index, return 0; } -static int __cpuinit find_num_cache_leaves(void) +static int __cpuinit find_num_cache_leaves(struct cpuinfo_x86 *c) { - unsigned int eax, ebx, ecx, edx; + unsigned int eax, ebx, ecx, edx, op; union _cpuid4_leaf_eax cache_eax; int i = -1; + if (c->x86_vendor == X86_VENDOR_AMD) + op = 0x8000001d; + else + op = 4; + do { ++i; - /* Do cpuid(4) loop to find out num_cache_leaves */ - cpuid_count(4, i, &eax, &ebx, &ecx, &edx); + /* Do cpuid(op) loop to find out num_cache_leaves */ + cpuid_count(op, i, &eax, &ebx, &ecx, &edx); cache_eax.full = eax; } while (cache_eax.split.type != CACHE_TYPE_NULL); return i; } +void __cpuinit init_amd_cacheinfo(struct cpuinfo_x86 *c) +{ + + if (cpu_has_topoext) { + num_cache_leaves = find_num_cache_leaves(c); + } else if (c->extended_cpuid_level >= 0x80000006) { + if (cpuid_edx(0x80000006) & 0xf000) + num_cache_leaves = 4; + else + num_cache_leaves = 3; + } +} + unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c) { /* Cache sizes */ @@ -588,7 +606,7 @@ unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c) if (is_initialized == 0) { /* Init num_cache_leaves from boot CPU */ - num_cache_leaves = find_num_cache_leaves(); + num_cache_leaves = find_num_cache_leaves(c); is_initialized++; } |