[PATCH 2/4] x86, cacheinfo: Determine number of cache leafs using CPUID 0x8000001d on AMD

[Andreas Herrmann]

CPUID 0x8000001d works quite similar to Intels' CPUID function 4.
Use it to determine number of cache leafs.

Signed-off-by: Andreas Herrmann <andreas.herrma...@amd.com>
---
 arch/x86/include/asm/processor.h      |    2 +-
 arch/x86/kernel/cpu/amd.c             |    7 +------
 arch/x86/kernel/cpu/intel_cacheinfo.c |   28 +++++++++++++++++++++++-----
 3 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index b98c0d9..4bfa500 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -187,7 +187,7 @@ extern void print_cpu_info(struct cpuinfo_x86 *);
 void print_cpu_msr(struct cpuinfo_x86 *);
 extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
-extern unsigned short num_cache_leaves;
+extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
 
 extern void detect_extended_topology(struct cpuinfo_x86 *c);
 extern void detect_ht(struct cpuinfo_x86 *c);
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 64e9ad4..a8538e6 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -643,12 +643,7 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
        detect_ht(c);
 #endif
 
-       if (c->extended_cpuid_level >= 0x80000006) {
-               if (cpuid_edx(0x80000006) & 0xf000)
-                       num_cache_leaves = 4;
-               else
-                       num_cache_leaves = 3;
-       }
+       init_amd_cacheinfo(c);
 
        if (c->x86 >= 0xf)
                set_cpu_cap(c, X86_FEATURE_K8);
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c 
b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 93c5451..8ce7a83 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++;
                }
 
-- 
1.7.8.6


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