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authorShaohua Li <shaohua.li@intel.com>2006-03-27 01:15:24 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:44:44 -0800
commitb06be912a3ad68c69dba0ed6e92723140020e392 (patch)
tree4de1f2c2804ae3230e14e94d3f33a14467889233
parent0806903316d516a3b3851c51cea5c71724d9051d (diff)
[PATCH] x86: don't use cpuid.2 to determine cache info if cpuid.4 is supported
Don't use cpuid.2 to determine cache info if cpuid.4 is supported. The exception is P4 trace cache. We always use cpuid.2 to get trace cache under P4. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/kernel/cpu/intel_cacheinfo.c69
1 files changed, 41 insertions, 28 deletions
diff --git a/arch/i386/kernel/cpu/intel_cacheinfo.c b/arch/i386/kernel/cpu/intel_cacheinfo.c
index 7e7fd4e67dd0..9df87b03612c 100644
--- a/arch/i386/kernel/cpu/intel_cacheinfo.c
+++ b/arch/i386/kernel/cpu/intel_cacheinfo.c
@@ -225,11 +225,19 @@ unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
}
}
}
- if (c->cpuid_level > 1) {
+ /*
+ * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
+ * trace cache
+ */
+ if ((num_cache_leaves == 0 || c->x86 == 15) && c->cpuid_level > 1) {
/* supports eax=2 call */
int i, j, n;
int regs[4];
unsigned char *dp = (unsigned char *)regs;
+ int only_trace = 0;
+
+ if (num_cache_leaves != 0 && c->x86 == 15)
+ only_trace = 1;
/* Number of times to iterate */
n = cpuid_eax(2) & 0xFF;
@@ -251,6 +259,8 @@ unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
while (cache_table[k].descriptor != 0)
{
if (cache_table[k].descriptor == des) {
+ if (only_trace && cache_table[k].cache_type != LVL_TRACE)
+ break;
switch (cache_table[k].cache_type) {
case LVL_1_INST:
l1i += cache_table[k].size;
@@ -276,43 +286,46 @@ unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c)
}
}
}
+ }
- if (new_l1d)
- l1d = new_l1d;
+ if (new_l1d)
+ l1d = new_l1d;
- if (new_l1i)
- l1i = new_l1i;
+ if (new_l1i)
+ l1i = new_l1i;
- if (new_l2) {
- l2 = new_l2;
+ if (new_l2) {
+ l2 = new_l2;
#ifdef CONFIG_SMP
- cpu_llc_id[cpu] = l2_id;
+ cpu_llc_id[cpu] = l2_id;
#endif
- }
+ }
- if (new_l3) {
- l3 = new_l3;
+ if (new_l3) {
+ l3 = new_l3;
#ifdef CONFIG_SMP
- cpu_llc_id[cpu] = l3_id;
+ cpu_llc_id[cpu] = l3_id;
#endif
- }
-
- if ( trace )
- printk (KERN_INFO "CPU: Trace cache: %dK uops", trace);
- else if ( l1i )
- printk (KERN_INFO "CPU: L1 I cache: %dK", l1i);
- if ( l1d )
- printk(", L1 D cache: %dK\n", l1d);
- else
- printk("\n");
- if ( l2 )
- printk(KERN_INFO "CPU: L2 cache: %dK\n", l2);
- if ( l3 )
- printk(KERN_INFO "CPU: L3 cache: %dK\n", l3);
-
- c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
}
+ if (trace)
+ printk (KERN_INFO "CPU: Trace cache: %dK uops", trace);
+ else if ( l1i )
+ printk (KERN_INFO "CPU: L1 I cache: %dK", l1i);
+
+ if (l1d)
+ printk(", L1 D cache: %dK\n", l1d);
+ else
+ printk("\n");
+
+ if (l2)
+ printk(KERN_INFO "CPU: L2 cache: %dK\n", l2);
+
+ if (l3)
+ printk(KERN_INFO "CPU: L3 cache: %dK\n", l3);
+
+ c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
+
return l2;
}