Messages in this thread Patch in this message | | | Subject | [PATCH] don't use cpuid.2 to determine cache info if cpuid.4 is supported | From | Shaohua Li <> | Date | Tue, 14 Feb 2006 14:51:07 +0800 |
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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> ---
linux-2.6.16-rc2-root/arch/i386/kernel/cpu/intel_cacheinfo.c | 63 +++++------ 1 files changed, 30 insertions(+), 33 deletions(-)
diff -puN arch/i386/kernel/cpu/intel_cacheinfo.c arch/i386/kernel/cpu/intel_cacheinfo.c --- linux-2.6.16-rc2/arch/i386/kernel/cpu/intel_cacheinfo.c 2006-02-10 09:54:21.000000000 +0800 +++ linux-2.6.16-rc2-root/arch/i386/kernel/cpu/intel_cacheinfo.c 2006-02-13 11:44:07.000000000 +0800 @@ -170,8 +170,7 @@ static int __init find_num_cache_leaves( unsigned int __cpuinit init_intel_cacheinfo(struct cpuinfo_x86 *c) { unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0; /* Cache sizes */ - unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */ - unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */ + int i; if (c->cpuid_level > 4) { static int is_initialized; @@ -197,16 +196,16 @@ unsigned int __cpuinit init_intel_cachei case 1: if (this_leaf.eax.split.type == CACHE_TYPE_DATA) - new_l1d = this_leaf.size/1024; + l1d = this_leaf.size/1024; else if (this_leaf.eax.split.type == CACHE_TYPE_INST) - new_l1i = this_leaf.size/1024; + l1i = this_leaf.size/1024; break; case 2: - new_l2 = this_leaf.size/1024; + l2 = this_leaf.size/1024; break; case 3: - new_l3 = this_leaf.size/1024; + l3 = this_leaf.size/1024; break; default: break; @@ -214,11 +213,19 @@ unsigned int __cpuinit init_intel_cachei } } } - 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; @@ -240,6 +247,8 @@ unsigned int __cpuinit init_intel_cachei 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; @@ -265,34 +274,22 @@ unsigned int __cpuinit init_intel_cachei } } } + } - if (new_l1d) - l1d = new_l1d; - - if (new_l1i) - l1i = new_l1i; - - if (new_l2) - l2 = new_l2; - - if (new_l3) - l3 = new_l3; - - 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); + 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)); - } + c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d)); return l2; } _
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