提交 2b091875 编写于 作者: S Siddha, Suresh B 提交者: Linus Torvalds

[PATCH] x86_64: x86_64/i386 fix Intel cache detection code assumption about threads sharing

Fix the Intel cache detection code assumption that number of threads
sharing the cache will either be equal to number of HT or core siblings.

This also cleans up the code in general a bit.
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 94605eff
......@@ -293,29 +293,45 @@ static struct _cpuid4_info *cpuid4_info[NR_CPUS];
#ifdef CONFIG_SMP
static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
{
struct _cpuid4_info *this_leaf;
struct _cpuid4_info *this_leaf, *sibling_leaf;
unsigned long num_threads_sharing;
#ifdef CONFIG_X86_HT
struct cpuinfo_x86 *c = cpu_data + cpu;
#endif
int index_msb, i;
struct cpuinfo_x86 *c = cpu_data;
this_leaf = CPUID4_INFO_IDX(cpu, index);
num_threads_sharing = 1 + this_leaf->eax.split.num_threads_sharing;
if (num_threads_sharing == 1)
cpu_set(cpu, this_leaf->shared_cpu_map);
#ifdef CONFIG_X86_HT
else if (num_threads_sharing == smp_num_siblings)
this_leaf->shared_cpu_map = cpu_sibling_map[cpu];
else if (num_threads_sharing == (c->x86_max_cores * smp_num_siblings))
this_leaf->shared_cpu_map = cpu_core_map[cpu];
else
printk(KERN_DEBUG "Number of CPUs sharing cache didn't match "
"any known set of CPUs\n");
#endif
else {
index_msb = get_count_order(num_threads_sharing);
for_each_online_cpu(i) {
if (c[i].apicid >> index_msb ==
c[cpu].apicid >> index_msb) {
cpu_set(i, this_leaf->shared_cpu_map);
if (i != cpu && cpuid4_info[i]) {
sibling_leaf = CPUID4_INFO_IDX(i, index);
cpu_set(cpu, sibling_leaf->shared_cpu_map);
}
}
}
}
}
static void __devinit cache_remove_shared_cpu_map(unsigned int cpu, int index)
{
struct _cpuid4_info *this_leaf, *sibling_leaf;
int sibling;
this_leaf = CPUID4_INFO_IDX(cpu, index);
for_each_cpu_mask(sibling, this_leaf->shared_cpu_map) {
sibling_leaf = CPUID4_INFO_IDX(sibling, index);
cpu_clear(cpu, sibling_leaf->shared_cpu_map);
}
}
#else
static void __init cache_shared_cpu_map_setup(unsigned int cpu, int index) {}
static void __init cache_remove_shared_cpu_map(unsigned int cpu, int index) {}
#endif
static void free_cache_attributes(unsigned int cpu)
......@@ -574,8 +590,10 @@ static void __cpuexit cache_remove_dev(struct sys_device * sys_dev)
unsigned int cpu = sys_dev->id;
unsigned long i;
for (i = 0; i < num_cache_leaves; i++)
for (i = 0; i < num_cache_leaves; i++) {
cache_remove_shared_cpu_map(cpu, i);
kobject_unregister(&(INDEX_KOBJECT_PTR(cpu,i)->kobj));
}
kobject_unregister(cache_kobject[cpu]);
cpuid4_cache_sysfs_exit(cpu);
return;
......
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