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[v0.82][BUGFIX] Using 0x80000006 in new AMD CPUs outputs wrong L3 size since it reports the full size instead the size of a single L3. Use old method just when is necessary

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Dr-Noob
2020-11-21 16:37:51 +01:00
parent b978ddc83d
commit e4a4e13d56
1 changed files with 108 additions and 97 deletions
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69
src/x86/cpuid.c
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@@ -326,7 +326,8 @@ struct cpuInfo* get_cpu_info() {
return cpu;
}
bool get_cache_topology_amd(struct topology* topo) {
bool get_cache_topology_amd(struct cpuInfo* cpu, struct topology* topo) {
if(cpu->maxExtendedLevels >= 0x8000001D) {
uint32_t i, eax, ebx, ecx, edx, num_sharing_cache, cache_type, cache_level;
i = 0;
@@ -382,6 +383,20 @@ bool get_cache_topology_amd(struct topology* topo) {
i++;
} while (cache_type > 0);
}
else {
printWarn("Can't read topology information from cpuid (needed extended level is 0x%.8X, max is 0x%.8X). Guessing cache sizes", 0x8000001D, cpu->maxExtendedLevels);
topo->cach->L1i->num_caches = topo->physical_cores;
topo->cach->L1d->num_caches = topo->physical_cores;
if(topo->cach->L3->exists) {
topo->cach->L2->num_caches = topo->physical_cores;
topo->cach->L3->num_caches = 1;
}
else {
topo->cach->L2->num_caches = 1;
}
}
return true;
}
@@ -465,23 +480,7 @@ struct topology* get_topology_info(struct cpuInfo* cpu, struct cache* cach) {
else
topo->sockets = topo->total_cores / topo->physical_cores;
if(cpu->maxExtendedLevels >= 0x8000001D) {
if(!get_cache_topology_amd(topo))
return NULL;
}
else {
printWarn("Can't read topology information from cpuid (needed extended level is 0x%.8X, max is 0x%.8X). Guessing cache sizes", 0x8000001D, cpu->maxExtendedLevels);
topo->cach->L1i->num_caches = topo->physical_cores;
topo->cach->L1d->num_caches = topo->physical_cores;
if(topo->cach->L3->exists) {
topo->cach->L2->num_caches = topo->physical_cores;
topo->cach->L3->num_caches = 1;
}
else {
topo->cach->L2->num_caches = 1;
}
}
get_cache_topology_amd(cpu, topo);
break;
@@ -493,15 +492,15 @@ struct topology* get_topology_info(struct cpuInfo* cpu, struct cache* cach) {
return topo;
}
struct cache* get_cache_info_amd(struct cache* cach) {
struct cache* get_cache_info_amd_fallback(struct cache* cach) {
uint32_t eax = 0x80000005;
uint32_t ebx = 0;
uint32_t ecx = 0;
uint32_t edx = 0;
cpuid(&eax, &ebx, &ecx, &edx);
cach->L1i->size = (ecx >> 24) * 1024;
cach->L1d->size = (edx >> 24) * 1024;
cach->L1d->size = (ecx >> 24) * 1024;
cach->L1i->size = (edx >> 24) * 1024;
eax = 0x80000006;
cpuid(&eax, &ebx, &ecx, &edx);
@@ -522,16 +521,16 @@ struct cache* get_cache_info_amd(struct cache* cach) {
return cach;
}
struct cache* get_cache_info_intel(struct cache* cach) {
struct cache* get_cache_info_general(struct cache* cach, uint32_t level) {
uint32_t eax = 0;
uint32_t ebx = 0;
uint32_t ecx = 0;
uint32_t edx = 0;
int i=0;
int32_t cache_type;
do {
eax = 0x00000004; // get cache info
eax = level; // get cache info
ebx = 0;
ecx = i; // cache id
edx = 0;
@@ -602,27 +601,39 @@ struct cache* get_cache_info(struct cpuInfo* cpu) {
init_cache_struct(cach);
uint32_t level;
// We use standart 0x00000004 for Intel
// We use extended 0x80000006 for AMD
// We use extended 0x8000001D for AMD
// or 0x80000005/6 for old AMD
if(cpu->cpu_vendor == CPU_VENDOR_INTEL) {
level = 0x00000004;
if(cpu->maxLevels < level) {
printErr("Can't read cache information from cpuid (needed level is %d, max is %d)", level, cpu->maxLevels);
return NULL;
}
get_cache_info_intel(cach);
else {
cach = get_cache_info_general(cach, level);
}
}
else {
level = 0x8000001D;
if(cpu->maxExtendedLevels < level) {
printWarn("Can't read cache information from cpuid (needed extended level is %d, max is %d)", level, cpu->maxExtendedLevels);
level = 0x80000006;
if(cpu->maxExtendedLevels < level) {
printErr("Can't read cache information from cpuid (needed extended level is %d, max is %d)", level, cpu->maxExtendedLevels);
printErr("Can't read cache information from cpuid using old method (needed extended level is %d, max is %d)", level, cpu->maxExtendedLevels);
return NULL;
}
get_cache_info_amd(cach);
printWarn("Fallback to old method using %d and %d", level-1, level);
cach = get_cache_info_amd_fallback(cach);
}
else {
cach = get_cache_info_general(cach, level);
}
}
// Sanity checks. If we read values greater than this, they can't be valid ones
// Values were chosen by me
// The values were chosen by me
if(cach->L1i->size > 64 * 1024) {
printBug("Invalid L1i size: %dKB", cach->L1i->size/1024);
return NULL;