forked from rpms/glibc
248 lines
6.5 KiB
Diff
248 lines
6.5 KiB
Diff
commit 103a469dc7755fd9e8ccf362f3dd4c55dc761908
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Author: Sajan Karumanchi <sajan.karumanchi@amd.com>
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Date: Wed Jan 18 18:29:04 2023 +0100
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x86: Cache computation for AMD architecture.
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All AMD architectures cache details will be computed based on
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__cpuid__ `0x8000_001D` and the reference to __cpuid__ `0x8000_0006` will be
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zeroed out for future architectures.
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Reviewed-by: Premachandra Mallappa <premachandra.mallappa@amd.com>
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Conflicts:
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sysdeps/x86/dl-cacheinfo.h
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(missing backport of commit 2d651eb9265d1366d7b9e881bfddd4
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("x86: Move x86 processor cache info to cpu_features"))
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diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
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index 572f753474ee0610..b6f111e6668cc212 100644
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--- a/sysdeps/x86/cacheinfo.h
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+++ b/sysdeps/x86/cacheinfo.h
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@@ -266,10 +266,6 @@ static void
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init_cacheinfo (void)
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{
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/* Find out what brand of processor. */
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- unsigned int ebx;
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- unsigned int ecx;
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- unsigned int edx;
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- int max_cpuid_ex;
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long int data = -1;
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long int shared = -1;
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long int shared_per_thread = -1;
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@@ -303,62 +299,14 @@ init_cacheinfo (void)
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}
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else if (cpu_features->basic.kind == arch_kind_amd)
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{
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- data = handle_amd (_SC_LEVEL1_DCACHE_SIZE);
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- long int core = handle_amd (_SC_LEVEL2_CACHE_SIZE);
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- shared = handle_amd (_SC_LEVEL3_CACHE_SIZE);
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+ data = handle_amd (_SC_LEVEL1_DCACHE_SIZE, cpu_features);
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+ long int core = handle_amd (_SC_LEVEL2_CACHE_SIZE, cpu_features);
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+ shared = handle_amd (_SC_LEVEL3_CACHE_SIZE, cpu_features);
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shared_per_thread = shared;
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- /* Get maximum extended function. */
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- __cpuid (0x80000000, max_cpuid_ex, ebx, ecx, edx);
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-
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if (shared <= 0)
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/* No shared L3 cache. All we have is the L2 cache. */
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shared = core;
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- else
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- {
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- /* Figure out the number of logical threads that share L3. */
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- if (max_cpuid_ex >= 0x80000008)
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- {
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- /* Get width of APIC ID. */
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- __cpuid (0x80000008, max_cpuid_ex, ebx, ecx, edx);
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- threads = 1 << ((ecx >> 12) & 0x0f);
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- }
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-
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- if (threads == 0 || cpu_features->basic.family >= 0x17)
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- {
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- /* If APIC ID width is not available, use logical
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- processor count. */
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- __cpuid (0x00000001, max_cpuid_ex, ebx, ecx, edx);
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-
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- if ((edx & (1 << 28)) != 0)
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- threads = (ebx >> 16) & 0xff;
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- }
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-
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- /* Cap usage of highest cache level to the number of
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- supported threads. */
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- if (threads > 0)
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- shared /= threads;
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-
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- /* Get shared cache per ccx for Zen architectures. */
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- if (cpu_features->basic.family >= 0x17)
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- {
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- unsigned int eax;
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-
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- /* Get number of threads share the L3 cache in CCX. */
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- __cpuid_count (0x8000001D, 0x3, eax, ebx, ecx, edx);
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-
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- unsigned int threads_per_ccx = ((eax >> 14) & 0xfff) + 1;
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- shared *= threads_per_ccx;
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- }
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- else
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- {
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- /* Account for exclusive L2 and L3 caches. */
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- shared += core;
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- }
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- }
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-
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- if (shared_per_thread <= 0)
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- shared_per_thread = shared;
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}
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if (cpu_features->data_cache_size != 0)
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diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h
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index b2b90074b0e98a60..294a7d8bfc564aef 100644
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--- a/sysdeps/x86/dl-cacheinfo.h
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+++ b/sysdeps/x86/dl-cacheinfo.h
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@@ -311,117 +311,47 @@ handle_intel (int name, const struct cpu_features *cpu_features)
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static long int __attribute__ ((noinline))
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-handle_amd (int name)
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+handle_amd (int name, const struct cpu_features *cpu_features)
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{
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unsigned int eax;
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unsigned int ebx;
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unsigned int ecx;
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unsigned int edx;
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- __cpuid (0x80000000, eax, ebx, ecx, edx);
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+ unsigned int count = 0x1;
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/* No level 4 cache (yet). */
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if (name > _SC_LEVEL3_CACHE_LINESIZE)
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return 0;
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- unsigned int fn = 0x80000005 + (name >= _SC_LEVEL2_CACHE_SIZE);
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- if (eax < fn)
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- return 0;
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+ if (name >= _SC_LEVEL3_CACHE_SIZE)
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+ count = 0x3;
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+ else if (name >= _SC_LEVEL2_CACHE_SIZE)
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+ count = 0x2;
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+ else if (name >= _SC_LEVEL1_DCACHE_SIZE)
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+ count = 0x0;
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- __cpuid (fn, eax, ebx, ecx, edx);
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-
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- if (name < _SC_LEVEL1_DCACHE_SIZE)
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- {
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- name += _SC_LEVEL1_DCACHE_SIZE - _SC_LEVEL1_ICACHE_SIZE;
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- ecx = edx;
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- }
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+ __cpuid_count (0x8000001D, count, eax, ebx, ecx, edx);
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switch (name)
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{
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- case _SC_LEVEL1_DCACHE_SIZE:
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- return (ecx >> 14) & 0x3fc00;
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-
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- case _SC_LEVEL1_DCACHE_ASSOC:
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- ecx >>= 16;
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- if ((ecx & 0xff) == 0xff)
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- /* Fully associative. */
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- return (ecx << 2) & 0x3fc00;
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- return ecx & 0xff;
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-
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- case _SC_LEVEL1_DCACHE_LINESIZE:
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- return ecx & 0xff;
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-
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- case _SC_LEVEL2_CACHE_SIZE:
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- return (ecx & 0xf000) == 0 ? 0 : (ecx >> 6) & 0x3fffc00;
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-
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- case _SC_LEVEL2_CACHE_ASSOC:
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- switch ((ecx >> 12) & 0xf)
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- {
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- case 0:
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- case 1:
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- case 2:
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- case 4:
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- return (ecx >> 12) & 0xf;
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- case 6:
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- return 8;
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- case 8:
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- return 16;
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- case 10:
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- return 32;
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- case 11:
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- return 48;
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- case 12:
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- return 64;
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- case 13:
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- return 96;
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- case 14:
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- return 128;
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- case 15:
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- return ((ecx >> 6) & 0x3fffc00) / (ecx & 0xff);
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- default:
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- return 0;
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- }
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- /* NOTREACHED */
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-
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- case _SC_LEVEL2_CACHE_LINESIZE:
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- return (ecx & 0xf000) == 0 ? 0 : ecx & 0xff;
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-
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- case _SC_LEVEL3_CACHE_SIZE:
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- return (edx & 0xf000) == 0 ? 0 : (edx & 0x3ffc0000) << 1;
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-
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- case _SC_LEVEL3_CACHE_ASSOC:
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- switch ((edx >> 12) & 0xf)
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- {
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- case 0:
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- case 1:
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- case 2:
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- case 4:
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- return (edx >> 12) & 0xf;
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- case 6:
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- return 8;
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- case 8:
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- return 16;
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- case 10:
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- return 32;
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- case 11:
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- return 48;
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- case 12:
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- return 64;
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- case 13:
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- return 96;
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- case 14:
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- return 128;
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- case 15:
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- return ((edx & 0x3ffc0000) << 1) / (edx & 0xff);
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- default:
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- return 0;
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- }
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- /* NOTREACHED */
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-
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- case _SC_LEVEL3_CACHE_LINESIZE:
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- return (edx & 0xf000) == 0 ? 0 : edx & 0xff;
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-
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- default:
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- assert (! "cannot happen");
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+ case _SC_LEVEL1_ICACHE_ASSOC:
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+ case _SC_LEVEL1_DCACHE_ASSOC:
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+ case _SC_LEVEL2_CACHE_ASSOC:
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+ case _SC_LEVEL3_CACHE_ASSOC:
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+ return ecx?((ebx >> 22) & 0x3ff) + 1 : 0;
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+ case _SC_LEVEL1_ICACHE_LINESIZE:
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+ case _SC_LEVEL1_DCACHE_LINESIZE:
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+ case _SC_LEVEL2_CACHE_LINESIZE:
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+ case _SC_LEVEL3_CACHE_LINESIZE:
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+ return ecx?(ebx & 0xfff) + 1 : 0;
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+ case _SC_LEVEL1_ICACHE_SIZE:
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+ case _SC_LEVEL1_DCACHE_SIZE:
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+ case _SC_LEVEL2_CACHE_SIZE:
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+ case _SC_LEVEL3_CACHE_SIZE:
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+ return ecx?(((ebx >> 22) & 0x3ff) + 1)*((ebx & 0xfff) + 1)\
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+ *(ecx + 1):0;
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+ default:
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+ assert (! "cannot happen");
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}
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return -1;
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}
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