[PATCH] x86: Fix for cache computation on AMD legacy cpus.
sajan.karumanchi@gmail.com
sajan.karumanchi@gmail.com
Fri Jun 2 13:19:07 GMT 2023
From: Sajan Karumanchi <sajan.karumanchi@amd.com>
Some legacy AMD CPUs and hypervisors have the _cpuid_ '0x8000_001D'
set to Zero, thus resulting in zeroed-out computed cache values.
This patch reintroduces the old way of cache computation as a
failsafe option to handle these exceptions.
Reviewed-by: Premachandra Mallappa <premachandra.mallappa@amd.com>
---
sysdeps/x86/dl-cacheinfo.h | 218 +++++++++++++++++++++++++++++++++----
1 file changed, 194 insertions(+), 24 deletions(-)
diff --git a/sysdeps/x86/dl-cacheinfo.h b/sysdeps/x86/dl-cacheinfo.h
index 877e73d700..1d15b6bcd8 100644
--- a/sysdeps/x86/dl-cacheinfo.h
+++ b/sysdeps/x86/dl-cacheinfo.h
@@ -315,40 +315,203 @@ handle_amd (int name)
{
unsigned int eax;
unsigned int ebx;
- unsigned int ecx;
+ unsigned int ecx = 0;
unsigned int edx;
- unsigned int count = 0x1;
+ unsigned int max_cpuid = 0;
+ unsigned int fn = 0;
/* No level 4 cache (yet). */
if (name > _SC_LEVEL3_CACHE_LINESIZE)
return 0;
- if (name >= _SC_LEVEL3_CACHE_SIZE)
- count = 0x3;
- else if (name >= _SC_LEVEL2_CACHE_SIZE)
- count = 0x2;
- else if (name >= _SC_LEVEL1_DCACHE_SIZE)
- count = 0x0;
+ __cpuid(0x80000000, max_cpuid, ebx, ecx, edx);
+
+ if (max_cpuid >= 0x8000001D)
+ /* Use __cpuid__ '0x8000_001D' to compute cache details. */
+ {
+ unsigned int count = 0x1;
+
+ if (name >= _SC_LEVEL3_CACHE_SIZE)
+ count = 0x3;
+ else if (name >= _SC_LEVEL2_CACHE_SIZE)
+ count = 0x2;
+ else if (name >= _SC_LEVEL1_DCACHE_SIZE)
+ count = 0x0;
+
+ __cpuid_count (0x8000001D, count, eax, ebx, ecx, edx);
+
+ if (ecx != 0)
+ {
+ switch (name)
+ {
+ case _SC_LEVEL1_ICACHE_ASSOC:
+ case _SC_LEVEL1_DCACHE_ASSOC:
+ case _SC_LEVEL2_CACHE_ASSOC:
+ case _SC_LEVEL3_CACHE_ASSOC:
+ return ((ebx >> 22) & 0x3ff) + 1;
+ case _SC_LEVEL1_ICACHE_LINESIZE:
+ case _SC_LEVEL1_DCACHE_LINESIZE:
+ case _SC_LEVEL2_CACHE_LINESIZE:
+ case _SC_LEVEL3_CACHE_LINESIZE:
+ return (ebx & 0xfff) + 1;
+ case _SC_LEVEL1_ICACHE_SIZE:
+ case _SC_LEVEL1_DCACHE_SIZE:
+ case _SC_LEVEL2_CACHE_SIZE:
+ case _SC_LEVEL3_CACHE_SIZE:
+ return (((ebx >> 22) & 0x3ff) + 1) * ((ebx & 0xfff) + 1) * (ecx + 1);
+ default:
+ __builtin_unreachable ();
+ }
+ return -1;
+ }
+ }
+
+ /* Legacy cache computation when __cpuid__ 0x8000_001D is Zero */
+ fn = 0x80000005 + (name >= _SC_LEVEL2_CACHE_SIZE);
+
+ if (max_cpuid < fn)
+ return 0;
+
+ __cpuid (fn, eax, ebx, ecx, edx);
- __cpuid_count (0x8000001D, count, eax, ebx, ecx, edx);
+ if (name < _SC_LEVEL1_DCACHE_SIZE)
+ {
+ name += _SC_LEVEL1_DCACHE_SIZE - _SC_LEVEL1_ICACHE_SIZE;
+ ecx = edx;
+ }
switch (name)
{
- case _SC_LEVEL1_ICACHE_ASSOC:
- case _SC_LEVEL1_DCACHE_ASSOC:
- case _SC_LEVEL2_CACHE_ASSOC:
+ case _SC_LEVEL1_DCACHE_SIZE:
+ return (ecx >> 14) & 0x3fc00;
+
+ case _SC_LEVEL1_DCACHE_ASSOC:
+ ecx >>= 16;
+ if ((ecx & 0xff) == 0xff)
+ {
+ /* Fully associative. */
+ return (ecx << 2) & 0x3fc00;
+ }
+ return ecx & 0xff;
+
+ case _SC_LEVEL1_DCACHE_LINESIZE:
+ return ecx & 0xff;
+
+ case _SC_LEVEL2_CACHE_SIZE:
+ return (ecx & 0xf000) == 0 ? 0 : (ecx >> 6) & 0x3fffc00;
+
+ case _SC_LEVEL2_CACHE_ASSOC:
+ switch ((ecx >> 12) & 0xf)
+ {
+ case 0:
+ case 1:
+ case 2:
+ case 4:
+ return (ecx >> 12) & 0xf;
+ case 6:
+ return 8;
+ case 8:
+ return 16;
+ case 10:
+ return 32;
+ case 11:
+ return 48;
+ case 12:
+ return 64;
+ case 13:
+ return 96;
+ case 14:
+ return 128;
+ case 15:
+ return ((ecx >> 6) & 0x3fffc00) / (ecx & 0xff);
+ default:
+ return 0;
+ }
+
+ case _SC_LEVEL2_CACHE_LINESIZE:
+ return (ecx & 0xf000) == 0 ? 0 : ecx & 0xff;
+
+ case _SC_LEVEL3_CACHE_SIZE:
+ {
+ long int total_l3_cache = 0, l3_cache_per_thread = 0;
+ unsigned int threads = 0;
+ const struct cpu_features *cpu_features;
+
+ if ((edx & 0xf000) == 0)
+ return 0;
+
+ total_l3_cache = (edx & 0x3ffc0000) << 1;
+ cpu_features = __get_cpu_features ();
+
+ /* Figure out the number of logical threads that share L3. */
+ if (max_cpuid >= 0x80000008)
+ {
+ /* Get width of APIC ID. */
+ __cpuid (0x80000008, eax, ebx, ecx, edx);
+ threads = 1 << ((ecx >> 12) & 0x0f);
+ }
+
+ if (threads == 0 || cpu_features->basic.family >= 0x17)
+ {
+ /* If APIC ID width is not available, use logical
+ processor count. */
+ __cpuid (0x00000001, eax, ebx, ecx, edx);
+ if ((edx & (1 << 28)) != 0)
+ threads = (ebx >> 16) & 0xff;
+ }
+
+ /* Cap usage of highest cache level to the number of
+ supported threads. */
+ if (threads > 0)
+ l3_cache_per_thread = total_l3_cache/threads;
+
+ /* Get shared cache per ccx for Zen architectures. */
+ if (cpu_features->basic.family >= 0x17)
+ {
+ long int l3_cache_per_ccx = 0;
+ /* Get number of threads share the L3 cache in CCX. */
+ __cpuid_count (0x8000001D, 0x3, eax, ebx, ecx, edx);
+ unsigned int threads_per_ccx = ((eax >> 14) & 0xfff) + 1;
+ l3_cache_per_ccx = l3_cache_per_thread * threads_per_ccx;
+ return l3_cache_per_ccx;
+ }
+ else
+ {
+ return l3_cache_per_thread;
+ }
+ }
+
case _SC_LEVEL3_CACHE_ASSOC:
- return ecx ? ((ebx >> 22) & 0x3ff) + 1 : 0;
- case _SC_LEVEL1_ICACHE_LINESIZE:
- case _SC_LEVEL1_DCACHE_LINESIZE:
- case _SC_LEVEL2_CACHE_LINESIZE:
+ switch ((edx >> 12) & 0xf)
+ {
+ case 0:
+ case 1:
+ case 2:
+ case 4:
+ return (edx >> 12) & 0xf;
+ case 6:
+ return 8;
+ case 8:
+ return 16;
+ case 10:
+ return 32;
+ case 11:
+ return 48;
+ case 12:
+ return 64;
+ case 13:
+ return 96;
+ case 14:
+ return 128;
+ case 15:
+ return ((edx & 0x3ffc0000) << 1) / (edx & 0xff);
+ default:
+ return 0;
+ }
+
case _SC_LEVEL3_CACHE_LINESIZE:
- return ecx ? (ebx & 0xfff) + 1 : 0;
- case _SC_LEVEL1_ICACHE_SIZE:
- case _SC_LEVEL1_DCACHE_SIZE:
- case _SC_LEVEL2_CACHE_SIZE:
- case _SC_LEVEL3_CACHE_SIZE:
- return ecx ? (((ebx >> 22) & 0x3ff) + 1) * ((ebx & 0xfff) + 1) * (ecx + 1): 0;
+ return (edx & 0xf000) == 0 ? 0 : edx & 0xff;
+
default:
__builtin_unreachable ();
}
@@ -713,8 +876,15 @@ dl_init_cacheinfo (struct cpu_features *cpu_features)
level3_cache_linesize = handle_amd (_SC_LEVEL3_CACHE_LINESIZE);
if (shared <= 0)
- /* No shared L3 cache. All we have is the L2 cache. */
- shared = core;
+ {
+ /* No shared L3 cache. All we have is the L2 cache. */
+ shared = core;
+ }
+ else if (cpu_features->basic.family < 0x17)
+ {
+ /* Account for exclusive L2 and L3 caches. */
+ shared += core;
+ }
}
cpu_features->level1_icache_size = level1_icache_size;
--
2.34.1
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