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linux/arch/x86/kernel/cpu/cpuid_0x2_table.c

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x86/cpu: Consolidate CPUID leaf 0x2 tables CPUID leaf 0x2 describes TLBs and caches. So there are two tables with the respective descriptor constants in intel.c and cacheinfo.c. The tables occupy almost 600 byte and require a loop based lookup for each variant. Combining them into one table occupies exactly 1k rodata and allows to get rid of the loop based lookup by just using the descriptor byte provided by CPUID leaf 0x2 as index into the table, which simplifies the code and reduces text size. The conversion of the intel.c and cacheinfo.c code is done separately. [ darwi: Actually define struct leaf_0x2_table. Tab-align all of cpuid_0x2_table[] mapping entries. Define needed SZ_* macros at <linux/sizes.h> instead (merged commit.) Use CACHE_L1_{INST,DATA} as names for L1 cache descriptor types. Set descriptor 0x63 type as TLB_DATA_1G_2M_4M and explain why. Use enums for cache and TLB descriptor types (parent commits.) Start enum types at 1 since type 0 is reserved for unknown descriptors. Ensure that cache and TLB enum type values do not intersect. Add leaf 0x2 table accessor for_each_leaf_0x2_entry() + documentation. ] Co-developed-by: Ahmed S. Darwish <darwi@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20250324133324.23458-21-darwi@linutronix.de
2025-03-24 14:33:15 +01:00
// SPDX-License-Identifier: GPL-2.0
#include <linux/sizes.h>
#include <asm/cpuid/types.h>
#include "cpu.h"
#define CACHE_ENTRY(_desc, _type, _size) \
[_desc] = { \
.c_type = (_type), \
.c_size = (_size) / SZ_1K, \
}
#define TLB_ENTRY(_desc, _type, _entries) \
[_desc] = { \
.t_type = (_type), \
.entries = (_entries), \
}
const struct leaf_0x2_table cpuid_0x2_table[256] = {
CACHE_ENTRY(0x06, CACHE_L1_INST, SZ_8K ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x08, CACHE_L1_INST, SZ_16K ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x09, CACHE_L1_INST, SZ_32K ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0x0a, CACHE_L1_DATA, SZ_8K ), /* 2 way set assoc, 32 byte line size */
CACHE_ENTRY(0x0c, CACHE_L1_DATA, SZ_16K ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x0d, CACHE_L1_DATA, SZ_16K ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0x0e, CACHE_L1_DATA, SZ_24K ), /* 6-way set assoc, 64 byte line size */
CACHE_ENTRY(0x21, CACHE_L2, SZ_256K ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0x22, CACHE_L3, SZ_512K ), /* 4-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x23, CACHE_L3, SZ_1M ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x25, CACHE_L3, SZ_2M ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x29, CACHE_L3, SZ_4M ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x2c, CACHE_L1_DATA, SZ_32K ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0x30, CACHE_L1_INST, SZ_32K ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0x39, CACHE_L2, SZ_128K ), /* 4-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x3a, CACHE_L2, SZ_192K ), /* 6-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x3b, CACHE_L2, SZ_128K ), /* 2-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x3c, CACHE_L2, SZ_256K ), /* 4-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x3d, CACHE_L2, SZ_384K ), /* 6-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x3e, CACHE_L2, SZ_512K ), /* 4-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x3f, CACHE_L2, SZ_256K ), /* 2-way set assoc, 64 byte line size */
CACHE_ENTRY(0x41, CACHE_L2, SZ_128K ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x42, CACHE_L2, SZ_256K ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x43, CACHE_L2, SZ_512K ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x44, CACHE_L2, SZ_1M ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x45, CACHE_L2, SZ_2M ), /* 4-way set assoc, 32 byte line size */
CACHE_ENTRY(0x46, CACHE_L3, SZ_4M ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0x47, CACHE_L3, SZ_8M ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0x48, CACHE_L2, SZ_3M ), /* 12-way set assoc, 64 byte line size */
CACHE_ENTRY(0x49, CACHE_L3, SZ_4M ), /* 16-way set assoc, 64 byte line size */
CACHE_ENTRY(0x4a, CACHE_L3, SZ_6M ), /* 12-way set assoc, 64 byte line size */
CACHE_ENTRY(0x4b, CACHE_L3, SZ_8M ), /* 16-way set assoc, 64 byte line size */
CACHE_ENTRY(0x4c, CACHE_L3, SZ_12M ), /* 12-way set assoc, 64 byte line size */
CACHE_ENTRY(0x4d, CACHE_L3, SZ_16M ), /* 16-way set assoc, 64 byte line size */
CACHE_ENTRY(0x4e, CACHE_L2, SZ_6M ), /* 24-way set assoc, 64 byte line size */
CACHE_ENTRY(0x60, CACHE_L1_DATA, SZ_16K ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x66, CACHE_L1_DATA, SZ_8K ), /* 4-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x67, CACHE_L1_DATA, SZ_16K ), /* 4-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x68, CACHE_L1_DATA, SZ_32K ), /* 4-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x78, CACHE_L2, SZ_1M ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0x79, CACHE_L2, SZ_128K ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x7a, CACHE_L2, SZ_256K ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x7b, CACHE_L2, SZ_512K ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x7c, CACHE_L2, SZ_1M ), /* 8-way set assoc, sectored cache, 64 byte line size */
CACHE_ENTRY(0x7d, CACHE_L2, SZ_2M ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0x7f, CACHE_L2, SZ_512K ), /* 2-way set assoc, 64 byte line size */
CACHE_ENTRY(0x80, CACHE_L2, SZ_512K ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0x82, CACHE_L2, SZ_256K ), /* 8-way set assoc, 32 byte line size */
CACHE_ENTRY(0x83, CACHE_L2, SZ_512K ), /* 8-way set assoc, 32 byte line size */
CACHE_ENTRY(0x84, CACHE_L2, SZ_1M ), /* 8-way set assoc, 32 byte line size */
CACHE_ENTRY(0x85, CACHE_L2, SZ_2M ), /* 8-way set assoc, 32 byte line size */
CACHE_ENTRY(0x86, CACHE_L2, SZ_512K ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0x87, CACHE_L2, SZ_1M ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0xd0, CACHE_L3, SZ_512K ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0xd1, CACHE_L3, SZ_1M ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0xd2, CACHE_L3, SZ_2M ), /* 4-way set assoc, 64 byte line size */
CACHE_ENTRY(0xd6, CACHE_L3, SZ_1M ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0xd7, CACHE_L3, SZ_2M ), /* 8-way set assoc, 64 byte line size */
CACHE_ENTRY(0xd8, CACHE_L3, SZ_4M ), /* 12-way set assoc, 64 byte line size */
CACHE_ENTRY(0xdc, CACHE_L3, SZ_2M ), /* 12-way set assoc, 64 byte line size */
CACHE_ENTRY(0xdd, CACHE_L3, SZ_4M ), /* 12-way set assoc, 64 byte line size */
CACHE_ENTRY(0xde, CACHE_L3, SZ_8M ), /* 12-way set assoc, 64 byte line size */
CACHE_ENTRY(0xe2, CACHE_L3, SZ_2M ), /* 16-way set assoc, 64 byte line size */
CACHE_ENTRY(0xe3, CACHE_L3, SZ_4M ), /* 16-way set assoc, 64 byte line size */
CACHE_ENTRY(0xe4, CACHE_L3, SZ_8M ), /* 16-way set assoc, 64 byte line size */
CACHE_ENTRY(0xea, CACHE_L3, SZ_12M ), /* 24-way set assoc, 64 byte line size */
CACHE_ENTRY(0xeb, CACHE_L3, SZ_18M ), /* 24-way set assoc, 64 byte line size */
CACHE_ENTRY(0xec, CACHE_L3, SZ_24M ), /* 24-way set assoc, 64 byte line size */
TLB_ENTRY( 0x01, TLB_INST_4K, 32 ), /* TLB_INST 4 KByte pages, 4-way set associative */
TLB_ENTRY( 0x02, TLB_INST_4M, 2 ), /* TLB_INST 4 MByte pages, full associative */
TLB_ENTRY( 0x03, TLB_DATA_4K, 64 ), /* TLB_DATA 4 KByte pages, 4-way set associative */
TLB_ENTRY( 0x04, TLB_DATA_4M, 8 ), /* TLB_DATA 4 MByte pages, 4-way set associative */
TLB_ENTRY( 0x05, TLB_DATA_4M, 32 ), /* TLB_DATA 4 MByte pages, 4-way set associative */
TLB_ENTRY( 0x0b, TLB_INST_4M, 4 ), /* TLB_INST 4 MByte pages, 4-way set associative */
TLB_ENTRY( 0x4f, TLB_INST_4K, 32 ), /* TLB_INST 4 KByte pages */
TLB_ENTRY( 0x50, TLB_INST_ALL, 64 ), /* TLB_INST 4 KByte and 2-MByte or 4-MByte pages */
TLB_ENTRY( 0x51, TLB_INST_ALL, 128 ), /* TLB_INST 4 KByte and 2-MByte or 4-MByte pages */
TLB_ENTRY( 0x52, TLB_INST_ALL, 256 ), /* TLB_INST 4 KByte and 2-MByte or 4-MByte pages */
TLB_ENTRY( 0x55, TLB_INST_2M_4M, 7 ), /* TLB_INST 2-MByte or 4-MByte pages, fully associative */
TLB_ENTRY( 0x56, TLB_DATA0_4M, 16 ), /* TLB_DATA0 4 MByte pages, 4-way set associative */
TLB_ENTRY( 0x57, TLB_DATA0_4K, 16 ), /* TLB_DATA0 4 KByte pages, 4-way associative */
TLB_ENTRY( 0x59, TLB_DATA0_4K, 16 ), /* TLB_DATA0 4 KByte pages, fully associative */
TLB_ENTRY( 0x5a, TLB_DATA0_2M_4M, 32 ), /* TLB_DATA0 2-MByte or 4 MByte pages, 4-way set associative */
TLB_ENTRY( 0x5b, TLB_DATA_4K_4M, 64 ), /* TLB_DATA 4 KByte and 4 MByte pages */
TLB_ENTRY( 0x5c, TLB_DATA_4K_4M, 128 ), /* TLB_DATA 4 KByte and 4 MByte pages */
TLB_ENTRY( 0x5d, TLB_DATA_4K_4M, 256 ), /* TLB_DATA 4 KByte and 4 MByte pages */
TLB_ENTRY( 0x61, TLB_INST_4K, 48 ), /* TLB_INST 4 KByte pages, full associative */
TLB_ENTRY( 0x63, TLB_DATA_1G_2M_4M, 4 ), /* TLB_DATA 1 GByte pages, 4-way set associative
* (plus 32 entries TLB_DATA 2 MByte or 4 MByte pages, not encoded here) */
TLB_ENTRY( 0x6b, TLB_DATA_4K, 256 ), /* TLB_DATA 4 KByte pages, 8-way associative */
TLB_ENTRY( 0x6c, TLB_DATA_2M_4M, 128 ), /* TLB_DATA 2 MByte or 4 MByte pages, 8-way associative */
TLB_ENTRY( 0x6d, TLB_DATA_1G, 16 ), /* TLB_DATA 1 GByte pages, fully associative */
TLB_ENTRY( 0x76, TLB_INST_2M_4M, 8 ), /* TLB_INST 2-MByte or 4-MByte pages, fully associative */
TLB_ENTRY( 0xb0, TLB_INST_4K, 128 ), /* TLB_INST 4 KByte pages, 4-way set associative */
TLB_ENTRY( 0xb1, TLB_INST_2M_4M, 4 ), /* TLB_INST 2M pages, 4-way, 8 entries or 4M pages, 4-way entries */
TLB_ENTRY( 0xb2, TLB_INST_4K, 64 ), /* TLB_INST 4KByte pages, 4-way set associative */
TLB_ENTRY( 0xb3, TLB_DATA_4K, 128 ), /* TLB_DATA 4 KByte pages, 4-way set associative */
TLB_ENTRY( 0xb4, TLB_DATA_4K, 256 ), /* TLB_DATA 4 KByte pages, 4-way associative */
TLB_ENTRY( 0xb5, TLB_INST_4K, 64 ), /* TLB_INST 4 KByte pages, 8-way set associative */
TLB_ENTRY( 0xb6, TLB_INST_4K, 128 ), /* TLB_INST 4 KByte pages, 8-way set associative */
TLB_ENTRY( 0xba, TLB_DATA_4K, 64 ), /* TLB_DATA 4 KByte pages, 4-way associative */
TLB_ENTRY( 0xc0, TLB_DATA_4K_4M, 8 ), /* TLB_DATA 4 KByte and 4 MByte pages, 4-way associative */
TLB_ENTRY( 0xc1, STLB_4K_2M, 1024 ), /* STLB 4 KByte and 2 MByte pages, 8-way associative */
TLB_ENTRY( 0xc2, TLB_DATA_2M_4M, 16 ), /* TLB_DATA 2 MByte/4MByte pages, 4-way associative */
TLB_ENTRY( 0xca, STLB_4K, 512 ), /* STLB 4 KByte pages, 4-way associative */
};
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