LCOV - code coverage report
Current view: top level - arch/x86/kernel/cpu - scattered.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 12 13 92.3 %
Date: 2022-04-01 14:17:54 Functions: 1 1 100.0 %
Branches: 6 8 75.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  *      Routines to identify additional cpu features that are scattered in
       3                 :            :  *      cpuid space.
       4                 :            :  */
       5                 :            : #include <linux/cpu.h>
       6                 :            : 
       7                 :            : #include <asm/memtype.h>
       8                 :            : #include <asm/apic.h>
       9                 :            : #include <asm/processor.h>
      10                 :            : 
      11                 :            : #include "cpu.h"
      12                 :            : 
      13                 :            : struct cpuid_bit {
      14                 :            :         u16 feature;
      15                 :            :         u8 reg;
      16                 :            :         u8 bit;
      17                 :            :         u32 level;
      18                 :            :         u32 sub_leaf;
      19                 :            : };
      20                 :            : 
      21                 :            : /*
      22                 :            :  * Please keep the leaf sorted by cpuid_bit.level for faster search.
      23                 :            :  * X86_FEATURE_MBA is supported by both Intel and AMD. But the CPUID
      24                 :            :  * levels are different and there is a separate entry for each.
      25                 :            :  */
      26                 :            : static const struct cpuid_bit cpuid_bits[] = {
      27                 :            :         { X86_FEATURE_APERFMPERF,       CPUID_ECX,  0, 0x00000006, 0 },
      28                 :            :         { X86_FEATURE_EPB,              CPUID_ECX,  3, 0x00000006, 0 },
      29                 :            :         { X86_FEATURE_CQM_LLC,          CPUID_EDX,  1, 0x0000000f, 0 },
      30                 :            :         { X86_FEATURE_CQM_OCCUP_LLC,    CPUID_EDX,  0, 0x0000000f, 1 },
      31                 :            :         { X86_FEATURE_CQM_MBM_TOTAL,    CPUID_EDX,  1, 0x0000000f, 1 },
      32                 :            :         { X86_FEATURE_CQM_MBM_LOCAL,    CPUID_EDX,  2, 0x0000000f, 1 },
      33                 :            :         { X86_FEATURE_CAT_L3,           CPUID_EBX,  1, 0x00000010, 0 },
      34                 :            :         { X86_FEATURE_CAT_L2,           CPUID_EBX,  2, 0x00000010, 0 },
      35                 :            :         { X86_FEATURE_CDP_L3,           CPUID_ECX,  2, 0x00000010, 1 },
      36                 :            :         { X86_FEATURE_CDP_L2,           CPUID_ECX,  2, 0x00000010, 2 },
      37                 :            :         { X86_FEATURE_MBA,              CPUID_EBX,  3, 0x00000010, 0 },
      38                 :            :         { X86_FEATURE_HW_PSTATE,        CPUID_EDX,  7, 0x80000007, 0 },
      39                 :            :         { X86_FEATURE_CPB,              CPUID_EDX,  9, 0x80000007, 0 },
      40                 :            :         { X86_FEATURE_PROC_FEEDBACK,    CPUID_EDX, 11, 0x80000007, 0 },
      41                 :            :         { X86_FEATURE_MBA,              CPUID_EBX,  6, 0x80000008, 0 },
      42                 :            :         { X86_FEATURE_SME,              CPUID_EAX,  0, 0x8000001f, 0 },
      43                 :            :         { X86_FEATURE_SEV,              CPUID_EAX,  1, 0x8000001f, 0 },
      44                 :            :         { 0, 0, 0, 0, 0 }
      45                 :            : };
      46                 :            : 
      47                 :         22 : void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
      48                 :            : {
      49                 :         22 :         u32 max_level;
      50                 :         22 :         u32 regs[4];
      51                 :         22 :         const struct cpuid_bit *cb;
      52                 :            : 
      53         [ +  + ]:        396 :         for (cb = cpuid_bits; cb->feature; cb++) {
      54                 :            : 
      55                 :            :                 /* Verify that the level is valid */
      56                 :        374 :                 max_level = cpuid_eax(cb->level & 0xffff0000);
      57         [ +  + ]:        374 :                 if (max_level < cb->level ||
      58         [ -  + ]:        132 :                     max_level > (cb->level | 0xffff))
      59                 :        242 :                         continue;
      60                 :            : 
      61                 :        132 :                 cpuid_count(cb->level, cb->sub_leaf, &regs[CPUID_EAX],
      62                 :            :                             &regs[CPUID_EBX], &regs[CPUID_ECX],
      63                 :            :                             &regs[CPUID_EDX]);
      64                 :            : 
      65         [ -  + ]:        132 :                 if (regs[cb->reg] & (1 << cb->bit))
      66                 :          0 :                         set_cpu_cap(c, cb->feature);
      67                 :            :         }
      68                 :         22 : }

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