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c9449c8506
The auto counter reload feature requires an event flag to indicate an auto counter reload group, which can only be scheduled on specific counters that enumerated in CPUID. However, the hw_perf_event.flags has run out on X86. Two solutions were considered to address the issue. - Currently, 20 bits are reserved for the architecture-specific flags. Only the bit 31 is used for the generic flag. There is still plenty of space left. Reserve 8 more bits for the arch-specific flags. - Add a new X86 specific hw_perf_event.flags1 to support more flags. The former is implemented. Enough room is still left in the global generic flag. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Thomas Falcon <thomas.falcon@intel.com> Link: https://lkml.kernel.org/r/20250327195217.2683619-4-kan.liang@linux.intel.com
25 lines
1.4 KiB
C
25 lines
1.4 KiB
C
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/*
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* struct hw_perf_event.flags flags
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*/
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PERF_ARCH(PEBS_LDLAT, 0x0000001) /* ld+ldlat data address sampling */
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PERF_ARCH(PEBS_ST, 0x0000002) /* st data address sampling */
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PERF_ARCH(PEBS_ST_HSW, 0x0000004) /* haswell style datala, store */
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PERF_ARCH(PEBS_LD_HSW, 0x0000008) /* haswell style datala, load */
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PERF_ARCH(PEBS_NA_HSW, 0x0000010) /* haswell style datala, unknown */
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PERF_ARCH(EXCL, 0x0000020) /* HT exclusivity on counter */
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PERF_ARCH(DYNAMIC, 0x0000040) /* dynamic alloc'd constraint */
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PERF_ARCH(PEBS_CNTR, 0x0000080) /* PEBS counters snapshot */
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PERF_ARCH(EXCL_ACCT, 0x0000100) /* accounted EXCL event */
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PERF_ARCH(AUTO_RELOAD, 0x0000200) /* use PEBS auto-reload */
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PERF_ARCH(LARGE_PEBS, 0x0000400) /* use large PEBS */
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PERF_ARCH(PEBS_VIA_PT, 0x0000800) /* use PT buffer for PEBS */
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PERF_ARCH(PAIR, 0x0001000) /* Large Increment per Cycle */
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PERF_ARCH(LBR_SELECT, 0x0002000) /* Save/Restore MSR_LBR_SELECT */
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PERF_ARCH(TOPDOWN, 0x0004000) /* Count Topdown slots/metrics events */
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PERF_ARCH(PEBS_STLAT, 0x0008000) /* st+stlat data address sampling */
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PERF_ARCH(AMD_BRS, 0x0010000) /* AMD Branch Sampling */
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PERF_ARCH(PEBS_LAT_HYBRID, 0x0020000) /* ld and st lat for hybrid */
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PERF_ARCH(NEEDS_BRANCH_STACK, 0x0040000) /* require branch stack setup */
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PERF_ARCH(BRANCH_COUNTERS, 0x0080000) /* logs the counters in the extra space of each branch */
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PERF_ARCH(ACR, 0x0100000) /* Auto counter reload */
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