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docs: pmu: extend bindings example for Unmatched

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Extend example for Unmatched board to provide SBI PMU bindings
for generalized and cache event's where they are applicable.

Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Nikita Shubin
2022-09-02 10:41:04 +03:00
committed by Anup Patel
parent d32b0a92db
commit 19664f6757
1 changed files with 30 additions and 0 deletions
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docs/pmu_support.md
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@@ -90,9 +90,39 @@ pmu {
/*
* For HiFive Unmatched board. The encodings can be found here
* https://sifive.cdn.prismic.io/sifive/1a82e600-1f93-4f41-b2d8-86ed8b16acba_fu740-c000-manual-v1p6.pdf
* This example also binds standard SBI PMU hardware id's to U74 PMU event codes, U74 uses bitfield for
* events encoding, so several U74 events can be bound to single perf id.
* See SBI PMU hardware id's in include/sbi/sbi_ecall_interface.h
*/
pmu {
compatible = "riscv,pmu";
riscv,event-to-mhpmevent =
/* SBI_PMU_HW_CACHE_REFERENCES -> Instruction cache/ITIM busy | Data cache/DTIM busy */
<0x00003 0x00000000 0x1801>,
/* SBI_PMU_HW_CACHE_MISSES -> Instruction cache miss | Data cache miss or memory-mapped I/O access */
<0x00004 0x00000000 0x0302>,
/* SBI_PMU_HW_BRANCH_INSTRUCTIONS -> Conditional branch retired */
<0x00005 0x00000000 0x4000>,
/* SBI_PMU_HW_BRANCH_MISSES -> Branch direction misprediction | Branch/jump target misprediction */
<0x00006 0x00000000 0x6001>,
/* L1D_READ_MISS -> Data cache miss or memory-mapped I/O access */
<0x10001 0x00000000 0x0202>,
/* L1D_WRITE_ACCESS -> Data cache write-back */
<0x10002 0x00000000 0x0402>,
/* L1I_READ_ACCESS -> Instruction cache miss */
<0x10009 0x00000000 0x0102>,
/* LL_READ_MISS -> UTLB miss */
<0x10011 0x00000000 0x2002>,
/* DTLB_READ_MISS -> Data TLB miss */
<0x10019 0x00000000 0x1002>,
/* ITLB_READ_MISS-> Instruction TLB miss */
<0x10021 0x00000000 0x0802>;
riscv,event-to-mhpmcounters = <0x00003 0x00006 0x18>,
<0x10001 0x10002 0x18>,
<0x10009 0x10009 0x18>,
<0x10011 0x10011 0x18>,
<0x10019 0x10019 0x18>,
<0x10021 0x10021 0x18>;
riscv,raw-event-to-mhpmcounters = <0x0 0x0 0xffffffff 0xfc0000ff 0x18>,
<0x0 0x1 0xffffffff 0xfff800ff 0x18>,
<0x0 0x2 0xffffffff 0xffffe0ff 0x18>;