docs: pmu: extend bindings example for Unmatched

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>

diff --git a/docs/pmu_support.md b/docs/pmu_support.md
index ca6ca25..d79b515 100644 (file)
--- a/docs/pmu_support.md
+++ b/docs/pmu_support.md
@@ -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>;