linux-kernel - [PATCH v8 10/12] target/riscv: Add few cache related PMU events

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Message-Id: <20220511215956.2351243-11-atishp@rivosinc.com>
Date:   Wed, 11 May 2022 14:59:54 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alistair Francis <alistair.francis@....com>,
        Atish Patra <atishp@...osinc.com>,
        Bin Meng <bin.meng@...driver.com>,
        Palmer Dabbelt <palmer@...belt.com>, qemu-devel@...gnu.org,
        qemu-riscv@...gnu.org
Subject: [PATCH v8 10/12] target/riscv: Add few cache related PMU events

From: Atish Patra <atish.patra@....com>

Qemu can monitor the following cache related PMU events through
tlb_fill functions.

1. DTLB load/store miss
3. ITLB prefetch miss

Increment the PMU counter in tlb_fill function.

Reviewed-by: Alistair Francis <alistair.francis@....com>
Signed-off-by: Atish Patra <atish.patra@....com>
Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 target/riscv/cpu_helper.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index e1aa4f2097c1..004cef0febad 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -21,10 +21,12 @@
 #include "qemu/log.h"
 #include "qemu/main-loop.h"
 #include "cpu.h"
+#include "pmu.h"
 #include "exec/exec-all.h"
 #include "tcg/tcg-op.h"
 #include "trace.h"
 #include "semihosting/common-semi.h"
+#include "cpu_bits.h"
 
 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch)
 {
@@ -1178,6 +1180,28 @@ void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
     cpu_loop_exit_restore(cs, retaddr);
 }
 
+
+static void pmu_tlb_fill_incr_ctr(RISCVCPU *cpu, MMUAccessType access_type)
+{
+    enum riscv_pmu_event_idx pmu_event_type;
+
+    switch (access_type) {
+    case MMU_INST_FETCH:
+        pmu_event_type = RISCV_PMU_EVENT_CACHE_ITLB_PREFETCH_MISS;
+        break;
+    case MMU_DATA_LOAD:
+        pmu_event_type = RISCV_PMU_EVENT_CACHE_DTLB_READ_MISS;
+        break;
+    case MMU_DATA_STORE:
+        pmu_event_type = RISCV_PMU_EVENT_CACHE_DTLB_WRITE_MISS;
+        break;
+    default:
+        return;
+    }
+
+    riscv_pmu_incr_ctr(cpu, pmu_event_type);
+}
+
 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
                         MMUAccessType access_type, int mmu_idx,
                         bool probe, uintptr_t retaddr)
@@ -1274,6 +1298,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
             }
         }
     } else {
+        pmu_tlb_fill_incr_ctr(cpu, access_type);
         /* Single stage lookup */
         ret = get_physical_address(env, &pa, &prot, address, NULL,
                                    access_type, mmu_idx, true, false, false);
-- 
2.25.1