linux-kernel - [PATCH v8 02/12] target/riscv: Implement PMU CSR predicate function for S-mode

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Message-Id: <20220511215956.2351243-3-atishp@rivosinc.com>
Date:   Wed, 11 May 2022 14:59:46 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alistair Francis <alistair.francis@....com>,
        Bin Meng <bmeng.cn@...il.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 02/12] target/riscv: Implement PMU CSR predicate function for S-mode

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

Currently, the predicate function for PMU related CSRs only works if
virtualization is enabled. It also does not check mcounteren bits before
before cycle/minstret/hpmcounterx access.

Support supervisor mode access in the predicate function as well.

Reviewed-by: Alistair Francis <alistair.francis@....com>
Reviewed-by: Bin Meng <bmeng.cn@...il.com>
Signed-off-by: Atish Patra <atish.patra@....com>
Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 target/riscv/csr.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index ee3a35afa256..d175fe3f1af3 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -79,6 +79,57 @@ static RISCVException ctr(CPURISCVState *env, int csrno)
         return RISCV_EXCP_ILLEGAL_INST;
     }
 
+    if (env->priv == PRV_S) {
+        switch (csrno) {
+        case CSR_CYCLE:
+            if (!get_field(env->mcounteren, COUNTEREN_CY)) {
+                return RISCV_EXCP_ILLEGAL_INST;
+            }
+            break;
+        case CSR_TIME:
+            if (!get_field(env->mcounteren, COUNTEREN_TM)) {
+                return RISCV_EXCP_ILLEGAL_INST;
+            }
+            break;
+        case CSR_INSTRET:
+            if (!get_field(env->mcounteren, COUNTEREN_IR)) {
+                return RISCV_EXCP_ILLEGAL_INST;
+            }
+            break;
+        case CSR_HPMCOUNTER3...CSR_HPMCOUNTER31:
+            ctr_index = csrno - CSR_CYCLE;
+            if (!get_field(env->mcounteren, 1 << ctr_index)) {
+                return RISCV_EXCP_ILLEGAL_INST;
+            }
+            break;
+        }
+        if (riscv_cpu_mxl(env) == MXL_RV32) {
+            switch (csrno) {
+            case CSR_CYCLEH:
+                if (!get_field(env->mcounteren, COUNTEREN_CY)) {
+                    return RISCV_EXCP_ILLEGAL_INST;
+                }
+                break;
+            case CSR_TIMEH:
+                if (!get_field(env->mcounteren, COUNTEREN_TM)) {
+                    return RISCV_EXCP_ILLEGAL_INST;
+                }
+                break;
+            case CSR_INSTRETH:
+                if (!get_field(env->mcounteren, COUNTEREN_IR)) {
+                    return RISCV_EXCP_ILLEGAL_INST;
+                }
+                break;
+            case CSR_HPMCOUNTER3H...CSR_HPMCOUNTER31H:
+                ctr_index = csrno - CSR_CYCLEH;
+                if (!get_field(env->mcounteren, 1 << ctr_index)) {
+                    return RISCV_EXCP_ILLEGAL_INST;
+                }
+                break;
+            }
+        }
+    }
+
     if (riscv_cpu_virt_enabled(env)) {
         switch (csrno) {
         case CSR_CYCLE:
-- 
2.25.1