diff mbox series

[v5,09/12] target/riscv: Simplify counter predicate function

Message ID 20220219002518.1936806-10-atishp@rivosinc.com (mailing list archive)
State New, archived
Headers show
Series Improve PMU support | expand

Commit Message

Atish Kumar Patra Feb. 19, 2022, 12:25 a.m. UTC 
All the hpmcounters and the fixed counters (CY, IR, TM) can be represented
as a unified counter. Thus, the predicate function doesn't need handle each
case separately.

Simplify the predicate function so that we just handle things differently
between RV32/RV64 and S/HS mode.

Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
---
 target/riscv/csr.c | 111 ++++-----------------------------------------
 1 file changed, 10 insertions(+), 101 deletions(-)

Comments

Alistair Francis March 2, 2022, 10:45 p.m. UTC | #1 
On Sat, Feb 19, 2022 at 10:37 AM Atish Patra <atishp@rivosinc.com> wrote:
>
> All the hpmcounters and the fixed counters (CY, IR, TM) can be represented
> as a unified counter. Thus, the predicate function doesn't need handle each
> case separately.
>
> Simplify the predicate function so that we just handle things differently
> between RV32/RV64 and S/HS mode.
>
> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
> Signed-off-by: Atish Patra <atishp@rivosinc.com>

Acked-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  target/riscv/csr.c | 111 ++++-----------------------------------------
>  1 file changed, 10 insertions(+), 101 deletions(-)
>
> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> index 0071b13bc50f..54966a770672 100644
> --- a/target/riscv/csr.c
> +++ b/target/riscv/csr.c
> @@ -113,6 +113,7 @@ static RISCVException ctr(CPURISCVState *env, int csrno)
>      CPUState *cs = env_cpu(env);
>      RISCVCPU *cpu = RISCV_CPU(cs);
>      int ctr_index;
> +    target_ulong ctr_mask;
>      int base_csrno = CSR_CYCLE;
>      bool rv32 = riscv_cpu_mxl(env) == MXL_RV32 ? true : false;
>
> @@ -121,122 +122,30 @@ static RISCVException ctr(CPURISCVState *env, int csrno)
>          base_csrno += 0x80;
>      }
>      ctr_index = csrno - base_csrno;
> +    ctr_mask = BIT(ctr_index);
>
>      if ((csrno >= CSR_CYCLE && csrno <= CSR_INSTRET) ||
>          (csrno >= CSR_CYCLEH && csrno <= CSR_INSTRETH)) {
>          goto skip_ext_pmu_check;
>      }
>
> -    if ((!cpu->cfg.pmu_num || !(cpu->pmu_avail_ctrs & BIT(ctr_index)))) {
> +    if ((!cpu->cfg.pmu_num || !(cpu->pmu_avail_ctrs & ctr_mask))) {
>          /* No counter is enabled in PMU or the counter is out of range */
>          return RISCV_EXCP_ILLEGAL_INST;
>      }
>
>  skip_ext_pmu_check:
>
> -    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:
> -            if (!get_field(env->mcounteren, 1 << ctr_index)) {
> -                return RISCV_EXCP_ILLEGAL_INST;
> -            }
> -            break;
> -        }
> -        if (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:
> -                if (!get_field(env->mcounteren, 1 << ctr_index)) {
> -                    return RISCV_EXCP_ILLEGAL_INST;
> -                }
> -                break;
> -            }
> -        }
> +    if ((env->priv == PRV_S) && (!get_field(env->mcounteren, ctr_mask))) {
> +        return RISCV_EXCP_ILLEGAL_INST;
>      }
>
>      if (riscv_cpu_virt_enabled(env)) {
> -        switch (csrno) {
> -        case CSR_CYCLE:
> -            if (!get_field(env->hcounteren, COUNTEREN_CY) &&
> -                get_field(env->mcounteren, COUNTEREN_CY)) {
> -                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -            }
> -            break;
> -        case CSR_TIME:
> -            if (!get_field(env->hcounteren, COUNTEREN_TM) &&
> -                get_field(env->mcounteren, COUNTEREN_TM)) {
> -                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -            }
> -            break;
> -        case CSR_INSTRET:
> -            if (!get_field(env->hcounteren, COUNTEREN_IR) &&
> -                get_field(env->mcounteren, COUNTEREN_IR)) {
> -                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -            }
> -            break;
> -        case CSR_HPMCOUNTER3...CSR_HPMCOUNTER31:
> -            if (!get_field(env->hcounteren, 1 << ctr_index) &&
> -                 get_field(env->mcounteren, 1 << ctr_index)) {
> -                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -            }
> -            break;
> -        }
> -        if (rv32) {
> -            switch (csrno) {
> -            case CSR_CYCLEH:
> -                if (!get_field(env->hcounteren, COUNTEREN_CY) &&
> -                    get_field(env->mcounteren, COUNTEREN_CY)) {
> -                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -                }
> -                break;
> -            case CSR_TIMEH:
> -                if (!get_field(env->hcounteren, COUNTEREN_TM) &&
> -                    get_field(env->mcounteren, COUNTEREN_TM)) {
> -                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -                }
> -                break;
> -            case CSR_INSTRETH:
> -                if (!get_field(env->hcounteren, COUNTEREN_IR) &&
> -                    get_field(env->mcounteren, COUNTEREN_IR)) {
> -                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -                }
> -                break;
> -            case CSR_HPMCOUNTER3H...CSR_HPMCOUNTER31H:
> -                if (!get_field(env->hcounteren, 1 << ctr_index) &&
> -                     get_field(env->mcounteren, 1 << ctr_index)) {
> -                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> -                }
> -                break;
> -            }
> +        if (!get_field(env->mcounteren, ctr_mask)) {
> +            /* The bit must be set in mcountern for HS mode access */
> +            return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
> +        } else if (!get_field(env->hcounteren, ctr_mask)) {
> +            return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
>          }
>      }
>  #endif
> --
> 2.30.2
>
>
diff mbox series

Patch

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 0071b13bc50f..54966a770672 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -113,6 +113,7 @@  static RISCVException ctr(CPURISCVState *env, int csrno)
     CPUState *cs = env_cpu(env);
     RISCVCPU *cpu = RISCV_CPU(cs);
     int ctr_index;
+    target_ulong ctr_mask;
     int base_csrno = CSR_CYCLE;
     bool rv32 = riscv_cpu_mxl(env) == MXL_RV32 ? true : false;
 
@@ -121,122 +122,30 @@  static RISCVException ctr(CPURISCVState *env, int csrno)
         base_csrno += 0x80;
     }
     ctr_index = csrno - base_csrno;
+    ctr_mask = BIT(ctr_index);
 
     if ((csrno >= CSR_CYCLE && csrno <= CSR_INSTRET) ||
         (csrno >= CSR_CYCLEH && csrno <= CSR_INSTRETH)) {
         goto skip_ext_pmu_check;
     }
 
-    if ((!cpu->cfg.pmu_num || !(cpu->pmu_avail_ctrs & BIT(ctr_index)))) {
+    if ((!cpu->cfg.pmu_num || !(cpu->pmu_avail_ctrs & ctr_mask))) {
         /* No counter is enabled in PMU or the counter is out of range */
         return RISCV_EXCP_ILLEGAL_INST;
     }
 
 skip_ext_pmu_check:
 
-    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:
-            if (!get_field(env->mcounteren, 1 << ctr_index)) {
-                return RISCV_EXCP_ILLEGAL_INST;
-            }
-            break;
-        }
-        if (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:
-                if (!get_field(env->mcounteren, 1 << ctr_index)) {
-                    return RISCV_EXCP_ILLEGAL_INST;
-                }
-                break;
-            }
-        }
+    if ((env->priv == PRV_S) && (!get_field(env->mcounteren, ctr_mask))) {
+        return RISCV_EXCP_ILLEGAL_INST;
     }
 
     if (riscv_cpu_virt_enabled(env)) {
-        switch (csrno) {
-        case CSR_CYCLE:
-            if (!get_field(env->hcounteren, COUNTEREN_CY) &&
-                get_field(env->mcounteren, COUNTEREN_CY)) {
-                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-            }
-            break;
-        case CSR_TIME:
-            if (!get_field(env->hcounteren, COUNTEREN_TM) &&
-                get_field(env->mcounteren, COUNTEREN_TM)) {
-                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-            }
-            break;
-        case CSR_INSTRET:
-            if (!get_field(env->hcounteren, COUNTEREN_IR) &&
-                get_field(env->mcounteren, COUNTEREN_IR)) {
-                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-            }
-            break;
-        case CSR_HPMCOUNTER3...CSR_HPMCOUNTER31:
-            if (!get_field(env->hcounteren, 1 << ctr_index) &&
-                 get_field(env->mcounteren, 1 << ctr_index)) {
-                return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-            }
-            break;
-        }
-        if (rv32) {
-            switch (csrno) {
-            case CSR_CYCLEH:
-                if (!get_field(env->hcounteren, COUNTEREN_CY) &&
-                    get_field(env->mcounteren, COUNTEREN_CY)) {
-                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-                }
-                break;
-            case CSR_TIMEH:
-                if (!get_field(env->hcounteren, COUNTEREN_TM) &&
-                    get_field(env->mcounteren, COUNTEREN_TM)) {
-                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-                }
-                break;
-            case CSR_INSTRETH:
-                if (!get_field(env->hcounteren, COUNTEREN_IR) &&
-                    get_field(env->mcounteren, COUNTEREN_IR)) {
-                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-                }
-                break;
-            case CSR_HPMCOUNTER3H...CSR_HPMCOUNTER31H:
-                if (!get_field(env->hcounteren, 1 << ctr_index) &&
-                     get_field(env->mcounteren, 1 << ctr_index)) {
-                    return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
-                }
-                break;
-            }
+        if (!get_field(env->mcounteren, ctr_mask)) {
+            /* The bit must be set in mcountern for HS mode access */
+            return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
+        } else if (!get_field(env->hcounteren, ctr_mask)) {
+            return RISCV_EXCP_VIRT_INSTRUCTION_FAULT;
         }
     }
 #endif