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[3/3] target/riscv: Don't assume PMU counters are continuous

Message ID 20231003125107.34859-4-rbradford@rivosinc.com
State New
Headers show
Series Support discontinuous PMU counters | expand

Commit Message

Rob Bradford Oct. 3, 2023, 12:49 p.m. UTC 
Check the PMU available bitmask when checking if a counter is valid
rather than comparing the index against the number of PMUs.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
---
 target/riscv/csr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Comments

LIU Zhiwei Oct. 12, 2023, 8:25 a.m. UTC | #1 
On 2023/10/3 20:49, Rob Bradford wrote:
> Check the PMU available bitmask when checking if a counter is valid
> rather than comparing the index against the number of PMUs.
>
> Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
> ---
>   target/riscv/csr.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> index 85a31dc420..3e126219ba 100644
> --- a/target/riscv/csr.c
> +++ b/target/riscv/csr.c
> @@ -182,7 +182,8 @@ static RISCVException zcmt(CPURISCVState *env, int csrno)
>   #if !defined(CONFIG_USER_ONLY)
>   static RISCVException mctr(CPURISCVState *env, int csrno)
>   {
> -    int pmu_num = riscv_cpu_cfg(env)->pmu_num;
> +    RISCVCPU *cpu = RISCV_CPU(env_cpu(env));
Use env_archcpu(env) instead of RISCV_CPU(env_cpu(env)) macro.
> +    uint32_t pmu_avail_ctrs = cpu->pmu_avail_ctrs;
>       int ctr_index;
>       int base_csrno = CSR_MHPMCOUNTER3;
>   
> @@ -191,7 +192,7 @@ static RISCVException mctr(CPURISCVState *env, int csrno)
>           base_csrno += 0x80;
>       }
>       ctr_index = csrno - base_csrno;
> -    if (!pmu_num || ctr_index >= pmu_num) {
> +    if ((BIT(ctr_index) & pmu_avail_ctrs >> 3) == 0) {

Otherwise,

Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>

Zhiwei

>           /* The PMU is not enabled or counter is out of range */
>           return RISCV_EXCP_ILLEGAL_INST;
>       }
diff mbox series

Patch

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 85a31dc420..3e126219ba 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -182,7 +182,8 @@  static RISCVException zcmt(CPURISCVState *env, int csrno)
 #if !defined(CONFIG_USER_ONLY)
 static RISCVException mctr(CPURISCVState *env, int csrno)
 {
-    int pmu_num = riscv_cpu_cfg(env)->pmu_num;
+    RISCVCPU *cpu = RISCV_CPU(env_cpu(env));
+    uint32_t pmu_avail_ctrs = cpu->pmu_avail_ctrs;
     int ctr_index;
     int base_csrno = CSR_MHPMCOUNTER3;
 
@@ -191,7 +192,7 @@  static RISCVException mctr(CPURISCVState *env, int csrno)
         base_csrno += 0x80;
     }
     ctr_index = csrno - base_csrno;
-    if (!pmu_num || ctr_index >= pmu_num) {
+    if ((BIT(ctr_index) & pmu_avail_ctrs >> 3) == 0) {
         /* The PMU is not enabled or counter is out of range */
         return RISCV_EXCP_ILLEGAL_INST;
     }