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target/riscv: Use existing PMU counter mask in FDT generation 

During the FDT generation use the existing mask containing the enabled
counters rather then generating a new one. Using the existing mask will
support the use of discontinuous counters.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Message-ID: <20231031154000.18134-4-rbradford@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Rob Bradford 2023-10-31 15:37:15 +00:00 committed by Alistair Francis
parent 7c1bb1d8d4
commit 2571a6427c
3 changed files with 3 additions and 7 deletions
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2
hw/riscv/virt.c
View File

@ -722,7 +722,7 @@ static void create_fdt_pmu(RISCVVirtState *s)
pmu_name = g_strdup_printf("/pmu");
qemu_fdt_add_subnode(ms->fdt, pmu_name);
qemu_fdt_setprop_string(ms->fdt, pmu_name, "compatible", "riscv,pmu");
riscv_pmu_generate_fdt_node(ms->fdt, hart.cfg.pmu_num, pmu_name);
riscv_pmu_generate_fdt_node(ms->fdt, hart.pmu_avail_ctrs, pmu_name);
g_free(pmu_name);
}

6
target/riscv/pmu.c
View File

@ -34,13 +34,9 @@
* to provide the correct value as well. Heterogeneous PMU per hart is not
* supported yet. Thus, number of counters are same across all harts.
*/
void riscv_pmu_generate_fdt_node(void *fdt, int num_ctrs, char *pmu_name)
void riscv_pmu_generate_fdt_node(void *fdt, uint32_t cmask, char *pmu_name)
{
uint32_t fdt_event_ctr_map[15] = {};
uint32_t cmask;
/* All the programmable counters can map to any event */
cmask = MAKE_32BIT_MASK(3, num_ctrs);
/*
* The event encoding is specified in the SBI specification

2
target/riscv/pmu.h
View File

@ -28,6 +28,6 @@ void riscv_pmu_init(RISCVCPU *cpu, Error **errp);
int riscv_pmu_update_event_map(CPURISCVState *env, uint64_t value,
uint32_t ctr_idx);
int riscv_pmu_incr_ctr(RISCVCPU *cpu, enum riscv_pmu_event_idx event_idx);
void riscv_pmu_generate_fdt_node(void *fdt, int num_counters, char *pmu_name);
void riscv_pmu_generate_fdt_node(void *fdt, uint32_t cmask, char *pmu_name);
int riscv_pmu_setup_timer(CPURISCVState *env, uint64_t value,
uint32_t ctr_idx);