diff options
Diffstat (limited to 'lib/sbi/sbi_ecall_pmu.c')
-rw-r--r-- | lib/sbi/sbi_ecall_pmu.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/lib/sbi/sbi_ecall_pmu.c b/lib/sbi/sbi_ecall_pmu.c new file mode 100644 index 0000000..39d3857 --- /dev/null +++ b/lib/sbi/sbi_ecall_pmu.c @@ -0,0 +1,93 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2021 Western Digital Corporation or its affiliates. + * + * Authors: + * Atish Patra <atish.patra@wdc.com> + */ + +#include <sbi/sbi_ecall.h> +#include <sbi/sbi_ecall_interface.h> +#include <sbi/sbi_error.h> +#include <sbi/sbi_hart.h> +#include <sbi/sbi_trap.h> +#include <sbi/sbi_version.h> +#include <sbi/sbi_pmu.h> +#include <sbi/sbi_scratch.h> +#include <sbi/riscv_asm.h> + +static int sbi_ecall_pmu_handler(unsigned long extid, unsigned long funcid, + const struct sbi_trap_regs *regs, + unsigned long *out_val, + struct sbi_trap_info *out_trap) +{ + int ret = 0; + uint64_t temp; + + switch (funcid) { + case SBI_EXT_PMU_NUM_COUNTERS: + ret = sbi_pmu_num_ctr(); + if (ret >= 0) { + *out_val = ret; + ret = 0; + } + break; + case SBI_EXT_PMU_COUNTER_GET_INFO: + ret = sbi_pmu_ctr_get_info(regs->a0, out_val); + break; + case SBI_EXT_PMU_COUNTER_CFG_MATCH: +#if __riscv_xlen == 32 + temp = ((uint64_t)regs->a5 << 32) | regs->a4; +#else + temp = regs->a4; +#endif + ret = sbi_pmu_ctr_cfg_match(regs->a0, regs->a1, regs->a2, + regs->a3, temp); + if (ret >= 0) { + *out_val = ret; + ret = 0; + } + + break; + case SBI_EXT_PMU_COUNTER_FW_READ: + ret = sbi_pmu_ctr_read(regs->a0, out_val); + break; + case SBI_EXT_PMU_COUNTER_START: + +#if __riscv_xlen == 32 + temp = ((uint64_t)regs->a4 << 32) | regs->a3; +#else + temp = regs->a3; +#endif + ret = sbi_pmu_ctr_start(regs->a0, regs->a1, regs->a2, temp); + break; + case SBI_EXT_PMU_COUNTER_STOP: + ret = sbi_pmu_ctr_stop(regs->a0, regs->a1, regs->a2); + break; + default: + ret = SBI_ENOTSUPP; + }; + + return ret; +} + +static int sbi_ecall_pmu_probe(unsigned long extid, unsigned long *out_val) +{ + struct sbi_scratch *scratch = sbi_scratch_thishart_ptr(); + + /* SBI PMU extension is useless without mcount inhibit features */ + if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT)) + *out_val = 1; + else + *out_val = 0; + + return 0; +} + +struct sbi_ecall_extension ecall_pmu = { + .extid_start = SBI_EXT_PMU, + .extid_end = SBI_EXT_PMU, + .handle = sbi_ecall_pmu_handler, + .probe = sbi_ecall_pmu_probe, +}; |