diff options
| author | Atish Patra <atish.patra@wdc.com> | 2021-07-10 09:18:13 -0700 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-07-11 10:38:02 +0530 |
| commit | 37f9b0f2f265b2f312d974fb8d100b85b3faf94f (patch) | |
| tree | 914b0a37f87f7fe6a8bee2f248019bfa15012055 /lib/sbi | |
| parent | ae72ec091508196e29c07ae46bca106373d31e39 (diff) | |
lib: sbi: Implement SBI PMU extension
RISC-V SBI specfication 0.3 defines a PMU extension that allows supervisor
mode to start/stop/configure pmu related events. This patch implements
all of the functionality defined in the specification.
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'lib/sbi')
| -rw-r--r-- | lib/sbi/objects.mk | 1 | ||||
| -rw-r--r-- | lib/sbi/sbi_ecall.c | 3 | ||||
| -rw-r--r-- | lib/sbi/sbi_ecall_pmu.c | 93 | ||||
| -rw-r--r-- | lib/sbi/sbi_pmu.c | 2 |
4 files changed, 98 insertions, 1 deletions
diff --git a/lib/sbi/objects.mk b/lib/sbi/objects.mk index d9068b7..7096f24 100644 --- a/lib/sbi/objects.mk +++ b/lib/sbi/objects.mk @@ -20,6 +20,7 @@ libsbi-objs-y += sbi_ecall.o libsbi-objs-y += sbi_ecall_base.o libsbi-objs-y += sbi_ecall_hsm.o libsbi-objs-y += sbi_ecall_legacy.o +libsbi-objs-y += sbi_ecall_pmu.o libsbi-objs-y += sbi_ecall_replace.o libsbi-objs-y += sbi_ecall_vendor.o libsbi-objs-y += sbi_emulate_csr.o diff --git a/lib/sbi/sbi_ecall.c b/lib/sbi/sbi_ecall.c index e92a539..ce021eb 100644 --- a/lib/sbi/sbi_ecall.c +++ b/lib/sbi/sbi_ecall.c @@ -164,6 +164,9 @@ int sbi_ecall_init(void) ret = sbi_ecall_register_extension(&ecall_srst); if (ret) return ret; + ret = sbi_ecall_register_extension(&ecall_pmu); + if (ret) + return ret; ret = sbi_ecall_register_extension(&ecall_legacy); if (ret) return ret; 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, +}; diff --git a/lib/sbi/sbi_pmu.c b/lib/sbi/sbi_pmu.c index d01e248..4092e6f 100644 --- a/lib/sbi/sbi_pmu.c +++ b/lib/sbi/sbi_pmu.c @@ -375,7 +375,7 @@ static int pmu_update_hw_mhpmevent(struct sbi_pmu_hw_event *hw_evt, int ctr_idx, if (!mhpmevent_val || ctr_idx < 3 || ctr_idx >= SBI_PMU_HW_CTR_MAX) return SBI_EFAIL; - /* TODO: The upper 8 bits of mhpmevent is reserved by sscofpmf extension. + /* TODO: The upper 16 bits of mhpmevent is reserved by sscofpmf extension. * Update those bits based on the flags received from supervisor. * The OVF bit also should be cleared here in case it was not cleared * during event stop. |