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author | Anju T Sudhakar <anju@linux.vnet.ibm.com> | 2019-04-16 15:18:31 +0530 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 02:55:00 +1000 |
commit | 012ae244845f19d5f6ca2a90426851bc5044a0dc (patch) | |
tree | 514e95abb481fbb75141728114dafdd5a06a5f9d | |
parent | 72c69dcddce103338de558c5c6e9ef9e4f607ce1 (diff) | |
download | linux-stable-012ae244845f19d5f6ca2a90426851bc5044a0dc.tar.gz linux-stable-012ae244845f19d5f6ca2a90426851bc5044a0dc.tar.bz2 linux-stable-012ae244845f19d5f6ca2a90426851bc5044a0dc.zip |
powerpc/perf: Trace imc PMU functions
Add PMU functions to support trace-imc.
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
-rw-r--r-- | arch/powerpc/perf/imc-pmu.c | 205 |
1 files changed, 204 insertions, 1 deletions
diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c index 3cc5e1934f0c..31fa753e2eb2 100644 --- a/arch/powerpc/perf/imc-pmu.c +++ b/arch/powerpc/perf/imc-pmu.c @@ -53,7 +53,7 @@ static struct imc_pmu *imc_event_to_pmu(struct perf_event *event) return container_of(event->pmu, struct imc_pmu, pmu); } -PMU_FORMAT_ATTR(event, "config:0-40"); +PMU_FORMAT_ATTR(event, "config:0-61"); PMU_FORMAT_ATTR(offset, "config:0-31"); PMU_FORMAT_ATTR(rvalue, "config:32"); PMU_FORMAT_ATTR(mode, "config:33-40"); @@ -70,6 +70,25 @@ static struct attribute_group imc_format_group = { .attrs = imc_format_attrs, }; +/* Format attribute for imc trace-mode */ +PMU_FORMAT_ATTR(cpmc_reserved, "config:0-19"); +PMU_FORMAT_ATTR(cpmc_event, "config:20-27"); +PMU_FORMAT_ATTR(cpmc_samplesel, "config:28-29"); +PMU_FORMAT_ATTR(cpmc_load, "config:30-61"); +static struct attribute *trace_imc_format_attrs[] = { + &format_attr_event.attr, + &format_attr_cpmc_reserved.attr, + &format_attr_cpmc_event.attr, + &format_attr_cpmc_samplesel.attr, + &format_attr_cpmc_load.attr, + NULL, +}; + +static struct attribute_group trace_imc_format_group = { +.name = "format", +.attrs = trace_imc_format_attrs, +}; + /* Get the cpumask printed to a buffer "buf" */ static ssize_t imc_pmu_cpumask_get_attr(struct device *dev, struct device_attribute *attr, @@ -1113,6 +1132,182 @@ static int trace_imc_cpu_init(void) ppc_trace_imc_cpu_offline); } +static u64 get_trace_imc_event_base_addr(void) +{ + return (u64)per_cpu(trace_imc_mem, smp_processor_id()); +} + +/* + * Function to parse trace-imc data obtained + * and to prepare the perf sample. + */ +static int trace_imc_prepare_sample(struct trace_imc_data *mem, + struct perf_sample_data *data, + u64 *prev_tb, + struct perf_event_header *header, + struct perf_event *event) +{ + /* Sanity checks for a valid record */ + if (be64_to_cpu(READ_ONCE(mem->tb1)) > *prev_tb) + *prev_tb = be64_to_cpu(READ_ONCE(mem->tb1)); + else + return -EINVAL; + + if ((be64_to_cpu(READ_ONCE(mem->tb1)) & IMC_TRACE_RECORD_TB1_MASK) != + be64_to_cpu(READ_ONCE(mem->tb2))) + return -EINVAL; + + /* Prepare perf sample */ + data->ip = be64_to_cpu(READ_ONCE(mem->ip)); + data->period = event->hw.last_period; + + header->type = PERF_RECORD_SAMPLE; + header->size = sizeof(*header) + event->header_size; + header->misc = 0; + + if (is_kernel_addr(data->ip)) + header->misc |= PERF_RECORD_MISC_KERNEL; + else + header->misc |= PERF_RECORD_MISC_USER; + + perf_event_header__init_id(header, data, event); + + return 0; +} + +static void dump_trace_imc_data(struct perf_event *event) +{ + struct trace_imc_data *mem; + int i, ret; + u64 prev_tb = 0; + + mem = (struct trace_imc_data *)get_trace_imc_event_base_addr(); + for (i = 0; i < (trace_imc_mem_size / sizeof(struct trace_imc_data)); + i++, mem++) { + struct perf_sample_data data; + struct perf_event_header header; + + ret = trace_imc_prepare_sample(mem, &data, &prev_tb, &header, event); + if (ret) /* Exit, if not a valid record */ + break; + else { + /* If this is a valid record, create the sample */ + struct perf_output_handle handle; + + if (perf_output_begin(&handle, event, header.size)) + return; + + perf_output_sample(&handle, &header, &data, event); + perf_output_end(&handle); + } + } +} + +static int trace_imc_event_add(struct perf_event *event, int flags) +{ + int core_id = smp_processor_id() / threads_per_core; + struct imc_pmu_ref *ref = NULL; + u64 local_mem, ldbar_value; + + /* Set trace-imc bit in ldbar and load ldbar with per-thread memory address */ + local_mem = get_trace_imc_event_base_addr(); + ldbar_value = ((u64)local_mem & THREAD_IMC_LDBAR_MASK) | TRACE_IMC_ENABLE; + + if (core_imc_refc) + ref = &core_imc_refc[core_id]; + if (!ref) { + /* If core-imc is not enabled, use trace-imc reference count */ + if (trace_imc_refc) + ref = &trace_imc_refc[core_id]; + if (!ref) + return -EINVAL; + } + mtspr(SPRN_LDBAR, ldbar_value); + mutex_lock(&ref->lock); + if (ref->refc == 0) { + if (opal_imc_counters_start(OPAL_IMC_COUNTERS_TRACE, + get_hard_smp_processor_id(smp_processor_id()))) { + mutex_unlock(&ref->lock); + pr_err("trace-imc: Unable to start the counters for core %d\n", core_id); + mtspr(SPRN_LDBAR, 0); + return -EINVAL; + } + } + ++ref->refc; + mutex_unlock(&ref->lock); + + return 0; +} + +static void trace_imc_event_read(struct perf_event *event) +{ + return; +} + +static void trace_imc_event_stop(struct perf_event *event, int flags) +{ + u64 local_mem = get_trace_imc_event_base_addr(); + dump_trace_imc_data(event); + memset((void *)local_mem, 0, sizeof(u64)); +} + +static void trace_imc_event_start(struct perf_event *event, int flags) +{ + return; +} + +static void trace_imc_event_del(struct perf_event *event, int flags) +{ + int core_id = smp_processor_id() / threads_per_core; + struct imc_pmu_ref *ref = NULL; + + if (core_imc_refc) + ref = &core_imc_refc[core_id]; + if (!ref) { + /* If core-imc is not enabled, use trace-imc reference count */ + if (trace_imc_refc) + ref = &trace_imc_refc[core_id]; + if (!ref) + return; + } + mtspr(SPRN_LDBAR, 0); + mutex_lock(&ref->lock); + ref->refc--; + if (ref->refc == 0) { + if (opal_imc_counters_stop(OPAL_IMC_COUNTERS_TRACE, + get_hard_smp_processor_id(smp_processor_id()))) { + mutex_unlock(&ref->lock); + pr_err("trace-imc: Unable to stop the counters for core %d\n", core_id); + return; + } + } else if (ref->refc < 0) { + ref->refc = 0; + } + mutex_unlock(&ref->lock); + trace_imc_event_stop(event, flags); +} + +static int trace_imc_event_init(struct perf_event *event) +{ + struct task_struct *target; + + if (event->attr.type != event->pmu->type) + return -ENOENT; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + /* Return if this is a couting event */ + if (event->attr.sample_period == 0) + return -ENOENT; + + event->hw.idx = -1; + target = event->hw.target; + + event->pmu->task_ctx_nr = perf_hw_context; + return 0; +} + /* update_pmu_ops : Populate the appropriate operations for "pmu" */ static int update_pmu_ops(struct imc_pmu *pmu) { @@ -1143,6 +1338,14 @@ static int update_pmu_ops(struct imc_pmu *pmu) pmu->pmu.cancel_txn = thread_imc_pmu_cancel_txn; pmu->pmu.commit_txn = thread_imc_pmu_commit_txn; break; + case IMC_DOMAIN_TRACE: + pmu->pmu.event_init = trace_imc_event_init; + pmu->pmu.add = trace_imc_event_add; + pmu->pmu.del = trace_imc_event_del; + pmu->pmu.start = trace_imc_event_start; + pmu->pmu.stop = trace_imc_event_stop; + pmu->pmu.read = trace_imc_event_read; + pmu->attr_groups[IMC_FORMAT_ATTR] = &trace_imc_format_group; default: break; } |