diff options
author | Jonathan Kim <jonathan.kim@amd.com> | 2019-06-20 05:56:25 +0200 |
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committer | Alex Deucher <alexander.deucher@amd.com> | 2019-06-20 18:36:22 +0200 |
commit | 9c7c85f7ea1fe55e9406858e3ca32a51494bd02e (patch) | |
tree | d097140f5873497999fbaad971ac35beb02e13a0 /drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | |
parent | drm/amdgpu: update df_v3_6 for xgmi perfmons (v2) (diff) | |
download | linux-9c7c85f7ea1fe55e9406858e3ca32a51494bd02e.tar.xz linux-9c7c85f7ea1fe55e9406858e3ca32a51494bd02e.zip |
drm/amdgpu: add pmu counters
adding perf event counters
Signed-off-by: Jonathan Kim <Jonathan.Kim@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c')
-rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c new file mode 100644 index 000000000000..0e6dba9f60f0 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pmu.c @@ -0,0 +1,280 @@ +/* + * Copyright 2019 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Author: Jonathan Kim <jonathan.kim@amd.com> + * + */ + +#include <linux/perf_event.h> +#include <linux/init.h> +#include "amdgpu.h" +#include "amdgpu_pmu.h" +#include "df_v3_6.h" + +#define PMU_NAME_SIZE 32 + +/* record to keep track of pmu entry per pmu type per device */ +struct amdgpu_pmu_entry { + struct list_head entry; + struct amdgpu_device *adev; + struct pmu pmu; + unsigned int pmu_perf_type; +}; + +static LIST_HEAD(amdgpu_pmu_list); + + +/* initialize perf counter */ +static int amdgpu_perf_event_init(struct perf_event *event) +{ + struct hw_perf_event *hwc = &event->hw; + + /* test the event attr type check for PMU enumeration */ + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* update the hw_perf_event struct with config data */ + hwc->conf = event->attr.config; + + return 0; +} + +/* start perf counter */ +static void amdgpu_perf_start(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + struct amdgpu_pmu_entry *pe = container_of(event->pmu, + struct amdgpu_pmu_entry, + pmu); + + if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED))) + return; + + WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE)); + hwc->state = 0; + + switch (pe->pmu_perf_type) { + case PERF_TYPE_AMDGPU_DF: + if (!(flags & PERF_EF_RELOAD)) + pe->adev->df_funcs->pmc_start(pe->adev, hwc->conf, 1); + + pe->adev->df_funcs->pmc_start(pe->adev, hwc->conf, 0); + break; + default: + break; + } + + perf_event_update_userpage(event); + +} + +/* read perf counter */ +static void amdgpu_perf_read(struct perf_event *event) +{ + struct hw_perf_event *hwc = &event->hw; + struct amdgpu_pmu_entry *pe = container_of(event->pmu, + struct amdgpu_pmu_entry, + pmu); + + u64 count, prev; + + do { + prev = local64_read(&hwc->prev_count); + + switch (pe->pmu_perf_type) { + case PERF_TYPE_AMDGPU_DF: + pe->adev->df_funcs->pmc_get_count(pe->adev, hwc->conf, + &count); + break; + default: + count = 0; + break; + }; + } while (local64_cmpxchg(&hwc->prev_count, prev, count) != prev); + + local64_add(count - prev, &event->count); +} + +/* stop perf counter */ +static void amdgpu_perf_stop(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + struct amdgpu_pmu_entry *pe = container_of(event->pmu, + struct amdgpu_pmu_entry, + pmu); + + if (hwc->state & PERF_HES_UPTODATE) + return; + + switch (pe->pmu_perf_type) { + case PERF_TYPE_AMDGPU_DF: + pe->adev->df_funcs->pmc_stop(pe->adev, hwc->conf, 0); + break; + default: + break; + }; + + WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); + hwc->state |= PERF_HES_STOPPED; + + if (hwc->state & PERF_HES_UPTODATE) + return; + + amdgpu_perf_read(event); + hwc->state |= PERF_HES_UPTODATE; +} + +/* add perf counter */ +static int amdgpu_perf_add(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + int retval; + + struct amdgpu_pmu_entry *pe = container_of(event->pmu, + struct amdgpu_pmu_entry, + pmu); + + event->hw.state = PERF_HES_UPTODATE | PERF_HES_STOPPED; + + switch (pe->pmu_perf_type) { + case PERF_TYPE_AMDGPU_DF: + retval = pe->adev->df_funcs->pmc_start(pe->adev, hwc->conf, 1); + break; + default: + return 0; + }; + + if (retval) + return retval; + + if (flags & PERF_EF_START) + amdgpu_perf_start(event, PERF_EF_RELOAD); + + return retval; + +} + +/* delete perf counter */ +static void amdgpu_perf_del(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + struct amdgpu_pmu_entry *pe = container_of(event->pmu, + struct amdgpu_pmu_entry, + pmu); + + amdgpu_perf_stop(event, PERF_EF_UPDATE); + + switch (pe->pmu_perf_type) { + case PERF_TYPE_AMDGPU_DF: + pe->adev->df_funcs->pmc_stop(pe->adev, hwc->conf, 1); + break; + default: + break; + }; + + perf_event_update_userpage(event); +} + +/* vega20 pmus */ + +/* init pmu tracking per pmu type */ +static int init_pmu_by_type(struct amdgpu_device *adev, + const struct attribute_group *attr_groups[], + char *pmu_type_name, char *pmu_file_prefix, + unsigned int pmu_perf_type, + unsigned int num_counters) +{ + char pmu_name[PMU_NAME_SIZE]; + struct amdgpu_pmu_entry *pmu_entry; + int ret = 0; + + pmu_entry = kzalloc(sizeof(struct amdgpu_pmu_entry), GFP_KERNEL); + + if (!pmu_entry) + return -ENOMEM; + + pmu_entry->adev = adev; + pmu_entry->pmu = (struct pmu){ + .event_init = amdgpu_perf_event_init, + .add = amdgpu_perf_add, + .del = amdgpu_perf_del, + .start = amdgpu_perf_start, + .stop = amdgpu_perf_stop, + .read = amdgpu_perf_read, + .task_ctx_nr = perf_invalid_context, + }; + + pmu_entry->pmu.attr_groups = attr_groups; + pmu_entry->pmu_perf_type = pmu_perf_type; + snprintf(pmu_name, PMU_NAME_SIZE, "%s_%d", + pmu_file_prefix, adev->ddev->primary->index); + + ret = perf_pmu_register(&pmu_entry->pmu, pmu_name, -1); + + if (ret) { + kfree(pmu_entry); + pr_warn("Error initializing AMDGPU %s PMUs.\n", pmu_type_name); + return ret; + } + + pr_info("Detected AMDGPU %s Counters. # of Counters = %d.\n", + pmu_type_name, num_counters); + + list_add_tail(&pmu_entry->entry, &amdgpu_pmu_list); + + return 0; +} + +/* init amdgpu_pmu */ +int amdgpu_pmu_init(struct amdgpu_device *adev) +{ + int ret = 0; + + switch (adev->asic_type) { + case CHIP_VEGA20: + /* init df */ + ret = init_pmu_by_type(adev, df_v3_6_attr_groups, + "DF", "amdgpu_df", PERF_TYPE_AMDGPU_DF, + DF_V3_6_MAX_COUNTERS); + + /* other pmu types go here*/ + break; + default: + return 0; + } + + return 0; +} + + +/* destroy all pmu data associated with target device */ +void amdgpu_pmu_fini(struct amdgpu_device *adev) +{ + struct amdgpu_pmu_entry *pe, *temp; + + list_for_each_entry_safe(pe, temp, &amdgpu_pmu_list, entry) { + if (pe->adev == adev) { + list_del(&pe->entry); + perf_pmu_unregister(&pe->pmu); + kfree(pe); + } + } +} |