![Boris Brezillon](/assets/img/avatar_default.png)
The V3D engine has various hardware counters which might be interesting to userspace performance analysis tools. Expose new ioctls to create/destroy a performance monitor object and query the counter values of this perfmance monitor. Note that a perfomance monitor is given an ID that is only valid on the file descriptor it has been allocated from. A performance monitor can be attached to a CL submission and the driver will enable HW counters for this request and update the performance monitor values at the end of the job. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Eric Anholt <eric@anholt.net> Link: https://patchwork.freedesktop.org/patch/msgid/20180112090926.12538-1-boris.brezillon@free-electrons.com
189 lines
4.2 KiB
C
189 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 Broadcom
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*/
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/**
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* DOC: VC4 V3D performance monitor module
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*
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* The V3D block provides 16 hardware counters which can count various events.
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*/
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#include "vc4_drv.h"
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#include "vc4_regs.h"
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#define VC4_PERFMONID_MIN 1
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#define VC4_PERFMONID_MAX U32_MAX
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void vc4_perfmon_get(struct vc4_perfmon *perfmon)
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{
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if (perfmon)
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refcount_inc(&perfmon->refcnt);
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}
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void vc4_perfmon_put(struct vc4_perfmon *perfmon)
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{
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if (perfmon && refcount_dec_and_test(&perfmon->refcnt))
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kfree(perfmon);
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}
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void vc4_perfmon_start(struct vc4_dev *vc4, struct vc4_perfmon *perfmon)
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{
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unsigned int i;
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u32 mask;
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if (WARN_ON_ONCE(!perfmon || vc4->active_perfmon))
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return;
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for (i = 0; i < perfmon->ncounters; i++)
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V3D_WRITE(V3D_PCTRS(i), perfmon->events[i]);
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mask = GENMASK(perfmon->ncounters - 1, 0);
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V3D_WRITE(V3D_PCTRC, mask);
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V3D_WRITE(V3D_PCTRE, V3D_PCTRE_EN | mask);
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vc4->active_perfmon = perfmon;
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}
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void vc4_perfmon_stop(struct vc4_dev *vc4, struct vc4_perfmon *perfmon,
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bool capture)
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{
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unsigned int i;
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if (WARN_ON_ONCE(!vc4->active_perfmon ||
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perfmon != vc4->active_perfmon))
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return;
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if (capture) {
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for (i = 0; i < perfmon->ncounters; i++)
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perfmon->counters[i] += V3D_READ(V3D_PCTR(i));
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}
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V3D_WRITE(V3D_PCTRE, 0);
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vc4->active_perfmon = NULL;
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}
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struct vc4_perfmon *vc4_perfmon_find(struct vc4_file *vc4file, int id)
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{
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struct vc4_perfmon *perfmon;
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mutex_lock(&vc4file->perfmon.lock);
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perfmon = idr_find(&vc4file->perfmon.idr, id);
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vc4_perfmon_get(perfmon);
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mutex_unlock(&vc4file->perfmon.lock);
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return perfmon;
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}
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void vc4_perfmon_open_file(struct vc4_file *vc4file)
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{
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mutex_init(&vc4file->perfmon.lock);
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idr_init(&vc4file->perfmon.idr);
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}
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static int vc4_perfmon_idr_del(int id, void *elem, void *data)
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{
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struct vc4_perfmon *perfmon = elem;
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vc4_perfmon_put(perfmon);
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return 0;
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}
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void vc4_perfmon_close_file(struct vc4_file *vc4file)
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{
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mutex_lock(&vc4file->perfmon.lock);
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idr_for_each(&vc4file->perfmon.idr, vc4_perfmon_idr_del, NULL);
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idr_destroy(&vc4file->perfmon.idr);
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mutex_unlock(&vc4file->perfmon.lock);
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}
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int vc4_perfmon_create_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct vc4_file *vc4file = file_priv->driver_priv;
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struct drm_vc4_perfmon_create *req = data;
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struct vc4_perfmon *perfmon;
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unsigned int i;
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int ret;
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/* Number of monitored counters cannot exceed HW limits. */
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if (req->ncounters > DRM_VC4_MAX_PERF_COUNTERS ||
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!req->ncounters)
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return -EINVAL;
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/* Make sure all events are valid. */
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for (i = 0; i < req->ncounters; i++) {
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if (req->events[i] >= VC4_PERFCNT_NUM_EVENTS)
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return -EINVAL;
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}
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perfmon = kzalloc(sizeof(*perfmon) + (req->ncounters * sizeof(u64)),
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GFP_KERNEL);
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if (!perfmon)
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return -ENOMEM;
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for (i = 0; i < req->ncounters; i++)
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perfmon->events[i] = req->events[i];
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perfmon->ncounters = req->ncounters;
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refcount_set(&perfmon->refcnt, 1);
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mutex_lock(&vc4file->perfmon.lock);
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ret = idr_alloc(&vc4file->perfmon.idr, perfmon, VC4_PERFMONID_MIN,
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VC4_PERFMONID_MAX, GFP_KERNEL);
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mutex_unlock(&vc4file->perfmon.lock);
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if (ret < 0) {
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kfree(perfmon);
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return ret;
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}
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req->id = ret;
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return 0;
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}
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int vc4_perfmon_destroy_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct vc4_file *vc4file = file_priv->driver_priv;
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struct drm_vc4_perfmon_destroy *req = data;
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struct vc4_perfmon *perfmon;
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mutex_lock(&vc4file->perfmon.lock);
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perfmon = idr_remove(&vc4file->perfmon.idr, req->id);
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mutex_unlock(&vc4file->perfmon.lock);
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if (!perfmon)
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return -EINVAL;
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vc4_perfmon_put(perfmon);
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return 0;
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}
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int vc4_perfmon_get_values_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct vc4_file *vc4file = file_priv->driver_priv;
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struct drm_vc4_perfmon_get_values *req = data;
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struct vc4_perfmon *perfmon;
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int ret;
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mutex_lock(&vc4file->perfmon.lock);
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perfmon = idr_find(&vc4file->perfmon.idr, req->id);
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vc4_perfmon_get(perfmon);
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mutex_unlock(&vc4file->perfmon.lock);
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if (!perfmon)
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return -EINVAL;
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if (copy_to_user(u64_to_user_ptr(req->values_ptr), perfmon->counters,
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perfmon->ncounters * sizeof(u64)))
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ret = -EFAULT;
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else
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ret = 0;
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vc4_perfmon_put(perfmon);
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return ret;
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}
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