From 2db609c014958202e067678758c2a5291a28bae5 Mon Sep 17 00:00:00 2001 From: Umesh Nerlige Ramappa Date: Wed, 26 Oct 2022 22:20:54 +0000 Subject: [PATCH] drm/i915/perf: Replace gt->perf.lock with stream->lock for file ops With multi-gt, user can access multiple OA buffers concurrently. Use stream->lock instead of gt->perf.lock to serialize file operations. Signed-off-by: Umesh Nerlige Ramappa Reviewed-by: Ashutosh Dixit Signed-off-by: John Harrison Link: https://patchwork.freedesktop.org/patch/msgid/20221026222102.5526-9-umesh.nerlige.ramappa@intel.com --- drivers/gpu/drm/i915/i915_perf.c | 31 ++++++++++++++----------------- drivers/gpu/drm/i915/i915_perf_types.h | 5 +++++ 2 files changed, 19 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c index 83c5dc0..9a00398 100644 --- a/drivers/gpu/drm/i915/i915_perf.c +++ b/drivers/gpu/drm/i915/i915_perf.c @@ -3231,6 +3231,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream, stream->poll_check_timer.function = oa_poll_check_timer_cb; init_waitqueue_head(&stream->poll_wq); spin_lock_init(&stream->oa_buffer.ptr_lock); + mutex_init(&stream->lock); return 0; @@ -3294,7 +3295,6 @@ static ssize_t i915_perf_read(struct file *file, loff_t *ppos) { struct i915_perf_stream *stream = file->private_data; - struct intel_gt *gt = stream->engine->gt; size_t offset = 0; int ret; @@ -3318,14 +3318,14 @@ static ssize_t i915_perf_read(struct file *file, if (ret) return ret; - mutex_lock(>->perf.lock); + mutex_lock(&stream->lock); ret = stream->ops->read(stream, buf, count, &offset); - mutex_unlock(>->perf.lock); + mutex_unlock(&stream->lock); } while (!offset && !ret); } else { - mutex_lock(>->perf.lock); + mutex_lock(&stream->lock); ret = stream->ops->read(stream, buf, count, &offset); - mutex_unlock(>->perf.lock); + mutex_unlock(&stream->lock); } /* We allow the poll checking to sometimes report false positive EPOLLIN @@ -3372,9 +3372,6 @@ static enum hrtimer_restart oa_poll_check_timer_cb(struct hrtimer *hrtimer) * &i915_perf_stream_ops->poll_wait to call poll_wait() with a wait queue that * will be woken for new stream data. * - * Note: The >->perf.lock mutex has been taken to serialize - * with any non-file-operation driver hooks. - * * Returns: any poll events that are ready without sleeping */ static __poll_t i915_perf_poll_locked(struct i915_perf_stream *stream, @@ -3413,12 +3410,11 @@ static __poll_t i915_perf_poll_locked(struct i915_perf_stream *stream, static __poll_t i915_perf_poll(struct file *file, poll_table *wait) { struct i915_perf_stream *stream = file->private_data; - struct intel_gt *gt = stream->engine->gt; __poll_t ret; - mutex_lock(>->perf.lock); + mutex_lock(&stream->lock); ret = i915_perf_poll_locked(stream, file, wait); - mutex_unlock(>->perf.lock); + mutex_unlock(&stream->lock); return ret; } @@ -3517,9 +3513,6 @@ static long i915_perf_config_locked(struct i915_perf_stream *stream, * @cmd: the ioctl request * @arg: the ioctl data * - * Note: The >->perf.lock mutex has been taken to serialize - * with any non-file-operation driver hooks. - * * Returns: zero on success or a negative error code. Returns -EINVAL for * an unknown ioctl request. */ @@ -3557,12 +3550,11 @@ static long i915_perf_ioctl(struct file *file, unsigned long arg) { struct i915_perf_stream *stream = file->private_data; - struct intel_gt *gt = stream->engine->gt; long ret; - mutex_lock(>->perf.lock); + mutex_lock(&stream->lock); ret = i915_perf_ioctl_locked(stream, cmd, arg); - mutex_unlock(>->perf.lock); + mutex_unlock(&stream->lock); return ret; } @@ -3608,6 +3600,11 @@ static int i915_perf_release(struct inode *inode, struct file *file) struct i915_perf *perf = stream->perf; struct intel_gt *gt = stream->engine->gt; + /* + * Within this call, we know that the fd is being closed and we have no + * other user of stream->lock. Use the perf lock to destroy the stream + * here. + */ mutex_lock(>->perf.lock); i915_perf_destroy_locked(stream); mutex_unlock(>->perf.lock); diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h index e888bfa..dc9bfd8 100644 --- a/drivers/gpu/drm/i915/i915_perf_types.h +++ b/drivers/gpu/drm/i915/i915_perf_types.h @@ -146,6 +146,11 @@ struct i915_perf_stream { */ struct intel_engine_cs *engine; + /* + * Lock associated with operations on stream + */ + struct mutex lock; + /** * @sample_flags: Flags representing the `DRM_I915_PERF_PROP_SAMPLE_*` * properties given when opening a stream, representing the contents -- 2.7.4