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drm/i915/perf: Replace gt->perf.lock with stream->lock for file ops

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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 <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221026222102.5526-9-umesh.nerlige.ramappa@intel.com
This commit is contained in:
Umesh Nerlige Ramappa 2022-10-26 22:20:54 +00:00 committed by John Harrison
parent 9677a9f3b1
commit 2db609c014
2 changed files with 19 additions and 17 deletions
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31
drivers/gpu/drm/i915/i915_perf.c
View File

@ -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(&gt->perf.lock);
mutex_lock(&stream->lock);
ret = stream->ops->read(stream, buf, count, &offset);
mutex_unlock(&gt->perf.lock);
mutex_unlock(&stream->lock);
} while (!offset && !ret);
} else {
mutex_lock(&gt->perf.lock);
mutex_lock(&stream->lock);
ret = stream->ops->read(stream, buf, count, &offset);
mutex_unlock(&gt->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 &gt->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(&gt->perf.lock);
mutex_lock(&stream->lock);
ret = i915_perf_poll_locked(stream, file, wait);
mutex_unlock(&gt->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 &gt->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(&gt->perf.lock);
mutex_lock(&stream->lock);
ret = i915_perf_ioctl_locked(stream, cmd, arg);
mutex_unlock(&gt->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(&gt->perf.lock);
i915_perf_destroy_locked(stream);
mutex_unlock(&gt->perf.lock);

5
drivers/gpu/drm/i915/i915_perf_types.h
View File

@ -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