[Intel-gfx] [PATCH 03/12] drm/i915: Framework for capturing command stream based OA reports and ctx id info.
Lionel Landwerlin
lionel.g.landwerlin at intel.com
Mon Jul 31 09:43:37 UTC 2017
On 31/07/17 08:59, Sagar Arun Kamble wrote:
> From: Sourab Gupta <sourab.gupta at intel.com>
>
> This patch introduces a framework to capture OA counter reports associated
> with Render command stream. We can then associate the reports captured
> through this mechanism with their corresponding context id's. This can be
> further extended to associate any other metadata information with the
> corresponding samples (since the association with Render command stream
> gives us the ability to capture these information while inserting the
> corresponding capture commands into the command stream).
>
> The OA reports generated in this way are associated with a corresponding
> workload, and thus can be used the delimit the workload (i.e. sample the
> counters at the workload boundaries), within an ongoing stream of periodic
> counter snapshots.
>
> There may be usecases wherein we need more than periodic OA capture mode
> which is supported currently. This mode is primarily used for two usecases:
> - Ability to capture system wide metrics, alongwith the ability to map
> the reports back to individual contexts (particularly for HSW).
> - Ability to inject tags for work, into the reports. This provides
> visibility into the multiple stages of work within single context.
>
> The userspace will be able to distinguish between the periodic and CS based
> OA reports by the virtue of source_info sample field.
>
> The command MI_REPORT_PERF_COUNT can be used to capture snapshots of OA
> counters, and is inserted at BB boundaries.
> The data thus captured will be stored in a separate buffer, which will
> be different from the buffer used otherwise for periodic OA capture mode.
> The metadata information pertaining to snapshot is maintained in a list,
> which also has offsets into the gem buffer object per captured snapshot.
> In order to track whether the gpu has completed processing the node,
> a field pertaining to corresponding gem request is added, which is tracked
> for completion of the command.
>
> Both periodic and CS based reports are associated with a single stream
> (corresponding to render engine), and it is expected to have the samples
> in the sequential order according to their timestamps. Now, since these
> reports are collected in separate buffers, these are merge sorted at the
> time of forwarding to userspace during the read call.
>
> v2: Aligning with the non-perf interface (custom drm ioctl based). Also,
> few related patches are squashed together for better readability
>
> v3: Updated perf sample capture emit hook name. Reserving space upfront
> in the ring for emitting sample capture commands and using
> req->fence.seqno for tracking samples. Added SRCU protection for streams.
> Changed the stream last_request tracking to resv object. (Chris)
> Updated perf.sample_lock spin_lock usage to avoid softlockups. Moved
> stream to global per-engine structure. (Sagar)
> Update unpin and put in the free routines to i915_vma_unpin_and_release.
> Making use of perf stream cs_buffer vma resv instead of separate resv obj.
> Pruned perf stream vma resv during gem_idle. (Chris)
> Changed payload field ctx_id to u64 to keep all sample data aligned at 8
> bytes. (Lionel)
> stall/flush prior to sample capture is not added. Do we need to give this
> control to user to select whether to stall/flush at each sample?
>
> Signed-off-by: Sourab Gupta <sourab.gupta at intel.com>
> Signed-off-by: Robert Bragg <robert at sixbynine.org>
> Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 101 ++-
> drivers/gpu/drm/i915/i915_gem.c | 1 +
> drivers/gpu/drm/i915/i915_gem_execbuffer.c | 8 +
> drivers/gpu/drm/i915/i915_perf.c | 1185 ++++++++++++++++++++++------
> drivers/gpu/drm/i915/intel_engine_cs.c | 4 +
> drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +
> drivers/gpu/drm/i915/intel_ringbuffer.h | 5 +
> include/uapi/drm/i915_drm.h | 15 +
> 8 files changed, 1073 insertions(+), 248 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 2c7456f..8b1cecf 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1985,6 +1985,24 @@ struct i915_perf_stream_ops {
> * The stream will always be disabled before this is called.
> */
> void (*destroy)(struct i915_perf_stream *stream);
> +
> + /*
> + * @emit_sample_capture: Emit the commands in the command streamer
> + * for a particular gpu engine.
> + *
> + * The commands are inserted to capture the perf sample data at
> + * specific points during workload execution, such as before and after
> + * the batch buffer.
> + */
> + void (*emit_sample_capture)(struct i915_perf_stream *stream,
> + struct drm_i915_gem_request *request,
> + bool preallocate);
> +};
> +
> +enum i915_perf_stream_state {
> + I915_PERF_STREAM_DISABLED,
> + I915_PERF_STREAM_ENABLE_IN_PROGRESS,
> + I915_PERF_STREAM_ENABLED,
> };
>
> /**
> @@ -1997,9 +2015,9 @@ struct i915_perf_stream {
> struct drm_i915_private *dev_priv;
>
> /**
> - * @link: Links the stream into ``&drm_i915_private->streams``
> + * @engine: Engine to which this stream corresponds.
> */
> - struct list_head link;
> + struct intel_engine_cs *engine;
>
> /**
> * @sample_flags: Flags representing the `DRM_I915_PERF_PROP_SAMPLE_*`
> @@ -2022,17 +2040,41 @@ struct i915_perf_stream {
> struct i915_gem_context *ctx;
>
> /**
> - * @enabled: Whether the stream is currently enabled, considering
> - * whether the stream was opened in a disabled state and based
> - * on `I915_PERF_IOCTL_ENABLE` and `I915_PERF_IOCTL_DISABLE` calls.
> + * @state: Current stream state, which can be either disabled, enabled,
> + * or enable_in_progress, while considering whether the stream was
> + * opened in a disabled state and based on `I915_PERF_IOCTL_ENABLE` and
> + * `I915_PERF_IOCTL_DISABLE` calls.
> */
> - bool enabled;
> + enum i915_perf_stream_state state;
> +
> + /**
> + * @cs_mode: Whether command stream based perf sample collection is
> + * enabled for this stream
> + */
> + bool cs_mode;
> +
> + /**
> + * @using_oa: Whether OA unit is in use for this particular stream
> + */
> + bool using_oa;
>
> /**
> * @ops: The callbacks providing the implementation of this specific
> * type of configured stream.
> */
> const struct i915_perf_stream_ops *ops;
> +
> + /* Command stream based perf data buffer */
> + struct {
> + struct i915_vma *vma;
> + u8 *vaddr;
> + } cs_buffer;
> +
> + struct list_head cs_samples;
> + spinlock_t cs_samples_lock;
> +
> + wait_queue_head_t poll_wq;
> + bool pollin;
> };
>
> /**
> @@ -2095,7 +2137,8 @@ struct i915_oa_ops {
> int (*read)(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> - size_t *offset);
> + size_t *offset,
> + u32 ts);
>
> /**
> * @oa_hw_tail_read: read the OA tail pointer register
> @@ -2107,6 +2150,36 @@ struct i915_oa_ops {
> u32 (*oa_hw_tail_read)(struct drm_i915_private *dev_priv);
> };
>
> +/*
> + * i915_perf_cs_sample - Sample element to hold info about a single perf
> + * sample data associated with a particular GPU command stream.
> + */
> +struct i915_perf_cs_sample {
> + /**
> + * @link: Links the sample into ``&stream->cs_samples``
> + */
> + struct list_head link;
> +
> + /**
> + * @request: GEM request associated with the sample. The commands to
> + * capture the perf metrics are inserted into the command streamer in
> + * context of this request.
> + */
> + struct drm_i915_gem_request *request;
> +
> + /**
> + * @offset: Offset into ``&stream->cs_buffer``
> + * where the perf metrics will be collected, when the commands inserted
> + * into the command stream are executed by GPU.
> + */
> + u32 offset;
> +
> + /**
> + * @ctx_id: Context ID associated with this perf sample
> + */
> + u32 ctx_id;
> +};
> +
> struct intel_cdclk_state {
> unsigned int cdclk, vco, ref;
> };
> @@ -2431,17 +2504,10 @@ struct drm_i915_private {
> struct ctl_table_header *sysctl_header;
>
> struct mutex lock;
> - struct list_head streams;
> -
> - struct {
> - struct i915_perf_stream *exclusive_stream;
>
> - u32 specific_ctx_id;
> -
> - struct hrtimer poll_check_timer;
> - wait_queue_head_t poll_wq;
> - bool pollin;
> + struct hrtimer poll_check_timer;
>
> + struct {
> /**
> * For rate limiting any notifications of spurious
> * invalid OA reports
> @@ -3636,6 +3702,8 @@ int i915_perf_open_ioctl(struct drm_device *dev, void *data,
> void i915_oa_init_reg_state(struct intel_engine_cs *engine,
> struct i915_gem_context *ctx,
> uint32_t *reg_state);
> +void i915_perf_emit_sample_capture(struct drm_i915_gem_request *req,
> + bool preallocate);
>
> /* i915_gem_evict.c */
> int __must_check i915_gem_evict_something(struct i915_address_space *vm,
> @@ -3795,6 +3863,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
> /* i915_perf.c */
> extern void i915_perf_init(struct drm_i915_private *dev_priv);
> extern void i915_perf_fini(struct drm_i915_private *dev_priv);
> +extern void i915_perf_streams_mark_idle(struct drm_i915_private *dev_priv);
> extern void i915_perf_register(struct drm_i915_private *dev_priv);
> extern void i915_perf_unregister(struct drm_i915_private *dev_priv);
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 000a764..7b01548 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -3220,6 +3220,7 @@ bool i915_gem_unset_wedged(struct drm_i915_private *i915)
>
> intel_engines_mark_idle(dev_priv);
> i915_gem_timelines_mark_idle(dev_priv);
> + i915_perf_streams_mark_idle(dev_priv);
>
> GEM_BUG_ON(!dev_priv->gt.awake);
> dev_priv->gt.awake = false;
> diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> index 5fa4476..bfe546b 100644
> --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
> @@ -1194,12 +1194,16 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
> if (err)
> goto err_request;
>
> + i915_perf_emit_sample_capture(rq, true);
> +
> err = eb->engine->emit_bb_start(rq,
> batch->node.start, PAGE_SIZE,
> cache->gen > 5 ? 0 : I915_DISPATCH_SECURE);
> if (err)
> goto err_request;
>
> + i915_perf_emit_sample_capture(rq, false);
> +
> GEM_BUG_ON(!reservation_object_test_signaled_rcu(batch->resv, true));
> i915_vma_move_to_active(batch, rq, 0);
> reservation_object_lock(batch->resv, NULL);
> @@ -2029,6 +2033,8 @@ static int eb_submit(struct i915_execbuffer *eb)
> return err;
> }
>
> + i915_perf_emit_sample_capture(eb->request, true);
> +
> err = eb->engine->emit_bb_start(eb->request,
> eb->batch->node.start +
> eb->batch_start_offset,
> @@ -2037,6 +2043,8 @@ static int eb_submit(struct i915_execbuffer *eb)
> if (err)
> return err;
>
> + i915_perf_emit_sample_capture(eb->request, false);
> +
> return 0;
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> index b272653..57e1936 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -193,6 +193,7 @@
>
> #include <linux/anon_inodes.h>
> #include <linux/sizes.h>
> +#include <linux/srcu.h>
>
> #include "i915_drv.h"
> #include "i915_oa_hsw.h"
> @@ -288,6 +289,12 @@
> #define OAREPORT_REASON_CTX_SWITCH (1<<3)
> #define OAREPORT_REASON_CLK_RATIO (1<<5)
>
> +/* Data common to periodic and RCS based OA samples */
> +struct i915_perf_sample_data {
> + u64 source;
> + u64 ctx_id;
> + const u8 *report;
> +};
>
> /* For sysctl proc_dointvec_minmax of i915_oa_max_sample_rate
> *
> @@ -328,8 +335,19 @@
> [I915_OA_FORMAT_C4_B8] = { 7, 64 },
> };
>
> +/* Duplicated from similar static enum in i915_gem_execbuffer.c */
> +#define I915_USER_RINGS (4)
> +static const enum intel_engine_id user_ring_map[I915_USER_RINGS + 1] = {
> + [I915_EXEC_DEFAULT] = RCS,
> + [I915_EXEC_RENDER] = RCS,
> + [I915_EXEC_BLT] = BCS,
> + [I915_EXEC_BSD] = VCS,
> + [I915_EXEC_VEBOX] = VECS
> +};
> +
> #define SAMPLE_OA_REPORT (1<<0)
> #define SAMPLE_OA_SOURCE (1<<1)
> +#define SAMPLE_CTX_ID (1<<2)
>
> /**
> * struct perf_open_properties - for validated properties given to open a stream
> @@ -340,6 +358,9 @@
> * @oa_format: An OA unit HW report format
> * @oa_periodic: Whether to enable periodic OA unit sampling
> * @oa_period_exponent: The OA unit sampling period is derived from this
> + * @cs_mode: Whether the stream is configured to enable collection of metrics
> + * associated with command stream of a particular GPU engine
> + * @engine: The GPU engine associated with the stream in case cs_mode is enabled
> *
> * As read_properties_unlocked() enumerates and validates the properties given
> * to open a stream of metrics the configuration is built up in the structure
> @@ -356,6 +377,10 @@ struct perf_open_properties {
> int oa_format;
> bool oa_periodic;
> int oa_period_exponent;
> +
> + /* Command stream mode */
> + bool cs_mode;
> + enum intel_engine_id engine;
> };
>
> static u32 gen8_oa_hw_tail_read(struct drm_i915_private *dev_priv)
> @@ -371,6 +396,266 @@ static u32 gen7_oa_hw_tail_read(struct drm_i915_private *dev_priv)
> }
>
> /**
> + * i915_perf_emit_sample_capture - Insert the commands to capture metrics into
> + * the command stream of a GPU engine.
> + * @request: request in whose context the metrics are being collected.
> + * @preallocate: allocate space in ring for related sample.
> + *
> + * The function provides a hook through which the commands to capture perf
> + * metrics, are inserted into the command stream of a GPU engine.
> + */
> +void i915_perf_emit_sample_capture(struct drm_i915_gem_request *request,
> + bool preallocate)
> +{
> + struct intel_engine_cs *engine = request->engine;
> + struct drm_i915_private *dev_priv = engine->i915;
> + struct i915_perf_stream *stream;
> + int idx;
> +
> + if (!dev_priv->perf.initialized)
> + return;
> +
> + idx = srcu_read_lock(&engine->perf_srcu);
> + stream = srcu_dereference(engine->exclusive_stream, &engine->perf_srcu);
> + if (stream && (stream->state == I915_PERF_STREAM_ENABLED) &&
> + stream->cs_mode)
> + stream->ops->emit_sample_capture(stream, request,
> + preallocate);
> + srcu_read_unlock(&engine->perf_srcu, idx);
> +}
> +
> +/**
> + * release_perf_samples - Release old perf samples to make space for new
> + * sample data.
> + * @stream: Stream from which space is to be freed up.
> + * @target_size: Space required to be freed up.
> + *
> + * We also dereference the associated request before deleting the sample.
> + * Also, no need to check whether the commands associated with old samples
> + * have been completed. This is because these sample entries are anyways going
> + * to be replaced by a new sample, and gpu will eventually overwrite the buffer
> + * contents, when the request associated with new sample completes.
> + */
> +static void release_perf_samples(struct i915_perf_stream *stream,
> + u32 target_size)
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> + struct i915_perf_cs_sample *sample, *next;
> + u32 sample_size = dev_priv->perf.oa.oa_buffer.format_size;
> + u32 size = 0;
> +
> + list_for_each_entry_safe
> + (sample, next, &stream->cs_samples, link) {
> + size += sample_size;
> + i915_gem_request_put(sample->request);
> + list_del(&sample->link);
> + kfree(sample);
> +
> + if (size >= target_size)
> + break;
> + }
> +}
> +
> +/**
> + * insert_perf_sample - Insert a perf sample entry to the sample list.
> + * @stream: Stream into which sample is to be inserted.
> + * @sample: perf CS sample to be inserted into the list
> + *
> + * This function never fails, since it always manages to insert the sample.
> + * If the space is exhausted in the buffer, it will remove the older
> + * entries in order to make space.
> + */
> +static void insert_perf_sample(struct i915_perf_stream *stream,
> + struct i915_perf_cs_sample *sample)
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> + struct i915_perf_cs_sample *first, *last;
> + int max_offset = stream->cs_buffer.vma->obj->base.size;
> + u32 sample_size = dev_priv->perf.oa.oa_buffer.format_size;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&stream->cs_samples_lock, flags);
> + if (list_empty(&stream->cs_samples)) {
> + sample->offset = 0;
> + list_add_tail(&sample->link, &stream->cs_samples);
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> + return;
> + }
> +
> + first = list_first_entry(&stream->cs_samples, typeof(*first),
> + link);
> + last = list_last_entry(&stream->cs_samples, typeof(*last),
> + link);
> +
> + if (last->offset >= first->offset) {
> + /* Sufficient space available at the end of buffer? */
> + if (last->offset + 2*sample_size < max_offset)
> + sample->offset = last->offset + sample_size;
> + /*
> + * Wraparound condition. Is sufficient space available at
> + * beginning of buffer?
> + */
> + else if (sample_size < first->offset)
> + sample->offset = 0;
> + /* Insufficient space. Overwrite existing old entries */
> + else {
> + u32 target_size = sample_size - first->offset;
> +
> + release_perf_samples(stream, target_size);
> + sample->offset = 0;
> + }
> + } else {
> + /* Sufficient space available? */
> + if (last->offset + 2*sample_size < first->offset)
> + sample->offset = last->offset + sample_size;
> + /* Insufficient space. Overwrite existing old entries */
> + else {
> + u32 target_size = sample_size -
> + (first->offset - last->offset -
> + sample_size);
> +
> + release_perf_samples(stream, target_size);
> + sample->offset = last->offset + sample_size;
> + }
> + }
> + list_add_tail(&sample->link, &stream->cs_samples);
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> +}
> +
> +/**
> + * i915_emit_oa_report_capture - Insert the commands to capture OA
> + * reports metrics into the render command stream
> + * @request: request in whose context the metrics are being collected.
> + * @preallocate: allocate space in ring for related sample.
> + * @offset: command stream buffer offset where the OA metrics need to be
> + * collected
> + */
> +static int i915_emit_oa_report_capture(
> + struct drm_i915_gem_request *request,
> + bool preallocate,
> + u32 offset)
> +{
> + struct drm_i915_private *dev_priv = request->i915;
> + struct intel_engine_cs *engine = request->engine;
> + struct i915_perf_stream *stream;
> + u32 addr = 0;
> + u32 cmd, len = 4, *cs;
> + int idx;
> +
> + idx = srcu_read_lock(&engine->perf_srcu);
> + stream = srcu_dereference(engine->exclusive_stream, &engine->perf_srcu);
> + addr = stream->cs_buffer.vma->node.start + offset;
> + srcu_read_unlock(&engine->perf_srcu, idx);
> +
> + if (WARN_ON(addr & 0x3f)) {
> + DRM_ERROR("OA buffer address not aligned to 64 byte\n");
> + return -EINVAL;
> + }
> +
> + if (preallocate)
> + request->reserved_space += len;
> + else
> + request->reserved_space -= len;
> +
> + cs = intel_ring_begin(request, 4);
> + if (IS_ERR(cs))
> + return PTR_ERR(cs);
> +
> + cmd = MI_REPORT_PERF_COUNT | (1<<0);
> + if (INTEL_GEN(dev_priv) >= 8)
> + cmd |= (2<<0);
> +
> + *cs++ = cmd;
> + *cs++ = addr | MI_REPORT_PERF_COUNT_GGTT;
> + *cs++ = request->fence.seqno;
> +
> + if (INTEL_GEN(dev_priv) >= 8)
> + *cs++ = 0;
> + else
> + *cs++ = MI_NOOP;
> +
> + intel_ring_advance(request, cs);
> +
> + return 0;
> +}
> +
> +/**
> + * i915_perf_stream_emit_sample_capture - Insert the commands to capture perf
> + * metrics into the GPU command stream
> + * @stream: An i915-perf stream opened for GPU metrics
> + * @request: request in whose context the metrics are being collected.
> + * @preallocate: allocate space in ring for related sample.
> + */
> +static void i915_perf_stream_emit_sample_capture(
> + struct i915_perf_stream *stream,
> + struct drm_i915_gem_request *request,
> + bool preallocate)
> +{
> + struct reservation_object *resv = stream->cs_buffer.vma->resv;
> + struct i915_perf_cs_sample *sample;
> + unsigned long flags;
> + int ret;
> +
> + sample = kzalloc(sizeof(*sample), GFP_KERNEL);
> + if (sample == NULL) {
> + DRM_ERROR("Perf sample alloc failed\n");
> + return;
> + }
> +
> + sample->request = i915_gem_request_get(request);
> + sample->ctx_id = request->ctx->hw_id;
> +
> + insert_perf_sample(stream, sample);
> +
> + if (stream->sample_flags & SAMPLE_OA_REPORT) {
> + ret = i915_emit_oa_report_capture(request,
> + preallocate,
> + sample->offset);
> + if (ret)
> + goto err_unref;
> + }
> +
> + reservation_object_lock(resv, NULL);
> + if (reservation_object_reserve_shared(resv) == 0)
> + reservation_object_add_shared_fence(resv, &request->fence);
> + reservation_object_unlock(resv);
> +
> + i915_vma_move_to_active(stream->cs_buffer.vma, request,
> + EXEC_OBJECT_WRITE);
> + return;
> +
> +err_unref:
> + i915_gem_request_put(sample->request);
> + spin_lock_irqsave(&stream->cs_samples_lock, flags);
> + list_del(&sample->link);
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> + kfree(sample);
> +}
> +
> +/**
> + * i915_perf_stream_release_samples - Release the perf command stream samples
> + * @stream: Stream from which sample are to be released.
> + *
> + * Note: The associated requests should be completed before releasing the
> + * references here.
> + */
> +static void i915_perf_stream_release_samples(struct i915_perf_stream *stream)
> +{
> + struct i915_perf_cs_sample *entry, *next;
> + unsigned long flags;
> +
> + list_for_each_entry_safe
> + (entry, next, &stream->cs_samples, link) {
> + i915_gem_request_put(entry->request);
> +
> + spin_lock_irqsave(&stream->cs_samples_lock, flags);
> + list_del(&entry->link);
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> + kfree(entry);
> + }
> +}
> +
> +/**
> * oa_buffer_check_unlocked - check for data and update tail ptr state
> * @dev_priv: i915 device instance
> *
> @@ -521,12 +806,13 @@ static int append_oa_status(struct i915_perf_stream *stream,
> }
>
> /**
> - * append_oa_sample - Copies single OA report into userspace read() buffer.
> - * @stream: An i915-perf stream opened for OA metrics
> + * append_perf_sample - Copies single perf sample into userspace read() buffer.
> + * @stream: An i915-perf stream opened for perf samples
> * @buf: destination buffer given by userspace
> * @count: the number of bytes userspace wants to read
> * @offset: (inout): the current position for writing into @buf
> - * @report: A single OA report to (optionally) include as part of the sample
> + * @data: perf sample data which contains (optionally) metrics configured
> + * earlier when opening a stream
> *
> * The contents of a sample are configured through `DRM_I915_PERF_PROP_SAMPLE_*`
> * properties when opening a stream, tracked as `stream->sample_flags`. This
> @@ -537,11 +823,11 @@ static int append_oa_status(struct i915_perf_stream *stream,
> *
> * Returns: 0 on success, negative error code on failure.
> */
> -static int append_oa_sample(struct i915_perf_stream *stream,
> +static int append_perf_sample(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> size_t *offset,
> - const u8 *report)
> + const struct i915_perf_sample_data *data)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> int report_size = dev_priv->perf.oa.oa_buffer.format_size;
> @@ -569,16 +855,21 @@ static int append_oa_sample(struct i915_perf_stream *stream,
> * transition. These are considered as source 'OABUFFER'.
> */
> if (sample_flags & SAMPLE_OA_SOURCE) {
> - u64 source = I915_PERF_SAMPLE_OA_SOURCE_OABUFFER;
> + if (copy_to_user(buf, &data->source, 8))
> + return -EFAULT;
> + buf += 8;
> + }
>
> - if (copy_to_user(buf, &source, 8))
> + if (sample_flags & SAMPLE_CTX_ID) {
> + if (copy_to_user(buf, &data->ctx_id, 8))
> return -EFAULT;
> buf += 8;
> }
>
> if (sample_flags & SAMPLE_OA_REPORT) {
> - if (copy_to_user(buf, report, report_size))
> + if (copy_to_user(buf, data->report, report_size))
> return -EFAULT;
> + buf += report_size;
> }
>
> (*offset) += header.size;
> @@ -587,11 +878,54 @@ static int append_oa_sample(struct i915_perf_stream *stream,
> }
>
> /**
> + * append_oa_buffer_sample - Copies single periodic OA report into userspace
> + * read() buffer.
> + * @stream: An i915-perf stream opened for OA metrics
> + * @buf: destination buffer given by userspace
> + * @count: the number of bytes userspace wants to read
> + * @offset: (inout): the current position for writing into @buf
> + * @report: A single OA report to (optionally) include as part of the sample
> + *
> + * Returns: 0 on success, negative error code on failure.
> + */
> +static int append_oa_buffer_sample(struct i915_perf_stream *stream,
> + char __user *buf, size_t count,
> + size_t *offset, const u8 *report)
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> + u32 sample_flags = stream->sample_flags;
> + struct i915_perf_sample_data data = { 0 };
> + u32 *report32 = (u32 *)report;
> +
> + if (sample_flags & SAMPLE_OA_SOURCE)
> + data.source = I915_PERF_SAMPLE_OA_SOURCE_OABUFFER;
> +
> + if (sample_flags & SAMPLE_CTX_ID) {
> + if (INTEL_INFO(dev_priv)->gen < 8)
> + data.ctx_id = 0;
> + else {
> + /*
> + * XXX: Just keep the lower 21 bits for now since I'm
> + * not entirely sure if the HW touches any of the higher
> + * bits in this field
> + */
> + data.ctx_id = report32[2] & 0x1fffff;
> + }
> + }
> +
> + if (sample_flags & SAMPLE_OA_REPORT)
> + data.report = report;
> +
> + return append_perf_sample(stream, buf, count, offset, &data);
> +}
> +
> +/**
> * Copies all buffered OA reports into userspace read() buffer.
> * @stream: An i915-perf stream opened for OA metrics
> * @buf: destination buffer given by userspace
> * @count: the number of bytes userspace wants to read
> * @offset: (inout): the current position for writing into @buf
> + * @ts: copy OA reports till this timestamp
> *
> * Notably any error condition resulting in a short read (-%ENOSPC or
> * -%EFAULT) will be returned even though one or more records may
> @@ -609,7 +943,8 @@ static int append_oa_sample(struct i915_perf_stream *stream,
> static int gen8_append_oa_reports(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> - size_t *offset)
> + size_t *offset,
> + u32 ts)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> int report_size = dev_priv->perf.oa.oa_buffer.format_size;
> @@ -623,7 +958,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
> u32 taken;
> int ret = 0;
>
> - if (WARN_ON(!stream->enabled))
> + if (WARN_ON(stream->state != I915_PERF_STREAM_ENABLED))
> return -EIO;
>
> spin_lock_irqsave(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags);
> @@ -669,6 +1004,11 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
> u32 *report32 = (void *)report;
> u32 ctx_id;
> u32 reason;
> + u32 report_ts = report32[1];
> +
> + /* Report timestamp should not exceed the given ts */
> + if (report_ts > ts)
> + break;
>
> /*
> * All the report sizes factor neatly into the buffer
> @@ -750,23 +1090,23 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
> * switches since it's not-uncommon for periodic samples to
> * identify a switch before any 'context switch' report.
> */
> - if (!dev_priv->perf.oa.exclusive_stream->ctx ||
> - dev_priv->perf.oa.specific_ctx_id == ctx_id ||
> + if (!stream->ctx ||
> + stream->engine->specific_ctx_id == ctx_id ||
> (dev_priv->perf.oa.oa_buffer.last_ctx_id ==
> - dev_priv->perf.oa.specific_ctx_id) ||
> + stream->engine->specific_ctx_id) ||
> reason & OAREPORT_REASON_CTX_SWITCH) {
>
> /*
> * While filtering for a single context we avoid
> * leaking the IDs of other contexts.
> */
> - if (dev_priv->perf.oa.exclusive_stream->ctx &&
> - dev_priv->perf.oa.specific_ctx_id != ctx_id) {
> + if (stream->ctx &&
> + stream->engine->specific_ctx_id != ctx_id) {
> report32[2] = INVALID_CTX_ID;
> }
>
> - ret = append_oa_sample(stream, buf, count, offset,
> - report);
> + ret = append_oa_buffer_sample(stream, buf, count,
> + offset, report);
> if (ret)
> break;
>
> @@ -807,6 +1147,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
> * @buf: destination buffer given by userspace
> * @count: the number of bytes userspace wants to read
> * @offset: (inout): the current position for writing into @buf
> + * @ts: copy OA reports till this timestamp
> *
> * Checks OA unit status registers and if necessary appends corresponding
> * status records for userspace (such as for a buffer full condition) and then
> @@ -824,7 +1165,8 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
> static int gen8_oa_read(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> - size_t *offset)
> + size_t *offset,
> + u32 ts)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> u32 oastatus;
> @@ -877,7 +1219,7 @@ static int gen8_oa_read(struct i915_perf_stream *stream,
> oastatus & ~GEN8_OASTATUS_REPORT_LOST);
> }
>
> - return gen8_append_oa_reports(stream, buf, count, offset);
> + return gen8_append_oa_reports(stream, buf, count, offset, ts);
> }
>
> /**
> @@ -886,6 +1228,7 @@ static int gen8_oa_read(struct i915_perf_stream *stream,
> * @buf: destination buffer given by userspace
> * @count: the number of bytes userspace wants to read
> * @offset: (inout): the current position for writing into @buf
> + * @ts: copy OA reports till this timestamp
> *
> * Notably any error condition resulting in a short read (-%ENOSPC or
> * -%EFAULT) will be returned even though one or more records may
> @@ -903,7 +1246,8 @@ static int gen8_oa_read(struct i915_perf_stream *stream,
> static int gen7_append_oa_reports(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> - size_t *offset)
> + size_t *offset,
> + u32 ts)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> int report_size = dev_priv->perf.oa.oa_buffer.format_size;
> @@ -917,7 +1261,7 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
> u32 taken;
> int ret = 0;
>
> - if (WARN_ON(!stream->enabled))
> + if (WARN_ON(stream->state != I915_PERF_STREAM_ENABLED))
> return -EIO;
>
> spin_lock_irqsave(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags);
> @@ -984,7 +1328,12 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
> continue;
> }
>
> - ret = append_oa_sample(stream, buf, count, offset, report);
> + /* Report timestamp should not exceed the given ts */
> + if (report32[1] > ts)
> + break;
> +
> + ret = append_oa_buffer_sample(stream, buf, count, offset,
> + report);
> if (ret)
> break;
>
> @@ -1022,6 +1371,7 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
> * @buf: destination buffer given by userspace
> * @count: the number of bytes userspace wants to read
> * @offset: (inout): the current position for writing into @buf
> + * @ts: copy OA reports till this timestamp
> *
> * Checks Gen 7 specific OA unit status registers and if necessary appends
> * corresponding status records for userspace (such as for a buffer full
> @@ -1035,7 +1385,8 @@ static int gen7_append_oa_reports(struct i915_perf_stream *stream,
> static int gen7_oa_read(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> - size_t *offset)
> + size_t *offset,
> + u32 ts)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> u32 oastatus1;
> @@ -1097,16 +1448,172 @@ static int gen7_oa_read(struct i915_perf_stream *stream,
> GEN7_OASTATUS1_REPORT_LOST;
> }
>
> - return gen7_append_oa_reports(stream, buf, count, offset);
> + return gen7_append_oa_reports(stream, buf, count, offset, ts);
> +}
> +
> +/**
> + * append_cs_buffer_sample - Copies single perf sample data associated with
> + * GPU command stream, into userspace read() buffer.
> + * @stream: An i915-perf stream opened for perf CS metrics
> + * @buf: destination buffer given by userspace
> + * @count: the number of bytes userspace wants to read
> + * @offset: (inout): the current position for writing into @buf
> + * @node: Sample data associated with perf metrics
> + *
> + * Returns: 0 on success, negative error code on failure.
> + */
> +static int append_cs_buffer_sample(struct i915_perf_stream *stream,
> + char __user *buf,
> + size_t count,
> + size_t *offset,
> + struct i915_perf_cs_sample *node)
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> + struct i915_perf_sample_data data = { 0 };
> + u32 sample_flags = stream->sample_flags;
> + int ret = 0;
> +
> + if (sample_flags & SAMPLE_OA_REPORT) {
> + const u8 *report = stream->cs_buffer.vaddr + node->offset;
> + u32 sample_ts = *(u32 *)(report + 4);
> +
> + data.report = report;
> +
> + /* First, append the periodic OA samples having lower
> + * timestamp values
> + */
> + ret = dev_priv->perf.oa.ops.read(stream, buf, count, offset,
> + sample_ts);
> + if (ret)
> + return ret;
> + }
> +
> + if (sample_flags & SAMPLE_OA_SOURCE)
> + data.source = I915_PERF_SAMPLE_OA_SOURCE_CS;
> +
> + if (sample_flags & SAMPLE_CTX_ID)
> + data.ctx_id = node->ctx_id;
> +
> + return append_perf_sample(stream, buf, count, offset, &data);
> }
>
> /**
> - * i915_oa_wait_unlocked - handles blocking IO until OA data available
> + * append_cs_buffer_samples: Copies all command stream based perf samples
> + * into userspace read() buffer.
> + * @stream: An i915-perf stream opened for perf CS metrics
> + * @buf: destination buffer given by userspace
> + * @count: the number of bytes userspace wants to read
> + * @offset: (inout): the current position for writing into @buf
> + *
> + * Notably any error condition resulting in a short read (-%ENOSPC or
> + * -%EFAULT) will be returned even though one or more records may
> + * have been successfully copied. In this case it's up to the caller
> + * to decide if the error should be squashed before returning to
> + * userspace.
> + *
> + * Returns: 0 on success, negative error code on failure.
> + */
> +static int append_cs_buffer_samples(struct i915_perf_stream *stream,
> + char __user *buf,
> + size_t count,
> + size_t *offset)
> +{
> + struct i915_perf_cs_sample *entry, *next;
> + LIST_HEAD(free_list);
> + int ret = 0;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&stream->cs_samples_lock, flags);
> + if (list_empty(&stream->cs_samples)) {
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> + return 0;
> + }
> + list_for_each_entry_safe(entry, next,
> + &stream->cs_samples, link) {
> + if (!i915_gem_request_completed(entry->request))
> + break;
> + list_move_tail(&entry->link, &free_list);
> + }
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> +
> + if (list_empty(&free_list))
> + return 0;
> +
> + list_for_each_entry_safe(entry, next, &free_list, link) {
> + ret = append_cs_buffer_sample(stream, buf, count, offset,
> + entry);
> + if (ret)
> + break;
> +
> + list_del(&entry->link);
> + i915_gem_request_put(entry->request);
> + kfree(entry);
> + }
> +
> + /* Don't discard remaining entries, keep them for next read */
> + spin_lock_irqsave(&stream->cs_samples_lock, flags);
> + list_splice(&free_list, &stream->cs_samples);
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> +
> + return ret;
> +}
> +
> +/*
> + * cs_buffer_is_empty - Checks whether the command stream buffer
> + * associated with the stream has data available.
> * @stream: An i915-perf stream opened for OA metrics
> *
> + * Returns: true if atleast one request associated with command stream is
> + * completed, else returns false.
> + */
> +static bool cs_buffer_is_empty(struct i915_perf_stream *stream)
> +
> +{
> + struct i915_perf_cs_sample *entry = NULL;
> + struct drm_i915_gem_request *request = NULL;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&stream->cs_samples_lock, flags);
> + entry = list_first_entry_or_null(&stream->cs_samples,
> + struct i915_perf_cs_sample, link);
> + if (entry)
> + request = entry->request;
> + spin_unlock_irqrestore(&stream->cs_samples_lock, flags);
> +
> + if (!entry)
> + return true;
> + else if (!i915_gem_request_completed(request))
> + return true;
> + else
> + return false;
> +}
> +
> +/**
> + * stream_have_data_unlocked - Checks whether the stream has data available
> + * @stream: An i915-perf stream opened for OA metrics
> + *
> + * For command stream based streams, check if the command stream buffer has
> + * atleast one sample available, if not return false, irrespective of periodic
> + * oa buffer having the data or not.
> + */
> +
> +static bool stream_have_data_unlocked(struct i915_perf_stream *stream)
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> +
> + if (stream->cs_mode)
> + return !cs_buffer_is_empty(stream);
> + else
> + return oa_buffer_check_unlocked(dev_priv);
> +}
> +
> +/**
> + * i915_perf_stream_wait_unlocked - handles blocking IO until data available
> + * @stream: An i915-perf stream opened for GPU metrics
> + *
> * Called when userspace tries to read() from a blocking stream FD opened
> - * for OA metrics. It waits until the hrtimer callback finds a non-empty
> - * OA buffer and wakes us.
> + * for perf metrics. It waits until the hrtimer callback finds a non-empty
> + * command stream buffer / OA buffer and wakes us.
> *
> * Note: it's acceptable to have this return with some false positives
> * since any subsequent read handling will return -EAGAIN if there isn't
> @@ -1114,7 +1621,7 @@ static int gen7_oa_read(struct i915_perf_stream *stream,
> *
> * Returns: zero on success or a negative error code
> */
> -static int i915_oa_wait_unlocked(struct i915_perf_stream *stream)
> +static int i915_perf_stream_wait_unlocked(struct i915_perf_stream *stream)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
>
> @@ -1122,32 +1629,47 @@ static int i915_oa_wait_unlocked(struct i915_perf_stream *stream)
> if (!dev_priv->perf.oa.periodic)
> return -EIO;
>
> - return wait_event_interruptible(dev_priv->perf.oa.poll_wq,
> - oa_buffer_check_unlocked(dev_priv));
> + if (stream->cs_mode) {
> + long int ret;
> +
> + /* Wait for the all sampled requests. */
> + ret = reservation_object_wait_timeout_rcu(
> + stream->cs_buffer.vma->resv,
> + true,
> + true,
> + MAX_SCHEDULE_TIMEOUT);
> + if (unlikely(ret < 0)) {
> + DRM_DEBUG_DRIVER("Failed to wait for sampled requests: %li\n", ret);
> + return ret;
> + }
> + }
> +
> + return wait_event_interruptible(stream->poll_wq,
> + stream_have_data_unlocked(stream));
> }
>
> /**
> - * i915_oa_poll_wait - call poll_wait() for an OA stream poll()
> - * @stream: An i915-perf stream opened for OA metrics
> + * i915_perf_stream_poll_wait - call poll_wait() for an stream poll()
> + * @stream: An i915-perf stream opened for GPU metrics
> * @file: An i915 perf stream file
> * @wait: poll() state table
> *
> - * For handling userspace polling on an i915 perf stream opened for OA metrics,
> + * For handling userspace polling on an i915 perf stream opened for metrics,
> * this starts a poll_wait with the wait queue that our hrtimer callback wakes
> - * when it sees data ready to read in the circular OA buffer.
> + * when it sees data ready to read either in command stream buffer or in the
> + * circular OA buffer.
> */
> -static void i915_oa_poll_wait(struct i915_perf_stream *stream,
> +static void i915_perf_stream_poll_wait(struct i915_perf_stream *stream,
> struct file *file,
> poll_table *wait)
> {
> - struct drm_i915_private *dev_priv = stream->dev_priv;
> -
> - poll_wait(file, &dev_priv->perf.oa.poll_wq, wait);
> + poll_wait(file, &stream->poll_wq, wait);
> }
>
> /**
> - * i915_oa_read - just calls through to &i915_oa_ops->read
> - * @stream: An i915-perf stream opened for OA metrics
> + * i915_perf_stream_read - Reads perf metrics available into userspace read
> + * buffer
> + * @stream: An i915-perf stream opened for GPU metrics
> * @buf: destination buffer given by userspace
> * @count: the number of bytes userspace wants to read
> * @offset: (inout): the current position for writing into @buf
> @@ -1157,14 +1679,21 @@ static void i915_oa_poll_wait(struct i915_perf_stream *stream,
> *
> * Returns: zero on success or a negative error code
> */
> -static int i915_oa_read(struct i915_perf_stream *stream,
> +static int i915_perf_stream_read(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> size_t *offset)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
>
> - return dev_priv->perf.oa.ops.read(stream, buf, count, offset);
> +
Does the following code mean that a perf stream is either in cs_mode or
OA mode?
I couldn't see that condition in the function processing the opening
parameters.
The comments in the patch description also says :
"Both periodic and CS based reports are associated with a single stream"
The following code seems to contradict that. Can you explain how it works?
Thanks
> + if (stream->cs_mode)
> + return append_cs_buffer_samples(stream, buf, count, offset);
> + else if (stream->sample_flags & SAMPLE_OA_REPORT)
> + return dev_priv->perf.oa.ops.read(stream, buf, count, offset,
> + U32_MAX);
> + else
> + return -EINVAL;
> }
>
> /**
> @@ -1182,7 +1711,7 @@ static int oa_get_render_ctx_id(struct i915_perf_stream *stream)
> struct drm_i915_private *dev_priv = stream->dev_priv;
>
> if (i915.enable_execlists)
> - dev_priv->perf.oa.specific_ctx_id = stream->ctx->hw_id;
> + stream->engine->specific_ctx_id = stream->ctx->hw_id;
> else {
> struct intel_engine_cs *engine = dev_priv->engine[RCS];
> struct intel_ring *ring;
> @@ -1209,7 +1738,7 @@ static int oa_get_render_ctx_id(struct i915_perf_stream *stream)
> * i915_ggtt_offset() on the fly) considering the difference
> * with gen8+ and execlists
> */
> - dev_priv->perf.oa.specific_ctx_id =
> + stream->engine->specific_ctx_id =
> i915_ggtt_offset(stream->ctx->engine[engine->id].state);
> }
>
> @@ -1228,13 +1757,13 @@ static void oa_put_render_ctx_id(struct i915_perf_stream *stream)
> struct drm_i915_private *dev_priv = stream->dev_priv;
>
> if (i915.enable_execlists) {
> - dev_priv->perf.oa.specific_ctx_id = INVALID_CTX_ID;
> + stream->engine->specific_ctx_id = INVALID_CTX_ID;
> } else {
> struct intel_engine_cs *engine = dev_priv->engine[RCS];
>
> mutex_lock(&dev_priv->drm.struct_mutex);
>
> - dev_priv->perf.oa.specific_ctx_id = INVALID_CTX_ID;
> + stream->engine->specific_ctx_id = INVALID_CTX_ID;
> engine->context_unpin(engine, stream->ctx);
>
> mutex_unlock(&dev_priv->drm.struct_mutex);
> @@ -1242,13 +1771,28 @@ static void oa_put_render_ctx_id(struct i915_perf_stream *stream)
> }
>
> static void
> +free_cs_buffer(struct i915_perf_stream *stream)
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> +
> + mutex_lock(&dev_priv->drm.struct_mutex);
> +
> + i915_gem_object_unpin_map(stream->cs_buffer.vma->obj);
> + i915_vma_unpin_and_release(&stream->cs_buffer.vma);
> +
> + stream->cs_buffer.vma = NULL;
> + stream->cs_buffer.vaddr = NULL;
> +
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> +}
> +
> +static void
> free_oa_buffer(struct drm_i915_private *i915)
> {
> mutex_lock(&i915->drm.struct_mutex);
>
> i915_gem_object_unpin_map(i915->perf.oa.oa_buffer.vma->obj);
> - i915_vma_unpin(i915->perf.oa.oa_buffer.vma);
> - i915_gem_object_put(i915->perf.oa.oa_buffer.vma->obj);
> + i915_vma_unpin_and_release(&i915->perf.oa.oa_buffer.vma);
>
> i915->perf.oa.oa_buffer.vma = NULL;
> i915->perf.oa.oa_buffer.vaddr = NULL;
> @@ -1256,27 +1800,41 @@ static void oa_put_render_ctx_id(struct i915_perf_stream *stream)
> mutex_unlock(&i915->drm.struct_mutex);
> }
>
> -static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
> +static void i915_perf_stream_destroy(struct i915_perf_stream *stream)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> -
> - BUG_ON(stream != dev_priv->perf.oa.exclusive_stream);
> + struct intel_engine_cs *engine = stream->engine;
> + struct i915_perf_stream *engine_stream;
> + int idx;
> +
> + idx = srcu_read_lock(&engine->perf_srcu);
> + engine_stream = srcu_dereference(engine->exclusive_stream,
> + &engine->perf_srcu);
> + if (WARN_ON(stream != engine_stream))
> + return;
> + srcu_read_unlock(&engine->perf_srcu, idx);
>
> /*
> * Unset exclusive_stream first, it might be checked while
> * disabling the metric set on gen8+.
> */
> - dev_priv->perf.oa.exclusive_stream = NULL;
> + rcu_assign_pointer(stream->engine->exclusive_stream, NULL);
> + synchronize_srcu(&stream->engine->perf_srcu);
>
> - dev_priv->perf.oa.ops.disable_metric_set(dev_priv);
> + if (stream->using_oa) {
> + dev_priv->perf.oa.ops.disable_metric_set(dev_priv);
>
> - free_oa_buffer(dev_priv);
> + free_oa_buffer(dev_priv);
>
> - intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
> - intel_runtime_pm_put(dev_priv);
> + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
> + intel_runtime_pm_put(dev_priv);
>
> - if (stream->ctx)
> - oa_put_render_ctx_id(stream);
> + if (stream->ctx)
> + oa_put_render_ctx_id(stream);
> + }
> +
> + if (stream->cs_mode)
> + free_cs_buffer(stream);
>
> if (dev_priv->perf.oa.spurious_report_rs.missed) {
> DRM_NOTE("%d spurious OA report notices suppressed due to ratelimiting\n",
> @@ -1325,11 +1883,6 @@ static void gen7_init_oa_buffer(struct drm_i915_private *dev_priv)
> * memory...
> */
> memset(dev_priv->perf.oa.oa_buffer.vaddr, 0, OA_BUFFER_SIZE);
> -
> - /* Maybe make ->pollin per-stream state if we support multiple
> - * concurrent streams in the future.
> - */
> - dev_priv->perf.oa.pollin = false;
> }
>
> static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
> @@ -1383,33 +1936,26 @@ static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
> * memory...
> */
> memset(dev_priv->perf.oa.oa_buffer.vaddr, 0, OA_BUFFER_SIZE);
> -
> - /*
> - * Maybe make ->pollin per-stream state if we support multiple
> - * concurrent streams in the future.
> - */
> - dev_priv->perf.oa.pollin = false;
> }
>
> -static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
> +static int alloc_obj(struct drm_i915_private *dev_priv,
> + struct i915_vma **vma, u8 **vaddr)
> {
> struct drm_i915_gem_object *bo;
> - struct i915_vma *vma;
> int ret;
>
> - if (WARN_ON(dev_priv->perf.oa.oa_buffer.vma))
> - return -ENODEV;
> + intel_runtime_pm_get(dev_priv);
>
> ret = i915_mutex_lock_interruptible(&dev_priv->drm);
> if (ret)
> - return ret;
> + goto out;
>
> BUILD_BUG_ON_NOT_POWER_OF_2(OA_BUFFER_SIZE);
> BUILD_BUG_ON(OA_BUFFER_SIZE < SZ_128K || OA_BUFFER_SIZE > SZ_16M);
>
> bo = i915_gem_object_create(dev_priv, OA_BUFFER_SIZE);
> if (IS_ERR(bo)) {
> - DRM_ERROR("Failed to allocate OA buffer\n");
> + DRM_ERROR("Failed to allocate i915 perf obj\n");
> ret = PTR_ERR(bo);
> goto unlock;
> }
> @@ -1419,42 +1965,83 @@ static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
> goto err_unref;
>
> /* PreHSW required 512K alignment, HSW requires 16M */
> - vma = i915_gem_object_ggtt_pin(bo, NULL, 0, SZ_16M, 0);
> - if (IS_ERR(vma)) {
> - ret = PTR_ERR(vma);
> + *vma = i915_gem_object_ggtt_pin(bo, NULL, 0, SZ_16M, 0);
> + if (IS_ERR(*vma)) {
> + ret = PTR_ERR(*vma);
> goto err_unref;
> }
> - dev_priv->perf.oa.oa_buffer.vma = vma;
>
> - dev_priv->perf.oa.oa_buffer.vaddr =
> - i915_gem_object_pin_map(bo, I915_MAP_WB);
> - if (IS_ERR(dev_priv->perf.oa.oa_buffer.vaddr)) {
> - ret = PTR_ERR(dev_priv->perf.oa.oa_buffer.vaddr);
> + *vaddr = i915_gem_object_pin_map(bo, I915_MAP_WB);
> + if (IS_ERR(*vaddr)) {
> + ret = PTR_ERR(*vaddr);
> goto err_unpin;
> }
>
> - dev_priv->perf.oa.ops.init_oa_buffer(dev_priv);
> -
> - DRM_DEBUG_DRIVER("OA Buffer initialized, gtt offset = 0x%x, vaddr = %p\n",
> - i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma),
> - dev_priv->perf.oa.oa_buffer.vaddr);
> -
> goto unlock;
>
> err_unpin:
> - __i915_vma_unpin(vma);
> + i915_vma_unpin(*vma);
>
> err_unref:
> i915_gem_object_put(bo);
>
> - dev_priv->perf.oa.oa_buffer.vaddr = NULL;
> - dev_priv->perf.oa.oa_buffer.vma = NULL;
> -
> unlock:
> mutex_unlock(&dev_priv->drm.struct_mutex);
> +out:
> + intel_runtime_pm_put(dev_priv);
> return ret;
> }
>
> +static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
> +{
> + struct i915_vma *vma;
> + u8 *vaddr;
> + int ret;
> +
> + if (WARN_ON(dev_priv->perf.oa.oa_buffer.vma))
> + return -ENODEV;
> +
> + ret = alloc_obj(dev_priv, &vma, &vaddr);
> + if (ret)
> + return ret;
> +
> + dev_priv->perf.oa.oa_buffer.vma = vma;
> + dev_priv->perf.oa.oa_buffer.vaddr = vaddr;
> +
> + dev_priv->perf.oa.ops.init_oa_buffer(dev_priv);
> +
> + DRM_DEBUG_DRIVER("OA Buffer initialized, gtt offset = 0x%x, vaddr = %p",
> + i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma),
> + dev_priv->perf.oa.oa_buffer.vaddr);
> + return 0;
> +}
> +
> +static int alloc_cs_buffer(struct i915_perf_stream *stream)
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> + struct i915_vma *vma;
> + u8 *vaddr;
> + int ret;
> +
> + if (WARN_ON(stream->cs_buffer.vma))
> + return -ENODEV;
> +
> + ret = alloc_obj(dev_priv, &vma, &vaddr);
> + if (ret)
> + return ret;
> +
> + stream->cs_buffer.vma = vma;
> + stream->cs_buffer.vaddr = vaddr;
> + if (WARN_ON(!list_empty(&stream->cs_samples)))
> + INIT_LIST_HEAD(&stream->cs_samples);
> +
> + DRM_DEBUG_DRIVER("Command stream buf initialized, gtt offset = 0x%x, vaddr = %p",
> + i915_ggtt_offset(stream->cs_buffer.vma),
> + stream->cs_buffer.vaddr);
> +
> + return 0;
> +}
> +
> static void config_oa_regs(struct drm_i915_private *dev_priv,
> const struct i915_oa_reg *regs,
> int n_regs)
> @@ -1859,6 +2446,10 @@ static void gen8_disable_metric_set(struct drm_i915_private *dev_priv)
>
> static void gen7_oa_enable(struct drm_i915_private *dev_priv)
> {
> + struct i915_perf_stream *stream;
> + struct intel_engine_cs *engine = dev_priv->engine[RCS];
> + int idx;
> +
> /*
> * Reset buf pointers so we don't forward reports from before now.
> *
> @@ -1870,11 +2461,11 @@ static void gen7_oa_enable(struct drm_i915_private *dev_priv)
> */
> gen7_init_oa_buffer(dev_priv);
>
> - if (dev_priv->perf.oa.exclusive_stream->enabled) {
> - struct i915_gem_context *ctx =
> - dev_priv->perf.oa.exclusive_stream->ctx;
> - u32 ctx_id = dev_priv->perf.oa.specific_ctx_id;
> -
> + idx = srcu_read_lock(&engine->perf_srcu);
> + stream = srcu_dereference(engine->exclusive_stream, &engine->perf_srcu);
> + if (stream->state != I915_PERF_STREAM_DISABLED) {
> + struct i915_gem_context *ctx = stream->ctx;
> + u32 ctx_id = engine->specific_ctx_id;
> bool periodic = dev_priv->perf.oa.periodic;
> u32 period_exponent = dev_priv->perf.oa.period_exponent;
> u32 report_format = dev_priv->perf.oa.oa_buffer.format;
> @@ -1889,6 +2480,7 @@ static void gen7_oa_enable(struct drm_i915_private *dev_priv)
> GEN7_OACONTROL_ENABLE);
> } else
> I915_WRITE(GEN7_OACONTROL, 0);
> + srcu_read_unlock(&engine->perf_srcu, idx);
> }
>
> static void gen8_oa_enable(struct drm_i915_private *dev_priv)
> @@ -1917,22 +2509,23 @@ static void gen8_oa_enable(struct drm_i915_private *dev_priv)
> }
>
> /**
> - * i915_oa_stream_enable - handle `I915_PERF_IOCTL_ENABLE` for OA stream
> - * @stream: An i915 perf stream opened for OA metrics
> + * i915_perf_stream_enable - handle `I915_PERF_IOCTL_ENABLE` for perf stream
> + * @stream: An i915 perf stream opened for GPU metrics
> *
> * [Re]enables hardware periodic sampling according to the period configured
> * when opening the stream. This also starts a hrtimer that will periodically
> * check for data in the circular OA buffer for notifying userspace (e.g.
> * during a read() or poll()).
> */
> -static void i915_oa_stream_enable(struct i915_perf_stream *stream)
> +static void i915_perf_stream_enable(struct i915_perf_stream *stream)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
>
> - dev_priv->perf.oa.ops.oa_enable(dev_priv);
> + if (stream->sample_flags & SAMPLE_OA_REPORT)
> + dev_priv->perf.oa.ops.oa_enable(dev_priv);
>
> - if (dev_priv->perf.oa.periodic)
> - hrtimer_start(&dev_priv->perf.oa.poll_check_timer,
> + if (stream->cs_mode || dev_priv->perf.oa.periodic)
> + hrtimer_start(&dev_priv->perf.poll_check_timer,
> ns_to_ktime(POLL_PERIOD),
> HRTIMER_MODE_REL_PINNED);
> }
> @@ -1948,34 +2541,39 @@ static void gen8_oa_disable(struct drm_i915_private *dev_priv)
> }
>
> /**
> - * i915_oa_stream_disable - handle `I915_PERF_IOCTL_DISABLE` for OA stream
> - * @stream: An i915 perf stream opened for OA metrics
> + * i915_perf_stream_disable - handle `I915_PERF_IOCTL_DISABLE` for perf stream
> + * @stream: An i915 perf stream opened for GPU metrics
> *
> * Stops the OA unit from periodically writing counter reports into the
> * circular OA buffer. This also stops the hrtimer that periodically checks for
> * data in the circular OA buffer, for notifying userspace.
> */
> -static void i915_oa_stream_disable(struct i915_perf_stream *stream)
> +static void i915_perf_stream_disable(struct i915_perf_stream *stream)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
>
> - dev_priv->perf.oa.ops.oa_disable(dev_priv);
> + if (stream->cs_mode || dev_priv->perf.oa.periodic)
> + hrtimer_cancel(&dev_priv->perf.poll_check_timer);
> +
> + if (stream->cs_mode)
> + i915_perf_stream_release_samples(stream);
>
> - if (dev_priv->perf.oa.periodic)
> - hrtimer_cancel(&dev_priv->perf.oa.poll_check_timer);
> + if (stream->sample_flags & SAMPLE_OA_REPORT)
> + dev_priv->perf.oa.ops.oa_disable(dev_priv);
> }
>
> -static const struct i915_perf_stream_ops i915_oa_stream_ops = {
> - .destroy = i915_oa_stream_destroy,
> - .enable = i915_oa_stream_enable,
> - .disable = i915_oa_stream_disable,
> - .wait_unlocked = i915_oa_wait_unlocked,
> - .poll_wait = i915_oa_poll_wait,
> - .read = i915_oa_read,
> +static const struct i915_perf_stream_ops perf_stream_ops = {
> + .destroy = i915_perf_stream_destroy,
> + .enable = i915_perf_stream_enable,
> + .disable = i915_perf_stream_disable,
> + .wait_unlocked = i915_perf_stream_wait_unlocked,
> + .poll_wait = i915_perf_stream_poll_wait,
> + .read = i915_perf_stream_read,
> + .emit_sample_capture = i915_perf_stream_emit_sample_capture,
> };
>
> /**
> - * i915_oa_stream_init - validate combined props for OA stream and init
> + * i915_perf_stream_init - validate combined props for stream and init
> * @stream: An i915 perf stream
> * @param: The open parameters passed to `DRM_I915_PERF_OPEN`
> * @props: The property state that configures stream (individually validated)
> @@ -1984,58 +2582,35 @@ static void i915_oa_stream_disable(struct i915_perf_stream *stream)
> * doesn't ensure that the combination necessarily makes sense.
> *
> * At this point it has been determined that userspace wants a stream of
> - * OA metrics, but still we need to further validate the combined
> + * perf metrics, but still we need to further validate the combined
> * properties are OK.
> *
> * If the configuration makes sense then we can allocate memory for
> - * a circular OA buffer and apply the requested metric set configuration.
> + * a circular perf buffer and apply the requested metric set configuration.
> *
> * Returns: zero on success or a negative error code.
> */
> -static int i915_oa_stream_init(struct i915_perf_stream *stream,
> +static int i915_perf_stream_init(struct i915_perf_stream *stream,
> struct drm_i915_perf_open_param *param,
> struct perf_open_properties *props)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> - int format_size;
> + bool require_oa_unit = props->sample_flags & (SAMPLE_OA_REPORT |
> + SAMPLE_OA_SOURCE);
> + bool cs_sample_data = props->sample_flags & SAMPLE_OA_REPORT;
> + struct i915_perf_stream *curr_stream;
> + struct intel_engine_cs *engine = NULL;
> + int idx;
> int ret;
>
> - /* If the sysfs metrics/ directory wasn't registered for some
> - * reason then don't let userspace try their luck with config
> - * IDs
> - */
> - if (!dev_priv->perf.metrics_kobj) {
> - DRM_DEBUG("OA metrics weren't advertised via sysfs\n");
> - return -EINVAL;
> - }
> -
> - if (!(props->sample_flags & SAMPLE_OA_REPORT)) {
> - DRM_DEBUG("Only OA report sampling supported\n");
> - return -EINVAL;
> - }
> -
> - if (!dev_priv->perf.oa.ops.init_oa_buffer) {
> - DRM_DEBUG("OA unit not supported\n");
> - return -ENODEV;
> - }
> -
> - /* To avoid the complexity of having to accurately filter
> - * counter reports and marshal to the appropriate client
> - * we currently only allow exclusive access
> - */
> - if (dev_priv->perf.oa.exclusive_stream) {
> - DRM_DEBUG("OA unit already in use\n");
> - return -EBUSY;
> - }
> -
> - if (!props->metrics_set) {
> - DRM_DEBUG("OA metric set not specified\n");
> - return -EINVAL;
> - }
> -
> - if (!props->oa_format) {
> - DRM_DEBUG("OA report format not specified\n");
> - return -EINVAL;
> + if ((props->sample_flags & SAMPLE_CTX_ID) && !props->cs_mode) {
> + if (IS_HASWELL(dev_priv)) {
> + DRM_ERROR("On HSW, context ID sampling only supported via command stream\n");
> + return -EINVAL;
> + } else if (!i915.enable_execlists) {
> + DRM_ERROR("On Gen8+ without execlists, context ID sampling only supported via command stream\n");
> + return -EINVAL;
> + }
> }
>
> /* We set up some ratelimit state to potentially throttle any _NOTES
> @@ -2060,70 +2635,167 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
>
> stream->sample_size = sizeof(struct drm_i915_perf_record_header);
>
> - format_size = dev_priv->perf.oa.oa_formats[props->oa_format].size;
> + if (require_oa_unit) {
> + int format_size;
>
> - stream->sample_flags |= SAMPLE_OA_REPORT;
> - stream->sample_size += format_size;
> + /* If the sysfs metrics/ directory wasn't registered for some
> + * reason then don't let userspace try their luck with config
> + * IDs
> + */
> + if (!dev_priv->perf.metrics_kobj) {
> + DRM_DEBUG("OA metrics weren't advertised via sysfs\n");
> + return -EINVAL;
> + }
>
> - if (props->sample_flags & SAMPLE_OA_SOURCE) {
> - stream->sample_flags |= SAMPLE_OA_SOURCE;
> - stream->sample_size += 8;
> - }
> + if (!dev_priv->perf.oa.ops.init_oa_buffer) {
> + DRM_DEBUG("OA unit not supported\n");
> + return -ENODEV;
> + }
>
> - dev_priv->perf.oa.oa_buffer.format_size = format_size;
> - if (WARN_ON(dev_priv->perf.oa.oa_buffer.format_size == 0))
> - return -EINVAL;
> + if (!props->metrics_set) {
> + DRM_DEBUG("OA metric set not specified\n");
> + return -EINVAL;
> + }
> +
> + if (!props->oa_format) {
> + DRM_DEBUG("OA report format not specified\n");
> + return -EINVAL;
> + }
> +
> + if (props->cs_mode && (props->engine != RCS)) {
> + DRM_ERROR("Command stream OA metrics only available via Render CS\n");
> + return -EINVAL;
> + }
> +
> + engine = dev_priv->engine[RCS];
> + stream->using_oa = true;
> +
> + idx = srcu_read_lock(&engine->perf_srcu);
> + curr_stream = srcu_dereference(engine->exclusive_stream,
> + &engine->perf_srcu);
> + if (curr_stream) {
> + DRM_ERROR("Stream already opened\n");
> + ret = -EINVAL;
> + goto err_enable;
> + }
> + srcu_read_unlock(&engine->perf_srcu, idx);
> +
> + format_size =
> + dev_priv->perf.oa.oa_formats[props->oa_format].size;
> +
> + if (props->sample_flags & SAMPLE_OA_REPORT) {
> + stream->sample_flags |= SAMPLE_OA_REPORT;
> + stream->sample_size += format_size;
> + }
> +
> + if (props->sample_flags & SAMPLE_OA_SOURCE) {
> + if (!(props->sample_flags & SAMPLE_OA_REPORT)) {
> + DRM_ERROR("OA source type can't be sampled without OA report\n");
> + return -EINVAL;
> + }
> + stream->sample_flags |= SAMPLE_OA_SOURCE;
> + stream->sample_size += 8;
> + }
> +
> + dev_priv->perf.oa.oa_buffer.format_size = format_size;
> + if (WARN_ON(dev_priv->perf.oa.oa_buffer.format_size == 0))
> + return -EINVAL;
> +
> + dev_priv->perf.oa.oa_buffer.format =
> + dev_priv->perf.oa.oa_formats[props->oa_format].format;
> +
> + dev_priv->perf.oa.metrics_set = props->metrics_set;
>
> - dev_priv->perf.oa.oa_buffer.format =
> - dev_priv->perf.oa.oa_formats[props->oa_format].format;
> + dev_priv->perf.oa.periodic = props->oa_periodic;
> + if (dev_priv->perf.oa.periodic)
> + dev_priv->perf.oa.period_exponent =
> + props->oa_period_exponent;
>
> - dev_priv->perf.oa.metrics_set = props->metrics_set;
> + if (stream->ctx) {
> + ret = oa_get_render_ctx_id(stream);
> + if (ret)
> + return ret;
> + }
>
> - dev_priv->perf.oa.periodic = props->oa_periodic;
> - if (dev_priv->perf.oa.periodic)
> - dev_priv->perf.oa.period_exponent = props->oa_period_exponent;
> + /* PRM - observability performance counters:
> + *
> + * OACONTROL, performance counter enable, note:
> + *
> + * "When this bit is set, in order to have coherent counts,
> + * RC6 power state and trunk clock gating must be disabled.
> + * This can be achieved by programming MMIO registers as
> + * 0xA094=0 and 0xA090[31]=1"
> + *
> + * In our case we are expecting that taking pm + FORCEWAKE
> + * references will effectively disable RC6.
> + */
> + intel_runtime_pm_get(dev_priv);
> + intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
>
> - if (stream->ctx) {
> - ret = oa_get_render_ctx_id(stream);
> + ret = alloc_oa_buffer(dev_priv);
> if (ret)
> - return ret;
> + goto err_oa_buf_alloc;
> +
> + ret = dev_priv->perf.oa.ops.enable_metric_set(dev_priv);
> + if (ret)
> + goto err_enable;
> }
>
> - /* PRM - observability performance counters:
> - *
> - * OACONTROL, performance counter enable, note:
> - *
> - * "When this bit is set, in order to have coherent counts,
> - * RC6 power state and trunk clock gating must be disabled.
> - * This can be achieved by programming MMIO registers as
> - * 0xA094=0 and 0xA090[31]=1"
> - *
> - * In our case we are expecting that taking pm + FORCEWAKE
> - * references will effectively disable RC6.
> - */
> - intel_runtime_pm_get(dev_priv);
> - intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
> + if (props->sample_flags & SAMPLE_CTX_ID) {
> + stream->sample_flags |= SAMPLE_CTX_ID;
> + stream->sample_size += 8;
> + }
>
> - ret = alloc_oa_buffer(dev_priv);
> - if (ret)
> - goto err_oa_buf_alloc;
> + if (props->cs_mode) {
> + if (!cs_sample_data) {
> + DRM_ERROR("Stream engine given without requesting any CS data to sample\n");
> + ret = -EINVAL;
> + goto err_enable;
> + }
>
> - ret = dev_priv->perf.oa.ops.enable_metric_set(dev_priv);
> - if (ret)
> - goto err_enable;
> + if (!(props->sample_flags & SAMPLE_CTX_ID)) {
> + DRM_ERROR("Stream engine given without requesting any CS specific property\n");
> + ret = -EINVAL;
> + goto err_enable;
> + }
>
> - stream->ops = &i915_oa_stream_ops;
> + engine = dev_priv->engine[props->engine];
>
> - dev_priv->perf.oa.exclusive_stream = stream;
> + idx = srcu_read_lock(&engine->perf_srcu);
> + curr_stream = srcu_dereference(engine->exclusive_stream,
> + &engine->perf_srcu);
> + if (curr_stream) {
> + DRM_ERROR("Stream already opened\n");
> + ret = -EINVAL;
> + goto err_enable;
> + }
> + srcu_read_unlock(&engine->perf_srcu, idx);
> +
> + INIT_LIST_HEAD(&stream->cs_samples);
> + ret = alloc_cs_buffer(stream);
> + if (ret)
> + goto err_enable;
> +
> + stream->cs_mode = true;
> + }
> +
> + init_waitqueue_head(&stream->poll_wq);
> + stream->pollin = false;
> + stream->ops = &perf_stream_ops;
> + stream->engine = engine;
> + rcu_assign_pointer(engine->exclusive_stream, stream);
>
> return 0;
>
> err_enable:
> - free_oa_buffer(dev_priv);
> + if (require_oa_unit)
> + free_oa_buffer(dev_priv);
>
> err_oa_buf_alloc:
> - intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
> - intel_runtime_pm_put(dev_priv);
> + if (require_oa_unit) {
> + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
> + intel_runtime_pm_put(dev_priv);
> + }
> if (stream->ctx)
> oa_put_render_ctx_id(stream);
>
> @@ -2219,7 +2891,7 @@ static ssize_t i915_perf_read(struct file *file,
> * disabled stream as an error. In particular it might otherwise lead
> * to a deadlock for blocking file descriptors...
> */
> - if (!stream->enabled)
> + if (stream->state == I915_PERF_STREAM_DISABLED)
> return -EIO;
>
> if (!(file->f_flags & O_NONBLOCK)) {
> @@ -2254,25 +2926,32 @@ static ssize_t i915_perf_read(struct file *file,
> * effectively ensures we back off until the next hrtimer callback
> * before reporting another POLLIN event.
> */
> - if (ret >= 0 || ret == -EAGAIN) {
> - /* Maybe make ->pollin per-stream state if we support multiple
> - * concurrent streams in the future.
> - */
> - dev_priv->perf.oa.pollin = false;
> - }
> + if (ret >= 0 || ret == -EAGAIN)
> + stream->pollin = false;
>
> return ret;
> }
>
> -static enum hrtimer_restart oa_poll_check_timer_cb(struct hrtimer *hrtimer)
> +static enum hrtimer_restart poll_check_timer_cb(struct hrtimer *hrtimer)
> {
> + struct i915_perf_stream *stream;
> struct drm_i915_private *dev_priv =
> container_of(hrtimer, typeof(*dev_priv),
> - perf.oa.poll_check_timer);
> -
> - if (oa_buffer_check_unlocked(dev_priv)) {
> - dev_priv->perf.oa.pollin = true;
> - wake_up(&dev_priv->perf.oa.poll_wq);
> + perf.poll_check_timer);
> + int idx;
> + struct intel_engine_cs *engine;
> + enum intel_engine_id id;
> +
> + for_each_engine(engine, dev_priv, id) {
> + idx = srcu_read_lock(&engine->perf_srcu);
> + stream = srcu_dereference(engine->exclusive_stream,
> + &engine->perf_srcu);
> + if (stream && (stream->state == I915_PERF_STREAM_ENABLED) &&
> + stream_have_data_unlocked(stream)) {
> + stream->pollin = true;
> + wake_up(&stream->poll_wq);
> + }
> + srcu_read_unlock(&engine->perf_srcu, idx);
> }
>
> hrtimer_forward_now(hrtimer, ns_to_ktime(POLL_PERIOD));
> @@ -2311,7 +2990,7 @@ static unsigned int i915_perf_poll_locked(struct drm_i915_private *dev_priv,
> * the hrtimer/oa_poll_check_timer_cb to notify us when there are
> * samples to read.
> */
> - if (dev_priv->perf.oa.pollin)
> + if (stream->pollin)
> events |= POLLIN;
>
> return events;
> @@ -2355,14 +3034,16 @@ static unsigned int i915_perf_poll(struct file *file, poll_table *wait)
> */
> static void i915_perf_enable_locked(struct i915_perf_stream *stream)
> {
> - if (stream->enabled)
> + if (stream->state != I915_PERF_STREAM_DISABLED)
> return;
>
> /* Allow stream->ops->enable() to refer to this */
> - stream->enabled = true;
> + stream->state = I915_PERF_STREAM_ENABLE_IN_PROGRESS;
>
> if (stream->ops->enable)
> stream->ops->enable(stream);
> +
> + stream->state = I915_PERF_STREAM_ENABLED;
> }
>
> /**
> @@ -2381,11 +3062,11 @@ static void i915_perf_enable_locked(struct i915_perf_stream *stream)
> */
> static void i915_perf_disable_locked(struct i915_perf_stream *stream)
> {
> - if (!stream->enabled)
> + if (stream->state != I915_PERF_STREAM_ENABLED)
> return;
>
> /* Allow stream->ops->disable() to refer to this */
> - stream->enabled = false;
> + stream->state = I915_PERF_STREAM_DISABLED;
>
> if (stream->ops->disable)
> stream->ops->disable(stream);
> @@ -2457,14 +3138,12 @@ static long i915_perf_ioctl(struct file *file,
> */
> static void i915_perf_destroy_locked(struct i915_perf_stream *stream)
> {
> - if (stream->enabled)
> + if (stream->state == I915_PERF_STREAM_ENABLED)
> i915_perf_disable_locked(stream);
>
> if (stream->ops->destroy)
> stream->ops->destroy(stream);
>
> - list_del(&stream->link);
> -
> if (stream->ctx)
> i915_gem_context_put(stream->ctx);
>
> @@ -2524,7 +3203,7 @@ static int i915_perf_release(struct inode *inode, struct file *file)
> *
> * In the case where userspace is interested in OA unit metrics then further
> * config validation and stream initialization details will be handled by
> - * i915_oa_stream_init(). The code here should only validate config state that
> + * i915_perf_stream_init(). The code here should only validate config state that
> * will be relevant to all stream types / backends.
> *
> * Returns: zero on success or a negative error code.
> @@ -2593,7 +3272,7 @@ static int i915_perf_release(struct inode *inode, struct file *file)
> stream->dev_priv = dev_priv;
> stream->ctx = specific_ctx;
>
> - ret = i915_oa_stream_init(stream, param, props);
> + ret = i915_perf_stream_init(stream, param, props);
> if (ret)
> goto err_alloc;
>
> @@ -2606,8 +3285,6 @@ static int i915_perf_release(struct inode *inode, struct file *file)
> goto err_flags;
> }
>
> - list_add(&stream->link, &dev_priv->perf.streams);
> -
> if (param->flags & I915_PERF_FLAG_FD_CLOEXEC)
> f_flags |= O_CLOEXEC;
> if (param->flags & I915_PERF_FLAG_FD_NONBLOCK)
> @@ -2625,7 +3302,6 @@ static int i915_perf_release(struct inode *inode, struct file *file)
> return stream_fd;
>
> err_open:
> - list_del(&stream->link);
> err_flags:
> if (stream->ops->destroy)
> stream->ops->destroy(stream);
> @@ -2774,6 +3450,29 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
> case DRM_I915_PERF_PROP_SAMPLE_OA_SOURCE:
> props->sample_flags |= SAMPLE_OA_SOURCE;
> break;
> + case DRM_I915_PERF_PROP_ENGINE: {
> + unsigned int user_ring_id =
> + value & I915_EXEC_RING_MASK;
> + enum intel_engine_id engine;
> +
> + if (user_ring_id > I915_USER_RINGS)
> + return -EINVAL;
> +
> + /* XXX: Currently only RCS is supported.
> + * Remove this check when support for other
> + * engines is added
> + */
> + engine = user_ring_map[user_ring_id];
> + if (engine != RCS)
> + return -EINVAL;
> +
> + props->cs_mode = true;
> + props->engine = engine;
> + }
> + break;
> + case DRM_I915_PERF_PROP_SAMPLE_CTX_ID:
> + props->sample_flags |= SAMPLE_CTX_ID;
> + break;
> case DRM_I915_PERF_PROP_MAX:
> MISSING_CASE(id);
> return -EINVAL;
> @@ -3002,6 +3701,30 @@ void i915_perf_unregister(struct drm_i915_private *dev_priv)
> {}
> };
>
> +void i915_perf_streams_mark_idle(struct drm_i915_private *dev_priv)
> +{
> + struct intel_engine_cs *engine;
> + struct i915_perf_stream *stream;
> + enum intel_engine_id id;
> + int idx;
> +
> + for_each_engine(engine, dev_priv, id) {
> + idx = srcu_read_lock(&engine->perf_srcu);
> + stream = srcu_dereference(engine->exclusive_stream,
> + &engine->perf_srcu);
> + if (stream && (stream->state == I915_PERF_STREAM_ENABLED) &&
> + stream->cs_mode) {
> + struct reservation_object *resv =
> + stream->cs_buffer.vma->resv;
> +
> + reservation_object_lock(resv, NULL);
> + reservation_object_add_excl_fence(resv, NULL);
> + reservation_object_unlock(resv);
> + }
> + srcu_read_unlock(&engine->perf_srcu, idx);
> + }
> +}
> +
> /**
> * i915_perf_init - initialize i915-perf state on module load
> * @dev_priv: i915 device instance
> @@ -3125,12 +3848,10 @@ void i915_perf_init(struct drm_i915_private *dev_priv)
> }
>
> if (dev_priv->perf.oa.n_builtin_sets) {
> - hrtimer_init(&dev_priv->perf.oa.poll_check_timer,
> + hrtimer_init(&dev_priv->perf.poll_check_timer,
> CLOCK_MONOTONIC, HRTIMER_MODE_REL);
> - dev_priv->perf.oa.poll_check_timer.function = oa_poll_check_timer_cb;
> - init_waitqueue_head(&dev_priv->perf.oa.poll_wq);
> + dev_priv->perf.poll_check_timer.function = poll_check_timer_cb;
>
> - INIT_LIST_HEAD(&dev_priv->perf.streams);
> mutex_init(&dev_priv->perf.lock);
> spin_lock_init(&dev_priv->perf.oa.oa_buffer.ptr_lock);
>
> diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
> index 9ab5969..1a2e843 100644
> --- a/drivers/gpu/drm/i915/intel_engine_cs.c
> +++ b/drivers/gpu/drm/i915/intel_engine_cs.c
> @@ -317,6 +317,10 @@ int intel_engines_init(struct drm_i915_private *dev_priv)
> goto cleanup;
>
> GEM_BUG_ON(!engine->submit_request);
> +
> + /* Perf stream related initialization for Engine */
> + rcu_assign_pointer(engine->exclusive_stream, NULL);
> + init_srcu_struct(&engine->perf_srcu);
> }
>
> return 0;
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index cdf084e..4333623 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -1622,6 +1622,8 @@ void intel_engine_cleanup(struct intel_engine_cs *engine)
>
> intel_engine_cleanup_common(engine);
>
> + cleanup_srcu_struct(&engine->perf_srcu);
> +
> dev_priv->engine[engine->id] = NULL;
> kfree(engine);
> }
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
> index d33c934..0ac8491 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.h
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
> @@ -441,6 +441,11 @@ struct intel_engine_cs {
> * certain bits to encode the command length in the header).
> */
> u32 (*get_cmd_length_mask)(u32 cmd_header);
> +
> + /* Global per-engine stream */
> + struct srcu_struct perf_srcu;
> + struct i915_perf_stream __rcu *exclusive_stream;
> + u32 specific_ctx_id;
> };
>
> static inline unsigned int
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index a1314c5..768b1a5 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1350,6 +1350,7 @@ enum drm_i915_oa_format {
>
> enum drm_i915_perf_sample_oa_source {
> I915_PERF_SAMPLE_OA_SOURCE_OABUFFER,
> + I915_PERF_SAMPLE_OA_SOURCE_CS,
> I915_PERF_SAMPLE_OA_SOURCE_MAX /* non-ABI */
> };
>
> @@ -1394,6 +1395,19 @@ enum drm_i915_perf_property_id {
> */
> DRM_I915_PERF_PROP_SAMPLE_OA_SOURCE,
>
> + /**
> + * The value of this property specifies the GPU engine for which
> + * the samples need to be collected. Specifying this property also
> + * implies the command stream based sample collection.
> + */
> + DRM_I915_PERF_PROP_ENGINE,
> +
> + /**
> + * The value of this property set to 1 requests inclusion of context ID
> + * in the perf sample data.
> + */
> + DRM_I915_PERF_PROP_SAMPLE_CTX_ID,
> +
> DRM_I915_PERF_PROP_MAX /* non-ABI */
> };
>
> @@ -1460,6 +1474,7 @@ enum drm_i915_perf_record_type {
> * struct drm_i915_perf_record_header header;
> *
> * { u64 source; } && DRM_I915_PERF_PROP_SAMPLE_OA_SOURCE
> + * { u64 ctx_id; } && DRM_I915_PERF_PROP_SAMPLE_CTX_ID
> * { u32 oa_report[]; } && DRM_I915_PERF_PROP_SAMPLE_OA
> * };
> */
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