@@ -2100,6 +2100,14 @@ static int eb_oa_config(struct i915_execbuffer *eb)
if (!eb->oa_config)
return 0;
+ /*
+ * If the perf stream was opened with hold preemption, flag the
+ * request properly so that the priority of the request is bumped once
+ * it reaches the execlist ports.
+ */
+ if (eb->i915->perf.oa.exclusive_stream->hold_preemption)
+ eb->request->has_perf = true;
+
/*
* If the config hasn't changed, skip reconfiguring the HW (this is
* subject to a delay we want to avoid has much as possible).
@@ -683,6 +683,12 @@ static void port_assign(struct execlist_port *port, struct i915_request *rq)
if (port_isset(port))
i915_request_put(port_request(port));
+ if (rq->has_perf) {
+ rq->sched.attr.priority =
+ (I915_PRIORITY_MASK & rq->sched.attr.priority) |
+ I915_USER_PRIORITY(I915_PRIORITY_PERF);
+ }
+
port_set(port, port_pack(i915_request_get(rq), port_count(port)));
}
@@ -476,7 +476,7 @@ static int i915_getparam_ioctl(struct drm_device *dev, void *data,
value = INTEL_INFO(dev_priv)->has_coherent_ggtt;
break;
case I915_PARAM_PERF_REVISION:
- value = 1;
+ value = 2;
break;
case I915_PARAM_HAS_EXEC_PERF_CONFIG:
/* Obviously requires perf support. */
@@ -1396,6 +1396,14 @@ struct i915_perf_stream {
*/
bool enabled;
+ /**
+ * @hold_preemption: Whether preemption is put on hold for command
+ * submissions done on the @ctx. This is useful for some drivers that
+ * cannot easily post process the OA buffer context to subtract delta
+ * of performance counters not associated with @ctx.
+ */
+ bool hold_preemption;
+
/**
* @ops: The callbacks providing the implementation of this specific
* type of configured stream.
@@ -343,6 +343,8 @@ static const struct i915_oa_format gen8_plus_oa_formats[I915_OA_FORMAT_MAX] = {
* struct perf_open_properties - for validated properties given to open a stream
* @sample_flags: `DRM_I915_PERF_PROP_SAMPLE_*` properties are tracked as flags
* @single_context: Whether a single or all gpu contexts should be monitored
+ * @hold_preemption: Whether the preemption is disabled for the filtered
+ * context
* @ctx_handle: A gem ctx handle for use with @single_context
* @metrics_set: An ID for an OA unit metric set advertised via sysfs
* @oa_format: An OA unit HW report format
@@ -357,6 +359,7 @@ struct perf_open_properties {
u32 sample_flags;
u64 single_context:1;
+ u64 hold_preemption:1;
u64 ctx_handle;
/* OA sampling state */
@@ -2170,6 +2173,8 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
stream->sample_flags |= SAMPLE_OA_REPORT;
stream->sample_size += format_size;
+ stream->hold_preemption = props->hold_preemption;
+
dev_priv->perf.oa.oa_buffer.format_size = format_size;
if (WARN_ON(dev_priv->perf.oa.oa_buffer.format_size == 0))
return -EINVAL;
@@ -2695,6 +2700,15 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
}
}
+ if (props->hold_preemption) {
+ if (!props->single_context) {
+ DRM_DEBUG("preemption disable with no context\n");
+ ret = -EINVAL;
+ goto err;
+ }
+ privileged_op = true;
+ }
+
/*
* On Haswell the OA unit supports clock gating off for a specific
* context and in this mode there's no visibility of metrics for the
@@ -2709,8 +2723,9 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
* MI_REPORT_PERF_COUNT commands and so consider it a privileged op to
* enable the OA unit by default.
*/
- if (IS_HASWELL(dev_priv) && specific_ctx)
+ if (IS_HASWELL(dev_priv) && specific_ctx && !props->hold_preemption) {
privileged_op = false;
+ }
/* Similar to perf's kernel.perf_paranoid_cpu sysctl option
* we check a dev.i915.perf_stream_paranoid sysctl option
@@ -2719,7 +2734,7 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
*/
if (privileged_op &&
i915_perf_stream_paranoid && !capable(CAP_SYS_ADMIN)) {
- DRM_DEBUG("Insufficient privileges to open system-wide i915 perf stream\n");
+ DRM_DEBUG("Insufficient privileges to open i915 perf stream\n");
ret = -EACCES;
goto err_ctx;
}
@@ -2911,6 +2926,9 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
props->oa_periodic = true;
props->oa_period_exponent = value;
break;
+ case DRM_I915_PERF_PROP_HOLD_PREEMPTION:
+ props->hold_preemption = value != 0 ? 1 : 0;
+ break;
case DRM_I915_PERF_PROP_MAX:
MISSING_CASE(id);
return -EINVAL;
@@ -17,6 +17,13 @@ enum {
I915_PRIORITY_NORMAL = I915_CONTEXT_DEFAULT_PRIORITY,
I915_PRIORITY_MAX = I915_CONTEXT_MAX_USER_PRIORITY + 1,
+ /* Requests containing performance queries must not be preempted by
+ * another context. They get scheduled with their default priority and
+ * once they reach the execlist ports we bump them to
+ * I915_PRIORITY_PERF so that they stick to the HW until they finish.
+ */
+ I915_PRIORITY_PERF = I915_CONTEXT_MAX_USER_PRIORITY + 2,
+
I915_PRIORITY_INVALID = INT_MIN
};
@@ -725,6 +725,7 @@ __i915_request_create(struct intel_context *ce, gfp_t gfp)
rq->batch = NULL;
rq->capture_list = NULL;
rq->waitboost = false;
+ rq->has_perf = false;
rq->execution_mask = ALL_ENGINES;
INIT_LIST_HEAD(&rq->active_list);
@@ -216,6 +216,7 @@ struct i915_request {
unsigned long emitted_jiffies;
bool waitboost;
+ bool has_perf;
/** engine->request_list entry for this request */
struct list_head link;
@@ -717,6 +717,12 @@ static void port_assign(struct execlist_port *port, struct i915_request *rq)
{
GEM_BUG_ON(port_isset(port));
+ if (rq->has_perf) {
+ rq->sched.attr.priority =
+ (I915_PRIORITY_MASK & rq->sched.attr.priority) |
+ I915_USER_PRIORITY(I915_PRIORITY_PERF);
+ }
+
port_set(port, i915_request_get(rq));
}
@@ -2001,6 +2001,16 @@ enum drm_i915_perf_property_id {
*/
DRM_I915_PERF_PROP_OA_EXPONENT,
+ /**
+ * Specifying this property is only valid when specify a context to
+ * filter with DRM_I915_PERF_PROP_CTX_HANDLE. Specifying this property
+ * will hold preemption of the particular context we want to gather
+ * performance data about.
+ *
+ * This property is available in perf revision 2.
+ */
+ DRM_I915_PERF_PROP_HOLD_PREEMPTION,
+
DRM_I915_PERF_PROP_MAX /* non-ABI */
};
We would like to make use of perf in Vulkan. The Vulkan API is much lower level than OpenGL, with applications directly exposed to the concept of command buffers (pretty much equivalent to our batch buffers). In Vulkan, queries are always limited in scope to a command buffer. In OpenGL, the lack of command buffer concept meant that queries' duration could span multiple command buffers. With that restriction gone in Vulkan, we would like to simplify measuring performance just by measuring the deltas between the counter snapshots written by 2 MI_RECORD_PERF_COUNT commands, rather than the more complex scheme we currently have in the GL driver, using 2 MI_RECORD_PERF_COUNT commands and doing some post processing on the stream of OA reports, coming from the global OA buffer, to remove any unrelated deltas in between the 2 MI_RECORD_PERF_COUNT. Disabling preemption only apply to a single context with which want to query performance counters for and is considered a privileged operation, by default protected by CAP_SYS_ADMIN. It is possible to enable it for a normal user by disabling the paranoid stream setting. v2: Store preemption setting in intel_context (Chris) v3: Use priorities to avoid preemption rather than the HW mechanism Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> --- .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 8 +++++++ drivers/gpu/drm/i915/gt/intel_lrc.c | 6 +++++ drivers/gpu/drm/i915/i915_drv.c | 2 +- drivers/gpu/drm/i915/i915_drv.h | 8 +++++++ drivers/gpu/drm/i915/i915_perf.c | 22 +++++++++++++++++-- drivers/gpu/drm/i915/i915_priolist_types.h | 7 ++++++ drivers/gpu/drm/i915/i915_request.c | 1 + drivers/gpu/drm/i915/i915_request.h | 1 + drivers/gpu/drm/i915/intel_guc_submission.c | 6 +++++ include/uapi/drm/i915_drm.h | 10 +++++++++ 10 files changed, 68 insertions(+), 3 deletions(-)