[PATCH 07/15] drm/i915: Add support for having pid output with OA report

From: sourab.gupta@intel.com
To: intel-gfx@lists.freedesktop.org
Cc: "Christopher S . Hall" <christopher.s.hall@intel.com>,
	Daniel Vetter <daniel.vetter@ffwll.ch>,
	Sourab Gupta <sourab.gupta@intel.com>,
	Matthew Auld <matthew.auld@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 07/15] drm/i915: Add support for having pid output with OA report
Date: Fri,  4 Nov 2016 15:00:36 +0530	[thread overview]
Message-ID: <1478251844-23509-8-git-send-email-sourab.gupta@intel.com> (raw)
In-Reply-To: <1478251844-23509-1-git-send-email-sourab.gupta@intel.com>

From: Sourab Gupta <sourab.gupta@intel.com>

This patch introduces flags and adds support for having pid output with
the OA reports generated through the RCS commands.

When the stream is opened with pid sample type, the pid information is also
captured through the command stream samples and forwarded along with the
OA reports.

Signed-off-by: Sourab Gupta <sourab.gupta@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h  |  2 ++
 drivers/gpu/drm/i915/i915_perf.c | 48 +++++++++++++++++++++++++++++++++++++++-
 include/uapi/drm/i915_drm.h      |  7 ++++++
 3 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 853cc7db..f250e7b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1872,6 +1872,7 @@ struct i915_perf_cs_data_node {
 	struct drm_i915_gem_request *request;
 	u32 offset;
 	u32 ctx_id;
+	u32 pid;
 };
 
 struct drm_i915_private {
@@ -2242,6 +2243,7 @@ struct drm_i915_private {
 		} command_stream_buf;
 
 		u32 last_ctx_id;
+		u32 last_pid;
 		struct list_head node_list;
 		spinlock_t node_list_lock;
 	} perf;
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 84457f8..894d7a6 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -254,6 +254,7 @@ static u32 i915_perf_stream_paranoid = true;
 struct oa_sample_data {
 	u32 source;
 	u32 ctx_id;
+	u32 pid;
 	const u8 *report;
 };
 
@@ -309,6 +310,7 @@ static const enum intel_engine_id user_ring_map[I915_USER_RINGS + 1] = {
 #define SAMPLE_OA_REPORT	(1<<0)
 #define SAMPLE_OA_SOURCE_INFO	(1<<1)
 #define SAMPLE_CTX_ID		(1<<2)
+#define SAMPLE_PID		(1<<3)
 
 struct perf_open_properties {
 	u32 sample_flags;
@@ -484,6 +486,7 @@ static void i915_perf_command_stream_hook_oa(struct drm_i915_gem_request *req)
 		goto out;
 
 	entry->ctx_id = ctx->hw_id;
+	entry->pid = current->pid;
 	i915_gem_request_assign(&entry->request, req);
 
 	addr = dev_priv->perf.command_stream_buf.vma->node.start +
@@ -735,6 +738,12 @@ static int append_oa_sample(struct i915_perf_stream *stream,
 		buf += 4;
 	}
 
+	if (sample_flags & SAMPLE_PID) {
+		if (copy_to_user(buf, &data->pid, 4))
+			return -EFAULT;
+		buf += 4;
+	}
+
 	if (sample_flags & SAMPLE_OA_REPORT) {
 		if (copy_to_user(buf, data->report, report_size))
 			return -EFAULT;
@@ -777,6 +786,9 @@ static int append_oa_buffer_sample(struct i915_perf_stream *stream,
 		data.ctx_id = dev_priv->perf.oa.ops.oa_buffer_get_ctx_id(
 						stream, report);
 
+	if (sample_flags & SAMPLE_PID)
+		data.pid = dev_priv->perf.last_pid;
+
 	if (sample_flags & SAMPLE_OA_REPORT)
 		data.report = report;
 
@@ -1293,6 +1305,11 @@ static int append_oa_rcs_sample(struct i915_perf_stream *stream,
 		dev_priv->perf.last_ctx_id = node->ctx_id;
 	}
 
+	if (sample_flags & SAMPLE_PID) {
+		data.pid = node->pid;
+		dev_priv->perf.last_pid = node->pid;
+	}
+
 	if (sample_flags & SAMPLE_OA_REPORT)
 		data.report = report;
 
@@ -2127,6 +2144,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 	struct drm_i915_private *dev_priv = stream->dev_priv;
 	bool require_oa_unit = props->sample_flags & (SAMPLE_OA_REPORT |
 						      SAMPLE_OA_SOURCE_INFO);
+	bool require_cs_mode = props->sample_flags & SAMPLE_PID;
 	bool cs_sample_data = props->sample_flags & SAMPLE_OA_REPORT;
 	int ret;
 
@@ -2268,6 +2286,20 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 	if (props->sample_flags & SAMPLE_CTX_ID) {
 		stream->sample_flags |= SAMPLE_CTX_ID;
 		stream->sample_size += 4;
+
+		/*
+		 * NB: it's meaningful to request SAMPLE_CTX_ID with just CS
+		 * mode or periodic OA mode sampling but we don't allow
+		 * SAMPLE_CTX_ID without either mode
+		 */
+		if (!require_oa_unit)
+			require_cs_mode = true;
+	}
+
+	if (require_cs_mode && !props->cs_mode) {
+		DRM_ERROR("PID sampling requires a ring to be specified");
+		ret = -EINVAL;
+		goto cs_error;
 	}
 
 	if (props->cs_mode) {
@@ -2278,7 +2310,13 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 			goto cs_error;
 		}
 
-		if (!(props->sample_flags & SAMPLE_CTX_ID)) {
+		/*
+		 * The only time we should allow enabling CS mode if it's not
+		 * strictly required, is if SAMPLE_CTX_ID has been requested
+		 * as it's usable with periodic OA or CS sampling.
+		 */
+		if (!require_cs_mode &&
+		    !(props->sample_flags & SAMPLE_CTX_ID)) {
 			DRM_ERROR(
 				"Ring given without requesting any CS specific property");
 			ret = -EINVAL;
@@ -2287,6 +2325,11 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 
 		stream->cs_mode = true;
 
+		if (props->sample_flags & SAMPLE_PID) {
+			stream->sample_flags |= SAMPLE_PID;
+			stream->sample_size += 4;
+		}
+
 		ret = alloc_command_stream_buf(dev_priv);
 		if (ret)
 			goto cs_error;
@@ -2959,6 +3002,9 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
 		case DRM_I915_PERF_PROP_SAMPLE_CTX_ID:
 			props->sample_flags |= SAMPLE_CTX_ID;
 			break;
+		case DRM_I915_PERF_PROP_SAMPLE_PID:
+			props->sample_flags |= SAMPLE_PID;
+			break;
 		case DRM_I915_PERF_PROP_MAX:
 			BUG();
 		}
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 8baf38a..ead97b7f4 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1307,6 +1307,12 @@ enum drm_i915_perf_property_id {
 	 */
 	DRM_I915_PERF_PROP_SAMPLE_CTX_ID,
 
+	/**
+	 * The value of this property set to 1 requests inclusion of pid in the
+	 * perf sample data.
+	 */
+	DRM_I915_PERF_PROP_SAMPLE_PID,
+
 	DRM_I915_PERF_PROP_MAX /* non-ABI */
 };
 
@@ -1373,6 +1379,7 @@ enum drm_i915_perf_record_type {
 	 *
 	 *     { u32 source_info; } && DRM_I915_PERF_PROP_SAMPLE_OA_SOURCE
 	 *     { u32 ctx_id; } && DRM_I915_PERF_PROP_SAMPLE_CTX_ID
+	 *     { u32 pid; } && DRM_I915_PERF_PROP_SAMPLE_PID
 	 *     { u32 oa_report[]; } && DRM_I915_PERF_PROP_SAMPLE_OA
 	 * };
 	 */
-- 
1.9.1

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