[PATCH 1/4] drm/i915: Make LRC (un)pinning work on context and engine

[PATCH 1/4] drm/i915: Make LRC (un)pinning work on context and engine

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Previously intel_lr_context_(un)pin were operating on requests
which is in conflict with their names.

If we make them take a context and an engine, it makes the names
make more sense and it also makes future fixes possible.

v2: Rebase for default_context/kernel_context change.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Nick Hoath <nicholas.hoath@intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c  |  2 +-
 drivers/gpu/drm/i915/intel_lrc.c | 49 ++++++++++++++++++++--------------------
 drivers/gpu/drm/i915/intel_lrc.h |  3 ++-
 3 files changed, 28 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index c1bb6a61745c..a928823507c5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2680,7 +2680,7 @@ void i915_gem_request_free(struct kref *req_ref)
 
 	if (ctx) {
 		if (i915.enable_execlists && ctx != req->i915->kernel_context)
-			intel_lr_context_unpin(req);
+			intel_lr_context_unpin(ctx, req->ring);
 
 		i915_gem_context_unreference(ctx);
 	}
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index da97bc5666b5..6c95aa19cc90 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -225,7 +225,8 @@ enum {
 #define GEN8_CTX_ID_SHIFT 32
 #define CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT  0x17
 
-static int intel_lr_context_pin(struct drm_i915_gem_request *rq);
+static int intel_lr_context_pin(struct intel_context *ctx,
+				struct intel_engine_cs *engine);
 static void lrc_setup_hardware_status_page(struct intel_engine_cs *ring,
 		struct drm_i915_gem_object *default_ctx_obj);
 
@@ -598,7 +599,7 @@ static int execlists_context_queue(struct drm_i915_gem_request *request)
 	int num_elements = 0;
 
 	if (request->ctx != request->i915->kernel_context)
-		intel_lr_context_pin(request);
+		intel_lr_context_pin(request->ctx, ring);
 
 	i915_gem_request_reference(request);
 
@@ -703,7 +704,7 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
 	}
 
 	if (request->ctx != request->i915->kernel_context)
-		ret = intel_lr_context_pin(request);
+		ret = intel_lr_context_pin(request->ctx, request->ring);
 
 	return ret;
 }
@@ -1014,7 +1015,8 @@ void intel_execlists_retire_requests(struct intel_engine_cs *ring)
 				ctx->engine[ring->id].state;
 
 		if (ctx_obj && (ctx != req->i915->kernel_context))
-			intel_lr_context_unpin(req);
+			intel_lr_context_unpin(ctx, ring);
+
 		list_del(&req->execlist_link);
 		i915_gem_request_unreference(req);
 	}
@@ -1058,8 +1060,8 @@ int logical_ring_flush_all_caches(struct drm_i915_gem_request *req)
 	return 0;
 }
 
-static int intel_lr_context_do_pin(struct intel_engine_cs *ring,
-				   struct intel_context *ctx)
+static int intel_lr_context_do_pin(struct intel_context *ctx,
+				   struct intel_engine_cs *ring)
 {
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -1105,41 +1107,40 @@ unpin_ctx_obj:
 	return ret;
 }
 
-static int intel_lr_context_pin(struct drm_i915_gem_request *rq)
+static int intel_lr_context_pin(struct intel_context *ctx,
+				struct intel_engine_cs *engine)
 {
 	int ret = 0;
-	struct intel_engine_cs *ring = rq->ring;
 
-	if (rq->ctx->engine[ring->id].pin_count++ == 0) {
-		ret = intel_lr_context_do_pin(ring, rq->ctx);
+	if (ctx->engine[engine->id].pin_count++ == 0) {
+		ret = intel_lr_context_do_pin(ctx, engine);
 		if (ret)
 			goto reset_pin_count;
 	}
 	return ret;
 
 reset_pin_count:
-	rq->ctx->engine[ring->id].pin_count = 0;
+	ctx->engine[engine->id].pin_count = 0;
 	return ret;
 }
 
-void intel_lr_context_unpin(struct drm_i915_gem_request *rq)
+void intel_lr_context_unpin(struct intel_context *ctx,
+			    struct intel_engine_cs *engine)
 {
-	struct intel_engine_cs *ring = rq->ring;
-	struct drm_i915_gem_object *ctx_obj = rq->ctx->engine[ring->id].state;
-	struct intel_ringbuffer *ringbuf = rq->ringbuf;
+	struct drm_i915_gem_object *ctx_obj = ctx->engine[engine->id].state;
 
-	WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
+	WARN_ON(!mutex_is_locked(&engine->dev->struct_mutex));
 
-	if (!ctx_obj)
+	if (WARN_ON_ONCE(!ctx_obj))
 		return;
 
-	if (--rq->ctx->engine[ring->id].pin_count == 0) {
-		kunmap(kmap_to_page(rq->ctx->engine[ring->id].lrc_reg_state));
-		intel_unpin_ringbuffer_obj(ringbuf);
+	if (--ctx->engine[engine->id].pin_count == 0) {
+		kunmap(kmap_to_page(ctx->engine[engine->id].lrc_reg_state));
+		intel_unpin_ringbuffer_obj(ctx->engine[engine->id].ringbuf);
 		i915_gem_object_ggtt_unpin(ctx_obj);
-		rq->ctx->engine[ring->id].lrc_vma = NULL;
-		rq->ctx->engine[ring->id].lrc_desc = 0;
-		rq->ctx->engine[ring->id].lrc_reg_state = NULL;
+		ctx->engine[engine->id].lrc_vma = NULL;
+		ctx->engine[engine->id].lrc_desc = 0;
+		ctx->engine[engine->id].lrc_reg_state = NULL;
 	}
 }
 
@@ -2064,7 +2065,7 @@ logical_ring_init(struct drm_device *dev, struct intel_engine_cs *ring)
 		goto error;
 
 	/* As this is the default context, always pin it */
-	ret = intel_lr_context_do_pin(ring, dctx);
+	ret = intel_lr_context_do_pin(dctx, ring);
 	if (ret) {
 		DRM_ERROR(
 			"Failed to pin and map ringbuffer %s: %d\n",
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 49af638f6213..e6cda3e225d0 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -101,7 +101,8 @@ void intel_lr_context_free(struct intel_context *ctx);
 uint32_t intel_lr_context_size(struct intel_engine_cs *ring);
 int intel_lr_context_deferred_alloc(struct intel_context *ctx,
 				    struct intel_engine_cs *ring);
-void intel_lr_context_unpin(struct drm_i915_gem_request *req);
+void intel_lr_context_unpin(struct intel_context *ctx,
+			    struct intel_engine_cs *engine);
 void intel_lr_context_reset(struct drm_device *dev,
 			struct intel_context *ctx);
 uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
-- 
1.9.1

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[PATCH 2/4] drm/i915: Make LRC pinning own a reference to the context

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Will simplify the following fix and sounds logical.

v2: Add some whitespace to separate logic better. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Nick Hoath <nicholas.hoath@intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 6c95aa19cc90..61e64d78adbd 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1116,6 +1116,8 @@ static int intel_lr_context_pin(struct intel_context *ctx,
 		ret = intel_lr_context_do_pin(ctx, engine);
 		if (ret)
 			goto reset_pin_count;
+
+		i915_gem_context_reference(ctx);
 	}
 	return ret;
 
@@ -1141,6 +1143,8 @@ void intel_lr_context_unpin(struct intel_context *ctx,
 		ctx->engine[engine->id].lrc_vma = NULL;
 		ctx->engine[engine->id].lrc_desc = 0;
 		ctx->engine[engine->id].lrc_reg_state = NULL;
+
+		i915_gem_context_unreference(ctx);
 	}
 }
 
-- 
1.9.1

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[PATCH 3/4] drm/i915: Extract context unpinning to its own function

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Will enable cleaner implementation of a following fix and
easier code unification in the future.

Idea and code by Chris Wilson.

v2: Do not return before last_contexts on engines are unpinned.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 6a4f64b03db6..bba17b9f1be5 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -321,6 +321,14 @@ err_destroy:
 	return ERR_PTR(ret);
 }
 
+static void i915_gem_context_unpin(struct intel_context *ctx,
+				   struct intel_engine_cs *engine)
+{
+	if (engine->id == RCS && ctx->legacy_hw_ctx.rcs_state)
+		i915_gem_object_ggtt_unpin(ctx->legacy_hw_ctx.rcs_state);
+	i915_gem_context_unreference(ctx);
+}
+
 void i915_gem_context_reset(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -329,22 +337,15 @@ void i915_gem_context_reset(struct drm_device *dev)
 	if (i915.enable_execlists) {
 		struct intel_context *ctx;
 
-		list_for_each_entry(ctx, &dev_priv->context_list, link) {
+		list_for_each_entry(ctx, &dev_priv->context_list, link)
 			intel_lr_context_reset(dev, ctx);
-		}
-
-		return;
 	}
 
 	for (i = 0; i < I915_NUM_RINGS; i++) {
 		struct intel_engine_cs *ring = &dev_priv->ring[i];
-		struct intel_context *lctx = ring->last_context;
-
-		if (lctx) {
-			if (lctx->legacy_hw_ctx.rcs_state && i == RCS)
-				i915_gem_object_ggtt_unpin(lctx->legacy_hw_ctx.rcs_state);
 
-			i915_gem_context_unreference(lctx);
+		if (ring->last_context) {
+			i915_gem_context_unpin(ring->last_context, ring);
 			ring->last_context = NULL;
 		}
 	}
@@ -417,13 +418,6 @@ void i915_gem_context_fini(struct drm_device *dev)
 		 * to offset the do_switch part, so that i915_gem_context_unreference()
 		 * can then free the base object correctly. */
 		WARN_ON(!dev_priv->ring[RCS].last_context);
-		if (dev_priv->ring[RCS].last_context == dctx) {
-			/* Fake switch to NULL context */
-			WARN_ON(dctx->legacy_hw_ctx.rcs_state->active);
-			i915_gem_object_ggtt_unpin(dctx->legacy_hw_ctx.rcs_state);
-			i915_gem_context_unreference(dctx);
-			dev_priv->ring[RCS].last_context = NULL;
-		}
 
 		i915_gem_object_ggtt_unpin(dctx->legacy_hw_ctx.rcs_state);
 	}
@@ -432,7 +426,7 @@ void i915_gem_context_fini(struct drm_device *dev)
 		struct intel_engine_cs *ring = &dev_priv->ring[i];
 
 		if (ring->last_context) {
-			i915_gem_context_unreference(ring->last_context);
+			i915_gem_context_unpin(ring->last_context, ring);
 			ring->last_context = NULL;
 		}
 	}
-- 
1.9.1

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[PATCH 4/4] drm/i915: Fix premature LRC unpin in GuC mode

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

In GuC mode LRC pinning lifetime depends exclusively on the
request liftime. Since that is terminated by the seqno update
that opens up a race condition between GPU finishing writing
out the context image and the driver unpinning the LRC.

To extend the LRC lifetime we will employ a similar approach
to what legacy ringbuffer submission does.

We will start tracking the last submitted context per engine
and keep it pinned until it is replaced by another one.

Note that the driver unload path is a bit fragile and could
benefit greatly from efforts to unify the legacy and exec
list submission code paths.

At the moment i915_gem_context_fini has special casing for the
two which are potentialy not needed, and also depends on
i915_gem_cleanup_ringbuffer running before itself.

v2:
 * Move pinning into engine->emit_request and actually fix
   the reference/unreference logic. (Chris Wilson)

 * ring->dev can be NULL on driver unload so use a different
   route towards it.

v3:
 * Rebase.
 * Handle the reset path. (Chris Wilson)
 * Exclude default context from the pinning - it is impossible
   to get it right before default context special casing in
   general is eliminated.

v4:
 * Rebased & moved context tracking to
   intel_logical_ring_advance_and_submit.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Issue: VIZ-4277
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Nick Hoath <nicholas.hoath@intel.com>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 10 +++++++---
 drivers/gpu/drm/i915/intel_lrc.c        | 16 ++++++++++++++--
 2 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index bba17b9f1be5..83a097c94911 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -324,9 +324,13 @@ err_destroy:
 static void i915_gem_context_unpin(struct intel_context *ctx,
 				   struct intel_engine_cs *engine)
 {
-	if (engine->id == RCS && ctx->legacy_hw_ctx.rcs_state)
-		i915_gem_object_ggtt_unpin(ctx->legacy_hw_ctx.rcs_state);
-	i915_gem_context_unreference(ctx);
+	if (i915.enable_execlists) {
+		intel_lr_context_unpin(ctx, engine);
+	} else {
+		if (engine->id == RCS && ctx->legacy_hw_ctx.rcs_state)
+			i915_gem_object_ggtt_unpin(ctx->legacy_hw_ctx.rcs_state);
+		i915_gem_context_unreference(ctx);
+	}
 }
 
 void i915_gem_context_reset(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 61e64d78adbd..3a03646e343d 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -765,6 +765,7 @@ intel_logical_ring_advance_and_submit(struct drm_i915_gem_request *request)
 {
 	struct intel_ringbuffer *ringbuf = request->ringbuf;
 	struct drm_i915_private *dev_priv = request->i915;
+	struct intel_engine_cs *engine = request->ring;
 
 	intel_logical_ring_advance(ringbuf);
 	request->tail = ringbuf->tail;
@@ -779,9 +780,20 @@ intel_logical_ring_advance_and_submit(struct drm_i915_gem_request *request)
 	intel_logical_ring_emit(ringbuf, MI_NOOP);
 	intel_logical_ring_advance(ringbuf);
 
-	if (intel_ring_stopped(request->ring))
+	if (intel_ring_stopped(engine))
 		return 0;
 
+	if (engine->last_context != request->ctx) {
+		if (engine->last_context)
+			intel_lr_context_unpin(engine->last_context, engine);
+		if (request->ctx != request->i915->kernel_context) {
+			intel_lr_context_pin(request->ctx, engine);
+			engine->last_context = request->ctx;
+		} else {
+			engine->last_context = NULL;
+		}
+	}
+
 	if (dev_priv->guc.execbuf_client)
 		i915_guc_submit(dev_priv->guc.execbuf_client, request);
 	else
@@ -1131,7 +1143,7 @@ void intel_lr_context_unpin(struct intel_context *ctx,
 {
 	struct drm_i915_gem_object *ctx_obj = ctx->engine[engine->id].state;
 
-	WARN_ON(!mutex_is_locked(&engine->dev->struct_mutex));
+	WARN_ON(!mutex_is_locked(&ctx->i915->dev->struct_mutex));
 
 	if (WARN_ON_ONCE(!ctx_obj))
 		return;
-- 
1.9.1

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Re: [PATCH 1/4] drm/i915: Make LRC (un)pinning work on context and engine

[Tvrtko Ursulin]

On 28/01/16 10:29, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>
> Previously intel_lr_context_(un)pin were operating on requests
> which is in conflict with their names.
>
> If we make them take a context and an engine, it makes the names
> make more sense and it also makes future fixes possible.
>
> v2: Rebase for default_context/kernel_context change.

Series re-sent for CI only.

Regards,

Tvrtko
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✗ Fi.CI.BAT: failure for series starting with [1/4] drm/i915: Make LRC (un)pinning work on context and engine

[Patchwork]

== Summary ==

Series 2896v1 Series without cover letter
http://patchwork.freedesktop.org/api/1.0/series/2896/revisions/1/mbox/

Test kms_flip:
        Subgroup basic-flip-vs-modeset:
                pass       -> DMESG-WARN (ilk-hp8440p) UNSTABLE

bdw-nuci7        total:156  pass:147  dwarn:0   dfail:0   fail:0   skip:9  
bdw-ultra        total:159  pass:153  dwarn:0   dfail:0   fail:0   skip:6  
bsw-nuc-2        total:159  pass:135  dwarn:0   dfail:0   fail:0   skip:24 
byt-nuc          total:159  pass:142  dwarn:0   dfail:0   fail:0   skip:17 
hsw-brixbox      total:159  pass:152  dwarn:0   dfail:0   fail:0   skip:7  
hsw-gt2          total:159  pass:155  dwarn:0   dfail:0   fail:0   skip:4  
ilk-hp8440p      total:159  pass:113  dwarn:1   dfail:0   fail:1   skip:44 
ivb-t430s        total:159  pass:151  dwarn:0   dfail:0   fail:0   skip:8  
snb-dellxps      total:159  pass:141  dwarn:0   dfail:0   fail:0   skip:18 
snb-x220t        total:159  pass:141  dwarn:0   dfail:0   fail:1   skip:17 

HANGED skl-i5k-2 in igt@gem_sync@basic-blt

Results at /archive/results/CI_IGT_test/Patchwork_1309/

b3f8ad64bc71f6236f05c2e9f4ad49a61745869a drm-intel-nightly: 2016y-01m-28d-10h-26m-23s UTC integration manifest
b8f13982bcce1baef100ec7f9b18336b9608a2fb drm/i915: Fix premature LRC unpin in GuC mode
5723d041e5492172cc019b8cb288500407160d1d drm/i915: Extract context unpinning to its own function
7659aab9d760aef74f244702c7b51ada6fcfc9dc drm/i915: Make LRC pinning own a reference to the context
171c49d3242038c5831e1cb96a50c77722bac34d drm/i915: Make LRC (un)pinning work on context and engine

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Re: ✗ Fi.CI.BAT: failure for series starting with [1/4] drm/i915: Make LRC (un)pinning work on context and engine

[Tvrtko Ursulin]

On 28/01/16 17:26, Patchwork wrote:
> == Summary ==
>
> Series 2896v1 Series without cover letter
> http://patchwork.freedesktop.org/api/1.0/series/2896/revisions/1/mbox/
>
> Test kms_flip:
>          Subgroup basic-flip-vs-modeset:
>                  pass       -> DMESG-WARN (ilk-hp8440p) UNSTABLE

Known and unrelated issue https://bugs.freedesktop.org/show_bug.cgi?id=93787

Regards,

Tvrtko

> bdw-nuci7        total:156  pass:147  dwarn:0   dfail:0   fail:0   skip:9
> bdw-ultra        total:159  pass:153  dwarn:0   dfail:0   fail:0   skip:6
> bsw-nuc-2        total:159  pass:135  dwarn:0   dfail:0   fail:0   skip:24
> byt-nuc          total:159  pass:142  dwarn:0   dfail:0   fail:0   skip:17
> hsw-brixbox      total:159  pass:152  dwarn:0   dfail:0   fail:0   skip:7
> hsw-gt2          total:159  pass:155  dwarn:0   dfail:0   fail:0   skip:4
> ilk-hp8440p      total:159  pass:113  dwarn:1   dfail:0   fail:1   skip:44
> ivb-t430s        total:159  pass:151  dwarn:0   dfail:0   fail:0   skip:8
> snb-dellxps      total:159  pass:141  dwarn:0   dfail:0   fail:0   skip:18
> snb-x220t        total:159  pass:141  dwarn:0   dfail:0   fail:1   skip:17
>
> HANGED skl-i5k-2 in igt@gem_sync@basic-blt
>
> Results at /archive/results/CI_IGT_test/Patchwork_1309/
>
> b3f8ad64bc71f6236f05c2e9f4ad49a61745869a drm-intel-nightly: 2016y-01m-28d-10h-26m-23s UTC integration manifest
> b8f13982bcce1baef100ec7f9b18336b9608a2fb drm/i915: Fix premature LRC unpin in GuC mode
> 5723d041e5492172cc019b8cb288500407160d1d drm/i915: Extract context unpinning to its own function
> 7659aab9d760aef74f244702c7b51ada6fcfc9dc drm/i915: Make LRC pinning own a reference to the context
> 171c49d3242038c5831e1cb96a50c77722bac34d drm/i915: Make LRC (un)pinning work on context and engine
>
>
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