[PATCH 0/6] Misc cleanups

[PATCH 0/6] Misc cleanups

[Tvrtko Ursulin]

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

Just some random stuff, mostly execlists and tiny bit of wait request.

Spends a little bit fewer cycles in the hot paths, shrinks the source by a bit,
results with a little bit less .text, and polutes with Gen conditionals at
hot code paths a little bit less.

Tvrtko Ursulin (6):
  drm/i915/bdw+: Replace list_del+list_add_tail with list_move_tail
  drm/i915: Don't need a timer to wake us up
  drm/i915: Avoid invariant conditionals in lrc interrupt handler
  drm/i915: Fail engine initialization if LRCA is incorrectly aligned
  drm/i915: Cache LRCA in the context
  drm/i915: Only grab timestamps when needed

 drivers/gpu/drm/i915/i915_debugfs.c     |  15 ++---
 drivers/gpu/drm/i915/i915_drv.h         |   1 +
 drivers/gpu/drm/i915/i915_gem.c         |  40 +++++--------
 drivers/gpu/drm/i915/intel_lrc.c        | 100 ++++++++++++++++----------------
 drivers/gpu/drm/i915/intel_lrc.h        |   3 +-
 drivers/gpu/drm/i915/intel_ringbuffer.h |   2 +
 6 files changed, 76 insertions(+), 85 deletions(-)

-- 
1.9.1

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[PATCH 1/6] drm/i915/bdw+: Replace list_del+list_add_tail with list_move_tail

[Tvrtko Ursulin]

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

Same effect for slightly less source code and resulting binary.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 23839ff04e27..8b6071fcd743 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -431,9 +431,8 @@ static void execlists_context_unqueue(struct intel_engine_cs *ring)
 			/* Same ctx: ignore first request, as second request
 			 * will update tail past first request's workload */
 			cursor->elsp_submitted = req0->elsp_submitted;
-			list_del(&req0->execlist_link);
-			list_add_tail(&req0->execlist_link,
-				&ring->execlist_retired_req_list);
+			list_move_tail(&req0->execlist_link,
+				       &ring->execlist_retired_req_list);
 			req0 = cursor;
 		} else {
 			req1 = cursor;
@@ -485,9 +484,8 @@ static bool execlists_check_remove_request(struct intel_engine_cs *ring,
 			     "Never submitted head request\n");
 
 			if (--head_req->elsp_submitted <= 0) {
-				list_del(&head_req->execlist_link);
-				list_add_tail(&head_req->execlist_link,
-					&ring->execlist_retired_req_list);
+				list_move_tail(&head_req->execlist_link,
+					       &ring->execlist_retired_req_list);
 				return true;
 			}
 		}
@@ -608,9 +606,8 @@ static int execlists_context_queue(struct drm_i915_gem_request *request)
 		if (request->ctx == tail_req->ctx) {
 			WARN(tail_req->elsp_submitted != 0,
 				"More than 2 already-submitted reqs queued\n");
-			list_del(&tail_req->execlist_link);
-			list_add_tail(&tail_req->execlist_link,
-				&ring->execlist_retired_req_list);
+			list_move_tail(&tail_req->execlist_link,
+				       &ring->execlist_retired_req_list);
 		}
 	}
 
-- 
1.9.1

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Re: [PATCH 1/6] drm/i915/bdw+: Replace list_del+list_add_tail with list_move_tail

[Chris Wilson]

On Thu, Jan 07, 2016 at 04:36:16PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> Same effect for slightly less source code and resulting binary.

How about last year's patch that removed 200 lines from this very code
in lrc?
-Chris

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Re: [PATCH 1/6] drm/i915/bdw+: Replace list_del+list_add_tail with list_move_tail

[Tvrtko Ursulin]

On 07/01/16 16:45, Chris Wilson wrote:
> On Thu, Jan 07, 2016 at 04:36:16PM +0000, Tvrtko Ursulin wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>
>> Same effect for slightly less source code and resulting binary.
>
> How about last year's patch that removed 200 lines from this very code
> in lrc?

If it is small enough for easy quick review you can rebase and resend?

Although I have other things from you to review first.

Regards,

Tvrtko
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[PATCH 2/6] drm/i915: Don't need a timer to wake us up

[Tvrtko Ursulin]

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

Looks like the sleeping loop in __i915_wait_request can be
simplified by using io_schedule_timeout instead of setting
up and destroying a timer.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c | 28 ++++++++--------------------
 1 file changed, 8 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6c60e04fc09c..de98dc41fb9f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1135,11 +1135,6 @@ i915_gem_check_wedge(struct i915_gpu_error *error,
 	return 0;
 }
 
-static void fake_irq(unsigned long data)
-{
-	wake_up_process((struct task_struct *)data);
-}
-
 static bool missed_irq(struct drm_i915_private *dev_priv,
 		       struct intel_engine_cs *ring)
 {
@@ -1291,7 +1286,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 	}
 
 	for (;;) {
-		struct timer_list timer;
+		long sched_timeout;
 
 		prepare_to_wait(&ring->irq_queue, &wait, state);
 
@@ -1321,21 +1316,14 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 			break;
 		}
 
-		timer.function = NULL;
-		if (timeout || missed_irq(dev_priv, ring)) {
-			unsigned long expire;
-
-			setup_timer_on_stack(&timer, fake_irq, (unsigned long)current);
-			expire = missed_irq(dev_priv, ring) ? jiffies + 1 : timeout_expire;
-			mod_timer(&timer, expire);
-		}
-
-		io_schedule();
+		if (timeout)
+			sched_timeout = timeout_expire - jiffies;
+		else if (missed_irq(dev_priv, ring))
+			sched_timeout = 1;
+		else
+			sched_timeout = MAX_SCHEDULE_TIMEOUT;
 
-		if (timer.function) {
-			del_singleshot_timer_sync(&timer);
-			destroy_timer_on_stack(&timer);
-		}
+		io_schedule_timeout(sched_timeout);
 	}
 	if (!irq_test_in_progress)
 		ring->irq_put(ring);
-- 
1.9.1

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[PATCH 3/6] drm/i915: Avoid invariant conditionals in lrc interrupt handler

[Tvrtko Ursulin]

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

There is no need to check on what Gen we are running on every
interrupt and every command submission. We can instead set up
some of that when engines are initialized, store it in the
engine structure and use it directly at runtime.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c        | 36 ++++++++++++++++++---------------
 drivers/gpu/drm/i915/intel_ringbuffer.h |  2 ++
 2 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 8b6071fcd743..84977a6e6f3f 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -298,29 +298,15 @@ uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
 				     struct intel_engine_cs *ring)
 {
 	struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
-	uint64_t desc;
+	uint64_t desc = ring->ctx_desc_template;
 	uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj) +
 			LRC_PPHWSP_PN * PAGE_SIZE;
 
 	WARN_ON(lrca & 0xFFFFFFFF00000FFFULL);
 
-	desc = GEN8_CTX_VALID;
-	desc |= GEN8_CTX_ADDRESSING_MODE(dev) << GEN8_CTX_ADDRESSING_MODE_SHIFT;
-	if (IS_GEN8(ctx_obj->base.dev))
-		desc |= GEN8_CTX_L3LLC_COHERENT;
-	desc |= GEN8_CTX_PRIVILEGE;
 	desc |= lrca;
 	desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT;
 
-	/* TODO: WaDisableLiteRestore when we start using semaphore
-	 * signalling between Command Streamers */
-	/* desc |= GEN8_CTX_FORCE_RESTORE; */
-
-	/* WaEnableForceRestoreInCtxtDescForVCS:skl */
-	/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
-	if (disable_lite_restore_wa(ring))
-		desc |= GEN8_CTX_FORCE_RESTORE;
-
 	return desc;
 }
 
@@ -556,7 +542,7 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring)
 		}
 	}
 
-	if (disable_lite_restore_wa(ring)) {
+	if (ring->disable_lite_restore_wa) {
 		/* Prevent a ctx to preempt itself */
 		if ((status & GEN8_CTX_STATUS_ACTIVE_IDLE) &&
 		    (submit_contexts != 0))
@@ -1980,6 +1966,24 @@ static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *rin
 		goto error;
 	}
 
+	ring->disable_lite_restore_wa = disable_lite_restore_wa(ring);
+
+	ring->ctx_desc_template = GEN8_CTX_VALID;
+	ring->ctx_desc_template |= GEN8_CTX_ADDRESSING_MODE(dev) <<
+				   GEN8_CTX_ADDRESSING_MODE_SHIFT;
+	if (IS_GEN8(dev))
+		ring->ctx_desc_template |= GEN8_CTX_L3LLC_COHERENT;
+	ring->ctx_desc_template |= GEN8_CTX_PRIVILEGE;
+
+	/* TODO: WaDisableLiteRestore when we start using semaphore
+	 * signalling between Command Streamers */
+	/* ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE; */
+
+	/* WaEnableForceRestoreInCtxtDescForVCS:skl */
+	/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
+	if (ring->disable_lite_restore_wa)
+		ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
+
 	return 0;
 
 error:
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 49574ffe54bc..0b91a4b77359 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -268,6 +268,8 @@ struct  intel_engine_cs {
 	struct list_head execlist_queue;
 	struct list_head execlist_retired_req_list;
 	u8 next_context_status_buffer;
+	bool disable_lite_restore_wa;
+	u32 ctx_desc_template;
 	u32             irq_keep_mask; /* bitmask for interrupts that should not be masked */
 	int		(*emit_request)(struct drm_i915_gem_request *request);
 	int		(*emit_flush)(struct drm_i915_gem_request *request,
-- 
1.9.1

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Re: [PATCH 3/6] drm/i915: Avoid invariant conditionals in lrc interrupt handler

[Chris Wilson]

On Thu, Jan 07, 2016 at 04:36:18PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> There is no need to check on what Gen we are running on every
> interrupt and every command submission. We can instead set up
> some of that when engines are initialized, store it in the
> engine structure and use it directly at runtime.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_lrc.c        | 36 ++++++++++++++++++---------------
>  drivers/gpu/drm/i915/intel_ringbuffer.h |  2 ++
>  2 files changed, 22 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index 8b6071fcd743..84977a6e6f3f 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -298,29 +298,15 @@ uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
>  				     struct intel_engine_cs *ring)
>  {
>  	struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
> -	uint64_t desc;
> +	uint64_t desc = ring->ctx_desc_template;
>  	uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj) +
>  			LRC_PPHWSP_PN * PAGE_SIZE;
>  
>  	WARN_ON(lrca & 0xFFFFFFFF00000FFFULL);
>  
> -	desc = GEN8_CTX_VALID;
> -	desc |= GEN8_CTX_ADDRESSING_MODE(dev) << GEN8_CTX_ADDRESSING_MODE_SHIFT;
> -	if (IS_GEN8(ctx_obj->base.dev))
> -		desc |= GEN8_CTX_L3LLC_COHERENT;
> -	desc |= GEN8_CTX_PRIVILEGE;
>  	desc |= lrca;
>  	desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT;
>  
> -	/* TODO: WaDisableLiteRestore when we start using semaphore
> -	 * signalling between Command Streamers */
> -	/* desc |= GEN8_CTX_FORCE_RESTORE; */
> -
> -	/* WaEnableForceRestoreInCtxtDescForVCS:skl */
> -	/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
> -	if (disable_lite_restore_wa(ring))
> -		desc |= GEN8_CTX_FORCE_RESTORE;
> -
>  	return desc;
>  }
>  
> @@ -556,7 +542,7 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring)
>  		}
>  	}
>  
> -	if (disable_lite_restore_wa(ring)) {
> +	if (ring->disable_lite_restore_wa) {
>  		/* Prevent a ctx to preempt itself */
>  		if ((status & GEN8_CTX_STATUS_ACTIVE_IDLE) &&
>  		    (submit_contexts != 0))

Didn't it occur to you that this code is garbage?

> @@ -1980,6 +1966,24 @@ static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *rin
>  		goto error;
>  	}
>  
> +	ring->disable_lite_restore_wa = disable_lite_restore_wa(ring);
> +
> +	ring->ctx_desc_template = GEN8_CTX_VALID;
> +	ring->ctx_desc_template |= GEN8_CTX_ADDRESSING_MODE(dev) <<
> +				   GEN8_CTX_ADDRESSING_MODE_SHIFT;
> +	if (IS_GEN8(dev))
> +		ring->ctx_desc_template |= GEN8_CTX_L3LLC_COHERENT;
> +	ring->ctx_desc_template |= GEN8_CTX_PRIVILEGE;
> +
> +	/* TODO: WaDisableLiteRestore when we start using semaphore
> +	 * signalling between Command Streamers */
> +	/* ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE; */
> +
> +	/* WaEnableForceRestoreInCtxtDescForVCS:skl */
> +	/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
> +	if (ring->disable_lite_restore_wa)
> +		ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
> +
>  	return 0;
>  
>  error:
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
> index 49574ffe54bc..0b91a4b77359 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.h
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
> @@ -268,6 +268,8 @@ struct  intel_engine_cs {
>  	struct list_head execlist_queue;
>  	struct list_head execlist_retired_req_list;
>  	u8 next_context_status_buffer;
> +	bool disable_lite_restore_wa;

You don't need that as a separate flag. You know I sent this patch last
year?
-Chris

-- 
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Re: [PATCH 3/6] drm/i915: Avoid invariant conditionals in lrc interrupt handler

[Tvrtko Ursulin]

On 07/01/16 16:42, Chris Wilson wrote:
> On Thu, Jan 07, 2016 at 04:36:18PM +0000, Tvrtko Ursulin wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>
>> There is no need to check on what Gen we are running on every
>> interrupt and every command submission. We can instead set up
>> some of that when engines are initialized, store it in the
>> engine structure and use it directly at runtime.
>>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_lrc.c        | 36 ++++++++++++++++++---------------
>>   drivers/gpu/drm/i915/intel_ringbuffer.h |  2 ++
>>   2 files changed, 22 insertions(+), 16 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
>> index 8b6071fcd743..84977a6e6f3f 100644
>> --- a/drivers/gpu/drm/i915/intel_lrc.c
>> +++ b/drivers/gpu/drm/i915/intel_lrc.c
>> @@ -298,29 +298,15 @@ uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
>>   				     struct intel_engine_cs *ring)
>>   {
>>   	struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
>> -	uint64_t desc;
>> +	uint64_t desc = ring->ctx_desc_template;
>>   	uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj) +
>>   			LRC_PPHWSP_PN * PAGE_SIZE;
>>
>>   	WARN_ON(lrca & 0xFFFFFFFF00000FFFULL);
>>
>> -	desc = GEN8_CTX_VALID;
>> -	desc |= GEN8_CTX_ADDRESSING_MODE(dev) << GEN8_CTX_ADDRESSING_MODE_SHIFT;
>> -	if (IS_GEN8(ctx_obj->base.dev))
>> -		desc |= GEN8_CTX_L3LLC_COHERENT;
>> -	desc |= GEN8_CTX_PRIVILEGE;
>>   	desc |= lrca;
>>   	desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT;
>>
>> -	/* TODO: WaDisableLiteRestore when we start using semaphore
>> -	 * signalling between Command Streamers */
>> -	/* desc |= GEN8_CTX_FORCE_RESTORE; */
>> -
>> -	/* WaEnableForceRestoreInCtxtDescForVCS:skl */
>> -	/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
>> -	if (disable_lite_restore_wa(ring))
>> -		desc |= GEN8_CTX_FORCE_RESTORE;
>> -
>>   	return desc;
>>   }
>>
>> @@ -556,7 +542,7 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring)
>>   		}
>>   	}
>>
>> -	if (disable_lite_restore_wa(ring)) {
>> +	if (ring->disable_lite_restore_wa) {
>>   		/* Prevent a ctx to preempt itself */
>>   		if ((status & GEN8_CTX_STATUS_ACTIVE_IDLE) &&
>>   		    (submit_contexts != 0))
>
> Didn't it occur to you that this code is garbage?

No, my default position is that I don't understand it well enough. If 
you mean that the two if statements here can be merged and have a single 
execlists_context_unqueue call site, sure, but why not do it in simpler 
steps.

>
>> @@ -1980,6 +1966,24 @@ static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *rin
>>   		goto error;
>>   	}
>>
>> +	ring->disable_lite_restore_wa = disable_lite_restore_wa(ring);
>> +
>> +	ring->ctx_desc_template = GEN8_CTX_VALID;
>> +	ring->ctx_desc_template |= GEN8_CTX_ADDRESSING_MODE(dev) <<
>> +				   GEN8_CTX_ADDRESSING_MODE_SHIFT;
>> +	if (IS_GEN8(dev))
>> +		ring->ctx_desc_template |= GEN8_CTX_L3LLC_COHERENT;
>> +	ring->ctx_desc_template |= GEN8_CTX_PRIVILEGE;
>> +
>> +	/* TODO: WaDisableLiteRestore when we start using semaphore
>> +	 * signalling between Command Streamers */
>> +	/* ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE; */
>> +
>> +	/* WaEnableForceRestoreInCtxtDescForVCS:skl */
>> +	/* WaEnableForceRestoreInCtxtDescForVCS:bxt */
>> +	if (ring->disable_lite_restore_wa)
>> +		ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
>> +
>>   	return 0;
>>
>>   error:
>> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
>> index 49574ffe54bc..0b91a4b77359 100644
>> --- a/drivers/gpu/drm/i915/intel_ringbuffer.h
>> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
>> @@ -268,6 +268,8 @@ struct  intel_engine_cs {
>>   	struct list_head execlist_queue;
>>   	struct list_head execlist_retired_req_list;
>>   	u8 next_context_status_buffer;
>> +	bool disable_lite_restore_wa;
>
> You don't need that as a separate flag. You know I sent this patch last
> year?

Nope. :/

Regards,

Tvrtko
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[PATCH 4/6] drm/i915: Fail engine initialization if LRCA is incorrectly aligned

[Tvrtko Ursulin]

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

LRCA can change only when it goes from unpinned to pinned so it
makes sense to check its alignment at that point rather than at
every batch buffer submission.

Furthermore, if we check it at pin time we can actually
gracefuly fail the engine initialization rather than just
spamming the logs at runtime with WARNs.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 84977a6e6f3f..b9d5862c01c9 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -302,8 +302,6 @@ uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
 	uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj) +
 			LRC_PPHWSP_PN * PAGE_SIZE;
 
-	WARN_ON(lrca & 0xFFFFFFFF00000FFFULL);
-
 	desc |= lrca;
 	desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT;
 
@@ -1030,6 +1028,7 @@ static int intel_lr_context_do_pin(struct intel_engine_cs *ring,
 {
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	u64 lrca;
 	int ret = 0;
 
 	WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
@@ -1038,6 +1037,12 @@ static int intel_lr_context_do_pin(struct intel_engine_cs *ring,
 	if (ret)
 		return ret;
 
+	lrca = i915_gem_obj_ggtt_offset(ctx_obj) + LRC_PPHWSP_PN * PAGE_SIZE;
+	if (WARN_ON(lrca & 0xFFFFFFFF00000FFFULL)) {
+		ret = -EINVAL;
+		goto unpin_ctx_obj;
+	}
+
 	ret = intel_pin_and_map_ringbuffer_obj(ring->dev, ringbuf);
 	if (ret)
 		goto unpin_ctx_obj;
-- 
1.9.1

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Re: [PATCH 4/6] drm/i915: Fail engine initialization if LRCA is incorrectly aligned

[Chris Wilson]

On Thu, Jan 07, 2016 at 04:36:19PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> LRCA can change only when it goes from unpinned to pinned so it
> makes sense to check its alignment at that point rather than at
> every batch buffer submission.
> 
> Furthermore, if we check it at pin time we can actually
> gracefuly fail the engine initialization rather than just
> spamming the logs at runtime with WARNs.

It's an impossible condition, so ENODEV. Still this was superseded by
patches last year...
-Chris

-- 
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[PATCH 5/6] drm/i915: Cache LRCA in the context

[Tvrtko Ursulin]

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

LRCA lifetime is well defined so cache it so it can be looked up
cheaply from the interrupt context and at command submission
time.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 15 ++++++--------
 drivers/gpu/drm/i915/i915_drv.h     |  1 +
 drivers/gpu/drm/i915/intel_lrc.c    | 40 ++++++++++++++++---------------------
 drivers/gpu/drm/i915/intel_lrc.h    |  3 ++-
 4 files changed, 26 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 3b05bd189eab..714a45cf8a51 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1976,12 +1976,13 @@ static int i915_context_status(struct seq_file *m, void *unused)
 }
 
 static void i915_dump_lrc_obj(struct seq_file *m,
-			      struct intel_engine_cs *ring,
-			      struct drm_i915_gem_object *ctx_obj)
+			      struct intel_context *ctx,
+			      struct intel_engine_cs *ring)
 {
 	struct page *page;
 	uint32_t *reg_state;
 	int j;
+	struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
 	unsigned long ggtt_offset = 0;
 
 	if (ctx_obj == NULL) {
@@ -1991,7 +1992,7 @@ static void i915_dump_lrc_obj(struct seq_file *m,
 	}
 
 	seq_printf(m, "CONTEXT: %s %u\n", ring->name,
-		   intel_execlists_ctx_id(ctx_obj));
+		   intel_execlists_ctx_id(ctx, ring));
 
 	if (!i915_gem_obj_ggtt_bound(ctx_obj))
 		seq_puts(m, "\tNot bound in GGTT\n");
@@ -2040,8 +2041,7 @@ static int i915_dump_lrc(struct seq_file *m, void *unused)
 	list_for_each_entry(ctx, &dev_priv->context_list, link) {
 		for_each_ring(ring, dev_priv, i) {
 			if (ring->default_context != ctx)
-				i915_dump_lrc_obj(m, ring,
-						  ctx->engine[i].state);
+				i915_dump_lrc_obj(m, ctx, ring);
 		}
 	}
 
@@ -2115,11 +2115,8 @@ static int i915_execlists(struct seq_file *m, void *data)
 
 		seq_printf(m, "\t%d requests in queue\n", count);
 		if (head_req) {
-			struct drm_i915_gem_object *ctx_obj;
-
-			ctx_obj = head_req->ctx->engine[ring_id].state;
 			seq_printf(m, "\tHead request id: %u\n",
-				   intel_execlists_ctx_id(ctx_obj));
+				   intel_execlists_ctx_id(head_req->ctx, ring));
 			seq_printf(m, "\tHead request tail: %u\n",
 				   head_req->tail);
 		}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8cf655c6fc03..b77a5d84eac2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -881,6 +881,7 @@ struct intel_context {
 		struct drm_i915_gem_object *state;
 		struct intel_ringbuffer *ringbuf;
 		int pin_count;
+		u32 lrca;
 	} engine[I915_NUM_RINGS];
 
 	struct list_head link;
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index b9d5862c01c9..c61da46e0472 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -265,7 +265,8 @@ int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists
 
 /**
  * intel_execlists_ctx_id() - get the Execlists Context ID
- * @ctx_obj: Logical Ring Context backing object.
+ * @ctx: Context to get the ID for
+ * @ring: Engine to get the ID for
  *
  * Do not confuse with ctx->id! Unfortunately we have a name overload
  * here: the old context ID we pass to userspace as a handler so that
@@ -275,14 +276,12 @@ int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists
  *
  * Return: 20-bits globally unique context ID.
  */
-u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj)
+u32 intel_execlists_ctx_id(struct intel_context *ctx,
+			   struct intel_engine_cs *ring)
 {
-	u32 lrca = i915_gem_obj_ggtt_offset(ctx_obj) +
-			LRC_PPHWSP_PN * PAGE_SIZE;
-
 	/* LRCA is required to be 4K aligned so the more significant 20 bits
 	 * are globally unique */
-	return lrca >> 12;
+	return ctx->engine[ring->id].lrca >> 12;
 }
 
 static bool disable_lite_restore_wa(struct intel_engine_cs *ring)
@@ -297,13 +296,11 @@ static bool disable_lite_restore_wa(struct intel_engine_cs *ring)
 uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
 				     struct intel_engine_cs *ring)
 {
-	struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
+	uint64_t lrca = ctx->engine[ring->id].lrca;
 	uint64_t desc = ring->ctx_desc_template;
-	uint64_t lrca = i915_gem_obj_ggtt_offset(ctx_obj) +
-			LRC_PPHWSP_PN * PAGE_SIZE;
 
 	desc |= lrca;
-	desc |= (u64)intel_execlists_ctx_id(ctx_obj) << GEN8_CTX_ID_SHIFT;
+	desc |= (u64)intel_execlists_ctx_id(ctx, ring) << GEN8_CTX_ID_SHIFT;
 
 	return desc;
 }
@@ -461,9 +458,7 @@ static bool execlists_check_remove_request(struct intel_engine_cs *ring,
 					    execlist_link);
 
 	if (head_req != NULL) {
-		struct drm_i915_gem_object *ctx_obj =
-				head_req->ctx->engine[ring->id].state;
-		if (intel_execlists_ctx_id(ctx_obj) == request_id) {
+		if (intel_execlists_ctx_id(head_req->ctx, ring) == request_id) {
 			WARN(head_req->elsp_submitted == 0,
 			     "Never submitted head request\n");
 
@@ -1023,15 +1018,17 @@ int logical_ring_flush_all_caches(struct drm_i915_gem_request *req)
 }
 
 static int intel_lr_context_do_pin(struct intel_engine_cs *ring,
-		struct drm_i915_gem_object *ctx_obj,
-		struct intel_ringbuffer *ringbuf)
+				   struct intel_context *ctx)
 {
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
+	struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
 	u64 lrca;
-	int ret = 0;
+	int ret;
 
 	WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
+
 	ret = i915_gem_obj_ggtt_pin(ctx_obj, GEN8_LR_CONTEXT_ALIGN,
 			PIN_OFFSET_BIAS | GUC_WOPCM_TOP);
 	if (ret)
@@ -1047,6 +1044,7 @@ static int intel_lr_context_do_pin(struct intel_engine_cs *ring,
 	if (ret)
 		goto unpin_ctx_obj;
 
+	ctx->engine[ring->id].lrca = lrca;
 	ctx_obj->dirty = true;
 
 	/* Invalidate GuC TLB. */
@@ -1065,11 +1063,9 @@ static int intel_lr_context_pin(struct drm_i915_gem_request *rq)
 {
 	int ret = 0;
 	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;
 
 	if (rq->ctx->engine[ring->id].pin_count++ == 0) {
-		ret = intel_lr_context_do_pin(ring, ctx_obj, ringbuf);
+		ret = intel_lr_context_do_pin(ring, rq->ctx);
 		if (ret)
 			goto reset_pin_count;
 	}
@@ -1091,6 +1087,7 @@ void intel_lr_context_unpin(struct drm_i915_gem_request *rq)
 		if (--rq->ctx->engine[ring->id].pin_count == 0) {
 			intel_unpin_ringbuffer_obj(ringbuf);
 			i915_gem_object_ggtt_unpin(ctx_obj);
+			rq->ctx->engine[ring->id].lrca = 0;
 		}
 	}
 }
@@ -1960,10 +1957,7 @@ static int logical_ring_init(struct drm_device *dev, struct intel_engine_cs *rin
 		goto error;
 
 	/* As this is the default context, always pin it */
-	ret = intel_lr_context_do_pin(
-			ring,
-			ring->default_context->engine[ring->id].state,
-			ring->default_context->engine[ring->id].ringbuf);
+	ret = intel_lr_context_do_pin(ring, ring->default_context);
 	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 de41ad6cd63d..f9db5f187d77 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -106,6 +106,8 @@ void intel_lr_context_reset(struct drm_device *dev,
 			struct intel_context *ctx);
 uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
 				     struct intel_engine_cs *ring);
+u32 intel_execlists_ctx_id(struct intel_context *ctx,
+			   struct intel_engine_cs *ring);
 
 /* Execlists */
 int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists);
@@ -113,7 +115,6 @@ struct i915_execbuffer_params;
 int intel_execlists_submission(struct i915_execbuffer_params *params,
 			       struct drm_i915_gem_execbuffer2 *args,
 			       struct list_head *vmas);
-u32 intel_execlists_ctx_id(struct drm_i915_gem_object *ctx_obj);
 
 void intel_lrc_irq_handler(struct intel_engine_cs *ring);
 void intel_execlists_retire_requests(struct intel_engine_cs *ring);
-- 
1.9.1

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Re: [PATCH 5/6] drm/i915: Cache LRCA in the context

[Chris Wilson]

On Thu, Jan 07, 2016 at 04:36:20PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> LRCA lifetime is well defined so cache it so it can be looked up
> cheaply from the interrupt context and at command submission
> time.

Or track the actual vma.
-Chris

-- 
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Re: [PATCH 5/6] drm/i915: Cache LRCA in the context

[Tvrtko Ursulin]

On 07/01/16 16:46, Chris Wilson wrote:
> On Thu, Jan 07, 2016 at 04:36:20PM +0000, Tvrtko Ursulin wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>
>> LRCA lifetime is well defined so cache it so it can be looked up
>> cheaply from the interrupt context and at command submission
>> time.
>
> Or track the actual vma.

This looked easier and good enough.

Regards,

Tvrtko
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[PATCH 6/6] drm/i915: Only grab timestamps when needed

[Tvrtko Ursulin]

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

No need to call ktime_get_raw_ns twice per unlimited wait and can
also elimate a local variable.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index de98dc41fb9f..c4f69579eb7a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1246,7 +1246,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 	int state = interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE;
 	DEFINE_WAIT(wait);
 	unsigned long timeout_expire;
-	s64 before, now;
+	s64 before = 0;
 	int ret;
 
 	WARN(!intel_irqs_enabled(dev_priv), "IRQs disabled");
@@ -1266,14 +1266,17 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 			return -ETIME;
 
 		timeout_expire = jiffies + nsecs_to_jiffies_timeout(*timeout);
+
+		/*
+		 * Record current time in case interrupted by signal, or wedged.
+		 */
+		before = ktime_get_raw_ns();
 	}
 
 	if (INTEL_INFO(dev_priv)->gen >= 6)
 		gen6_rps_boost(dev_priv, rps, req->emitted_jiffies);
 
-	/* Record current time in case interrupted by signal, or wedged */
 	trace_i915_gem_request_wait_begin(req);
-	before = ktime_get_raw_ns();
 
 	/* Optimistic spin for the next jiffie before touching IRQs */
 	ret = __i915_spin_request(req, state);
@@ -1331,11 +1334,10 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 	finish_wait(&ring->irq_queue, &wait);
 
 out:
-	now = ktime_get_raw_ns();
 	trace_i915_gem_request_wait_end(req);
 
 	if (timeout) {
-		s64 tres = *timeout - (now - before);
+		s64 tres = *timeout - (ktime_get_raw_ns() - before);
 
 		*timeout = tres < 0 ? 0 : tres;
 
-- 
1.9.1

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Re: [PATCH 6/6] drm/i915: Only grab timestamps when needed

[Chris Wilson]

On Thu, Jan 07, 2016 at 04:36:21PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> 
> No need to call ktime_get_raw_ns twice per unlimited wait and can
> also elimate a local variable.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index de98dc41fb9f..c4f69579eb7a 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1246,7 +1246,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
>  	int state = interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE;
>  	DEFINE_WAIT(wait);
>  	unsigned long timeout_expire;
> -	s64 before, now;
> +	s64 before = 0;

I prefer my version. ;)
-Chris

-- 
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Re: [PATCH 6/6] drm/i915: Only grab timestamps when needed

[Tvrtko Ursulin]

On 07/01/16 16:47, Chris Wilson wrote:
> On Thu, Jan 07, 2016 at 04:36:21PM +0000, Tvrtko Ursulin wrote:
>> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>>
>> No need to call ktime_get_raw_ns twice per unlimited wait and can
>> also elimate a local variable.
>>
>> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
>> ---
>>   drivers/gpu/drm/i915/i915_gem.c | 12 +++++++-----
>>   1 file changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
>> index de98dc41fb9f..c4f69579eb7a 100644
>> --- a/drivers/gpu/drm/i915/i915_gem.c
>> +++ b/drivers/gpu/drm/i915/i915_gem.c
>> @@ -1246,7 +1246,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
>>   	int state = interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE;
>>   	DEFINE_WAIT(wait);
>>   	unsigned long timeout_expire;
>> -	s64 before, now;
>> +	s64 before = 0;
>
> I prefer my version. ;)

Advantage of this one is it can be reviewed and merged in a minute for 
immediate, even if imperceptible, gain. :I

Regards,

Tvrtko
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✓ success: Fi.CI.BAT

[Patchwork]

== Summary ==

Built on ff88655b3a5467bbc3be8c67d3e05ebf182557d3 drm-intel-nightly: 2016y-01m-11d-07h-30m-16s UTC integration manifest

Test kms_pipe_crc_basic:
        Subgroup read-crc-pipe-b:
                dmesg-warn -> PASS       (byt-nuc)

bdw-ultra        total:138  pass:130  dwarn:1   dfail:0   fail:1   skip:6  
bsw-nuc-2        total:141  pass:114  dwarn:3   dfail:0   fail:0   skip:24 
byt-nuc          total:141  pass:119  dwarn:7   dfail:0   fail:0   skip:15 
hsw-brixbox      total:141  pass:134  dwarn:0   dfail:0   fail:0   skip:7  
hsw-gt2          total:141  pass:137  dwarn:0   dfail:0   fail:0   skip:4  
ilk-hp8440p      total:141  pass:100  dwarn:4   dfail:0   fail:0   skip:37 
skl-i5k-2        total:141  pass:132  dwarn:1   dfail:0   fail:0   skip:8  
skl-i7k-2        total:141  pass:131  dwarn:2   dfail:0   fail:0   skip:8  
snb-dellxps      total:141  pass:122  dwarn:5   dfail:0   fail:0   skip:14 
snb-x220t        total:141  pass:122  dwarn:5   dfail:0   fail:1   skip:13 

Results at /archive/results/CI_IGT_test/Patchwork_1113/

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