[PATCH 1/2] drm/i915: intel_ring.engine is unused

[PATCH 1/2] drm/i915: intel_ring.engine is unused

[Chris Wilson]

Or rather it is used only by intel_ring_pin() to extract the
drm_i915_private which we can easily pass in. As this is a relatively
rare operation, save the space in the struct, and as such it is even
break even in the extra code for passing around the parameter:

add/remove: 0/0 grow/shrink: 2/3 up/down: 15/-15 (0)
function                                     old     new   delta
intel_init_ring_buffer                       906     918     +12
execlists_context_pin                       1308    1311      +3
mock_engine                                  407     403      -4
intel_engine_create_ring                     367     363      -4
intel_ring_pin                               326     319      -7
Total: Before=1261794, After=1261794, chg +0.00%

v2: Reorder intel_init_ring_buffer to keep the ring setup together:

add/remove: 0/0 grow/shrink: 2/3 up/down: 9/-15 (-6)
function                                     old     new   delta
intel_init_ring_buffer                       906     912      +6
execlists_context_pin                       1308    1311      +3
mock_engine                                  407     403      -4
intel_engine_create_ring                     367     363      -4
intel_ring_pin                               326     319      -7
Total: Before=1261794, After=1261788, chg -0.00%

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c             |  2 +-
 drivers/gpu/drm/i915/intel_ringbuffer.c      | 28 +++++++++++++---------------
 drivers/gpu/drm/i915/intel_ringbuffer.h      |  6 +++---
 drivers/gpu/drm/i915/selftests/mock_engine.c |  1 -
 4 files changed, 17 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index c8f7c631fc1f..0dc1cc4ad6e7 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -771,7 +771,7 @@ static int execlists_context_pin(struct intel_engine_cs *engine,
 		goto unpin_vma;
 	}
 
-	ret = intel_ring_pin(ce->ring, ctx->ggtt_offset_bias);
+	ret = intel_ring_pin(ce->ring, ctx->i915, ctx->ggtt_offset_bias);
 	if (ret)
 		goto unpin_map;
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 66a2b8b83972..5e7634c00cbd 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1270,17 +1270,18 @@ static int init_phys_status_page(struct intel_engine_cs *engine)
 	return 0;
 }
 
-int intel_ring_pin(struct intel_ring *ring, unsigned int offset_bias)
+int intel_ring_pin(struct intel_ring *ring,
+		   struct drm_i915_private *i915,
+		   unsigned int offset_bias)
 {
-	unsigned int flags;
-	enum i915_map_type map;
+	enum i915_map_type map = HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC;
 	struct i915_vma *vma = ring->vma;
+	unsigned int flags;
 	void *addr;
 	int ret;
 
 	GEM_BUG_ON(ring->vaddr);
 
-	map = HAS_LLC(ring->engine->i915) ? I915_MAP_WB : I915_MAP_WC;
 
 	flags = PIN_GLOBAL;
 	if (offset_bias)
@@ -1369,8 +1370,6 @@ intel_engine_create_ring(struct intel_engine_cs *engine, int size)
 	if (!ring)
 		return ERR_PTR(-ENOMEM);
 
-	ring->engine = engine;
-
 	INIT_LIST_HEAD(&ring->request_list);
 
 	ring->size = size;
@@ -1481,7 +1480,6 @@ static void intel_ring_context_unpin(struct intel_engine_cs *engine,
 
 static int intel_init_ring_buffer(struct intel_engine_cs *engine)
 {
-	struct drm_i915_private *dev_priv = engine->i915;
 	struct intel_ring *ring;
 	int ret;
 
@@ -1493,13 +1491,7 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
 	if (ret)
 		goto error;
 
-	ring = intel_engine_create_ring(engine, 32 * PAGE_SIZE);
-	if (IS_ERR(ring)) {
-		ret = PTR_ERR(ring);
-		goto error;
-	}
-
-	if (HWS_NEEDS_PHYSICAL(dev_priv)) {
+	if (HWS_NEEDS_PHYSICAL(engine->i915)) {
 		WARN_ON(engine->id != RCS);
 		ret = init_phys_status_page(engine);
 		if (ret)
@@ -1510,8 +1502,14 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
 			goto error;
 	}
 
+	ring = intel_engine_create_ring(engine, 32 * PAGE_SIZE);
+	if (IS_ERR(ring)) {
+		ret = PTR_ERR(ring);
+		goto error;
+	}
+
 	/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
-	ret = intel_ring_pin(ring, I915_GTT_PAGE_SIZE);
+	ret = intel_ring_pin(ring, engine->i915, I915_GTT_PAGE_SIZE);
 	if (ret) {
 		intel_ring_free(ring);
 		goto error;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index a82a0807f64d..cbe61d3f31da 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -139,8 +139,6 @@ struct intel_ring {
 	struct i915_vma *vma;
 	void *vaddr;
 
-	struct intel_engine_cs *engine;
-
 	struct list_head request_list;
 
 	u32 head;
@@ -487,7 +485,9 @@ intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
 
 struct intel_ring *
 intel_engine_create_ring(struct intel_engine_cs *engine, int size);
-int intel_ring_pin(struct intel_ring *ring, unsigned int offset_bias);
+int intel_ring_pin(struct intel_ring *ring,
+		   struct drm_i915_private *i915,
+		   unsigned int offset_bias);
 void intel_ring_unpin(struct intel_ring *ring);
 void intel_ring_free(struct intel_ring *ring);
 
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c
index 0ad624a1db90..b89050e0de48 100644
--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -112,7 +112,6 @@ static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
 	if (!ring)
 		return NULL;
 
-	ring->engine = engine;
 	ring->size = sz;
 	ring->effective_size = sz;
 	ring->vaddr = (void *)(ring + 1);
-- 
2.11.0

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[PATCH 2/2] drm/i915: Onion unwind for intel_init_ring_common()

[Chris Wilson]

Rather than call intel_engine_cleanup() with a partially constructed
engine, unwind the error during intel_init_ring_common().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 77 +++++++++++++++------------------
 1 file changed, 36 insertions(+), 41 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5e7634c00cbd..c98acc27279a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1259,6 +1259,8 @@ static int init_phys_status_page(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = engine->i915;
 
+	GEM_BUG_ON(engine->id != RCS);
+
 	dev_priv->status_page_dmah =
 		drm_pci_alloc(&dev_priv->drm, PAGE_SIZE, PAGE_SIZE);
 	if (!dev_priv->status_page_dmah)
@@ -1481,76 +1483,69 @@ static void intel_ring_context_unpin(struct intel_engine_cs *engine,
 static int intel_init_ring_buffer(struct intel_engine_cs *engine)
 {
 	struct intel_ring *ring;
-	int ret;
-
-	WARN_ON(engine->buffer);
+	int err;
 
 	intel_engine_setup_common(engine);
 
-	ret = intel_engine_init_common(engine);
-	if (ret)
-		goto error;
+	err = intel_engine_init_common(engine);
+	if (err)
+		goto err;
 
-	if (HWS_NEEDS_PHYSICAL(engine->i915)) {
-		WARN_ON(engine->id != RCS);
-		ret = init_phys_status_page(engine);
-		if (ret)
-			goto error;
-	} else {
-		ret = init_status_page(engine);
-		if (ret)
-			goto error;
-	}
+	if (HWS_NEEDS_PHYSICAL(engine->i915))
+		err = init_phys_status_page(engine);
+	else
+		err = init_status_page(engine);
+	if (err)
+		goto err;
 
 	ring = intel_engine_create_ring(engine, 32 * PAGE_SIZE);
 	if (IS_ERR(ring)) {
-		ret = PTR_ERR(ring);
-		goto error;
+		err = PTR_ERR(ring);
+		goto err_hws;
 	}
 
 	/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
-	ret = intel_ring_pin(ring, engine->i915, I915_GTT_PAGE_SIZE);
-	if (ret) {
-		intel_ring_free(ring);
-		goto error;
-	}
+	err = intel_ring_pin(ring, engine->i915, I915_GTT_PAGE_SIZE);
+	if (err)
+		goto err_ring;
+
+	GEM_BUG_ON(engine->buffer);
 	engine->buffer = ring;
 
 	return 0;
 
-error:
-	intel_engine_cleanup(engine);
-	return ret;
+err_ring:
+	intel_ring_free(ring);
+err_hws:
+	if (HWS_NEEDS_PHYSICAL(engine->i915))
+		cleanup_phys_status_page(engine);
+	else
+		cleanup_status_page(engine);
+err:
+	intel_engine_cleanup_common(engine);
+	return err;
 }
 
 void intel_engine_cleanup(struct intel_engine_cs *engine)
 {
-	struct drm_i915_private *dev_priv;
-
-	dev_priv = engine->i915;
+	struct drm_i915_private *dev_priv = engine->i915;
 
-	if (engine->buffer) {
-		WARN_ON(INTEL_GEN(dev_priv) > 2 &&
-			(I915_READ_MODE(engine) & MODE_IDLE) == 0);
+	WARN_ON(INTEL_GEN(dev_priv) > 2 &&
+		(I915_READ_MODE(engine) & MODE_IDLE) == 0);
 
-		intel_ring_unpin(engine->buffer);
-		intel_ring_free(engine->buffer);
-		engine->buffer = NULL;
-	}
+	intel_ring_unpin(engine->buffer);
+	intel_ring_free(engine->buffer);
 
 	if (engine->cleanup)
 		engine->cleanup(engine);
 
-	if (HWS_NEEDS_PHYSICAL(dev_priv)) {
-		WARN_ON(engine->id != RCS);
+	if (HWS_NEEDS_PHYSICAL(dev_priv))
 		cleanup_phys_status_page(engine);
-	} else {
+	else
 		cleanup_status_page(engine);
-	}
 
 	intel_engine_cleanup_common(engine);
 
-	engine->i915 = NULL;
 	dev_priv->engine[engine->id] = NULL;
 	kfree(engine);
 }
-- 
2.11.0

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✓ Fi.CI.BAT: success for series starting with [1/2] drm/i915: intel_ring.engine is unused

[Patchwork]

== Series Details ==

Series: series starting with [1/2] drm/i915: intel_ring.engine is unused
URL   : https://patchwork.freedesktop.org/series/22358/
State : success

== Summary ==

Series 22358v1 Series without cover letter
https://patchwork.freedesktop.org/api/1.0/series/22358/revisions/1/mbox/

Test kms_pipe_crc_basic:
        Subgroup suspend-read-crc-pipe-c:
                pass       -> DMESG-WARN (fi-bsw-n3050) fdo#100113

fdo#100113 https://bugs.freedesktop.org/show_bug.cgi?id=100113

fi-bdw-5557u     total:278  pass:267  dwarn:0   dfail:0   fail:0   skip:11  time: 430s
fi-bdw-gvtdvm    total:278  pass:256  dwarn:8   dfail:0   fail:0   skip:14  time: 430s
fi-bsw-n3050     total:278  pass:238  dwarn:1   dfail:0   fail:0   skip:39  time: 571s
fi-bxt-j4205     total:278  pass:259  dwarn:0   dfail:0   fail:0   skip:19  time: 509s
fi-bxt-t5700     total:278  pass:258  dwarn:0   dfail:0   fail:0   skip:20  time: 540s
fi-byt-j1900     total:278  pass:251  dwarn:0   dfail:0   fail:0   skip:27  time: 484s
fi-byt-n2820     total:278  pass:247  dwarn:0   dfail:0   fail:0   skip:31  time: 486s
fi-hsw-4770      total:278  pass:262  dwarn:0   dfail:0   fail:0   skip:16  time: 405s
fi-hsw-4770r     total:278  pass:262  dwarn:0   dfail:0   fail:0   skip:16  time: 407s
fi-ilk-650       total:278  pass:228  dwarn:0   dfail:0   fail:0   skip:50  time: 423s
fi-ivb-3520m     total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 493s
fi-ivb-3770      total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 474s
fi-kbl-7500u     total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18  time: 457s
fi-kbl-7560u     total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10  time: 574s
fi-skl-6260u     total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10  time: 451s
fi-skl-6700hq    total:278  pass:261  dwarn:0   dfail:0   fail:0   skip:17  time: 568s
fi-skl-6700k     total:278  pass:256  dwarn:4   dfail:0   fail:0   skip:18  time: 461s
fi-skl-6770hq    total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10  time: 492s
fi-skl-gvtdvm    total:278  pass:265  dwarn:0   dfail:0   fail:0   skip:13  time: 437s
fi-snb-2520m     total:278  pass:250  dwarn:0   dfail:0   fail:0   skip:28  time: 528s
fi-snb-2600      total:278  pass:249  dwarn:0   dfail:0   fail:0   skip:29  time: 407s

61a93a2f9a2d9a611d673ecd0dfa693f0c888003 drm-tip: 2017y-04m-03d-09h-50m-53s UTC integration manifest
5f8f5aa drm/i915: Onion unwind for intel_init_ring_common()
cc2e8ad drm/i915: intel_ring.engine is unused

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_4383/
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Re: [PATCH 2/2] drm/i915: Onion unwind for intel_init_ring_common()

[Joonas Lahtinen]

On ma, 2017-04-03 at 12:34 +0100, Chris Wilson wrote:
> Rather than call intel_engine_cleanup() with a partially constructed
> engine, unwind the error during intel_init_ring_common().
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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Re: ✓ Fi.CI.BAT: success for series starting with [1/2] drm/i915: intel_ring.engine is unused

[Chris Wilson]

On Mon, Apr 03, 2017 at 11:54:47AM -0000, Patchwork wrote:
> == Series Details ==
> 
> Series: series starting with [1/2] drm/i915: intel_ring.engine is unused
> URL   : https://patchwork.freedesktop.org/series/22358/
> State : success
> 
> == Summary ==
> 
> Series 22358v1 Series without cover letter
> https://patchwork.freedesktop.org/api/1.0/series/22358/revisions/1/mbox/
> 
> Test kms_pipe_crc_basic:
>         Subgroup suspend-read-crc-pipe-c:
>                 pass       -> DMESG-WARN (fi-bsw-n3050) fdo#100113
> 
> fdo#100113 https://bugs.freedesktop.org/show_bug.cgi?id=100113

Pushed the really minor tidy.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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