[PATCH v7 1/6] drm/i915/guc: Avoid wasting memory on incorrect GuC pin bias

[PATCH v7 1/6] drm/i915/guc: Avoid wasting memory on incorrect GuC pin bias

[Jakub Bartmiński]

It would appear that the calculated GuC pin bias was larger than it should
be, as the GuC address space does NOT contain the "HW contexts RSVD" part
of the WOPCM. Thus, the GuC pin bias is simply the GuC WOPCM size.

v5:
Clarify the diagram to better represent the GuC address space.
Since we now don't use guc.base for the pin bias there's no need to
validate it. It also has already been verified in WOPCM init.

Bspec: 1180

Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
---
 drivers/gpu/drm/i915/intel_guc.c | 49 +++++++++++++-------------------
 1 file changed, 20 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index e12bd259df17..aa28368f8ba7 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -582,50 +582,41 @@ int intel_guc_resume(struct intel_guc *guc)
  *
  * ::
  *
- *     +==============> +====================+ <== GUC_GGTT_TOP
- *     ^                |                    |
- *     |                |                    |
- *     |                |        DRAM        |
- *     |                |       Memory       |
- *     |                |                    |
- *    GuC               |                    |
- *  Address  +========> +====================+ <== WOPCM Top
- *   Space   ^          |   HW contexts RSVD |
- *     |     |          |        WOPCM       |
- *     |     |     +==> +--------------------+ <== GuC WOPCM Top
- *     |    GuC    ^    |                    |
- *     |    GGTT   |    |                    |
- *     |    Pin   GuC   |        GuC         |
- *     |    Bias WOPCM  |       WOPCM        |
- *     |     |    Size  |                    |
- *     |     |     |    |                    |
- *     v     v     v    |                    |
- *     +=====+=====+==> +====================+ <== GuC WOPCM Base
- *                      |   Non-GuC WOPCM    |
- *                      |   (HuC/Reserved)   |
- *                      +====================+ <== WOPCM Base
+ *     +===========> +====================+ <== FFFF_FFFF
+ *     ^             |      Reserved      |
+ *     |             +====================+ <== GUC_GGTT_TOP
+ *     |             |                    |
+ *     |             |        DRAM        |
+ *    GuC            |                    |
+ *  Address    +===> +====================+ <== GuC ggtt_pin_bias
+ *   Space     ^     |                    |
+ *     |       |     |                    |
+ *     |      GuC    |        GuC         |
+ *     |     WOPCM   |       WOPCM        |
+ *     |      Size   |                    |
+ *     |       |     |                    |
+ *     v       v     |                    |
+ *     +=======+===> +====================+ <== 0000_0000
  *
- * The lower part of GuC Address Space [0, ggtt_pin_bias) is mapped to WOPCM
+ * The lower part of GuC Address Space [0, ggtt_pin_bias) is mapped to GuC WOPCM
  * while upper part of GuC Address Space [ggtt_pin_bias, GUC_GGTT_TOP) is mapped
- * to DRAM. The value of the GuC ggtt_pin_bias is determined by WOPCM size and
- * actual GuC WOPCM size.
+ * to DRAM. The value of the GuC ggtt_pin_bias is the GuC WOPCM size.
  */
 
 /**
  * guc_init_ggtt_pin_bias() - Initialize the GuC ggtt_pin_bias value.
  * @guc: intel_guc structure.
  *
- * This function will calculate and initialize the ggtt_pin_bias value based on
- * overall WOPCM size and GuC WOPCM size.
+ * This function will calculate and initialize the ggtt_pin_bias value
+ * based on the GuC WOPCM size.
  */
 static void guc_init_ggtt_pin_bias(struct intel_guc *guc)
 {
 	struct drm_i915_private *i915 = guc_to_i915(guc);
 
 	GEM_BUG_ON(!i915->wopcm.size);
-	GEM_BUG_ON(i915->wopcm.size < i915->wopcm.guc.base);
 
-	guc->ggtt_pin_bias = i915->wopcm.size - i915->wopcm.guc.base;
+	guc->ggtt_pin_bias = i915->wopcm.guc.size;
 }
 
 /**
-- 
2.17.1

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[PATCH v7 2/6] drm/i915/guc: Do not partition WOPCM if GuC is not used

[Jakub Bartmiński]

There seems to be no reason for doing extra work on WOPCM partitioning
in the case GuC is not used, as the partitioning will not be used by the
intel_wopcm_init_hw function anyway.

Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_wopcm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_wopcm.c b/drivers/gpu/drm/i915/intel_wopcm.c
index 74bf76f3fddc..09cc62b0d7ca 100644
--- a/drivers/gpu/drm/i915/intel_wopcm.c
+++ b/drivers/gpu/drm/i915/intel_wopcm.c
@@ -163,6 +163,9 @@ int intel_wopcm_init(struct intel_wopcm *wopcm)
 	u32 guc_wopcm_rsvd;
 	int err;
 
+	if (!USES_GUC(dev_priv))
+		return 0;
+
 	GEM_BUG_ON(!wopcm->size);
 
 	if (guc_fw_size >= wopcm->size) {
-- 
2.17.1

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[PATCH v7 3/6] drm/i915/guc: Move the pin bias value from GuC to GGTT

[Jakub Bartmiński]

Removing the pin bias from GuC allows us to not check for GuC every time
we pin a context, which fixes the assertion error on unresolved GuC
platform default in mock contexts selftest.

It also seems that we were using uninitialized WOPCM variables when
setting the GuC pin bias. The pin bias has to be set after the WOPCM,
but before the call to i915_gem_contexts_init where the first contexts
are pinned.

v2:
This also makes it so that there's no need to set GuC variables from
within the WOPCM init function or to move the WOPCM init, while keeping
the correct initialization order. Also for mock tests the pin bias is
left at 0 and we make sure that the pin bias with GuC will not be
smaller than without GuC.

v3:
Avoid unused i915 in intel_guc_ggtt_offset if debug is disabled.

v4:
Squash with WOPCM init reordering.
Moved the i915_ggtt_pin_bias helper to this patch, and made some
functions use it instead of directly dereferencing i915->ggtt.

v5:
Since we now don't use wopcm.guc.base for the pin bias there's no need to
validate it. It also has already been verified in WOPCM init.

v6:
Moved and renamed the function which now returns the wopcm.guc.size to
intel_guc.c:intel_guc_wopcm_region_size to avoid any possible confusion
with the pin_bias in ggtt, which should be used for pinning.
Deleted the now unnecessarily introduced includes from previous versions.
Dropped naming changes from dev_priv to i915 for better patch readability.

v7:
Moved the same function again to intel_wopcm.c and renamed it to
intel_wopcm_reserved_gtt_size to better represent its use from the
gem_init_ggtt perspective.
Changed some comments to make more sense in the context they're in.

Fixes: f7dc0157e4b5 ("drm/i915/uc: Fetch GuC/HuC firmwares from guc/huc specific init")
Testcase: igt/drv_selftest/mock_contexts #GuC
Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 10 +---------
 drivers/gpu/drm/i915/i915_gem_gtt.c     |  9 +++++++++
 drivers/gpu/drm/i915/i915_gem_gtt.h     |  2 ++
 drivers/gpu/drm/i915/i915_vma.h         |  5 +++++
 drivers/gpu/drm/i915/intel_guc.c        | 25 +++----------------------
 drivers/gpu/drm/i915/intel_guc.h        | 11 ++++-------
 drivers/gpu/drm/i915/intel_huc.c        |  2 +-
 drivers/gpu/drm/i915/intel_uc_fw.c      |  2 +-
 drivers/gpu/drm/i915/intel_wopcm.h      | 17 +++++++++++++++++
 9 files changed, 43 insertions(+), 40 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index b10770cfccd2..32f96b8cd9c4 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -329,15 +329,7 @@ __create_hw_context(struct drm_i915_private *dev_priv,
 	ctx->desc_template =
 		default_desc_template(dev_priv, dev_priv->mm.aliasing_ppgtt);
 
-	/*
-	 * GuC requires the ring to be placed in Non-WOPCM memory. If GuC is not
-	 * present or not in use we still need a small bias as ring wraparound
-	 * at offset 0 sometimes hangs. No idea why.
-	 */
-	if (USES_GUC(dev_priv))
-		ctx->ggtt_offset_bias = dev_priv->guc.ggtt_pin_bias;
-	else
-		ctx->ggtt_offset_bias = I915_GTT_PAGE_SIZE;
+	ctx->ggtt_offset_bias = dev_priv->ggtt.pin_bias;
 
 	return ctx;
 
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index d0acef299b9c..01ad1ea436fb 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2917,6 +2917,15 @@ int i915_gem_init_ggtt(struct drm_i915_private *dev_priv)
 	struct drm_mm_node *entry;
 	int ret;
 
+	/*
+	 * GuC requires all resources that we're sharing with it to be placed in
+	 * non-WOPCM memory. If GuC is not present or not in use we still need a
+	 * small bias as ring wraparound at offset 0 sometimes hangs. No idea
+	 * why.
+	 */
+	ggtt->pin_bias = max_t(u32, I915_GTT_PAGE_SIZE,
+			       intel_wopcm_reserved_gtt_size(&dev_priv->wopcm));
+
 	ret = intel_vgt_balloon(dev_priv);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 14e62651010b..71e8cf24c800 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -396,6 +396,8 @@ struct i915_ggtt {
 
 	int mtrr;
 
+	u32 pin_bias;
+
 	struct drm_mm_node error_capture;
 };
 
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index f06d66377107..abf6144e3296 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -207,6 +207,11 @@ static inline u32 i915_ggtt_offset(const struct i915_vma *vma)
 	return lower_32_bits(vma->node.start);
 }
 
+static inline u32 i915_ggtt_pin_bias(struct i915_vma *vma)
+{
+	return i915_vm_to_ggtt(vma->vm)->pin_bias;
+}
+
 static inline struct i915_vma *i915_vma_get(struct i915_vma *vma)
 {
 	i915_gem_object_get(vma->obj);
diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index aa28368f8ba7..5e4a05dbe09b 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -27,8 +27,6 @@
 #include "intel_guc_submission.h"
 #include "i915_drv.h"
 
-static void guc_init_ggtt_pin_bias(struct intel_guc *guc);
-
 static void gen8_guc_raise_irq(struct intel_guc *guc)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
@@ -142,8 +140,6 @@ int intel_guc_init_misc(struct intel_guc *guc)
 	struct drm_i915_private *i915 = guc_to_i915(guc);
 	int ret;
 
-	guc_init_ggtt_pin_bias(guc);
-
 	ret = guc_init_wq(guc);
 	if (ret)
 		return ret;
@@ -603,22 +599,6 @@ int intel_guc_resume(struct intel_guc *guc)
  * to DRAM. The value of the GuC ggtt_pin_bias is the GuC WOPCM size.
  */
 
-/**
- * guc_init_ggtt_pin_bias() - Initialize the GuC ggtt_pin_bias value.
- * @guc: intel_guc structure.
- *
- * This function will calculate and initialize the ggtt_pin_bias value
- * based on the GuC WOPCM size.
- */
-static void guc_init_ggtt_pin_bias(struct intel_guc *guc)
-{
-	struct drm_i915_private *i915 = guc_to_i915(guc);
-
-	GEM_BUG_ON(!i915->wopcm.size);
-
-	guc->ggtt_pin_bias = i915->wopcm.guc.size;
-}
-
 /**
  * intel_guc_allocate_vma() - Allocate a GGTT VMA for GuC usage
  * @guc:	the guc
@@ -637,6 +617,7 @@ struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size)
 	struct drm_i915_private *dev_priv = guc_to_i915(guc);
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
+	u64 flags;
 	int ret;
 
 	obj = i915_gem_object_create(dev_priv, size);
@@ -647,8 +628,8 @@ struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size)
 	if (IS_ERR(vma))
 		goto err;
 
-	ret = i915_vma_pin(vma, 0, PAGE_SIZE,
-			   PIN_GLOBAL | PIN_OFFSET_BIAS | guc->ggtt_pin_bias);
+	flags = PIN_GLOBAL | PIN_OFFSET_BIAS | i915_ggtt_pin_bias(vma);
+	ret = i915_vma_pin(vma, 0, PAGE_SIZE, flags);
 	if (ret) {
 		vma = ERR_PTR(ret);
 		goto err;
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 4121928a495e..751f31c3c6c4 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -49,9 +49,6 @@ struct intel_guc {
 	struct intel_guc_log log;
 	struct intel_guc_ct ct;
 
-	/* Offset where Non-WOPCM memory starts. */
-	u32 ggtt_pin_bias;
-
 	/* Log snapshot if GuC errors during load */
 	struct drm_i915_gem_object *load_err_log;
 
@@ -130,10 +127,10 @@ static inline void intel_guc_to_host_event_handler(struct intel_guc *guc)
  * @vma: i915 graphics virtual memory area.
  *
  * GuC does not allow any gfx GGTT address that falls into range
- * [0, GuC ggtt_pin_bias), which is reserved for Boot ROM, SRAM and WOPCM.
- * Currently, in order to exclude [0, GuC ggtt_pin_bias) address space from
+ * [0, ggtt.pin_bias), which is reserved for Boot ROM, SRAM and WOPCM.
+ * Currently, in order to exclude [0, ggtt.pin_bias) address space from
  * GGTT, all gfx objects used by GuC are allocated with intel_guc_allocate_vma()
- * and pinned with PIN_OFFSET_BIAS along with the value of GuC ggtt_pin_bias.
+ * and pinned with PIN_OFFSET_BIAS along with the value of ggtt.pin_bias.
  *
  * Return: GGTT offset of the @vma.
  */
@@ -142,7 +139,7 @@ static inline u32 intel_guc_ggtt_offset(struct intel_guc *guc,
 {
 	u32 offset = i915_ggtt_offset(vma);
 
-	GEM_BUG_ON(offset < guc->ggtt_pin_bias);
+	GEM_BUG_ON(offset < i915_ggtt_pin_bias(vma));
 	GEM_BUG_ON(range_overflows_t(u64, offset, vma->size, GUC_GGTT_TOP));
 
 	return offset;
diff --git a/drivers/gpu/drm/i915/intel_huc.c b/drivers/gpu/drm/i915/intel_huc.c
index ffcad5fad6a7..37ef540dd280 100644
--- a/drivers/gpu/drm/i915/intel_huc.c
+++ b/drivers/gpu/drm/i915/intel_huc.c
@@ -63,7 +63,7 @@ int intel_huc_auth(struct intel_huc *huc)
 		return -ENOEXEC;
 
 	vma = i915_gem_object_ggtt_pin(huc->fw.obj, NULL, 0, 0,
-				       PIN_OFFSET_BIAS | guc->ggtt_pin_bias);
+				       PIN_OFFSET_BIAS | i915->ggtt.pin_bias);
 	if (IS_ERR(vma)) {
 		ret = PTR_ERR(vma);
 		DRM_ERROR("HuC: Failed to pin huc fw object %d\n", ret);
diff --git a/drivers/gpu/drm/i915/intel_uc_fw.c b/drivers/gpu/drm/i915/intel_uc_fw.c
index 6e8e0b546743..fd496416087c 100644
--- a/drivers/gpu/drm/i915/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/intel_uc_fw.c
@@ -222,7 +222,7 @@ int intel_uc_fw_upload(struct intel_uc_fw *uc_fw,
 		goto fail;
 	}
 
-	ggtt_pin_bias = to_i915(uc_fw->obj->base.dev)->guc.ggtt_pin_bias;
+	ggtt_pin_bias = to_i915(uc_fw->obj->base.dev)->ggtt.pin_bias;
 	vma = i915_gem_object_ggtt_pin(uc_fw->obj, NULL, 0, 0,
 				       PIN_OFFSET_BIAS | ggtt_pin_bias);
 	if (IS_ERR(vma)) {
diff --git a/drivers/gpu/drm/i915/intel_wopcm.h b/drivers/gpu/drm/i915/intel_wopcm.h
index 6298910a384c..dc640c160ba8 100644
--- a/drivers/gpu/drm/i915/intel_wopcm.h
+++ b/drivers/gpu/drm/i915/intel_wopcm.h
@@ -28,4 +28,21 @@ void intel_wopcm_init_early(struct intel_wopcm *wopcm);
 int intel_wopcm_init(struct intel_wopcm *wopcm);
 int intel_wopcm_init_hw(struct intel_wopcm *wopcm);
 
+/**
+ * intel_wopcm_reserved_gtt_size()
+ * @wopcm: pointer to intel_wopcm.
+ *
+ * The GuC WOPCM mapping shadows the lower part of the GGTT, so if we are using
+ * GuC we can't have any objects pinned in that region. This function returns
+ * the size of the shadowed region.
+ *
+ * Returns:
+ * 0 if GuC is not present or not in use.
+ * Otherwise, the GuC WOPCM size.
+ */
+static inline u32 intel_wopcm_reserved_gtt_size(struct intel_wopcm *wopcm)
+{
+	return wopcm->guc.size;
+}
+
 #endif
-- 
2.17.1

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[PATCH v7 4/6] drm/i915: Remove unnecessary ggtt_offset_bias from i915_gem_context

[Jakub Bartmiński]

Since ggtt_offset_bias is now stored in ggtt.pin_bias, it is duplicated
inside i915_gem_context, and can instead be accessed directly from ggtt.

v3:
Added a helper function to retrieve the ggtt.pin_bias from the vma.

v4:
Moved the helper function to the previous patch in the series.
Dropped the bias from intel_ring_pin. This introduces a slight functional
change since we are always pinning the ring a bit higher if GuC is present
even though we don't really need to.

Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_context.c |  2 --
 drivers/gpu/drm/i915/i915_gem_context.h |  3 ---
 drivers/gpu/drm/i915/intel_lrc.c        |  6 ++----
 drivers/gpu/drm/i915/intel_ringbuffer.c | 14 ++++++--------
 drivers/gpu/drm/i915/intel_ringbuffer.h |  4 +---
 5 files changed, 9 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 32f96b8cd9c4..f15a039772db 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -329,8 +329,6 @@ __create_hw_context(struct drm_i915_private *dev_priv,
 	ctx->desc_template =
 		default_desc_template(dev_priv, dev_priv->mm.aliasing_ppgtt);
 
-	ctx->ggtt_offset_bias = dev_priv->ggtt.pin_bias;
-
 	return ctx;
 
 err_pid:
diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h
index b116e4942c10..851dad6decd7 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/i915_gem_context.h
@@ -147,9 +147,6 @@ struct i915_gem_context {
 
 	struct i915_sched_attr sched;
 
-	/** ggtt_offset_bias: placement restriction for context objects */
-	u32 ggtt_offset_bias;
-
 	/** engine: per-engine logical HW state */
 	struct intel_context {
 		struct i915_gem_context *gem_context;
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 35d37af0cb9a..c923eb998c28 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1363,9 +1363,7 @@ static int __context_pin(struct i915_gem_context *ctx, struct i915_vma *vma)
 	}
 
 	flags = PIN_GLOBAL | PIN_HIGH;
-	if (ctx->ggtt_offset_bias)
-		flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias;
-
+	flags |= PIN_OFFSET_BIAS | i915_ggtt_pin_bias(vma);
 	return i915_vma_pin(vma, 0, GEN8_LR_CONTEXT_ALIGN, flags);
 }
 
@@ -1392,7 +1390,7 @@ __execlists_context_pin(struct intel_engine_cs *engine,
 		goto unpin_vma;
 	}
 
-	ret = intel_ring_pin(ce->ring, ctx->i915, ctx->ggtt_offset_bias);
+	ret = intel_ring_pin(ce->ring, ctx->i915);
 	if (ret)
 		goto unpin_map;
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f4bd185c9369..8a48325249a3 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1005,9 +1005,7 @@ i915_emit_bb_start(struct i915_request *rq,
 
 
 
-int intel_ring_pin(struct intel_ring *ring,
-		   struct drm_i915_private *i915,
-		   unsigned int offset_bias)
+int intel_ring_pin(struct intel_ring *ring, struct drm_i915_private *i915)
 {
 	enum i915_map_type map = HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC;
 	struct i915_vma *vma = ring->vma;
@@ -1017,10 +1015,11 @@ int intel_ring_pin(struct intel_ring *ring,
 
 	GEM_BUG_ON(ring->vaddr);
 
-
 	flags = PIN_GLOBAL;
-	if (offset_bias)
-		flags |= PIN_OFFSET_BIAS | offset_bias;
+
+	/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
+	flags |= PIN_OFFSET_BIAS | i915_ggtt_pin_bias(vma);
+
 	if (vma->obj->stolen)
 		flags |= PIN_MAPPABLE;
 	else
@@ -1404,8 +1403,7 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
 		goto err;
 	}
 
-	/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
-	err = intel_ring_pin(ring, engine->i915, I915_GTT_PAGE_SIZE);
+	err = intel_ring_pin(ring, engine->i915);
 	if (err)
 		goto err_ring;
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index d1eee08e5f6b..7fe07b2de2a7 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -784,9 +784,7 @@ struct intel_ring *
 intel_engine_create_ring(struct intel_engine_cs *engine,
 			 struct i915_timeline *timeline,
 			 int size);
-int intel_ring_pin(struct intel_ring *ring,
-		   struct drm_i915_private *i915,
-		   unsigned int offset_bias);
+int intel_ring_pin(struct intel_ring *ring, struct drm_i915_private *i915);
 void intel_ring_reset(struct intel_ring *ring, u32 tail);
 unsigned int intel_ring_update_space(struct intel_ring *ring);
 void intel_ring_unpin(struct intel_ring *ring);
-- 
2.17.1

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[PATCH v7 5/6] drm/i915: Add a fault injection point to WOPCM init

[Jakub Bartmiński]

Add a fault injection point in the WOPCM initialization path.

v4:
Move the injection inside the WOPCM init function.

Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
---
 drivers/gpu/drm/i915/intel_wopcm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_wopcm.c b/drivers/gpu/drm/i915/intel_wopcm.c
index 09cc62b0d7ca..92cb82dd0c07 100644
--- a/drivers/gpu/drm/i915/intel_wopcm.c
+++ b/drivers/gpu/drm/i915/intel_wopcm.c
@@ -168,6 +168,9 @@ int intel_wopcm_init(struct intel_wopcm *wopcm)
 
 	GEM_BUG_ON(!wopcm->size);
 
+	if (i915_inject_load_failure())
+		return -E2BIG;
+
 	if (guc_fw_size >= wopcm->size) {
 		DRM_ERROR("GuC FW (%uKiB) is too big to fit in WOPCM.",
 			  guc_fw_size / 1024);
-- 
2.17.1

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[PATCH v7 6/6] HAX enable GuC for CI

[Jakub Bartmiński]

From: Michal Wajdeczko <michal.wajdeczko@intel.com>

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
---
 drivers/gpu/drm/i915/i915_params.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index aebe0469ddaa..3e4e128237ac 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -47,7 +47,7 @@ struct drm_printer;
 	param(int, disable_power_well, -1) \
 	param(int, enable_ips, 1) \
 	param(int, invert_brightness, 0) \
-	param(int, enable_guc, 0) \
+	param(int, enable_guc, -1) \
 	param(int, guc_log_level, -1) \
 	param(char *, guc_firmware_path, NULL) \
 	param(char *, huc_firmware_path, NULL) \
-- 
2.17.1

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Re: [PATCH v7 5/6] drm/i915: Add a fault injection point to WOPCM init

[Chris Wilson]

Quoting Jakub Bartmiński (2018-07-27 13:08:55)
> Add a fault injection point in the WOPCM initialization path.
> 
> v4:
> Move the injection inside the WOPCM init function.
> 
> Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Michał Winiarski <michal.winiarski@intel.com>
> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris
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Re: [PATCH v7 3/6] drm/i915/guc: Move the pin bias value from GuC to GGTT

[Chris Wilson]

Quoting Jakub Bartmiński (2018-07-27 13:08:53)
> Removing the pin bias from GuC allows us to not check for GuC every time
> we pin a context, which fixes the assertion error on unresolved GuC
> platform default in mock contexts selftest.
> 
> It also seems that we were using uninitialized WOPCM variables when
> setting the GuC pin bias. The pin bias has to be set after the WOPCM,
> but before the call to i915_gem_contexts_init where the first contexts
> are pinned.
> 
> v2:
> This also makes it so that there's no need to set GuC variables from
> within the WOPCM init function or to move the WOPCM init, while keeping
> the correct initialization order. Also for mock tests the pin bias is
> left at 0 and we make sure that the pin bias with GuC will not be
> smaller than without GuC.
> 
> v3:
> Avoid unused i915 in intel_guc_ggtt_offset if debug is disabled.
> 
> v4:
> Squash with WOPCM init reordering.
> Moved the i915_ggtt_pin_bias helper to this patch, and made some
> functions use it instead of directly dereferencing i915->ggtt.
> 
> v5:
> Since we now don't use wopcm.guc.base for the pin bias there's no need to
> validate it. It also has already been verified in WOPCM init.
> 
> v6:
> Moved and renamed the function which now returns the wopcm.guc.size to
> intel_guc.c:intel_guc_wopcm_region_size to avoid any possible confusion
> with the pin_bias in ggtt, which should be used for pinning.
> Deleted the now unnecessarily introduced includes from previous versions.
> Dropped naming changes from dev_priv to i915 for better patch readability.
> 
> v7:
> Moved the same function again to intel_wopcm.c and renamed it to
> intel_wopcm_reserved_gtt_size to better represent its use from the
> gem_init_ggtt perspective.
> Changed some comments to make more sense in the context they're in.
> 
> Fixes: f7dc0157e4b5 ("drm/i915/uc: Fetch GuC/HuC firmwares from guc/huc specific init")
> Testcase: igt/drv_selftest/mock_contexts #GuC
> Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Michał Winiarski <michal.winiarski@intel.com>
> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

Michal may prefer to call it intel_guc_reserved_gtt_size (or something
along those lines) in which case just resend this patch with the change
(in reply to this patch). However, we do have intel_wopcm_init et al
which I think weakens the argument that this belongs only to the guc.
-Chris
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Re: [PATCH v7 3/6] drm/i915/guc: Move the pin bias value from GuC to GGTT

[Michal Wajdeczko]

On Fri, 27 Jul 2018 14:18:57 +0200, Chris Wilson  
<chris@chris-wilson.co.uk> wrote:

> Quoting Jakub Bartmiński (2018-07-27 13:08:53)
>> Removing the pin bias from GuC allows us to not check for GuC every time
>> we pin a context, which fixes the assertion error on unresolved GuC
>> platform default in mock contexts selftest.
>>
>> It also seems that we were using uninitialized WOPCM variables when
>> setting the GuC pin bias. The pin bias has to be set after the WOPCM,
>> but before the call to i915_gem_contexts_init where the first contexts
>> are pinned.
>>
>> v2:
>> This also makes it so that there's no need to set GuC variables from
>> within the WOPCM init function or to move the WOPCM init, while keeping
>> the correct initialization order. Also for mock tests the pin bias is
>> left at 0 and we make sure that the pin bias with GuC will not be
>> smaller than without GuC.
>>
>> v3:
>> Avoid unused i915 in intel_guc_ggtt_offset if debug is disabled.
>>
>> v4:
>> Squash with WOPCM init reordering.
>> Moved the i915_ggtt_pin_bias helper to this patch, and made some
>> functions use it instead of directly dereferencing i915->ggtt.
>>
>> v5:
>> Since we now don't use wopcm.guc.base for the pin bias there's no need  
>> to
>> validate it. It also has already been verified in WOPCM init.
>>
>> v6:
>> Moved and renamed the function which now returns the wopcm.guc.size to
>> intel_guc.c:intel_guc_wopcm_region_size to avoid any possible confusion
>> with the pin_bias in ggtt, which should be used for pinning.
>> Deleted the now unnecessarily introduced includes from previous  
>> versions.
>> Dropped naming changes from dev_priv to i915 for better patch  
>> readability.
>>
>> v7:
>> Moved the same function again to intel_wopcm.c and renamed it to
>> intel_wopcm_reserved_gtt_size to better represent its use from the
>> gem_init_ggtt perspective.
>> Changed some comments to make more sense in the context they're in.
>>
>> Fixes: f7dc0157e4b5 ("drm/i915/uc: Fetch GuC/HuC firmwares from guc/huc  
>> specific init")
>> Testcase: igt/drv_selftest/mock_contexts #GuC
>> Signed-off-by: Jakub Bartmiński <jakub.bartminski@intel.com>
>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>> Cc: Michał Winiarski <michal.winiarski@intel.com>
>> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
>
> Michal may prefer to call it intel_guc_reserved_gtt_size (or something
> along those lines) in which case just resend this patch with the change
> (in reply to this patch).

u32 intel_guc_reserved_gtt_size(struct intel_guc *guc) would be fine.

> However, we do have intel_wopcm_init et al
> which I think weakens the argument that this belongs only to the guc.

But WOPCM itself does not care about GGTT. Only GuC needs to tweak its
GGTT mapping according to size of the GUC_WOPCM region, and only GuC
knowns other restrictions that have to applied (see GUC_GGTT_TOP)

Michal
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✗ Fi.CI.BAT: failure for series starting with [v7,1/6] drm/i915/guc: Avoid wasting memory on incorrect GuC pin bias

[Patchwork]

== Series Details ==

Series: series starting with [v7,1/6] drm/i915/guc: Avoid wasting memory on incorrect GuC pin bias
URL   : https://patchwork.freedesktop.org/series/47340/
State : failure

== Summary ==

Applying: drm/i915/guc: Avoid wasting memory on incorrect GuC pin bias
Applying: drm/i915/guc: Do not partition WOPCM if GuC is not used
Applying: drm/i915/guc: Move the pin bias value from GuC to GGTT
error: sha1 information is lacking or useless (drivers/gpu/drm/i915/intel_guc.c).
error: could not build fake ancestor
Patch failed at 0003 drm/i915/guc: Move the pin bias value from GuC to GGTT
Use 'git am --show-current-patch' to see the failed patch
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

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