From: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Manual pointer manipulation is error prone. Let compiler calculate
right offsets for us in case we need to change ads layout.
v2: don't call it object (Chris)
v3: restyle offset assignments (Chris)
v4: stylistic reductions
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
Cc: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_guc_submission.c | 69 ++++++++++++++----------------
drivers/gpu/drm/i915/i915_utils.h | 2 +
2 files changed, 33 insertions(+), 38 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index b4d24cd7639a..5ec2cbda2ba9 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -810,22 +810,21 @@ static void guc_addon_create(struct intel_guc *guc)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
struct i915_vma *vma;
- struct guc_ads *ads;
- struct guc_policies *policies;
- struct guc_mmio_reg_state *reg_state;
- struct intel_engine_cs *engine;
- enum intel_engine_id id;
struct page *page;
- u32 size;
-
/* The ads obj includes the struct itself and buffers passed to GuC */
- size = sizeof(struct guc_ads) + sizeof(struct guc_policies) +
- sizeof(struct guc_mmio_reg_state) +
- GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE;
+ struct {
+ struct guc_ads ads;
+ struct guc_policies policies;
+ struct guc_mmio_reg_state reg_state;
+ u8 reg_state_buffer[GUC_S3_SAVE_SPACE_PAGES * PAGE_SIZE];
+ } __packed *blob;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ u32 base;
vma = guc->ads_vma;
if (!vma) {
- vma = intel_guc_allocate_vma(guc, PAGE_ALIGN(size));
+ vma = intel_guc_allocate_vma(guc, PAGE_ALIGN(sizeof(*blob)));
if (IS_ERR(vma))
return;
@@ -833,44 +832,38 @@ static void guc_addon_create(struct intel_guc *guc)
}
page = i915_vma_first_page(vma);
- ads = kmap(page);
-
- /*
- * The GuC requires a "Golden Context" when it reinitialises
- * engines after a reset. Here we use the Render ring default
- * context, which must already exist and be pinned in the GGTT,
- * so its address won't change after we've told the GuC where
- * to find it.
- */
- engine = dev_priv->engine[RCS];
- ads->golden_context_lrca = engine->status_page.ggtt_offset;
-
- for_each_engine(engine, dev_priv, id)
- ads->eng_state_size[engine->guc_id] = intel_lr_context_size(engine);
+ blob = kmap(page);
/* GuC scheduling policies */
- policies = (void *)ads + sizeof(struct guc_ads);
- guc_policies_init(policies);
-
- ads->scheduler_policies =
- guc_ggtt_offset(vma) + sizeof(struct guc_ads);
+ guc_policies_init(&blob->policies);
/* MMIO reg state */
- reg_state = (void *)policies + sizeof(struct guc_policies);
-
for_each_engine(engine, dev_priv, id) {
- reg_state->mmio_white_list[engine->guc_id].mmio_start =
+ blob->reg_state.mmio_white_list[engine->guc_id].mmio_start =
engine->mmio_base + GUC_MMIO_WHITE_LIST_START;
/* Nothing to be saved or restored for now. */
- reg_state->mmio_white_list[engine->guc_id].count = 0;
+ blob->reg_state.mmio_white_list[engine->guc_id].count = 0;
}
- ads->reg_state_addr = ads->scheduler_policies +
- sizeof(struct guc_policies);
+ /*
+ * The GuC requires a "Golden Context" when it reinitialises
+ * engines after a reset. Here we use the Render ring default
+ * context, which must already exist and be pinned in the GGTT,
+ * so its address won't change after we've told the GuC where
+ * to find it.
+ */
+ blob->ads.golden_context_lrca =
+ dev_priv->engine[RCS]->status_page.ggtt_offset;
+
+ for_each_engine(engine, dev_priv, id)
+ blob->ads.eng_state_size[engine->guc_id] =
+ intel_lr_context_size(engine);
- ads->reg_state_buffer = ads->reg_state_addr +
- sizeof(struct guc_mmio_reg_state);
+ base = guc_ggtt_offset(vma);
+ blob->ads.scheduler_policies = base + ptr_offset(blob, policies);
+ blob->ads.reg_state_buffer = base + ptr_offset(blob, reg_state_buffer);
+ blob->ads.reg_state_addr = base + ptr_offset(blob, reg_state);
kunmap(page);
}
diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h
index b8ba0f2f92af..94a3a3299910 100644
--- a/drivers/gpu/drm/i915/i915_utils.h
+++ b/drivers/gpu/drm/i915/i915_utils.h
@@ -66,6 +66,8 @@
#define ptr_pack_bits(ptr, bits) \
((typeof(ptr))((unsigned long)(ptr) | (bits)))
+#define ptr_offset(ptr, member) offsetof(typeof(*(ptr)), member)
+
#define fetch_and_zero(ptr) ({ \
typeof(*ptr) __T = *(ptr); \
*(ptr) = (typeof(*ptr))0; \
--
2.11.0
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