[1/3] drm/i915: Create a blitter context for GGTT updates

Commit Message

Andi Shyti Aug. 18, 2023, 7:42 p.m. UTC

From: Nirmoy Das <[e-mail]>

Create a separate blitter context if a platform requires
GGTT updates using MI_UPDATE_GTT blitter command.

Subsequent patch will introduce methods to update
GGTT using this blitter context and MI_UPDATE_GTT blitter
command.

Signed-off-by: Nirmoy Das <[e-mail]>
---
 drivers/gpu/drm/i915/gt/intel_engine.h       |  4 ++
 drivers/gpu/drm/i915/gt/intel_engine_cs.c    | 44 +++++++++++++++++++-
 drivers/gpu/drm/i915/gt/intel_engine_types.h |  3 ++
 drivers/gpu/drm/i915/gt/intel_gtt.c          |  4 ++
 drivers/gpu/drm/i915/gt/intel_gtt.h          |  2 +
 5 files changed, 56 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index b58c30ac8ef02..ee36db2fdaa7c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -170,6 +170,8 @@  intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
 #define I915_GEM_HWS_SEQNO		0x40
 #define I915_GEM_HWS_SEQNO_ADDR		(I915_GEM_HWS_SEQNO * sizeof(u32))
 #define I915_GEM_HWS_MIGRATE		(0x42 * sizeof(u32))
+#define I915_GEM_HWS_GGTT_BLIT		0x46
+#define I915_GEM_HWS_GGTT_BLIT_ADDR	(I915_GEM_HWS_GGTT_BLIT * sizeof(u32))
 #define I915_GEM_HWS_PXP		0x60
 #define I915_GEM_HWS_PXP_ADDR		(I915_GEM_HWS_PXP * sizeof(u32))
 #define I915_GEM_HWS_GSC		0x62
@@ -356,4 +358,6 @@  u64 intel_clamp_preempt_timeout_ms(struct intel_engine_cs *engine, u64 value);
 u64 intel_clamp_stop_timeout_ms(struct intel_engine_cs *engine, u64 value);
 u64 intel_clamp_timeslice_duration_ms(struct intel_engine_cs *engine, u64 value);
 
+void intel_engine_blitter_context_set_ready(struct intel_gt *gt, bool ready);
+bool intel_engine_blitter_context_ready(struct intel_gt *gt);
 #endif /* _INTEL_RINGBUFFER_H_ */
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index ee15486fed0da..9871ee5ab754b 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -27,6 +27,7 @@ 
 #include "intel_gt_mcr.h"
 #include "intel_gt_pm.h"
 #include "intel_gt_requests.h"
+#include "intel_gtt.h"
 #include "intel_lrc.h"
 #include "intel_lrc_reg.h"
 #include "intel_reset.h"
@@ -1419,6 +1420,34 @@  void intel_engine_destroy_pinned_context(struct intel_context *ce)
 	intel_context_put(ce);
 }
 
+void intel_engine_blitter_context_set_ready(struct intel_gt *gt, bool ready)
+{
+	struct intel_engine_cs *engine = gt->engine[BCS0];
+
+	if (engine && engine->blitter_context)
+		atomic_set(&engine->blitter_context_ready, ready ? 1 : 0);
+}
+
+bool intel_engine_blitter_context_ready(struct intel_gt *gt)
+{
+	struct intel_engine_cs *engine = gt->engine[BCS0];
+
+	if (engine)
+		return atomic_read(&engine->blitter_context_ready) == 1;
+
+	return false;
+}
+
+static struct intel_context *
+create_ggtt_blitter_context(struct intel_engine_cs *engine)
+{
+	static struct lock_class_key kernel;
+
+	/* MI_UPDATE_GTT can insert upto 512 PTE entries so get a bigger ring */
+	return intel_engine_create_pinned_context(engine, engine->gt->vm, SZ_512K,
+						  I915_GEM_HWS_GGTT_BLIT_ADDR,
+						  &kernel, "ggtt_blitter_context");
+}
 static struct intel_context *
 create_kernel_context(struct intel_engine_cs *engine)
 {
@@ -1442,7 +1471,7 @@  create_kernel_context(struct intel_engine_cs *engine)
  */
 static int engine_init_common(struct intel_engine_cs *engine)
 {
-	struct intel_context *ce;
+	struct intel_context *ce, *bce = NULL;
 	int ret;
 
 	engine->set_default_submission(engine);
@@ -1458,6 +1487,15 @@  static int engine_init_common(struct intel_engine_cs *engine)
 	ce = create_kernel_context(engine);
 	if (IS_ERR(ce))
 		return PTR_ERR(ce);
+	/*
+	 * Create a separate pinned context for GGTT update using blitter
+	 * if a platform require such service.
+	 */
+	if (i915_ggtt_require_blitter(engine->i915) && engine->id == BCS0) {
+		bce = create_ggtt_blitter_context(engine);
+		if (IS_ERR(bce))
+			return PTR_ERR(bce);
+	}
 
 	ret = measure_breadcrumb_dw(ce);
 	if (ret < 0)
@@ -1465,6 +1503,7 @@  static int engine_init_common(struct intel_engine_cs *engine)
 
 	engine->emit_fini_breadcrumb_dw = ret;
 	engine->kernel_context = ce;
+	engine->blitter_context = bce;
 
 	return 0;
 
@@ -1537,6 +1576,9 @@  void intel_engine_cleanup_common(struct intel_engine_cs *engine)
 
 	if (engine->kernel_context)
 		intel_engine_destroy_pinned_context(engine->kernel_context);
+	if (engine->blitter_context)
+		intel_engine_destroy_pinned_context(engine->blitter_context);
+
 
 	GEM_BUG_ON(!llist_empty(&engine->barrier_tasks));
 	cleanup_status_page(engine);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index e99a6fa03d453..62095c0d8783d 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -415,6 +415,9 @@  struct intel_engine_cs {
 	struct llist_head barrier_tasks;
 
 	struct intel_context *kernel_context; /* pinned */
+	struct intel_context *blitter_context; /* pinned, only for BCS0 */
+	/* mark the blitter engine's availability status */
+	atomic_t blitter_context_ready;
 
 	/**
 	 * pinned_contexts_list: List of pinned contexts. This list is only
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index 13944a14ea2d1..9c77c97670fea 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -21,6 +21,10 @@ 
 #include "intel_gt_regs.h"
 #include "intel_gtt.h"
 
+bool i915_ggtt_require_blitter(struct drm_i915_private *i915)
+{
+	return IS_METEORLAKE(i915);
+}
 
 static bool intel_ggtt_update_needs_vtd_wa(struct drm_i915_private *i915)
 {
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 4d6296cdbcfdd..9710eb031fb2c 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -688,4 +688,6 @@  static inline struct sgt_dma {
 	return (struct sgt_dma){ sg, addr, addr + sg_dma_len(sg) };
 }
 
+bool i915_ggtt_require_blitter(struct drm_i915_private *i915);
+
 #endif