Create a separate kernel context if a platform requires
GGTT updates using MI_UPDATE_GTT blitter command.
Subsequent patch will introduce methods to update
GGTT using this bind context and MI_UPDATE_GTT blitter
command.
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Reviewed-by: Oak Zeng <oak.zeng@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_engine.h | 2 ++
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 35 +++++++++++++++++++-
drivers/gpu/drm/i915/gt/intel_engine_types.h | 3 ++
drivers/gpu/drm/i915/gt/intel_gt.c | 18 ++++++++++
drivers/gpu/drm/i915/gt/intel_gt.h | 2 ++
5 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index b58c30ac8ef0..40269e4c1e31 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_BIND 0x46
+#define I915_GEM_HWS_GGTT_BIND_ADDR (I915_GEM_HWS_GGTT_BIND * 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
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 84a75c95f3f7..0a58fe812ec5 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1418,6 +1418,20 @@ void intel_engine_destroy_pinned_context(struct intel_context *ce)
intel_context_put(ce);
}
+static struct intel_context *
+create_ggtt_bind_context(struct intel_engine_cs *engine)
+{
+ static struct lock_class_key kernel;
+
+ /*
+ * MI_UPDATE_GTT can insert up to 512 PTE entries and there could be multiple
+ * bind requets at a time so get a bigger ring.
+ */
+ return intel_engine_create_pinned_context(engine, engine->gt->vm, SZ_512K,
+ I915_GEM_HWS_GGTT_BIND_ADDR,
+ &kernel, "ggtt_bind_context");
+}
+
static struct intel_context *
create_kernel_context(struct intel_engine_cs *engine)
{
@@ -1441,7 +1455,7 @@ 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);
@@ -1457,6 +1471,19 @@ 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 with blitter engine
+ * if a platform require such service. MI_UPDATE_GTT works on other
+ * engines as well but BCS should be less busy engine so pick that for
+ * GGTT updates.
+ */
+ if (engine->id == BCS0) {
+ bce = create_ggtt_bind_context(engine);
+ if (IS_ERR(bce)) {
+ intel_engine_destroy_pinned_context(ce);
+ return PTR_ERR(bce);
+ }
+ }
ret = measure_breadcrumb_dw(ce);
if (ret < 0)
@@ -1464,11 +1491,14 @@ static int engine_init_common(struct intel_engine_cs *engine)
engine->emit_fini_breadcrumb_dw = ret;
engine->kernel_context = ce;
+ engine->bind_context = bce;
return 0;
err_context:
intel_engine_destroy_pinned_context(ce);
+ if (bce)
+ intel_engine_destroy_pinned_context(ce);
return ret;
}
@@ -1536,6 +1566,9 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine)
if (engine->kernel_context)
intel_engine_destroy_pinned_context(engine->kernel_context);
+ if (engine->bind_context)
+ intel_engine_destroy_pinned_context(engine->bind_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 a7e677598004..a8f527fab0f0 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -416,6 +416,9 @@ struct intel_engine_cs {
struct llist_head barrier_tasks;
struct intel_context *kernel_context; /* pinned */
+ struct intel_context *bind_context; /* pinned, only for BCS0 */
+ /* mark the bind context's availability status */
+ bool bind_context_ready;
/**
* pinned_contexts_list: List of pinned contexts. This list is only
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 449f0b7fc843..cd0ff1597db9 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -1019,3 +1019,21 @@ enum i915_map_type intel_gt_coherent_map_type(struct intel_gt *gt,
else
return I915_MAP_WC;
}
+
+void intel_gt_bind_context_set_ready(struct intel_gt *gt, bool ready)
+{
+ struct intel_engine_cs *engine = gt->engine[BCS0];
+
+ if (engine && engine->bind_context)
+ engine->bind_context_ready = ready;
+}
+
+bool intel_gt_is_bind_context_ready(struct intel_gt *gt)
+{
+ struct intel_engine_cs *engine = gt->engine[BCS0];
+
+ if (engine)
+ return engine->bind_context_ready;
+
+ return false;
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 239848bcb2a4..9e70e625cebc 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -180,4 +180,6 @@ enum i915_map_type intel_gt_coherent_map_type(struct intel_gt *gt,
struct drm_i915_gem_object *obj,
bool always_coherent);
+void intel_gt_bind_context_set_ready(struct intel_gt *gt, bool ready);
+bool intel_gt_is_bind_context_ready(struct intel_gt *gt);
#endif /* __INTEL_GT_H__ */
--
2.41.0
