Re: [PATCH 17/26] drm/i915/guc: Connect UAPI to GuC multi-lrc interface

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On 10/4/2021 15:06, Matthew Brost wrote:
Introduce 'set parallel submit' extension to connect UAPI to GuC
multi-lrc interface. Kernel doc in new uAPI should explain it all.

IGT: https://patchwork.freedesktop.org/patch/447008/?series=93071&rev=1
media UMD: https://github.com/intel/media-driver/pull/1252

v2:
  (Daniel Vetter)
   - Add IGT link and placeholder for media UMD link
v3:
  (Kernel test robot)
   - Fix warning in unpin engines call
  (John Harrison)
   - Reword a bunch of the kernel doc

Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
  drivers/gpu/drm/i915/gem/i915_gem_context.c   | 221 +++++++++++++++++-
  .../gpu/drm/i915/gem/i915_gem_context_types.h |   6 +
  drivers/gpu/drm/i915/gt/intel_context_types.h |   9 +-
  drivers/gpu/drm/i915/gt/intel_engine.h        |  12 +-
  drivers/gpu/drm/i915/gt/intel_engine_cs.c     |   6 +-
  .../drm/i915/gt/intel_execlists_submission.c  |   6 +-
  drivers/gpu/drm/i915/gt/selftest_execlists.c  |  12 +-
  .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 114 ++++++++-
  include/uapi/drm/i915_drm.h                   | 131 +++++++++++
  9 files changed, 489 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 8c7ea6e56262..6290bc20ccb1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -522,9 +522,150 @@ set_proto_ctx_engines_bond(struct i915_user_extension __user *base, void *data)
  	return 0;
  }
+static int
+set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base,
+				      void *data)
+{
+	struct i915_context_engines_parallel_submit __user *ext =
+		container_of_user(base, typeof(*ext), base);
+	const struct set_proto_ctx_engines *set = data;
+	struct drm_i915_private *i915 = set->i915;
+	u64 flags;
+	int err = 0, n, i, j;
+	u16 slot, width, num_siblings;
+	struct intel_engine_cs **siblings = NULL;
+	intel_engine_mask_t prev_mask;
+
+	/* Disabling for now */
+	return -ENODEV;
+
+	/* FIXME: This is NIY for execlists */
+	if (!(intel_uc_uses_guc_submission(&i915->gt.uc)))
+		return -ENODEV;
+
+	if (get_user(slot, &ext->engine_index))
+		return -EFAULT;
+
+	if (get_user(width, &ext->width))
+		return -EFAULT;
+
+	if (get_user(num_siblings, &ext->num_siblings))
+		return -EFAULT;
+
+	if (slot >= set->num_engines) {
+		drm_dbg(&i915->drm, "Invalid placement value, %d >= %d\n",
+			slot, set->num_engines);
+		return -EINVAL;
+	}
+
+	if (set->engines[slot].type != I915_GEM_ENGINE_TYPE_INVALID) {
+		drm_dbg(&i915->drm,
+			"Invalid placement[%d], already occupied\n", slot);
+		return -EINVAL;
+	}
+
+	if (get_user(flags, &ext->flags))
+		return -EFAULT;
+
+	if (flags) {
+		drm_dbg(&i915->drm, "Unknown flags 0x%02llx", flags);
+		return -EINVAL;
+	}
+
+	for (n = 0; n < ARRAY_SIZE(ext->mbz64); n++) {
+		err = check_user_mbz(&ext->mbz64[n]);
+		if (err)
+			return err;
+	}
+
+	if (width < 2) {
+		drm_dbg(&i915->drm, "Width (%d) < 2\n", width);
+		return -EINVAL;
+	}
+
+	if (num_siblings < 1) {
+		drm_dbg(&i915->drm, "Number siblings (%d) < 1\n",
+			num_siblings);
+		return -EINVAL;
+	}
+
+	siblings = kmalloc_array(num_siblings * width,
+				 sizeof(*siblings),
+				 GFP_KERNEL);
+	if (!siblings)
+		return -ENOMEM;
+
+	/* Create contexts / engines */
+	for (i = 0; i < width; ++i) {
+		intel_engine_mask_t current_mask = 0;
+		struct i915_engine_class_instance prev_engine;
+
+		for (j = 0; j < num_siblings; ++j) {
+			struct i915_engine_class_instance ci;
+
+			n = i * num_siblings + j;
+			if (copy_from_user(&ci, &ext->engines[n], sizeof(ci))) {
+				err = -EFAULT;
+				goto out_err;
+			}
+
+			siblings[n] =
+				intel_engine_lookup_user(i915, ci.engine_class,
+							 ci.engine_instance);
+			if (!siblings[n]) {
+				drm_dbg(&i915->drm,
+					"Invalid sibling[%d]: { class:%d, inst:%d }\n",
+					n, ci.engine_class, ci.engine_instance);
+				err = -EINVAL;
+				goto out_err;
+			}
+
+			if (n) {
+				if (prev_engine.engine_class !=
+				    ci.engine_class) {
+					drm_dbg(&i915->drm,
+						"Mismatched class %d, %d\n",
+						prev_engine.engine_class,
+						ci.engine_class);
+					err = -EINVAL;
+					goto out_err;
+				}
+			}
+
+			prev_engine = ci;
+			current_mask |= siblings[n]->logical_mask;
+		}
+
+		if (i > 0) {
+			if (current_mask != prev_mask << 1) {
+				drm_dbg(&i915->drm,
+					"Non contiguous logical mask 0x%x, 0x%x\n",
+					prev_mask, current_mask);
+				err = -EINVAL;
+				goto out_err;
+			}
+		}
+		prev_mask = current_mask;
+	}
+
+	set->engines[slot].type = I915_GEM_ENGINE_TYPE_PARALLEL;
+	set->engines[slot].num_siblings = num_siblings;
+	set->engines[slot].width = width;
+	set->engines[slot].siblings = siblings;
+
+	return 0;
+
+out_err:
+	kfree(siblings);
+
+	return err;
+}
+
  static const i915_user_extension_fn set_proto_ctx_engines_extensions[] = {
  	[I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE] = set_proto_ctx_engines_balance,
  	[I915_CONTEXT_ENGINES_EXT_BOND] = set_proto_ctx_engines_bond,
+	[I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT] =
+		set_proto_ctx_engines_parallel_submit,
  };
static int set_proto_ctx_engines(struct drm_i915_file_private *fpriv,
@@ -775,6 +916,25 @@ static int intel_context_set_gem(struct intel_context *ce,
  	return ret;
  }
+static void __unpin_engines(struct i915_gem_engines *e, unsigned int count)
+{
+	while (count--) {
+		struct intel_context *ce = e->engines[count], *child;
+
+		if (!ce || !test_bit(CONTEXT_PERMA_PIN, &ce->flags))
+			continue;
+
+		for_each_child(ce, child)
+			intel_context_unpin(child);
+		intel_context_unpin(ce);
+	}
+}
+
+static void unpin_engines(struct i915_gem_engines *e)
+{
+	__unpin_engines(e, e->num_engines);
+}
+
  static void __free_engines(struct i915_gem_engines *e, unsigned int count)
  {
  	while (count--) {
@@ -890,6 +1050,40 @@ static struct i915_gem_engines *default_engines(struct i915_gem_context *ctx,
  	return err;
  }
+static int perma_pin_contexts(struct intel_context *ce)
+{
+	struct intel_context *child;
+	int i = 0, j = 0, ret;
+
+	GEM_BUG_ON(!intel_context_is_parent(ce));
+
+	ret = intel_context_pin(ce);
+	if (unlikely(ret))
+		return ret;
+
+	for_each_child(ce, child) {
+		ret = intel_context_pin(child);
+		if (unlikely(ret))
+			goto unwind;
+		++i;
+	}
+
+	set_bit(CONTEXT_PERMA_PIN, &ce->flags);
+
+	return 0;
+
+unwind:
+	intel_context_unpin(ce);
+	for_each_child(ce, child) {
+		if (j++ < i)
+			intel_context_unpin(child);
+		else
+			break;
+	}
+
+	return ret;
+}
+
  static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
  					     unsigned int num_engines,
  					     struct i915_gem_proto_engine *pe)
@@ -903,7 +1097,7 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
  	e->num_engines = num_engines;
for (n = 0; n < num_engines; n++) {
-		struct intel_context *ce;
+		struct intel_context *ce, *child;
  		int ret;
switch (pe[n].type) {
@@ -913,7 +1107,13 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
case I915_GEM_ENGINE_TYPE_BALANCED:
  			ce = intel_engine_create_virtual(pe[n].siblings,
-							 pe[n].num_siblings);
+							 pe[n].num_siblings, 0);
+			break;
+
+		case I915_GEM_ENGINE_TYPE_PARALLEL:
+			ce = intel_engine_create_parallel(pe[n].siblings,
+							  pe[n].num_siblings,
+							  pe[n].width);
  			break;
case I915_GEM_ENGINE_TYPE_INVALID:
@@ -934,6 +1134,22 @@ static struct i915_gem_engines *user_engines(struct i915_gem_context *ctx,
  			err = ERR_PTR(ret);
  			goto free_engines;
  		}
+		for_each_child(ce, child) {
+			ret = intel_context_set_gem(child, ctx, pe->sseu);
+			if (ret) {
+				err = ERR_PTR(ret);
+				goto free_engines;
+			}
+		}
+
+		/* XXX: Must be done after setting gem context */
There is still no explanation of this comment either here or in the commit message. It needs to say why it is a problem that the perma-pin must be done after the above set_gem call. And what must be done to fix this problem. And what issues could be expected because of this problem.

+		if (pe[n].type == I915_GEM_ENGINE_TYPE_PARALLEL) {
+			ret = perma_pin_contexts(ce);
+			if (ret) {
+				err = ERR_PTR(ret);
+				goto free_engines;
+			}
+		}
  	}
return e;
@@ -1173,6 +1389,7 @@ static void context_close(struct i915_gem_context *ctx)
/* Flush any concurrent set_engines() */
  	mutex_lock(&ctx->engines_mutex);
+	unpin_engines(__context_engines_static(ctx));
  	engines_idle_release(ctx, rcu_replace_pointer(ctx->engines, NULL, 1));
  	i915_gem_context_set_closed(ctx);
  	mutex_unlock(&ctx->engines_mutex);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index c4617e4d9fa9..eb5f9b4f2d19 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -78,6 +78,9 @@ enum i915_gem_engine_type {
/** @I915_GEM_ENGINE_TYPE_BALANCED: A load-balanced engine set */
  	I915_GEM_ENGINE_TYPE_BALANCED,
+
+	/** @I915_GEM_ENGINE_TYPE_PARALLEL: A parallel engine set */
+	I915_GEM_ENGINE_TYPE_PARALLEL,
  };
/**
@@ -108,6 +111,9 @@ struct i915_gem_proto_engine {
  	/** @num_siblings: Number of balanced siblings */
Should this be updated to say 'number of balanced or parallel siblings'?

John.

  	unsigned int num_siblings;
+ /** @width: Width of each sibling */
+	unsigned int width;
+
  	/** @siblings: Balanced siblings */
  	struct intel_engine_cs **siblings;
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
index 8309d1141d0a..1d880303a7e4 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -55,9 +55,13 @@ struct intel_context_ops {
  	void (*reset)(struct intel_context *ce);
  	void (*destroy)(struct kref *kref);
- /* virtual engine/context interface */
+	/* virtual/parallel engine/context interface */
  	struct intel_context *(*create_virtual)(struct intel_engine_cs **engine,
-						unsigned int count);
+						unsigned int count,
+						unsigned long flags);
+	struct intel_context *(*create_parallel)(struct intel_engine_cs **engines,
+						 unsigned int num_siblings,
+						 unsigned int width);
  	struct intel_engine_cs *(*get_sibling)(struct intel_engine_cs *engine,
  					       unsigned int sibling);
  };
@@ -113,6 +117,7 @@ struct intel_context {
  #define CONTEXT_NOPREEMPT		8
  #define CONTEXT_LRCA_DIRTY		9
  #define CONTEXT_GUC_INIT		10
+#define CONTEXT_PERMA_PIN		11
struct {
  		u64 timeout_us;
diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 87579affb952..43f16a8347ee 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -279,9 +279,19 @@ intel_engine_has_preempt_reset(const struct intel_engine_cs *engine)
  	return intel_engine_has_preemption(engine);
  }
+#define FORCE_VIRTUAL BIT(0)
  struct intel_context *
  intel_engine_create_virtual(struct intel_engine_cs **siblings,
-			    unsigned int count);
+			    unsigned int count, unsigned long flags);
+
+static inline struct intel_context *
+intel_engine_create_parallel(struct intel_engine_cs **engines,
+			     unsigned int num_engines,
+			     unsigned int width)
+{
+	GEM_BUG_ON(!engines[0]->cops->create_parallel);
+	return engines[0]->cops->create_parallel(engines, num_engines, width);
+}
static inline bool
  intel_virtual_engine_has_heartbeat(const struct intel_engine_cs *engine)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 2eb798ad068b..ff6753ccb129 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -1953,16 +1953,16 @@ ktime_t intel_engine_get_busy_time(struct intel_engine_cs *engine, ktime_t *now)
struct intel_context *
  intel_engine_create_virtual(struct intel_engine_cs **siblings,
-			    unsigned int count)
+			    unsigned int count, unsigned long flags)
  {
  	if (count == 0)
  		return ERR_PTR(-EINVAL);
- if (count == 1)
+	if (count == 1 && !(flags & FORCE_VIRTUAL))
  		return intel_context_create(siblings[0]);
GEM_BUG_ON(!siblings[0]->cops->create_virtual);
-	return siblings[0]->cops->create_virtual(siblings, count);
+	return siblings[0]->cops->create_virtual(siblings, count, flags);
  }
struct i915_request *
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 5ed1e222c308..8d7f571029df 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -201,7 +201,8 @@ static struct virtual_engine *to_virtual_engine(struct intel_engine_cs *engine)
  }
static struct intel_context *
-execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count);
+execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+			 unsigned long flags);
static struct i915_request *
  __active_request(const struct intel_timeline * const tl,
@@ -3784,7 +3785,8 @@ static void virtual_submit_request(struct i915_request *rq)
  }
static struct intel_context *
-execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
+execlists_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+			 unsigned long flags)
  {
  	struct virtual_engine *ve;
  	unsigned int n;
diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
index b3863abc51f5..74986b094b96 100644
--- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
+++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
@@ -3733,7 +3733,7 @@ static int nop_virtual_engine(struct intel_gt *gt,
  	GEM_BUG_ON(!nctx || nctx > ARRAY_SIZE(ve));
for (n = 0; n < nctx; n++) {
-		ve[n] = intel_engine_create_virtual(siblings, nsibling);
+		ve[n] = intel_engine_create_virtual(siblings, nsibling, 0);
  		if (IS_ERR(ve[n])) {
  			err = PTR_ERR(ve[n]);
  			nctx = n;
@@ -3929,7 +3929,7 @@ static int mask_virtual_engine(struct intel_gt *gt,
  	 * restrict it to our desired engine within the virtual engine.
  	 */
- ve = intel_engine_create_virtual(siblings, nsibling);
+	ve = intel_engine_create_virtual(siblings, nsibling, 0);
  	if (IS_ERR(ve)) {
  		err = PTR_ERR(ve);
  		goto out_close;
@@ -4060,7 +4060,7 @@ static int slicein_virtual_engine(struct intel_gt *gt,
  		i915_request_add(rq);
  	}
- ce = intel_engine_create_virtual(siblings, nsibling);
+	ce = intel_engine_create_virtual(siblings, nsibling, 0);
  	if (IS_ERR(ce)) {
  		err = PTR_ERR(ce);
  		goto out;
@@ -4112,7 +4112,7 @@ static int sliceout_virtual_engine(struct intel_gt *gt,
/* XXX We do not handle oversubscription and fairness with normal rq */
  	for (n = 0; n < nsibling; n++) {
-		ce = intel_engine_create_virtual(siblings, nsibling);
+		ce = intel_engine_create_virtual(siblings, nsibling, 0);
  		if (IS_ERR(ce)) {
  			err = PTR_ERR(ce);
  			goto out;
@@ -4214,7 +4214,7 @@ static int preserved_virtual_engine(struct intel_gt *gt,
  	if (err)
  		goto out_scratch;
- ve = intel_engine_create_virtual(siblings, nsibling);
+	ve = intel_engine_create_virtual(siblings, nsibling, 0);
  	if (IS_ERR(ve)) {
  		err = PTR_ERR(ve);
  		goto out_scratch;
@@ -4354,7 +4354,7 @@ static int reset_virtual_engine(struct intel_gt *gt,
  	if (igt_spinner_init(&spin, gt))
  		return -ENOMEM;
- ve = intel_engine_create_virtual(siblings, nsibling);
+	ve = intel_engine_create_virtual(siblings, nsibling, 0);
  	if (IS_ERR(ve)) {
  		err = PTR_ERR(ve);
  		goto out_spin;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index f69e984683aa..9b19e0d830a2 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -124,7 +124,13 @@ struct guc_virtual_engine {
  };
static struct intel_context *
-guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count);
+guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+		   unsigned long flags);
+
+static struct intel_context *
+guc_create_parallel(struct intel_engine_cs **engines,
+		    unsigned int num_siblings,
+		    unsigned int width);
#define GUC_REQUEST_SIZE 64 /* bytes */ @@ -2611,6 +2617,7 @@ static const struct intel_context_ops guc_context_ops = {
  	.destroy = guc_context_destroy,
.create_virtual = guc_create_virtual,
+	.create_parallel = guc_create_parallel,
  };
static void submit_work_cb(struct irq_work *wrk)
@@ -2860,8 +2867,6 @@ static const struct intel_context_ops virtual_guc_context_ops = {
  	.get_sibling = guc_virtual_get_sibling,
  };
-/* Future patches will use this function */
-__maybe_unused
  static int guc_parent_context_pin(struct intel_context *ce, void *vaddr)
  {
  	struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);
@@ -2878,8 +2883,6 @@ static int guc_parent_context_pin(struct intel_context *ce, void *vaddr)
  	return __guc_context_pin(ce, engine, vaddr);
  }
-/* Future patches will use this function */
-__maybe_unused
  static int guc_child_context_pin(struct intel_context *ce, void *vaddr)
  {
  	struct intel_engine_cs *engine = guc_virtual_get_sibling(ce->engine, 0);
@@ -2891,8 +2894,6 @@ static int guc_child_context_pin(struct intel_context *ce, void *vaddr)
  	return __guc_context_pin(ce, engine, vaddr);
  }
-/* Future patches will use this function */
-__maybe_unused
  static void guc_parent_context_unpin(struct intel_context *ce)
  {
  	struct intel_guc *guc = ce_to_guc(ce);
@@ -2908,8 +2909,6 @@ static void guc_parent_context_unpin(struct intel_context *ce)
  	lrc_unpin(ce);
  }
-/* Future patches will use this function */
-__maybe_unused
  static void guc_child_context_unpin(struct intel_context *ce)
  {
  	GEM_BUG_ON(context_enabled(ce));
@@ -2920,8 +2919,6 @@ static void guc_child_context_unpin(struct intel_context *ce)
  	lrc_unpin(ce);
  }
-/* Future patches will use this function */
-__maybe_unused
  static void guc_child_context_post_unpin(struct intel_context *ce)
  {
  	GEM_BUG_ON(!intel_context_is_child(ce));
@@ -2932,6 +2929,98 @@ static void guc_child_context_post_unpin(struct intel_context *ce)
  	intel_context_unpin(ce->parallel.parent);
  }
+static void guc_child_context_destroy(struct kref *kref)
+{
+	struct intel_context *ce = container_of(kref, typeof(*ce), ref);
+
+	__guc_context_destroy(ce);
+}
+
+static const struct intel_context_ops virtual_parent_context_ops = {
+	.alloc = guc_virtual_context_alloc,
+
+	.pre_pin = guc_context_pre_pin,
+	.pin = guc_parent_context_pin,
+	.unpin = guc_parent_context_unpin,
+	.post_unpin = guc_context_post_unpin,
+
+	.ban = guc_context_ban,
+
+	.cancel_request = guc_context_cancel_request,
+
+	.enter = guc_virtual_context_enter,
+	.exit = guc_virtual_context_exit,
+
+	.sched_disable = guc_context_sched_disable,
+
+	.destroy = guc_context_destroy,
+
+	.get_sibling = guc_virtual_get_sibling,
+};
+
+static const struct intel_context_ops virtual_child_context_ops = {
+	.alloc = guc_virtual_context_alloc,
+
+	.pre_pin = guc_context_pre_pin,
+	.pin = guc_child_context_pin,
+	.unpin = guc_child_context_unpin,
+	.post_unpin = guc_child_context_post_unpin,
+
+	.cancel_request = guc_context_cancel_request,
+
+	.enter = guc_virtual_context_enter,
+	.exit = guc_virtual_context_exit,
+
+	.destroy = guc_child_context_destroy,
+
+	.get_sibling = guc_virtual_get_sibling,
+};
+
+static struct intel_context *
+guc_create_parallel(struct intel_engine_cs **engines,
+		    unsigned int num_siblings,
+		    unsigned int width)
+{
+	struct intel_engine_cs **siblings = NULL;
+	struct intel_context *parent = NULL, *ce, *err;
+	int i, j;
+
+	siblings = kmalloc_array(num_siblings,
+				 sizeof(*siblings),
+				 GFP_KERNEL);
+	if (!siblings)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < width; ++i) {
+		for (j = 0; j < num_siblings; ++j)
+			siblings[j] = engines[i * num_siblings + j];
+
+		ce = intel_engine_create_virtual(siblings, num_siblings,
+						 FORCE_VIRTUAL);
+		if (!ce) {
+			err = ERR_PTR(-ENOMEM);
+			goto unwind;
+		}
+
+		if (i == 0) {
+			parent = ce;
+			parent->ops = &virtual_parent_context_ops;
+		} else {
+			ce->ops = &virtual_child_context_ops;
+			intel_context_bind_parent_child(parent, ce);
+		}
+	}
+
+	kfree(siblings);
+	return parent;
+
+unwind:
+	if (parent)
+		intel_context_put(parent);
+	kfree(siblings);
+	return err;
+}
+
  static bool
  guc_irq_enable_breadcrumbs(struct intel_breadcrumbs *b)
  {
@@ -3759,7 +3848,8 @@ void intel_guc_submission_print_context_info(struct intel_guc *guc,
  }
static struct intel_context *
-guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count)
+guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count,
+		   unsigned long flags)
  {
  	struct guc_virtual_engine *ve;
  	struct intel_guc *guc;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index b1248a67b4f8..f7c19e5464ae 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1824,6 +1824,7 @@ struct drm_i915_gem_context_param {
   * Extensions:
   *   i915_context_engines_load_balance (I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE)
   *   i915_context_engines_bond (I915_CONTEXT_ENGINES_EXT_BOND)
+ *   i915_context_engines_parallel_submit (I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT)
   */
  #define I915_CONTEXT_PARAM_ENGINES	0xa
@@ -2049,6 +2050,135 @@ struct i915_context_engines_bond {
  	struct i915_engine_class_instance engines[N__]; \
  } __attribute__((packed)) name__
+/**
+ * struct i915_context_engines_parallel_submit - Configure engine for
+ * parallel submission.
+ *
+ * Setup a slot in the context engine map to allow multiple BBs to be submitted
+ * in a single execbuf IOCTL. Those BBs will then be scheduled to run on the GPU
+ * in parallel. Multiple hardware contexts are created internally in the i915 to
+ * run these BBs. Once a slot is configured for N BBs only N BBs can be
+ * submitted in each execbuf IOCTL and this is implicit behavior e.g. The user
+ * doesn't tell the execbuf IOCTL there are N BBs, the execbuf IOCTL knows how
+ * many BBs there are based on the slot's configuration. The N BBs are the last
+ * N buffer objects or first N if I915_EXEC_BATCH_FIRST is set.
+ *
+ * The default placement behavior is to create implicit bonds between each
+ * context if each context maps to more than 1 physical engine (e.g. context is
+ * a virtual engine). Also we only allow contexts of same engine class and these
+ * contexts must be in logically contiguous order. Examples of the placement
+ * behavior are described below. Lastly, the default is to not allow BBs to be
+ * preempted mid-batch. Rather insert coordinated preemption points on all
+ * hardware contexts between each set of BBs. Flags could be added in the future
+ * to change both of these default behaviors.
+ *
+ * Returns -EINVAL if hardware context placement configuration is invalid or if
+ * the placement configuration isn't supported on the platform / submission
+ * interface.
+ * Returns -ENODEV if extension isn't supported on the platform / submission
+ * interface.
+ *
+ * .. code-block:: none
+ *
+ *	Examples syntax:
+ *	CS[X] = generic engine of same class, logical instance X
+ *	INVALID = I915_ENGINE_CLASS_INVALID, I915_ENGINE_CLASS_INVALID_NONE
+ *
+ *	Example 1 pseudo code:
+ *	set_engines(INVALID)
+ *	set_parallel(engine_index=0, width=2, num_siblings=1,
+ *		     engines=CS[0],CS[1])
+ *
+ *	Results in the following valid placement:
+ *	CS[0], CS[1]
+ *
+ *	Example 2 pseudo code:
+ *	set_engines(INVALID)
+ *	set_parallel(engine_index=0, width=2, num_siblings=2,
+ *		     engines=CS[0],CS[2],CS[1],CS[3])
+ *
+ *	Results in the following valid placements:
+ *	CS[0], CS[1]
+ *	CS[2], CS[3]
+ *
+ *	This can be thought of as two virtual engines, each containing two
+ *	engines thereby making a 2D array. However, there are bonds tying the
+ *	entries together and placing restrictions on how they can be scheduled.
+ *	Specifically, the scheduler can choose only vertical columns from the 2D
+ *	array. That is, CS[0] is bonded to CS[1] and CS[2] to CS[3]. So if the
+ *	scheduler wants to submit to CS[0], it must also choose CS[1] and vice
+ *	versa. Same for CS[2] requires also using CS[3].
+ *	VE[0] = CS[0], CS[2]
+ *	VE[1] = CS[1], CS[3]
+ *
+ *	Example 3 pseudo code:
+ *	set_engines(INVALID)
+ *	set_parallel(engine_index=0, width=2, num_siblings=2,
+ *		     engines=CS[0],CS[1],CS[1],CS[3])
+ *
+ *	Results in the following valid and invalid placements:
+ *	CS[0], CS[1]
+ *	CS[1], CS[3] - Not logically contiguous, return -EINVAL
+ */
+struct i915_context_engines_parallel_submit {
+	/**
+	 * @base: base user extension.
+	 */
+	struct i915_user_extension base;
+
+	/**
+	 * @engine_index: slot for parallel engine
+	 */
+	__u16 engine_index;
+
+	/**
+	 * @width: number of contexts per parallel engine or in other words the
+	 * number of batches in each submission
+	 */
+	__u16 width;
+
+	/**
+	 * @num_siblings: number of siblings per context or in other words the
+	 * number of possible placements for each submission
+	 */
+	__u16 num_siblings;
+
+	/**
+	 * @mbz16: reserved for future use; must be zero
+	 */
+	__u16 mbz16;
+
+	/**
+	 * @flags: all undefined flags must be zero, currently not defined flags
+	 */
+	__u64 flags;
+
+	/**
+	 * @mbz64: reserved for future use; must be zero
+	 */
+	__u64 mbz64[3];
+
+	/**
+	 * @engines: 2-d array of engine instances to configure parallel engine
+	 *
+	 * length = width (i) * num_siblings (j)
+	 * index = j + i * num_siblings
+	 */
+	struct i915_engine_class_instance engines[0];
+
+} __packed;
+
+#define I915_DEFINE_CONTEXT_ENGINES_PARALLEL_SUBMIT(name__, N__) struct { \
+	struct i915_user_extension base; \
+	__u16 engine_index; \
+	__u16 width; \
+	__u16 num_siblings; \
+	__u16 mbz16; \
+	__u64 flags; \
+	__u64 mbz64[3]; \
+	struct i915_engine_class_instance engines[N__]; \
+} __attribute__((packed)) name__
+
  /**
   * DOC: Context Engine Map uAPI
   *
@@ -2108,6 +2238,7 @@ struct i915_context_param_engines {
  	__u64 extensions; /* linked chain of extension blocks, 0 terminates */
  #define I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE 0 /* see i915_context_engines_load_balance */
  #define I915_CONTEXT_ENGINES_EXT_BOND 1 /* see i915_context_engines_bond */
+#define I915_CONTEXT_ENGINES_EXT_PARALLEL_SUBMIT 2 /* see i915_context_engines_parallel_submit */
  	struct i915_engine_class_instance engines[0];
  } __attribute__((packed));




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