1 files changed, 578 insertions, 245 deletions

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 1aa249908b64..4d7da07442f2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -21,6 +21,8 @@
 #include "gt/intel_gt_pm.h"
 #include "gt/intel_ring.h"
 
+#include "pxp/intel_pxp.h"
+
 #include "i915_drv.h"
 #include "i915_gem_clflush.h"
 #include "i915_gem_context.h"
@@ -244,17 +246,25 @@ struct i915_execbuffer {
 	struct drm_i915_gem_exec_object2 *exec; /** ioctl execobj[] */
 	struct eb_vma *vma;
 
-	struct intel_engine_cs *engine; /** engine to queue the request to */
+	struct intel_gt *gt; /* gt for the execbuf */
 	struct intel_context *context; /* logical state for the request */
 	struct i915_gem_context *gem_context; /** caller's context */
 
-	struct i915_request *request; /** our request to build */
-	struct eb_vma *batch; /** identity of the batch obj/vma */
+	/** our requests to build */
+	struct i915_request *requests[MAX_ENGINE_INSTANCE + 1];
+	/** identity of the batch obj/vma */
+	struct eb_vma *batches[MAX_ENGINE_INSTANCE + 1];
 	struct i915_vma *trampoline; /** trampoline used for chaining */
 
+	/** used for excl fence in dma_resv objects when > 1 BB submitted */
+	struct dma_fence *composite_fence;
+
 	/** actual size of execobj[] as we may extend it for the cmdparser */
 	unsigned int buffer_count;
 
+	/* number of batches in execbuf IOCTL */
+	unsigned int num_batches;
+
 	/** list of vma not yet bound during reservation phase */
 	struct list_head unbound;
 
@@ -281,7 +291,8 @@ struct i915_execbuffer {
 
 	u64 invalid_flags; /** Set of execobj.flags that are invalid */
 
-	u64 batch_len; /** Length of batch within object */
+	/** Length of batch within object */
+	u64 batch_len[MAX_ENGINE_INSTANCE + 1];
 	u32 batch_start_offset; /** Location within object of batch */
 	u32 batch_flags; /** Flags composed for emit_bb_start() */
 	struct intel_gt_buffer_pool_node *batch_pool; /** pool node for batch buffer */
@@ -299,14 +310,13 @@ struct i915_execbuffer {
 };
 
 static int eb_parse(struct i915_execbuffer *eb);
-static struct i915_request *eb_pin_engine(struct i915_execbuffer *eb,
-					  bool throttle);
+static int eb_pin_engine(struct i915_execbuffer *eb, bool throttle);
 static void eb_unpin_engine(struct i915_execbuffer *eb);
 
 static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
 {
-	return intel_engine_requires_cmd_parser(eb->engine) ||
-		(intel_engine_using_cmd_parser(eb->engine) &&
+	return intel_engine_requires_cmd_parser(eb->context->engine) ||
+		(intel_engine_using_cmd_parser(eb->context->engine) &&
 		 eb->args->batch_len);
 }
 
@@ -533,11 +543,21 @@ eb_validate_vma(struct i915_execbuffer *eb,
 	return 0;
 }
 
-static void
+static inline bool
+is_batch_buffer(struct i915_execbuffer *eb, unsigned int buffer_idx)
+{
+	return eb->args->flags & I915_EXEC_BATCH_FIRST ?
+		buffer_idx < eb->num_batches :
+		buffer_idx >= eb->args->buffer_count - eb->num_batches;
+}
+
+static int
 eb_add_vma(struct i915_execbuffer *eb,
-	   unsigned int i, unsigned batch_idx,
+	   unsigned int *current_batch,
+	   unsigned int i,
 	   struct i915_vma *vma)
 {
+	struct drm_i915_private *i915 = eb->i915;
 	struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
 	struct eb_vma *ev = &eb->vma[i];
 
@@ -564,15 +584,43 @@ eb_add_vma(struct i915_execbuffer *eb,
 	 * Note that actual hangs have only been observed on gen7, but for
 	 * paranoia do it everywhere.
 	 */
-	if (i == batch_idx) {
+	if (is_batch_buffer(eb, i)) {
 		if (entry->relocation_count &&
 		    !(ev->flags & EXEC_OBJECT_PINNED))
 			ev->flags |= __EXEC_OBJECT_NEEDS_BIAS;
 		if (eb->reloc_cache.has_fence)
 			ev->flags |= EXEC_OBJECT_NEEDS_FENCE;
 
-		eb->batch = ev;
+		eb->batches[*current_batch] = ev;
+
+		if (unlikely(ev->flags & EXEC_OBJECT_WRITE)) {
+			drm_dbg(&i915->drm,
+				"Attempting to use self-modifying batch buffer\n");
+			return -EINVAL;
+		}
+
+		if (range_overflows_t(u64,
+				      eb->batch_start_offset,
+				      eb->args->batch_len,
+				      ev->vma->size)) {
+			drm_dbg(&i915->drm, "Attempting to use out-of-bounds batch\n");
+			return -EINVAL;
+		}
+
+		if (eb->args->batch_len == 0)
+			eb->batch_len[*current_batch] = ev->vma->size -
+				eb->batch_start_offset;
+		else
+			eb->batch_len[*current_batch] = eb->args->batch_len;
+		if (unlikely(eb->batch_len[*current_batch] == 0)) { /* impossible! */
+			drm_dbg(&i915->drm, "Invalid batch length\n");
+			return -EINVAL;
+		}
+
+		++*current_batch;
 	}
+
+	return 0;
 }
 
 static inline int use_cpu_reloc(const struct reloc_cache *cache,
@@ -716,14 +764,6 @@ static int eb_reserve(struct i915_execbuffer *eb)
 	} while (1);
 }
 
-static unsigned int eb_batch_index(const struct i915_execbuffer *eb)
-{
-	if (eb->args->flags & I915_EXEC_BATCH_FIRST)
-		return 0;
-	else
-		return eb->buffer_count - 1;
-}
-
 static int eb_select_context(struct i915_execbuffer *eb)
 {
 	struct i915_gem_context *ctx;
@@ -733,7 +773,7 @@ static int eb_select_context(struct i915_execbuffer *eb)
 		return PTR_ERR(ctx);
 
 	eb->gem_context = ctx;
-	if (rcu_access_pointer(ctx->vm))
+	if (i915_gem_context_has_full_ppgtt(ctx))
 		eb->invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
 
 	return 0;
@@ -759,11 +799,7 @@ static int __eb_add_lut(struct i915_execbuffer *eb,
 	/* Check that the context hasn't been closed in the meantime */
 	err = -EINTR;
 	if (!mutex_lock_interruptible(&ctx->lut_mutex)) {
-		struct i915_address_space *vm = rcu_access_pointer(ctx->vm);
-
-		if (unlikely(vm && vma->vm != vm))
-			err = -EAGAIN; /* user racing with ctx set-vm */
-		else if (likely(!i915_gem_context_is_closed(ctx)))
+		if (likely(!i915_gem_context_is_closed(ctx)))
 			err = radix_tree_insert(&ctx->handles_vma, handle, vma);
 		else
 			err = -ENOENT;
@@ -814,6 +850,22 @@ static struct i915_vma *eb_lookup_vma(struct i915_execbuffer *eb, u32 handle)
 		if (unlikely(!obj))
 			return ERR_PTR(-ENOENT);
 
+		/*
+		 * If the user has opted-in for protected-object tracking, make
+		 * sure the object encryption can be used.
+		 * We only need to do this when the object is first used with
+		 * this context, because the context itself will be banned when
+		 * the protected objects become invalid.
+		 */
+		if (i915_gem_context_uses_protected_content(eb->gem_context) &&
+		    i915_gem_object_is_protected(obj)) {
+			err = intel_pxp_key_check(&vm->gt->pxp, obj, true);
+			if (err) {
+				i915_gem_object_put(obj);
+				return ERR_PTR(err);
+			}
+		}
+
 		vma = i915_vma_instance(obj, vm, NULL);
 		if (IS_ERR(vma)) {
 			i915_gem_object_put(obj);
@@ -832,9 +884,7 @@ static struct i915_vma *eb_lookup_vma(struct i915_execbuffer *eb, u32 handle)
 
 static int eb_lookup_vmas(struct i915_execbuffer *eb)
 {
-	struct drm_i915_private *i915 = eb->i915;
-	unsigned int batch = eb_batch_index(eb);
-	unsigned int i;
+	unsigned int i, current_batch = 0;
 	int err = 0;
 
 	INIT_LIST_HEAD(&eb->relocs);
@@ -854,7 +904,9 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
 			goto err;
 		}
 
-		eb_add_vma(eb, i, batch, vma);
+		err = eb_add_vma(eb, &current_batch, i, vma);
+		if (err)
+			return err;
 
 		if (i915_gem_object_is_userptr(vma->obj)) {
 			err = i915_gem_object_userptr_submit_init(vma->obj);
@@ -877,26 +929,6 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
 		}
 	}
 
-	if (unlikely(eb->batch->flags & EXEC_OBJECT_WRITE)) {
-		drm_dbg(&i915->drm,
-			"Attempting to use self-modifying batch buffer\n");
-		return -EINVAL;
-	}
-
-	if (range_overflows_t(u64,
-			      eb->batch_start_offset, eb->batch_len,
-			      eb->batch->vma->size)) {
-		drm_dbg(&i915->drm, "Attempting to use out-of-bounds batch\n");
-		return -EINVAL;
-	}
-
-	if (eb->batch_len == 0)
-		eb->batch_len = eb->batch->vma->size - eb->batch_start_offset;
-	if (unlikely(eb->batch_len == 0)) { /* impossible! */
-		drm_dbg(&i915->drm, "Invalid batch length\n");
-		return -EINVAL;
-	}
-
 	return 0;
 
 err:
@@ -1629,8 +1661,7 @@ static int eb_reinit_userptr(struct i915_execbuffer *eb)
 	return 0;
 }
 
-static noinline int eb_relocate_parse_slow(struct i915_execbuffer *eb,
-					   struct i915_request *rq)
+static noinline int eb_relocate_parse_slow(struct i915_execbuffer *eb)
 {
 	bool have_copy = false;
 	struct eb_vma *ev;
@@ -1646,21 +1677,6 @@ repeat:
 	eb_release_vmas(eb, false);
 	i915_gem_ww_ctx_fini(&eb->ww);
 
-	if (rq) {
-		/* nonblocking is always false */
-		if (i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE,
-				      MAX_SCHEDULE_TIMEOUT) < 0) {
-			i915_request_put(rq);
-			rq = NULL;
-
-			err = -EINTR;
-			goto err_relock;
-		}
-
-		i915_request_put(rq);
-		rq = NULL;
-	}
-
 	/*
 	 * We take 3 passes through the slowpatch.
 	 *
@@ -1687,28 +1703,21 @@ repeat:
 	if (!err)
 		err = eb_reinit_userptr(eb);
 
-err_relock:
 	i915_gem_ww_ctx_init(&eb->ww, true);
 	if (err)
 		goto out;
 
 	/* reacquire the objects */
 repeat_validate:
-	rq = eb_pin_engine(eb, false);
-	if (IS_ERR(rq)) {
-		err = PTR_ERR(rq);
-		rq = NULL;
+	err = eb_pin_engine(eb, false);
+	if (err)
 		goto err;
-	}
-
-	/* We didn't throttle, should be NULL */
-	GEM_WARN_ON(rq);
 
 	err = eb_validate_vmas(eb);
 	if (err)
 		goto err;
 
-	GEM_BUG_ON(!eb->batch);
+	GEM_BUG_ON(!eb->batches[0]);
 
 	list_for_each_entry(ev, &eb->relocs, reloc_link) {
 		if (!have_copy) {
@@ -1772,46 +1781,23 @@ out:
 		}
 	}
 
-	if (rq)
-		i915_request_put(rq);
-
 	return err;
 }
 
 static int eb_relocate_parse(struct i915_execbuffer *eb)
 {
 	int err;
-	struct i915_request *rq = NULL;
 	bool throttle = true;
 
 retry:
-	rq = eb_pin_engine(eb, throttle);
-	if (IS_ERR(rq)) {
-		err = PTR_ERR(rq);
-		rq = NULL;
+	err = eb_pin_engine(eb, throttle);
+	if (err) {
 		if (err != -EDEADLK)
 			return err;
 
 		goto err;
 	}
 
-	if (rq) {
-		bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
-
-		/* Need to drop all locks now for throttling, take slowpath */
-		err = i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE, 0);
-		if (err == -ETIME) {
-			if (nonblock) {
-				err = -EWOULDBLOCK;
-				i915_request_put(rq);
-				goto err;
-			}
-			goto slow;
-		}
-		i915_request_put(rq);
-		rq = NULL;
-	}
-
 	/* only throttle once, even if we didn't need to throttle */
 	throttle = false;
 
@@ -1851,7 +1837,7 @@ err:
 	return err;
 
 slow:
-	err = eb_relocate_parse_slow(eb, rq);
+	err = eb_relocate_parse_slow(eb);
 	if (err)
 		/*
 		 * If the user expects the execobject.offset and
@@ -1865,11 +1851,40 @@ slow:
 	return err;
 }
 
+/*
+ * Using two helper loops for the order of which requests / batches are created
+ * and added the to backend. Requests are created in order from the parent to
+ * the last child. Requests are added in the reverse order, from the last child
+ * to parent. This is done for locking reasons as the timeline lock is acquired
+ * during request creation and released when the request is added to the
+ * backend. To make lockdep happy (see intel_context_timeline_lock) this must be
+ * the ordering.
+ */
+#define for_each_batch_create_order(_eb, _i) \
+	for ((_i) = 0; (_i) < (_eb)->num_batches; ++(_i))
+#define for_each_batch_add_order(_eb, _i) \
+	BUILD_BUG_ON(!typecheck(int, _i)); \
+	for ((_i) = (_eb)->num_batches - 1; (_i) >= 0; --(_i))
+
+static struct i915_request *
+eb_find_first_request_added(struct i915_execbuffer *eb)
+{
+	int i;
+
+	for_each_batch_add_order(eb, i)
+		if (eb->requests[i])
+			return eb->requests[i];
+
+	GEM_BUG_ON("Request not found");
+
+	return NULL;
+}
+
 static int eb_move_to_gpu(struct i915_execbuffer *eb)
 {
 	const unsigned int count = eb->buffer_count;
 	unsigned int i = count;
-	int err = 0;
+	int err = 0, j;
 
 	while (i--) {
 		struct eb_vma *ev = &eb->vma[i];
@@ -1882,11 +1897,17 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
 		if (flags & EXEC_OBJECT_CAPTURE) {
 			struct i915_capture_list *capture;
 
-			capture = kmalloc(sizeof(*capture), GFP_KERNEL);
-			if (capture) {
-				capture->next = eb->request->capture_list;
-				capture->vma = vma;
-				eb->request->capture_list = capture;
+			for_each_batch_create_order(eb, j) {
+				if (!eb->requests[j])
+					break;
+
+				capture = kmalloc(sizeof(*capture), GFP_KERNEL);
+				if (capture) {
+					capture->next =
+						eb->requests[j]->capture_list;
+					capture->vma = vma;
+					eb->requests[j]->capture_list = capture;
+				}
 			}
 		}
 
@@ -1901,20 +1922,43 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
 		 *   !(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ)
 		 * but gcc's optimiser doesn't handle that as well and emits
 		 * two jumps instead of one. Maybe one day...
+		 *
+		 * FIXME: There is also sync flushing in set_pages(), which
+		 * serves a different purpose(some of the time at least).
+		 *
+		 * We should consider:
+		 *
+		 *   1. Rip out the async flush code.
+		 *
+		 *   2. Or make the sync flushing use the async clflush path
+		 *   using mandatory fences underneath. Currently the below
+		 *   async flush happens after we bind the object.
 		 */
 		if (unlikely(obj->cache_dirty & ~obj->cache_coherent)) {
 			if (i915_gem_clflush_object(obj, 0))
 				flags &= ~EXEC_OBJECT_ASYNC;
 		}
 
+		/* We only need to await on the first request */
 		if (err == 0 && !(flags & EXEC_OBJECT_ASYNC)) {
 			err = i915_request_await_object
-				(eb->request, obj, flags & EXEC_OBJECT_WRITE);
+				(eb_find_first_request_added(eb), obj,
+				 flags & EXEC_OBJECT_WRITE);
 		}
 
-		if (err == 0)
-			err = i915_vma_move_to_active(vma, eb->request,
-						      flags | __EXEC_OBJECT_NO_RESERVE);
+		for_each_batch_add_order(eb, j) {
+			if (err)
+				break;
+			if (!eb->requests[j])
+				continue;
+
+			err = _i915_vma_move_to_active(vma, eb->requests[j],
+						       j ? NULL :
+						       eb->composite_fence ?
+						       eb->composite_fence :
+						       &eb->requests[j]->fence,
+						       flags | __EXEC_OBJECT_NO_RESERVE);
+		}
 	}
 
 #ifdef CONFIG_MMU_NOTIFIER
@@ -1945,11 +1989,16 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
 		goto err_skip;
 
 	/* Unconditionally flush any chipset caches (for streaming writes). */
-	intel_gt_chipset_flush(eb->engine->gt);
+	intel_gt_chipset_flush(eb->gt);
 	return 0;
 
 err_skip:
-	i915_request_set_error_once(eb->request, err);
+	for_each_batch_create_order(eb, j) {
+		if (!eb->requests[j])
+			break;
+
+		i915_request_set_error_once(eb->requests[j], err);
+	}
 	return err;
 }
 
@@ -2044,14 +2093,17 @@ static int eb_parse(struct i915_execbuffer *eb)
 	int err;
 
 	if (!eb_use_cmdparser(eb)) {
-		batch = eb_dispatch_secure(eb, eb->batch->vma);
+		batch = eb_dispatch_secure(eb, eb->batches[0]->vma);
 		if (IS_ERR(batch))
 			return PTR_ERR(batch);
 
 		goto secure_batch;
 	}
 
-	len = eb->batch_len;
+	if (intel_context_is_parallel(eb->context))
+		return -EINVAL;
+
+	len = eb->batch_len[0];
 	if (!CMDPARSER_USES_GGTT(eb->i915)) {
 		/*
 		 * ppGTT backed shadow buffers must be mapped RO, to prevent
@@ -2065,11 +2117,11 @@ static int eb_parse(struct i915_execbuffer *eb)
 	} else {
 		len += I915_CMD_PARSER_TRAMPOLINE_SIZE;
 	}
-	if (unlikely(len < eb->batch_len)) /* last paranoid check of overflow */
+	if (unlikely(len < eb->batch_len[0])) /* last paranoid check of overflow */
 		return -EINVAL;
 
 	if (!pool) {
-		pool = intel_gt_get_buffer_pool(eb->engine->gt, len,
+		pool = intel_gt_get_buffer_pool(eb->gt, len,
 						I915_MAP_WB);
 		if (IS_ERR(pool))
 			return PTR_ERR(pool);
@@ -2094,7 +2146,7 @@ static int eb_parse(struct i915_execbuffer *eb)
 		trampoline = shadow;
 
 		shadow = shadow_batch_pin(eb, pool->obj,
-					  &eb->engine->gt->ggtt->vm,
+					  &eb->gt->ggtt->vm,
 					  PIN_GLOBAL);
 		if (IS_ERR(shadow)) {
 			err = PTR_ERR(shadow);
@@ -2116,26 +2168,29 @@ static int eb_parse(struct i915_execbuffer *eb)
 	if (err)
 		goto err_trampoline;
 
-	err = intel_engine_cmd_parser(eb->engine,
-				      eb->batch->vma,
+	err = intel_engine_cmd_parser(eb->context->engine,
+				      eb->batches[0]->vma,
 				      eb->batch_start_offset,
-				      eb->batch_len,
+				      eb->batch_len[0],
 				      shadow, trampoline);
 	if (err)
 		goto err_unpin_batch;
 
-	eb->batch = &eb->vma[eb->buffer_count++];
-	eb->batch->vma = i915_vma_get(shadow);
-	eb->batch->flags = __EXEC_OBJECT_HAS_PIN;
+	eb->batches[0] = &eb->vma[eb->buffer_count++];
+	eb->batches[0]->vma = i915_vma_get(shadow);
+	eb->batches[0]->flags = __EXEC_OBJECT_HAS_PIN;
 
 	eb->trampoline = trampoline;
 	eb->batch_start_offset = 0;
 
 secure_batch:
 	if (batch) {
-		eb->batch = &eb->vma[eb->buffer_count++];
-		eb->batch->flags = __EXEC_OBJECT_HAS_PIN;
-		eb->batch->vma = i915_vma_get(batch);
+		if (intel_context_is_parallel(eb->context))
+			return -EINVAL;
+
+		eb->batches[0] = &eb->vma[eb->buffer_count++];
+		eb->batches[0]->flags = __EXEC_OBJECT_HAS_PIN;
+		eb->batches[0]->vma = i915_vma_get(batch);
 	}
 	return 0;
 
@@ -2151,19 +2206,18 @@ err:
 	return err;
 }
 
-static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch)
+static int eb_request_submit(struct i915_execbuffer *eb,
+			     struct i915_request *rq,
+			     struct i915_vma *batch,
+			     u64 batch_len)
 {
 	int err;
 
-	if (intel_context_nopreempt(eb->context))
-		__set_bit(I915_FENCE_FLAG_NOPREEMPT, &eb->request->fence.flags);
-
-	err = eb_move_to_gpu(eb);
-	if (err)
-		return err;
+	if (intel_context_nopreempt(rq->context))
+		__set_bit(I915_FENCE_FLAG_NOPREEMPT, &rq->fence.flags);
 
 	if (eb->args->flags & I915_EXEC_GEN7_SOL_RESET) {
-		err = i915_reset_gen7_sol_offsets(eb->request);
+		err = i915_reset_gen7_sol_offsets(rq);
 		if (err)
 			return err;
 	}
@@ -2174,26 +2228,26 @@ static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch)
 	 * allows us to determine if the batch is still waiting on the GPU
 	 * or actually running by checking the breadcrumb.
 	 */
-	if (eb->engine->emit_init_breadcrumb) {
-		err = eb->engine->emit_init_breadcrumb(eb->request);
+	if (rq->context->engine->emit_init_breadcrumb) {
+		err = rq->context->engine->emit_init_breadcrumb(rq);
 		if (err)
 			return err;
 	}
 
-	err = eb->engine->emit_bb_start(eb->request,
-					batch->node.start +
-					eb->batch_start_offset,
-					eb->batch_len,
-					eb->batch_flags);
+	err = rq->context->engine->emit_bb_start(rq,
+						 batch->node.start +
+						 eb->batch_start_offset,
+						 batch_len,
+						 eb->batch_flags);
 	if (err)
 		return err;
 
 	if (eb->trampoline) {
+		GEM_BUG_ON(intel_context_is_parallel(rq->context));
 		GEM_BUG_ON(eb->batch_start_offset);
-		err = eb->engine->emit_bb_start(eb->request,
-						eb->trampoline->node.start +
-						eb->batch_len,
-						0, 0);
+		err = rq->context->engine->emit_bb_start(rq,
+							 eb->trampoline->node.start +
+							 batch_len, 0, 0);
 		if (err)
 			return err;
 	}
@@ -2201,6 +2255,27 @@ static int eb_submit(struct i915_execbuffer *eb, struct i915_vma *batch)
 	return 0;
 }
 
+static int eb_submit(struct i915_execbuffer *eb)
+{
+	unsigned int i;
+	int err;
+
+	err = eb_move_to_gpu(eb);
+
+	for_each_batch_create_order(eb, i) {
+		if (!eb->requests[i])
+			break;
+
+		trace_i915_request_queue(eb->requests[i], eb->batch_flags);
+		if (!err)
+			err = eb_request_submit(eb, eb->requests[i],
+						eb->batches[i]->vma,
+						eb->batch_len[i]);
+	}
+
+	return err;
+}
+
 static int num_vcs_engines(const struct drm_i915_private *i915)
 {
 	return hweight_long(VDBOX_MASK(&i915->gt));
@@ -2266,26 +2341,11 @@ static struct i915_request *eb_throttle(struct i915_execbuffer *eb, struct intel
 	return i915_request_get(rq);
 }
 
-static struct i915_request *eb_pin_engine(struct i915_execbuffer *eb, bool throttle)
+static int eb_pin_timeline(struct i915_execbuffer *eb, struct intel_context *ce,
+			   bool throttle)
 {
-	struct intel_context *ce = eb->context;
 	struct intel_timeline *tl;
 	struct i915_request *rq = NULL;
-	int err;
-
-	GEM_BUG_ON(eb->args->flags & __EXEC_ENGINE_PINNED);
-
-	if (unlikely(intel_context_is_banned(ce)))
-		return ERR_PTR(-EIO);
-
-	/*
-	 * Pinning the contexts may generate requests in order to acquire
-	 * GGTT space, so do this first before we reserve a seqno for
-	 * ourselves.
-	 */
-	err = intel_context_pin_ww(ce, &eb->ww);
-	if (err)
-		return ERR_PTR(err);
 
 	/*
 	 * Take a local wakeref for preparing to dispatch the execbuf as
@@ -2296,33 +2356,108 @@ static struct i915_request *eb_pin_engine(struct i915_execbuffer *eb, bool throt
 	 * taken on the engine, and the parent device.
 	 */
 	tl = intel_context_timeline_lock(ce);
-	if (IS_ERR(tl)) {
-		intel_context_unpin(ce);
-		return ERR_CAST(tl);
-	}
+	if (IS_ERR(tl))
+		return PTR_ERR(tl);
 
 	intel_context_enter(ce);
 	if (throttle)
 		rq = eb_throttle(eb, ce);
 	intel_context_timeline_unlock(tl);
 
+	if (rq) {
+		bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
+		long timeout = nonblock ? 0 : MAX_SCHEDULE_TIMEOUT;
+
+		if (i915_request_wait(rq, I915_WAIT_INTERRUPTIBLE,
+				      timeout) < 0) {
+			i915_request_put(rq);
+
+			tl = intel_context_timeline_lock(ce);
+			intel_context_exit(ce);
+			intel_context_timeline_unlock(tl);
+
+			if (nonblock)
+				return -EWOULDBLOCK;
+			else
+				return -EINTR;
+		}
+		i915_request_put(rq);
+	}
+
+	return 0;
+}
+
+static int eb_pin_engine(struct i915_execbuffer *eb, bool throttle)
+{
+	struct intel_context *ce = eb->context, *child;
+	int err;
+	int i = 0, j = 0;
+
+	GEM_BUG_ON(eb->args->flags & __EXEC_ENGINE_PINNED);
+
+	if (unlikely(intel_context_is_banned(ce)))
+		return -EIO;
+
+	/*
+	 * Pinning the contexts may generate requests in order to acquire
+	 * GGTT space, so do this first before we reserve a seqno for
+	 * ourselves.
+	 */
+	err = intel_context_pin_ww(ce, &eb->ww);
+	if (err)
+		return err;
+	for_each_child(ce, child) {
+		err = intel_context_pin_ww(child, &eb->ww);
+		GEM_BUG_ON(err);	/* perma-pinned should incr a counter */
+	}
+
+	for_each_child(ce, child) {
+		err = eb_pin_timeline(eb, child, throttle);
+		if (err)
+			goto unwind;
+		++i;
+	}
+	err = eb_pin_timeline(eb, ce, throttle);
+	if (err)
+		goto unwind;
+
 	eb->args->flags |= __EXEC_ENGINE_PINNED;
-	return rq;
+	return 0;
+
+unwind:
+	for_each_child(ce, child) {
+		if (j++ < i) {
+			mutex_lock(&child->timeline->mutex);
+			intel_context_exit(child);
+			mutex_unlock(&child->timeline->mutex);
+		}
+	}
+	for_each_child(ce, child)
+		intel_context_unpin(child);
+	intel_context_unpin(ce);
+	return err;
 }
 
 static void eb_unpin_engine(struct i915_execbuffer *eb)
 {
-	struct intel_context *ce = eb->context;
-	struct intel_timeline *tl = ce->timeline;
+	struct intel_context *ce = eb->context, *child;
 
 	if (!(eb->args->flags & __EXEC_ENGINE_PINNED))
 		return;
 
 	eb->args->flags &= ~__EXEC_ENGINE_PINNED;
 
-	mutex_lock(&tl->mutex);
+	for_each_child(ce, child) {
+		mutex_lock(&child->timeline->mutex);
+		intel_context_exit(child);
+		mutex_unlock(&child->timeline->mutex);
+
+		intel_context_unpin(child);
+	}
+
+	mutex_lock(&ce->timeline->mutex);
 	intel_context_exit(ce);
-	mutex_unlock(&tl->mutex);
+	mutex_unlock(&ce->timeline->mutex);
 
 	intel_context_unpin(ce);
 }
@@ -2373,7 +2508,7 @@ eb_select_legacy_ring(struct i915_execbuffer *eb)
 static int
 eb_select_engine(struct i915_execbuffer *eb)
 {
-	struct intel_context *ce;
+	struct intel_context *ce, *child;
 	unsigned int idx;
 	int err;
 
@@ -2386,6 +2521,20 @@ eb_select_engine(struct i915_execbuffer *eb)
 	if (IS_ERR(ce))
 		return PTR_ERR(ce);
 
+	if (intel_context_is_parallel(ce)) {
+		if (eb->buffer_count < ce->parallel.number_children + 1) {
+			intel_context_put(ce);
+			return -EINVAL;
+		}
+		if (eb->batch_start_offset || eb->args->batch_len) {
+			intel_context_put(ce);
+			return -EINVAL;
+		}
+	}
+	eb->num_batches = ce->parallel.number_children + 1;
+
+	for_each_child(ce, child)
+		intel_context_get(child);
 	intel_gt_pm_get(ce->engine->gt);
 
 	if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
@@ -2393,6 +2542,13 @@ eb_select_engine(struct i915_execbuffer *eb)
 		if (err)
 			goto err;
 	}
+	for_each_child(ce, child) {
+		if (!test_bit(CONTEXT_ALLOC_BIT, &child->flags)) {
+			err = intel_context_alloc_state(child);
+			if (err)
+				goto err;
+		}
+	}
 
 	/*
 	 * ABI: Before userspace accesses the GPU (e.g. execbuffer), report
@@ -2403,7 +2559,7 @@ eb_select_engine(struct i915_execbuffer *eb)
 		goto err;
 
 	eb->context = ce;
-	eb->engine = ce->engine;
+	eb->gt = ce->engine->gt;
 
 	/*
 	 * Make sure engine pool stays alive even if we call intel_context_put
@@ -2414,6 +2570,8 @@ eb_select_engine(struct i915_execbuffer *eb)
 
 err:
 	intel_gt_pm_put(ce->engine->gt);
+	for_each_child(ce, child)
+		intel_context_put(child);
 	intel_context_put(ce);
 	return err;
 }
@@ -2421,7 +2579,11 @@ err:
 static void
 eb_put_engine(struct i915_execbuffer *eb)
 {
-	intel_gt_pm_put(eb->engine->gt);
+	struct intel_context *child;
+
+	intel_gt_pm_put(eb->gt);
+	for_each_child(eb->context, child)
+		intel_context_put(child);
 	intel_context_put(eb->context);
 }
 
@@ -2644,7 +2806,8 @@ static void put_fence_array(struct eb_fence *fences, int num_fences)
 }
 
 static int
-await_fence_array(struct i915_execbuffer *eb)
+await_fence_array(struct i915_execbuffer *eb,
+		  struct i915_request *rq)
 {
 	unsigned int n;
 	int err;
@@ -2658,8 +2821,7 @@ await_fence_array(struct i915_execbuffer *eb)
 		if (!eb->fences[n].dma_fence)
 			continue;
 
-		err = i915_request_await_dma_fence(eb->request,
-						   eb->fences[n].dma_fence);
+		err = i915_request_await_dma_fence(rq, eb->fences[n].dma_fence);
 		if (err < 0)
 			return err;
 	}
@@ -2667,9 +2829,9 @@ await_fence_array(struct i915_execbuffer *eb)
 	return 0;
 }
 
-static void signal_fence_array(const struct i915_execbuffer *eb)
+static void signal_fence_array(const struct i915_execbuffer *eb,
+			       struct dma_fence * const fence)
 {
-	struct dma_fence * const fence = &eb->request->fence;
 	unsigned int n;
 
 	for (n = 0; n < eb->num_fences; n++) {
@@ -2717,9 +2879,9 @@ static void retire_requests(struct intel_timeline *tl, struct i915_request *end)
 			break;
 }
 
-static int eb_request_add(struct i915_execbuffer *eb, int err)
+static int eb_request_add(struct i915_execbuffer *eb, struct i915_request *rq,
+			  int err, bool last_parallel)
 {
-	struct i915_request *rq = eb->request;
 	struct intel_timeline * const tl = i915_request_timeline(rq);
 	struct i915_sched_attr attr = {};
 	struct i915_request *prev;
@@ -2741,6 +2903,17 @@ static int eb_request_add(struct i915_execbuffer *eb, int err)
 		err = -ENOENT; /* override any transient errors */
 	}
 
+	if (intel_context_is_parallel(eb->context)) {
+		if (err) {
+			__i915_request_skip(rq);
+			set_bit(I915_FENCE_FLAG_SKIP_PARALLEL,
+				&rq->fence.flags);
+		}
+		if (last_parallel)
+			set_bit(I915_FENCE_FLAG_SUBMIT_PARALLEL,
+				&rq->fence.flags);
+	}
+
 	__i915_request_queue(rq, &attr);
 
 	/* Try to clean up the client's timeline after submitting the request */
@@ -2752,6 +2925,25 @@ static int eb_request_add(struct i915_execbuffer *eb, int err)
 	return err;
 }
 
+static int eb_requests_add(struct i915_execbuffer *eb, int err)
+{
+	int i;
+
+	/*
+	 * We iterate in reverse order of creation to release timeline mutexes in
+	 * same order.
+	 */
+	for_each_batch_add_order(eb, i) {
+		struct i915_request *rq = eb->requests[i];
+
+		if (!rq)
+			continue;
+		err |= eb_request_add(eb, rq, err, i == 0);
+	}
+
+	return err;
+}
+
 static const i915_user_extension_fn execbuf_extensions[] = {
 	[DRM_I915_GEM_EXECBUFFER_EXT_TIMELINE_FENCES] = parse_timeline_fences,
 };
@@ -2778,6 +2970,185 @@ parse_execbuf2_extensions(struct drm_i915_gem_execbuffer2 *args,
 				    eb);
 }
 
+static void eb_requests_get(struct i915_execbuffer *eb)
+{
+	unsigned int i;
+
+	for_each_batch_create_order(eb, i) {
+		if (!eb->requests[i])
+			break;
+
+		i915_request_get(eb->requests[i]);
+	}
+}
+
+static void eb_requests_put(struct i915_execbuffer *eb)
+{
+	unsigned int i;
+
+	for_each_batch_create_order(eb, i) {
+		if (!eb->requests[i])
+			break;
+
+		i915_request_put(eb->requests[i]);
+	}
+}
+
+static struct sync_file *
+eb_composite_fence_create(struct i915_execbuffer *eb, int out_fence_fd)
+{
+	struct sync_file *out_fence = NULL;
+	struct dma_fence_array *fence_array;
+	struct dma_fence **fences;
+	unsigned int i;
+
+	GEM_BUG_ON(!intel_context_is_parent(eb->context));
+
+	fences = kmalloc_array(eb->num_batches, sizeof(*fences), GFP_KERNEL);
+	if (!fences)
+		return ERR_PTR(-ENOMEM);
+
+	for_each_batch_create_order(eb, i) {
+		fences[i] = &eb->requests[i]->fence;
+		__set_bit(I915_FENCE_FLAG_COMPOSITE,
+			  &eb->requests[i]->fence.flags);
+	}
+
+	fence_array = dma_fence_array_create(eb->num_batches,
+					     fences,
+					     eb->context->parallel.fence_context,
+					     eb->context->parallel.seqno,
+					     false);
+	if (!fence_array) {
+		kfree(fences);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/* Move ownership to the dma_fence_array created above */
+	for_each_batch_create_order(eb, i)
+		dma_fence_get(fences[i]);
+
+	if (out_fence_fd != -1) {
+		out_fence = sync_file_create(&fence_array->base);
+		/* sync_file now owns fence_arry, drop creation ref */
+		dma_fence_put(&fence_array->base);
+		if (!out_fence)
+			return ERR_PTR(-ENOMEM);
+	}
+
+	eb->composite_fence = &fence_array->base;
+
+	return out_fence;
+}
+
+static struct sync_file *
+eb_fences_add(struct i915_execbuffer *eb, struct i915_request *rq,
+	      struct dma_fence *in_fence, int out_fence_fd)
+{
+	struct sync_file *out_fence = NULL;
+	int err;
+
+	if (unlikely(eb->gem_context->syncobj)) {
+		struct dma_fence *fence;
+
+		fence = drm_syncobj_fence_get(eb->gem_context->syncobj);
+		err = i915_request_await_dma_fence(rq, fence);
+		dma_fence_put(fence);
+		if (err)
+			return ERR_PTR(err);
+	}
+
+	if (in_fence) {
+		if (eb->args->flags & I915_EXEC_FENCE_SUBMIT)
+			err = i915_request_await_execution(rq, in_fence);
+		else
+			err = i915_request_await_dma_fence(rq, in_fence);
+		if (err < 0)
+			return ERR_PTR(err);
+	}
+
+	if (eb->fences) {
+		err = await_fence_array(eb, rq);
+		if (err)
+			return ERR_PTR(err);
+	}
+
+	if (intel_context_is_parallel(eb->context)) {
+		out_fence = eb_composite_fence_create(eb, out_fence_fd);
+		if (IS_ERR(out_fence))
+			return ERR_PTR(-ENOMEM);
+	} else if (out_fence_fd != -1) {
+		out_fence = sync_file_create(&rq->fence);
+		if (!out_fence)
+			return ERR_PTR(-ENOMEM);
+	}
+
+	return out_fence;
+}
+
+static struct intel_context *
+eb_find_context(struct i915_execbuffer *eb, unsigned int context_number)
+{
+	struct intel_context *child;
+
+	if (likely(context_number == 0))
+		return eb->context;
+
+	for_each_child(eb->context, child)
+		if (!--context_number)
+			return child;
+
+	GEM_BUG_ON("Context not found");
+
+	return NULL;
+}
+
+static struct sync_file *
+eb_requests_create(struct i915_execbuffer *eb, struct dma_fence *in_fence,
+		   int out_fence_fd)
+{
+	struct sync_file *out_fence = NULL;
+	unsigned int i;
+
+	for_each_batch_create_order(eb, i) {
+		/* Allocate a request for this batch buffer nice and early. */
+		eb->requests[i] = i915_request_create(eb_find_context(eb, i));
+		if (IS_ERR(eb->requests[i])) {
+			out_fence = ERR_PTR(PTR_ERR(eb->requests[i]));
+			eb->requests[i] = NULL;
+			return out_fence;
+		}
+
+		/*
+		 * Only the first request added (committed to backend) has to
+		 * take the in fences into account as all subsequent requests
+		 * will have fences inserted inbetween them.
+		 */
+		if (i + 1 == eb->num_batches) {
+			out_fence = eb_fences_add(eb, eb->requests[i],
+						  in_fence, out_fence_fd);
+			if (IS_ERR(out_fence))
+				return out_fence;
+		}
+
+		/*
+		 * Whilst this request exists, batch_obj will be on the
+		 * active_list, and so will hold the active reference. Only when
+		 * this request is retired will the batch_obj be moved onto
+		 * the inactive_list and lose its active reference. Hence we do
+		 * not need to explicitly hold another reference here.
+		 */
+		eb->requests[i]->batch = eb->batches[i]->vma;
+		if (eb->batch_pool) {
+			GEM_BUG_ON(intel_context_is_parallel(eb->context));
+			intel_gt_buffer_pool_mark_active(eb->batch_pool,
+							 eb->requests[i]);
+		}
+	}
+
+	return out_fence;
+}
+
 static int
 i915_gem_do_execbuffer(struct drm_device *dev,
 		       struct drm_file *file,
@@ -2788,7 +3159,6 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	struct i915_execbuffer eb;
 	struct dma_fence *in_fence = NULL;
 	struct sync_file *out_fence = NULL;
-	struct i915_vma *batch;
 	int out_fence_fd = -1;
 	int err;
 
@@ -2812,12 +3182,15 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 
 	eb.buffer_count = args->buffer_count;
 	eb.batch_start_offset = args->batch_start_offset;
-	eb.batch_len = args->batch_len;
 	eb.trampoline = NULL;
 
 	eb.fences = NULL;
 	eb.num_fences = 0;
 
+	memset(eb.requests, 0, sizeof(struct i915_request *) *
+	       ARRAY_SIZE(eb.requests));
+	eb.composite_fence = NULL;
+
 	eb.batch_flags = 0;
 	if (args->flags & I915_EXEC_SECURE) {
 		if (GRAPHICS_VER(i915) >= 11)
@@ -2901,70 +3274,25 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 
 	ww_acquire_done(&eb.ww.ctx);
 
-	batch = eb.batch->vma;
-
-	/* Allocate a request for this batch buffer nice and early. */
-	eb.request = i915_request_create(eb.context);
-	if (IS_ERR(eb.request)) {
-		err = PTR_ERR(eb.request);
-		goto err_vma;
-	}
-
-	if (unlikely(eb.gem_context->syncobj)) {
-		struct dma_fence *fence;
-
-		fence = drm_syncobj_fence_get(eb.gem_context->syncobj);
-		err = i915_request_await_dma_fence(eb.request, fence);
-		dma_fence_put(fence);
-		if (err)
-			goto err_ext;
-	}
-
-	if (in_fence) {
-		if (args->flags & I915_EXEC_FENCE_SUBMIT)
-			err = i915_request_await_execution(eb.request,
-							   in_fence);
-		else
-			err = i915_request_await_dma_fence(eb.request,
-							   in_fence);
-		if (err < 0)
-			goto err_request;
-	}
-
-	if (eb.fences) {
-		err = await_fence_array(&eb);
-		if (err)
-			goto err_request;
-	}
-
-	if (out_fence_fd != -1) {
-		out_fence = sync_file_create(&eb.request->fence);
-		if (!out_fence) {
-			err = -ENOMEM;
+	out_fence = eb_requests_create(&eb, in_fence, out_fence_fd);
+	if (IS_ERR(out_fence)) {
+		err = PTR_ERR(out_fence);
+		if (eb.requests[0])
 			goto err_request;
-		}
+		else
+			goto err_vma;
 	}
 
-	/*
-	 * Whilst this request exists, batch_obj will be on the
-	 * active_list, and so will hold the active reference. Only when this
-	 * request is retired will the the batch_obj be moved onto the
-	 * inactive_list and lose its active reference. Hence we do not need
-	 * to explicitly hold another reference here.
-	 */
-	eb.request->batch = batch;
-	if (eb.batch_pool)
-		intel_gt_buffer_pool_mark_active(eb.batch_pool, eb.request);
-
-	trace_i915_request_queue(eb.request, eb.batch_flags);
-	err = eb_submit(&eb, batch);
+	err = eb_submit(&eb);
 
 err_request:
-	i915_request_get(eb.request);
-	err = eb_request_add(&eb, err);
+	eb_requests_get(&eb);
+	err = eb_requests_add(&eb, err);
 
 	if (eb.fences)
-		signal_fence_array(&eb);
+		signal_fence_array(&eb, eb.composite_fence ?
+				   eb.composite_fence :
+				   &eb.requests[0]->fence);
 
 	if (out_fence) {
 		if (err == 0) {
@@ -2979,10 +3307,15 @@ err_request:
 
 	if (unlikely(eb.gem_context->syncobj)) {
 		drm_syncobj_replace_fence(eb.gem_context->syncobj,
-					  &eb.request->fence);
+					  eb.composite_fence ?
+					  eb.composite_fence :
+					  &eb.requests[0]->fence);
 	}
 
-	i915_request_put(eb.request);
+	if (!out_fence && eb.composite_fence)
+		dma_fence_put(eb.composite_fence);
+
+	eb_requests_put(&eb);
 
 err_vma:
 	eb_release_vmas(&eb, true);