1 files changed, 182 insertions, 148 deletions

diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 4984ff565424..9585546556ee 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -1,30 +1,6 @@
+// SPDX-License-Identifier: MIT
 /*
- * Copyright © 2008-2010 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- *
- * Authors:
- *    Eric Anholt <eric@anholt.net>
- *    Zou Nan hai <nanhai.zou@intel.com>
- *    Xiang Hai hao<haihao.xiang@intel.com>
- *
+ * Copyright © 2008-2021 Intel Corporation
  */
 
 #include "gen2_engine_cs.h"
@@ -183,15 +159,36 @@ static void set_pp_dir(struct intel_engine_cs *engine)
 	}
 }
 
+static bool stop_ring(struct intel_engine_cs *engine)
+{
+	/* Empty the ring by skipping to the end */
+	ENGINE_WRITE_FW(engine, RING_HEAD, ENGINE_READ_FW(engine, RING_TAIL));
+	ENGINE_POSTING_READ(engine, RING_HEAD);
+
+	/* The ring must be empty before it is disabled */
+	ENGINE_WRITE_FW(engine, RING_CTL, 0);
+	ENGINE_POSTING_READ(engine, RING_CTL);
+
+	/* Then reset the disabled ring */
+	ENGINE_WRITE_FW(engine, RING_HEAD, 0);
+	ENGINE_WRITE_FW(engine, RING_TAIL, 0);
+
+	return (ENGINE_READ_FW(engine, RING_HEAD) & HEAD_ADDR) == 0;
+}
+
 static int xcs_resume(struct intel_engine_cs *engine)
 {
-	struct drm_i915_private *dev_priv = engine->i915;
 	struct intel_ring *ring = engine->legacy.ring;
 
 	ENGINE_TRACE(engine, "ring:{HEAD:%04x, TAIL:%04x}\n",
 		     ring->head, ring->tail);
 
-	if (HWS_NEEDS_PHYSICAL(dev_priv))
+	/* Double check the ring is empty & disabled before we resume */
+	synchronize_hardirq(engine->i915->drm.irq);
+	if (!stop_ring(engine))
+		goto err;
+
+	if (HWS_NEEDS_PHYSICAL(engine->i915))
 		ring_setup_phys_status_page(engine);
 	else
 		ring_setup_status_page(engine);
@@ -228,21 +225,10 @@ static int xcs_resume(struct intel_engine_cs *engine)
 	if (__intel_wait_for_register_fw(engine->uncore,
 					 RING_CTL(engine->mmio_base),
 					 RING_VALID, RING_VALID,
-					 5000, 0, NULL)) {
-		drm_err(&dev_priv->drm,
-			"%s initialization failed; "
-			"ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n",
-			engine->name,
-			ENGINE_READ(engine, RING_CTL),
-			ENGINE_READ(engine, RING_CTL) & RING_VALID,
-			ENGINE_READ(engine, RING_HEAD), ring->head,
-			ENGINE_READ(engine, RING_TAIL), ring->tail,
-			ENGINE_READ(engine, RING_START),
-			i915_ggtt_offset(ring->vma));
-		return -EIO;
-	}
+					 5000, 0, NULL))
+		goto err;
 
-	if (INTEL_GEN(dev_priv) > 2)
+	if (INTEL_GEN(engine->i915) > 2)
 		ENGINE_WRITE_FW(engine,
 				RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
 
@@ -255,6 +241,19 @@ static int xcs_resume(struct intel_engine_cs *engine)
 	/* Papering over lost _interrupts_ immediately following the restart */
 	intel_engine_signal_breadcrumbs(engine);
 	return 0;
+
+err:
+	drm_err(&engine->i915->drm,
+		"%s initialization failed; "
+		"ctl %08x (valid? %d) head %08x [%08x] tail %08x [%08x] start %08x [expected %08x]\n",
+		engine->name,
+		ENGINE_READ(engine, RING_CTL),
+		ENGINE_READ(engine, RING_CTL) & RING_VALID,
+		ENGINE_READ(engine, RING_HEAD), ring->head,
+		ENGINE_READ(engine, RING_TAIL), ring->tail,
+		ENGINE_READ(engine, RING_START),
+		i915_ggtt_offset(ring->vma));
+	return -EIO;
 }
 
 static void sanitize_hwsp(struct intel_engine_cs *engine)
@@ -290,23 +289,6 @@ static void xcs_sanitize(struct intel_engine_cs *engine)
 	clflush_cache_range(engine->status_page.addr, PAGE_SIZE);
 }
 
-static bool stop_ring(struct intel_engine_cs *engine)
-{
-	/* Empty the ring by skipping to the end */
-	ENGINE_WRITE_FW(engine, RING_HEAD, ENGINE_READ_FW(engine, RING_TAIL));
-	ENGINE_POSTING_READ(engine, RING_HEAD);
-
-	/* The ring must be empty before it is disabled */
-	ENGINE_WRITE_FW(engine, RING_CTL, 0);
-	ENGINE_POSTING_READ(engine, RING_CTL);
-
-	/* Then reset the disabled ring */
-	ENGINE_WRITE_FW(engine, RING_HEAD, 0);
-	ENGINE_WRITE_FW(engine, RING_TAIL, 0);
-
-	return (ENGINE_READ_FW(engine, RING_HEAD) & HEAD_ADDR) == 0;
-}
-
 static void reset_prepare(struct intel_engine_cs *engine)
 {
 	/*
@@ -329,25 +311,23 @@ static void reset_prepare(struct intel_engine_cs *engine)
 
 	if (!stop_ring(engine)) {
 		/* G45 ring initialization often fails to reset head to zero */
-		drm_dbg(&engine->i915->drm,
-			"%s head not reset to zero "
-			"ctl %08x head %08x tail %08x start %08x\n",
-			engine->name,
-			ENGINE_READ_FW(engine, RING_CTL),
-			ENGINE_READ_FW(engine, RING_HEAD),
-			ENGINE_READ_FW(engine, RING_TAIL),
-			ENGINE_READ_FW(engine, RING_START));
-	}
-
-	if (!stop_ring(engine)) {
-		drm_err(&engine->i915->drm,
-			"failed to set %s head to zero "
-			"ctl %08x head %08x tail %08x start %08x\n",
-			engine->name,
-			ENGINE_READ_FW(engine, RING_CTL),
-			ENGINE_READ_FW(engine, RING_HEAD),
-			ENGINE_READ_FW(engine, RING_TAIL),
-			ENGINE_READ_FW(engine, RING_START));
+		ENGINE_TRACE(engine,
+			     "HEAD not reset to zero, "
+			     "{ CTL:%08x, HEAD:%08x, TAIL:%08x, START:%08x }\n",
+			     ENGINE_READ_FW(engine, RING_CTL),
+			     ENGINE_READ_FW(engine, RING_HEAD),
+			     ENGINE_READ_FW(engine, RING_TAIL),
+			     ENGINE_READ_FW(engine, RING_START));
+		if (!stop_ring(engine)) {
+			drm_err(&engine->i915->drm,
+				"failed to set %s head to zero "
+				"ctl %08x head %08x tail %08x start %08x\n",
+				engine->name,
+				ENGINE_READ_FW(engine, RING_CTL),
+				ENGINE_READ_FW(engine, RING_HEAD),
+				ENGINE_READ_FW(engine, RING_TAIL),
+				ENGINE_READ_FW(engine, RING_START));
+		}
 	}
 }
 
@@ -431,7 +411,7 @@ static void reset_cancel(struct intel_engine_cs *engine)
 
 	/* Mark all submitted requests as skipped. */
 	list_for_each_entry(request, &engine->active.requests, sched.link)
-		i915_request_mark_eio(request);
+		i915_request_put(i915_request_mark_eio(request));
 	intel_engine_signal_breadcrumbs(engine);
 
 	/* Remaining _unready_ requests will be nop'ed when submitted */
@@ -466,6 +446,26 @@ static void ring_context_destroy(struct kref *ref)
 	intel_context_free(ce);
 }
 
+static int ring_context_init_default_state(struct intel_context *ce,
+					   struct i915_gem_ww_ctx *ww)
+{
+	struct drm_i915_gem_object *obj = ce->state->obj;
+	void *vaddr;
+
+	vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
+	if (IS_ERR(vaddr))
+		return PTR_ERR(vaddr);
+
+	shmem_read(ce->engine->default_state, 0,
+		   vaddr, ce->engine->context_size);
+
+	i915_gem_object_flush_map(obj);
+	__i915_gem_object_release_map(obj);
+
+	__set_bit(CONTEXT_VALID_BIT, &ce->flags);
+	return 0;
+}
+
 static int ring_context_pre_pin(struct intel_context *ce,
 				struct i915_gem_ww_ctx *ww,
 				void **unused)
@@ -473,6 +473,13 @@ static int ring_context_pre_pin(struct intel_context *ce,
 	struct i915_address_space *vm;
 	int err = 0;
 
+	if (ce->engine->default_state &&
+	    !test_bit(CONTEXT_VALID_BIT, &ce->flags)) {
+		err = ring_context_init_default_state(ce, ww);
+		if (err)
+			return err;
+	}
+
 	vm = vm_alias(ce->vm);
 	if (vm)
 		err = gen6_ppgtt_pin(i915_vm_to_ppgtt((vm)), ww);
@@ -528,22 +535,6 @@ alloc_context_vma(struct intel_engine_cs *engine)
 	if (IS_IVYBRIDGE(i915))
 		i915_gem_object_set_cache_coherency(obj, I915_CACHE_L3_LLC);
 
-	if (engine->default_state) {
-		void *vaddr;
-
-		vaddr = i915_gem_object_pin_map(obj, I915_MAP_WB);
-		if (IS_ERR(vaddr)) {
-			err = PTR_ERR(vaddr);
-			goto err_obj;
-		}
-
-		shmem_read(engine->default_state, 0,
-			   vaddr, engine->context_size);
-
-		i915_gem_object_flush_map(obj);
-		__i915_gem_object_release_map(obj);
-	}
-
 	vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);
@@ -575,8 +566,6 @@ static int ring_context_alloc(struct intel_context *ce)
 			return PTR_ERR(vma);
 
 		ce->state = vma;
-		if (engine->default_state)
-			__set_bit(CONTEXT_VALID_BIT, &ce->flags);
 	}
 
 	return 0;
@@ -761,13 +750,14 @@ static int mi_set_context(struct i915_request *rq,
 
 static int remap_l3_slice(struct i915_request *rq, int slice)
 {
+#define L3LOG_DW (GEN7_L3LOG_SIZE / sizeof(u32))
 	u32 *cs, *remap_info = rq->engine->i915->l3_parity.remap_info[slice];
 	int i;
 
 	if (!remap_info)
 		return 0;
 
-	cs = intel_ring_begin(rq, GEN7_L3LOG_SIZE/4 * 2 + 2);
+	cs = intel_ring_begin(rq, L3LOG_DW * 2 + 2);
 	if (IS_ERR(cs))
 		return PTR_ERR(cs);
 
@@ -776,8 +766,8 @@ static int remap_l3_slice(struct i915_request *rq, int slice)
 	 * here because no other code should access these registers other than
 	 * at initialization time.
 	 */
-	*cs++ = MI_LOAD_REGISTER_IMM(GEN7_L3LOG_SIZE/4);
-	for (i = 0; i < GEN7_L3LOG_SIZE/4; i++) {
+	*cs++ = MI_LOAD_REGISTER_IMM(L3LOG_DW);
+	for (i = 0; i < L3LOG_DW; i++) {
 		*cs++ = i915_mmio_reg_offset(GEN7_L3LOG(slice, i));
 		*cs++ = remap_info[i];
 	}
@@ -785,6 +775,7 @@ static int remap_l3_slice(struct i915_request *rq, int slice)
 	intel_ring_advance(rq, cs);
 
 	return 0;
+#undef L3LOG_DW
 }
 
 static int remap_l3(struct i915_request *rq)
@@ -1176,37 +1167,15 @@ static int gen7_ctx_switch_bb_setup(struct intel_engine_cs * const engine,
 	return gen7_setup_clear_gpr_bb(engine, vma);
 }
 
-static int gen7_ctx_switch_bb_init(struct intel_engine_cs *engine)
+static int gen7_ctx_switch_bb_init(struct intel_engine_cs *engine,
+				   struct i915_gem_ww_ctx *ww,
+				   struct i915_vma *vma)
 {
-	struct drm_i915_gem_object *obj;
-	struct i915_vma *vma;
-	int size;
 	int err;
 
-	size = gen7_ctx_switch_bb_setup(engine, NULL /* probe size */);
-	if (size <= 0)
-		return size;
-
-	size = ALIGN(size, PAGE_SIZE);
-	obj = i915_gem_object_create_internal(engine->i915, size);
-	if (IS_ERR(obj))
-		return PTR_ERR(obj);
-
-	vma = i915_vma_instance(obj, engine->gt->vm, NULL);
-	if (IS_ERR(vma)) {
-		err = PTR_ERR(vma);
-		goto err_obj;
-	}
-
-	vma->private = intel_context_create(engine); /* dummy residuals */
-	if (IS_ERR(vma->private)) {
-		err = PTR_ERR(vma->private);
-		goto err_obj;
-	}
-
-	err = i915_vma_pin(vma, 0, 0, PIN_USER | PIN_HIGH);
+	err = i915_vma_pin_ww(vma, ww, 0, 0, PIN_USER | PIN_HIGH);
 	if (err)
-		goto err_private;
+		return err;
 
 	err = i915_vma_sync(vma);
 	if (err)
@@ -1221,17 +1190,53 @@ static int gen7_ctx_switch_bb_init(struct intel_engine_cs *engine)
 
 err_unpin:
 	i915_vma_unpin(vma);
-err_private:
-	intel_context_put(vma->private);
-err_obj:
-	i915_gem_object_put(obj);
 	return err;
 }
 
+static struct i915_vma *gen7_ctx_vma(struct intel_engine_cs *engine)
+{
+	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
+	int size, err;
+
+	if (!IS_GEN(engine->i915, 7) || engine->class != RENDER_CLASS)
+		return 0;
+
+	err = gen7_ctx_switch_bb_setup(engine, NULL /* probe size */);
+	if (err < 0)
+		return ERR_PTR(err);
+	if (!err)
+		return NULL;
+
+	size = ALIGN(err, PAGE_SIZE);
+
+	obj = i915_gem_object_create_internal(engine->i915, size);
+	if (IS_ERR(obj))
+		return ERR_CAST(obj);
+
+	vma = i915_vma_instance(obj, engine->gt->vm, NULL);
+	if (IS_ERR(vma)) {
+		i915_gem_object_put(obj);
+		return ERR_CAST(vma);
+	}
+
+	vma->private = intel_context_create(engine); /* dummy residuals */
+	if (IS_ERR(vma->private)) {
+		err = PTR_ERR(vma->private);
+		vma->private = NULL;
+		i915_gem_object_put(obj);
+		return ERR_PTR(err);
+	}
+
+	return vma;
+}
+
 int intel_ring_submission_setup(struct intel_engine_cs *engine)
 {
+	struct i915_gem_ww_ctx ww;
 	struct intel_timeline *timeline;
 	struct intel_ring *ring;
+	struct i915_vma *gen7_wa_vma;
 	int err;
 
 	setup_common(engine);
@@ -1262,43 +1267,72 @@ int intel_ring_submission_setup(struct intel_engine_cs *engine)
 	}
 	GEM_BUG_ON(timeline->has_initial_breadcrumb);
 
-	err = intel_timeline_pin(timeline, NULL);
-	if (err)
-		goto err_timeline;
-
 	ring = intel_engine_create_ring(engine, SZ_16K);
 	if (IS_ERR(ring)) {
 		err = PTR_ERR(ring);
-		goto err_timeline_unpin;
+		goto err_timeline;
 	}
 
-	err = intel_ring_pin(ring, NULL);
-	if (err)
-		goto err_ring;
-
 	GEM_BUG_ON(engine->legacy.ring);
 	engine->legacy.ring = ring;
 	engine->legacy.timeline = timeline;
 
-	GEM_BUG_ON(timeline->hwsp_ggtt != engine->status_page.vma);
+	gen7_wa_vma = gen7_ctx_vma(engine);
+	if (IS_ERR(gen7_wa_vma)) {
+		err = PTR_ERR(gen7_wa_vma);
+		goto err_ring;
+	}
 
-	if (IS_GEN(engine->i915, 7) && engine->class == RENDER_CLASS) {
-		err = gen7_ctx_switch_bb_init(engine);
+	i915_gem_ww_ctx_init(&ww, false);
+
+retry:
+	err = i915_gem_object_lock(timeline->hwsp_ggtt->obj, &ww);
+	if (!err && gen7_wa_vma)
+		err = i915_gem_object_lock(gen7_wa_vma->obj, &ww);
+	if (!err && engine->legacy.ring->vma->obj)
+		err = i915_gem_object_lock(engine->legacy.ring->vma->obj, &ww);
+	if (!err)
+		err = intel_timeline_pin(timeline, &ww);
+	if (!err) {
+		err = intel_ring_pin(ring, &ww);
 		if (err)
-			goto err_ring_unpin;
+			intel_timeline_unpin(timeline);
+	}
+	if (err)
+		goto out;
+
+	GEM_BUG_ON(timeline->hwsp_ggtt != engine->status_page.vma);
+
+	if (gen7_wa_vma) {
+		err = gen7_ctx_switch_bb_init(engine, &ww, gen7_wa_vma);
+		if (err) {
+			intel_ring_unpin(ring);
+			intel_timeline_unpin(timeline);
+		}
 	}
 
+out:
+	if (err == -EDEADLK) {
+		err = i915_gem_ww_ctx_backoff(&ww);
+		if (!err)
+			goto retry;
+	}
+	i915_gem_ww_ctx_fini(&ww);
+	if (err)
+		goto err_gen7_put;
+
 	/* Finally, take ownership and responsibility for cleanup! */
 	engine->release = ring_release;
 
 	return 0;
 
-err_ring_unpin:
-	intel_ring_unpin(ring);
+err_gen7_put:
+	if (gen7_wa_vma) {
+		intel_context_put(gen7_wa_vma->private);
+		i915_gem_object_put(gen7_wa_vma->obj);
+	}
 err_ring:
 	intel_ring_put(ring);
-err_timeline_unpin:
-	intel_timeline_unpin(timeline);
 err_timeline:
 	intel_timeline_put(timeline);
 err: