[Intel-gfx] [PATCH 1/3] drm/i915: Flush idle barriers when waiting

[Intel-gfx] [PATCH 1/3] drm/i915: Flush idle barriers when waiting

[Chris Wilson]

If we do find ourselves with an idle barrier inside our active while
waiting, attempt to flush it by emitting a pulse using the kernel
context.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Steve Carbonari <steven.carbonari@intel.com>
---
 drivers/gpu/drm/i915/i915_active.c           | 42 ++++++++++++++----
 drivers/gpu/drm/i915/selftests/i915_active.c | 46 ++++++++++++++++++++
 2 files changed, 79 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_active.c b/drivers/gpu/drm/i915/i915_active.c
index 9ccb931a733e..fae7e3820592 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -7,6 +7,7 @@
 #include <linux/debugobjects.h>
 
 #include "gt/intel_context.h"
+#include "gt/intel_engine_heartbeat.h"
 #include "gt/intel_engine_pm.h"
 #include "gt/intel_ring.h"
 
@@ -460,26 +461,49 @@ static void enable_signaling(struct i915_active_fence *active)
 	dma_fence_put(fence);
 }
 
-int i915_active_wait(struct i915_active *ref)
+static int flush_barrier(struct active_node *it)
 {
-	struct active_node *it, *n;
-	int err = 0;
+	struct intel_engine_cs *engine;
 
-	might_sleep();
+	if (!is_barrier(&it->base))
+		return 0;
 
-	if (!i915_active_acquire_if_busy(ref))
+	engine = __barrier_to_engine(it);
+	smp_rmb(); /* serialise with add_active_barriers */
+	if (!is_barrier(&it->base))
 		return 0;
 
-	/* Flush lazy signals */
+	return intel_engine_flush_barriers(engine);
+}
+
+static int flush_lazy_signals(struct i915_active *ref)
+{
+	struct active_node *it, *n;
+	int err = 0;
+
 	enable_signaling(&ref->excl);
 	rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
-		if (is_barrier(&it->base)) /* unconnected idle barrier */
-			continue;
+		err = flush_barrier(it); /* unconnected idle barrier? */
+		if (err)
+			break;
 
 		enable_signaling(&it->base);
 	}
-	/* Any fence added after the wait begins will not be auto-signaled */
 
+	return err;
+}
+
+int i915_active_wait(struct i915_active *ref)
+{
+	int err;
+
+	might_sleep();
+
+	if (!i915_active_acquire_if_busy(ref))
+		return 0;
+
+	/* Any fence added after the wait begins will not be auto-signaled */
+	err = flush_lazy_signals(ref);
 	i915_active_release(ref);
 	if (err)
 		return err;
diff --git a/drivers/gpu/drm/i915/selftests/i915_active.c b/drivers/gpu/drm/i915/selftests/i915_active.c
index ef572a0c2566..067e30b8927f 100644
--- a/drivers/gpu/drm/i915/selftests/i915_active.c
+++ b/drivers/gpu/drm/i915/selftests/i915_active.c
@@ -201,11 +201,57 @@ static int live_active_retire(void *arg)
 	return err;
 }
 
+static int live_active_barrier(void *arg)
+{
+	struct drm_i915_private *i915 = arg;
+	struct intel_engine_cs *engine;
+	struct live_active *active;
+	int err = 0;
+
+	/* Check that we get a callback when requests retire upon waiting */
+
+	active = __live_alloc(i915);
+	if (!active)
+		return -ENOMEM;
+
+	err = i915_active_acquire(&active->base);
+	if (err)
+		goto out;
+
+	for_each_uabi_engine(engine, i915) {
+		err = i915_active_acquire_preallocate_barrier(&active->base,
+							      engine);
+		if (err)
+			break;
+
+		i915_active_acquire_barrier(&active->base);
+	}
+
+	i915_active_release(&active->base);
+
+	if (err == 0)
+		err = i915_active_wait(&active->base);
+
+	if (err == 0 && !READ_ONCE(active->retired)) {
+		pr_err("i915_active not retired after flushing barriers!\n");
+		err = -EINVAL;
+	}
+
+out:
+	__live_put(active);
+
+	if (igt_flush_test(i915))
+		err = -EIO;
+
+	return err;
+}
+
 int i915_active_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(live_active_wait),
 		SUBTEST(live_active_retire),
+		SUBTEST(live_active_barrier),
 	};
 
 	if (intel_gt_is_wedged(&i915->gt))
-- 
2.25.1

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[Intel-gfx] [PATCH 2/3] drm/i915: Allow userspace to specify ringsize on construction

[Chris Wilson]

No good reason why we must always use a static ringsize, so let
userspace select one during construction.

Link: https://github.com/intel/compute-runtime/pull/261
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Steve Carbonari <steven.carbonari@intel.com>
Reviewed-by: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com>
---
 drivers/gpu/drm/i915/Makefile                 |   1 +
 drivers/gpu/drm/i915/gem/i915_gem_context.c   | 110 ++++++++++++++++--
 drivers/gpu/drm/i915/gt/intel_context_param.c |  63 ++++++++++
 drivers/gpu/drm/i915/gt/intel_context_param.h |  14 +++
 drivers/gpu/drm/i915/gt/intel_lrc.c           |   1 +
 include/uapi/drm/i915_drm.h                   |  21 ++++
 6 files changed, 202 insertions(+), 8 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gt/intel_context_param.c
 create mode 100644 drivers/gpu/drm/i915/gt/intel_context_param.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index b314d44ded5e..22a23134e98e 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -82,6 +82,7 @@ gt-y += \
 	gt/gen8_ppgtt.o \
 	gt/intel_breadcrumbs.o \
 	gt/intel_context.o \
+	gt/intel_context_param.o \
 	gt/intel_context_sseu.o \
 	gt/intel_engine_cs.o \
 	gt/intel_engine_heartbeat.o \
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index adcebf22a3d3..b24ee8e104cf 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -71,6 +71,7 @@
 
 #include "gt/gen6_ppgtt.h"
 #include "gt/intel_context.h"
+#include "gt/intel_context_param.h"
 #include "gt/intel_engine_heartbeat.h"
 #include "gt/intel_engine_user.h"
 #include "gt/intel_ring.h"
@@ -668,23 +669,30 @@ __create_context(struct drm_i915_private *i915)
 	return ERR_PTR(err);
 }
 
-static void
+static int
 context_apply_all(struct i915_gem_context *ctx,
-		  void (*fn)(struct intel_context *ce, void *data),
+		  int (*fn)(struct intel_context *ce, void *data),
 		  void *data)
 {
 	struct i915_gem_engines_iter it;
 	struct intel_context *ce;
+	int err = 0;
 
-	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it)
-		fn(ce, data);
+	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
+		err = fn(ce, data);
+		if (err)
+			break;
+	}
 	i915_gem_context_unlock_engines(ctx);
+
+	return err;
 }
 
-static void __apply_ppgtt(struct intel_context *ce, void *vm)
+static int __apply_ppgtt(struct intel_context *ce, void *vm)
 {
 	i915_vm_put(ce->vm);
 	ce->vm = i915_vm_get(vm);
+	return 0;
 }
 
 static struct i915_address_space *
@@ -722,9 +730,10 @@ static void __set_timeline(struct intel_timeline **dst,
 		intel_timeline_put(old);
 }
 
-static void __apply_timeline(struct intel_context *ce, void *timeline)
+static int __apply_timeline(struct intel_context *ce, void *timeline)
 {
 	__set_timeline(&ce->timeline, timeline);
+	return 0;
 }
 
 static void __assign_timeline(struct i915_gem_context *ctx,
@@ -1215,6 +1224,63 @@ static int set_ppgtt(struct drm_i915_file_private *file_priv,
 	return err;
 }
 
+static int __apply_ringsize(struct intel_context *ce, void *sz)
+{
+	return intel_context_set_ring_size(ce, (unsigned long)sz);
+}
+
+static int set_ringsize(struct i915_gem_context *ctx,
+			struct drm_i915_gem_context_param *args)
+{
+	if (!HAS_LOGICAL_RING_CONTEXTS(ctx->i915))
+		return -ENODEV;
+
+	if (args->size)
+		return -EINVAL;
+
+	if (!IS_ALIGNED(args->value, I915_GTT_PAGE_SIZE))
+		return -EINVAL;
+
+	if (args->value < I915_GTT_PAGE_SIZE)
+		return -EINVAL;
+
+	if (args->value > 128 * I915_GTT_PAGE_SIZE)
+		return -EINVAL;
+
+	return context_apply_all(ctx,
+				 __apply_ringsize,
+				 __intel_context_ring_size(args->value));
+}
+
+static int __get_ringsize(struct intel_context *ce, void *arg)
+{
+	long sz;
+
+	sz = intel_context_get_ring_size(ce);
+	GEM_BUG_ON(sz > INT_MAX);
+
+	return sz; /* stop on first engine */
+}
+
+static int get_ringsize(struct i915_gem_context *ctx,
+			struct drm_i915_gem_context_param *args)
+{
+	int sz;
+
+	if (!HAS_LOGICAL_RING_CONTEXTS(ctx->i915))
+		return -ENODEV;
+
+	if (args->size)
+		return -EINVAL;
+
+	sz = context_apply_all(ctx, __get_ringsize, NULL);
+	if (sz < 0)
+		return sz;
+
+	args->value = sz;
+	return 0;
+}
+
 static int
 user_to_context_sseu(struct drm_i915_private *i915,
 		     const struct drm_i915_gem_context_param_sseu *user,
@@ -1852,17 +1918,19 @@ set_persistence(struct i915_gem_context *ctx,
 	return __context_set_persistence(ctx, args->value);
 }
 
-static void __apply_priority(struct intel_context *ce, void *arg)
+static int __apply_priority(struct intel_context *ce, void *arg)
 {
 	struct i915_gem_context *ctx = arg;
 
 	if (!intel_engine_has_semaphores(ce->engine))
-		return;
+		return 0;
 
 	if (ctx->sched.priority >= I915_PRIORITY_NORMAL)
 		intel_context_set_use_semaphores(ce);
 	else
 		intel_context_clear_use_semaphores(ce);
+
+	return 0;
 }
 
 static int set_priority(struct i915_gem_context *ctx,
@@ -1955,6 +2023,10 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv,
 		ret = set_persistence(ctx, args);
 		break;
 
+	case I915_CONTEXT_PARAM_RINGSIZE:
+		ret = set_ringsize(ctx, args);
+		break;
+
 	case I915_CONTEXT_PARAM_BAN_PERIOD:
 	default:
 		ret = -EINVAL;
@@ -1983,6 +2055,18 @@ static int create_setparam(struct i915_user_extension __user *ext, void *data)
 	return ctx_setparam(arg->fpriv, arg->ctx, &local.param);
 }
 
+static int copy_ring_size(struct intel_context *dst,
+			  struct intel_context *src)
+{
+	long sz;
+
+	sz = intel_context_get_ring_size(src);
+	if (sz < 0)
+		return sz;
+
+	return intel_context_set_ring_size(dst, sz);
+}
+
 static int clone_engines(struct i915_gem_context *dst,
 			 struct i915_gem_context *src)
 {
@@ -2026,6 +2110,12 @@ static int clone_engines(struct i915_gem_context *dst,
 		}
 
 		intel_context_set_gem(clone->engines[n], dst);
+
+		/* Copy across the preferred ringsize */
+		if (copy_ring_size(clone->engines[n], e->engines[n])) {
+			__free_engines(clone, n + 1);
+			goto err_unlock;
+		}
 	}
 	clone->num_engines = n;
 
@@ -2388,6 +2478,10 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 		args->value = i915_gem_context_is_persistent(ctx);
 		break;
 
+	case I915_CONTEXT_PARAM_RINGSIZE:
+		ret = get_ringsize(ctx, args);
+		break;
+
 	case I915_CONTEXT_PARAM_BAN_PERIOD:
 	default:
 		ret = -EINVAL;
diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.c b/drivers/gpu/drm/i915/gt/intel_context_param.c
new file mode 100644
index 000000000000..65dcd090245d
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_context_param.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include "i915_active.h"
+#include "intel_context.h"
+#include "intel_context_param.h"
+#include "intel_ring.h"
+
+int intel_context_set_ring_size(struct intel_context *ce, long sz)
+{
+	int err;
+
+	if (intel_context_lock_pinned(ce))
+		return -EINTR;
+
+	err = i915_active_wait(&ce->active);
+	if (err < 0)
+		goto unlock;
+
+	if (intel_context_is_pinned(ce)) {
+		err = -EBUSY; /* In active use, come back later! */
+		goto unlock;
+	}
+
+	if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
+		struct intel_ring *ring;
+
+		/* Replace the existing ringbuffer */
+		ring = intel_engine_create_ring(ce->engine, sz);
+		if (IS_ERR(ring)) {
+			err = PTR_ERR(ring);
+			goto unlock;
+		}
+
+		intel_ring_put(ce->ring);
+		ce->ring = ring;
+
+		/* Context image will be updated on next pin */
+	} else {
+		ce->ring = __intel_context_ring_size(sz);
+	}
+
+unlock:
+	intel_context_unlock_pinned(ce);
+	return err;
+}
+
+long intel_context_get_ring_size(struct intel_context *ce)
+{
+	long sz = (unsigned long)READ_ONCE(ce->ring);
+
+	if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
+		if (intel_context_lock_pinned(ce))
+			return -EINTR;
+
+		sz = ce->ring->size;
+		intel_context_unlock_pinned(ce);
+	}
+
+	return sz;
+}
diff --git a/drivers/gpu/drm/i915/gt/intel_context_param.h b/drivers/gpu/drm/i915/gt/intel_context_param.h
new file mode 100644
index 000000000000..f053d8633fe2
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_context_param.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef INTEL_CONTEXT_PARAM_H
+#define INTEL_CONTEXT_PARAM_H
+
+struct intel_context;
+
+int intel_context_set_ring_size(struct intel_context *ce, long sz);
+long intel_context_get_ring_size(struct intel_context *ce);
+
+#endif /* INTEL_CONTEXT_PARAM_H */
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 47561dc29304..39b0125b7143 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2966,6 +2966,7 @@ __execlists_update_reg_state(const struct intel_context *ce,
 	regs[CTX_RING_START] = i915_ggtt_offset(ring->vma);
 	regs[CTX_RING_HEAD] = head;
 	regs[CTX_RING_TAIL] = ring->tail;
+	regs[CTX_RING_CTL] = RING_CTL_SIZE(ring->size) | RING_VALID;
 
 	/* RPCS */
 	if (engine->class == RENDER_CLASS) {
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 829c0a48577f..2813e579b480 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1619,6 +1619,27 @@ struct drm_i915_gem_context_param {
  * By default, new contexts allow persistence.
  */
 #define I915_CONTEXT_PARAM_PERSISTENCE	0xb
+
+/*
+ * I915_CONTEXT_PARAM_RINGSIZE:
+ *
+ * Sets the size of the CS ringbuffer to use for logical ring contexts. This
+ * applies a limit of how many batches can be queued to HW before the caller
+ * is blocked due to lack of space for more commands.
+ *
+ * Only reliably possible to be set prior to first use, i.e. during
+ * construction. At any later point, the current execution must be flushed as
+ * the ring can only be changed while the context is idle. Note, the ringsize
+ * can be specified as a constructor property, see
+ * I915_CONTEXT_CREATE_EXT_SETPARAM, but can also be set later if required.
+ *
+ * Only applies to the current set of engine and lost when those engines
+ * are replaced by a new mapping (see I915_CONTEXT_PARAM_ENGINES).
+ *
+ * Must be between 4 - 512 KiB, in intervals of page size [4 KiB].
+ * Default is 16 KiB.
+ */
+#define I915_CONTEXT_PARAM_RINGSIZE	0xc
 /* Must be kept compact -- no holes and well documented */
 
 	__u64 value;
-- 
2.25.1

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[Intel-gfx] [PATCH 3/3] drm/i915/gem: Honour O_NONBLOCK before throttling execbuf submissions

[Chris Wilson]

Check the user's flags on the struct file before deciding whether or not
to stall before submitting a request. This allows us to reasonably
cheaply honour O_NONBLOCK without checking at more critical phases
during request submission.

Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Steve Carbonari <steven.carbonari@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 21 ++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 87fa5f42c39a..8646d76f4b6e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2327,15 +2327,22 @@ static int __eb_pin_engine(struct i915_execbuffer *eb, struct intel_context *ce)
 	intel_context_timeline_unlock(tl);
 
 	if (rq) {
-		if (i915_request_wait(rq,
-				      I915_WAIT_INTERRUPTIBLE,
-				      MAX_SCHEDULE_TIMEOUT) < 0) {
-			i915_request_put(rq);
-			err = -EINTR;
-			goto err_exit;
-		}
+		bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
+		long timeout;
+
+		timeout = MAX_SCHEDULE_TIMEOUT;
+		if (nonblock)
+			timeout = 0;
 
+		timeout = i915_request_wait(rq,
+					    I915_WAIT_INTERRUPTIBLE,
+					    timeout);
 		i915_request_put(rq);
+
+		if (timeout < 0) {
+			err = nonblock ? -EWOULDBLOCK : timeout;
+			goto err_exit;
+		}
 	}
 
 	eb->engine = ce->engine;
-- 
2.25.1

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[Intel-gfx] [PATCH] drm/i915/gem: Only call eb_lookup_vma once during execbuf ioctl

[Chris Wilson]

As we no longer stash anything inside i915_vma under the exclusive
protection of struct_mutex, we do not need to revoke the i915_vma
stashes before dropping struct_mutex to handle pagefaults. Knowing that
we must drop the struct_mutex while keeping the eb->vma around, means
that we are required to hold onto to the object reference until we have
marked the vma as active.

Fixes: 155ab8836caa ("drm/i915: Move object close under its own lock")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 109 +++++++-----------
 1 file changed, 43 insertions(+), 66 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 3ccd3a096486..e4e50155145e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -48,17 +48,15 @@ enum {
 #define DBG_FORCE_RELOC 0 /* choose one of the above! */
 };
 
-#define __EXEC_OBJECT_HAS_REF		BIT(31)
-#define __EXEC_OBJECT_HAS_PIN		BIT(30)
-#define __EXEC_OBJECT_HAS_FENCE		BIT(29)
-#define __EXEC_OBJECT_NEEDS_MAP		BIT(28)
-#define __EXEC_OBJECT_NEEDS_BIAS	BIT(27)
-#define __EXEC_OBJECT_INTERNAL_FLAGS	(~0u << 27) /* all of the above */
+#define __EXEC_OBJECT_HAS_PIN		BIT(31)
+#define __EXEC_OBJECT_HAS_FENCE		BIT(30)
+#define __EXEC_OBJECT_NEEDS_MAP		BIT(29)
+#define __EXEC_OBJECT_NEEDS_BIAS	BIT(28)
+#define __EXEC_OBJECT_INTERNAL_FLAGS	(~0u << 28) /* all of the above */
 #define __EXEC_OBJECT_RESERVED (__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_FENCE)
 
 #define __EXEC_HAS_RELOC	BIT(31)
-#define __EXEC_VALIDATED	BIT(30)
-#define __EXEC_INTERNAL_FLAGS	(~0u << 30)
+#define __EXEC_INTERNAL_FLAGS	(~0u << 31)
 #define UPDATE			PIN_OFFSET_FIXED
 
 #define BATCH_OFFSET_BIAS (256*1024)
@@ -473,24 +471,17 @@ eb_validate_vma(struct i915_execbuffer *eb,
 	return 0;
 }
 
-static int
+static void
 eb_add_vma(struct i915_execbuffer *eb,
 	   unsigned int i, unsigned batch_idx,
 	   struct i915_vma *vma)
 {
 	struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
 	struct eb_vma *ev = &eb->vma[i];
-	int err;
 
 	GEM_BUG_ON(i915_vma_is_closed(vma));
 
-	if (!(eb->args->flags & __EXEC_VALIDATED)) {
-		err = eb_validate_vma(eb, entry, vma);
-		if (unlikely(err))
-			return err;
-	}
-
-	ev->vma = vma;
+	ev->vma = i915_vma_get(vma);
 	ev->exec = entry;
 	ev->flags = entry->flags;
 
@@ -523,20 +514,14 @@ eb_add_vma(struct i915_execbuffer *eb,
 		eb->batch = ev;
 	}
 
-	err = 0;
 	if (eb_pin_vma(eb, entry, ev)) {
 		if (entry->offset != vma->node.start) {
 			entry->offset = vma->node.start | UPDATE;
 			eb->args->flags |= __EXEC_HAS_RELOC;
 		}
 	} else {
-		eb_unreserve_vma(ev);
-
 		list_add_tail(&ev->bind_link, &eb->unbound);
-		if (drm_mm_node_allocated(&vma->node))
-			err = i915_vma_unbind(vma);
 	}
-	return err;
 }
 
 static inline int use_cpu_reloc(const struct reloc_cache *cache,
@@ -585,6 +570,14 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb, struct eb_vma *ev)
 		pin_flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
 	}
 
+	if (drm_mm_node_allocated(&vma->node) &&
+	    eb_vma_misplaced(entry, vma, ev->flags)) {
+		eb_unreserve_vma(ev);
+		err = i915_vma_unbind(vma);
+		if (err)
+			return err;
+	}
+
 	err = i915_vma_pin(vma,
 			   entry->pad_to_size, entry->alignment,
 			   pin_flags);
@@ -643,7 +636,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
 			if (err)
 				break;
 		}
-		if (err != -ENOSPC)
+		if (!(err == -ENOSPC || err == -EAGAIN))
 			return err;
 
 		/* Resort *all* the objects into priority order */
@@ -673,6 +666,11 @@ static int eb_reserve(struct i915_execbuffer *eb)
 		}
 		list_splice_tail(&last, &eb->unbound);
 
+		if (err == -EAGAIN) {
+			flush_workqueue(eb->i915->mm.userptr_wq);
+			continue;
+		}
+
 		switch (pass++) {
 		case 0:
 			break;
@@ -726,17 +724,14 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
 	unsigned int i, batch;
 	int err;
 
+	if (unlikely(i915_gem_context_is_closed(eb->gem_context)))
+		return -ENOENT;
+
 	INIT_LIST_HEAD(&eb->relocs);
 	INIT_LIST_HEAD(&eb->unbound);
 
 	batch = eb_batch_index(eb);
 
-	mutex_lock(&eb->gem_context->mutex);
-	if (unlikely(i915_gem_context_is_closed(eb->gem_context))) {
-		err = -ENOENT;
-		goto err_ctx;
-	}
-
 	for (i = 0; i < eb->buffer_count; i++) {
 		u32 handle = eb->exec[i].handle;
 		struct i915_lut_handle *lut;
@@ -781,25 +776,19 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
 		i915_gem_object_unlock(obj);
 
 add_vma:
-		err = eb_add_vma(eb, i, batch, vma);
+		err = eb_validate_vma(eb, &eb->exec[i], vma);
 		if (unlikely(err))
 			goto err_vma;
 
-		GEM_BUG_ON(drm_mm_node_allocated(&vma->node) &&
-			   eb_vma_misplaced(&eb->exec[i], vma, eb->vma[i].flags));
+		eb_add_vma(eb, i, batch, vma);
 	}
 
-	mutex_unlock(&eb->gem_context->mutex);
-
-	eb->args->flags |= __EXEC_VALIDATED;
-	return eb_reserve(eb);
+	return 0;
 
 err_obj:
 	i915_gem_object_put(obj);
 err_vma:
 	eb->vma[i].vma = NULL;
-err_ctx:
-	mutex_unlock(&eb->gem_context->mutex);
 	return err;
 }
 
@@ -840,19 +829,10 @@ static void eb_release_vmas(const struct i915_execbuffer *eb)
 		if (ev->flags & __EXEC_OBJECT_HAS_PIN)
 			__eb_unreserve_vma(vma, ev->flags);
 
-		if (ev->flags & __EXEC_OBJECT_HAS_REF)
-			i915_vma_put(vma);
+		i915_vma_put(vma);
 	}
 }
 
-static void eb_reset_vmas(const struct i915_execbuffer *eb)
-{
-	eb_release_vmas(eb);
-	if (eb->lut_size > 0)
-		memset(eb->buckets, 0,
-		       sizeof(struct hlist_head) << eb->lut_size);
-}
-
 static void eb_destroy(const struct i915_execbuffer *eb)
 {
 	GEM_BUG_ON(eb->reloc_cache.rq);
@@ -1661,8 +1641,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
 		goto out;
 	}
 
-	/* We may process another execbuffer during the unlock... */
-	eb_reset_vmas(eb);
 	mutex_unlock(&dev->struct_mutex);
 
 	/*
@@ -1701,11 +1679,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
 		goto out;
 	}
 
-	/* reacquire the objects */
-	err = eb_lookup_vmas(eb);
-	if (err)
-		goto err;
-
 	GEM_BUG_ON(!eb->batch);
 
 	list_for_each_entry(ev, &eb->relocs, reloc_link) {
@@ -1756,8 +1729,17 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
 
 static int eb_relocate(struct i915_execbuffer *eb)
 {
-	if (eb_lookup_vmas(eb))
-		goto slow;
+	int err;
+
+	mutex_lock(&eb->gem_context->mutex);
+	err = eb_lookup_vmas(eb);
+	mutex_unlock(&eb->gem_context->mutex);
+	if (err)
+		return err;
+
+	err = eb_reserve(eb);
+	if (err)
+		return err;
 
 	/* The objects are in their final locations, apply the relocations. */
 	if (eb->args->flags & __EXEC_HAS_RELOC) {
@@ -1765,14 +1747,11 @@ static int eb_relocate(struct i915_execbuffer *eb)
 
 		list_for_each_entry(ev, &eb->relocs, reloc_link) {
 			if (eb_relocate_vma(eb, ev))
-				goto slow;
+				return eb_relocate_slow(eb);
 		}
 	}
 
 	return 0;
-
-slow:
-	return eb_relocate_slow(eb);
 }
 
 static int eb_move_to_gpu(struct i915_execbuffer *eb)
@@ -1854,8 +1833,7 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
 		i915_vma_unlock(vma);
 
 		__eb_unreserve_vma(vma, flags);
-		if (unlikely(flags & __EXEC_OBJECT_HAS_REF))
-			i915_vma_put(vma);
+		i915_vma_put(vma);
 
 		ev->vma = NULL;
 	}
@@ -2115,8 +2093,7 @@ static int eb_parse(struct i915_execbuffer *eb)
 		goto err_trampoline;
 
 	eb->vma[eb->buffer_count].vma = i915_vma_get(shadow);
-	eb->vma[eb->buffer_count].flags =
-		__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_REF;
+	eb->vma[eb->buffer_count].flags = __EXEC_OBJECT_HAS_PIN;
 	eb->batch = &eb->vma[eb->buffer_count++];
 
 	eb->trampoline = trampoline;
-- 
2.25.1

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Re: [Intel-gfx] [PATCH] drm/i915/gem: Only call eb_lookup_vma once during execbuf ioctl

[Maarten Lankhorst]

Op 21-02-2020 om 14:15 schreef Chris Wilson:
> As we no longer stash anything inside i915_vma under the exclusive
> protection of struct_mutex, we do not need to revoke the i915_vma
> stashes before dropping struct_mutex to handle pagefaults. Knowing that
> we must drop the struct_mutex while keeping the eb->vma around, means
> that we are required to hold onto to the object reference until we have
> marked the vma as active.
>
> Fixes: 155ab8836caa ("drm/i915: Move object close under its own lock")
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 109 +++++++-----------
>  1 file changed, 43 insertions(+), 66 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index 3ccd3a096486..e4e50155145e 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -48,17 +48,15 @@ enum {
>  #define DBG_FORCE_RELOC 0 /* choose one of the above! */
>  };
>  
> -#define __EXEC_OBJECT_HAS_REF		BIT(31)
> -#define __EXEC_OBJECT_HAS_PIN		BIT(30)
> -#define __EXEC_OBJECT_HAS_FENCE		BIT(29)
> -#define __EXEC_OBJECT_NEEDS_MAP		BIT(28)
> -#define __EXEC_OBJECT_NEEDS_BIAS	BIT(27)
> -#define __EXEC_OBJECT_INTERNAL_FLAGS	(~0u << 27) /* all of the above */
> +#define __EXEC_OBJECT_HAS_PIN		BIT(31)
> +#define __EXEC_OBJECT_HAS_FENCE		BIT(30)
> +#define __EXEC_OBJECT_NEEDS_MAP		BIT(29)
> +#define __EXEC_OBJECT_NEEDS_BIAS	BIT(28)
> +#define __EXEC_OBJECT_INTERNAL_FLAGS	(~0u << 28) /* all of the above */
>  #define __EXEC_OBJECT_RESERVED (__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_FENCE)
>  
>  #define __EXEC_HAS_RELOC	BIT(31)
> -#define __EXEC_VALIDATED	BIT(30)
> -#define __EXEC_INTERNAL_FLAGS	(~0u << 30)
> +#define __EXEC_INTERNAL_FLAGS	(~0u << 31)
>  #define UPDATE			PIN_OFFSET_FIXED
>  
>  #define BATCH_OFFSET_BIAS (256*1024)
> @@ -473,24 +471,17 @@ eb_validate_vma(struct i915_execbuffer *eb,
>  	return 0;
>  }
>  
> -static int
> +static void
>  eb_add_vma(struct i915_execbuffer *eb,
>  	   unsigned int i, unsigned batch_idx,
>  	   struct i915_vma *vma)
>  {
>  	struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
>  	struct eb_vma *ev = &eb->vma[i];
> -	int err;
>  
>  	GEM_BUG_ON(i915_vma_is_closed(vma));
>  
> -	if (!(eb->args->flags & __EXEC_VALIDATED)) {
> -		err = eb_validate_vma(eb, entry, vma);
> -		if (unlikely(err))
> -			return err;
> -	}
> -
> -	ev->vma = vma;
> +	ev->vma = i915_vma_get(vma);
>  	ev->exec = entry;
>  	ev->flags = entry->flags;
>  
> @@ -523,20 +514,14 @@ eb_add_vma(struct i915_execbuffer *eb,
>  		eb->batch = ev;
>  	}
>  
> -	err = 0;
>  	if (eb_pin_vma(eb, entry, ev)) {
>  		if (entry->offset != vma->node.start) {
>  			entry->offset = vma->node.start | UPDATE;
>  			eb->args->flags |= __EXEC_HAS_RELOC;
>  		}
>  	} else {
> -		eb_unreserve_vma(ev);
> -
>  		list_add_tail(&ev->bind_link, &eb->unbound);
> -		if (drm_mm_node_allocated(&vma->node))
> -			err = i915_vma_unbind(vma);
>  	}
> -	return err;
>  }
>  
>  static inline int use_cpu_reloc(const struct reloc_cache *cache,
> @@ -585,6 +570,14 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb, struct eb_vma *ev)
>  		pin_flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
>  	}
>  
> +	if (drm_mm_node_allocated(&vma->node) &&
> +	    eb_vma_misplaced(entry, vma, ev->flags)) {
> +		eb_unreserve_vma(ev);
> +		err = i915_vma_unbind(vma);
> +		if (err)
> +			return err;
> +	}
> +
>  	err = i915_vma_pin(vma,
>  			   entry->pad_to_size, entry->alignment,
>  			   pin_flags);
> @@ -643,7 +636,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
>  			if (err)
>  				break;
>  		}
> -		if (err != -ENOSPC)
> +		if (!(err == -ENOSPC || err == -EAGAIN))
>  			return err;
>  
>  		/* Resort *all* the objects into priority order */
> @@ -673,6 +666,11 @@ static int eb_reserve(struct i915_execbuffer *eb)
>  		}
>  		list_splice_tail(&last, &eb->unbound);
>  
> +		if (err == -EAGAIN) {
> +			flush_workqueue(eb->i915->mm.userptr_wq);
> +			continue;
> +		}
> +
>  		switch (pass++) {
>  		case 0:
>  			break;
> @@ -726,17 +724,14 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
>  	unsigned int i, batch;
>  	int err;
>  
> +	if (unlikely(i915_gem_context_is_closed(eb->gem_context)))
> +		return -ENOENT;
> +
>  	INIT_LIST_HEAD(&eb->relocs);
>  	INIT_LIST_HEAD(&eb->unbound);
>  
>  	batch = eb_batch_index(eb);
>  
> -	mutex_lock(&eb->gem_context->mutex);
> -	if (unlikely(i915_gem_context_is_closed(eb->gem_context))) {
> -		err = -ENOENT;
> -		goto err_ctx;
> -	}
> -
>  	for (i = 0; i < eb->buffer_count; i++) {
>  		u32 handle = eb->exec[i].handle;
>  		struct i915_lut_handle *lut;
> @@ -781,25 +776,19 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
>  		i915_gem_object_unlock(obj);
>  
>  add_vma:
> -		err = eb_add_vma(eb, i, batch, vma);
> +		err = eb_validate_vma(eb, &eb->exec[i], vma);
>  		if (unlikely(err))
>  			goto err_vma;
>  
> -		GEM_BUG_ON(drm_mm_node_allocated(&vma->node) &&
> -			   eb_vma_misplaced(&eb->exec[i], vma, eb->vma[i].flags));
> +		eb_add_vma(eb, i, batch, vma);
>  	}
>  
> -	mutex_unlock(&eb->gem_context->mutex);
> -
> -	eb->args->flags |= __EXEC_VALIDATED;
> -	return eb_reserve(eb);
> +	return 0;
>  
>  err_obj:
>  	i915_gem_object_put(obj);
>  err_vma:
>  	eb->vma[i].vma = NULL;
> -err_ctx:
> -	mutex_unlock(&eb->gem_context->mutex);
>  	return err;
>  }
>  
> @@ -840,19 +829,10 @@ static void eb_release_vmas(const struct i915_execbuffer *eb)
>  		if (ev->flags & __EXEC_OBJECT_HAS_PIN)
>  			__eb_unreserve_vma(vma, ev->flags);
>  
> -		if (ev->flags & __EXEC_OBJECT_HAS_REF)
> -			i915_vma_put(vma);
> +		i915_vma_put(vma);
>  	}
>  }
>  
> -static void eb_reset_vmas(const struct i915_execbuffer *eb)
> -{
> -	eb_release_vmas(eb);
> -	if (eb->lut_size > 0)
> -		memset(eb->buckets, 0,
> -		       sizeof(struct hlist_head) << eb->lut_size);
> -}
> -
>  static void eb_destroy(const struct i915_execbuffer *eb)
>  {
>  	GEM_BUG_ON(eb->reloc_cache.rq);
> @@ -1661,8 +1641,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
>  		goto out;
>  	}
>  
> -	/* We may process another execbuffer during the unlock... */
> -	eb_reset_vmas(eb);
>  	mutex_unlock(&dev->struct_mutex);
>  
>  	/*
> @@ -1701,11 +1679,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
>  		goto out;
>  	}
>  
> -	/* reacquire the objects */
> -	err = eb_lookup_vmas(eb);
> -	if (err)
> -		goto err;
> -
>  	GEM_BUG_ON(!eb->batch);
>  
>  	list_for_each_entry(ev, &eb->relocs, reloc_link) {
> @@ -1756,8 +1729,17 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
>  
>  static int eb_relocate(struct i915_execbuffer *eb)
>  {
> -	if (eb_lookup_vmas(eb))
> -		goto slow;
> +	int err;
> +
> +	mutex_lock(&eb->gem_context->mutex);
> +	err = eb_lookup_vmas(eb);
> +	mutex_unlock(&eb->gem_context->mutex);
> +	if (err)
> +		return err;
> +
> +	err = eb_reserve(eb);
> +	if (err)
> +		return err;
>  
>  	/* The objects are in their final locations, apply the relocations. */
>  	if (eb->args->flags & __EXEC_HAS_RELOC) {
> @@ -1765,14 +1747,11 @@ static int eb_relocate(struct i915_execbuffer *eb)
>  
>  		list_for_each_entry(ev, &eb->relocs, reloc_link) {
>  			if (eb_relocate_vma(eb, ev))
> -				goto slow;
> +				return eb_relocate_slow(eb);
>  		}
>  	}
>  
>  	return 0;
> -
> -slow:
> -	return eb_relocate_slow(eb);
>  }
>  
>  static int eb_move_to_gpu(struct i915_execbuffer *eb)
> @@ -1854,8 +1833,7 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
>  		i915_vma_unlock(vma);
>  
>  		__eb_unreserve_vma(vma, flags);
> -		if (unlikely(flags & __EXEC_OBJECT_HAS_REF))
> -			i915_vma_put(vma);
> +		i915_vma_put(vma);
>  
>  		ev->vma = NULL;
>  	}
> @@ -2115,8 +2093,7 @@ static int eb_parse(struct i915_execbuffer *eb)
>  		goto err_trampoline;
>  
>  	eb->vma[eb->buffer_count].vma = i915_vma_get(shadow);
> -	eb->vma[eb->buffer_count].flags =
> -		__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_REF;
> +	eb->vma[eb->buffer_count].flags = __EXEC_OBJECT_HAS_PIN;
>  	eb->batch = &eb->vma[eb->buffer_count++];
>  
>  	eb->trampoline = trampoline;

Did you steal this from me? :P

I Ihave a similar patch in my series..

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Re: [Intel-gfx] [PATCH] drm/i915/gem: Only call eb_lookup_vma once during execbuf ioctl

[Chris Wilson]

Quoting Maarten Lankhorst (2020-02-21 13:31:44)
> Op 21-02-2020 om 14:15 schreef Chris Wilson:
> > As we no longer stash anything inside i915_vma under the exclusive
> > protection of struct_mutex, we do not need to revoke the i915_vma
> > stashes before dropping struct_mutex to handle pagefaults. Knowing that
> > we must drop the struct_mutex while keeping the eb->vma around, means
> > that we are required to hold onto to the object reference until we have
> > marked the vma as active.
> >
> > Fixes: 155ab8836caa ("drm/i915: Move object close under its own lock")
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > ---
> >  .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 109 +++++++-----------
> >  1 file changed, 43 insertions(+), 66 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > index 3ccd3a096486..e4e50155145e 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> > @@ -48,17 +48,15 @@ enum {
> >  #define DBG_FORCE_RELOC 0 /* choose one of the above! */
> >  };
> >  
> > -#define __EXEC_OBJECT_HAS_REF                BIT(31)
> > -#define __EXEC_OBJECT_HAS_PIN                BIT(30)
> > -#define __EXEC_OBJECT_HAS_FENCE              BIT(29)
> > -#define __EXEC_OBJECT_NEEDS_MAP              BIT(28)
> > -#define __EXEC_OBJECT_NEEDS_BIAS     BIT(27)
> > -#define __EXEC_OBJECT_INTERNAL_FLAGS (~0u << 27) /* all of the above */
> > +#define __EXEC_OBJECT_HAS_PIN                BIT(31)
> > +#define __EXEC_OBJECT_HAS_FENCE              BIT(30)
> > +#define __EXEC_OBJECT_NEEDS_MAP              BIT(29)
> > +#define __EXEC_OBJECT_NEEDS_BIAS     BIT(28)
> > +#define __EXEC_OBJECT_INTERNAL_FLAGS (~0u << 28) /* all of the above */
> >  #define __EXEC_OBJECT_RESERVED (__EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_FENCE)
> >  
> >  #define __EXEC_HAS_RELOC     BIT(31)
> > -#define __EXEC_VALIDATED     BIT(30)
> > -#define __EXEC_INTERNAL_FLAGS        (~0u << 30)
> > +#define __EXEC_INTERNAL_FLAGS        (~0u << 31)
> >  #define UPDATE                       PIN_OFFSET_FIXED
> >  
> >  #define BATCH_OFFSET_BIAS (256*1024)
> > @@ -473,24 +471,17 @@ eb_validate_vma(struct i915_execbuffer *eb,
> >       return 0;
> >  }
> >  
> > -static int
> > +static void
> >  eb_add_vma(struct i915_execbuffer *eb,
> >          unsigned int i, unsigned batch_idx,
> >          struct i915_vma *vma)
> >  {
> >       struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
> >       struct eb_vma *ev = &eb->vma[i];
> > -     int err;
> >  
> >       GEM_BUG_ON(i915_vma_is_closed(vma));
> >  
> > -     if (!(eb->args->flags & __EXEC_VALIDATED)) {
> > -             err = eb_validate_vma(eb, entry, vma);
> > -             if (unlikely(err))
> > -                     return err;
> > -     }
> > -
> > -     ev->vma = vma;
> > +     ev->vma = i915_vma_get(vma);
> >       ev->exec = entry;
> >       ev->flags = entry->flags;
> >  
> > @@ -523,20 +514,14 @@ eb_add_vma(struct i915_execbuffer *eb,
> >               eb->batch = ev;
> >       }
> >  
> > -     err = 0;
> >       if (eb_pin_vma(eb, entry, ev)) {
> >               if (entry->offset != vma->node.start) {
> >                       entry->offset = vma->node.start | UPDATE;
> >                       eb->args->flags |= __EXEC_HAS_RELOC;
> >               }
> >       } else {
> > -             eb_unreserve_vma(ev);
> > -
> >               list_add_tail(&ev->bind_link, &eb->unbound);
> > -             if (drm_mm_node_allocated(&vma->node))
> > -                     err = i915_vma_unbind(vma);
> >       }
> > -     return err;
> >  }
> >  
> >  static inline int use_cpu_reloc(const struct reloc_cache *cache,
> > @@ -585,6 +570,14 @@ static int eb_reserve_vma(const struct i915_execbuffer *eb, struct eb_vma *ev)
> >               pin_flags |= BATCH_OFFSET_BIAS | PIN_OFFSET_BIAS;
> >       }
> >  
> > +     if (drm_mm_node_allocated(&vma->node) &&
> > +         eb_vma_misplaced(entry, vma, ev->flags)) {
> > +             eb_unreserve_vma(ev);
> > +             err = i915_vma_unbind(vma);
> > +             if (err)
> > +                     return err;
> > +     }
> > +
> >       err = i915_vma_pin(vma,
> >                          entry->pad_to_size, entry->alignment,
> >                          pin_flags);
> > @@ -643,7 +636,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
> >                       if (err)
> >                               break;
> >               }
> > -             if (err != -ENOSPC)
> > +             if (!(err == -ENOSPC || err == -EAGAIN))
> >                       return err;
> >  
> >               /* Resort *all* the objects into priority order */
> > @@ -673,6 +666,11 @@ static int eb_reserve(struct i915_execbuffer *eb)
> >               }
> >               list_splice_tail(&last, &eb->unbound);
> >  
> > +             if (err == -EAGAIN) {
> > +                     flush_workqueue(eb->i915->mm.userptr_wq);
> > +                     continue;
> > +             }
> > +
> >               switch (pass++) {
> >               case 0:
> >                       break;
> > @@ -726,17 +724,14 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
> >       unsigned int i, batch;
> >       int err;
> >  
> > +     if (unlikely(i915_gem_context_is_closed(eb->gem_context)))
> > +             return -ENOENT;
> > +
> >       INIT_LIST_HEAD(&eb->relocs);
> >       INIT_LIST_HEAD(&eb->unbound);
> >  
> >       batch = eb_batch_index(eb);
> >  
> > -     mutex_lock(&eb->gem_context->mutex);
> > -     if (unlikely(i915_gem_context_is_closed(eb->gem_context))) {
> > -             err = -ENOENT;
> > -             goto err_ctx;
> > -     }
> > -
> >       for (i = 0; i < eb->buffer_count; i++) {
> >               u32 handle = eb->exec[i].handle;
> >               struct i915_lut_handle *lut;
> > @@ -781,25 +776,19 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
> >               i915_gem_object_unlock(obj);
> >  
> >  add_vma:
> > -             err = eb_add_vma(eb, i, batch, vma);
> > +             err = eb_validate_vma(eb, &eb->exec[i], vma);
> >               if (unlikely(err))
> >                       goto err_vma;
> >  
> > -             GEM_BUG_ON(drm_mm_node_allocated(&vma->node) &&
> > -                        eb_vma_misplaced(&eb->exec[i], vma, eb->vma[i].flags));
> > +             eb_add_vma(eb, i, batch, vma);
> >       }
> >  
> > -     mutex_unlock(&eb->gem_context->mutex);
> > -
> > -     eb->args->flags |= __EXEC_VALIDATED;
> > -     return eb_reserve(eb);
> > +     return 0;
> >  
> >  err_obj:
> >       i915_gem_object_put(obj);
> >  err_vma:
> >       eb->vma[i].vma = NULL;
> > -err_ctx:
> > -     mutex_unlock(&eb->gem_context->mutex);
> >       return err;
> >  }
> >  
> > @@ -840,19 +829,10 @@ static void eb_release_vmas(const struct i915_execbuffer *eb)
> >               if (ev->flags & __EXEC_OBJECT_HAS_PIN)
> >                       __eb_unreserve_vma(vma, ev->flags);
> >  
> > -             if (ev->flags & __EXEC_OBJECT_HAS_REF)
> > -                     i915_vma_put(vma);
> > +             i915_vma_put(vma);
> >       }
> >  }
> >  
> > -static void eb_reset_vmas(const struct i915_execbuffer *eb)
> > -{
> > -     eb_release_vmas(eb);
> > -     if (eb->lut_size > 0)
> > -             memset(eb->buckets, 0,
> > -                    sizeof(struct hlist_head) << eb->lut_size);
> > -}
> > -
> >  static void eb_destroy(const struct i915_execbuffer *eb)
> >  {
> >       GEM_BUG_ON(eb->reloc_cache.rq);
> > @@ -1661,8 +1641,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
> >               goto out;
> >       }
> >  
> > -     /* We may process another execbuffer during the unlock... */
> > -     eb_reset_vmas(eb);
> >       mutex_unlock(&dev->struct_mutex);
> >  
> >       /*
> > @@ -1701,11 +1679,6 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
> >               goto out;
> >       }
> >  
> > -     /* reacquire the objects */
> > -     err = eb_lookup_vmas(eb);
> > -     if (err)
> > -             goto err;
> > -
> >       GEM_BUG_ON(!eb->batch);
> >  
> >       list_for_each_entry(ev, &eb->relocs, reloc_link) {
> > @@ -1756,8 +1729,17 @@ static noinline int eb_relocate_slow(struct i915_execbuffer *eb)
> >  
> >  static int eb_relocate(struct i915_execbuffer *eb)
> >  {
> > -     if (eb_lookup_vmas(eb))
> > -             goto slow;
> > +     int err;
> > +
> > +     mutex_lock(&eb->gem_context->mutex);
> > +     err = eb_lookup_vmas(eb);
> > +     mutex_unlock(&eb->gem_context->mutex);
> > +     if (err)
> > +             return err;
> > +
> > +     err = eb_reserve(eb);
> > +     if (err)
> > +             return err;
> >  
> >       /* The objects are in their final locations, apply the relocations. */
> >       if (eb->args->flags & __EXEC_HAS_RELOC) {
> > @@ -1765,14 +1747,11 @@ static int eb_relocate(struct i915_execbuffer *eb)
> >  
> >               list_for_each_entry(ev, &eb->relocs, reloc_link) {
> >                       if (eb_relocate_vma(eb, ev))
> > -                             goto slow;
> > +                             return eb_relocate_slow(eb);
> >               }
> >       }
> >  
> >       return 0;
> > -
> > -slow:
> > -     return eb_relocate_slow(eb);
> >  }
> >  
> >  static int eb_move_to_gpu(struct i915_execbuffer *eb)
> > @@ -1854,8 +1833,7 @@ static int eb_move_to_gpu(struct i915_execbuffer *eb)
> >               i915_vma_unlock(vma);
> >  
> >               __eb_unreserve_vma(vma, flags);
> > -             if (unlikely(flags & __EXEC_OBJECT_HAS_REF))
> > -                     i915_vma_put(vma);
> > +             i915_vma_put(vma);
> >  
> >               ev->vma = NULL;
> >       }
> > @@ -2115,8 +2093,7 @@ static int eb_parse(struct i915_execbuffer *eb)
> >               goto err_trampoline;
> >  
> >       eb->vma[eb->buffer_count].vma = i915_vma_get(shadow);
> > -     eb->vma[eb->buffer_count].flags =
> > -             __EXEC_OBJECT_HAS_PIN | __EXEC_OBJECT_HAS_REF;
> > +     eb->vma[eb->buffer_count].flags = __EXEC_OBJECT_HAS_PIN;
> >       eb->batch = &eb->vma[eb->buffer_count++];
> >  
> >       eb->trampoline = trampoline;
> 
> Did you steal this from me? :P

It was in the series that removes struct_mutex. I think we should just
remove struct_mutex right away so that we have parallel execbuf as a
baseline.
-Chris
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[Intel-gfx] ✗ Fi.CI.BUILD: failure for series starting with [1/3] drm/i915: Flush idle barriers when waiting (rev2)

[Patchwork]

== Series Details ==

Series: series starting with [1/3] drm/i915: Flush idle barriers when waiting (rev2)
URL   : https://patchwork.freedesktop.org/series/73751/
State : failure

== Summary ==

Applying: drm/i915: Flush idle barriers when waiting
Applying: drm/i915: Allow userspace to specify ringsize on construction
Applying: drm/i915/gem: Only call eb_lookup_vma once during execbuf ioctl
Using index info to reconstruct a base tree...
M	drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
Falling back to patching base and 3-way merge...
Auto-merging drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch' to see the failed patch
Patch failed at 0003 drm/i915/gem: Only call eb_lookup_vma once during execbuf ioctl
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

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[Intel-gfx] [PATCH 3/3] drm/i915/gem: Honour O_NONBLOCK before throttling execbuf submissions

[Chris Wilson]

Check the user's flags on the struct file before deciding whether or not
to stall before submitting a request. This allows us to reasonably
cheaply honour O_NONBLOCK without checking at more critical phases
during request submission.

Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 21 ++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index f0998f1225af..8da95772c8f2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2249,15 +2249,22 @@ static int __eb_pin_engine(struct i915_execbuffer *eb, struct intel_context *ce)
 	intel_context_timeline_unlock(tl);
 
 	if (rq) {
-		if (i915_request_wait(rq,
-				      I915_WAIT_INTERRUPTIBLE,
-				      MAX_SCHEDULE_TIMEOUT) < 0) {
-			i915_request_put(rq);
-			err = -EINTR;
-			goto err_exit;
-		}
+		bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
+		long timeout;
+
+		timeout = MAX_SCHEDULE_TIMEOUT;
+		if (nonblock)
+			timeout = 0;
 
+		timeout = i915_request_wait(rq,
+					    I915_WAIT_INTERRUPTIBLE,
+					    timeout);
 		i915_request_put(rq);
+
+		if (timeout < 0) {
+			err = nonblock ? -EWOULDBLOCK : timeout;
+			goto err_exit;
+		}
 	}
 
 	eb->engine = ce->engine;
-- 
2.24.0

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