[PATCH 38/46] drm/i915: Allow a context to define its set of engines

[Chris Wilson <chris@chris-wilson.co.uk>]

Over the last few years, we have debated how to extend the user API to
support an increase in the number of engines, that may be sparse and
even be heterogeneous within a class (not all video decoders created
equal). We settled on using (class, instance) tuples to identify a
specific engine, with an API for the user to construct a map of engines
to capabilities. Into this picture, we then add a challenge of virtual
engines; one user engine that maps behind the scenes to any number of
physical engines. To keep it general, we want the user to have full
control over that mapping. To that end, we allow the user to constrain a
context to define the set of engines that it can access, order fully
controlled by the user via (class, instance). With such precise control
in context setup, we can continue to use the existing execbuf uABI of
specifying a single index; only now it doesn't automagically map onto
the engines, it uses the user defined engine map from the context.

The I915_EXEC_DEFAULT slot is left empty, and invalid for use by
execbuf. It's use will be revealed in the next patch.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem_context.c    | 184 ++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_gem_context.h    |   4 +
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |  22 ++-
 include/uapi/drm/i915_drm.h                |  32 ++++
 4 files changed, 230 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 2e2de0532c08..ad8052235f37 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -95,6 +95,21 @@
 
 #define ALL_L3_SLICES(dev) (1 << NUM_L3_SLICES(dev)) - 1
 
+static struct intel_engine_cs *
+lookup_user_engine(struct i915_gem_context *ctx,
+		   unsigned long flags, u16 class, u16 instance)
+#define LOOKUP_USER_INDEX BIT(0)
+{
+	if (flags & LOOKUP_USER_INDEX) {
+		if (instance >= ctx->nengine)
+			return NULL;
+
+		return ctx->engines[instance];
+	}
+
+	return intel_engine_lookup_user(ctx->i915, class, instance);
+}
+
 static void lut_close(struct i915_gem_context *ctx)
 {
 	struct i915_lut_handle *lut, *ln;
@@ -218,6 +233,8 @@ static void i915_gem_context_free(struct i915_gem_context *ctx)
 	release_hw_id(ctx);
 	i915_ppgtt_put(ctx->ppgtt);
 
+	kfree(ctx->engines);
+
 	for (n = 0; n < ARRAY_SIZE(ctx->__engine); n++) {
 		struct intel_context *ce = &ctx->__engine[n];
 
@@ -1317,9 +1334,9 @@ static int set_sseu(struct i915_gem_context *ctx,
 	if (user_sseu.flags || user_sseu.rsvd)
 		return -EINVAL;
 
-	engine = intel_engine_lookup_user(i915,
-					  user_sseu.engine_class,
-					  user_sseu.engine_instance);
+	engine = lookup_user_engine(ctx, 0,
+				    user_sseu.engine_class,
+				    user_sseu.engine_instance);
 	if (!engine)
 		return -EINVAL;
 
@@ -1337,9 +1354,156 @@ static int set_sseu(struct i915_gem_context *ctx,
 
 	args->size = sizeof(user_sseu);
 
+	return 0;
+};
+
+struct set_engines {
+	struct i915_gem_context *ctx;
+	struct intel_engine_cs **engines;
+	unsigned int nengine;
+};
+
+static const i915_user_extension_fn set_engines__extensions[] = {
+};
+
+static int
+set_engines(struct i915_gem_context *ctx,
+	    const struct drm_i915_gem_context_param *args)
+{
+	struct i915_context_param_engines __user *user;
+	struct set_engines set = { .ctx = ctx };
+	u64 size, extensions;
+	unsigned int n;
+	int err;
+
+	user = u64_to_user_ptr(args->value);
+	size = args->size;
+	if (!size)
+		goto out;
+
+	BUILD_BUG_ON(!IS_ALIGNED(sizeof(*user), sizeof(*user->class_instance)));
+	if (size < sizeof(*user) || size % sizeof(*user->class_instance))
+		return -EINVAL;
+
+	set.nengine = (size - sizeof(*user)) / sizeof(*user->class_instance);
+	if (set.nengine == 0 || set.nengine > I915_EXEC_RING_MASK)
+		return -EINVAL;
+
+	set.engines = kmalloc_array(set.nengine,
+				    sizeof(*set.engines),
+				    GFP_KERNEL);
+	if (!set.engines)
+		return -ENOMEM;
+
+	for (n = 0; n < set.nengine; n++) {
+		u16 class, inst;
+
+		if (get_user(class, &user->class_instance[n].engine_class) ||
+		    get_user(inst, &user->class_instance[n].engine_instance)) {
+			kfree(set.engines);
+			return -EFAULT;
+		}
+
+		if (class == (u16)I915_ENGINE_CLASS_INVALID &&
+		    inst == (u16)I915_ENGINE_CLASS_INVALID_NONE) {
+			set.engines[n] = NULL;
+			continue;
+		}
+
+		set.engines[n] = lookup_user_engine(ctx, 0, class, inst);
+		if (!set.engines[n]) {
+			kfree(set.engines);
+			return -ENOENT;
+		}
+	}
+
+	err = -EFAULT;
+	if (!get_user(extensions, &user->extensions))
+		err = i915_user_extensions(u64_to_user_ptr(extensions),
+					   set_engines__extensions,
+					   ARRAY_SIZE(set_engines__extensions),
+					   &set);
+	if (err) {
+		kfree(set.engines);
+		return err;
+	}
+
+out:
+	mutex_lock(&ctx->i915->drm.struct_mutex);
+	kfree(ctx->engines);
+	ctx->engines = set.engines;
+	ctx->nengine = set.nengine;
+	mutex_unlock(&ctx->i915->drm.struct_mutex);
+
 	return 0;
 }
 
+static int
+get_engines(struct i915_gem_context *ctx,
+	    struct drm_i915_gem_context_param *args)
+{
+	struct i915_context_param_engines *local;
+	unsigned int n, count, size;
+	int err;
+
+restart:
+	count = READ_ONCE(ctx->nengine);
+	if (count > (INT_MAX - sizeof(*local)) / sizeof(*local->class_instance))
+		return -ENOMEM; /* unrepresentable! */
+
+	size = sizeof(*local) + count * sizeof(*local->class_instance);
+	if (!args->size) {
+		args->size = size;
+		return 0;
+	}
+	if (args->size < size)
+		return -EINVAL;
+
+	local = kmalloc(size, GFP_KERNEL);
+	if (!local)
+		return -ENOMEM;
+
+	if (mutex_lock_interruptible(&ctx->i915->drm.struct_mutex)) {
+		err = -EINTR;
+		goto err;
+	}
+
+	if (READ_ONCE(ctx->nengine) != count) {
+		mutex_unlock(&ctx->i915->drm.struct_mutex);
+		kfree(local);
+		goto restart;
+	}
+
+	local->extensions = 0;
+	for (n = 0; n < count; n++) {
+		if (ctx->engines[n]) {
+			local->class_instance[n].engine_class =
+				ctx->engines[n]->uabi_class;
+			local->class_instance[n].engine_instance =
+				ctx->engines[n]->instance;
+		} else {
+			local->class_instance[n].engine_class =
+				I915_ENGINE_CLASS_INVALID;
+			local->class_instance[n].engine_instance =
+				I915_ENGINE_CLASS_INVALID_NONE;
+		}
+	}
+
+	mutex_unlock(&ctx->i915->drm.struct_mutex);
+
+	if (copy_to_user(u64_to_user_ptr(args->value), local, size)) {
+		err = -EFAULT;
+		goto err;
+	}
+
+	args->size = size;
+	return 0;
+
+err:
+	kfree(local);
+	return err;
+}
+
 static int ctx_setparam(struct i915_gem_context *ctx,
 			struct drm_i915_gem_context_param *args)
 {
@@ -1403,6 +1567,10 @@ static int ctx_setparam(struct i915_gem_context *ctx,
 		ret = set_ppgtt(ctx, args);
 		break;
 
+	case I915_CONTEXT_PARAM_ENGINES:
+		ret = set_engines(ctx, args);
+		break;
+
 	case I915_CONTEXT_PARAM_BAN_PERIOD:
 	default:
 		ret = -EINVAL;
@@ -1535,9 +1703,9 @@ static int get_sseu(struct i915_gem_context *ctx,
 	if (user_sseu.flags || user_sseu.rsvd)
 		return -EINVAL;
 
-	engine = intel_engine_lookup_user(ctx->i915,
-					  user_sseu.engine_class,
-					  user_sseu.engine_instance);
+	engine = lookup_user_engine(ctx, 0,
+				    user_sseu.engine_class,
+				    user_sseu.engine_instance);
 	if (!engine)
 		return -EINVAL;
 
@@ -1616,6 +1784,10 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 		ret = get_ppgtt(ctx, args);
 		break;
 
+	case I915_CONTEXT_PARAM_ENGINES:
+		ret = get_engines(ctx, args);
+		break;
+
 	case I915_CONTEXT_PARAM_BAN_PERIOD:
 	default:
 		ret = -EINVAL;
diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h
index 3bd1faabbc3f..775de1af1b10 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/i915_gem_context.h
@@ -78,6 +78,8 @@ struct i915_gem_context {
 	/** file_priv: owning file descriptor */
 	struct drm_i915_file_private *file_priv;
 
+	struct intel_engine_cs **engines;
+
 	struct i915_timeline *timeline;
 
 	/**
@@ -146,6 +148,8 @@ struct i915_gem_context {
 #define CONTEXT_CLOSED			1
 #define CONTEXT_FORCE_SINGLE_SUBMISSION	2
 
+	unsigned int nengine;
+
 	/**
 	 * @hw_id: - unique identifier for the context
 	 *
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 859625474f58..5052b49f8dcd 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -2086,13 +2086,23 @@ static const enum intel_engine_id user_ring_map[I915_USER_RINGS + 1] = {
 };
 
 static struct intel_engine_cs *
-eb_select_engine(struct drm_i915_private *dev_priv,
+eb_select_engine(struct i915_execbuffer *eb,
 		 struct drm_file *file,
 		 struct drm_i915_gem_execbuffer2 *args)
 {
 	unsigned int user_ring_id = args->flags & I915_EXEC_RING_MASK;
 	struct intel_engine_cs *engine;
 
+	if (eb->ctx->engines) {
+		if (user_ring_id >= eb->ctx->nengine) {
+			DRM_DEBUG("execbuf with unknown ring: %u\n",
+				  user_ring_id);
+			return NULL;
+		}
+
+		return eb->ctx->engines[user_ring_id];
+	}
+
 	if (user_ring_id > I915_USER_RINGS) {
 		DRM_DEBUG("execbuf with unknown ring: %u\n", user_ring_id);
 		return NULL;
@@ -2105,11 +2115,11 @@ eb_select_engine(struct drm_i915_private *dev_priv,
 		return NULL;
 	}
 
-	if (user_ring_id == I915_EXEC_BSD && HAS_BSD2(dev_priv)) {
+	if (user_ring_id == I915_EXEC_BSD && HAS_BSD2(eb->i915)) {
 		unsigned int bsd_idx = args->flags & I915_EXEC_BSD_MASK;
 
 		if (bsd_idx == I915_EXEC_BSD_DEFAULT) {
-			bsd_idx = gen8_dispatch_bsd_engine(dev_priv, file);
+			bsd_idx = gen8_dispatch_bsd_engine(eb->i915, file);
 		} else if (bsd_idx >= I915_EXEC_BSD_RING1 &&
 			   bsd_idx <= I915_EXEC_BSD_RING2) {
 			bsd_idx >>= I915_EXEC_BSD_SHIFT;
@@ -2120,9 +2130,9 @@ eb_select_engine(struct drm_i915_private *dev_priv,
 			return NULL;
 		}
 
-		engine = dev_priv->engine[_VCS(bsd_idx)];
+		engine = eb->i915->engine[_VCS(bsd_idx)];
 	} else {
-		engine = dev_priv->engine[user_ring_map[user_ring_id]];
+		engine = eb->i915->engine[user_ring_map[user_ring_id]];
 	}
 
 	if (!engine) {
@@ -2332,7 +2342,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	if (unlikely(err))
 		goto err_destroy;
 
-	eb.engine = eb_select_engine(eb.i915, file, args);
+	eb.engine = eb_select_engine(&eb, file, args);
 	if (!eb.engine) {
 		err = -EINVAL;
 		goto err_engine;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 0c5566b2d244..eb5799fe3868 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -122,6 +122,8 @@ enum drm_i915_gem_engine_class {
 	I915_ENGINE_CLASS_INVALID	= -1
 };
 
+#define I915_ENGINE_CLASS_INVALID_NONE -1
+
 /**
  * DOC: perf_events exposed by i915 through /sys/bus/event_sources/drivers/i915
  *
@@ -1481,6 +1483,27 @@ struct drm_i915_gem_context_param {
 	 * See DRM_I915_GEM_VM_CREATE and DRM_I915_GEM_VM_DESTROY.
 	 */
 #define I915_CONTEXT_PARAM_VM		0x8
+
+/*
+ * I915_CONTEXT_PARAM_ENGINES:
+ *
+ * Bind this context to operate on this subset of available engines. Henceforth,
+ * the I915_EXEC_RING selector for DRM_IOCTL_I915_GEM_EXECBUFFER2 operates as
+ * an index into this array of engines; I915_EXEC_DEFAULT selecting engine[0]
+ * and upwards. Slots 0...N are filled in using the specified (class, instance).
+ * Use
+ *	engine_class: I915_ENGINE_CLASS_INVALID,
+ *	engine_instance: I915_ENGINE_CLASS_INVALID_NONE
+ * to specify a gap in the array that can be filled in later, e.g. by a
+ * virtual engine used for load balancing.
+ *
+ * Setting the number of engines bound to the context to 0, by passing a zero
+ * sized argument, will revert back to default settings.
+ *
+ * See struct i915_context_param_engines.
+ */
+#define I915_CONTEXT_PARAM_ENGINES	0x9
+
 	__u64 value;
 };
 
@@ -1543,6 +1566,15 @@ struct drm_i915_gem_context_param_sseu {
 	__u32 rsvd;
 };
 
+struct i915_context_param_engines {
+	__u64 extensions; /* linked chain of extension blocks, 0 terminates */
+
+	struct {
+		__u16 engine_class; /* see enum drm_i915_gem_engine_class */
+		__u16 engine_instance;
+	} class_instance[0];
+};
+
 struct drm_i915_gem_context_create_ext_setparam {
 #define I915_CONTEXT_CREATE_EXT_SETPARAM 0
 	struct i915_user_extension base;
-- 
2.20.1

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