drm/i915: Move more GEM objects under gem/

Continuing the theme of separating out the GEM clutter.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528092956.14910-8-chris@chris-wilson.co.uk

1 files changed, 0 insertions, 2474 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
deleted file mode 100644
index 5d2f8ba92b59..000000000000
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ /dev/null
@@ -1,2474 +0,0 @@
-/*
- * Copyright © 2011-2012 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:
- *    Ben Widawsky <ben@bwidawsk.net>
- *
- */
-
-/*
- * This file implements HW context support. On gen5+ a HW context consists of an
- * opaque GPU object which is referenced at times of context saves and restores.
- * With RC6 enabled, the context is also referenced as the GPU enters and exists
- * from RC6 (GPU has it's own internal power context, except on gen5). Though
- * something like a context does exist for the media ring, the code only
- * supports contexts for the render ring.
- *
- * In software, there is a distinction between contexts created by the user,
- * and the default HW context. The default HW context is used by GPU clients
- * that do not request setup of their own hardware context. The default
- * context's state is never restored to help prevent programming errors. This
- * would happen if a client ran and piggy-backed off another clients GPU state.
- * The default context only exists to give the GPU some offset to load as the
- * current to invoke a save of the context we actually care about. In fact, the
- * code could likely be constructed, albeit in a more complicated fashion, to
- * never use the default context, though that limits the driver's ability to
- * swap out, and/or destroy other contexts.
- *
- * All other contexts are created as a request by the GPU client. These contexts
- * store GPU state, and thus allow GPU clients to not re-emit state (and
- * potentially query certain state) at any time. The kernel driver makes
- * certain that the appropriate commands are inserted.
- *
- * The context life cycle is semi-complicated in that context BOs may live
- * longer than the context itself because of the way the hardware, and object
- * tracking works. Below is a very crude representation of the state machine
- * describing the context life.
- *                                         refcount     pincount     active
- * S0: initial state                          0            0           0
- * S1: context created                        1            0           0
- * S2: context is currently running           2            1           X
- * S3: GPU referenced, but not current        2            0           1
- * S4: context is current, but destroyed      1            1           0
- * S5: like S3, but destroyed                 1            0           1
- *
- * The most common (but not all) transitions:
- * S0->S1: client creates a context
- * S1->S2: client submits execbuf with context
- * S2->S3: other clients submits execbuf with context
- * S3->S1: context object was retired
- * S3->S2: clients submits another execbuf
- * S2->S4: context destroy called with current context
- * S3->S5->S0: destroy path
- * S4->S5->S0: destroy path on current context
- *
- * There are two confusing terms used above:
- *  The "current context" means the context which is currently running on the
- *  GPU. The GPU has loaded its state already and has stored away the gtt
- *  offset of the BO. The GPU is not actively referencing the data at this
- *  offset, but it will on the next context switch. The only way to avoid this
- *  is to do a GPU reset.
- *
- *  An "active context' is one which was previously the "current context" and is
- *  on the active list waiting for the next context switch to occur. Until this
- *  happens, the object must remain at the same gtt offset. It is therefore
- *  possible to destroy a context, but it is still active.
- *
- */
-
-#include <linux/log2.h>
-#include <linux/nospec.h>
-
-#include <drm/i915_drm.h>
-
-#include "gt/intel_lrc_reg.h"
-
-#include "i915_drv.h"
-#include "i915_globals.h"
-#include "i915_trace.h"
-#include "i915_user_extensions.h"
-
-#define ALL_L3_SLICES(dev) (1 << NUM_L3_SLICES(dev)) - 1
-
-static struct i915_global_gem_context {
-	struct i915_global base;
-	struct kmem_cache *slab_luts;
-} global;
-
-struct i915_lut_handle *i915_lut_handle_alloc(void)
-{
-	return kmem_cache_alloc(global.slab_luts, GFP_KERNEL);
-}
-
-void i915_lut_handle_free(struct i915_lut_handle *lut)
-{
-	return kmem_cache_free(global.slab_luts, lut);
-}
-
-static void lut_close(struct i915_gem_context *ctx)
-{
-	struct i915_lut_handle *lut, *ln;
-	struct radix_tree_iter iter;
-	void __rcu **slot;
-
-	list_for_each_entry_safe(lut, ln, &ctx->handles_list, ctx_link) {
-		list_del(&lut->obj_link);
-		i915_lut_handle_free(lut);
-	}
-	INIT_LIST_HEAD(&ctx->handles_list);
-
-	rcu_read_lock();
-	radix_tree_for_each_slot(slot, &ctx->handles_vma, &iter, 0) {
-		struct i915_vma *vma = rcu_dereference_raw(*slot);
-
-		radix_tree_iter_delete(&ctx->handles_vma, &iter, slot);
-
-		vma->open_count--;
-		__i915_gem_object_release_unless_active(vma->obj);
-	}
-	rcu_read_unlock();
-}
-
-static struct intel_context *
-lookup_user_engine(struct i915_gem_context *ctx,
-		   unsigned long flags,
-		   const struct i915_engine_class_instance *ci)
-#define LOOKUP_USER_INDEX BIT(0)
-{
-	int idx;
-
-	if (!!(flags & LOOKUP_USER_INDEX) != i915_gem_context_user_engines(ctx))
-		return ERR_PTR(-EINVAL);
-
-	if (!i915_gem_context_user_engines(ctx)) {
-		struct intel_engine_cs *engine;
-
-		engine = intel_engine_lookup_user(ctx->i915,
-						  ci->engine_class,
-						  ci->engine_instance);
-		if (!engine)
-			return ERR_PTR(-EINVAL);
-
-		idx = engine->id;
-	} else {
-		idx = ci->engine_instance;
-	}
-
-	return i915_gem_context_get_engine(ctx, idx);
-}
-
-static inline int new_hw_id(struct drm_i915_private *i915, gfp_t gfp)
-{
-	unsigned int max;
-
-	lockdep_assert_held(&i915->contexts.mutex);
-
-	if (INTEL_GEN(i915) >= 11)
-		max = GEN11_MAX_CONTEXT_HW_ID;
-	else if (USES_GUC_SUBMISSION(i915))
-		/*
-		 * When using GuC in proxy submission, GuC consumes the
-		 * highest bit in the context id to indicate proxy submission.
-		 */
-		max = MAX_GUC_CONTEXT_HW_ID;
-	else
-		max = MAX_CONTEXT_HW_ID;
-
-	return ida_simple_get(&i915->contexts.hw_ida, 0, max, gfp);
-}
-
-static int steal_hw_id(struct drm_i915_private *i915)
-{
-	struct i915_gem_context *ctx, *cn;
-	LIST_HEAD(pinned);
-	int id = -ENOSPC;
-
-	lockdep_assert_held(&i915->contexts.mutex);
-
-	list_for_each_entry_safe(ctx, cn,
-				 &i915->contexts.hw_id_list, hw_id_link) {
-		if (atomic_read(&ctx->hw_id_pin_count)) {
-			list_move_tail(&ctx->hw_id_link, &pinned);
-			continue;
-		}
-
-		GEM_BUG_ON(!ctx->hw_id); /* perma-pinned kernel context */
-		list_del_init(&ctx->hw_id_link);
-		id = ctx->hw_id;
-		break;
-	}
-
-	/*
-	 * Remember how far we got up on the last repossesion scan, so the
-	 * list is kept in a "least recently scanned" order.
-	 */
-	list_splice_tail(&pinned, &i915->contexts.hw_id_list);
-	return id;
-}
-
-static int assign_hw_id(struct drm_i915_private *i915, unsigned int *out)
-{
-	int ret;
-
-	lockdep_assert_held(&i915->contexts.mutex);
-
-	/*
-	 * We prefer to steal/stall ourselves and our users over that of the
-	 * entire system. That may be a little unfair to our users, and
-	 * even hurt high priority clients. The choice is whether to oomkill
-	 * something else, or steal a context id.
-	 */
-	ret = new_hw_id(i915, GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
-	if (unlikely(ret < 0)) {
-		ret = steal_hw_id(i915);
-		if (ret < 0) /* once again for the correct errno code */
-			ret = new_hw_id(i915, GFP_KERNEL);
-		if (ret < 0)
-			return ret;
-	}
-
-	*out = ret;
-	return 0;
-}
-
-static void release_hw_id(struct i915_gem_context *ctx)
-{
-	struct drm_i915_private *i915 = ctx->i915;
-
-	if (list_empty(&ctx->hw_id_link))
-		return;
-
-	mutex_lock(&i915->contexts.mutex);
-	if (!list_empty(&ctx->hw_id_link)) {
-		ida_simple_remove(&i915->contexts.hw_ida, ctx->hw_id);
-		list_del_init(&ctx->hw_id_link);
-	}
-	mutex_unlock(&i915->contexts.mutex);
-}
-
-static void __free_engines(struct i915_gem_engines *e, unsigned int count)
-{
-	while (count--) {
-		if (!e->engines[count])
-			continue;
-
-		intel_context_put(e->engines[count]);
-	}
-	kfree(e);
-}
-
-static void free_engines(struct i915_gem_engines *e)
-{
-	__free_engines(e, e->num_engines);
-}
-
-static void free_engines_rcu(struct work_struct *wrk)
-{
-	struct i915_gem_engines *e =
-		container_of(wrk, struct i915_gem_engines, rcu.work);
-	struct drm_i915_private *i915 = e->i915;
-
-	mutex_lock(&i915->drm.struct_mutex);
-	free_engines(e);
-	mutex_unlock(&i915->drm.struct_mutex);
-}
-
-static struct i915_gem_engines *default_engines(struct i915_gem_context *ctx)
-{
-	struct intel_engine_cs *engine;
-	struct i915_gem_engines *e;
-	enum intel_engine_id id;
-
-	e = kzalloc(struct_size(e, engines, I915_NUM_ENGINES), GFP_KERNEL);
-	if (!e)
-		return ERR_PTR(-ENOMEM);
-
-	e->i915 = ctx->i915;
-	for_each_engine(engine, ctx->i915, id) {
-		struct intel_context *ce;
-
-		ce = intel_context_create(ctx, engine);
-		if (IS_ERR(ce)) {
-			__free_engines(e, id);
-			return ERR_CAST(ce);
-		}
-
-		e->engines[id] = ce;
-	}
-	e->num_engines = id;
-
-	return e;
-}
-
-static void i915_gem_context_free(struct i915_gem_context *ctx)
-{
-	lockdep_assert_held(&ctx->i915->drm.struct_mutex);
-	GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
-
-	release_hw_id(ctx);
-	i915_ppgtt_put(ctx->ppgtt);
-
-	free_engines(rcu_access_pointer(ctx->engines));
-	mutex_destroy(&ctx->engines_mutex);
-
-	if (ctx->timeline)
-		i915_timeline_put(ctx->timeline);
-
-	kfree(ctx->name);
-	put_pid(ctx->pid);
-
-	list_del(&ctx->link);
-	mutex_destroy(&ctx->mutex);
-
-	kfree_rcu(ctx, rcu);
-}
-
-static void contexts_free(struct drm_i915_private *i915)
-{
-	struct llist_node *freed = llist_del_all(&i915->contexts.free_list);
-	struct i915_gem_context *ctx, *cn;
-
-	lockdep_assert_held(&i915->drm.struct_mutex);
-
-	llist_for_each_entry_safe(ctx, cn, freed, free_link)
-		i915_gem_context_free(ctx);
-}
-
-static void contexts_free_first(struct drm_i915_private *i915)
-{
-	struct i915_gem_context *ctx;
-	struct llist_node *freed;
-
-	lockdep_assert_held(&i915->drm.struct_mutex);
-
-	freed = llist_del_first(&i915->contexts.free_list);
-	if (!freed)
-		return;
-
-	ctx = container_of(freed, typeof(*ctx), free_link);
-	i915_gem_context_free(ctx);
-}
-
-static void contexts_free_worker(struct work_struct *work)
-{
-	struct drm_i915_private *i915 =
-		container_of(work, typeof(*i915), contexts.free_work);
-
-	mutex_lock(&i915->drm.struct_mutex);
-	contexts_free(i915);
-	mutex_unlock(&i915->drm.struct_mutex);
-}
-
-void i915_gem_context_release(struct kref *ref)
-{
-	struct i915_gem_context *ctx = container_of(ref, typeof(*ctx), ref);
-	struct drm_i915_private *i915 = ctx->i915;
-
-	trace_i915_context_free(ctx);
-	if (llist_add(&ctx->free_link, &i915->contexts.free_list))
-		queue_work(i915->wq, &i915->contexts.free_work);
-}
-
-static void context_close(struct i915_gem_context *ctx)
-{
-	i915_gem_context_set_closed(ctx);
-
-	/*
-	 * This context will never again be assinged to HW, so we can
-	 * reuse its ID for the next context.
-	 */
-	release_hw_id(ctx);
-
-	/*
-	 * The LUT uses the VMA as a backpointer to unref the object,
-	 * so we need to clear the LUT before we close all the VMA (inside
-	 * the ppgtt).
-	 */
-	lut_close(ctx);
-
-	ctx->file_priv = ERR_PTR(-EBADF);
-	i915_gem_context_put(ctx);
-}
-
-static u32 default_desc_template(const struct drm_i915_private *i915,
-				 const struct i915_hw_ppgtt *ppgtt)
-{
-	u32 address_mode;
-	u32 desc;
-
-	desc = GEN8_CTX_VALID | GEN8_CTX_PRIVILEGE;
-
-	address_mode = INTEL_LEGACY_32B_CONTEXT;
-	if (ppgtt && i915_vm_is_4lvl(&ppgtt->vm))
-		address_mode = INTEL_LEGACY_64B_CONTEXT;
-	desc |= address_mode << GEN8_CTX_ADDRESSING_MODE_SHIFT;
-
-	if (IS_GEN(i915, 8))
-		desc |= GEN8_CTX_L3LLC_COHERENT;
-
-	/* TODO: WaDisableLiteRestore when we start using semaphore
-	 * signalling between Command Streamers
-	 * ring->ctx_desc_template |= GEN8_CTX_FORCE_RESTORE;
-	 */
-
-	return desc;
-}
-
-static struct i915_gem_context *
-__create_context(struct drm_i915_private *dev_priv)
-{
-	struct i915_gem_context *ctx;
-	struct i915_gem_engines *e;
-	int err;
-	int i;
-
-	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
-	if (!ctx)
-		return ERR_PTR(-ENOMEM);
-
-	kref_init(&ctx->ref);
-	list_add_tail(&ctx->link, &dev_priv->contexts.list);
-	ctx->i915 = dev_priv;
-	ctx->sched.priority = I915_USER_PRIORITY(I915_PRIORITY_NORMAL);
-	mutex_init(&ctx->mutex);
-
-	mutex_init(&ctx->engines_mutex);
-	e = default_engines(ctx);
-	if (IS_ERR(e)) {
-		err = PTR_ERR(e);
-		goto err_free;
-	}
-	RCU_INIT_POINTER(ctx->engines, e);
-
-	INIT_RADIX_TREE(&ctx->handles_vma, GFP_KERNEL);
-	INIT_LIST_HEAD(&ctx->handles_list);
-	INIT_LIST_HEAD(&ctx->hw_id_link);
-
-	/* NB: Mark all slices as needing a remap so that when the context first
-	 * loads it will restore whatever remap state already exists. If there
-	 * is no remap info, it will be a NOP. */
-	ctx->remap_slice = ALL_L3_SLICES(dev_priv);
-
-	i915_gem_context_set_bannable(ctx);
-	i915_gem_context_set_recoverable(ctx);
-
-	ctx->ring_size = 4 * PAGE_SIZE;
-	ctx->desc_template =
-		default_desc_template(dev_priv, dev_priv->mm.aliasing_ppgtt);
-
-	for (i = 0; i < ARRAY_SIZE(ctx->hang_timestamp); i++)
-		ctx->hang_timestamp[i] = jiffies - CONTEXT_FAST_HANG_JIFFIES;
-
-	return ctx;
-
-err_free:
-	kfree(ctx);
-	return ERR_PTR(err);
-}
-
-static struct i915_hw_ppgtt *
-__set_ppgtt(struct i915_gem_context *ctx, struct i915_hw_ppgtt *ppgtt)
-{
-	struct i915_hw_ppgtt *old = ctx->ppgtt;
-
-	ctx->ppgtt = i915_ppgtt_get(ppgtt);
-	ctx->desc_template = default_desc_template(ctx->i915, ppgtt);
-
-	return old;
-}
-
-static void __assign_ppgtt(struct i915_gem_context *ctx,
-			   struct i915_hw_ppgtt *ppgtt)
-{
-	if (ppgtt == ctx->ppgtt)
-		return;
-
-	ppgtt = __set_ppgtt(ctx, ppgtt);
-	if (ppgtt)
-		i915_ppgtt_put(ppgtt);
-}
-
-static struct i915_gem_context *
-i915_gem_create_context(struct drm_i915_private *dev_priv, unsigned int flags)
-{
-	struct i915_gem_context *ctx;
-
-	lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
-	if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE &&
-	    !HAS_EXECLISTS(dev_priv))
-		return ERR_PTR(-EINVAL);
-
-	/* Reap the most stale context */
-	contexts_free_first(dev_priv);
-
-	ctx = __create_context(dev_priv);
-	if (IS_ERR(ctx))
-		return ctx;
-
-	if (HAS_FULL_PPGTT(dev_priv)) {
-		struct i915_hw_ppgtt *ppgtt;
-
-		ppgtt = i915_ppgtt_create(dev_priv);
-		if (IS_ERR(ppgtt)) {
-			DRM_DEBUG_DRIVER("PPGTT setup failed (%ld)\n",
-					 PTR_ERR(ppgtt));
-			context_close(ctx);
-			return ERR_CAST(ppgtt);
-		}
-
-		__assign_ppgtt(ctx, ppgtt);
-		i915_ppgtt_put(ppgtt);
-	}
-
-	if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE) {
-		struct i915_timeline *timeline;
-
-		timeline = i915_timeline_create(dev_priv, NULL);
-		if (IS_ERR(timeline)) {
-			context_close(ctx);
-			return ERR_CAST(timeline);
-		}
-
-		ctx->timeline = timeline;
-	}
-
-	trace_i915_context_create(ctx);
-
-	return ctx;
-}
-
-/**
- * i915_gem_context_create_gvt - create a GVT GEM context
- * @dev: drm device *
- *
- * This function is used to create a GVT specific GEM context.
- *
- * Returns:
- * pointer to i915_gem_context on success, error pointer if failed
- *
- */
-struct i915_gem_context *
-i915_gem_context_create_gvt(struct drm_device *dev)
-{
-	struct i915_gem_context *ctx;
-	int ret;
-
-	if (!IS_ENABLED(CONFIG_DRM_I915_GVT))
-		return ERR_PTR(-ENODEV);
-
-	ret = i915_mutex_lock_interruptible(dev);
-	if (ret)
-		return ERR_PTR(ret);
-
-	ctx = i915_gem_create_context(to_i915(dev), 0);
-	if (IS_ERR(ctx))
-		goto out;
-
-	ret = i915_gem_context_pin_hw_id(ctx);
-	if (ret) {
-		context_close(ctx);
-		ctx = ERR_PTR(ret);
-		goto out;
-	}
-
-	ctx->file_priv = ERR_PTR(-EBADF);
-	i915_gem_context_set_closed(ctx); /* not user accessible */
-	i915_gem_context_clear_bannable(ctx);
-	i915_gem_context_set_force_single_submission(ctx);
-	if (!USES_GUC_SUBMISSION(to_i915(dev)))
-		ctx->ring_size = 512 * PAGE_SIZE; /* Max ring buffer size */
-
-	GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
-out:
-	mutex_unlock(&dev->struct_mutex);
-	return ctx;
-}
-
-static void
-destroy_kernel_context(struct i915_gem_context **ctxp)
-{
-	struct i915_gem_context *ctx;
-
-	/* Keep the context ref so that we can free it immediately ourselves */
-	ctx = i915_gem_context_get(fetch_and_zero(ctxp));
-	GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
-
-	context_close(ctx);
-	i915_gem_context_free(ctx);
-}
-
-struct i915_gem_context *
-i915_gem_context_create_kernel(struct drm_i915_private *i915, int prio)
-{
-	struct i915_gem_context *ctx;
-	int err;
-
-	ctx = i915_gem_create_context(i915, 0);
-	if (IS_ERR(ctx))
-		return ctx;
-
-	err = i915_gem_context_pin_hw_id(ctx);
-	if (err) {
-		destroy_kernel_context(&ctx);
-		return ERR_PTR(err);
-	}
-
-	i915_gem_context_clear_bannable(ctx);
-	ctx->sched.priority = I915_USER_PRIORITY(prio);
-	ctx->ring_size = PAGE_SIZE;
-
-	GEM_BUG_ON(!i915_gem_context_is_kernel(ctx));
-
-	return ctx;
-}
-
-static void init_contexts(struct drm_i915_private *i915)
-{
-	mutex_init(&i915->contexts.mutex);
-	INIT_LIST_HEAD(&i915->contexts.list);
-
-	/* Using the simple ida interface, the max is limited by sizeof(int) */
-	BUILD_BUG_ON(MAX_CONTEXT_HW_ID > INT_MAX);
-	BUILD_BUG_ON(GEN11_MAX_CONTEXT_HW_ID > INT_MAX);
-	ida_init(&i915->contexts.hw_ida);
-	INIT_LIST_HEAD(&i915->contexts.hw_id_list);
-
-	INIT_WORK(&i915->contexts.free_work, contexts_free_worker);
-	init_llist_head(&i915->contexts.free_list);
-}
-
-static bool needs_preempt_context(struct drm_i915_private *i915)
-{
-	return HAS_EXECLISTS(i915);
-}
-
-int i915_gem_contexts_init(struct drm_i915_private *dev_priv)
-{
-	struct i915_gem_context *ctx;
-
-	/* Reassure ourselves we are only called once */
-	GEM_BUG_ON(dev_priv->kernel_context);
-	GEM_BUG_ON(dev_priv->preempt_context);
-
-	intel_engine_init_ctx_wa(dev_priv->engine[RCS0]);
-	init_contexts(dev_priv);
-
-	/* lowest priority; idle task */
-	ctx = i915_gem_context_create_kernel(dev_priv, I915_PRIORITY_MIN);
-	if (IS_ERR(ctx)) {
-		DRM_ERROR("Failed to create default global context\n");
-		return PTR_ERR(ctx);
-	}
-	/*
-	 * For easy recognisablity, we want the kernel context to be 0 and then
-	 * all user contexts will have non-zero hw_id. Kernel contexts are
-	 * permanently pinned, so that we never suffer a stall and can
-	 * use them from any allocation context (e.g. for evicting other
-	 * contexts and from inside the shrinker).
-	 */
-	GEM_BUG_ON(ctx->hw_id);
-	GEM_BUG_ON(!atomic_read(&ctx->hw_id_pin_count));
-	dev_priv->kernel_context = ctx;
-
-	/* highest priority; preempting task */
-	if (needs_preempt_context(dev_priv)) {
-		ctx = i915_gem_context_create_kernel(dev_priv, INT_MAX);
-		if (!IS_ERR(ctx))
-			dev_priv->preempt_context = ctx;
-		else
-			DRM_ERROR("Failed to create preempt context; disabling preemption\n");
-	}
-
-	DRM_DEBUG_DRIVER("%s context support initialized\n",
-			 DRIVER_CAPS(dev_priv)->has_logical_contexts ?
-			 "logical" : "fake");
-	return 0;
-}
-
-void i915_gem_contexts_lost(struct drm_i915_private *dev_priv)
-{
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-
-	lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
-	for_each_engine(engine, dev_priv, id)
-		intel_engine_lost_context(engine);
-}
-
-void i915_gem_contexts_fini(struct drm_i915_private *i915)
-{
-	lockdep_assert_held(&i915->drm.struct_mutex);
-
-	if (i915->preempt_context)
-		destroy_kernel_context(&i915->preempt_context);
-	destroy_kernel_context(&i915->kernel_context);
-
-	/* Must free all deferred contexts (via flush_workqueue) first */
-	GEM_BUG_ON(!list_empty(&i915->contexts.hw_id_list));
-	ida_destroy(&i915->contexts.hw_ida);
-}
-
-static int context_idr_cleanup(int id, void *p, void *data)
-{
-	context_close(p);
-	return 0;
-}
-
-static int vm_idr_cleanup(int id, void *p, void *data)
-{
-	i915_ppgtt_put(p);
-	return 0;
-}
-
-static int gem_context_register(struct i915_gem_context *ctx,
-				struct drm_i915_file_private *fpriv)
-{
-	int ret;
-
-	ctx->file_priv = fpriv;
-	if (ctx->ppgtt)
-		ctx->ppgtt->vm.file = fpriv;
-
-	ctx->pid = get_task_pid(current, PIDTYPE_PID);
-	ctx->name = kasprintf(GFP_KERNEL, "%s[%d]",
-			      current->comm, pid_nr(ctx->pid));
-	if (!ctx->name) {
-		ret = -ENOMEM;
-		goto err_pid;
-	}
-
-	/* And finally expose ourselves to userspace via the idr */
-	mutex_lock(&fpriv->context_idr_lock);
-	ret = idr_alloc(&fpriv->context_idr, ctx, 0, 0, GFP_KERNEL);
-	mutex_unlock(&fpriv->context_idr_lock);
-	if (ret >= 0)
-		goto out;
-
-	kfree(fetch_and_zero(&ctx->name));
-err_pid:
-	put_pid(fetch_and_zero(&ctx->pid));
-out:
-	return ret;
-}
-
-int i915_gem_context_open(struct drm_i915_private *i915,
-			  struct drm_file *file)
-{
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-	struct i915_gem_context *ctx;
-	int err;
-
-	mutex_init(&file_priv->context_idr_lock);
-	mutex_init(&file_priv->vm_idr_lock);
-
-	idr_init(&file_priv->context_idr);
-	idr_init_base(&file_priv->vm_idr, 1);
-
-	mutex_lock(&i915->drm.struct_mutex);
-	ctx = i915_gem_create_context(i915, 0);
-	mutex_unlock(&i915->drm.struct_mutex);
-	if (IS_ERR(ctx)) {
-		err = PTR_ERR(ctx);
-		goto err;
-	}
-
-	err = gem_context_register(ctx, file_priv);
-	if (err < 0)
-		goto err_ctx;
-
-	GEM_BUG_ON(i915_gem_context_is_kernel(ctx));
-	GEM_BUG_ON(err > 0);
-
-	return 0;
-
-err_ctx:
-	mutex_lock(&i915->drm.struct_mutex);
-	context_close(ctx);
-	mutex_unlock(&i915->drm.struct_mutex);
-err:
-	idr_destroy(&file_priv->vm_idr);
-	idr_destroy(&file_priv->context_idr);
-	mutex_destroy(&file_priv->vm_idr_lock);
-	mutex_destroy(&file_priv->context_idr_lock);
-	return err;
-}
-
-void i915_gem_context_close(struct drm_file *file)
-{
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-
-	lockdep_assert_held(&file_priv->dev_priv->drm.struct_mutex);
-
-	idr_for_each(&file_priv->context_idr, context_idr_cleanup, NULL);
-	idr_destroy(&file_priv->context_idr);
-	mutex_destroy(&file_priv->context_idr_lock);
-
-	idr_for_each(&file_priv->vm_idr, vm_idr_cleanup, NULL);
-	idr_destroy(&file_priv->vm_idr);
-	mutex_destroy(&file_priv->vm_idr_lock);
-}
-
-int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
-			     struct drm_file *file)
-{
-	struct drm_i915_private *i915 = to_i915(dev);
-	struct drm_i915_gem_vm_control *args = data;
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-	struct i915_hw_ppgtt *ppgtt;
-	int err;
-
-	if (!HAS_FULL_PPGTT(i915))
-		return -ENODEV;
-
-	if (args->flags)
-		return -EINVAL;
-
-	ppgtt = i915_ppgtt_create(i915);
-	if (IS_ERR(ppgtt))
-		return PTR_ERR(ppgtt);
-
-	ppgtt->vm.file = file_priv;
-
-	if (args->extensions) {
-		err = i915_user_extensions(u64_to_user_ptr(args->extensions),
-					   NULL, 0,
-					   ppgtt);
-		if (err)
-			goto err_put;
-	}
-
-	err = mutex_lock_interruptible(&file_priv->vm_idr_lock);
-	if (err)
-		goto err_put;
-
-	err = idr_alloc(&file_priv->vm_idr, ppgtt, 0, 0, GFP_KERNEL);
-	if (err < 0)
-		goto err_unlock;
-
-	GEM_BUG_ON(err == 0); /* reserved for invalid/unassigned ppgtt */
-
-	mutex_unlock(&file_priv->vm_idr_lock);
-
-	args->vm_id = err;
-	return 0;
-
-err_unlock:
-	mutex_unlock(&file_priv->vm_idr_lock);
-err_put:
-	i915_ppgtt_put(ppgtt);
-	return err;
-}
-
-int i915_gem_vm_destroy_ioctl(struct drm_device *dev, void *data,
-			      struct drm_file *file)
-{
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-	struct drm_i915_gem_vm_control *args = data;
-	struct i915_hw_ppgtt *ppgtt;
-	int err;
-	u32 id;
-
-	if (args->flags)
-		return -EINVAL;
-
-	if (args->extensions)
-		return -EINVAL;
-
-	id = args->vm_id;
-	if (!id)
-		return -ENOENT;
-
-	err = mutex_lock_interruptible(&file_priv->vm_idr_lock);
-	if (err)
-		return err;
-
-	ppgtt = idr_remove(&file_priv->vm_idr, id);
-
-	mutex_unlock(&file_priv->vm_idr_lock);
-	if (!ppgtt)
-		return -ENOENT;
-
-	i915_ppgtt_put(ppgtt);
-	return 0;
-}
-
-struct context_barrier_task {
-	struct i915_active base;
-	void (*task)(void *data);
-	void *data;
-};
-
-static void cb_retire(struct i915_active *base)
-{
-	struct context_barrier_task *cb = container_of(base, typeof(*cb), base);
-
-	if (cb->task)
-		cb->task(cb->data);
-
-	i915_active_fini(&cb->base);
-	kfree(cb);
-}
-
-I915_SELFTEST_DECLARE(static intel_engine_mask_t context_barrier_inject_fault);
-static int context_barrier_task(struct i915_gem_context *ctx,
-				intel_engine_mask_t engines,
-				int (*emit)(struct i915_request *rq, void *data),
-				void (*task)(void *data),
-				void *data)
-{
-	struct drm_i915_private *i915 = ctx->i915;
-	struct context_barrier_task *cb;
-	struct i915_gem_engines_iter it;
-	struct intel_context *ce;
-	int err = 0;
-
-	lockdep_assert_held(&i915->drm.struct_mutex);
-	GEM_BUG_ON(!task);
-
-	cb = kmalloc(sizeof(*cb), GFP_KERNEL);
-	if (!cb)
-		return -ENOMEM;
-
-	i915_active_init(i915, &cb->base, cb_retire);
-	i915_active_acquire(&cb->base);
-
-	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
-		struct i915_request *rq;
-
-		if (I915_SELFTEST_ONLY(context_barrier_inject_fault &
-				       ce->engine->mask)) {
-			err = -ENXIO;
-			break;
-		}
-
-		if (!(ce->engine->mask & engines) || !ce->state)
-			continue;
-
-		rq = intel_context_create_request(ce);
-		if (IS_ERR(rq)) {
-			err = PTR_ERR(rq);
-			break;
-		}
-
-		err = 0;
-		if (emit)
-			err = emit(rq, data);
-		if (err == 0)
-			err = i915_active_ref(&cb->base, rq->fence.context, rq);
-
-		i915_request_add(rq);
-		if (err)
-			break;
-	}
-	i915_gem_context_unlock_engines(ctx);
-
-	cb->task = err ? NULL : task; /* caller needs to unwind instead */
-	cb->data = data;
-
-	i915_active_release(&cb->base);
-
-	return err;
-}
-
-static int get_ppgtt(struct drm_i915_file_private *file_priv,
-		     struct i915_gem_context *ctx,
-		     struct drm_i915_gem_context_param *args)
-{
-	struct i915_hw_ppgtt *ppgtt;
-	int ret;
-
-	if (!ctx->ppgtt)
-		return -ENODEV;
-
-	/* XXX rcu acquire? */
-	ret = mutex_lock_interruptible(&ctx->i915->drm.struct_mutex);
-	if (ret)
-		return ret;
-
-	ppgtt = i915_ppgtt_get(ctx->ppgtt);
-	mutex_unlock(&ctx->i915->drm.struct_mutex);
-
-	ret = mutex_lock_interruptible(&file_priv->vm_idr_lock);
-	if (ret)
-		goto err_put;
-
-	ret = idr_alloc(&file_priv->vm_idr, ppgtt, 0, 0, GFP_KERNEL);
-	GEM_BUG_ON(!ret);
-	if (ret < 0)
-		goto err_unlock;
-
-	i915_ppgtt_get(ppgtt);
-
-	args->size = 0;
-	args->value = ret;
-
-	ret = 0;
-err_unlock:
-	mutex_unlock(&file_priv->vm_idr_lock);
-err_put:
-	i915_ppgtt_put(ppgtt);
-	return ret;
-}
-
-static void set_ppgtt_barrier(void *data)
-{
-	struct i915_hw_ppgtt *old = data;
-
-	if (INTEL_GEN(old->vm.i915) < 8)
-		gen6_ppgtt_unpin_all(old);
-
-	i915_ppgtt_put(old);
-}
-
-static int emit_ppgtt_update(struct i915_request *rq, void *data)
-{
-	struct i915_hw_ppgtt *ppgtt = rq->gem_context->ppgtt;
-	struct intel_engine_cs *engine = rq->engine;
-	u32 base = engine->mmio_base;
-	u32 *cs;
-	int i;
-
-	if (i915_vm_is_4lvl(&ppgtt->vm)) {
-		const dma_addr_t pd_daddr = px_dma(&ppgtt->pml4);
-
-		cs = intel_ring_begin(rq, 6);
-		if (IS_ERR(cs))
-			return PTR_ERR(cs);
-
-		*cs++ = MI_LOAD_REGISTER_IMM(2);
-
-		*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(base, 0));
-		*cs++ = upper_32_bits(pd_daddr);
-		*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(base, 0));
-		*cs++ = lower_32_bits(pd_daddr);
-
-		*cs++ = MI_NOOP;
-		intel_ring_advance(rq, cs);
-	} else if (HAS_LOGICAL_RING_CONTEXTS(engine->i915)) {
-		cs = intel_ring_begin(rq, 4 * GEN8_3LVL_PDPES + 2);
-		if (IS_ERR(cs))
-			return PTR_ERR(cs);
-
-		*cs++ = MI_LOAD_REGISTER_IMM(2 * GEN8_3LVL_PDPES);
-		for (i = GEN8_3LVL_PDPES; i--; ) {
-			const dma_addr_t pd_daddr = i915_page_dir_dma_addr(ppgtt, i);
-
-			*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_UDW(base, i));
-			*cs++ = upper_32_bits(pd_daddr);
-			*cs++ = i915_mmio_reg_offset(GEN8_RING_PDP_LDW(base, i));
-			*cs++ = lower_32_bits(pd_daddr);
-		}
-		*cs++ = MI_NOOP;
-		intel_ring_advance(rq, cs);
-	} else {
-		/* ppGTT is not part of the legacy context image */
-		gen6_ppgtt_pin(ppgtt);
-	}
-
-	return 0;
-}
-
-static int set_ppgtt(struct drm_i915_file_private *file_priv,
-		     struct i915_gem_context *ctx,
-		     struct drm_i915_gem_context_param *args)
-{
-	struct i915_hw_ppgtt *ppgtt, *old;
-	int err;
-
-	if (args->size)
-		return -EINVAL;
-
-	if (!ctx->ppgtt)
-		return -ENODEV;
-
-	if (upper_32_bits(args->value))
-		return -ENOENT;
-
-	err = mutex_lock_interruptible(&file_priv->vm_idr_lock);
-	if (err)
-		return err;
-
-	ppgtt = idr_find(&file_priv->vm_idr, args->value);
-	if (ppgtt)
-		i915_ppgtt_get(ppgtt);
-	mutex_unlock(&file_priv->vm_idr_lock);
-	if (!ppgtt)
-		return -ENOENT;
-
-	err = mutex_lock_interruptible(&ctx->i915->drm.struct_mutex);
-	if (err)
-		goto out;
-
-	if (ppgtt == ctx->ppgtt)
-		goto unlock;
-
-	/* Teardown the existing obj:vma cache, it will have to be rebuilt. */
-	lut_close(ctx);
-
-	old = __set_ppgtt(ctx, ppgtt);
-
-	/*
-	 * We need to flush any requests using the current ppgtt before
-	 * we release it as the requests do not hold a reference themselves,
-	 * only indirectly through the context.
-	 */
-	err = context_barrier_task(ctx, ALL_ENGINES,
-				   emit_ppgtt_update,
-				   set_ppgtt_barrier,
-				   old);
-	if (err) {
-		ctx->ppgtt = old;
-		ctx->desc_template = default_desc_template(ctx->i915, old);
-		i915_ppgtt_put(ppgtt);
-	}
-
-unlock:
-	mutex_unlock(&ctx->i915->drm.struct_mutex);
-
-out:
-	i915_ppgtt_put(ppgtt);
-	return err;
-}
-
-static int gen8_emit_rpcs_config(struct i915_request *rq,
-				 struct intel_context *ce,
-				 struct intel_sseu sseu)
-{
-	u64 offset;
-	u32 *cs;
-
-	cs = intel_ring_begin(rq, 4);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	offset = i915_ggtt_offset(ce->state) +
-		 LRC_STATE_PN * PAGE_SIZE +
-		 (CTX_R_PWR_CLK_STATE + 1) * 4;
-
-	*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
-	*cs++ = lower_32_bits(offset);
-	*cs++ = upper_32_bits(offset);
-	*cs++ = intel_sseu_make_rpcs(rq->i915, &sseu);
-
-	intel_ring_advance(rq, cs);
-
-	return 0;
-}
-
-static int
-gen8_modify_rpcs(struct intel_context *ce, struct intel_sseu sseu)
-{
-	struct i915_request *rq;
-	int ret;
-
-	lockdep_assert_held(&ce->pin_mutex);
-
-	/*
-	 * If the context is not idle, we have to submit an ordered request to
-	 * modify its context image via the kernel context (writing to our own
-	 * image, or into the registers directory, does not stick). Pristine
-	 * and idle contexts will be configured on pinning.
-	 */
-	if (!intel_context_is_pinned(ce))
-		return 0;
-
-	rq = i915_request_create(ce->engine->kernel_context);
-	if (IS_ERR(rq))
-		return PTR_ERR(rq);
-
-	/* Queue this switch after all other activity by this context. */
-	ret = i915_active_request_set(&ce->ring->timeline->last_request, rq);
-	if (ret)
-		goto out_add;
-
-	ret = gen8_emit_rpcs_config(rq, ce, sseu);
-	if (ret)
-		goto out_add;
-
-	/*
-	 * Guarantee context image and the timeline remains pinned until the
-	 * modifying request is retired by setting the ce activity tracker.
-	 *
-	 * But we only need to take one pin on the account of it. Or in other
-	 * words transfer the pinned ce object to tracked active request.
-	 */
-	if (!i915_active_request_isset(&ce->active_tracker))
-		__intel_context_pin(ce);
-	__i915_active_request_set(&ce->active_tracker, rq);
-
-out_add:
-	i915_request_add(rq);
-	return ret;
-}
-
-static int
-__intel_context_reconfigure_sseu(struct intel_context *ce,
-				 struct intel_sseu sseu)
-{
-	int ret;
-
-	GEM_BUG_ON(INTEL_GEN(ce->gem_context->i915) < 8);
-
-	ret = intel_context_lock_pinned(ce);
-	if (ret)
-		return ret;
-
-	/* Nothing to do if unmodified. */
-	if (!memcmp(&ce->sseu, &sseu, sizeof(sseu)))
-		goto unlock;
-
-	ret = gen8_modify_rpcs(ce, sseu);
-	if (!ret)
-		ce->sseu = sseu;
-
-unlock:
-	intel_context_unlock_pinned(ce);
-	return ret;
-}
-
-static int
-intel_context_reconfigure_sseu(struct intel_context *ce, struct intel_sseu sseu)
-{
-	struct drm_i915_private *i915 = ce->gem_context->i915;
-	int ret;
-
-	ret = mutex_lock_interruptible(&i915->drm.struct_mutex);
-	if (ret)
-		return ret;
-
-	ret = __intel_context_reconfigure_sseu(ce, sseu);
-
-	mutex_unlock(&i915->drm.struct_mutex);
-
-	return ret;
-}
-
-static int
-user_to_context_sseu(struct drm_i915_private *i915,
-		     const struct drm_i915_gem_context_param_sseu *user,
-		     struct intel_sseu *context)
-{
-	const struct sseu_dev_info *device = &RUNTIME_INFO(i915)->sseu;
-
-	/* No zeros in any field. */
-	if (!user->slice_mask || !user->subslice_mask ||
-	    !user->min_eus_per_subslice || !user->max_eus_per_subslice)
-		return -EINVAL;
-
-	/* Max > min. */
-	if (user->max_eus_per_subslice < user->min_eus_per_subslice)
-		return -EINVAL;
-
-	/*
-	 * Some future proofing on the types since the uAPI is wider than the
-	 * current internal implementation.
-	 */
-	if (overflows_type(user->slice_mask, context->slice_mask) ||
-	    overflows_type(user->subslice_mask, context->subslice_mask) ||
-	    overflows_type(user->min_eus_per_subslice,
-			   context->min_eus_per_subslice) ||
-	    overflows_type(user->max_eus_per_subslice,
-			   context->max_eus_per_subslice))
-		return -EINVAL;
-
-	/* Check validity against hardware. */
-	if (user->slice_mask & ~device->slice_mask)
-		return -EINVAL;
-
-	if (user->subslice_mask & ~device->subslice_mask[0])
-		return -EINVAL;
-
-	if (user->max_eus_per_subslice > device->max_eus_per_subslice)
-		return -EINVAL;
-
-	context->slice_mask = user->slice_mask;
-	context->subslice_mask = user->subslice_mask;
-	context->min_eus_per_subslice = user->min_eus_per_subslice;
-	context->max_eus_per_subslice = user->max_eus_per_subslice;
-
-	/* Part specific restrictions. */
-	if (IS_GEN(i915, 11)) {
-		unsigned int hw_s = hweight8(device->slice_mask);
-		unsigned int hw_ss_per_s = hweight8(device->subslice_mask[0]);
-		unsigned int req_s = hweight8(context->slice_mask);
-		unsigned int req_ss = hweight8(context->subslice_mask);
-
-		/*
-		 * Only full subslice enablement is possible if more than one
-		 * slice is turned on.
-		 */
-		if (req_s > 1 && req_ss != hw_ss_per_s)
-			return -EINVAL;
-
-		/*
-		 * If more than four (SScount bitfield limit) subslices are
-		 * requested then the number has to be even.
-		 */
-		if (req_ss > 4 && (req_ss & 1))
-			return -EINVAL;
-
-		/*
-		 * If only one slice is enabled and subslice count is below the
-		 * device full enablement, it must be at most half of the all
-		 * available subslices.
-		 */
-		if (req_s == 1 && req_ss < hw_ss_per_s &&
-		    req_ss > (hw_ss_per_s / 2))
-			return -EINVAL;
-
-		/* ABI restriction - VME use case only. */
-
-		/* All slices or one slice only. */
-		if (req_s != 1 && req_s != hw_s)
-			return -EINVAL;
-
-		/*
-		 * Half subslices or full enablement only when one slice is
-		 * enabled.
-		 */
-		if (req_s == 1 &&
-		    (req_ss != hw_ss_per_s && req_ss != (hw_ss_per_s / 2)))
-			return -EINVAL;
-
-		/* No EU configuration changes. */
-		if ((user->min_eus_per_subslice !=
-		     device->max_eus_per_subslice) ||
-		    (user->max_eus_per_subslice !=
-		     device->max_eus_per_subslice))
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int set_sseu(struct i915_gem_context *ctx,
-		    struct drm_i915_gem_context_param *args)
-{
-	struct drm_i915_private *i915 = ctx->i915;
-	struct drm_i915_gem_context_param_sseu user_sseu;
-	struct intel_context *ce;
-	struct intel_sseu sseu;
-	unsigned long lookup;
-	int ret;
-
-	if (args->size < sizeof(user_sseu))
-		return -EINVAL;
-
-	if (!IS_GEN(i915, 11))
-		return -ENODEV;
-
-	if (copy_from_user(&user_sseu, u64_to_user_ptr(args->value),
-			   sizeof(user_sseu)))
-		return -EFAULT;
-
-	if (user_sseu.rsvd)
-		return -EINVAL;
-
-	if (user_sseu.flags & ~(I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX))
-		return -EINVAL;
-
-	lookup = 0;
-	if (user_sseu.flags & I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX)
-		lookup |= LOOKUP_USER_INDEX;
-
-	ce = lookup_user_engine(ctx, lookup, &user_sseu.engine);
-	if (IS_ERR(ce))
-		return PTR_ERR(ce);
-
-	/* Only render engine supports RPCS configuration. */
-	if (ce->engine->class != RENDER_CLASS) {
-		ret = -ENODEV;
-		goto out_ce;
-	}
-
-	ret = user_to_context_sseu(i915, &user_sseu, &sseu);
-	if (ret)
-		goto out_ce;
-
-	ret = intel_context_reconfigure_sseu(ce, sseu);
-	if (ret)
-		goto out_ce;
-
-	args->size = sizeof(user_sseu);
-
-out_ce:
-	intel_context_put(ce);
-	return ret;
-}
-
-struct set_engines {
-	struct i915_gem_context *ctx;
-	struct i915_gem_engines *engines;
-};
-
-static int
-set_engines__load_balance(struct i915_user_extension __user *base, void *data)
-{
-	struct i915_context_engines_load_balance __user *ext =
-		container_of_user(base, typeof(*ext), base);
-	const struct set_engines *set = data;
-	struct intel_engine_cs *stack[16];
-	struct intel_engine_cs **siblings;
-	struct intel_context *ce;
-	u16 num_siblings, idx;
-	unsigned int n;
-	int err;
-
-	if (!HAS_EXECLISTS(set->ctx->i915))
-		return -ENODEV;
-
-	if (USES_GUC_SUBMISSION(set->ctx->i915))
-		return -ENODEV; /* not implement yet */
-
-	if (get_user(idx, &ext->engine_index))
-		return -EFAULT;
-
-	if (idx >= set->engines->num_engines) {
-		DRM_DEBUG("Invalid placement value, %d >= %d\n",
-			  idx, set->engines->num_engines);
-		return -EINVAL;
-	}
-
-	idx = array_index_nospec(idx, set->engines->num_engines);
-	if (set->engines->engines[idx]) {
-		DRM_DEBUG("Invalid placement[%d], already occupied\n", idx);
-		return -EEXIST;
-	}
-
-	if (get_user(num_siblings, &ext->num_siblings))
-		return -EFAULT;
-
-	err = check_user_mbz(&ext->flags);
-	if (err)
-		return err;
-
-	err = check_user_mbz(&ext->mbz64);
-	if (err)
-		return err;
-
-	siblings = stack;
-	if (num_siblings > ARRAY_SIZE(stack)) {
-		siblings = kmalloc_array(num_siblings,
-					 sizeof(*siblings),
-					 GFP_KERNEL);
-		if (!siblings)
-			return -ENOMEM;
-	}
-
-	for (n = 0; n < num_siblings; n++) {
-		struct i915_engine_class_instance ci;
-
-		if (copy_from_user(&ci, &ext->engines[n], sizeof(ci))) {
-			err = -EFAULT;
-			goto out_siblings;
-		}
-
-		siblings[n] = intel_engine_lookup_user(set->ctx->i915,
-						       ci.engine_class,
-						       ci.engine_instance);
-		if (!siblings[n]) {
-			DRM_DEBUG("Invalid sibling[%d]: { class:%d, inst:%d }\n",
-				  n, ci.engine_class, ci.engine_instance);
-			err = -EINVAL;
-			goto out_siblings;
-		}
-	}
-
-	ce = intel_execlists_create_virtual(set->ctx, siblings, n);
-	if (IS_ERR(ce)) {
-		err = PTR_ERR(ce);
-		goto out_siblings;
-	}
-
-	if (cmpxchg(&set->engines->engines[idx], NULL, ce)) {
-		intel_context_put(ce);
-		err = -EEXIST;
-		goto out_siblings;
-	}
-
-out_siblings:
-	if (siblings != stack)
-		kfree(siblings);
-
-	return err;
-}
-
-static int
-set_engines__bond(struct i915_user_extension __user *base, void *data)
-{
-	struct i915_context_engines_bond __user *ext =
-		container_of_user(base, typeof(*ext), base);
-	const struct set_engines *set = data;
-	struct i915_engine_class_instance ci;
-	struct intel_engine_cs *virtual;
-	struct intel_engine_cs *master;
-	u16 idx, num_bonds;
-	int err, n;
-
-	if (get_user(idx, &ext->virtual_index))
-		return -EFAULT;
-
-	if (idx >= set->engines->num_engines) {
-		DRM_DEBUG("Invalid index for virtual engine: %d >= %d\n",
-			  idx, set->engines->num_engines);
-		return -EINVAL;
-	}
-
-	idx = array_index_nospec(idx, set->engines->num_engines);
-	if (!set->engines->engines[idx]) {
-		DRM_DEBUG("Invalid engine at %d\n", idx);
-		return -EINVAL;
-	}
-	virtual = set->engines->engines[idx]->engine;
-
-	err = check_user_mbz(&ext->flags);
-	if (err)
-		return err;
-
-	for (n = 0; n < ARRAY_SIZE(ext->mbz64); n++) {
-		err = check_user_mbz(&ext->mbz64[n]);
-		if (err)
-			return err;
-	}
-
-	if (copy_from_user(&ci, &ext->master, sizeof(ci)))
-		return -EFAULT;
-
-	master = intel_engine_lookup_user(set->ctx->i915,
-					  ci.engine_class, ci.engine_instance);
-	if (!master) {
-		DRM_DEBUG("Unrecognised master engine: { class:%u, instance:%u }\n",
-			  ci.engine_class, ci.engine_instance);
-		return -EINVAL;
-	}
-
-	if (get_user(num_bonds, &ext->num_bonds))
-		return -EFAULT;
-
-	for (n = 0; n < num_bonds; n++) {
-		struct intel_engine_cs *bond;
-
-		if (copy_from_user(&ci, &ext->engines[n], sizeof(ci)))
-			return -EFAULT;
-
-		bond = intel_engine_lookup_user(set->ctx->i915,
-						ci.engine_class,
-						ci.engine_instance);
-		if (!bond) {
-			DRM_DEBUG("Unrecognised engine[%d] for bonding: { class:%d, instance: %d }\n",
-				  n, ci.engine_class, ci.engine_instance);
-			return -EINVAL;
-		}
-
-		/*
-		 * A non-virtual engine has no siblings to choose between; and
-		 * a submit fence will always be directed to the one engine.
-		 */
-		if (intel_engine_is_virtual(virtual)) {
-			err = intel_virtual_engine_attach_bond(virtual,
-							       master,
-							       bond);
-			if (err)
-				return err;
-		}
-	}
-
-	return 0;
-}
-
-static const i915_user_extension_fn set_engines__extensions[] = {
-	[I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE] = set_engines__load_balance,
-	[I915_CONTEXT_ENGINES_EXT_BOND] = set_engines__bond,
-};
-
-static int
-set_engines(struct i915_gem_context *ctx,
-	    const struct drm_i915_gem_context_param *args)
-{
-	struct i915_context_param_engines __user *user =
-		u64_to_user_ptr(args->value);
-	struct set_engines set = { .ctx = ctx };
-	unsigned int num_engines, n;
-	u64 extensions;
-	int err;
-
-	if (!args->size) { /* switch back to legacy user_ring_map */
-		if (!i915_gem_context_user_engines(ctx))
-			return 0;
-
-		set.engines = default_engines(ctx);
-		if (IS_ERR(set.engines))
-			return PTR_ERR(set.engines);
-
-		goto replace;
-	}
-
-	BUILD_BUG_ON(!IS_ALIGNED(sizeof(*user), sizeof(*user->engines)));
-	if (args->size < sizeof(*user) ||
-	    !IS_ALIGNED(args->size, sizeof(*user->engines))) {
-		DRM_DEBUG("Invalid size for engine array: %d\n",
-			  args->size);
-		return -EINVAL;
-	}
-
-	/*
-	 * Note that I915_EXEC_RING_MASK limits execbuf to only using the
-	 * first 64 engines defined here.
-	 */
-	num_engines = (args->size - sizeof(*user)) / sizeof(*user->engines);
-
-	set.engines = kmalloc(struct_size(set.engines, engines, num_engines),
-			      GFP_KERNEL);
-	if (!set.engines)
-		return -ENOMEM;
-
-	set.engines->i915 = ctx->i915;
-	for (n = 0; n < num_engines; n++) {
-		struct i915_engine_class_instance ci;
-		struct intel_engine_cs *engine;
-
-		if (copy_from_user(&ci, &user->engines[n], sizeof(ci))) {
-			__free_engines(set.engines, n);
-			return -EFAULT;
-		}
-
-		if (ci.engine_class == (u16)I915_ENGINE_CLASS_INVALID &&
-		    ci.engine_instance == (u16)I915_ENGINE_CLASS_INVALID_NONE) {
-			set.engines->engines[n] = NULL;
-			continue;
-		}
-
-		engine = intel_engine_lookup_user(ctx->i915,
-						  ci.engine_class,
-						  ci.engine_instance);
-		if (!engine) {
-			DRM_DEBUG("Invalid engine[%d]: { class:%d, instance:%d }\n",
-				  n, ci.engine_class, ci.engine_instance);
-			__free_engines(set.engines, n);
-			return -ENOENT;
-		}
-
-		set.engines->engines[n] = intel_context_create(ctx, engine);
-		if (!set.engines->engines[n]) {
-			__free_engines(set.engines, n);
-			return -ENOMEM;
-		}
-	}
-	set.engines->num_engines = num_engines;
-
-	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) {
-		free_engines(set.engines);
-		return err;
-	}
-
-replace:
-	mutex_lock(&ctx->engines_mutex);
-	if (args->size)
-		i915_gem_context_set_user_engines(ctx);
-	else
-		i915_gem_context_clear_user_engines(ctx);
-	rcu_swap_protected(ctx->engines, set.engines, 1);
-	mutex_unlock(&ctx->engines_mutex);
-
-	INIT_RCU_WORK(&set.engines->rcu, free_engines_rcu);
-	queue_rcu_work(system_wq, &set.engines->rcu);
-
-	return 0;
-}
-
-static struct i915_gem_engines *
-__copy_engines(struct i915_gem_engines *e)
-{
-	struct i915_gem_engines *copy;
-	unsigned int n;
-
-	copy = kmalloc(struct_size(e, engines, e->num_engines), GFP_KERNEL);
-	if (!copy)
-		return ERR_PTR(-ENOMEM);
-
-	copy->i915 = e->i915;
-	for (n = 0; n < e->num_engines; n++) {
-		if (e->engines[n])
-			copy->engines[n] = intel_context_get(e->engines[n]);
-		else
-			copy->engines[n] = NULL;
-	}
-	copy->num_engines = n;
-
-	return copy;
-}
-
-static int
-get_engines(struct i915_gem_context *ctx,
-	    struct drm_i915_gem_context_param *args)
-{
-	struct i915_context_param_engines __user *user;
-	struct i915_gem_engines *e;
-	size_t n, count, size;
-	int err = 0;
-
-	err = mutex_lock_interruptible(&ctx->engines_mutex);
-	if (err)
-		return err;
-
-	e = NULL;
-	if (i915_gem_context_user_engines(ctx))
-		e = __copy_engines(i915_gem_context_engines(ctx));
-	mutex_unlock(&ctx->engines_mutex);
-	if (IS_ERR_OR_NULL(e)) {
-		args->size = 0;
-		return PTR_ERR_OR_ZERO(e);
-	}
-
-	count = e->num_engines;
-
-	/* Be paranoid in case we have an impedance mismatch */
-	if (!check_struct_size(user, engines, count, &size)) {
-		err = -EINVAL;
-		goto err_free;
-	}
-	if (overflows_type(size, args->size)) {
-		err = -EINVAL;
-		goto err_free;
-	}
-
-	if (!args->size) {
-		args->size = size;
-		goto err_free;
-	}
-
-	if (args->size < size) {
-		err = -EINVAL;
-		goto err_free;
-	}
-
-	user = u64_to_user_ptr(args->value);
-	if (!access_ok(user, size)) {
-		err = -EFAULT;
-		goto err_free;
-	}
-
-	if (put_user(0, &user->extensions)) {
-		err = -EFAULT;
-		goto err_free;
-	}
-
-	for (n = 0; n < count; n++) {
-		struct i915_engine_class_instance ci = {
-			.engine_class = I915_ENGINE_CLASS_INVALID,
-			.engine_instance = I915_ENGINE_CLASS_INVALID_NONE,
-		};
-
-		if (e->engines[n]) {
-			ci.engine_class = e->engines[n]->engine->uabi_class;
-			ci.engine_instance = e->engines[n]->engine->instance;
-		}
-
-		if (copy_to_user(&user->engines[n], &ci, sizeof(ci))) {
-			err = -EFAULT;
-			goto err_free;
-		}
-	}
-
-	args->size = size;
-
-err_free:
-	INIT_RCU_WORK(&e->rcu, free_engines_rcu);
-	queue_rcu_work(system_wq, &e->rcu);
-	return err;
-}
-
-static int ctx_setparam(struct drm_i915_file_private *fpriv,
-			struct i915_gem_context *ctx,
-			struct drm_i915_gem_context_param *args)
-{
-	int ret = 0;
-
-	switch (args->param) {
-	case I915_CONTEXT_PARAM_NO_ZEROMAP:
-		if (args->size)
-			ret = -EINVAL;
-		else if (args->value)
-			set_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
-		else
-			clear_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
-		break;
-
-	case I915_CONTEXT_PARAM_NO_ERROR_CAPTURE:
-		if (args->size)
-			ret = -EINVAL;
-		else if (args->value)
-			i915_gem_context_set_no_error_capture(ctx);
-		else
-			i915_gem_context_clear_no_error_capture(ctx);
-		break;
-
-	case I915_CONTEXT_PARAM_BANNABLE:
-		if (args->size)
-			ret = -EINVAL;
-		else if (!capable(CAP_SYS_ADMIN) && !args->value)
-			ret = -EPERM;
-		else if (args->value)
-			i915_gem_context_set_bannable(ctx);
-		else
-			i915_gem_context_clear_bannable(ctx);
-		break;
-
-	case I915_CONTEXT_PARAM_RECOVERABLE:
-		if (args->size)
-			ret = -EINVAL;
-		else if (args->value)
-			i915_gem_context_set_recoverable(ctx);
-		else
-			i915_gem_context_clear_recoverable(ctx);
-		break;
-
-	case I915_CONTEXT_PARAM_PRIORITY:
-		{
-			s64 priority = args->value;
-
-			if (args->size)
-				ret = -EINVAL;
-			else if (!(ctx->i915->caps.scheduler & I915_SCHEDULER_CAP_PRIORITY))
-				ret = -ENODEV;
-			else if (priority > I915_CONTEXT_MAX_USER_PRIORITY ||
-				 priority < I915_CONTEXT_MIN_USER_PRIORITY)
-				ret = -EINVAL;
-			else if (priority > I915_CONTEXT_DEFAULT_PRIORITY &&
-				 !capable(CAP_SYS_NICE))
-				ret = -EPERM;
-			else
-				ctx->sched.priority =
-					I915_USER_PRIORITY(priority);
-		}
-		break;
-
-	case I915_CONTEXT_PARAM_SSEU:
-		ret = set_sseu(ctx, args);
-		break;
-
-	case I915_CONTEXT_PARAM_VM:
-		ret = set_ppgtt(fpriv, ctx, args);
-		break;
-
-	case I915_CONTEXT_PARAM_ENGINES:
-		ret = set_engines(ctx, args);
-		break;
-
-	case I915_CONTEXT_PARAM_BAN_PERIOD:
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
-struct create_ext {
-	struct i915_gem_context *ctx;
-	struct drm_i915_file_private *fpriv;
-};
-
-static int create_setparam(struct i915_user_extension __user *ext, void *data)
-{
-	struct drm_i915_gem_context_create_ext_setparam local;
-	const struct create_ext *arg = data;
-
-	if (copy_from_user(&local, ext, sizeof(local)))
-		return -EFAULT;
-
-	if (local.param.ctx_id)
-		return -EINVAL;
-
-	return ctx_setparam(arg->fpriv, arg->ctx, &local.param);
-}
-
-static int clone_engines(struct i915_gem_context *dst,
-			 struct i915_gem_context *src)
-{
-	struct i915_gem_engines *e = i915_gem_context_lock_engines(src);
-	struct i915_gem_engines *clone;
-	bool user_engines;
-	unsigned long n;
-
-	clone = kmalloc(struct_size(e, engines, e->num_engines), GFP_KERNEL);
-	if (!clone)
-		goto err_unlock;
-
-	clone->i915 = dst->i915;
-	for (n = 0; n < e->num_engines; n++) {
-		struct intel_engine_cs *engine;
-
-		if (!e->engines[n]) {
-			clone->engines[n] = NULL;
-			continue;
-		}
-		engine = e->engines[n]->engine;
-
-		/*
-		 * Virtual engines are singletons; they can only exist
-		 * inside a single context, because they embed their
-		 * HW context... As each virtual context implies a single
-		 * timeline (each engine can only dequeue a single request
-		 * at any time), it would be surprising for two contexts
-		 * to use the same engine. So let's create a copy of
-		 * the virtual engine instead.
-		 */
-		if (intel_engine_is_virtual(engine))
-			clone->engines[n] =
-				intel_execlists_clone_virtual(dst, engine);
-		else
-			clone->engines[n] = intel_context_create(dst, engine);
-		if (IS_ERR_OR_NULL(clone->engines[n])) {
-			__free_engines(clone, n);
-			goto err_unlock;
-		}
-	}
-	clone->num_engines = n;
-
-	user_engines = i915_gem_context_user_engines(src);
-	i915_gem_context_unlock_engines(src);
-
-	free_engines(dst->engines);
-	RCU_INIT_POINTER(dst->engines, clone);
-	if (user_engines)
-		i915_gem_context_set_user_engines(dst);
-	else
-		i915_gem_context_clear_user_engines(dst);
-	return 0;
-
-err_unlock:
-	i915_gem_context_unlock_engines(src);
-	return -ENOMEM;
-}
-
-static int clone_flags(struct i915_gem_context *dst,
-		       struct i915_gem_context *src)
-{
-	dst->user_flags = src->user_flags;
-	return 0;
-}
-
-static int clone_schedattr(struct i915_gem_context *dst,
-			   struct i915_gem_context *src)
-{
-	dst->sched = src->sched;
-	return 0;
-}
-
-static int clone_sseu(struct i915_gem_context *dst,
-		      struct i915_gem_context *src)
-{
-	struct i915_gem_engines *e = i915_gem_context_lock_engines(src);
-	struct i915_gem_engines *clone;
-	unsigned long n;
-	int err;
-
-	clone = dst->engines; /* no locking required; sole access */
-	if (e->num_engines != clone->num_engines) {
-		err = -EINVAL;
-		goto unlock;
-	}
-
-	for (n = 0; n < e->num_engines; n++) {
-		struct intel_context *ce = e->engines[n];
-
-		if (clone->engines[n]->engine->class != ce->engine->class) {
-			/* Must have compatible engine maps! */
-			err = -EINVAL;
-			goto unlock;
-		}
-
-		/* serialises with set_sseu */
-		err = intel_context_lock_pinned(ce);
-		if (err)
-			goto unlock;
-
-		clone->engines[n]->sseu = ce->sseu;
-		intel_context_unlock_pinned(ce);
-	}
-
-	err = 0;
-unlock:
-	i915_gem_context_unlock_engines(src);
-	return err;
-}
-
-static int clone_timeline(struct i915_gem_context *dst,
-			  struct i915_gem_context *src)
-{
-	if (src->timeline) {
-		GEM_BUG_ON(src->timeline == dst->timeline);
-
-		if (dst->timeline)
-			i915_timeline_put(dst->timeline);
-		dst->timeline = i915_timeline_get(src->timeline);
-	}
-
-	return 0;
-}
-
-static int clone_vm(struct i915_gem_context *dst,
-		    struct i915_gem_context *src)
-{
-	struct i915_hw_ppgtt *ppgtt;
-
-	rcu_read_lock();
-	do {
-		ppgtt = READ_ONCE(src->ppgtt);
-		if (!ppgtt)
-			break;
-
-		if (!kref_get_unless_zero(&ppgtt->ref))
-			continue;
-
-		/*
-		 * This ppgtt may have be reallocated between
-		 * the read and the kref, and reassigned to a third
-		 * context. In order to avoid inadvertent sharing
-		 * of this ppgtt with that third context (and not
-		 * src), we have to confirm that we have the same
-		 * ppgtt after passing through the strong memory
-		 * barrier implied by a successful
-		 * kref_get_unless_zero().
-		 *
-		 * Once we have acquired the current ppgtt of src,
-		 * we no longer care if it is released from src, as
-		 * it cannot be reallocated elsewhere.
-		 */
-
-		if (ppgtt == READ_ONCE(src->ppgtt))
-			break;
-
-		i915_ppgtt_put(ppgtt);
-	} while (1);
-	rcu_read_unlock();
-
-	if (ppgtt) {
-		__assign_ppgtt(dst, ppgtt);
-		i915_ppgtt_put(ppgtt);
-	}
-
-	return 0;
-}
-
-static int create_clone(struct i915_user_extension __user *ext, void *data)
-{
-	static int (* const fn[])(struct i915_gem_context *dst,
-				  struct i915_gem_context *src) = {
-#define MAP(x, y) [ilog2(I915_CONTEXT_CLONE_##x)] = y
-		MAP(ENGINES, clone_engines),
-		MAP(FLAGS, clone_flags),
-		MAP(SCHEDATTR, clone_schedattr),
-		MAP(SSEU, clone_sseu),
-		MAP(TIMELINE, clone_timeline),
-		MAP(VM, clone_vm),
-#undef MAP
-	};
-	struct drm_i915_gem_context_create_ext_clone local;
-	const struct create_ext *arg = data;
-	struct i915_gem_context *dst = arg->ctx;
-	struct i915_gem_context *src;
-	int err, bit;
-
-	if (copy_from_user(&local, ext, sizeof(local)))
-		return -EFAULT;
-
-	BUILD_BUG_ON(GENMASK(BITS_PER_TYPE(local.flags) - 1, ARRAY_SIZE(fn)) !=
-		     I915_CONTEXT_CLONE_UNKNOWN);
-
-	if (local.flags & I915_CONTEXT_CLONE_UNKNOWN)
-		return -EINVAL;
-
-	if (local.rsvd)
-		return -EINVAL;
-
-	rcu_read_lock();
-	src = __i915_gem_context_lookup_rcu(arg->fpriv, local.clone_id);
-	rcu_read_unlock();
-	if (!src)
-		return -ENOENT;
-
-	GEM_BUG_ON(src == dst);
-
-	for (bit = 0; bit < ARRAY_SIZE(fn); bit++) {
-		if (!(local.flags & BIT(bit)))
-			continue;
-
-		err = fn[bit](dst, src);
-		if (err)
-			return err;
-	}
-
-	return 0;
-}
-
-static const i915_user_extension_fn create_extensions[] = {
-	[I915_CONTEXT_CREATE_EXT_SETPARAM] = create_setparam,
-	[I915_CONTEXT_CREATE_EXT_CLONE] = create_clone,
-};
-
-static bool client_is_banned(struct drm_i915_file_private *file_priv)
-{
-	return atomic_read(&file_priv->ban_score) >= I915_CLIENT_SCORE_BANNED;
-}
-
-int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
-				  struct drm_file *file)
-{
-	struct drm_i915_private *i915 = to_i915(dev);
-	struct drm_i915_gem_context_create_ext *args = data;
-	struct create_ext ext_data;
-	int ret;
-
-	if (!DRIVER_CAPS(i915)->has_logical_contexts)
-		return -ENODEV;
-
-	if (args->flags & I915_CONTEXT_CREATE_FLAGS_UNKNOWN)
-		return -EINVAL;
-
-	ret = i915_terminally_wedged(i915);
-	if (ret)
-		return ret;
-
-	ext_data.fpriv = file->driver_priv;
-	if (client_is_banned(ext_data.fpriv)) {
-		DRM_DEBUG("client %s[%d] banned from creating ctx\n",
-			  current->comm,
-			  pid_nr(get_task_pid(current, PIDTYPE_PID)));
-		return -EIO;
-	}
-
-	ret = i915_mutex_lock_interruptible(dev);
-	if (ret)
-		return ret;
-
-	ext_data.ctx = i915_gem_create_context(i915, args->flags);
-	mutex_unlock(&dev->struct_mutex);
-	if (IS_ERR(ext_data.ctx))
-		return PTR_ERR(ext_data.ctx);
-
-	if (args->flags & I915_CONTEXT_CREATE_FLAGS_USE_EXTENSIONS) {
-		ret = i915_user_extensions(u64_to_user_ptr(args->extensions),
-					   create_extensions,
-					   ARRAY_SIZE(create_extensions),
-					   &ext_data);
-		if (ret)
-			goto err_ctx;
-	}
-
-	ret = gem_context_register(ext_data.ctx, ext_data.fpriv);
-	if (ret < 0)
-		goto err_ctx;
-
-	args->ctx_id = ret;
-	DRM_DEBUG("HW context %d created\n", args->ctx_id);
-
-	return 0;
-
-err_ctx:
-	mutex_lock(&dev->struct_mutex);
-	context_close(ext_data.ctx);
-	mutex_unlock(&dev->struct_mutex);
-	return ret;
-}
-
-int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
-				   struct drm_file *file)
-{
-	struct drm_i915_gem_context_destroy *args = data;
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-	struct i915_gem_context *ctx;
-
-	if (args->pad != 0)
-		return -EINVAL;
-
-	if (!args->ctx_id)
-		return -ENOENT;
-
-	if (mutex_lock_interruptible(&file_priv->context_idr_lock))
-		return -EINTR;
-
-	ctx = idr_remove(&file_priv->context_idr, args->ctx_id);
-	mutex_unlock(&file_priv->context_idr_lock);
-	if (!ctx)
-		return -ENOENT;
-
-	mutex_lock(&dev->struct_mutex);
-	context_close(ctx);
-	mutex_unlock(&dev->struct_mutex);
-
-	return 0;
-}
-
-static int get_sseu(struct i915_gem_context *ctx,
-		    struct drm_i915_gem_context_param *args)
-{
-	struct drm_i915_gem_context_param_sseu user_sseu;
-	struct intel_context *ce;
-	unsigned long lookup;
-	int err;
-
-	if (args->size == 0)
-		goto out;
-	else if (args->size < sizeof(user_sseu))
-		return -EINVAL;
-
-	if (copy_from_user(&user_sseu, u64_to_user_ptr(args->value),
-			   sizeof(user_sseu)))
-		return -EFAULT;
-
-	if (user_sseu.rsvd)
-		return -EINVAL;
-
-	if (user_sseu.flags & ~(I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX))
-		return -EINVAL;
-
-	lookup = 0;
-	if (user_sseu.flags & I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX)
-		lookup |= LOOKUP_USER_INDEX;
-
-	ce = lookup_user_engine(ctx, lookup, &user_sseu.engine);
-	if (IS_ERR(ce))
-		return PTR_ERR(ce);
-
-	err = intel_context_lock_pinned(ce); /* serialises with set_sseu */
-	if (err) {
-		intel_context_put(ce);
-		return err;
-	}
-
-	user_sseu.slice_mask = ce->sseu.slice_mask;
-	user_sseu.subslice_mask = ce->sseu.subslice_mask;
-	user_sseu.min_eus_per_subslice = ce->sseu.min_eus_per_subslice;
-	user_sseu.max_eus_per_subslice = ce->sseu.max_eus_per_subslice;
-
-	intel_context_unlock_pinned(ce);
-	intel_context_put(ce);
-
-	if (copy_to_user(u64_to_user_ptr(args->value), &user_sseu,
-			 sizeof(user_sseu)))
-		return -EFAULT;
-
-out:
-	args->size = sizeof(user_sseu);
-
-	return 0;
-}
-
-int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
-				    struct drm_file *file)
-{
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-	struct drm_i915_gem_context_param *args = data;
-	struct i915_gem_context *ctx;
-	int ret = 0;
-
-	ctx = i915_gem_context_lookup(file_priv, args->ctx_id);
-	if (!ctx)
-		return -ENOENT;
-
-	switch (args->param) {
-	case I915_CONTEXT_PARAM_NO_ZEROMAP:
-		args->size = 0;
-		args->value = test_bit(UCONTEXT_NO_ZEROMAP, &ctx->user_flags);
-		break;
-
-	case I915_CONTEXT_PARAM_GTT_SIZE:
-		args->size = 0;
-		if (ctx->ppgtt)
-			args->value = ctx->ppgtt->vm.total;
-		else if (to_i915(dev)->mm.aliasing_ppgtt)
-			args->value = to_i915(dev)->mm.aliasing_ppgtt->vm.total;
-		else
-			args->value = to_i915(dev)->ggtt.vm.total;
-		break;
-
-	case I915_CONTEXT_PARAM_NO_ERROR_CAPTURE:
-		args->size = 0;
-		args->value = i915_gem_context_no_error_capture(ctx);
-		break;
-
-	case I915_CONTEXT_PARAM_BANNABLE:
-		args->size = 0;
-		args->value = i915_gem_context_is_bannable(ctx);
-		break;
-
-	case I915_CONTEXT_PARAM_RECOVERABLE:
-		args->size = 0;
-		args->value = i915_gem_context_is_recoverable(ctx);
-		break;
-
-	case I915_CONTEXT_PARAM_PRIORITY:
-		args->size = 0;
-		args->value = ctx->sched.priority >> I915_USER_PRIORITY_SHIFT;
-		break;
-
-	case I915_CONTEXT_PARAM_SSEU:
-		ret = get_sseu(ctx, args);
-		break;
-
-	case I915_CONTEXT_PARAM_VM:
-		ret = get_ppgtt(file_priv, ctx, args);
-		break;
-
-	case I915_CONTEXT_PARAM_ENGINES:
-		ret = get_engines(ctx, args);
-		break;
-
-	case I915_CONTEXT_PARAM_BAN_PERIOD:
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	i915_gem_context_put(ctx);
-	return ret;
-}
-
-int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
-				    struct drm_file *file)
-{
-	struct drm_i915_file_private *file_priv = file->driver_priv;
-	struct drm_i915_gem_context_param *args = data;
-	struct i915_gem_context *ctx;
-	int ret;
-
-	ctx = i915_gem_context_lookup(file_priv, args->ctx_id);
-	if (!ctx)
-		return -ENOENT;
-
-	ret = ctx_setparam(file_priv, ctx, args);
-
-	i915_gem_context_put(ctx);
-	return ret;
-}
-
-int i915_gem_context_reset_stats_ioctl(struct drm_device *dev,
-				       void *data, struct drm_file *file)
-{
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct drm_i915_reset_stats *args = data;
-	struct i915_gem_context *ctx;
-	int ret;
-
-	if (args->flags || args->pad)
-		return -EINVAL;
-
-	ret = -ENOENT;
-	rcu_read_lock();
-	ctx = __i915_gem_context_lookup_rcu(file->driver_priv, args->ctx_id);
-	if (!ctx)
-		goto out;
-
-	/*
-	 * We opt for unserialised reads here. This may result in tearing
-	 * in the extremely unlikely event of a GPU hang on this context
-	 * as we are querying them. If we need that extra layer of protection,
-	 * we should wrap the hangstats with a seqlock.
-	 */
-
-	if (capable(CAP_SYS_ADMIN))
-		args->reset_count = i915_reset_count(&dev_priv->gpu_error);
-	else
-		args->reset_count = 0;
-
-	args->batch_active = atomic_read(&ctx->guilty_count);
-	args->batch_pending = atomic_read(&ctx->active_count);
-
-	ret = 0;
-out:
-	rcu_read_unlock();
-	return ret;
-}
-
-int __i915_gem_context_pin_hw_id(struct i915_gem_context *ctx)
-{
-	struct drm_i915_private *i915 = ctx->i915;
-	int err = 0;
-
-	mutex_lock(&i915->contexts.mutex);
-
-	GEM_BUG_ON(i915_gem_context_is_closed(ctx));
-
-	if (list_empty(&ctx->hw_id_link)) {
-		GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count));
-
-		err = assign_hw_id(i915, &ctx->hw_id);
-		if (err)
-			goto out_unlock;
-
-		list_add_tail(&ctx->hw_id_link, &i915->contexts.hw_id_list);
-	}
-
-	GEM_BUG_ON(atomic_read(&ctx->hw_id_pin_count) == ~0u);
-	atomic_inc(&ctx->hw_id_pin_count);
-
-out_unlock:
-	mutex_unlock(&i915->contexts.mutex);
-	return err;
-}
-
-/* GEM context-engines iterator: for_each_gem_engine() */
-struct intel_context *
-i915_gem_engines_iter_next(struct i915_gem_engines_iter *it)
-{
-	const struct i915_gem_engines *e = it->engines;
-	struct intel_context *ctx;
-
-	do {
-		if (it->idx >= e->num_engines)
-			return NULL;
-
-		ctx = e->engines[it->idx++];
-	} while (!ctx);
-
-	return ctx;
-}
-
-#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
-#include "selftests/mock_context.c"
-#include "selftests/i915_gem_context.c"
-#endif
-
-static void i915_global_gem_context_shrink(void)
-{
-	kmem_cache_shrink(global.slab_luts);
-}
-
-static void i915_global_gem_context_exit(void)
-{
-	kmem_cache_destroy(global.slab_luts);
-}
-
-static struct i915_global_gem_context global = { {
-	.shrink = i915_global_gem_context_shrink,
-	.exit = i915_global_gem_context_exit,
-} };
-
-int __init i915_global_gem_context_init(void)
-{
-	global.slab_luts = KMEM_CACHE(i915_lut_handle, 0);
-	if (!global.slab_luts)
-		return -ENOMEM;
-
-	i915_global_register(&global.base);
-	return 0;
-}