drm/i915: Move aliasing_ppgtt underneath its i915_ggtt

The aliasing_ppgtt provides a PIN_USER alias for the global gtt, so move
it under the i915_ggtt to simplify later transformations to enable
intel_context.vm.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190730143209.4549-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/i915_gem_context.c

@@ -459,8 +459,7 @@ __create_context(struct drm_i915_private *i915)
 	i915_gem_context_set_recoverable(ctx);
 
 	ctx->ring_size = 4 * PAGE_SIZE;
-	ctx->desc_template =
-		default_desc_template(i915, &i915->mm.aliasing_ppgtt->vm);
+	ctx->desc_template = default_desc_template(i915, NULL);
 
 	for (i = 0; i < ARRAY_SIZE(ctx->hang_timestamp); i++)
 		ctx->hang_timestamp[i] = jiffies - CONTEXT_FAST_HANG_JIFFIES;
@@ -2258,8 +2257,8 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 		args->size = 0;
 		if (ctx->vm)
 			args->value = ctx->vm->total;
-		else if (to_i915(dev)->mm.aliasing_ppgtt)
-			args->value = to_i915(dev)->mm.aliasing_ppgtt->vm.total;
+		else if (to_i915(dev)->ggtt.alias)
+			args->value = to_i915(dev)->ggtt.alias->vm.total;
 		else
 			args->value = to_i915(dev)->ggtt.vm.total;
 		break;

drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c

@@ -1190,7 +1190,7 @@ static int igt_ctx_readonly(void *arg)
 		goto out_unlock;
 	}
 
-	vm = ctx->vm ?: &i915->mm.aliasing_ppgtt->vm;
+	vm = ctx->vm ?: &i915->ggtt.alias->vm;
 	if (!vm || !vm->has_read_only) {
 		err = 0;
 		goto out_unlock;

drivers/gpu/drm/i915/gt/intel_ringbuffer.c

@@ -1376,30 +1376,41 @@ static void ring_context_destroy(struct kref *ref)
 	intel_context_free(ce);
 }
 
-static int __context_pin_ppgtt(struct i915_gem_context *ctx)
+static struct i915_address_space *vm_alias(struct intel_context *ce)
+{
+	struct i915_address_space *vm;
+
+	vm = ce->gem_context->vm;
+	if (!vm)
+		vm = &ce->engine->gt->ggtt->alias->vm;
+
+	return vm;
+}
+
+static int __context_pin_ppgtt(struct intel_context *ce)
 {
 	struct i915_address_space *vm;
 	int err = 0;
 
-	vm = ctx->vm ?: &ctx->i915->mm.aliasing_ppgtt->vm;
+	vm = vm_alias(ce);
 	if (vm)
 		err = gen6_ppgtt_pin(i915_vm_to_ppgtt((vm)));
 
 	return err;
 }
 
-static void __context_unpin_ppgtt(struct i915_gem_context *ctx)
+static void __context_unpin_ppgtt(struct intel_context *ce)
 {
 	struct i915_address_space *vm;
 
-	vm = ctx->vm ?: &ctx->i915->mm.aliasing_ppgtt->vm;
+	vm = vm_alias(ce);
 	if (vm)
 		gen6_ppgtt_unpin(i915_vm_to_ppgtt(vm));
 }
 
 static void ring_context_unpin(struct intel_context *ce)
 {
-	__context_unpin_ppgtt(ce->gem_context);
+	__context_unpin_ppgtt(ce);
 }
 
 static struct i915_vma *
@@ -1493,7 +1504,7 @@ static int ring_context_pin(struct intel_context *ce)
 	if (err)
 		return err;
 
-	err = __context_pin_ppgtt(ce->gem_context);
+	err = __context_pin_ppgtt(ce);
 	if (err)
 		goto err_active;
 
@@ -1685,7 +1696,7 @@ static inline int mi_set_context(struct i915_request *rq, u32 flags)
 	return 0;
 }
 
-static int remap_l3(struct i915_request *rq, int slice)
+static int remap_l3_slice(struct i915_request *rq, int slice)
 {
 	u32 *cs, *remap_info = rq->i915->l3_parity.remap_info[slice];
 	int i;
@@ -1713,15 +1724,34 @@ static int remap_l3(struct i915_request *rq, int slice)
 	return 0;
 }
 
+static int remap_l3(struct i915_request *rq)
+{
+	struct i915_gem_context *ctx = rq->gem_context;
+	int i, err;
+
+	if (!ctx->remap_slice)
+		return 0;
+
+	for (i = 0; i < MAX_L3_SLICES; i++) {
+		if (!(ctx->remap_slice & BIT(i)))
+			continue;
+
+		err = remap_l3_slice(rq, i);
+		if (err)
+			return err;
+	}
+
+	ctx->remap_slice = 0;
+	return 0;
+}
+
 static int switch_context(struct i915_request *rq)
 {
 	struct intel_engine_cs *engine = rq->engine;
-	struct i915_gem_context *ctx = rq->gem_context;
-	struct i915_address_space *vm =
-		ctx->vm ?: &rq->i915->mm.aliasing_ppgtt->vm;
+	struct i915_address_space *vm = vm_alias(rq->hw_context);
 	unsigned int unwind_mm = 0;
 	u32 hw_flags = 0;
-	int ret, i;
+	int ret;
 
 	GEM_BUG_ON(HAS_EXECLISTS(rq->i915));
 
@@ -1765,7 +1795,7 @@ static int switch_context(struct i915_request *rq)
 		 * as nothing actually executes using the kernel context; it
 		 * is purely used for flushing user contexts.
 		 */
-		if (i915_gem_context_is_kernel(ctx))
+		if (i915_gem_context_is_kernel(rq->gem_context))
 			hw_flags = MI_RESTORE_INHIBIT;
 
 		ret = mi_set_context(rq, hw_flags);
@@ -1799,18 +1829,9 @@ static int switch_context(struct i915_request *rq)
 			goto err_mm;
 	}
 
-	if (ctx->remap_slice) {
-		for (i = 0; i < MAX_L3_SLICES; i++) {
-			if (!(ctx->remap_slice & BIT(i)))
-				continue;
-
-			ret = remap_l3(rq, i);
+	ret = remap_l3(rq);
 	if (ret)
 		goto err_mm;
-		}
-
-		ctx->remap_slice = 0;
-	}
 
 	return 0;
 

drivers/gpu/drm/i915/i915_drv.h

@@ -784,9 +784,6 @@ struct i915_gem_mm {
 	 */
 	struct vfsmount *gemfs;
 
-	/** PPGTT used for aliasing the PPGTT with the GTT */
-	struct i915_ppgtt *aliasing_ppgtt;
-
 	struct notifier_block oom_notifier;
 	struct notifier_block vmap_notifier;
 	struct shrinker shrinker;

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -2446,18 +2446,18 @@ static int aliasing_gtt_bind_vma(struct i915_vma *vma,
 		pte_flags |= PTE_READ_ONLY;
 
 	if (flags & I915_VMA_LOCAL_BIND) {
-		struct i915_ppgtt *appgtt = i915->mm.aliasing_ppgtt;
+		struct i915_ppgtt *alias = i915_vm_to_ggtt(vma->vm)->alias;
 
 		if (!(vma->flags & I915_VMA_LOCAL_BIND)) {
-			ret = appgtt->vm.allocate_va_range(&appgtt->vm,
+			ret = alias->vm.allocate_va_range(&alias->vm,
 							  vma->node.start,
 							  vma->size);
 			if (ret)
 				return ret;
 		}
 
-		appgtt->vm.insert_entries(&appgtt->vm, vma, cache_level,
-					  pte_flags);
+		alias->vm.insert_entries(&alias->vm, vma,
+					 cache_level, pte_flags);
 	}
 
 	if (flags & I915_VMA_GLOBAL_BIND) {
@@ -2485,7 +2485,8 @@ static void aliasing_gtt_unbind_vma(struct i915_vma *vma)
 	}
 
 	if (vma->flags & I915_VMA_LOCAL_BIND) {
-		struct i915_address_space *vm = &i915->mm.aliasing_ppgtt->vm;
+		struct i915_address_space *vm =
+			&i915_vm_to_ggtt(vma->vm)->alias->vm;
 
 		vm->clear_range(vm, vma->node.start, vma->size);
 	}
@@ -2542,13 +2543,12 @@ static void i915_gtt_color_adjust(const struct drm_mm_node *node,
 		*end -= I915_GTT_PAGE_SIZE;
 }
 
-static int init_aliasing_ppgtt(struct drm_i915_private *i915)
+static int init_aliasing_ppgtt(struct i915_ggtt *ggtt)
 {
-	struct i915_ggtt *ggtt = &i915->ggtt;
 	struct i915_ppgtt *ppgtt;
 	int err;
 
-	ppgtt = i915_ppgtt_create(i915);
+	ppgtt = i915_ppgtt_create(ggtt->vm.i915);
 	if (IS_ERR(ppgtt))
 		return PTR_ERR(ppgtt);
 
@@ -2567,7 +2567,7 @@ static int init_aliasing_ppgtt(struct drm_i915_private *i915)
 	if (err)
 		goto err_ppgtt;
 
-	i915->mm.aliasing_ppgtt = ppgtt;
+	ggtt->alias = ppgtt;
 
 	GEM_BUG_ON(ggtt->vm.vma_ops.bind_vma != ggtt_bind_vma);
 	ggtt->vm.vma_ops.bind_vma = aliasing_gtt_bind_vma;
@@ -2582,14 +2582,14 @@ static int init_aliasing_ppgtt(struct drm_i915_private *i915)
 	return err;
 }
 
-static void fini_aliasing_ppgtt(struct drm_i915_private *i915)
+static void fini_aliasing_ppgtt(struct i915_ggtt *ggtt)
 {
-	struct i915_ggtt *ggtt = &i915->ggtt;
+	struct drm_i915_private *i915 = ggtt->vm.i915;
 	struct i915_ppgtt *ppgtt;
 
 	mutex_lock(&i915->drm.struct_mutex);
 
-	ppgtt = fetch_and_zero(&i915->mm.aliasing_ppgtt);
+	ppgtt = fetch_and_zero(&ggtt->alias);
 	if (!ppgtt)
 		goto out;
 
@@ -2706,7 +2706,7 @@ int i915_init_ggtt(struct drm_i915_private *i915)
 		return ret;
 
 	if (INTEL_PPGTT(i915) == INTEL_PPGTT_ALIASING) {
-		ret = init_aliasing_ppgtt(i915);
+		ret = init_aliasing_ppgtt(&i915->ggtt);
 		if (ret)
 			cleanup_init_ggtt(&i915->ggtt);
 	}
@@ -2755,7 +2755,7 @@ void i915_ggtt_driver_release(struct drm_i915_private *i915)
 {
 	struct pagevec *pvec;
 
-	fini_aliasing_ppgtt(i915);
+	fini_aliasing_ppgtt(&i915->ggtt);
 
 	ggtt_cleanup_hw(&i915->ggtt);
 
@@ -3588,7 +3588,7 @@ int i915_gem_gtt_reserve(struct i915_address_space *vm,
 	GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
 	GEM_BUG_ON(!IS_ALIGNED(offset, I915_GTT_MIN_ALIGNMENT));
 	GEM_BUG_ON(range_overflows(offset, size, vm->total));
-	GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->vm);
+	GEM_BUG_ON(vm == &vm->i915->ggtt.alias->vm);
 	GEM_BUG_ON(drm_mm_node_allocated(node));
 
 	node->size = size;
@@ -3685,7 +3685,7 @@ int i915_gem_gtt_insert(struct i915_address_space *vm,
 	GEM_BUG_ON(start >= end);
 	GEM_BUG_ON(start > 0  && !IS_ALIGNED(start, I915_GTT_PAGE_SIZE));
 	GEM_BUG_ON(end < U64_MAX && !IS_ALIGNED(end, I915_GTT_PAGE_SIZE));
-	GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->vm);
+	GEM_BUG_ON(vm == &vm->i915->ggtt.alias->vm);
 	GEM_BUG_ON(drm_mm_node_allocated(node));
 
 	if (unlikely(range_overflows(start, size, end)))

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -394,6 +394,9 @@ struct i915_ggtt {
 	void __iomem *gsm;
 	void (*invalidate)(struct i915_ggtt *ggtt);
 
+	/** PPGTT used for aliasing the PPGTT with the GTT */
+	struct i915_ppgtt *alias;
+
 	bool do_idle_maps;
 
 	int mtrr;

drivers/gpu/drm/i915/i915_vma.c

@@ -104,7 +104,7 @@ vma_create(struct drm_i915_gem_object *obj,
 	struct rb_node *rb, **p;
 
 	/* The aliasing_ppgtt should never be used directly! */
-	GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->vm);
+	GEM_BUG_ON(vm == &vm->i915->ggtt.alias->vm);
 
 	vma = i915_vma_alloc();
 	if (vma == NULL)