Commit 5c3f8c22 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Track vma activity per fence.context, not per engine 



In the next patch, we will want to be able to use more flexible request
timelines that can hop between engines. From the vma pov, we can then
not rely on the binding of this request to an engine and so can not
ensure that different requests are ordered through a per-engine
timeline, and so we must track activity of all timelines. (We track
activity on the vma itself to prevent unbinding from HW before the HW
has finished accessing it.)

v2: Switch to a rbtree for 32b safety (since using u64 as a radixtree
index is fraught with aliasing of unsigned longs).
v3: s/lookup_active/active_instance/ because we can never agree on names

Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180706103947.15919-5-chris@chris-wilson.co.uk
parent e6bb1d7f

drivers/gpu/drm/i915/i915_gem_gtt.c

+2 −3
Original line number Diff line number Diff line
@@ -2074,7 +2074,6 @@ static struct i915_vma *pd_vma_create(struct gen6_hw_ppgtt *ppgtt, int size) 
	struct drm_i915_private *i915 = ppgtt->base.vm.i915;

	struct i915_ggtt *ggtt = &i915->ggtt;

	struct i915_vma *vma;

	int i;



	GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));

	GEM_BUG_ON(size > ggtt->vm.total);
@@ -2083,14 +2082,14 @@ static struct i915_vma *pd_vma_create(struct gen6_hw_ppgtt *ppgtt, int size) 
	if (!vma)

		return ERR_PTR(-ENOMEM);



	for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)

		init_request_active(&vma->last_read[i], NULL);

	init_request_active(&vma->last_fence, NULL);



	vma->vm = &ggtt->vm;

	vma->ops = &pd_vma_ops;

	vma->private = ppgtt;



	vma->active = RB_ROOT;



	vma->size = size;

	vma->fence_size = size;

	vma->flags = I915_VMA_GGTT;

drivers/gpu/drm/i915/i915_gpu_error.c

+3 −11
Original line number Diff line number Diff line
@@ -335,21 +335,16 @@ static void print_error_buffers(struct drm_i915_error_state_buf *m, 
				struct drm_i915_error_buffer *err,

				int count)

{

	int i;



	err_printf(m, "%s [%d]:\n", name, count);



	while (count--) {

		err_printf(m, "    %08x_%08x %8u %02x %02x [ ",

		err_printf(m, "    %08x_%08x %8u %02x %02x %02x",

			   upper_32_bits(err->gtt_offset),

			   lower_32_bits(err->gtt_offset),

			   err->size,

			   err->read_domains,

			   err->write_domain);

		for (i = 0; i < I915_NUM_ENGINES; i++)

			err_printf(m, "%02x ", err->rseqno[i]);



		err_printf(m, "] %02x", err->wseqno);

			   err->write_domain,

			   err->wseqno);

		err_puts(m, tiling_flag(err->tiling));

		err_puts(m, dirty_flag(err->dirty));

		err_puts(m, purgeable_flag(err->purgeable));
@@ -1021,13 +1016,10 @@ static void capture_bo(struct drm_i915_error_buffer *err, 
		       struct i915_vma *vma)

{

	struct drm_i915_gem_object *obj = vma->obj;

	int i;



	err->size = obj->base.size;

	err->name = obj->base.name;



	for (i = 0; i < I915_NUM_ENGINES; i++)

		err->rseqno[i] = __active_get_seqno(&vma->last_read[i]);

	err->wseqno = __active_get_seqno(&obj->frontbuffer_write);

	err->engine = __active_get_engine_id(&obj->frontbuffer_write);

drivers/gpu/drm/i915/i915_gpu_error.h

+1 −1
Original line number Diff line number Diff line
@@ -177,7 +177,7 @@ struct i915_gpu_state { 
	struct drm_i915_error_buffer {

		u32 size;

		u32 name;

		u32 rseqno[I915_NUM_ENGINES], wseqno;

		u32 wseqno;

		u64 gtt_offset;

		u32 read_domains;

		u32 write_domain;

drivers/gpu/drm/i915/i915_request.h

+1 −0
Original line number Diff line number Diff line
@@ -380,6 +380,7 @@ static inline void 
init_request_active(struct i915_gem_active *active,

		    i915_gem_retire_fn retire)

{

	RCU_INIT_POINTER(active->request, NULL);

	INIT_LIST_HEAD(&active->link);

	active->retire = retire ?: i915_gem_retire_noop;

}

drivers/gpu/drm/i915/i915_vma.c

+81 −31
Original line number Diff line number Diff line
@@ -63,18 +63,20 @@ static void vma_print_allocator(struct i915_vma *vma, const char *reason) 


#endif



struct i915_vma_active {

	struct i915_gem_active base;

	struct i915_vma *vma;

	struct rb_node node;

	u64 timeline;

};



static void

i915_vma_retire(struct i915_gem_active *active, struct i915_request *rq)

__i915_vma_retire(struct i915_vma *vma, struct i915_request *rq)

{

	const unsigned int idx = rq->engine->id;

	struct i915_vma *vma =

		container_of(active, struct i915_vma, last_read[idx]);

	struct drm_i915_gem_object *obj = vma->obj;



	GEM_BUG_ON(!i915_vma_has_active_engine(vma, idx));



	i915_vma_clear_active(vma, idx);

	if (i915_vma_is_active(vma))

	GEM_BUG_ON(!i915_vma_is_active(vma));

	if (--vma->active_count)

		return;



	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
@@ -108,6 +110,15 @@ i915_vma_retire(struct i915_gem_active *active, struct i915_request *rq) 
	}

}



static void

i915_vma_retire(struct i915_gem_active *base, struct i915_request *rq)

{

	struct i915_vma_active *active =

		container_of(base, typeof(*active), base);



	__i915_vma_retire(active->vma, rq);

}



static struct i915_vma *

vma_create(struct drm_i915_gem_object *obj,

	   struct i915_address_space *vm,
@@ -115,7 +126,6 @@ vma_create(struct drm_i915_gem_object *obj, 
{

	struct i915_vma *vma;

	struct rb_node *rb, **p;

	int i;



	/* The aliasing_ppgtt should never be used directly! */

	GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->vm);
@@ -124,8 +134,8 @@ vma_create(struct drm_i915_gem_object *obj, 
	if (vma == NULL)

		return ERR_PTR(-ENOMEM);



	for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)

		init_request_active(&vma->last_read[i], i915_vma_retire);

	vma->active = RB_ROOT;



	init_request_active(&vma->last_fence, NULL);

	vma->vm = vm;

	vma->ops = &vm->vma_ops;
@@ -778,13 +788,11 @@ void i915_vma_reopen(struct i915_vma *vma) 
static void __i915_vma_destroy(struct i915_vma *vma)

{

	struct drm_i915_private *i915 = vma->vm->i915;

	int i;

	struct i915_vma_active *iter, *n;



	GEM_BUG_ON(vma->node.allocated);

	GEM_BUG_ON(vma->fence);



	for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)

		GEM_BUG_ON(i915_gem_active_isset(&vma->last_read[i]));

	GEM_BUG_ON(i915_gem_active_isset(&vma->last_fence));



	list_del(&vma->obj_link);
@@ -795,6 +803,11 @@ static void __i915_vma_destroy(struct i915_vma *vma) 
	if (!i915_vma_is_ggtt(vma))

		i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm));



	rbtree_postorder_for_each_entry_safe(iter, n, &vma->active, node) {

		GEM_BUG_ON(i915_gem_active_isset(&iter->base));

		kfree(iter);

	}



	kmem_cache_free(i915->vmas, vma);

}
@@ -878,16 +891,54 @@ static void export_fence(struct i915_vma *vma, 
	reservation_object_unlock(resv);

}



static struct i915_gem_active *active_instance(struct i915_vma *vma, u64 idx)

{

	struct i915_vma_active *active;

	struct rb_node **p, *parent;



	parent = NULL;

	p = &vma->active.rb_node;

	while (*p) {

		parent = *p;



		active = rb_entry(parent, struct i915_vma_active, node);

		if (active->timeline == idx)

			return &active->base;



		if (active->timeline < idx)

			p = &parent->rb_right;

		else

			p = &parent->rb_left;

	}



	active = kmalloc(sizeof(*active), GFP_KERNEL);

	if (unlikely(!active))

		return ERR_PTR(-ENOMEM);



	init_request_active(&active->base, i915_vma_retire);

	active->vma = vma;

	active->timeline = idx;



	rb_link_node(&active->node, parent, p);

	rb_insert_color(&active->node, &vma->active);



	return &active->base;

}



int i915_vma_move_to_active(struct i915_vma *vma,

			    struct i915_request *rq,

			    unsigned int flags)

{

	struct drm_i915_gem_object *obj = vma->obj;

	const unsigned int idx = rq->engine->id;

	struct i915_gem_active *active;



	lockdep_assert_held(&rq->i915->drm.struct_mutex);

	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));



	active = active_instance(vma, rq->fence.context);

	if (IS_ERR(active))

		return PTR_ERR(active);



	/*

	 * Add a reference if we're newly entering the active list.

	 * The order in which we add operations to the retirement queue is
@@ -896,11 +947,13 @@ int i915_vma_move_to_active(struct i915_vma *vma, 
	 * add the active reference first and queue for it to be dropped

	 * *last*.

	 */

	if (!i915_vma_is_active(vma))

		obj->active_count++;

	i915_vma_set_active(vma, idx);

	i915_gem_active_set(&vma->last_read[idx], rq);

	if (!i915_gem_active_isset(active) && !vma->active_count++) {

		list_move_tail(&vma->vm_link, &vma->vm->active_list);

		obj->active_count++;

	}

	i915_gem_active_set(active, rq);

	GEM_BUG_ON(!i915_vma_is_active(vma));

	GEM_BUG_ON(!obj->active_count);



	obj->write_domain = 0;

	if (flags & EXEC_OBJECT_WRITE) {
@@ -922,7 +975,6 @@ int i915_vma_move_to_active(struct i915_vma *vma, 


int i915_vma_unbind(struct i915_vma *vma)

{

	unsigned long active;

	int ret;



	lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
@@ -932,9 +984,8 @@ int i915_vma_unbind(struct i915_vma *vma) 
	 * have side-effects such as unpinning or even unbinding this vma.

	 */

	might_sleep();

	active = i915_vma_get_active(vma);

	if (active) {

		int idx;

	if (i915_vma_is_active(vma)) {

		struct i915_vma_active *active, *n;



		/*

		 * When a closed VMA is retired, it is unbound - eek.
@@ -951,18 +1002,17 @@ int i915_vma_unbind(struct i915_vma *vma) 
		 */

		__i915_vma_pin(vma);



		for_each_active(active, idx) {

			ret = i915_gem_active_retire(&vma->last_read[idx],

		rbtree_postorder_for_each_entry_safe(active, n,

						     &vma->active, node) {

			ret = i915_gem_active_retire(&active->base,

						     &vma->vm->i915->drm.struct_mutex);

			if (ret)

				break;

				goto unpin;

		}



		if (!ret) {

		ret = i915_gem_active_retire(&vma->last_fence,

					     &vma->vm->i915->drm.struct_mutex);

		}



unpin:

		__i915_vma_unpin(vma);

		if (ret)

			return ret;

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