[PATCH 10/11] drm/i915: Mark the context and address space as closed

Chris Wilson
2015-12-14T11:38:46Z

When the user closes the context mark it and the dependent address space
as closed. As we use an asynchronous destruct method, this has two purposes.
First it allows us to flag the closed context and detect internal errors if
we to create any new objects for it (as it is removed from the user's
namespace, these should be internal bugs only). And secondly, it allows
us to immediately reap stale vma.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 4 ++++
drivers/gpu/drm/i915/i915_gem.c | 15 ++++++++-----
drivers/gpu/drm/i915/i915_gem_context.c | 39 +++++++++++++++++++++++++++++----
drivers/gpu/drm/i915/i915_gem_gtt.c | 11 +++++++---
drivers/gpu/drm/i915/i915_gem_gtt.h | 9 ++++++++
drivers/gpu/drm/i915/i915_gem_stolen.c | 2 +-
6 files changed, 66 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 696469a06715..66ecd6b3df95 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -892,6 +892,8 @@ struct intel_context {
} engine[I915_NUM_RINGS];

struct list_head link;
+
+ bool closed:1;
};

enum fb_op_origin {
@@ -2720,6 +2722,8 @@ int __must_check i915_vma_unbind(struct i915_vma *vma);
* _guarantee_ VMA in question is _not in use_ anywhere.
*/
int __must_check __i915_vma_unbind_no_wait(struct i915_vma *vma);
+void i915_vma_close(struct i915_vma *vma);
+
int i915_gem_object_put_pages(struct drm_i915_gem_object *obj);
void i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv);
void i915_gem_release_mmap(struct drm_i915_gem_object *obj);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 7c13c27a6470..08ea0b7eda8b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2367,12 +2367,13 @@ i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
return 0;
}

-static void i915_vma_close(struct i915_vma *vma)
+void i915_vma_close(struct i915_vma *vma)
{
RQ_BUG_ON(vma->closed);
vma->closed = true;

list_del_init(&vma->obj_link);
+ list_del_init(&vma->vm_link);
if (!vma->active)
WARN_ON(i915_vma_unbind(vma));
}
@@ -2620,12 +2621,13 @@ static int __i915_vma_unbind(struct i915_vma *vma, bool wait)
return ret;
}

- trace_i915_vma_unbind(vma);
-
- vma->vm->unbind_vma(vma);
+ if (likely(!vma->vm->closed)) {
+ trace_i915_vma_unbind(vma);
+ vma->vm->unbind_vma(vma);
+ }
vma->bound = 0;

- list_del_init(&vma->vm_link);
+ list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
if (vma->is_ggtt) {
if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
obj->map_and_fenceable = false;
@@ -2882,7 +2884,7 @@ search_free:
goto err_remove_node;

list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
- list_add_tail(&vma->vm_link, &vm->inactive_list);
+ list_move_tail(&vma->vm_link, &vm->inactive_list);

return vma;

@@ -3890,6 +3892,7 @@ void i915_gem_vma_destroy(struct i915_vma *vma)
if (!list_empty(&vma->exec_list))
return;

+ list_del(&vma->vm_link);
if (!vma->is_ggtt)
i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm));

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index c4a8a64cd1b2..9669547c7c2d 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -153,6 +153,7 @@ void i915_gem_context_free(struct kref *ctx_ref)
struct intel_context *ctx = container_of(ctx_ref, typeof(*ctx), ref);

trace_i915_context_free(ctx);
+ RQ_BUG_ON(!ctx->closed);

if (i915.enable_execlists)
intel_lr_context_free(ctx);
@@ -209,6 +210,36 @@ i915_gem_alloc_context_obj(struct drm_device *dev, size_t size)
return obj;
}

+static void i915_ppgtt_close(struct i915_address_space *vm)
+{
+ struct list_head *phases[] = {
+ &vm->active_list,
+ &vm->inactive_list,
+ &vm->unbound_list,
+ NULL,
+ }, **phase;
+
+ RQ_BUG_ON(vm->is_ggtt);
+ RQ_BUG_ON(vm->closed);
+ vm->closed = true;
+
+ for (phase = phases; *phase; phase++) {
+ struct i915_vma *vma, *vn;
+
+ list_for_each_entry_safe(vma, vn, *phase, vm_link)
+ i915_vma_close(vma);
+ }
+}
+
+static void context_close(struct intel_context *ctx)
+{
+ RQ_BUG_ON(ctx->closed);
+ ctx->closed = true;
+ if (ctx->ppgtt)
+ i915_ppgtt_close(&ctx->ppgtt->base);
+ i915_gem_context_unreference(ctx);
+}
+
static struct intel_context *
__create_hw_context(struct drm_device *dev,
struct drm_i915_file_private *file_priv)
@@ -256,7 +287,7 @@ __create_hw_context(struct drm_device *dev,
return ctx;

err_out:
- i915_gem_context_unreference(ctx);
+ context_close(ctx);
return ERR_PTR(ret);
}

@@ -318,7 +349,7 @@ err_unpin:
i915_gem_object_ggtt_unpin(ctx->legacy_hw_ctx.rcs_state);
err_destroy:
idr_remove(&file_priv->context_idr, ctx->user_handle);
- i915_gem_context_unreference(ctx);
+ context_close(ctx);
return ERR_PTR(ret);
}

@@ -470,7 +501,7 @@ static int context_idr_cleanup(int id, void *p, void *data)
{
struct intel_context *ctx = p;

- i915_gem_context_unreference(ctx);
+ context_close(ctx);
return 0;
}

@@ -894,7 +925,7 @@ int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
}

idr_remove(&ctx->file_priv->context_idr, ctx->user_handle);
- i915_gem_context_unreference(ctx);
+ context_close(ctx);
mutex_unlock(&dev->struct_mutex);

DRM_DEBUG_DRIVER("HW context %d destroyed\n", args->ctx_id);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 9f594c33bd0a..354236d72432 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2130,6 +2130,7 @@ static void i915_address_space_init(struct i915_address_space *vm,
vm->dev = dev_priv->dev;
INIT_LIST_HEAD(&vm->active_list);
INIT_LIST_HEAD(&vm->inactive_list);
+ INIT_LIST_HEAD(&vm->unbound_list);
list_add_tail(&vm->global_link, &dev_priv->vm_list);
}

@@ -2214,9 +2215,10 @@ void i915_ppgtt_release(struct kref *kref)

trace_i915_ppgtt_release(&ppgtt->base);

- /* vmas should already be unbound */
+ /* vmas should already be unbound and destroyed */
WARN_ON(!list_empty(&ppgtt->base.active_list));
WARN_ON(!list_empty(&ppgtt->base.inactive_list));
+ WARN_ON(!list_empty(&ppgtt->base.unbound_list));

list_del(&ppgtt->base.global_link);
drm_mm_takedown(&ppgtt->base.mm);
@@ -2698,7 +2700,7 @@ static int i915_gem_setup_global_gtt(struct drm_device *dev,
return ret;
}
vma->bound |= GLOBAL_BIND;
- list_add_tail(&vma->vm_link, &ggtt_vm->inactive_list);
+ list_move_tail(&vma->vm_link, &ggtt_vm->inactive_list);
}

/* Clear any non-preallocated blocks */
@@ -3252,6 +3254,8 @@ __i915_gem_vma_create(struct drm_i915_gem_object *obj,
struct i915_vma *vma;
int i;

+ RQ_BUG_ON(vm->closed);
+
if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view))
return ERR_PTR(-EINVAL);

@@ -3259,11 +3263,11 @@ __i915_gem_vma_create(struct drm_i915_gem_object *obj,
if (vma == NULL)
return ERR_PTR(-ENOMEM);

- INIT_LIST_HEAD(&vma->vm_link);
INIT_LIST_HEAD(&vma->obj_link);
INIT_LIST_HEAD(&vma->exec_list);
for (i = 0; i < ARRAY_SIZE(vma->last_read); i++)
init_request_active(&vma->last_read[i], i915_vma_retire);
+ list_add(&vma->vm_link, &vm->unbound_list);
vma->vm = vm;
vma->obj = obj;
vma->is_ggtt = i915_is_ggtt(vm);
@@ -3310,6 +3314,7 @@ i915_gem_obj_lookup_or_create_ggtt_vma(struct drm_i915_gem_object *obj,
if (!vma)
vma = __i915_gem_vma_create(obj, ggtt, view);

+ RQ_BUG_ON(vma->closed);
return vma;

}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index be7e8526b219..3bd2a4f4990c 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -284,6 +284,8 @@ struct i915_address_space {
u64 start; /* Start offset always 0 for dri2 */
u64 total; /* size addr space maps (ex. 2GB for ggtt) */

+ bool closed;
+
struct i915_page_scratch *scratch_page;
struct i915_page_table *scratch_pt;
struct i915_page_directory *scratch_pd;
@@ -312,6 +314,13 @@ struct i915_address_space {
*/
struct list_head inactive_list;

+ /**
+ * List of vma that have been unbound.
+ *
+ * A reference is not held on the buffer while on this list.
+ */
+ struct list_head unbound_list;
+
/* FIXME: Need a more generic return type */
gen6_pte_t (*pte_encode)(dma_addr_t addr,
enum i915_cache_level level,
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 305d58a5f745..4a803311f5bf 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -688,7 +688,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
}

vma->bound |= GLOBAL_BIND;
- list_add_tail(&vma->vm_link, &ggtt->inactive_list);
+ list_move_tail(&vma->vm_link, &ggtt->inactive_list);
}

list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
--
2.6.4