From: Chris Wilson Date: Thu, 4 Aug 2016 06:52:45 +0000 (+0100) Subject: drm/i915: Release vma when the handle is closed X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b1f788c6acb2f34622dd5f4c3d5210c6e3945e78;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git drm/i915: Release vma when the handle is closed In order to prevent a leak of the vma on shared objects, we need to hook into the object_close callback to destroy the vma on the object for this file. However, if we destroyed that vma immediately we may cause unexpected application stalls as we try to unbind a busy vma - hence we defer the unbind to when we retire the vma. v2: Keep vma allocated until closed. This is useful for a later optimisation, but it is required now in order to handle potential recursion of i915_vma_unbind() by retiring itself. v3: Comments are important. Testcase: igt/gem_ppggtt/flink-and-close-vma-leak Signed-off-by: Chris Wilson Cc: Tvrtko Ursulin Cc: Daniele Ceraolo Spurio Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/1470293567-10811-26-git-send-email-chris@chris-wilson.co.uk --- diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 50c564089fa8..8cfc264ec9f6 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -2578,6 +2578,7 @@ static struct drm_driver driver = { .postclose = i915_driver_postclose, .set_busid = drm_pci_set_busid, + .gem_close_object = i915_gem_close_object, .gem_free_object = i915_gem_free_object, .gem_vm_ops = &i915_gem_vm_ops, diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index a1c4c768c0c3..f470ea195253 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -3014,8 +3014,8 @@ struct drm_i915_gem_object *i915_gem_object_create(struct drm_device *dev, size_t size); struct drm_i915_gem_object *i915_gem_object_create_from_data( struct drm_device *dev, const void *data, size_t size); +void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file); void i915_gem_free_object(struct drm_gem_object *obj); -void i915_gem_vma_destroy(struct i915_vma *vma); /* Flags used by pin/bind&friends. */ #define PIN_MAPPABLE (1<<0) @@ -3048,6 +3048,8 @@ 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); +void i915_vma_destroy(struct i915_vma *vma); int i915_gem_object_unbind(struct drm_i915_gem_object *obj); int i915_gem_object_put_pages(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 51660ceae147..5a66ad4bb1f2 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2596,6 +2596,19 @@ out_rearm: } } +void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file) +{ + struct drm_i915_gem_object *obj = to_intel_bo(gem); + struct drm_i915_file_private *fpriv = file->driver_priv; + struct i915_vma *vma, *vn; + + mutex_lock(&obj->base.dev->struct_mutex); + list_for_each_entry_safe(vma, vn, &obj->vma_list, obj_link) + if (vma->vm->file == fpriv) + i915_vma_close(vma); + mutex_unlock(&obj->base.dev->struct_mutex); +} + /** * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT * @dev: drm device pointer @@ -2803,26 +2816,32 @@ static int __i915_vma_unbind(struct i915_vma *vma, bool wait) if (active && wait) { int idx; + /* When a closed VMA is retired, it is unbound - eek. + * In order to prevent it from being recursively closed, + * take a pin on the vma so that the second unbind is + * aborted. + */ + vma->pin_count++; + for_each_active(active, idx) { ret = i915_gem_active_retire(&vma->last_read[idx], &vma->vm->dev->struct_mutex); if (ret) - return ret; + break; } + vma->pin_count--; + if (ret) + return ret; + GEM_BUG_ON(i915_vma_is_active(vma)); } if (vma->pin_count) return -EBUSY; - if (list_empty(&vma->obj_link)) - return 0; - - if (!drm_mm_node_allocated(&vma->node)) { - i915_gem_vma_destroy(vma); - return 0; - } + if (!drm_mm_node_allocated(&vma->node)) + goto destroy; GEM_BUG_ON(obj->bind_count == 0); GEM_BUG_ON(!obj->pages); @@ -2855,7 +2874,6 @@ static int __i915_vma_unbind(struct i915_vma *vma, bool wait) } drm_mm_remove_node(&vma->node); - i915_gem_vma_destroy(vma); /* Since the unbound list is global, only move to that list if * no more VMAs exist. */ @@ -2869,6 +2887,10 @@ static int __i915_vma_unbind(struct i915_vma *vma, bool wait) */ i915_gem_object_unpin_pages(obj); +destroy: + if (unlikely(vma->closed)) + i915_vma_destroy(vma); + return 0; } @@ -3043,7 +3065,7 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj, if (offset & (alignment - 1) || offset + size > end) { ret = -EINVAL; - goto err_free_vma; + goto err_vma; } vma->node.start = offset; vma->node.size = size; @@ -3055,7 +3077,7 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj, ret = drm_mm_reserve_node(&vm->mm, &vma->node); } if (ret) - goto err_free_vma; + goto err_vma; } else { if (flags & PIN_HIGH) { search_flag = DRM_MM_SEARCH_BELOW; @@ -3080,7 +3102,7 @@ search_free: if (ret == 0) goto search_free; - goto err_free_vma; + goto err_vma; } } if (WARN_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level))) { @@ -3101,8 +3123,7 @@ search_free: err_remove_node: drm_mm_remove_node(&vma->node); -err_free_vma: - i915_gem_vma_destroy(vma); +err_vma: vma = ERR_PTR(ret); err_unpin: i915_gem_object_unpin_pages(obj); @@ -4051,21 +4072,18 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj) trace_i915_gem_object_destroy(obj); + /* All file-owned VMA should have been released by this point through + * i915_gem_close_object(), or earlier by i915_gem_context_close(). + * However, the object may also be bound into the global GTT (e.g. + * older GPUs without per-process support, or for direct access through + * the GTT either for the user or for scanout). Those VMA still need to + * unbound now. + */ list_for_each_entry_safe(vma, next, &obj->vma_list, obj_link) { - int ret; - + GEM_BUG_ON(!vma->is_ggtt); + GEM_BUG_ON(i915_vma_is_active(vma)); vma->pin_count = 0; - ret = __i915_vma_unbind_no_wait(vma); - if (WARN_ON(ret == -ERESTARTSYS)) { - bool was_interruptible; - - was_interruptible = dev_priv->mm.interruptible; - dev_priv->mm.interruptible = false; - - WARN_ON(i915_vma_unbind(vma)); - - dev_priv->mm.interruptible = was_interruptible; - } + i915_vma_close(vma); } GEM_BUG_ON(obj->bind_count); @@ -4129,22 +4147,6 @@ struct i915_vma *i915_gem_obj_to_ggtt_view(struct drm_i915_gem_object *obj, return NULL; } -void i915_gem_vma_destroy(struct i915_vma *vma) -{ - WARN_ON(vma->node.allocated); - - /* Keep the vma as a placeholder in the execbuffer reservation lists */ - if (!list_empty(&vma->exec_list)) - return; - - if (!vma->is_ggtt) - i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm)); - - list_del(&vma->obj_link); - - kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma); -} - static void i915_gem_stop_engines(struct drm_device *dev) { diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c index 81f7b4383d5e..3437ced76cb6 100644 --- a/drivers/gpu/drm/i915/i915_gem_evict.c +++ b/drivers/gpu/drm/i915/i915_gem_evict.c @@ -182,8 +182,8 @@ found: struct i915_vma, exec_list); if (drm_mm_scan_remove_block(&vma->node)) { + vma->pin_count++; list_move(&vma->exec_list, &eviction_list); - i915_gem_object_get(vma->obj); continue; } list_del_init(&vma->exec_list); @@ -191,18 +191,14 @@ found: /* Unbinding will emit any required flushes */ while (!list_empty(&eviction_list)) { - struct drm_i915_gem_object *obj; - vma = list_first_entry(&eviction_list, struct i915_vma, exec_list); - obj = vma->obj; list_del_init(&vma->exec_list); + vma->pin_count--; if (ret == 0) ret = i915_vma_unbind(vma); - - i915_gem_object_put(obj); } return ret; diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 3e5d39dc7de0..3e9d735cf2c3 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -3342,6 +3342,31 @@ i915_vma_retire(struct i915_gem_active *active, return; list_move_tail(&vma->vm_link, &vma->vm->inactive_list); + if (unlikely(vma->closed && !vma->pin_count)) + WARN_ON(i915_vma_unbind(vma)); +} + +void i915_vma_destroy(struct i915_vma *vma) +{ + GEM_BUG_ON(vma->node.allocated); + GEM_BUG_ON(i915_vma_is_active(vma)); + GEM_BUG_ON(!vma->closed); + + list_del(&vma->vm_link); + if (!vma->is_ggtt) + i915_ppgtt_put(i915_vm_to_ppgtt(vma->vm)); + + kmem_cache_free(to_i915(vma->obj->base.dev)->vmas, vma); +} + +void i915_vma_close(struct i915_vma *vma) +{ + GEM_BUG_ON(vma->closed); + vma->closed = true; + + list_del_init(&vma->obj_link); + if (!i915_vma_is_active(vma) && !vma->pin_count) + WARN_ON(__i915_vma_unbind_no_wait(vma)); } static struct i915_vma * diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h index bfd3c112e33c..deb9dbcb9401 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.h +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h @@ -189,6 +189,7 @@ struct i915_vma { #define LOCAL_BIND (1<<1) unsigned int bound : 4; bool is_ggtt : 1; + bool closed : 1; /** * Support different GGTT views into the same object.