forked from Minki/linux
drm/i915: Rearrange acquisition of mutex during pwrite
... to avoid reacquiring it to drop the object reference count on exit. Note we have to make sure we now drop (and reacquire) the lock around acquiring the mm semaphore on the slow paths. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
parent
b5e4feb661
commit
fbd5a26d50
@ -635,9 +635,7 @@ fast_user_write(struct io_mapping *mapping,
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unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset,
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user_data, length);
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io_mapping_unmap_atomic(vaddr_atomic, KM_USER0);
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if (unwritten)
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return -EFAULT;
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return 0;
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return unwritten;
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}
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/* Here's the write path which can sleep for
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@ -670,14 +668,14 @@ fast_shmem_write(struct page **pages,
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char __user *data,
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int length)
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{
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int unwritten;
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char *vaddr;
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int ret;
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vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0);
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unwritten = __copy_from_user_inatomic(vaddr + page_offset, data, length);
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ret = __copy_from_user_inatomic(vaddr + page_offset, data, length);
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kunmap_atomic(vaddr, KM_USER0);
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return unwritten ? -EFAULT : 0;
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return ret;
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}
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/**
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@ -695,24 +693,10 @@ i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
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loff_t offset, page_base;
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char __user *user_data;
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int page_offset, page_length;
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int ret;
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user_data = (char __user *) (uintptr_t) args->data_ptr;
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remain = args->size;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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return ret;
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ret = i915_gem_object_pin(obj, 0);
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if (ret) {
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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ret = i915_gem_object_set_to_gtt_domain(obj, 1);
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if (ret)
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goto fail;
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obj_priv = to_intel_bo(obj);
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offset = obj_priv->gtt_offset + args->offset;
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@ -729,26 +713,21 @@ i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
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if ((page_offset + remain) > PAGE_SIZE)
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page_length = PAGE_SIZE - page_offset;
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ret = fast_user_write (dev_priv->mm.gtt_mapping, page_base,
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page_offset, user_data, page_length);
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/* If we get a fault while copying data, then (presumably) our
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* source page isn't available. Return the error and we'll
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* retry in the slow path.
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*/
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if (ret)
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goto fail;
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if (fast_user_write(dev_priv->mm.gtt_mapping, page_base,
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page_offset, user_data, page_length))
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return -EFAULT;
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remain -= page_length;
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user_data += page_length;
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offset += page_length;
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}
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fail:
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i915_gem_object_unpin(obj);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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return 0;
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}
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/**
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@ -785,30 +764,24 @@ i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
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last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
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num_pages = last_data_page - first_data_page + 1;
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user_pages = drm_calloc_large(num_pages, sizeof(struct page *));
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user_pages = drm_malloc_ab(num_pages, sizeof(struct page *));
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if (user_pages == NULL)
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return -ENOMEM;
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mutex_unlock(&dev->struct_mutex);
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down_read(&mm->mmap_sem);
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pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
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num_pages, 0, 0, user_pages, NULL);
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up_read(&mm->mmap_sem);
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mutex_lock(&dev->struct_mutex);
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if (pinned_pages < num_pages) {
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ret = -EFAULT;
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goto out_unpin_pages;
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}
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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goto out_unpin_pages;
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ret = i915_gem_object_pin(obj, 0);
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if (ret)
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goto out_unlock;
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ret = i915_gem_object_set_to_gtt_domain(obj, 1);
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if (ret)
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goto out_unpin_object;
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goto out_unpin_pages;
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obj_priv = to_intel_bo(obj);
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offset = obj_priv->gtt_offset + args->offset;
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@ -844,10 +817,6 @@ i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
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data_ptr += page_length;
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}
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out_unpin_object:
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i915_gem_object_unpin(obj);
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out_unlock:
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mutex_unlock(&dev->struct_mutex);
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out_unpin_pages:
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for (i = 0; i < pinned_pages; i++)
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page_cache_release(user_pages[i]);
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@ -870,23 +839,10 @@ i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
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loff_t offset, page_base;
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char __user *user_data;
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int page_offset, page_length;
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int ret;
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user_data = (char __user *) (uintptr_t) args->data_ptr;
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remain = args->size;
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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return ret;
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ret = i915_gem_object_get_pages(obj, 0);
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if (ret != 0)
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goto fail_unlock;
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ret = i915_gem_object_set_to_cpu_domain(obj, 1);
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if (ret != 0)
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goto fail_put_pages;
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obj_priv = to_intel_bo(obj);
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offset = args->offset;
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obj_priv->dirty = 1;
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@ -904,23 +860,17 @@ i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
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if ((page_offset + remain) > PAGE_SIZE)
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page_length = PAGE_SIZE - page_offset;
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ret = fast_shmem_write(obj_priv->pages,
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if (fast_shmem_write(obj_priv->pages,
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page_base, page_offset,
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user_data, page_length);
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if (ret)
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goto fail_put_pages;
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user_data, page_length))
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return -EFAULT;
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remain -= page_length;
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user_data += page_length;
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offset += page_length;
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}
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fail_put_pages:
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i915_gem_object_put_pages(obj);
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fail_unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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return 0;
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}
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/**
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@ -962,28 +912,22 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
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if (user_pages == NULL)
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return -ENOMEM;
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mutex_unlock(&dev->struct_mutex);
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down_read(&mm->mmap_sem);
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pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
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num_pages, 0, 0, user_pages, NULL);
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up_read(&mm->mmap_sem);
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mutex_lock(&dev->struct_mutex);
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if (pinned_pages < num_pages) {
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ret = -EFAULT;
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goto fail_put_user_pages;
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goto out;
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}
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do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret)
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goto fail_put_user_pages;
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ret = i915_gem_object_get_pages_or_evict(obj);
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if (ret)
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goto fail_unlock;
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ret = i915_gem_object_set_to_cpu_domain(obj, 1);
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if (ret != 0)
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goto fail_put_pages;
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if (ret)
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goto out;
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do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
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obj_priv = to_intel_bo(obj);
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offset = args->offset;
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@ -1029,11 +973,7 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
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offset += page_length;
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}
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fail_put_pages:
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i915_gem_object_put_pages(obj);
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fail_unlock:
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mutex_unlock(&dev->struct_mutex);
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fail_put_user_pages:
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out:
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for (i = 0; i < pinned_pages; i++)
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page_cache_release(user_pages[i]);
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drm_free_large(user_pages);
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@ -1048,18 +988,24 @@ fail_put_user_pages:
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*/
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int
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i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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struct drm_file *file)
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{
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struct drm_i915_gem_pwrite *args = data;
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struct drm_gem_object *obj;
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struct drm_i915_gem_object *obj_priv;
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int ret = 0;
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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obj = drm_gem_object_lookup(dev, file, args->handle);
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if (obj == NULL)
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return -ENOENT;
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obj_priv = to_intel_bo(obj);
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ret = i915_mutex_lock_interruptible(dev);
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if (ret) {
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drm_gem_object_unreference_unlocked(obj);
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return ret;
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}
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/* Bounds check destination. */
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if (args->offset > obj->size || args->size > obj->size - args->offset) {
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ret = -EINVAL;
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@ -1090,32 +1036,46 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
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* perspective, requiring manual detiling by the client.
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*/
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if (obj_priv->phys_obj)
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ret = i915_gem_phys_pwrite(dev, obj, args, file_priv);
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ret = i915_gem_phys_pwrite(dev, obj, args, file);
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else if (obj_priv->tiling_mode == I915_TILING_NONE &&
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obj_priv->gtt_space &&
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obj->write_domain != I915_GEM_DOMAIN_CPU) {
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ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file_priv);
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if (ret == -EFAULT) {
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ret = i915_gem_gtt_pwrite_slow(dev, obj, args,
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file_priv);
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}
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} else if (i915_gem_object_needs_bit17_swizzle(obj)) {
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ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file_priv);
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ret = i915_gem_object_pin(obj, 0);
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if (ret)
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goto out;
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ret = i915_gem_object_set_to_gtt_domain(obj, 1);
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if (ret)
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goto out_unpin;
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ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file);
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if (ret == -EFAULT)
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ret = i915_gem_gtt_pwrite_slow(dev, obj, args, file);
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out_unpin:
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i915_gem_object_unpin(obj);
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} else {
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ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file_priv);
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if (ret == -EFAULT) {
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ret = i915_gem_shmem_pwrite_slow(dev, obj, args,
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file_priv);
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}
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ret = i915_gem_object_get_pages_or_evict(obj);
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if (ret)
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goto out;
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ret = i915_gem_object_set_to_cpu_domain(obj, 1);
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if (ret)
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goto out_put;
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ret = -EFAULT;
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if (!i915_gem_object_needs_bit17_swizzle(obj))
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ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file);
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if (ret == -EFAULT)
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ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file);
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out_put:
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i915_gem_object_put_pages(obj);
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}
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#if WATCH_PWRITE
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if (ret)
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DRM_INFO("pwrite failed %d\n", ret);
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#endif
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out:
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drm_gem_object_unreference_unlocked(obj);
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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