提交 fbd5a26d 编写于 作者: C Chris Wilson

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: NChris Wilson <chris@chris-wilson.co.uk>
上级 b5e4feb6
...@@ -635,9 +635,7 @@ fast_user_write(struct io_mapping *mapping, ...@@ -635,9 +635,7 @@ fast_user_write(struct io_mapping *mapping,
unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset, unwritten = __copy_from_user_inatomic_nocache(vaddr_atomic + page_offset,
user_data, length); user_data, length);
io_mapping_unmap_atomic(vaddr_atomic, KM_USER0); io_mapping_unmap_atomic(vaddr_atomic, KM_USER0);
if (unwritten) return unwritten;
return -EFAULT;
return 0;
} }
/* Here's the write path which can sleep for /* Here's the write path which can sleep for
...@@ -670,14 +668,14 @@ fast_shmem_write(struct page **pages, ...@@ -670,14 +668,14 @@ fast_shmem_write(struct page **pages,
char __user *data, char __user *data,
int length) int length)
{ {
int unwritten;
char *vaddr; char *vaddr;
int ret;
vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0); vaddr = kmap_atomic(pages[page_base >> PAGE_SHIFT], KM_USER0);
unwritten = __copy_from_user_inatomic(vaddr + page_offset, data, length); ret = __copy_from_user_inatomic(vaddr + page_offset, data, length);
kunmap_atomic(vaddr, KM_USER0); kunmap_atomic(vaddr, KM_USER0);
return unwritten ? -EFAULT : 0; return ret;
} }
/** /**
...@@ -695,24 +693,10 @@ i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -695,24 +693,10 @@ i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
loff_t offset, page_base; loff_t offset, page_base;
char __user *user_data; char __user *user_data;
int page_offset, page_length; int page_offset, page_length;
int ret;
user_data = (char __user *) (uintptr_t) args->data_ptr; user_data = (char __user *) (uintptr_t) args->data_ptr;
remain = args->size; remain = args->size;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ret;
ret = i915_gem_object_pin(obj, 0);
if (ret) {
mutex_unlock(&dev->struct_mutex);
return ret;
}
ret = i915_gem_object_set_to_gtt_domain(obj, 1);
if (ret)
goto fail;
obj_priv = to_intel_bo(obj); obj_priv = to_intel_bo(obj);
offset = obj_priv->gtt_offset + args->offset; offset = obj_priv->gtt_offset + args->offset;
...@@ -729,26 +713,21 @@ i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -729,26 +713,21 @@ i915_gem_gtt_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
if ((page_offset + remain) > PAGE_SIZE) if ((page_offset + remain) > PAGE_SIZE)
page_length = PAGE_SIZE - page_offset; page_length = PAGE_SIZE - page_offset;
ret = fast_user_write (dev_priv->mm.gtt_mapping, page_base,
page_offset, user_data, page_length);
/* If we get a fault while copying data, then (presumably) our /* If we get a fault while copying data, then (presumably) our
* source page isn't available. Return the error and we'll * source page isn't available. Return the error and we'll
* retry in the slow path. * retry in the slow path.
*/ */
if (ret) if (fast_user_write(dev_priv->mm.gtt_mapping, page_base,
goto fail; page_offset, user_data, page_length))
return -EFAULT;
remain -= page_length; remain -= page_length;
user_data += page_length; user_data += page_length;
offset += page_length; offset += page_length;
} }
fail: return 0;
i915_gem_object_unpin(obj);
mutex_unlock(&dev->struct_mutex);
return ret;
} }
/** /**
...@@ -785,30 +764,24 @@ i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -785,30 +764,24 @@ i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE; last_data_page = (data_ptr + args->size - 1) / PAGE_SIZE;
num_pages = last_data_page - first_data_page + 1; num_pages = last_data_page - first_data_page + 1;
user_pages = drm_calloc_large(num_pages, sizeof(struct page *)); user_pages = drm_malloc_ab(num_pages, sizeof(struct page *));
if (user_pages == NULL) if (user_pages == NULL)
return -ENOMEM; return -ENOMEM;
mutex_unlock(&dev->struct_mutex);
down_read(&mm->mmap_sem); down_read(&mm->mmap_sem);
pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr, pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
num_pages, 0, 0, user_pages, NULL); num_pages, 0, 0, user_pages, NULL);
up_read(&mm->mmap_sem); up_read(&mm->mmap_sem);
mutex_lock(&dev->struct_mutex);
if (pinned_pages < num_pages) { if (pinned_pages < num_pages) {
ret = -EFAULT; ret = -EFAULT;
goto out_unpin_pages; goto out_unpin_pages;
} }
ret = i915_mutex_lock_interruptible(dev);
if (ret)
goto out_unpin_pages;
ret = i915_gem_object_pin(obj, 0);
if (ret)
goto out_unlock;
ret = i915_gem_object_set_to_gtt_domain(obj, 1); ret = i915_gem_object_set_to_gtt_domain(obj, 1);
if (ret) if (ret)
goto out_unpin_object; goto out_unpin_pages;
obj_priv = to_intel_bo(obj); obj_priv = to_intel_bo(obj);
offset = obj_priv->gtt_offset + args->offset; offset = obj_priv->gtt_offset + args->offset;
...@@ -844,10 +817,6 @@ i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -844,10 +817,6 @@ i915_gem_gtt_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
data_ptr += page_length; data_ptr += page_length;
} }
out_unpin_object:
i915_gem_object_unpin(obj);
out_unlock:
mutex_unlock(&dev->struct_mutex);
out_unpin_pages: out_unpin_pages:
for (i = 0; i < pinned_pages; i++) for (i = 0; i < pinned_pages; i++)
page_cache_release(user_pages[i]); page_cache_release(user_pages[i]);
...@@ -870,23 +839,10 @@ i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -870,23 +839,10 @@ i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
loff_t offset, page_base; loff_t offset, page_base;
char __user *user_data; char __user *user_data;
int page_offset, page_length; int page_offset, page_length;
int ret;
user_data = (char __user *) (uintptr_t) args->data_ptr; user_data = (char __user *) (uintptr_t) args->data_ptr;
remain = args->size; remain = args->size;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ret;
ret = i915_gem_object_get_pages(obj, 0);
if (ret != 0)
goto fail_unlock;
ret = i915_gem_object_set_to_cpu_domain(obj, 1);
if (ret != 0)
goto fail_put_pages;
obj_priv = to_intel_bo(obj); obj_priv = to_intel_bo(obj);
offset = args->offset; offset = args->offset;
obj_priv->dirty = 1; obj_priv->dirty = 1;
...@@ -904,23 +860,17 @@ i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -904,23 +860,17 @@ i915_gem_shmem_pwrite_fast(struct drm_device *dev, struct drm_gem_object *obj,
if ((page_offset + remain) > PAGE_SIZE) if ((page_offset + remain) > PAGE_SIZE)
page_length = PAGE_SIZE - page_offset; page_length = PAGE_SIZE - page_offset;
ret = fast_shmem_write(obj_priv->pages, if (fast_shmem_write(obj_priv->pages,
page_base, page_offset, page_base, page_offset,
user_data, page_length); user_data, page_length))
if (ret) return -EFAULT;
goto fail_put_pages;
remain -= page_length; remain -= page_length;
user_data += page_length; user_data += page_length;
offset += page_length; offset += page_length;
} }
fail_put_pages: return 0;
i915_gem_object_put_pages(obj);
fail_unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
} }
/** /**
...@@ -962,28 +912,22 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -962,28 +912,22 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
if (user_pages == NULL) if (user_pages == NULL)
return -ENOMEM; return -ENOMEM;
mutex_unlock(&dev->struct_mutex);
down_read(&mm->mmap_sem); down_read(&mm->mmap_sem);
pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr, pinned_pages = get_user_pages(current, mm, (uintptr_t)args->data_ptr,
num_pages, 0, 0, user_pages, NULL); num_pages, 0, 0, user_pages, NULL);
up_read(&mm->mmap_sem); up_read(&mm->mmap_sem);
mutex_lock(&dev->struct_mutex);
if (pinned_pages < num_pages) { if (pinned_pages < num_pages) {
ret = -EFAULT; ret = -EFAULT;
goto fail_put_user_pages; goto out;
} }
do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj); ret = i915_gem_object_set_to_cpu_domain(obj, 1);
ret = i915_mutex_lock_interruptible(dev);
if (ret)
goto fail_put_user_pages;
ret = i915_gem_object_get_pages_or_evict(obj);
if (ret) if (ret)
goto fail_unlock; goto out;
ret = i915_gem_object_set_to_cpu_domain(obj, 1); do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
if (ret != 0)
goto fail_put_pages;
obj_priv = to_intel_bo(obj); obj_priv = to_intel_bo(obj);
offset = args->offset; offset = args->offset;
...@@ -1029,11 +973,7 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -1029,11 +973,7 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
offset += page_length; offset += page_length;
} }
fail_put_pages: out:
i915_gem_object_put_pages(obj);
fail_unlock:
mutex_unlock(&dev->struct_mutex);
fail_put_user_pages:
for (i = 0; i < pinned_pages; i++) for (i = 0; i < pinned_pages; i++)
page_cache_release(user_pages[i]); page_cache_release(user_pages[i]);
drm_free_large(user_pages); drm_free_large(user_pages);
...@@ -1048,18 +988,24 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj, ...@@ -1048,18 +988,24 @@ i915_gem_shmem_pwrite_slow(struct drm_device *dev, struct drm_gem_object *obj,
*/ */
int int
i915_gem_pwrite_ioctl(struct drm_device *dev, void *data, i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv) struct drm_file *file)
{ {
struct drm_i915_gem_pwrite *args = data; struct drm_i915_gem_pwrite *args = data;
struct drm_gem_object *obj; struct drm_gem_object *obj;
struct drm_i915_gem_object *obj_priv; struct drm_i915_gem_object *obj_priv;
int ret = 0; int ret = 0;
obj = drm_gem_object_lookup(dev, file_priv, args->handle); obj = drm_gem_object_lookup(dev, file, args->handle);
if (obj == NULL) if (obj == NULL)
return -ENOENT; return -ENOENT;
obj_priv = to_intel_bo(obj); obj_priv = to_intel_bo(obj);
ret = i915_mutex_lock_interruptible(dev);
if (ret) {
drm_gem_object_unreference_unlocked(obj);
return ret;
}
/* Bounds check destination. */ /* Bounds check destination. */
if (args->offset > obj->size || args->size > obj->size - args->offset) { if (args->offset > obj->size || args->size > obj->size - args->offset) {
ret = -EINVAL; ret = -EINVAL;
...@@ -1090,32 +1036,46 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data, ...@@ -1090,32 +1036,46 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
* perspective, requiring manual detiling by the client. * perspective, requiring manual detiling by the client.
*/ */
if (obj_priv->phys_obj) if (obj_priv->phys_obj)
ret = i915_gem_phys_pwrite(dev, obj, args, file_priv); ret = i915_gem_phys_pwrite(dev, obj, args, file);
else if (obj_priv->tiling_mode == I915_TILING_NONE && else if (obj_priv->tiling_mode == I915_TILING_NONE &&
obj_priv->gtt_space && obj_priv->gtt_space &&
obj->write_domain != I915_GEM_DOMAIN_CPU) { obj->write_domain != I915_GEM_DOMAIN_CPU) {
ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file_priv); ret = i915_gem_object_pin(obj, 0);
if (ret == -EFAULT) { if (ret)
ret = i915_gem_gtt_pwrite_slow(dev, obj, args, goto out;
file_priv);
} ret = i915_gem_object_set_to_gtt_domain(obj, 1);
} else if (i915_gem_object_needs_bit17_swizzle(obj)) { if (ret)
ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file_priv); goto out_unpin;
ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file);
if (ret == -EFAULT)
ret = i915_gem_gtt_pwrite_slow(dev, obj, args, file);
out_unpin:
i915_gem_object_unpin(obj);
} else { } else {
ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file_priv); ret = i915_gem_object_get_pages_or_evict(obj);
if (ret == -EFAULT) { if (ret)
ret = i915_gem_shmem_pwrite_slow(dev, obj, args, goto out;
file_priv);
}
}
#if WATCH_PWRITE ret = i915_gem_object_set_to_cpu_domain(obj, 1);
if (ret) if (ret)
DRM_INFO("pwrite failed %d\n", ret); goto out_put;
#endif
ret = -EFAULT;
if (!i915_gem_object_needs_bit17_swizzle(obj))
ret = i915_gem_shmem_pwrite_fast(dev, obj, args, file);
if (ret == -EFAULT)
ret = i915_gem_shmem_pwrite_slow(dev, obj, args, file);
out_put:
i915_gem_object_put_pages(obj);
}
out: out:
drm_gem_object_unreference_unlocked(obj); drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);
return ret; return ret;
} }
......
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