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dma-buf: Remove range-based flush

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This patch removes range-based information used for optimizations in
begin_cpu_access and end_cpu_access.

We don't have any user nor implementation using range-based flush. It seems a
consensus that if we ever want something like that again (or even more robust
using 2D, 3D sub-range regions) we can use the upcoming dma-buf sync ioctl for
such.

Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>
Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1450820214-12509-3-git-send-email-tiago.vignatti@intel.com
This commit is contained in:
Tiago Vignatti 2015-12-22 19:36:45 -02:00 committed by Daniel Vetter
parent bfe981a095
commit 831e9da7dc
8 changed files with 24 additions and 38 deletions
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19
Documentation/dma-buf-sharing.txt
View File

@ -257,17 +257,15 @@ Access to a dma_buf from the kernel context involves three steps:
Interface:
int dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
size_t start, size_t len,
enum dma_data_direction direction)
This allows the exporter to ensure that the memory is actually available for
cpu access - the exporter might need to allocate or swap-in and pin the
backing storage. The exporter also needs to ensure that cpu access is
coherent for the given range and access direction. The range and access
direction can be used by the exporter to optimize the cache flushing, i.e.
access outside of the range or with a different direction (read instead of
write) might return stale or even bogus data (e.g. when the exporter needs to
copy the data to temporary storage).
coherent for the access direction. The direction can be used by the exporter
to optimize the cache flushing, i.e. access with a different direction (read
instead of write) might return stale or even bogus data (e.g. when the
exporter needs to copy the data to temporary storage).
This step might fail, e.g. in oom conditions.
@ -322,14 +320,13 @@ Access to a dma_buf from the kernel context involves three steps:
3. Finish access
When the importer is done accessing the range specified in begin_cpu_access,
it needs to announce this to the exporter (to facilitate cache flushing and
unpinning of any pinned resources). The result of any dma_buf kmap calls
after end_cpu_access is undefined.
When the importer is done accessing the CPU, it needs to announce this to
the exporter (to facilitate cache flushing and unpinning of any pinned
resources). The result of any dma_buf kmap calls after end_cpu_access is
undefined.
Interface:
void dma_buf_end_cpu_access(struct dma_buf *dma_buf,
size_t start, size_t len,
enum dma_data_direction dir);

13
drivers/dma-buf/dma-buf.c
View File

@ -539,13 +539,11 @@ EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment);
* preparations. Coherency is only guaranteed in the specified range for the
* specified access direction.
* @dmabuf: [in] buffer to prepare cpu access for.
* @start: [in] start of range for cpu access.
* @len: [in] length of range for cpu access.
* @direction: [in] length of range for cpu access.
*
* Can return negative error values, returns 0 on success.
*/
int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len,
int dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
enum dma_data_direction direction)
{
int ret = 0;
@ -554,8 +552,7 @@ int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len,
return -EINVAL;
if (dmabuf->ops->begin_cpu_access)
ret = dmabuf->ops->begin_cpu_access(dmabuf, start,
len, direction);
ret = dmabuf->ops->begin_cpu_access(dmabuf, direction);
return ret;
}
@ -567,19 +564,17 @@ EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access);
* actions. Coherency is only guaranteed in the specified range for the
* specified access direction.
* @dmabuf: [in] buffer to complete cpu access for.
* @start: [in] start of range for cpu access.
* @len: [in] length of range for cpu access.
* @direction: [in] length of range for cpu access.
*
* This call must always succeed.
*/
void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len,
void dma_buf_end_cpu_access(struct dma_buf *dmabuf,
enum dma_data_direction direction)
{
WARN_ON(!dmabuf);
if (dmabuf->ops->end_cpu_access)
dmabuf->ops->end_cpu_access(dmabuf, start, len, direction);
dmabuf->ops->end_cpu_access(dmabuf, direction);
}
EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access);

2
drivers/gpu/drm/i915/i915_gem_dmabuf.c
View File

@ -196,7 +196,7 @@ static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *
return -EINVAL;
}
static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t length, enum dma_data_direction direction)
static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
struct drm_device *dev = obj->base.dev;

4
drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
View File

@ -79,7 +79,7 @@ static void omap_gem_dmabuf_release(struct dma_buf *buffer)
static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
size_t start, size_t len, enum dma_data_direction dir)
enum dma_data_direction dir)
{
struct drm_gem_object *obj = buffer->priv;
struct page **pages;
@ -94,7 +94,7 @@ static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
}
static void omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
size_t start, size_t len, enum dma_data_direction dir)
enum dma_data_direction dir)
{
struct drm_gem_object *obj = buffer->priv;
omap_gem_put_pages(obj);

2
drivers/gpu/drm/udl/udl_fb.c
View File

@ -409,7 +409,6 @@ static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
if (ufb->obj->base.import_attach) {
ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
0, ufb->obj->base.size,
DMA_FROM_DEVICE);
if (ret)
goto unlock;
@ -425,7 +424,6 @@ static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
if (ufb->obj->base.import_attach) {
dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
0, ufb->obj->base.size,
DMA_FROM_DEVICE);
}

6
drivers/staging/android/ion/ion.c
View File

@ -1057,8 +1057,7 @@ static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
{
}
static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
size_t len,
static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
enum dma_data_direction direction)
{
struct ion_buffer *buffer = dmabuf->priv;
@ -1076,8 +1075,7 @@ static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
return PTR_ERR_OR_ZERO(vaddr);
}
static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
size_t len,
static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
enum dma_data_direction direction)
{
struct ion_buffer *buffer = dmabuf->priv;

4
drivers/staging/android/ion/ion_test.c
View File

@ -109,7 +109,7 @@ static int ion_handle_test_kernel(struct dma_buf *dma_buf, void __user *ptr,
if (offset > dma_buf->size || size > dma_buf->size - offset)
return -EINVAL;
ret = dma_buf_begin_cpu_access(dma_buf, offset, size, dir);
ret = dma_buf_begin_cpu_access(dma_buf, dir);
if (ret)
return ret;
@ -139,7 +139,7 @@ static int ion_handle_test_kernel(struct dma_buf *dma_buf, void __user *ptr,
copy_offset = 0;
}
err:
dma_buf_end_cpu_access(dma_buf, offset, size, dir);
dma_buf_end_cpu_access(dma_buf, dir);
return ret;
}

12
include/linux/dma-buf.h
View File

@ -54,7 +54,7 @@ struct dma_buf_attachment;
* @release: release this buffer; to be called after the last dma_buf_put.
* @begin_cpu_access: [optional] called before cpu access to invalidate cpu
* caches and allocate backing storage (if not yet done)
* respectively pin the objet into memory.
* respectively pin the object into memory.
* @end_cpu_access: [optional] called after cpu access to flush caches.
* @kmap_atomic: maps a page from the buffer into kernel address
* space, users may not block until the subsequent unmap call.
@ -93,10 +93,8 @@ struct dma_buf_ops {
/* after final dma_buf_put() */
void (*release)(struct dma_buf *);
int (*begin_cpu_access)(struct dma_buf *, size_t, size_t,
enum dma_data_direction);
void (*end_cpu_access)(struct dma_buf *, size_t, size_t,
enum dma_data_direction);
int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
void (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
void *(*kmap_atomic)(struct dma_buf *, unsigned long);
void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
void *(*kmap)(struct dma_buf *, unsigned long);
@ -224,9 +222,9 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *,
enum dma_data_direction);
void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
enum dma_data_direction);
int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
int dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
enum dma_data_direction dir);
void dma_buf_end_cpu_access(struct dma_buf *dma_buf, size_t start, size_t len,
void dma_buf_end_cpu_access(struct dma_buf *dma_buf,
enum dma_data_direction dir);
void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long);
void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *);