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dma-buf: add DMA_BUF_SET_NAME ioctls

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This patch adds complimentary DMA_BUF_SET_NAME  ioctls, which lets
userspace processes attach a free-form name to each buffer.

This information can be extremely helpful for tracking and accounting
shared buffers.  For example, on Android, we know what each buffer will
be used for at allocation time: GL, multimedia, camera, etc.  The
userspace allocator can use DMA_BUF_SET_NAME to associate that
information with the buffer, so we can later give developers a
breakdown of how much memory they're allocating for graphics, camera,
etc.

Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Chenbo Feng <fengc@google.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613223408.139221-3-fengc@google.com
This commit is contained in:
Greg Hackmann
2019-06-13 15:34:07 -07:00
committed by Sumit Semwal
parent ed63bb1d1f
commit bb2bb90304
3 changed files with 69 additions and 4 deletions
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5
include/linux/dma-buf.h
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@@ -280,10 +280,12 @@ struct dma_buf_ops {
* @file: file pointer used for sharing buffers across, and for refcounting.
* @attachments: list of dma_buf_attachment that denotes all devices attached.
* @ops: dma_buf_ops associated with this buffer object.
* @lock: used internally to serialize list manipulation, attach/detach and vmap/unmap
* @lock: used internally to serialize list manipulation, attach/detach and
* vmap/unmap, and accesses to name
* @vmapping_counter: used internally to refcnt the vmaps
* @vmap_ptr: the current vmap ptr if vmapping_counter > 0
* @exp_name: name of the exporter; useful for debugging.
* @name: userspace-provided name; useful for accounting and debugging.
* @owner: pointer to exporter module; used for refcounting when exporter is a
* kernel module.
* @list_node: node for dma_buf accounting and debugging.
@@ -311,6 +313,7 @@ struct dma_buf {
unsigned vmapping_counter;
void *vmap_ptr;
const char *exp_name;
const char *name;
struct module *owner;
struct list_head list_node;
void *priv;