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ANDROID: dma-buf: add dma_buf_get_each function

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Add and export dma_buf_get_each function which helps in
traversing the db_list, this will be used by the minidump
module to get dmabuf info.

Bug: 267250898
Change-Id: Ie24788fcf9cf0a49316cb871dcb9191e8084ccde
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
(cherry picked from commit 602e4e28d89ca9c8295a904b16f4f3caeda80b7e)
[Yunfei: Change namespace get_each_dmabuf to dma_buf_get_each]
Signed-off-by: Yunfei Wang <yf.wang@mediatek.com>
Signed-off-by: Jaskaran Singh <quic_jasksing@quicinc.com>
This commit is contained in:
Vijayanand Jitta 2021-02-25 17:23:25 +05:30 committed by Suren Baghdasaryan
parent 0522dbb348
commit 358f859c30
2 changed files with 35 additions and 0 deletions
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33
drivers/dma-buf/dma-buf.c
View File

@ -43,6 +43,39 @@ struct dma_buf_list {
static struct dma_buf_list db_list;
/**
* dma_buf_get_each - Helps in traversing the db_list and calls the
* callback function which can extract required info out of each
* dmabuf.
* The db_list needs to be locked to prevent the db_list from being
* dynamically updated during the traversal process.
*
* @callback: [in] Handle for each dmabuf buffer in db_list.
* @private: [in] User-defined, used to pass in when callback is
* called.
*
* Returns 0 on success, otherwise returns a non-zero value for
* mutex_lock_interruptible or callback.
*/
int dma_buf_get_each(int (*callback)(const struct dma_buf *dmabuf,
void *private), void *private)
{
struct dma_buf *buf;
int ret = mutex_lock_interruptible(&db_list.lock);
if (ret)
return ret;
list_for_each_entry(buf, &db_list.head, list_node) {
ret = callback(buf, private);
if (ret)
break;
}
mutex_unlock(&db_list.lock);
return ret;
}
EXPORT_SYMBOL_NS_GPL(dma_buf_get_each, MINIDUMP);
static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
{
struct dma_buf *dmabuf;

2
include/linux/dma-buf.h
View File

@ -675,6 +675,8 @@ dma_buf_attachment_is_dynamic(struct dma_buf_attachment *attach)
return !!attach->importer_ops;
}
int dma_buf_get_each(int (*callback)(const struct dma_buf *dmabuf,
void *private), void *private);
struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
struct device *dev);
struct dma_buf_attachment *