diff options
Diffstat (limited to 'patches.tizen/0355-dma-buf-add-lock-callback-for-fcntl-system-call.patch')
| -rw-r--r-- | patches.tizen/0355-dma-buf-add-lock-callback-for-fcntl-system-call.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/patches.tizen/0355-dma-buf-add-lock-callback-for-fcntl-system-call.patch b/patches.tizen/0355-dma-buf-add-lock-callback-for-fcntl-system-call.patch new file mode 100644 index 00000000000..46d07eb409b --- /dev/null +++ b/patches.tizen/0355-dma-buf-add-lock-callback-for-fcntl-system-call.patch @@ -0,0 +1,68 @@ +From 5a25eeb1650459a280ef145e753c204ebaee9863 Mon Sep 17 00:00:00 2001 +From: Inki Dae <inki.dae@samsung.com> +Date: Fri, 12 Jul 2013 14:01:02 +0900 +Subject: [PATCH 0355/1302] dma-buf: add lock callback for fcntl system call. + +This patch adds lock callback to dma buf file operations, +and this callback will be called by fcntl system call. + +With this patch, fcntl system call can be used for buffer +synchronization between CPU and CPU, and CPU and DMA in user mode. + +Signed-off-by: Inki Dae <inki.dae@samsung.com> +Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> +Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> +--- + drivers/base/dma-buf.c | 33 +++++++++++++++++++++++++++++++++ + 1 file changed, 33 insertions(+) + +diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c +index 9a26981..e1b8583 100644 +--- a/drivers/base/dma-buf.c ++++ b/drivers/base/dma-buf.c +@@ -80,9 +80,42 @@ static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma) + return dmabuf->ops->mmap(dmabuf, vma); + } + ++static int dma_buf_lock(struct file *file, int cmd, struct file_lock *fl) ++{ ++ struct dma_buf *dmabuf; ++ unsigned int type; ++ bool wait = false; ++ ++ if (!is_dma_buf_file(file)) ++ return -EINVAL; ++ ++ dmabuf = file->private_data; ++ ++ if ((fl->fl_type & F_UNLCK) == F_UNLCK) { ++ dmabuf_sync_single_unlock(dmabuf); ++ return 0; ++ } ++ ++ /* convert flock type to dmabuf sync type. */ ++ if ((fl->fl_type & F_WRLCK) == F_WRLCK) ++ type = DMA_BUF_ACCESS_W; ++ else if ((fl->fl_type & F_RDLCK) == F_RDLCK) ++ type = DMA_BUF_ACCESS_R; ++ else ++ return -EINVAL; ++ ++ if (fl->fl_flags & FL_SLEEP) ++ wait = true; ++ ++ /* TODO. the locking to certain region should also be considered. */ ++ ++ return dmabuf_sync_single_lock(dmabuf, type, wait); ++} ++ + static const struct file_operations dma_buf_fops = { + .release = dma_buf_release, + .mmap = dma_buf_mmap_internal, ++ .lock = dma_buf_lock, + }; + + /* +-- +1.8.3.2 + |