diff options
| author | Tyler Luu <tluu@ti.com> | 2012-07-30 12:18:14 +0800 |
|---|---|---|
| committer | Andy Green <andy.green@linaro.org> | 2012-07-30 12:18:14 +0800 |
| commit | 3885067c7d302f3ca8078d898124375a421afd4c (patch) | |
| tree | 5995b4207c0e9ccd66857df115f022a76e1f4da2 /include | |
| parent | b2800c46002d9ea3caaf1d64a6186edb0a62bc7c (diff) | |
rpmsg: omx: implement separate register ioctl for sgx buffers
This implements a new register ioctl specifically meant for sgx
buffers. rpmsg_omx clients are expected to call register ioctl
for the specific buffer type (ion or sgx) before sending a buffer
to .write for mapping. The registration allows the rpmsg_omx
driver to hold a reference to the ion buffers making up the sgx
buffer, thereby preventing the buffer(s) to be freed up from
under the remote processor.
The individual imported ion handles are expected to be passed
into the .write call.
When a client no longer expects remote processor to use the buffer,
client should call unregister ioctl. A separate unregister ioctl
for pvr buffers is not created, and the same ion unregister ioctl
is expected to be used for all the ion handles a sgx buffer is
comprised of.
Change-Id: I12d088851f259724e10bed642956bd263b19df1d
Signed-off-by: Tyler Luu <tluu@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/rpmsg_omx.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/rpmsg_omx.h b/include/linux/rpmsg_omx.h index 15503d5ee07d..3d5e42aca77f 100644 --- a/include/linux/rpmsg_omx.h +++ b/include/linux/rpmsg_omx.h @@ -35,13 +35,27 @@ #include <linux/ioctl.h> +/** + * struct omx_pvr_data - metadata passed to/from userspace for a pvr register + * @fd: a file descriptor representing a pvr handle + * @num_handles: field filled by driver. userspace uses this to determine + * number of handles associated with fd + * @handles: opaque pointers pointing to buffers + */ +struct omx_pvr_data { + int fd; + unsigned int num_handles; + void *handles[2]; +}; + #define OMX_IOC_MAGIC 'X' #define OMX_IOCCONNECT _IOW(OMX_IOC_MAGIC, 1, char *) #define OMX_IOCIONREGISTER _IOWR(OMX_IOC_MAGIC, 2, struct ion_fd_data) #define OMX_IOCIONUNREGISTER _IOWR(OMX_IOC_MAGIC, 3, struct ion_fd_data) +#define OMX_IOCPVRREGISTER _IOWR(OMX_IOC_MAGIC, 4, struct omx_pvr_data) -#define OMX_IOC_MAXNR (3) +#define OMX_IOC_MAXNR (4) #ifdef __KERNEL__ |