@@ -32,158 +32,12 @@
#include <trace/events/v4l2.h>
-static int debug;
-module_param(debug, int, 0644);
+#include "videobuf2-internal.h"
-#define dprintk(level, fmt, arg...) \
- do { \
- if (debug >= level) \
- pr_info("vb2: %s: " fmt, __func__, ## arg); \
- } while (0)
+int vb2_debug;
+EXPORT_SYMBOL_GPL(vb2_debug);
+module_param_named(debug, vb2_debug, int, 0644);
-#ifdef CONFIG_VIDEO_ADV_DEBUG
-
-/*
- * If advanced debugging is on, then count how often each op is called
- * successfully, which can either be per-buffer or per-queue.
- *
- * This makes it easy to check that the 'init' and 'cleanup'
- * (and variations thereof) stay balanced.
- */
-
-#define log_memop(vb, op) \
- dprintk(2, "call_memop(%p, %d, %s)%s\n", \
- (vb)->vb2_queue, (vb)->index, #op, \
- (vb)->vb2_queue->mem_ops->op ? "" : " (nop)")
-
-#define call_memop(vb, op, args...) \
-({ \
- struct vb2_queue *_q = (vb)->vb2_queue; \
- int err; \
- \
- log_memop(vb, op); \
- err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \
- if (!err) \
- (vb)->cnt_mem_ ## op++; \
- err; \
-})
-
-#define call_ptr_memop(vb, op, args...) \
-({ \
- struct vb2_queue *_q = (vb)->vb2_queue; \
- void *ptr; \
- \
- log_memop(vb, op); \
- ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \
- if (!IS_ERR_OR_NULL(ptr)) \
- (vb)->cnt_mem_ ## op++; \
- ptr; \
-})
-
-#define call_void_memop(vb, op, args...) \
-({ \
- struct vb2_queue *_q = (vb)->vb2_queue; \
- \
- log_memop(vb, op); \
- if (_q->mem_ops->op) \
- _q->mem_ops->op(args); \
- (vb)->cnt_mem_ ## op++; \
-})
-
-#define log_qop(q, op) \
- dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \
- (q)->ops->op ? "" : " (nop)")
-
-#define call_qop(q, op, args...) \
-({ \
- int err; \
- \
- log_qop(q, op); \
- err = (q)->ops->op ? (q)->ops->op(args) : 0; \
- if (!err) \
- (q)->cnt_ ## op++; \
- err; \
-})
-
-#define call_void_qop(q, op, args...) \
-({ \
- log_qop(q, op); \
- if ((q)->ops->op) \
- (q)->ops->op(args); \
- (q)->cnt_ ## op++; \
-})
-
-#define log_vb_qop(vb, op, args...) \
- dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \
- (vb)->vb2_queue, (vb)->index, #op, \
- (vb)->vb2_queue->ops->op ? "" : " (nop)")
-
-#define call_vb_qop(vb, op, args...) \
-({ \
- int err; \
- \
- log_vb_qop(vb, op); \
- err = (vb)->vb2_queue->ops->op ? \
- (vb)->vb2_queue->ops->op(args) : 0; \
- if (!err) \
- (vb)->cnt_ ## op++; \
- err; \
-})
-
-#define call_void_vb_qop(vb, op, args...) \
-({ \
- log_vb_qop(vb, op); \
- if ((vb)->vb2_queue->ops->op) \
- (vb)->vb2_queue->ops->op(args); \
- (vb)->cnt_ ## op++; \
-})
-
-#else
-
-#define call_memop(vb, op, args...) \
- ((vb)->vb2_queue->mem_ops->op ? \
- (vb)->vb2_queue->mem_ops->op(args) : 0)
-
-#define call_ptr_memop(vb, op, args...) \
- ((vb)->vb2_queue->mem_ops->op ? \
- (vb)->vb2_queue->mem_ops->op(args) : NULL)
-
-#define call_void_memop(vb, op, args...) \
- do { \
- if ((vb)->vb2_queue->mem_ops->op) \
- (vb)->vb2_queue->mem_ops->op(args); \
- } while (0)
-
-#define call_qop(q, op, args...) \
- ((q)->ops->op ? (q)->ops->op(args) : 0)
-
-#define call_void_qop(q, op, args...) \
- do { \
- if ((q)->ops->op) \
- (q)->ops->op(args); \
- } while (0)
-
-#define call_vb_qop(vb, op, args...) \
- ((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0)
-
-#define call_void_vb_qop(vb, op, args...) \
- do { \
- if ((vb)->vb2_queue->ops->op) \
- (vb)->vb2_queue->ops->op(args); \
- } while (0)
-
-#endif
-
-/* Flags that are set by the vb2 core */
-#define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \
- V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \
- V4L2_BUF_FLAG_PREPARED | \
- V4L2_BUF_FLAG_TIMESTAMP_MASK)
-/* Output buffer flags that should be passed on to the driver */
-#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
- V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
-
-static void __vb2_queue_cancel(struct vb2_queue *q);
static void __enqueue_in_driver(struct vb2_buffer *vb);
/**
@@ -435,7 +289,7 @@ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
* related information, if no buffers are left return the queue to an
* uninitialized state. Might be called even if the queue has already been freed.
*/
-static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
+int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
{
unsigned int buffer;
@@ -479,7 +333,7 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming ||
q->cnt_wait_prepare != q->cnt_wait_finish;
- if (unbalanced || debug) {
+ if (unbalanced || vb2_debug) {
pr_info("vb2: counters for queue %p:%s\n", q,
unbalanced ? " UNBALANCED!" : "");
pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n",
@@ -505,7 +359,7 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
vb->cnt_buf_prepare != vb->cnt_buf_finish ||
vb->cnt_buf_init != vb->cnt_buf_cleanup;
- if (unbalanced || debug) {
+ if (unbalanced || vb2_debug) {
pr_info("vb2: counters for queue %p, buffer %d:%s\n",
q, buffer, unbalanced ? " UNBALANCED!" : "");
pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n",
@@ -550,7 +404,7 @@ static int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
* __verify_planes_array() - verify that the planes array passed in struct
* v4l2_buffer from userspace can be safely used
*/
-static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b)
+int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b)
{
if (!V4L2_TYPE_IS_MULTIPLANAR(b->type))
return 0;
@@ -572,50 +426,10 @@ static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer
}
/**
- * __verify_length() - Verify that the bytesused value for each plane fits in
- * the plane length and that the data offset doesn't exceed the bytesused value.
- */
-static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
-{
- unsigned int length;
- unsigned int bytesused;
- unsigned int plane;
-
- if (!V4L2_TYPE_IS_OUTPUT(b->type))
- return 0;
-
- if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
- for (plane = 0; plane < vb->num_planes; ++plane) {
- length = (b->memory == VB2_MEMORY_USERPTR ||
- b->memory == VB2_MEMORY_DMABUF)
- ? b->m.planes[plane].length
- : vb->planes[plane].length;
- bytesused = b->m.planes[plane].bytesused
- ? b->m.planes[plane].bytesused : length;
-
- if (b->m.planes[plane].bytesused > length)
- return -EINVAL;
-
- if (b->m.planes[plane].data_offset > 0 &&
- b->m.planes[plane].data_offset >= bytesused)
- return -EINVAL;
- }
- } else {
- length = (b->memory == VB2_MEMORY_USERPTR)
- ? b->length : vb->planes[0].length;
-
- if (b->bytesused > length)
- return -EINVAL;
- }
-
- return 0;
-}
-
-/**
* __buffer_in_use() - return true if the buffer is in use and
* the queue cannot be freed (by the means of REQBUFS(0)) call
*/
-static bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb)
+bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb)
{
unsigned int plane;
for (plane = 0; plane < vb->num_planes; ++plane) {
@@ -647,140 +461,6 @@ static bool __buffers_in_use(struct vb2_queue *q)
}
/**
- * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be
- * returned to userspace
- */
-static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)
-{
- struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
- struct vb2_queue *q = vb->vb2_queue;
- unsigned int plane;
-
- /* Copy back data such as timestamp, flags, etc. */
- b->index = vb->index;
- b->type = vb->type;
- b->memory = vb->memory;
- b->bytesused = 0;
-
- b->flags = vbuf->flags;
- b->field = vbuf->field;
- b->timestamp = vbuf->timestamp;
- b->timecode = vbuf->timecode;
- b->sequence = vbuf->sequence;
- b->reserved2 = 0;
- b->reserved = 0;
-
- if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) {
- /*
- * Fill in plane-related data if userspace provided an array
- * for it. The caller has already verified memory and size.
- */
- b->length = vb->num_planes;
- for (plane = 0; plane < vb->num_planes; ++plane) {
- struct v4l2_plane *pdst = &b->m.planes[plane];
- struct vb2_plane *psrc = &vb->planes[plane];
-
- pdst->bytesused = psrc->bytesused;
- pdst->length = psrc->length;
- if (q->memory == VB2_MEMORY_MMAP)
- pdst->m.mem_offset = psrc->m.offset;
- else if (q->memory == VB2_MEMORY_USERPTR)
- pdst->m.userptr = psrc->m.userptr;
- else if (q->memory == VB2_MEMORY_DMABUF)
- pdst->m.fd = psrc->m.fd;
- pdst->data_offset = psrc->data_offset;
- memset(pdst->reserved, 0, sizeof(pdst->reserved));
- }
- } else {
- /*
- * We use length and offset in v4l2_planes array even for
- * single-planar buffers, but userspace does not.
- */
- b->length = vb->planes[0].length;
- b->bytesused = vb->planes[0].bytesused;
- if (q->memory == VB2_MEMORY_MMAP)
- b->m.offset = vb->planes[0].m.offset;
- else if (q->memory == VB2_MEMORY_USERPTR)
- b->m.userptr = vb->planes[0].m.userptr;
- else if (q->memory == VB2_MEMORY_DMABUF)
- b->m.fd = vb->planes[0].m.fd;
- }
-
- /*
- * Clear any buffer state related flags.
- */
- b->flags &= ~V4L2_BUFFER_MASK_FLAGS;
- b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
- if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) !=
- V4L2_BUF_FLAG_TIMESTAMP_COPY) {
- /*
- * For non-COPY timestamps, drop timestamp source bits
- * and obtain the timestamp source from the queue.
- */
- b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
- b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
- }
-
- switch (vb->state) {
- case VB2_BUF_STATE_QUEUED:
- case VB2_BUF_STATE_ACTIVE:
- b->flags |= V4L2_BUF_FLAG_QUEUED;
- break;
- case VB2_BUF_STATE_ERROR:
- b->flags |= V4L2_BUF_FLAG_ERROR;
- /* fall through */
- case VB2_BUF_STATE_DONE:
- b->flags |= V4L2_BUF_FLAG_DONE;
- break;
- case VB2_BUF_STATE_PREPARED:
- b->flags |= V4L2_BUF_FLAG_PREPARED;
- break;
- case VB2_BUF_STATE_PREPARING:
- case VB2_BUF_STATE_DEQUEUED:
- /* nothing */
- break;
- }
-
- if (__buffer_in_use(q, vb))
- b->flags |= V4L2_BUF_FLAG_MAPPED;
-}
-
-/**
- * vb2_querybuf() - query video buffer information
- * @q: videobuf queue
- * @b: buffer struct passed from userspace to vidioc_querybuf handler
- * in driver
- *
- * Should be called from vidioc_querybuf ioctl handler in driver.
- * This function will verify the passed v4l2_buffer structure and fill the
- * relevant information for the userspace.
- *
- * The return values from this function are intended to be directly returned
- * from vidioc_querybuf handler in driver.
- */
-int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
-{
- struct vb2_buffer *vb;
- int ret;
-
- if (b->type != q->type) {
- dprintk(1, "wrong buffer type\n");
- return -EINVAL;
- }
-
- if (b->index >= q->num_buffers) {
- dprintk(1, "buffer index out of range\n");
- return -EINVAL;
- }
- vb = q->bufs[b->index];
- ret = __verify_planes_array(vb, b);
- if (!ret)
- __fill_v4l2_buffer(vb, b);
- return ret;
-}
-EXPORT_SYMBOL(vb2_querybuf);
-
-/**
* __verify_userptr_ops() - verify that all memory operations required for
* USERPTR queue type have been provided
*/
@@ -824,7 +504,7 @@ static int __verify_dmabuf_ops(struct vb2_queue *q)
* __verify_memory_type() - Check whether the memory type and buffer type
* passed to a buffer operation are compatible with the queue.
*/
-static int __verify_memory_type(struct vb2_queue *q,
+int __verify_memory_type(struct vb2_queue *q,
enum vb2_memory memory, unsigned int type)
{
if (memory != VB2_MEMORY_MMAP && memory != VB2_MEMORY_USERPTR &&
@@ -892,7 +572,7 @@ static int __verify_memory_type(struct vb2_queue *q,
* The return values from this function are intended to be directly returned
* from vidioc_reqbufs handler in driver.
*/
-static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
+int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
{
unsigned int num_buffers, allocated_buffers, num_planes = 0;
int ret;
@@ -1008,20 +688,6 @@ static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
}
/**
- * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and
- * type values.
- * @q: videobuf2 queue
- * @req: struct passed from userspace to vidioc_reqbufs handler in driver
- */
-int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
-{
- int ret = __verify_memory_type(q, req->memory, req->type);
-
- return ret ? ret : __reqbufs(q, req);
-}
-EXPORT_SYMBOL_GPL(vb2_reqbufs);
-
-/**
* __create_bufs() - Allocate buffers and any required auxiliary structs
* @q: videobuf2 queue
* @create: creation parameters, passed from userspace to vidioc_create_bufs
@@ -1036,7 +702,7 @@ EXPORT_SYMBOL_GPL(vb2_reqbufs);
* The return values from this function are intended to be directly returned
* from vidioc_create_bufs handler in driver.
*/
-static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
+int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
{
unsigned int num_planes = 0, num_buffers, allocated_buffers;
int ret;
@@ -1118,24 +784,6 @@ static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create
}
/**
- * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the
- * memory and type values.
- * @q: videobuf2 queue
- * @create: creation parameters, passed from userspace to vidioc_create_bufs
- * handler in driver
- */
-int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
-{
- int ret = __verify_memory_type(q, create->memory, create->format.type);
-
- create->index = q->num_buffers;
- if (create->count == 0)
- return ret != -EBUSY ? ret : 0;
- return ret ? ret : __create_bufs(q, create);
-}
-EXPORT_SYMBOL_GPL(vb2_create_bufs);
-
-/**
* vb2_plane_vaddr() - Return a kernel virtual address of a given plane
* @vb: vb2_buffer to which the plane in question belongs to
* @plane_no: plane number for which the address is to be returned
@@ -1266,151 +914,6 @@ void vb2_discard_done(struct vb2_queue *q)
}
EXPORT_SYMBOL_GPL(vb2_discard_done);
-static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
-{
- static bool __check_once __read_mostly;
-
- if (__check_once)
- return;
-
- __check_once = true;
- __WARN();
-
- pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n");
- if (vb->vb2_queue->allow_zero_bytesused)
- pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
- else
- pr_warn_once("use the actual size instead.\n");
-}
-
-/**
- * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a
- * v4l2_buffer by the userspace. The caller has already verified that struct
- * v4l2_buffer has a valid number of planes.
- */
-static void __fill_vb2_buffer(struct vb2_buffer *vb,
- const struct v4l2_buffer *b, struct vb2_plane *planes)
-{
- struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
- unsigned int plane;
-
- if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
- if (b->memory == VB2_MEMORY_USERPTR) {
- for (plane = 0; plane < vb->num_planes; ++plane) {
- planes[plane].m.userptr =
- b->m.planes[plane].m.userptr;
- planes[plane].length =
- b->m.planes[plane].length;
- }
- }
- if (b->memory == VB2_MEMORY_DMABUF) {
- for (plane = 0; plane < vb->num_planes; ++plane) {
- planes[plane].m.fd =
- b->m.planes[plane].m.fd;
- planes[plane].length =
- b->m.planes[plane].length;
- }
- }
-
- /* Fill in driver-provided information for OUTPUT types */
- if (V4L2_TYPE_IS_OUTPUT(b->type)) {
- /*
- * Will have to go up to b->length when API starts
- * accepting variable number of planes.
- *
- * If bytesused == 0 for the output buffer, then fall
- * back to the full buffer size. In that case
- * userspace clearly never bothered to set it and
- * it's a safe assumption that they really meant to
- * use the full plane sizes.
- *
- * Some drivers, e.g. old codec drivers, use bytesused == 0
- * as a way to indicate that streaming is finished.
- * In that case, the driver should use the
- * allow_zero_bytesused flag to keep old userspace
- * applications working.
- */
- for (plane = 0; plane < vb->num_planes; ++plane) {
- struct vb2_plane *pdst = &planes[plane];
- struct v4l2_plane *psrc = &b->m.planes[plane];
-
- if (psrc->bytesused == 0)
- vb2_warn_zero_bytesused(vb);
-
- if (vb->vb2_queue->allow_zero_bytesused)
- pdst->bytesused = psrc->bytesused;
- else
- pdst->bytesused = psrc->bytesused ?
- psrc->bytesused : pdst->length;
- pdst->data_offset = psrc->data_offset;
- }
- }
- } else {
- /*
- * Single-planar buffers do not use planes array,
- * so fill in relevant v4l2_buffer struct fields instead.
- * In videobuf we use our internal V4l2_planes struct for
- * single-planar buffers as well, for simplicity.
- *
- * If bytesused == 0 for the output buffer, then fall back
- * to the full buffer size as that's a sensible default.
- *
- * Some drivers, e.g. old codec drivers, use bytesused == 0 as
- * a way to indicate that streaming is finished. In that case,
- * the driver should use the allow_zero_bytesused flag to keep
- * old userspace applications working.
- */
- if (b->memory == VB2_MEMORY_USERPTR) {
- planes[0].m.userptr = b->m.userptr;
- planes[0].length = b->length;
- }
-
- if (b->memory == VB2_MEMORY_DMABUF) {
- planes[0].m.fd = b->m.fd;
- planes[0].length = b->length;
- }
-
- if (V4L2_TYPE_IS_OUTPUT(b->type)) {
- if (b->bytesused == 0)
- vb2_warn_zero_bytesused(vb);
-
- if (vb->vb2_queue->allow_zero_bytesused)
- planes[0].bytesused = b->bytesused;
- else
- planes[0].bytesused = b->bytesused ?
- b->bytesused : planes[0].length;
- } else
- planes[0].bytesused = 0;
-
- }
-
- /* Zero flags that the vb2 core handles */
- vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;
- if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) !=
- V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) {
- /*
- * Non-COPY timestamps and non-OUTPUT queues will get
- * their timestamp and timestamp source flags from the
- * queue.
- */
- vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
- }
-
- if (V4L2_TYPE_IS_OUTPUT(b->type)) {
- /*
- * For output buffers mask out the timecode flag:
- * this will be handled later in vb2_internal_qbuf().
- * The 'field' is valid metadata for this output buffer
- * and so that needs to be copied here.
- */
- vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
- vbuf->field = b->field;
- } else {
- /* Zero any output buffer flags as this is a capture buffer */
- vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
- }
-}
-
/**
* __qbuf_mmap() - handle qbuf of an MMAP buffer
*/
@@ -1679,7 +1182,7 @@ static void __enqueue_in_driver(struct vb2_buffer *vb)
call_void_vb_qop(vb, buf_queue, vb);
}
-static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b)
+int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
struct vb2_queue *q = vb->vb2_queue;
@@ -1738,7 +1241,7 @@ static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b)
return ret;
}
-static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
+int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
const char *opname)
{
if (b->type != q->type) {
@@ -1766,53 +1269,6 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
}
/**
- * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel
- * @q: videobuf2 queue
- * @b: buffer structure passed from userspace to vidioc_prepare_buf
- * handler in driver
- *
- * Should be called from vidioc_prepare_buf ioctl handler of a driver.
- * This function:
- * 1) verifies the passed buffer,
- * 2) calls buf_prepare callback in the driver (if provided), in which
- * driver-specific buffer initialization can be performed,
- *
- * The return values from this function are intended to be directly returned
- * from vidioc_prepare_buf handler in driver.
- */
-int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
-{
- struct vb2_buffer *vb;
- int ret;
-
- if (vb2_fileio_is_active(q)) {
- dprintk(1, "file io in progress\n");
- return -EBUSY;
- }
-
- ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf");
- if (ret)
- return ret;
-
- vb = q->bufs[b->index];
- if (vb->state != VB2_BUF_STATE_DEQUEUED) {
- dprintk(1, "invalid buffer state %d\n",
- vb->state);
- return -EINVAL;
- }
-
- ret = __buf_prepare(vb, b);
- if (!ret) {
- /* Fill buffer information for the userspace */
- __fill_v4l2_buffer(vb, b);
-
- dprintk(1, "prepare of buffer %d succeeded\n", vb->index);
- }
- return ret;
-}
-EXPORT_SYMBOL_GPL(vb2_prepare_buf);
-
-/**
* vb2_start_streaming() - Attempt to start streaming.
* @q: videobuf2 queue
*
@@ -1875,7 +1331,7 @@ static int vb2_start_streaming(struct vb2_queue *q)
return ret;
}
-static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
+int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
{
int ret = vb2_queue_or_prepare_buf(q, b, "qbuf");
struct vb2_buffer *vb;
@@ -1954,34 +1410,6 @@ static int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
}
/**
- * vb2_qbuf() - Queue a buffer from userspace
- * @q: videobuf2 queue
- * @b: buffer structure passed from userspace to vidioc_qbuf handler
- * in driver
- *
- * Should be called from vidioc_qbuf ioctl handler of a driver.
- * This function:
- * 1) verifies the passed buffer,
- * 2) if necessary, calls buf_prepare callback in the driver (if provided), in
- * which driver-specific buffer initialization can be performed,
- * 3) if streaming is on, queues the buffer in driver by the means of buf_queue
- * callback for processing.
- *
- * The return values from this function are intended to be directly returned
- * from vidioc_qbuf handler in driver.
- */
-int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
-{
- if (vb2_fileio_is_active(q)) {
- dprintk(1, "file io in progress\n");
- return -EBUSY;
- }
-
- return vb2_internal_qbuf(q, b);
-}
-EXPORT_SYMBOL_GPL(vb2_qbuf);
-
-/**
* __vb2_wait_for_done_vb() - wait for a buffer to become available
* for dequeuing
*
@@ -2139,7 +1567,7 @@ static void __vb2_dqbuf(struct vb2_buffer *vb)
}
}
-static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b,
+int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b,
bool nonblocking)
{
struct vb2_buffer *vb = NULL;
@@ -2190,43 +1618,12 @@ static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b,
}
/**
- * vb2_dqbuf() - Dequeue a buffer to the userspace
- * @q: videobuf2 queue
- * @b: buffer structure passed from userspace to vidioc_dqbuf handler
- * in driver
- * @nonblocking: if true, this call will not sleep waiting for a buffer if no
- * buffers ready for dequeuing are present. Normally the driver
- * would be passing (file->f_flags & O_NONBLOCK) here
- *
- * Should be called from vidioc_dqbuf ioctl handler of a driver.
- * This function:
- * 1) verifies the passed buffer,
- * 2) calls buf_finish callback in the driver (if provided), in which
- * driver can perform any additional operations that may be required before
- * returning the buffer to userspace, such as cache sync,
- * 3) the buffer struct members are filled with relevant information for
- * the userspace.
- *
- * The return values from this function are intended to be directly returned
- * from vidioc_dqbuf handler in driver.
- */
-int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
-{
- if (vb2_fileio_is_active(q)) {
- dprintk(1, "file io in progress\n");
- return -EBUSY;
- }
- return vb2_internal_dqbuf(q, b, nonblocking);
-}
-EXPORT_SYMBOL_GPL(vb2_dqbuf);
-
-/**
* __vb2_queue_cancel() - cancel and stop (pause) streaming
*
* Removes all queued buffers from driver's queue and all buffers queued by
* userspace from videobuf's queue. Returns to state after reqbufs.
*/
-static void __vb2_queue_cancel(struct vb2_queue *q)
+void __vb2_queue_cancel(struct vb2_queue *q)
{
unsigned int i;
@@ -2288,7 +1685,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
}
}
-static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
+int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
{
int ret;
@@ -2352,30 +1749,7 @@ void vb2_queue_error(struct vb2_queue *q)
}
EXPORT_SYMBOL_GPL(vb2_queue_error);
-/**
- * vb2_streamon - start streaming
- * @q: videobuf2 queue
- * @type: type argument passed from userspace to vidioc_streamon handler
- *
- * Should be called from vidioc_streamon handler of a driver.
- * This function:
- * 1) verifies current state
- * 2) passes any previously queued buffers to the driver and starts streaming
- *
- * The return values from this function are intended to be directly returned
- * from vidioc_streamon handler in the driver.
- */
-int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
-{
- if (vb2_fileio_is_active(q)) {
- dprintk(1, "file io in progress\n");
- return -EBUSY;
- }
- return vb2_internal_streamon(q, type);
-}
-EXPORT_SYMBOL_GPL(vb2_streamon);
-
-static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
+int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
{
if (type != q->type) {
dprintk(1, "invalid stream type\n");
@@ -2400,31 +1774,6 @@ static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
}
/**
- * vb2_streamoff - stop streaming
- * @q: videobuf2 queue
- * @type: type argument passed from userspace to vidioc_streamoff handler
- *
- * Should be called from vidioc_streamoff handler of a driver.
- * This function:
- * 1) verifies current state,
- * 2) stop streaming and dequeues any queued buffers, including those previously
- * passed to the driver (after waiting for the driver to finish).
- *
- * This call can be used for pausing playback.
- * The return values from this function are intended to be directly returned
- * from vidioc_streamoff handler in the driver
- */
-int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
-{
- if (vb2_fileio_is_active(q)) {
- dprintk(1, "file io in progress\n");
- return -EBUSY;
- }
- return vb2_internal_streamoff(q, type);
-}
-EXPORT_SYMBOL_GPL(vb2_streamoff);
-
-/**
* __find_plane_by_offset() - find plane associated with the given offset off
*/
static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off,
@@ -2651,978 +2000,6 @@ unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
EXPORT_SYMBOL_GPL(vb2_get_unmapped_area);
#endif
-static int __vb2_init_fileio(struct vb2_queue *q, int read);
-static int __vb2_cleanup_fileio(struct vb2_queue *q);
-
-/**
- * vb2_poll() - implements poll userspace operation
- * @q: videobuf2 queue
- * @file: file argument passed to the poll file operation handler
- * @wait: wait argument passed to the poll file operation handler
- *
- * This function implements poll file operation handler for a driver.
- * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will
- * be informed that the file descriptor of a video device is available for
- * reading.
- * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor
- * will be reported as available for writing.
- *
- * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any
- * pending events.
- *
- * The return values from this function are intended to be directly returned
- * from poll handler in driver.
- */
-unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
-{
- struct video_device *vfd = video_devdata(file);
- unsigned long req_events = poll_requested_events(wait);
- struct vb2_buffer *vb = NULL;
- unsigned int res = 0;
- unsigned long flags;
-
- if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
- struct v4l2_fh *fh = file->private_data;
-
- if (v4l2_event_pending(fh))
- res = POLLPRI;
- else if (req_events & POLLPRI)
- poll_wait(file, &fh->wait, wait);
- }
-
- if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM)))
- return res;
- if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM)))
- return res;
-
- /*
- * Start file I/O emulator only if streaming API has not been used yet.
- */
- if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) {
- if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) &&
- (req_events & (POLLIN | POLLRDNORM))) {
- if (__vb2_init_fileio(q, 1))
- return res | POLLERR;
- }
- if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) &&
- (req_events & (POLLOUT | POLLWRNORM))) {
- if (__vb2_init_fileio(q, 0))
- return res | POLLERR;
- /*
- * Write to OUTPUT queue can be done immediately.
- */
- return res | POLLOUT | POLLWRNORM;
- }
- }
-
- /*
- * There is nothing to wait for if the queue isn't streaming, or if the
- * error flag is set.
- */
- if (!vb2_is_streaming(q) || q->error)
- return res | POLLERR;
- /*
- * For compatibility with vb1: if QBUF hasn't been called yet, then
- * return POLLERR as well. This only affects capture queues, output
- * queues will always initialize waiting_for_buffers to false.
- */
- if (q->waiting_for_buffers)
- return res | POLLERR;
-
- /*
- * For output streams you can write as long as there are fewer buffers
- * queued than there are buffers available.
- */
- if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers)
- return res | POLLOUT | POLLWRNORM;
-
- if (list_empty(&q->done_list)) {
- /*
- * If the last buffer was dequeued from a capture queue,
- * return immediately. DQBUF will return -EPIPE.
- */
- if (q->last_buffer_dequeued)
- return res | POLLIN | POLLRDNORM;
-
- poll_wait(file, &q->done_wq, wait);
- }
-
- /*
- * Take first buffer available for dequeuing.
- */
- spin_lock_irqsave(&q->done_lock, flags);
- if (!list_empty(&q->done_list))
- vb = list_first_entry(&q->done_list, struct vb2_buffer,
- done_entry);
- spin_unlock_irqrestore(&q->done_lock, flags);
-
- if (vb && (vb->state == VB2_BUF_STATE_DONE
- || vb->state == VB2_BUF_STATE_ERROR)) {
- return (V4L2_TYPE_IS_OUTPUT(q->type)) ?
- res | POLLOUT | POLLWRNORM :
- res | POLLIN | POLLRDNORM;
- }
- return res;
-}
-EXPORT_SYMBOL_GPL(vb2_poll);
-
-/**
- * vb2_queue_init() - initialize a videobuf2 queue
- * @q: videobuf2 queue; this structure should be allocated in driver
- *
- * The vb2_queue structure should be allocated by the driver. The driver is
- * responsible of clearing it's content and setting initial values for some
- * required entries before calling this function.
- * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer
- * to the struct vb2_queue description in include/media/videobuf2-core.h
- * for more information.
- */
-int vb2_queue_init(struct vb2_queue *q)
-{
- /*
- * Sanity check
- */
- if (WARN_ON(!q) ||
- WARN_ON(!q->ops) ||
- WARN_ON(!q->mem_ops) ||
- WARN_ON(!q->type) ||
- WARN_ON(!q->io_modes) ||
- WARN_ON(!q->ops->queue_setup) ||
- WARN_ON(!q->ops->buf_queue) ||
- WARN_ON(q->timestamp_flags &
- ~(V4L2_BUF_FLAG_TIMESTAMP_MASK |
- V4L2_BUF_FLAG_TSTAMP_SRC_MASK)))
- return -EINVAL;
-
- /* Warn that the driver should choose an appropriate timestamp type */
- WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
- V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN);
-
- INIT_LIST_HEAD(&q->queued_list);
- INIT_LIST_HEAD(&q->done_list);
- spin_lock_init(&q->done_lock);
- mutex_init(&q->mmap_lock);
- init_waitqueue_head(&q->done_wq);
-
- if (q->buf_struct_size == 0)
- q->buf_struct_size = sizeof(struct vb2_buffer);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(vb2_queue_init);
-
-/**
- * vb2_queue_release() - stop streaming, release the queue and free memory
- * @q: videobuf2 queue
- *
- * This function stops streaming and performs necessary clean ups, including
- * freeing video buffer memory. The driver is responsible for freeing
- * the vb2_queue structure itself.
- */
-void vb2_queue_release(struct vb2_queue *q)
-{
- __vb2_cleanup_fileio(q);
- __vb2_queue_cancel(q);
- mutex_lock(&q->mmap_lock);
- __vb2_queue_free(q, q->num_buffers);
- mutex_unlock(&q->mmap_lock);
-}
-EXPORT_SYMBOL_GPL(vb2_queue_release);
-
-/**
- * struct vb2_fileio_buf - buffer context used by file io emulator
- *
- * vb2 provides a compatibility layer and emulator of file io (read and
- * write) calls on top of streaming API. This structure is used for
- * tracking context related to the buffers.
- */
-struct vb2_fileio_buf {
- void *vaddr;
- unsigned int size;
- unsigned int pos;
- unsigned int queued:1;
-};
-
-/**
- * struct vb2_fileio_data - queue context used by file io emulator
- *
- * @cur_index: the index of the buffer currently being read from or
- * written to. If equal to q->num_buffers then a new buffer
- * must be dequeued.
- * @initial_index: in the read() case all buffers are queued up immediately
- * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles
- * buffers. However, in the write() case no buffers are initially
- * queued, instead whenever a buffer is full it is queued up by
- * __vb2_perform_fileio(). Only once all available buffers have
- * been queued up will __vb2_perform_fileio() start to dequeue
- * buffers. This means that initially __vb2_perform_fileio()
- * needs to know what buffer index to use when it is queuing up
- * the buffers for the first time. That initial index is stored
- * in this field. Once it is equal to q->num_buffers all
- * available buffers have been queued and __vb2_perform_fileio()
- * should start the normal dequeue/queue cycle.
- *
- * vb2 provides a compatibility layer and emulator of file io (read and
- * write) calls on top of streaming API. For proper operation it required
- * this structure to save the driver state between each call of the read
- * or write function.
- */
-struct vb2_fileio_data {
- struct v4l2_requestbuffers req;
- struct v4l2_plane p;
- struct v4l2_buffer b;
- struct vb2_fileio_buf bufs[VB2_MAX_FRAME];
- unsigned int cur_index;
- unsigned int initial_index;
- unsigned int q_count;
- unsigned int dq_count;
- unsigned read_once:1;
- unsigned write_immediately:1;
-};
-
-/**
- * __vb2_init_fileio() - initialize file io emulator
- * @q: videobuf2 queue
- * @read: mode selector (1 means read, 0 means write)
- */
-static int __vb2_init_fileio(struct vb2_queue *q, int read)
-{
- struct vb2_fileio_data *fileio;
- int i, ret;
- unsigned int count = 0;
-
- /*
- * Sanity check
- */
- if (WARN_ON((read && !(q->io_modes & VB2_READ)) ||
- (!read && !(q->io_modes & VB2_WRITE))))
- return -EINVAL;
-
- /*
- * Check if device supports mapping buffers to kernel virtual space.
- */
- if (!q->mem_ops->vaddr)
- return -EBUSY;
-
- /*
- * Check if streaming api has not been already activated.
- */
- if (q->streaming || q->num_buffers > 0)
- return -EBUSY;
-
- /*
- * Start with count 1, driver can increase it in queue_setup()
- */
- count = 1;
-
- dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n",
- (read) ? "read" : "write", count, q->fileio_read_once,
- q->fileio_write_immediately);
-
- fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL);
- if (fileio == NULL)
- return -ENOMEM;
-
- fileio->read_once = q->fileio_read_once;
- fileio->write_immediately = q->fileio_write_immediately;
-
- /*
- * Request buffers and use MMAP type to force driver
- * to allocate buffers by itself.
- */
- fileio->req.count = count;
- fileio->req.memory = VB2_MEMORY_MMAP;
- fileio->req.type = q->type;
- q->fileio = fileio;
- ret = __reqbufs(q, &fileio->req);
- if (ret)
- goto err_kfree;
-
- /*
- * Check if plane_count is correct
- * (multiplane buffers are not supported).
- */
- if (q->bufs[0]->num_planes != 1) {
- ret = -EBUSY;
- goto err_reqbufs;
- }
-
- /*
- * Get kernel address of each buffer.
- */
- for (i = 0; i < q->num_buffers; i++) {
- fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0);
- if (fileio->bufs[i].vaddr == NULL) {
- ret = -EINVAL;
- goto err_reqbufs;
- }
- fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0);
- }
-
- /*
- * Read mode requires pre queuing of all buffers.
- */
- if (read) {
- bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
-
- /*
- * Queue all buffers.
- */
- for (i = 0; i < q->num_buffers; i++) {
- struct v4l2_buffer *b = &fileio->b;
-
- memset(b, 0, sizeof(*b));
- b->type = q->type;
- if (is_multiplanar) {
- memset(&fileio->p, 0, sizeof(fileio->p));
- b->m.planes = &fileio->p;
- b->length = 1;
- }
- b->memory = q->memory;
- b->index = i;
- ret = vb2_internal_qbuf(q, b);
- if (ret)
- goto err_reqbufs;
- fileio->bufs[i].queued = 1;
- }
- /*
- * All buffers have been queued, so mark that by setting
- * initial_index to q->num_buffers
- */
- fileio->initial_index = q->num_buffers;
- fileio->cur_index = q->num_buffers;
- }
-
- /*
- * Start streaming.
- */
- ret = vb2_internal_streamon(q, q->type);
- if (ret)
- goto err_reqbufs;
-
- return ret;
-
-err_reqbufs:
- fileio->req.count = 0;
- __reqbufs(q, &fileio->req);
-
-err_kfree:
- q->fileio = NULL;
- kfree(fileio);
- return ret;
-}
-
-/**
- * __vb2_cleanup_fileio() - free resourced used by file io emulator
- * @q: videobuf2 queue
- */
-static int __vb2_cleanup_fileio(struct vb2_queue *q)
-{
- struct vb2_fileio_data *fileio = q->fileio;
-
- if (fileio) {
- vb2_internal_streamoff(q, q->type);
- q->fileio = NULL;
- fileio->req.count = 0;
- vb2_reqbufs(q, &fileio->req);
- kfree(fileio);
- dprintk(3, "file io emulator closed\n");
- }
- return 0;
-}
-
-/**
- * __vb2_perform_fileio() - perform a single file io (read or write) operation
- * @q: videobuf2 queue
- * @data: pointed to target userspace buffer
- * @count: number of bytes to read or write
- * @ppos: file handle position tracking pointer
- * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking)
- * @read: access mode selector (1 means read, 0 means write)
- */
-static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count,
- loff_t *ppos, int nonblock, int read)
-{
- struct vb2_fileio_data *fileio;
- struct vb2_fileio_buf *buf;
- bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
- /*
- * When using write() to write data to an output video node the vb2 core
- * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody
- * else is able to provide this information with the write() operation.
- */
- bool set_timestamp = !read &&
- (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
- V4L2_BUF_FLAG_TIMESTAMP_COPY;
- int ret, index;
-
- dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n",
- read ? "read" : "write", (long)*ppos, count,
- nonblock ? "non" : "");
-
- if (!data)
- return -EINVAL;
-
- /*
- * Initialize emulator on first call.
- */
- if (!vb2_fileio_is_active(q)) {
- ret = __vb2_init_fileio(q, read);
- dprintk(3, "vb2_init_fileio result: %d\n", ret);
- if (ret)
- return ret;
- }
- fileio = q->fileio;
-
- /*
- * Check if we need to dequeue the buffer.
- */
- index = fileio->cur_index;
- if (index >= q->num_buffers) {
- /*
- * Call vb2_dqbuf to get buffer back.
- */
- memset(&fileio->b, 0, sizeof(fileio->b));
- fileio->b.type = q->type;
- fileio->b.memory = q->memory;
- if (is_multiplanar) {
- memset(&fileio->p, 0, sizeof(fileio->p));
- fileio->b.m.planes = &fileio->p;
- fileio->b.length = 1;
- }
- ret = vb2_internal_dqbuf(q, &fileio->b, nonblock);
- dprintk(5, "vb2_dqbuf result: %d\n", ret);
- if (ret)
- return ret;
- fileio->dq_count += 1;
-
- fileio->cur_index = index = fileio->b.index;
- buf = &fileio->bufs[index];
-
- /*
- * Get number of bytes filled by the driver
- */
- buf->pos = 0;
- buf->queued = 0;
- buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0)
- : vb2_plane_size(q->bufs[index], 0);
- /* Compensate for data_offset on read in the multiplanar case. */
- if (is_multiplanar && read &&
- fileio->b.m.planes[0].data_offset < buf->size) {
- buf->pos = fileio->b.m.planes[0].data_offset;
- buf->size -= buf->pos;
- }
- } else {
- buf = &fileio->bufs[index];
- }
-
- /*
- * Limit count on last few bytes of the buffer.
- */
- if (buf->pos + count > buf->size) {
- count = buf->size - buf->pos;
- dprintk(5, "reducing read count: %zd\n", count);
- }
-
- /*
- * Transfer data to userspace.
- */
- dprintk(3, "copying %zd bytes - buffer %d, offset %u\n",
- count, index, buf->pos);
- if (read)
- ret = copy_to_user(data, buf->vaddr + buf->pos, count);
- else
- ret = copy_from_user(buf->vaddr + buf->pos, data, count);
- if (ret) {
- dprintk(3, "error copying data\n");
- return -EFAULT;
- }
-
- /*
- * Update counters.
- */
- buf->pos += count;
- *ppos += count;
-
- /*
- * Queue next buffer if required.
- */
- if (buf->pos == buf->size || (!read && fileio->write_immediately)) {
- /*
- * Check if this is the last buffer to read.
- */
- if (read && fileio->read_once && fileio->dq_count == 1) {
- dprintk(3, "read limit reached\n");
- return __vb2_cleanup_fileio(q);
- }
-
- /*
- * Call vb2_qbuf and give buffer to the driver.
- */
- memset(&fileio->b, 0, sizeof(fileio->b));
- fileio->b.type = q->type;
- fileio->b.memory = q->memory;
- fileio->b.index = index;
- fileio->b.bytesused = buf->pos;
- if (is_multiplanar) {
- memset(&fileio->p, 0, sizeof(fileio->p));
- fileio->p.bytesused = buf->pos;
- fileio->b.m.planes = &fileio->p;
- fileio->b.length = 1;
- }
- if (set_timestamp)
- v4l2_get_timestamp(&fileio->b.timestamp);
- ret = vb2_internal_qbuf(q, &fileio->b);
- dprintk(5, "vb2_dbuf result: %d\n", ret);
- if (ret)
- return ret;
-
- /*
- * Buffer has been queued, update the status
- */
- buf->pos = 0;
- buf->queued = 1;
- buf->size = vb2_plane_size(q->bufs[index], 0);
- fileio->q_count += 1;
- /*
- * If we are queuing up buffers for the first time, then
- * increase initial_index by one.
- */
- if (fileio->initial_index < q->num_buffers)
- fileio->initial_index++;
- /*
- * The next buffer to use is either a buffer that's going to be
- * queued for the first time (initial_index < q->num_buffers)
- * or it is equal to q->num_buffers, meaning that the next
- * time we need to dequeue a buffer since we've now queued up
- * all the 'first time' buffers.
- */
- fileio->cur_index = fileio->initial_index;
- }
-
- /*
- * Return proper number of bytes processed.
- */
- if (ret == 0)
- ret = count;
- return ret;
-}
-
-size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
- loff_t *ppos, int nonblocking)
-{
- return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1);
-}
-EXPORT_SYMBOL_GPL(vb2_read);
-
-size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
- loff_t *ppos, int nonblocking)
-{
- return __vb2_perform_fileio(q, (char __user *) data, count,
- ppos, nonblocking, 0);
-}
-EXPORT_SYMBOL_GPL(vb2_write);
-
-struct vb2_threadio_data {
- struct task_struct *thread;
- vb2_thread_fnc fnc;
- void *priv;
- bool stop;
-};
-
-static int vb2_thread(void *data)
-{
- struct vb2_queue *q = data;
- struct vb2_threadio_data *threadio = q->threadio;
- struct vb2_fileio_data *fileio = q->fileio;
- bool set_timestamp = false;
- int prequeue = 0;
- int index = 0;
- int ret = 0;
-
- if (V4L2_TYPE_IS_OUTPUT(q->type)) {
- prequeue = q->num_buffers;
- set_timestamp =
- (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
- V4L2_BUF_FLAG_TIMESTAMP_COPY;
- }
-
- set_freezable();
-
- for (;;) {
- struct vb2_buffer *vb;
-
- /*
- * Call vb2_dqbuf to get buffer back.
- */
- memset(&fileio->b, 0, sizeof(fileio->b));
- fileio->b.type = q->type;
- fileio->b.memory = q->memory;
- if (prequeue) {
- fileio->b.index = index++;
- prequeue--;
- } else {
- call_void_qop(q, wait_finish, q);
- if (!threadio->stop)
- ret = vb2_internal_dqbuf(q, &fileio->b, 0);
- call_void_qop(q, wait_prepare, q);
- dprintk(5, "file io: vb2_dqbuf result: %d\n", ret);
- }
- if (ret || threadio->stop)
- break;
- try_to_freeze();
-
- vb = q->bufs[fileio->b.index];
- if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR))
- if (threadio->fnc(vb, threadio->priv))
- break;
- call_void_qop(q, wait_finish, q);
- if (set_timestamp)
- v4l2_get_timestamp(&fileio->b.timestamp);
- if (!threadio->stop)
- ret = vb2_internal_qbuf(q, &fileio->b);
- call_void_qop(q, wait_prepare, q);
- if (ret || threadio->stop)
- break;
- }
-
- /* Hmm, linux becomes *very* unhappy without this ... */
- while (!kthread_should_stop()) {
- set_current_state(TASK_INTERRUPTIBLE);
- schedule();
- }
- return 0;
-}
-
-/*
- * This function should not be used for anything else but the videobuf2-dvb
- * support. If you think you have another good use-case for this, then please
- * contact the linux-media mailinglist first.
- */
-int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
- const char *thread_name)
-{
- struct vb2_threadio_data *threadio;
- int ret = 0;
-
- if (q->threadio)
- return -EBUSY;
- if (vb2_is_busy(q))
- return -EBUSY;
- if (WARN_ON(q->fileio))
- return -EBUSY;
-
- threadio = kzalloc(sizeof(*threadio), GFP_KERNEL);
- if (threadio == NULL)
- return -ENOMEM;
- threadio->fnc = fnc;
- threadio->priv = priv;
-
- ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type));
- dprintk(3, "file io: vb2_init_fileio result: %d\n", ret);
- if (ret)
- goto nomem;
- q->threadio = threadio;
- threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name);
- if (IS_ERR(threadio->thread)) {
- ret = PTR_ERR(threadio->thread);
- threadio->thread = NULL;
- goto nothread;
- }
- return 0;
-
-nothread:
- __vb2_cleanup_fileio(q);
-nomem:
- kfree(threadio);
- return ret;
-}
-EXPORT_SYMBOL_GPL(vb2_thread_start);
-
-int vb2_thread_stop(struct vb2_queue *q)
-{
- struct vb2_threadio_data *threadio = q->threadio;
- int err;
-
- if (threadio == NULL)
- return 0;
- threadio->stop = true;
- /* Wake up all pending sleeps in the thread */
- vb2_queue_error(q);
- err = kthread_stop(threadio->thread);
- __vb2_cleanup_fileio(q);
- threadio->thread = NULL;
- kfree(threadio);
- q->threadio = NULL;
- return err;
-}
-EXPORT_SYMBOL_GPL(vb2_thread_stop);
-
-/*
- * The following functions are not part of the vb2 core API, but are helper
- * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations
- * and struct vb2_ops.
- * They contain boilerplate code that most if not all drivers have to do
- * and so they simplify the driver code.
- */
-
-/* The queue is busy if there is a owner and you are not that owner. */
-static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file)
-{
- return vdev->queue->owner && vdev->queue->owner != file->private_data;
-}
-
-/* vb2 ioctl helpers */
-
-int vb2_ioctl_reqbufs(struct file *file, void *priv,
- struct v4l2_requestbuffers *p)
-{
- struct video_device *vdev = video_devdata(file);
- int res = __verify_memory_type(vdev->queue, p->memory, p->type);
-
- if (res)
- return res;
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- res = __reqbufs(vdev->queue, p);
- /* If count == 0, then the owner has released all buffers and he
- is no longer owner of the queue. Otherwise we have a new owner. */
- if (res == 0)
- vdev->queue->owner = p->count ? file->private_data : NULL;
- return res;
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs);
-
-int vb2_ioctl_create_bufs(struct file *file, void *priv,
- struct v4l2_create_buffers *p)
-{
- struct video_device *vdev = video_devdata(file);
- int res = __verify_memory_type(vdev->queue, p->memory, p->format.type);
-
- p->index = vdev->queue->num_buffers;
- /* If count == 0, then just check if memory and type are valid.
- Any -EBUSY result from __verify_memory_type can be mapped to 0. */
- if (p->count == 0)
- return res != -EBUSY ? res : 0;
- if (res)
- return res;
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- res = __create_bufs(vdev->queue, p);
- if (res == 0)
- vdev->queue->owner = file->private_data;
- return res;
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs);
-
-int vb2_ioctl_prepare_buf(struct file *file, void *priv,
- struct v4l2_buffer *p)
-{
- struct video_device *vdev = video_devdata(file);
-
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- return vb2_prepare_buf(vdev->queue, p);
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);
-
-int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
-{
- struct video_device *vdev = video_devdata(file);
-
- /* No need to call vb2_queue_is_busy(), anyone can query buffers. */
- return vb2_querybuf(vdev->queue, p);
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf);
-
-int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
-{
- struct video_device *vdev = video_devdata(file);
-
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- return vb2_qbuf(vdev->queue, p);
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);
-
-int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
-{
- struct video_device *vdev = video_devdata(file);
-
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK);
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf);
-
-int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
-{
- struct video_device *vdev = video_devdata(file);
-
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- return vb2_streamon(vdev->queue, i);
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_streamon);
-
-int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
-{
- struct video_device *vdev = video_devdata(file);
-
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- return vb2_streamoff(vdev->queue, i);
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff);
-
-int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p)
-{
- struct video_device *vdev = video_devdata(file);
-
- if (vb2_queue_is_busy(vdev, file))
- return -EBUSY;
- return vb2_expbuf(vdev->queue, p);
-}
-EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);
-
-/* v4l2_file_operations helpers */
-
-int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma)
-{
- struct video_device *vdev = video_devdata(file);
-
- return vb2_mmap(vdev->queue, vma);
-}
-EXPORT_SYMBOL_GPL(vb2_fop_mmap);
-
-int _vb2_fop_release(struct file *file, struct mutex *lock)
-{
- struct video_device *vdev = video_devdata(file);
-
- if (lock)
- mutex_lock(lock);
- if (file->private_data == vdev->queue->owner) {
- vb2_queue_release(vdev->queue);
- vdev->queue->owner = NULL;
- }
- if (lock)
- mutex_unlock(lock);
- return v4l2_fh_release(file);
-}
-EXPORT_SYMBOL_GPL(_vb2_fop_release);
-
-int vb2_fop_release(struct file *file)
-{
- struct video_device *vdev = video_devdata(file);
- struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
-
- return _vb2_fop_release(file, lock);
-}
-EXPORT_SYMBOL_GPL(vb2_fop_release);
-
-ssize_t vb2_fop_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct video_device *vdev = video_devdata(file);
- struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
- int err = -EBUSY;
-
- if (!(vdev->queue->io_modes & VB2_WRITE))
- return -EINVAL;
- if (lock && mutex_lock_interruptible(lock))
- return -ERESTARTSYS;
- if (vb2_queue_is_busy(vdev, file))
- goto exit;
- err = vb2_write(vdev->queue, buf, count, ppos,
- file->f_flags & O_NONBLOCK);
- if (vdev->queue->fileio)
- vdev->queue->owner = file->private_data;
-exit:
- if (lock)
- mutex_unlock(lock);
- return err;
-}
-EXPORT_SYMBOL_GPL(vb2_fop_write);
-
-ssize_t vb2_fop_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct video_device *vdev = video_devdata(file);
- struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
- int err = -EBUSY;
-
- if (!(vdev->queue->io_modes & VB2_READ))
- return -EINVAL;
- if (lock && mutex_lock_interruptible(lock))
- return -ERESTARTSYS;
- if (vb2_queue_is_busy(vdev, file))
- goto exit;
- err = vb2_read(vdev->queue, buf, count, ppos,
- file->f_flags & O_NONBLOCK);
- if (vdev->queue->fileio)
- vdev->queue->owner = file->private_data;
-exit:
- if (lock)
- mutex_unlock(lock);
- return err;
-}
-EXPORT_SYMBOL_GPL(vb2_fop_read);
-
-unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
-{
- struct video_device *vdev = video_devdata(file);
- struct vb2_queue *q = vdev->queue;
- struct mutex *lock = q->lock ? q->lock : vdev->lock;
- unsigned res;
- void *fileio;
-
- /*
- * If this helper doesn't know how to lock, then you shouldn't be using
- * it but you should write your own.
- */
- WARN_ON(!lock);
-
- if (lock && mutex_lock_interruptible(lock))
- return POLLERR;
-
- fileio = q->fileio;
-
- res = vb2_poll(vdev->queue, file, wait);
-
- /* If fileio was started, then we have a new queue owner. */
- if (!fileio && q->fileio)
- q->owner = file->private_data;
- if (lock)
- mutex_unlock(lock);
- return res;
-}
-EXPORT_SYMBOL_GPL(vb2_fop_poll);
-
-#ifndef CONFIG_MMU
-unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags)
-{
- struct video_device *vdev = video_devdata(file);
-
- return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags);
-}
-EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area);
-#endif
-
-/* vb2_ops helpers. Only use if vq->lock is non-NULL. */
-
-void vb2_ops_wait_prepare(struct vb2_queue *vq)
-{
- mutex_unlock(vq->lock);
-}
-EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare);
-
-void vb2_ops_wait_finish(struct vb2_queue *vq)
-{
- mutex_lock(vq->lock);
-}
-EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);
-
MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");
MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,173 @@
+#ifndef _MEDIA_VIDEOBUF2_INTERNAL_H
+#define _MEDIA_VIDEOBUF2_INTERNAL_H
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <media/videobuf2-core.h>
+
+extern int vb2_debug;
+
+#define dprintk(level, fmt, arg...) \
+ do { \
+ if (vb2_debug >= level) \
+ pr_info("vb2: %s: " fmt, __func__, ## arg); \
+ } while (0)
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+
+/*
+ * If advanced debugging is on, then count how often each op is called
+ * successfully, which can either be per-buffer or per-queue.
+ *
+ * This makes it easy to check that the 'init' and 'cleanup'
+ * (and variations thereof) stay balanced.
+ */
+
+#define log_memop(vb, op) \
+ dprintk(2, "call_memop(%p, %d, %s)%s\n", \
+ (vb)->vb2_queue, (vb)->index, #op, \
+ (vb)->vb2_queue->mem_ops->op ? "" : " (nop)")
+
+#define call_memop(vb, op, args...) \
+({ \
+ struct vb2_queue *_q = (vb)->vb2_queue; \
+ int err; \
+ \
+ log_memop(vb, op); \
+ err = _q->mem_ops->op ? _q->mem_ops->op(args) : 0; \
+ if (!err) \
+ (vb)->cnt_mem_ ## op++; \
+ err; \
+})
+
+#define call_ptr_memop(vb, op, args...) \
+({ \
+ struct vb2_queue *_q = (vb)->vb2_queue; \
+ void *ptr; \
+ \
+ log_memop(vb, op); \
+ ptr = _q->mem_ops->op ? _q->mem_ops->op(args) : NULL; \
+ if (!IS_ERR_OR_NULL(ptr)) \
+ (vb)->cnt_mem_ ## op++; \
+ ptr; \
+})
+
+#define call_void_memop(vb, op, args...) \
+({ \
+ struct vb2_queue *_q = (vb)->vb2_queue; \
+ \
+ log_memop(vb, op); \
+ if (_q->mem_ops->op) \
+ _q->mem_ops->op(args); \
+ (vb)->cnt_mem_ ## op++; \
+})
+
+#define log_qop(q, op) \
+ dprintk(2, "call_qop(%p, %s)%s\n", q, #op, \
+ (q)->ops->op ? "" : " (nop)")
+
+#define call_qop(q, op, args...) \
+({ \
+ int err; \
+ \
+ log_qop(q, op); \
+ err = (q)->ops->op ? (q)->ops->op(args) : 0; \
+ if (!err) \
+ (q)->cnt_ ## op++; \
+ err; \
+})
+
+#define call_void_qop(q, op, args...) \
+({ \
+ log_qop(q, op); \
+ if ((q)->ops->op) \
+ (q)->ops->op(args); \
+ (q)->cnt_ ## op++; \
+})
+
+#define log_vb_qop(vb, op, args...) \
+ dprintk(2, "call_vb_qop(%p, %d, %s)%s\n", \
+ (vb)->vb2_queue, (vb)->index, #op, \
+ (vb)->vb2_queue->ops->op ? "" : " (nop)")
+
+#define call_vb_qop(vb, op, args...) \
+({ \
+ int err; \
+ \
+ log_vb_qop(vb, op); \
+ err = (vb)->vb2_queue->ops->op ? \
+ (vb)->vb2_queue->ops->op(args) : 0; \
+ if (!err) \
+ (vb)->cnt_ ## op++; \
+ err; \
+})
+
+#define call_void_vb_qop(vb, op, args...) \
+({ \
+ log_vb_qop(vb, op); \
+ if ((vb)->vb2_queue->ops->op) \
+ (vb)->vb2_queue->ops->op(args); \
+ (vb)->cnt_ ## op++; \
+})
+
+#else
+
+#define call_memop(vb, op, args...) \
+ ((vb)->vb2_queue->mem_ops->op ? \
+ (vb)->vb2_queue->mem_ops->op(args) : 0)
+
+#define call_ptr_memop(vb, op, args...) \
+ ((vb)->vb2_queue->mem_ops->op ? \
+ (vb)->vb2_queue->mem_ops->op(args) : NULL)
+
+#define call_void_memop(vb, op, args...) \
+ do { \
+ if ((vb)->vb2_queue->mem_ops->op) \
+ (vb)->vb2_queue->mem_ops->op(args); \
+ } while (0)
+
+#define call_qop(q, op, args...) \
+ ((q)->ops->op ? (q)->ops->op(args) : 0)
+
+#define call_void_qop(q, op, args...) \
+ do { \
+ if ((q)->ops->op) \
+ (q)->ops->op(args); \
+ } while (0)
+
+#define call_vb_qop(vb, op, args...) \
+ ((vb)->vb2_queue->ops->op ? (vb)->vb2_queue->ops->op(args) : 0)
+
+#define call_void_vb_qop(vb, op, args...) \
+ do { \
+ if ((vb)->vb2_queue->ops->op) \
+ (vb)->vb2_queue->ops->op(args); \
+ } while (0)
+
+#endif
+
+bool __buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb);
+int __verify_memory_type(struct vb2_queue *q,
+ enum vb2_memory memory, unsigned int type);
+int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
+int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
+int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b);
+int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b);
+int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b);
+void __vb2_queue_cancel(struct vb2_queue *q);
+int __vb2_queue_free(struct vb2_queue *q, unsigned int buffers);
+void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b);
+void __fill_vb2_buffer(struct vb2_buffer *vb,
+ const struct v4l2_buffer *b, struct vb2_plane *planes);
+int __vb2_cleanup_fileio(struct vb2_queue *q);
+
+int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
+ const char *opname);
+int vb2_internal_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
+int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b,
+ bool nonblocking);
+int vb2_internal_streamon(struct vb2_queue *q, unsigned int type);
+int vb2_internal_streamoff(struct vb2_queue *q, unsigned int type);
+
+#endif /* _MEDIA_VIDEOBUF2_INTERNAL_H */
@@ -24,8 +24,1497 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-common.h>
#include <media/videobuf2-v4l2.h>
+#include "videobuf2-internal.h"
+
+/* Flags that are set by the vb2 core */
+#define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \
+ V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \
+ V4L2_BUF_FLAG_PREPARED | \
+ V4L2_BUF_FLAG_TIMESTAMP_MASK)
+/* Output buffer flags that should be passed on to the driver */
+#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
+ V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
+
+/**
+ * __verify_length() - Verify that the bytesused value for each plane fits in
+ * the plane length and that the data offset doesn't exceed the bytesused value.
+ */
+int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
+{
+ unsigned int length;
+ unsigned int bytesused;
+ unsigned int plane;
+
+ if (!V4L2_TYPE_IS_OUTPUT(b->type))
+ return 0;
+
+ if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ length = (b->memory == VB2_MEMORY_USERPTR ||
+ b->memory == VB2_MEMORY_DMABUF)
+ ? b->m.planes[plane].length
+ : vb->planes[plane].length;
+ bytesused = b->m.planes[plane].bytesused
+ ? b->m.planes[plane].bytesused : length;
+
+ if (b->m.planes[plane].bytesused > length)
+ return -EINVAL;
+
+ if (b->m.planes[plane].data_offset > 0 &&
+ b->m.planes[plane].data_offset >= bytesused)
+ return -EINVAL;
+ }
+ } else {
+ length = (b->memory == VB2_MEMORY_USERPTR)
+ ? b->length : vb->planes[0].length;
+
+ if (b->bytesused > length)
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
+{
+ static bool __check_once __read_mostly;
+
+ if (__check_once)
+ return;
+
+ __check_once = true;
+ __WARN();
+
+ pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n");
+ if (vb->vb2_queue->allow_zero_bytesused)
+ pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
+ else
+ pr_warn_once("use the actual size instead.\n");
+}
+
+/**
+ * __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be
+ * returned to userspace
+ */
+void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct vb2_queue *q = vb->vb2_queue;
+ unsigned int plane;
+
+ /* Copy back data such as timestamp, flags, etc. */
+ b->index = vb->index;
+ b->type = vb->type;
+ b->memory = vb->memory;
+ b->bytesused = 0;
+
+ b->flags = vbuf->flags;
+ b->field = vbuf->field;
+ b->timestamp = vbuf->timestamp;
+ b->timecode = vbuf->timecode;
+ b->sequence = vbuf->sequence;
+ b->reserved2 = 0;
+ b->reserved = 0;
+
+ if (V4L2_TYPE_IS_MULTIPLANAR(q->type)) {
+ /*
+ * Fill in plane-related data if userspace provided an array
+ * for it. The caller has already verified memory and size.
+ */
+ b->length = vb->num_planes;
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ struct v4l2_plane *pdst = &b->m.planes[plane];
+ struct vb2_plane *psrc = &vb->planes[plane];
+
+ pdst->bytesused = psrc->bytesused;
+ pdst->length = psrc->length;
+ if (q->memory == V4L2_MEMORY_MMAP)
+ pdst->m.mem_offset = psrc->m.offset;
+ else if (q->memory == V4L2_MEMORY_USERPTR)
+ pdst->m.userptr = psrc->m.userptr;
+ else if (q->memory == V4L2_MEMORY_DMABUF)
+ pdst->m.fd = psrc->m.fd;
+ pdst->data_offset = psrc->data_offset;
+ memset(pdst->reserved, 0, sizeof(pdst->reserved));
+ }
+ } else {
+ /*
+ * We use length and offset in v4l2_planes array even for
+ * single-planar buffers, but userspace does not.
+ */
+ b->length = vb->planes[0].length;
+ b->bytesused = vb->planes[0].bytesused;
+ if (q->memory == V4L2_MEMORY_MMAP)
+ b->m.offset = vb->planes[0].m.offset;
+ else if (q->memory == V4L2_MEMORY_USERPTR)
+ b->m.userptr = vb->planes[0].m.userptr;
+ else if (q->memory == V4L2_MEMORY_DMABUF)
+ b->m.fd = vb->planes[0].m.fd;
+ }
+
+ /*
+ * Clear any buffer state related flags.
+ */
+ b->flags &= ~V4L2_BUFFER_MASK_FLAGS;
+ b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
+ if ((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) !=
+ V4L2_BUF_FLAG_TIMESTAMP_COPY) {
+ /*
+ * For non-COPY timestamps, drop timestamp source bits
+ * and obtain the timestamp source from the queue.
+ */
+ b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
+ b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
+ }
+
+ switch (vb->state) {
+ case VB2_BUF_STATE_QUEUED:
+ case VB2_BUF_STATE_ACTIVE:
+ b->flags |= V4L2_BUF_FLAG_QUEUED;
+ break;
+ case VB2_BUF_STATE_ERROR:
+ b->flags |= V4L2_BUF_FLAG_ERROR;
+ /* fall through */
+ case VB2_BUF_STATE_DONE:
+ b->flags |= V4L2_BUF_FLAG_DONE;
+ break;
+ case VB2_BUF_STATE_PREPARED:
+ b->flags |= V4L2_BUF_FLAG_PREPARED;
+ break;
+ case VB2_BUF_STATE_PREPARING:
+ case VB2_BUF_STATE_DEQUEUED:
+ /* nothing */
+ break;
+ }
+
+ if (__buffer_in_use(q, vb))
+ b->flags |= V4L2_BUF_FLAG_MAPPED;
+}
+
+/**
+ * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a
+ * v4l2_buffer by the userspace. The caller has already verified that struct
+ * v4l2_buffer has a valid number of planes.
+ */
+void __fill_vb2_buffer(struct vb2_buffer *vb,
+ const struct v4l2_buffer *b, struct vb2_plane *planes)
+{
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ unsigned int plane;
+
+ if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
+ if (b->memory == V4L2_MEMORY_USERPTR) {
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ planes[plane].m.userptr =
+ b->m.planes[plane].m.userptr;
+ planes[plane].length =
+ b->m.planes[plane].length;
+ }
+ }
+ if (b->memory == V4L2_MEMORY_DMABUF) {
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ planes[plane].m.fd =
+ b->m.planes[plane].m.fd;
+ planes[plane].length =
+ b->m.planes[plane].length;
+ }
+ }
+
+ /* Fill in driver-provided information for OUTPUT types */
+ if (V4L2_TYPE_IS_OUTPUT(b->type)) {
+ /*
+ * Will have to go up to b->length when API starts
+ * accepting variable number of planes.
+ *
+ * If bytesused == 0 for the output buffer, then fall
+ * back to the full buffer size. In that case
+ * userspace clearly never bothered to set it and
+ * it's a safe assumption that they really meant to
+ * use the full plane sizes.
+ *
+ * Some drivers, e.g. old codec drivers, use bytesused == 0
+ * as a way to indicate that streaming is finished.
+ * In that case, the driver should use the
+ * allow_zero_bytesused flag to keep old userspace
+ * applications working.
+ */
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ struct vb2_plane *pdst = &planes[plane];
+ struct v4l2_plane *psrc = &b->m.planes[plane];
+
+ if (psrc->bytesused == 0)
+ vb2_warn_zero_bytesused(vb);
+
+ if (vb->vb2_queue->allow_zero_bytesused)
+ pdst->bytesused = psrc->bytesused;
+ else
+ pdst->bytesused = psrc->bytesused ?
+ psrc->bytesused : pdst->length;
+ pdst->data_offset = psrc->data_offset;
+ }
+ }
+ } else {
+ /*
+ * Single-planar buffers do not use planes array,
+ * so fill in relevant v4l2_buffer struct fields instead.
+ * In videobuf we use our internal V4l2_planes struct for
+ * single-planar buffers as well, for simplicity.
+ *
+ * If bytesused == 0 for the output buffer, then fall back
+ * to the full buffer size as that's a sensible default.
+ *
+ * Some drivers, e.g. old codec drivers, use bytesused == 0 as
+ * a way to indicate that streaming is finished. In that case,
+ * the driver should use the allow_zero_bytesused flag to keep
+ * old userspace applications working.
+ */
+ if (b->memory == V4L2_MEMORY_USERPTR) {
+ planes[0].m.userptr = b->m.userptr;
+ planes[0].length = b->length;
+ }
+
+ if (b->memory == V4L2_MEMORY_DMABUF) {
+ planes[0].m.fd = b->m.fd;
+ planes[0].length = b->length;
+ }
+
+ if (V4L2_TYPE_IS_OUTPUT(b->type)) {
+ if (b->bytesused == 0)
+ vb2_warn_zero_bytesused(vb);
+
+ if (vb->vb2_queue->allow_zero_bytesused)
+ planes[0].bytesused = b->bytesused;
+ else
+ planes[0].bytesused = b->bytesused ?
+ b->bytesused : planes[0].length;
+ } else
+ planes[0].bytesused = 0;
+
+ }
+
+ /* Zero flags that the vb2 core handles */
+ vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;
+ if ((vb->vb2_queue->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) !=
+ V4L2_BUF_FLAG_TIMESTAMP_COPY || !V4L2_TYPE_IS_OUTPUT(b->type)) {
+ /*
+ * Non-COPY timestamps and non-OUTPUT queues will get
+ * their timestamp and timestamp source flags from the
+ * queue.
+ */
+ vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
+ }
+
+ if (V4L2_TYPE_IS_OUTPUT(b->type)) {
+ /*
+ * For output buffers mask out the timecode flag:
+ * this will be handled later in vb2_internal_qbuf().
+ * The 'field' is valid metadata for this output buffer
+ * and so that needs to be copied here.
+ */
+ vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
+ vbuf->field = b->field;
+ } else {
+ /* Zero any output buffer flags as this is a capture buffer */
+ vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
+ }
+}
+
+/**
+ * vb2_querybuf() - query video buffer information
+ * @q: videobuf queue
+ * @b: buffer struct passed from userspace to vidioc_querybuf handler
+ * in driver
+ *
+ * Should be called from vidioc_querybuf ioctl handler in driver.
+ * This function will verify the passed v4l2_buffer structure and fill the
+ * relevant information for the userspace.
+ *
+ * The return values from this function are intended to be directly returned
+ * from vidioc_querybuf handler in driver.
+ */
+int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
+{
+ struct vb2_buffer *vb;
+ int ret;
+
+ if (b->type != q->type) {
+ dprintk(1, "wrong buffer type\n");
+ return -EINVAL;
+ }
+
+ if (b->index >= q->num_buffers) {
+ dprintk(1, "buffer index out of range\n");
+ return -EINVAL;
+ }
+ vb = q->bufs[b->index];
+ ret = __verify_planes_array(vb, b);
+ if (!ret)
+ __fill_v4l2_buffer(vb, b);
+ return ret;
+}
+EXPORT_SYMBOL(vb2_querybuf);
+
+/**
+ * vb2_reqbufs() - Wrapper for __reqbufs() that also verifies the memory and
+ * type values.
+ * @q: videobuf2 queue
+ * @req: struct passed from userspace to vidioc_reqbufs handler in driver
+ */
+int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
+{
+ int ret = __verify_memory_type(q, req->memory, req->type);
+
+ return ret ? ret : __reqbufs(q, req);
+}
+EXPORT_SYMBOL_GPL(vb2_reqbufs);
+
+/**
+ * vb2_create_bufs() - Wrapper for __create_bufs() that also verifies the
+ * memory and type values.
+ * @q: videobuf2 queue
+ * @create: creation parameters, passed from userspace to vidioc_create_bufs
+ * handler in driver
+ */
+int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
+{
+ int ret = __verify_memory_type(q, create->memory, create->format.type);
+
+ create->index = q->num_buffers;
+ if (create->count == 0)
+ return ret != -EBUSY ? ret : 0;
+ return ret ? ret : __create_bufs(q, create);
+}
+EXPORT_SYMBOL_GPL(vb2_create_bufs);
+
+/**
+ * vb2_prepare_buf() - Pass ownership of a buffer from userspace to the kernel
+ * @q: videobuf2 queue
+ * @b: buffer structure passed from userspace to vidioc_prepare_buf
+ * handler in driver
+ *
+ * Should be called from vidioc_prepare_buf ioctl handler of a driver.
+ * This function:
+ * 1) verifies the passed buffer,
+ * 2) calls buf_prepare callback in the driver (if provided), in which
+ * driver-specific buffer initialization can be performed,
+ *
+ * The return values from this function are intended to be directly returned
+ * from vidioc_prepare_buf handler in driver.
+ */
+int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
+{
+ struct vb2_buffer *vb;
+ int ret;
+
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "file io in progress\n");
+ return -EBUSY;
+ }
+
+ ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf");
+ if (ret)
+ return ret;
+
+ vb = q->bufs[b->index];
+ if (vb->state != VB2_BUF_STATE_DEQUEUED) {
+ dprintk(1, "invalid buffer state %d\n",
+ vb->state);
+ return -EINVAL;
+ }
+
+ ret = __buf_prepare(vb, b);
+ if (!ret) {
+ /* Fill buffer information for the userspace */
+ __fill_v4l2_buffer(vb, b);
+
+ dprintk(1, "prepare of buffer %d succeeded\n", vb->index);
+ }
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vb2_prepare_buf);
+
+/**
+ * vb2_qbuf() - Queue a buffer from userspace
+ * @q: videobuf2 queue
+ * @b: buffer structure passed from userspace to vidioc_qbuf handler
+ * in driver
+ *
+ * Should be called from vidioc_qbuf ioctl handler of a driver.
+ * This function:
+ * 1) verifies the passed buffer,
+ * 2) if necessary, calls buf_prepare callback in the driver (if provided), in
+ * which driver-specific buffer initialization can be performed,
+ * 3) if streaming is on, queues the buffer in driver by the means of buf_queue
+ * callback for processing.
+ *
+ * The return values from this function are intended to be directly returned
+ * from vidioc_qbuf handler in driver.
+ */
+int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
+{
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "file io in progress\n");
+ return -EBUSY;
+ }
+
+ return vb2_internal_qbuf(q, b);
+}
+EXPORT_SYMBOL_GPL(vb2_qbuf);
+
+/**
+ * vb2_dqbuf() - Dequeue a buffer to the userspace
+ * @q: videobuf2 queue
+ * @b: buffer structure passed from userspace to vidioc_dqbuf handler
+ * in driver
+ * @nonblocking: if true, this call will not sleep waiting for a buffer if no
+ * buffers ready for dequeuing are present. Normally the driver
+ * would be passing (file->f_flags & O_NONBLOCK) here
+ *
+ * Should be called from vidioc_dqbuf ioctl handler of a driver.
+ * This function:
+ * 1) verifies the passed buffer,
+ * 2) calls buf_finish callback in the driver (if provided), in which
+ * driver can perform any additional operations that may be required before
+ * returning the buffer to userspace, such as cache sync,
+ * 3) the buffer struct members are filled with relevant information for
+ * the userspace.
+ *
+ * The return values from this function are intended to be directly returned
+ * from vidioc_dqbuf handler in driver.
+ */
+int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
+{
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "file io in progress\n");
+ return -EBUSY;
+ }
+ return vb2_internal_dqbuf(q, b, nonblocking);
+}
+EXPORT_SYMBOL_GPL(vb2_dqbuf);
+
+/**
+ * vb2_streamon - start streaming
+ * @q: videobuf2 queue
+ * @type: type argument passed from userspace to vidioc_streamon handler
+ *
+ * Should be called from vidioc_streamon handler of a driver.
+ * This function:
+ * 1) verifies current state
+ * 2) passes any previously queued buffers to the driver and starts streaming
+ *
+ * The return values from this function are intended to be directly returned
+ * from vidioc_streamon handler in the driver.
+ */
+int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
+{
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "file io in progress\n");
+ return -EBUSY;
+ }
+ return vb2_internal_streamon(q, type);
+}
+EXPORT_SYMBOL_GPL(vb2_streamon);
+
+/**
+ * vb2_streamoff - stop streaming
+ * @q: videobuf2 queue
+ * @type: type argument passed from userspace to vidioc_streamoff handler
+ *
+ * Should be called from vidioc_streamoff handler of a driver.
+ * This function:
+ * 1) verifies current state,
+ * 2) stop streaming and dequeues any queued buffers, including those previously
+ * passed to the driver (after waiting for the driver to finish).
+ *
+ * This call can be used for pausing playback.
+ * The return values from this function are intended to be directly returned
+ * from vidioc_streamoff handler in the driver
+ */
+int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
+{
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "file io in progress\n");
+ return -EBUSY;
+ }
+ return vb2_internal_streamoff(q, type);
+}
+EXPORT_SYMBOL_GPL(vb2_streamoff);
+
+/**
+ * vb2_queue_init() - initialize a videobuf2 queue
+ * @q: videobuf2 queue; this structure should be allocated in driver
+ *
+ * The vb2_queue structure should be allocated by the driver. The driver is
+ * responsible of clearing it's content and setting initial values for some
+ * required entries before calling this function.
+ * q->ops, q->mem_ops, q->type and q->io_modes are mandatory. Please refer
+ * to the struct vb2_queue description in include/media/videobuf2-core.h
+ * for more information.
+ */
+int vb2_queue_init(struct vb2_queue *q)
+{
+ /*
+ * Sanity check
+ */
+ if (WARN_ON(!q) ||
+ WARN_ON(!q->ops) ||
+ WARN_ON(!q->mem_ops) ||
+ WARN_ON(!q->type) ||
+ WARN_ON(!q->io_modes) ||
+ WARN_ON(!q->ops->queue_setup) ||
+ WARN_ON(!q->ops->buf_queue) ||
+ WARN_ON(q->timestamp_flags &
+ ~(V4L2_BUF_FLAG_TIMESTAMP_MASK |
+ V4L2_BUF_FLAG_TSTAMP_SRC_MASK)))
+ return -EINVAL;
+
+ /* Warn that the driver should choose an appropriate timestamp type */
+ WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
+ V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN);
+
+ INIT_LIST_HEAD(&q->queued_list);
+ INIT_LIST_HEAD(&q->done_list);
+ spin_lock_init(&q->done_lock);
+ mutex_init(&q->mmap_lock);
+ init_waitqueue_head(&q->done_wq);
+
+ if (q->buf_struct_size == 0)
+ q->buf_struct_size = sizeof(struct vb2_buffer);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vb2_queue_init);
+
+/**
+ * vb2_queue_release() - stop streaming, release the queue and free memory
+ * @q: videobuf2 queue
+ *
+ * This function stops streaming and performs necessary clean ups, including
+ * freeing video buffer memory. The driver is responsible for freeing
+ * the vb2_queue structure itself.
+ */
+void vb2_queue_release(struct vb2_queue *q)
+{
+ __vb2_cleanup_fileio(q);
+ __vb2_queue_cancel(q);
+ mutex_lock(&q->mmap_lock);
+ __vb2_queue_free(q, q->num_buffers);
+ mutex_unlock(&q->mmap_lock);
+}
+EXPORT_SYMBOL_GPL(vb2_queue_release);
+
+/**
+ * struct vb2_fileio_buf - buffer context used by file io emulator
+ *
+ * vb2 provides a compatibility layer and emulator of file io (read and
+ * write) calls on top of streaming API. This structure is used for
+ * tracking context related to the buffers.
+ */
+struct vb2_fileio_buf {
+ void *vaddr;
+ unsigned int size;
+ unsigned int pos;
+ unsigned int queued:1;
+};
+
+/**
+ * struct vb2_fileio_data - queue context used by file io emulator
+ *
+ * @cur_index: the index of the buffer currently being read from or
+ * written to. If equal to q->num_buffers then a new buffer
+ * must be dequeued.
+ * @initial_index: in the read() case all buffers are queued up immediately
+ * in __vb2_init_fileio() and __vb2_perform_fileio() just cycles
+ * buffers. However, in the write() case no buffers are initially
+ * queued, instead whenever a buffer is full it is queued up by
+ * __vb2_perform_fileio(). Only once all available buffers have
+ * been queued up will __vb2_perform_fileio() start to dequeue
+ * buffers. This means that initially __vb2_perform_fileio()
+ * needs to know what buffer index to use when it is queuing up
+ * the buffers for the first time. That initial index is stored
+ * in this field. Once it is equal to q->num_buffers all
+ * available buffers have been queued and __vb2_perform_fileio()
+ * should start the normal dequeue/queue cycle.
+ *
+ * vb2 provides a compatibility layer and emulator of file io (read and
+ * write) calls on top of streaming API. For proper operation it required
+ * this structure to save the driver state between each call of the read
+ * or write function.
+ */
+struct vb2_fileio_data {
+ struct v4l2_requestbuffers req;
+ struct v4l2_plane p;
+ struct v4l2_buffer b;
+ struct vb2_fileio_buf bufs[VB2_MAX_FRAME];
+ unsigned int cur_index;
+ unsigned int initial_index;
+ unsigned int q_count;
+ unsigned int dq_count;
+ unsigned read_once:1;
+ unsigned write_immediately:1;
+};
+
+/**
+ * __vb2_init_fileio() - initialize file io emulator
+ * @q: videobuf2 queue
+ * @read: mode selector (1 means read, 0 means write)
+ */
+static int __vb2_init_fileio(struct vb2_queue *q, int read)
+{
+ struct vb2_fileio_data *fileio;
+ int i, ret;
+ unsigned int count = 0;
+
+ /*
+ * Sanity check
+ */
+ if (WARN_ON((read && !(q->io_modes & VB2_READ)) ||
+ (!read && !(q->io_modes & VB2_WRITE))))
+ return -EINVAL;
+
+ /*
+ * Check if device supports mapping buffers to kernel virtual space.
+ */
+ if (!q->mem_ops->vaddr)
+ return -EBUSY;
+
+ /*
+ * Check if streaming api has not been already activated.
+ */
+ if (q->streaming || q->num_buffers > 0)
+ return -EBUSY;
+
+ /*
+ * Start with count 1, driver can increase it in queue_setup()
+ */
+ count = 1;
+
+ dprintk(3, "setting up file io: mode %s, count %d, read_once %d, write_immediately %d\n",
+ (read) ? "read" : "write", count, q->fileio_read_once,
+ q->fileio_write_immediately);
+
+ fileio = kzalloc(sizeof(struct vb2_fileio_data), GFP_KERNEL);
+ if (fileio == NULL)
+ return -ENOMEM;
+
+ fileio->read_once = q->fileio_read_once;
+ fileio->write_immediately = q->fileio_write_immediately;
+
+ /*
+ * Request buffers and use MMAP type to force driver
+ * to allocate buffers by itself.
+ */
+ fileio->req.count = count;
+ fileio->req.memory = V4L2_MEMORY_MMAP;
+ fileio->req.type = q->type;
+ q->fileio = fileio;
+ ret = __reqbufs(q, &fileio->req);
+ if (ret)
+ goto err_kfree;
+
+ /*
+ * Check if plane_count is correct
+ * (multiplane buffers are not supported).
+ */
+ if (q->bufs[0]->num_planes != 1) {
+ ret = -EBUSY;
+ goto err_reqbufs;
+ }
+
+ /*
+ * Get kernel address of each buffer.
+ */
+ for (i = 0; i < q->num_buffers; i++) {
+ fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0);
+ if (fileio->bufs[i].vaddr == NULL) {
+ ret = -EINVAL;
+ goto err_reqbufs;
+ }
+ fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0);
+ }
+
+ /*
+ * Read mode requires pre queuing of all buffers.
+ */
+ if (read) {
+ bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
+
+ /*
+ * Queue all buffers.
+ */
+ for (i = 0; i < q->num_buffers; i++) {
+ struct v4l2_buffer *b = &fileio->b;
+
+ memset(b, 0, sizeof(*b));
+ b->type = q->type;
+ if (is_multiplanar) {
+ memset(&fileio->p, 0, sizeof(fileio->p));
+ b->m.planes = &fileio->p;
+ b->length = 1;
+ }
+ b->memory = q->memory;
+ b->index = i;
+ ret = vb2_internal_qbuf(q, b);
+ if (ret)
+ goto err_reqbufs;
+ fileio->bufs[i].queued = 1;
+ }
+ /*
+ * All buffers have been queued, so mark that by setting
+ * initial_index to q->num_buffers
+ */
+ fileio->initial_index = q->num_buffers;
+ fileio->cur_index = q->num_buffers;
+ }
+
+ /*
+ * Start streaming.
+ */
+ ret = vb2_internal_streamon(q, q->type);
+ if (ret)
+ goto err_reqbufs;
+
+ return ret;
+
+err_reqbufs:
+ fileio->req.count = 0;
+ __reqbufs(q, &fileio->req);
+
+err_kfree:
+ q->fileio = NULL;
+ kfree(fileio);
+ return ret;
+}
+
+/**
+ * __vb2_cleanup_fileio() - free resourced used by file io emulator
+ * @q: videobuf2 queue
+ */
+int __vb2_cleanup_fileio(struct vb2_queue *q)
+{
+ struct vb2_fileio_data *fileio = q->fileio;
+
+ if (fileio) {
+ vb2_internal_streamoff(q, q->type);
+ q->fileio = NULL;
+ fileio->req.count = 0;
+ vb2_reqbufs(q, &fileio->req);
+ kfree(fileio);
+ dprintk(3, "file io emulator closed\n");
+ }
+ return 0;
+}
+
+/**
+ * __vb2_perform_fileio() - perform a single file io (read or write) operation
+ * @q: videobuf2 queue
+ * @data: pointed to target userspace buffer
+ * @count: number of bytes to read or write
+ * @ppos: file handle position tracking pointer
+ * @nonblock: mode selector (1 means blocking calls, 0 means nonblocking)
+ * @read: access mode selector (1 means read, 0 means write)
+ */
+static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_t count,
+ loff_t *ppos, int nonblock, int read)
+{
+ struct vb2_fileio_data *fileio;
+ struct vb2_fileio_buf *buf;
+ bool is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
+ /*
+ * When using write() to write data to an output video node the vb2 core
+ * should set timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody
+ * else is able to provide this information with the write() operation.
+ */
+ bool set_timestamp = !read &&
+ (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
+ V4L2_BUF_FLAG_TIMESTAMP_COPY;
+ int ret, index;
+
+ dprintk(3, "mode %s, offset %ld, count %zd, %sblocking\n",
+ read ? "read" : "write", (long)*ppos, count,
+ nonblock ? "non" : "");
+
+ if (!data)
+ return -EINVAL;
+
+ /*
+ * Initialize emulator on first call.
+ */
+ if (!vb2_fileio_is_active(q)) {
+ ret = __vb2_init_fileio(q, read);
+ dprintk(3, "vb2_init_fileio result: %d\n", ret);
+ if (ret)
+ return ret;
+ }
+ fileio = q->fileio;
+
+ /*
+ * Check if we need to dequeue the buffer.
+ */
+ index = fileio->cur_index;
+ if (index >= q->num_buffers) {
+ /*
+ * Call vb2_dqbuf to get buffer back.
+ */
+ memset(&fileio->b, 0, sizeof(fileio->b));
+ fileio->b.type = q->type;
+ fileio->b.memory = q->memory;
+ if (is_multiplanar) {
+ memset(&fileio->p, 0, sizeof(fileio->p));
+ fileio->b.m.planes = &fileio->p;
+ fileio->b.length = 1;
+ }
+ ret = vb2_internal_dqbuf(q, &fileio->b, nonblock);
+ dprintk(5, "vb2_dqbuf result: %d\n", ret);
+ if (ret)
+ return ret;
+ fileio->dq_count += 1;
+
+ fileio->cur_index = index = fileio->b.index;
+ buf = &fileio->bufs[index];
+
+ /*
+ * Get number of bytes filled by the driver
+ */
+ buf->pos = 0;
+ buf->queued = 0;
+ buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0)
+ : vb2_plane_size(q->bufs[index], 0);
+ /* Compensate for data_offset on read in the multiplanar case. */
+ if (is_multiplanar && read &&
+ fileio->b.m.planes[0].data_offset < buf->size) {
+ buf->pos = fileio->b.m.planes[0].data_offset;
+ buf->size -= buf->pos;
+ }
+ } else {
+ buf = &fileio->bufs[index];
+ }
+
+ /*
+ * Limit count on last few bytes of the buffer.
+ */
+ if (buf->pos + count > buf->size) {
+ count = buf->size - buf->pos;
+ dprintk(5, "reducing read count: %zd\n", count);
+ }
+
+ /*
+ * Transfer data to userspace.
+ */
+ dprintk(3, "copying %zd bytes - buffer %d, offset %u\n",
+ count, index, buf->pos);
+ if (read)
+ ret = copy_to_user(data, buf->vaddr + buf->pos, count);
+ else
+ ret = copy_from_user(buf->vaddr + buf->pos, data, count);
+ if (ret) {
+ dprintk(3, "error copying data\n");
+ return -EFAULT;
+ }
+
+ /*
+ * Update counters.
+ */
+ buf->pos += count;
+ *ppos += count;
+
+ /*
+ * Queue next buffer if required.
+ */
+ if (buf->pos == buf->size || (!read && fileio->write_immediately)) {
+ /*
+ * Check if this is the last buffer to read.
+ */
+ if (read && fileio->read_once && fileio->dq_count == 1) {
+ dprintk(3, "read limit reached\n");
+ return __vb2_cleanup_fileio(q);
+ }
+
+ /*
+ * Call vb2_qbuf and give buffer to the driver.
+ */
+ memset(&fileio->b, 0, sizeof(fileio->b));
+ fileio->b.type = q->type;
+ fileio->b.memory = q->memory;
+ fileio->b.index = index;
+ fileio->b.bytesused = buf->pos;
+ if (is_multiplanar) {
+ memset(&fileio->p, 0, sizeof(fileio->p));
+ fileio->p.bytesused = buf->pos;
+ fileio->b.m.planes = &fileio->p;
+ fileio->b.length = 1;
+ }
+ if (set_timestamp)
+ v4l2_get_timestamp(&fileio->b.timestamp);
+ ret = vb2_internal_qbuf(q, &fileio->b);
+ dprintk(5, "vb2_dbuf result: %d\n", ret);
+ if (ret)
+ return ret;
+
+ /*
+ * Buffer has been queued, update the status
+ */
+ buf->pos = 0;
+ buf->queued = 1;
+ buf->size = vb2_plane_size(q->bufs[index], 0);
+ fileio->q_count += 1;
+ /*
+ * If we are queuing up buffers for the first time, then
+ * increase initial_index by one.
+ */
+ if (fileio->initial_index < q->num_buffers)
+ fileio->initial_index++;
+ /*
+ * The next buffer to use is either a buffer that's going to be
+ * queued for the first time (initial_index < q->num_buffers)
+ * or it is equal to q->num_buffers, meaning that the next
+ * time we need to dequeue a buffer since we've now queued up
+ * all the 'first time' buffers.
+ */
+ fileio->cur_index = fileio->initial_index;
+ }
+
+ /*
+ * Return proper number of bytes processed.
+ */
+ if (ret == 0)
+ ret = count;
+ return ret;
+}
+
+/**
+ * vb2_poll() - implements poll userspace operation
+ * @q: videobuf2 queue
+ * @file: file argument passed to the poll file operation handler
+ * @wait: wait argument passed to the poll file operation handler
+ *
+ * This function implements poll file operation handler for a driver.
+ * For CAPTURE queues, if a buffer is ready to be dequeued, the userspace will
+ * be informed that the file descriptor of a video device is available for
+ * reading.
+ * For OUTPUT queues, if a buffer is ready to be dequeued, the file descriptor
+ * will be reported as available for writing.
+ *
+ * If the driver uses struct v4l2_fh, then vb2_poll() will also check for any
+ * pending events.
+ *
+ * The return values from this function are intended to be directly returned
+ * from poll handler in driver.
+ */
+unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
+{
+ struct video_device *vfd = video_devdata(file);
+ unsigned long req_events = poll_requested_events(wait);
+ struct vb2_buffer *vb = NULL;
+ unsigned int res = 0;
+ unsigned long flags;
+
+ if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
+ struct v4l2_fh *fh = file->private_data;
+
+ if (v4l2_event_pending(fh))
+ res = POLLPRI;
+ else if (req_events & POLLPRI)
+ poll_wait(file, &fh->wait, wait);
+ }
+
+ if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM)))
+ return res;
+ if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM)))
+ return res;
+
+ /*
+ * Start file I/O emulator only if streaming API has not been used yet.
+ */
+ if (q->num_buffers == 0 && !vb2_fileio_is_active(q)) {
+ if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) &&
+ (req_events & (POLLIN | POLLRDNORM))) {
+ if (__vb2_init_fileio(q, 1))
+ return res | POLLERR;
+ }
+ if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) &&
+ (req_events & (POLLOUT | POLLWRNORM))) {
+ if (__vb2_init_fileio(q, 0))
+ return res | POLLERR;
+ /*
+ * Write to OUTPUT queue can be done immediately.
+ */
+ return res | POLLOUT | POLLWRNORM;
+ }
+ }
+
+ /*
+ * There is nothing to wait for if the queue isn't streaming, or if the
+ * error flag is set.
+ */
+ if (!vb2_is_streaming(q) || q->error)
+ return res | POLLERR;
+ /*
+ * For compatibility with vb1: if QBUF hasn't been called yet, then
+ * return POLLERR as well. This only affects capture queues, output
+ * queues will always initialize waiting_for_buffers to false.
+ */
+ if (q->waiting_for_buffers)
+ return res | POLLERR;
+
+ /*
+ * For output streams you can write as long as there are fewer buffers
+ * queued than there are buffers available.
+ */
+ if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers)
+ return res | POLLOUT | POLLWRNORM;
+
+ if (list_empty(&q->done_list)) {
+ /*
+ * If the last buffer was dequeued from a capture queue,
+ * return immediately. DQBUF will return -EPIPE.
+ */
+ if (q->last_buffer_dequeued)
+ return res | POLLIN | POLLRDNORM;
+
+ poll_wait(file, &q->done_wq, wait);
+ }
+
+ /*
+ * Take first buffer available for dequeuing.
+ */
+ spin_lock_irqsave(&q->done_lock, flags);
+ if (!list_empty(&q->done_list))
+ vb = list_first_entry(&q->done_list, struct vb2_buffer,
+ done_entry);
+ spin_unlock_irqrestore(&q->done_lock, flags);
+
+ if (vb && (vb->state == VB2_BUF_STATE_DONE
+ || vb->state == VB2_BUF_STATE_ERROR)) {
+ return (V4L2_TYPE_IS_OUTPUT(q->type)) ?
+ res | POLLOUT | POLLWRNORM :
+ res | POLLIN | POLLRDNORM;
+ }
+ return res;
+}
+EXPORT_SYMBOL_GPL(vb2_poll);
+
+size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
+ loff_t *ppos, int nonblocking)
+{
+ return __vb2_perform_fileio(q, data, count, ppos, nonblocking, 1);
+}
+EXPORT_SYMBOL_GPL(vb2_read);
+
+size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
+ loff_t *ppos, int nonblocking)
+{
+ return __vb2_perform_fileio(q, (char __user *) data, count,
+ ppos, nonblocking, 0);
+}
+EXPORT_SYMBOL_GPL(vb2_write);
+
+struct vb2_threadio_data {
+ struct task_struct *thread;
+ vb2_thread_fnc fnc;
+ void *priv;
+ bool stop;
+};
+
+static int vb2_thread(void *data)
+{
+ struct vb2_queue *q = data;
+ struct vb2_threadio_data *threadio = q->threadio;
+ struct vb2_fileio_data *fileio = q->fileio;
+ bool set_timestamp = false;
+ int prequeue = 0;
+ int index = 0;
+ int ret = 0;
+
+ if (V4L2_TYPE_IS_OUTPUT(q->type)) {
+ prequeue = q->num_buffers;
+ set_timestamp =
+ (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
+ V4L2_BUF_FLAG_TIMESTAMP_COPY;
+ }
+
+ set_freezable();
+
+ for (;;) {
+ struct vb2_buffer *vb;
+
+ /*
+ * Call vb2_dqbuf to get buffer back.
+ */
+ memset(&fileio->b, 0, sizeof(fileio->b));
+ fileio->b.type = q->type;
+ fileio->b.memory = q->memory;
+ if (prequeue) {
+ fileio->b.index = index++;
+ prequeue--;
+ } else {
+ call_void_qop(q, wait_finish, q);
+ if (!threadio->stop)
+ ret = vb2_internal_dqbuf(q, &fileio->b, 0);
+ call_void_qop(q, wait_prepare, q);
+ dprintk(5, "file io: vb2_dqbuf result: %d\n", ret);
+ }
+ if (ret || threadio->stop)
+ break;
+ try_to_freeze();
+
+ vb = q->bufs[fileio->b.index];
+ if (!(fileio->b.flags & V4L2_BUF_FLAG_ERROR))
+ if (threadio->fnc(vb, threadio->priv))
+ break;
+ call_void_qop(q, wait_finish, q);
+ if (set_timestamp)
+ v4l2_get_timestamp(&fileio->b.timestamp);
+ if (!threadio->stop)
+ ret = vb2_internal_qbuf(q, &fileio->b);
+ call_void_qop(q, wait_prepare, q);
+ if (ret || threadio->stop)
+ break;
+ }
+
+ /* Hmm, linux becomes *very* unhappy without this ... */
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ }
+ return 0;
+}
+
+/*
+ * This function should not be used for anything else but the videobuf2-dvb
+ * support. If you think you have another good use-case for this, then please
+ * contact the linux-media mailinglist first.
+ */
+int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
+ const char *thread_name)
+{
+ struct vb2_threadio_data *threadio;
+ int ret = 0;
+
+ if (q->threadio)
+ return -EBUSY;
+ if (vb2_is_busy(q))
+ return -EBUSY;
+ if (WARN_ON(q->fileio))
+ return -EBUSY;
+
+ threadio = kzalloc(sizeof(*threadio), GFP_KERNEL);
+ if (threadio == NULL)
+ return -ENOMEM;
+ threadio->fnc = fnc;
+ threadio->priv = priv;
+
+ ret = __vb2_init_fileio(q, !V4L2_TYPE_IS_OUTPUT(q->type));
+ dprintk(3, "file io: vb2_init_fileio result: %d\n", ret);
+ if (ret)
+ goto nomem;
+ q->threadio = threadio;
+ threadio->thread = kthread_run(vb2_thread, q, "vb2-%s", thread_name);
+ if (IS_ERR(threadio->thread)) {
+ ret = PTR_ERR(threadio->thread);
+ threadio->thread = NULL;
+ goto nothread;
+ }
+ return 0;
+
+nothread:
+ __vb2_cleanup_fileio(q);
+nomem:
+ kfree(threadio);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vb2_thread_start);
+
+int vb2_thread_stop(struct vb2_queue *q)
+{
+ struct vb2_threadio_data *threadio = q->threadio;
+ int err;
+
+ if (threadio == NULL)
+ return 0;
+ threadio->stop = true;
+ /* Wake up all pending sleeps in the thread */
+ vb2_queue_error(q);
+ err = kthread_stop(threadio->thread);
+ __vb2_cleanup_fileio(q);
+ threadio->thread = NULL;
+ kfree(threadio);
+ q->threadio = NULL;
+ return err;
+}
+EXPORT_SYMBOL_GPL(vb2_thread_stop);
+
+/*
+ * The following functions are not part of the vb2 core API, but are helper
+ * functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations
+ * and struct vb2_ops.
+ * They contain boilerplate code that most if not all drivers have to do
+ * and so they simplify the driver code.
+ */
+
+/* The queue is busy if there is a owner and you are not that owner. */
+static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file)
+{
+ return vdev->queue->owner && vdev->queue->owner != file->private_data;
+}
+
+/* vb2 ioctl helpers */
+
+int vb2_ioctl_reqbufs(struct file *file, void *priv,
+ struct v4l2_requestbuffers *p)
+{
+ struct video_device *vdev = video_devdata(file);
+ int res = __verify_memory_type(vdev->queue, p->memory, p->type);
+
+ if (res)
+ return res;
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ res = __reqbufs(vdev->queue, p);
+ /* If count == 0, then the owner has released all buffers and he
+ is no longer owner of the queue. Otherwise we have a new owner. */
+ if (res == 0)
+ vdev->queue->owner = p->count ? file->private_data : NULL;
+ return res;
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs);
+
+int vb2_ioctl_create_bufs(struct file *file, void *priv,
+ struct v4l2_create_buffers *p)
+{
+ struct video_device *vdev = video_devdata(file);
+ int res = __verify_memory_type(vdev->queue, p->memory, p->format.type);
+
+ p->index = vdev->queue->num_buffers;
+ /* If count == 0, then just check if memory and type are valid.
+ Any -EBUSY result from __verify_memory_type can be mapped to 0. */
+ if (p->count == 0)
+ return res != -EBUSY ? res : 0;
+ if (res)
+ return res;
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ res = __create_bufs(vdev->queue, p);
+ if (res == 0)
+ vdev->queue->owner = file->private_data;
+ return res;
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs);
+
+int vb2_ioctl_prepare_buf(struct file *file, void *priv,
+ struct v4l2_buffer *p)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ return vb2_prepare_buf(vdev->queue, p);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);
+
+int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ /* No need to call vb2_queue_is_busy(), anyone can query buffers. */
+ return vb2_querybuf(vdev->queue, p);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf);
+
+int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ return vb2_qbuf(vdev->queue, p);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);
+
+int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf);
+
+int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ return vb2_streamon(vdev->queue, i);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_streamon);
+
+int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ return vb2_streamoff(vdev->queue, i);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff);
+
+int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ return vb2_expbuf(vdev->queue, p);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);
+
+/* v4l2_file_operations helpers */
+
+int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ return vb2_mmap(vdev->queue, vma);
+}
+EXPORT_SYMBOL_GPL(vb2_fop_mmap);
+
+int _vb2_fop_release(struct file *file, struct mutex *lock)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ if (lock)
+ mutex_lock(lock);
+ if (file->private_data == vdev->queue->owner) {
+ vb2_queue_release(vdev->queue);
+ vdev->queue->owner = NULL;
+ }
+ if (lock)
+ mutex_unlock(lock);
+ return v4l2_fh_release(file);
+}
+EXPORT_SYMBOL_GPL(_vb2_fop_release);
+
+int vb2_fop_release(struct file *file)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
+
+ return _vb2_fop_release(file, lock);
+}
+EXPORT_SYMBOL_GPL(vb2_fop_release);
+
+ssize_t vb2_fop_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
+ int err = -EBUSY;
+
+ if (!(vdev->queue->io_modes & VB2_WRITE))
+ return -EINVAL;
+ if (lock && mutex_lock_interruptible(lock))
+ return -ERESTARTSYS;
+ if (vb2_queue_is_busy(vdev, file))
+ goto exit;
+ err = vb2_write(vdev->queue, buf, count, ppos,
+ file->f_flags & O_NONBLOCK);
+ if (vdev->queue->fileio)
+ vdev->queue->owner = file->private_data;
+exit:
+ if (lock)
+ mutex_unlock(lock);
+ return err;
+}
+EXPORT_SYMBOL_GPL(vb2_fop_write);
+
+ssize_t vb2_fop_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
+ int err = -EBUSY;
+
+ if (!(vdev->queue->io_modes & VB2_READ))
+ return -EINVAL;
+ if (lock && mutex_lock_interruptible(lock))
+ return -ERESTARTSYS;
+ if (vb2_queue_is_busy(vdev, file))
+ goto exit;
+ err = vb2_read(vdev->queue, buf, count, ppos,
+ file->f_flags & O_NONBLOCK);
+ if (vdev->queue->fileio)
+ vdev->queue->owner = file->private_data;
+exit:
+ if (lock)
+ mutex_unlock(lock);
+ return err;
+}
+EXPORT_SYMBOL_GPL(vb2_fop_read);
+
+unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
+{
+ struct video_device *vdev = video_devdata(file);
+ struct vb2_queue *q = vdev->queue;
+ struct mutex *lock = q->lock ? q->lock : vdev->lock;
+ unsigned res;
+ void *fileio;
+
+ /*
+ * If this helper doesn't know how to lock, then you shouldn't be using
+ * it but you should write your own.
+ */
+ WARN_ON(!lock);
+
+ if (lock && mutex_lock_interruptible(lock))
+ return POLLERR;
+
+ fileio = q->fileio;
+
+ res = vb2_poll(vdev->queue, file, wait);
+
+ /* If fileio was started, then we have a new queue owner. */
+ if (!fileio && q->fileio)
+ q->owner = file->private_data;
+ if (lock)
+ mutex_unlock(lock);
+ return res;
+}
+EXPORT_SYMBOL_GPL(vb2_fop_poll);
+
+#ifndef CONFIG_MMU
+unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags)
+{
+ struct video_device *vdev = video_devdata(file);
+
+ return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags);
+}
+EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area);
+#endif
+
+/* vb2_ops helpers. Only use if vq->lock is non-NULL. */
+
+void vb2_ops_wait_prepare(struct vb2_queue *vq)
+{
+ mutex_unlock(vq->lock);
+}
+EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare);
+
+void vb2_ops_wait_finish(struct vb2_queue *vq)
+{
+ mutex_lock(vq->lock);
+}
+EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);
+
MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");
MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
MODULE_LICENSE("GPL");
@@ -380,7 +380,8 @@ struct vb2_ops {
* @drv_priv: driver private data
* @buf_struct_size: size of the driver-specific buffer structure;
* "0" indicates the driver doesn't want to use a custom buffer
- * structure type, so sizeof(struct vb2_buffer) will is used
+ * structure type. for example, sizeof(struct vb2_v4l2_buffer)
+ * will be used for v4l2.
* @timestamp_flags: Timestamp flags; V4L2_BUF_FLAG_TIMESTAMP_* and
* V4L2_BUF_FLAG_TSTAMP_SRC_*
* @gfp_flags: additional gfp flags used when allocating the buffers.
@@ -481,23 +482,9 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);
void vb2_discard_done(struct vb2_queue *q);
int vb2_wait_for_all_buffers(struct vb2_queue *q);
-int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
-int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
-
-int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
-int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
-
-int __must_check vb2_queue_init(struct vb2_queue *q);
-
-void vb2_queue_release(struct vb2_queue *q);
void vb2_queue_error(struct vb2_queue *q);
-int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb);
-int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);
-
-int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
-int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma);
#ifndef CONFIG_MMU
@@ -507,41 +494,6 @@ unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
unsigned long pgoff,
unsigned long flags);
#endif
-unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
-size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
- loff_t *ppos, int nonblock);
-size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
- loff_t *ppos, int nonblock);
-
-/*
- * vb2_thread_fnc - callback function for use with vb2_thread
- *
- * This is called whenever a buffer is dequeued in the thread.
- */
-typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv);
-
-/**
- * vb2_thread_start() - start a thread for the given queue.
- * @q: videobuf queue
- * @fnc: callback function
- * @priv: priv pointer passed to the callback function
- * @thread_name:the name of the thread. This will be prefixed with "vb2-".
- *
- * This starts a thread that will queue and dequeue until an error occurs
- * or @vb2_thread_stop is called.
- *
- * This function should not be used for anything else but the videobuf2-dvb
- * support. If you think you have another good use-case for this, then please
- * contact the linux-media mailinglist first.
- */
-int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
- const char *thread_name);
-
-/**
- * vb2_thread_stop() - stop the thread for the given queue.
- * @q: videobuf queue
- */
-int vb2_thread_stop(struct vb2_queue *q);
/**
* vb2_is_streaming() - return streaming status of the queue
@@ -553,23 +505,6 @@ static inline bool vb2_is_streaming(struct vb2_queue *q)
}
/**
- * vb2_fileio_is_active() - return true if fileio is active.
- * @q: videobuf queue
- *
- * This returns true if read() or write() is used to stream the data
- * as opposed to stream I/O. This is almost never an important distinction,
- * except in rare cases. One such case is that using read() or write() to
- * stream a format using V4L2_FIELD_ALTERNATE is not allowed since there
- * is no way you can pass the field information of each buffer to/from
- * userspace. A driver that supports this field format should check for
- * this in the queue_setup op and reject it if this function returns true.
- */
-static inline bool vb2_fileio_is_active(struct vb2_queue *q)
-{
- return q->fileio;
-}
-
-/**
* vb2_is_busy() - return busy status of the queue
* @q: videobuf queue
*
@@ -645,48 +580,4 @@ static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q)
{
q->last_buffer_dequeued = false;
}
-
-/*
- * The following functions are not part of the vb2 core API, but are simple
- * helper functions that you can use in your struct v4l2_file_operations,
- * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
- * or video_device->lock is set, and they will set and test vb2_queue->owner
- * to check if the calling filehandle is permitted to do the queuing operation.
- */
-
-/* struct v4l2_ioctl_ops helpers */
-
-int vb2_ioctl_reqbufs(struct file *file, void *priv,
- struct v4l2_requestbuffers *p);
-int vb2_ioctl_create_bufs(struct file *file, void *priv,
- struct v4l2_create_buffers *p);
-int vb2_ioctl_prepare_buf(struct file *file, void *priv,
- struct v4l2_buffer *p);
-int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p);
-int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p);
-int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p);
-int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
-int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
-int vb2_ioctl_expbuf(struct file *file, void *priv,
- struct v4l2_exportbuffer *p);
-
-/* struct v4l2_file_operations helpers */
-
-int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma);
-int vb2_fop_release(struct file *file);
-int _vb2_fop_release(struct file *file, struct mutex *lock);
-ssize_t vb2_fop_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos);
-ssize_t vb2_fop_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos);
-unsigned int vb2_fop_poll(struct file *file, poll_table *wait);
-#ifndef CONFIG_MMU
-unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
- unsigned long len, unsigned long pgoff, unsigned long flags);
-#endif
-
-/* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
-
-void vb2_ops_wait_prepare(struct vb2_queue *vq);
-void vb2_ops_wait_finish(struct vb2_queue *vq);
#endif /* _MEDIA_VIDEOBUF2_CORE_H */
@@ -42,4 +42,116 @@ struct vb2_v4l2_buffer {
#define to_vb2_v4l2_buffer(vb) \
(container_of(vb, struct vb2_v4l2_buffer, vb2_buf))
+int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
+int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
+
+int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
+int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
+
+int __must_check vb2_queue_init(struct vb2_queue *q);
+
+void vb2_queue_release(struct vb2_queue *q);
+
+int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
+int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);
+
+int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
+int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
+
+unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait);
+size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
+ loff_t *ppos, int nonblock);
+size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
+ loff_t *ppos, int nonblock);
+
+/*
+ * vb2_thread_fnc - callback function for use with vb2_thread
+ *
+ * This is called whenever a buffer is dequeued in the thread.
+ */
+typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv);
+
+/**
+ * vb2_thread_start() - start a thread for the given queue.
+ * @q: videobuf queue
+ * @fnc: callback function
+ * @priv: priv pointer passed to the callback function
+ * @thread_name:the name of the thread. This will be prefixed with "vb2-".
+ *
+ * This starts a thread that will queue and dequeue until an error occurs
+ * or @vb2_thread_stop is called.
+ *
+ * This function should not be used for anything else but the videobuf2-dvb
+ * support. If you think you have another good use-case for this, then please
+ * contact the linux-media mailinglist first.
+ */
+int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
+ const char *thread_name);
+
+/**
+ * vb2_thread_stop() - stop the thread for the given queue.
+ * @q: videobuf queue
+ */
+int vb2_thread_stop(struct vb2_queue *q);
+
+/**
+ * vb2_fileio_is_active() - return true if fileio is active.
+ * @q: videobuf queue
+ *
+ * This returns true if read() or write() is used to stream the data
+ * as opposed to stream I/O. This is almost never an important distinction,
+ * except in rare cases. One such case is that using read() or write() to
+ * stream a format using V4L2_FIELD_ALTERNATE is not allowed since there
+ * is no way you can pass the field information of each buffer to/from
+ * userspace. A driver that supports this field format should check for
+ * this in the queue_setup op and reject it if this function returns true.
+ */
+static inline bool vb2_fileio_is_active(struct vb2_queue *q)
+{
+ return q->fileio;
+}
+
+/*
+ * The following functions are not part of the vb2 core API, but are simple
+ * helper functions that you can use in your struct v4l2_file_operations,
+ * struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
+ * or video_device->lock is set, and they will set and test vb2_queue->owner
+ * to check if the calling filehandle is permitted to do the queuing operation.
+ */
+
+/* struct v4l2_ioctl_ops helpers */
+
+int vb2_ioctl_reqbufs(struct file *file, void *priv,
+ struct v4l2_requestbuffers *p);
+int vb2_ioctl_create_bufs(struct file *file, void *priv,
+ struct v4l2_create_buffers *p);
+int vb2_ioctl_prepare_buf(struct file *file, void *priv,
+ struct v4l2_buffer *p);
+int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p);
+int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p);
+int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p);
+int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
+int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
+int vb2_ioctl_expbuf(struct file *file, void *priv,
+ struct v4l2_exportbuffer *p);
+
+/* struct v4l2_file_operations helpers */
+
+int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma);
+int vb2_fop_release(struct file *file);
+int _vb2_fop_release(struct file *file, struct mutex *lock);
+ssize_t vb2_fop_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos);
+ssize_t vb2_fop_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos);
+unsigned int vb2_fop_poll(struct file *file, poll_table *wait);
+#ifndef CONFIG_MMU
+unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
+ unsigned long len, unsigned long pgoff, unsigned long flags);
+#endif
+
+/* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
+
+void vb2_ops_wait_prepare(struct vb2_queue *vq);
+void vb2_ops_wait_finish(struct vb2_queue *vq);
#endif /* _MEDIA_VIDEOBUF2_V4L2_H */