--- /dev/null
-unsigned int vb2_core_poll(struct vb2_queue *q, struct file *file,
+ /*
+ * videobuf2-core.c - video buffer 2 core framework
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Pawel Osciak <pawel@osciak.com>
+ * Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * The vb2_thread implementation was based on code from videobuf-dvb.c:
+ * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+ #include <linux/err.h>
+ #include <linux/kernel.h>
+ #include <linux/module.h>
+ #include <linux/mm.h>
+ #include <linux/poll.h>
+ #include <linux/slab.h>
+ #include <linux/sched.h>
+ #include <linux/freezer.h>
+ #include <linux/kthread.h>
+
+ #include <media/videobuf2-core.h>
+ #include <media/v4l2-mc.h>
+
+ #include <trace/events/vb2.h>
+
+ static int debug;
+ module_param(debug, int, 0644);
+
+ #define dprintk(level, fmt, arg...) \
+ do { \
+ if (debug >= level) \
+ pr_info("%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
+
+ #define call_bufop(q, op, args...) \
+ ({ \
+ int ret = 0; \
+ if (q && q->buf_ops && q->buf_ops->op) \
+ ret = q->buf_ops->op(args); \
+ ret; \
+ })
+
+ #define call_void_bufop(q, op, args...) \
+ ({ \
+ if (q && q->buf_ops && q->buf_ops->op) \
+ q->buf_ops->op(args); \
+ })
+
+ static void __vb2_queue_cancel(struct vb2_queue *q);
+ static void __enqueue_in_driver(struct vb2_buffer *vb);
+
+ /*
+ * __vb2_buf_mem_alloc() - allocate video memory for the given buffer
+ */
+ static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
+ {
+ struct vb2_queue *q = vb->vb2_queue;
+ void *mem_priv;
+ int plane;
+ int ret = -ENOMEM;
+
+ /*
+ * Allocate memory for all planes in this buffer
+ * NOTE: mmapped areas should be page aligned
+ */
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ unsigned long size = PAGE_ALIGN(vb->planes[plane].length);
+
+ mem_priv = call_ptr_memop(vb, alloc,
+ q->alloc_devs[plane] ? : q->dev,
+ q->dma_attrs, size, q->dma_dir, q->gfp_flags);
+ if (IS_ERR_OR_NULL(mem_priv)) {
+ if (mem_priv)
+ ret = PTR_ERR(mem_priv);
+ goto free;
+ }
+
+ /* Associate allocator private data with this plane */
+ vb->planes[plane].mem_priv = mem_priv;
+ }
+
+ return 0;
+ free:
+ /* Free already allocated memory if one of the allocations failed */
+ for (; plane > 0; --plane) {
+ call_void_memop(vb, put, vb->planes[plane - 1].mem_priv);
+ vb->planes[plane - 1].mem_priv = NULL;
+ }
+
+ return ret;
+ }
+
+ /*
+ * __vb2_buf_mem_free() - free memory of the given buffer
+ */
+ static void __vb2_buf_mem_free(struct vb2_buffer *vb)
+ {
+ unsigned int plane;
+
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ call_void_memop(vb, put, vb->planes[plane].mem_priv);
+ vb->planes[plane].mem_priv = NULL;
+ dprintk(3, "freed plane %d of buffer %d\n", plane, vb->index);
+ }
+ }
+
+ /*
+ * __vb2_buf_userptr_put() - release userspace memory associated with
+ * a USERPTR buffer
+ */
+ static void __vb2_buf_userptr_put(struct vb2_buffer *vb)
+ {
+ unsigned int plane;
+
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ if (vb->planes[plane].mem_priv)
+ call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv);
+ vb->planes[plane].mem_priv = NULL;
+ }
+ }
+
+ /*
+ * __vb2_plane_dmabuf_put() - release memory associated with
+ * a DMABUF shared plane
+ */
+ static void __vb2_plane_dmabuf_put(struct vb2_buffer *vb, struct vb2_plane *p)
+ {
+ if (!p->mem_priv)
+ return;
+
+ if (p->dbuf_mapped)
+ call_void_memop(vb, unmap_dmabuf, p->mem_priv);
+
+ call_void_memop(vb, detach_dmabuf, p->mem_priv);
+ dma_buf_put(p->dbuf);
+ p->mem_priv = NULL;
+ p->dbuf = NULL;
+ p->dbuf_mapped = 0;
+ }
+
+ /*
+ * __vb2_buf_dmabuf_put() - release memory associated with
+ * a DMABUF shared buffer
+ */
+ static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb)
+ {
+ unsigned int plane;
+
+ for (plane = 0; plane < vb->num_planes; ++plane)
+ __vb2_plane_dmabuf_put(vb, &vb->planes[plane]);
+ }
+
+ /*
+ * __setup_offsets() - setup unique offsets ("cookies") for every plane in
+ * the buffer.
+ */
+ static void __setup_offsets(struct vb2_buffer *vb)
+ {
+ struct vb2_queue *q = vb->vb2_queue;
+ unsigned int plane;
+ unsigned long off = 0;
+
+ if (vb->index) {
+ struct vb2_buffer *prev = q->bufs[vb->index - 1];
+ struct vb2_plane *p = &prev->planes[prev->num_planes - 1];
+
+ off = PAGE_ALIGN(p->m.offset + p->length);
+ }
+
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ vb->planes[plane].m.offset = off;
+
+ dprintk(3, "buffer %d, plane %d offset 0x%08lx\n",
+ vb->index, plane, off);
+
+ off += vb->planes[plane].length;
+ off = PAGE_ALIGN(off);
+ }
+ }
+
+ /*
+ * __vb2_queue_alloc() - allocate videobuf buffer structures and (for MMAP type)
+ * video buffer memory for all buffers/planes on the queue and initializes the
+ * queue
+ *
+ * Returns the number of buffers successfully allocated.
+ */
+ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
+ unsigned int num_buffers, unsigned int num_planes,
+ const unsigned plane_sizes[VB2_MAX_PLANES])
+ {
+ unsigned int buffer, plane;
+ struct vb2_buffer *vb;
+ int ret;
+
+ /* Ensure that q->num_buffers+num_buffers is below VB2_MAX_FRAME */
+ num_buffers = min_t(unsigned int, num_buffers,
+ VB2_MAX_FRAME - q->num_buffers);
+
+ for (buffer = 0; buffer < num_buffers; ++buffer) {
+ /* Allocate videobuf buffer structures */
+ vb = kzalloc(q->buf_struct_size, GFP_KERNEL);
+ if (!vb) {
+ dprintk(1, "memory alloc for buffer struct failed\n");
+ break;
+ }
+
+ vb->state = VB2_BUF_STATE_DEQUEUED;
+ vb->vb2_queue = q;
+ vb->num_planes = num_planes;
+ vb->index = q->num_buffers + buffer;
+ vb->type = q->type;
+ vb->memory = memory;
+ for (plane = 0; plane < num_planes; ++plane) {
+ vb->planes[plane].length = plane_sizes[plane];
+ vb->planes[plane].min_length = plane_sizes[plane];
+ }
+ q->bufs[vb->index] = vb;
+
+ /* Allocate video buffer memory for the MMAP type */
+ if (memory == VB2_MEMORY_MMAP) {
+ ret = __vb2_buf_mem_alloc(vb);
+ if (ret) {
+ dprintk(1, "failed allocating memory for buffer %d\n",
+ buffer);
+ q->bufs[vb->index] = NULL;
+ kfree(vb);
+ break;
+ }
+ __setup_offsets(vb);
+ /*
+ * Call the driver-provided buffer initialization
+ * callback, if given. An error in initialization
+ * results in queue setup failure.
+ */
+ ret = call_vb_qop(vb, buf_init, vb);
+ if (ret) {
+ dprintk(1, "buffer %d %p initialization failed\n",
+ buffer, vb);
+ __vb2_buf_mem_free(vb);
+ q->bufs[vb->index] = NULL;
+ kfree(vb);
+ break;
+ }
+ }
+ }
+
+ dprintk(1, "allocated %d buffers, %d plane(s) each\n",
+ buffer, num_planes);
+
+ return buffer;
+ }
+
+ /*
+ * __vb2_free_mem() - release all video buffer memory for a given queue
+ */
+ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
+ {
+ unsigned int buffer;
+ struct vb2_buffer *vb;
+
+ for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
+ ++buffer) {
+ vb = q->bufs[buffer];
+ if (!vb)
+ continue;
+
+ /* Free MMAP buffers or release USERPTR buffers */
+ if (q->memory == VB2_MEMORY_MMAP)
+ __vb2_buf_mem_free(vb);
+ else if (q->memory == VB2_MEMORY_DMABUF)
+ __vb2_buf_dmabuf_put(vb);
+ else
+ __vb2_buf_userptr_put(vb);
+ }
+ }
+
+ /*
+ * __vb2_queue_free() - free buffers at the end of the queue - video memory and
+ * 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)
+ {
+ unsigned int buffer;
+
+ /*
+ * Sanity check: when preparing a buffer the queue lock is released for
+ * a short while (see __buf_prepare for the details), which would allow
+ * a race with a reqbufs which can call this function. Removing the
+ * buffers from underneath __buf_prepare is obviously a bad idea, so we
+ * check if any of the buffers is in the state PREPARING, and if so we
+ * just return -EAGAIN.
+ */
+ for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
+ ++buffer) {
+ if (q->bufs[buffer] == NULL)
+ continue;
+ if (q->bufs[buffer]->state == VB2_BUF_STATE_PREPARING) {
+ dprintk(1, "preparing buffers, cannot free\n");
+ return -EAGAIN;
+ }
+ }
+
+ /* Call driver-provided cleanup function for each buffer, if provided */
+ for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
+ ++buffer) {
+ struct vb2_buffer *vb = q->bufs[buffer];
+
+ if (vb && vb->planes[0].mem_priv)
+ call_void_vb_qop(vb, buf_cleanup, vb);
+ }
+
+ /* Release video buffer memory */
+ __vb2_free_mem(q, buffers);
+
+ #ifdef CONFIG_VIDEO_ADV_DEBUG
+ /*
+ * Check that all the calls were balances during the life-time of this
+ * queue. If not (or if the debug level is 1 or up), then dump the
+ * counters to the kernel log.
+ */
+ if (q->num_buffers) {
+ bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming ||
+ q->cnt_wait_prepare != q->cnt_wait_finish;
+
+ if (unbalanced || debug) {
+ pr_info("counters for queue %p:%s\n", q,
+ unbalanced ? " UNBALANCED!" : "");
+ pr_info(" setup: %u start_streaming: %u stop_streaming: %u\n",
+ q->cnt_queue_setup, q->cnt_start_streaming,
+ q->cnt_stop_streaming);
+ pr_info(" wait_prepare: %u wait_finish: %u\n",
+ q->cnt_wait_prepare, q->cnt_wait_finish);
+ }
+ q->cnt_queue_setup = 0;
+ q->cnt_wait_prepare = 0;
+ q->cnt_wait_finish = 0;
+ q->cnt_start_streaming = 0;
+ q->cnt_stop_streaming = 0;
+ }
+ for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ struct vb2_buffer *vb = q->bufs[buffer];
+ bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put ||
+ vb->cnt_mem_prepare != vb->cnt_mem_finish ||
+ vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr ||
+ vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf ||
+ vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf ||
+ vb->cnt_buf_queue != vb->cnt_buf_done ||
+ vb->cnt_buf_prepare != vb->cnt_buf_finish ||
+ vb->cnt_buf_init != vb->cnt_buf_cleanup;
+
+ if (unbalanced || debug) {
+ pr_info(" counters for queue %p, buffer %d:%s\n",
+ q, buffer, unbalanced ? " UNBALANCED!" : "");
+ pr_info(" buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n",
+ vb->cnt_buf_init, vb->cnt_buf_cleanup,
+ vb->cnt_buf_prepare, vb->cnt_buf_finish);
+ pr_info(" buf_queue: %u buf_done: %u\n",
+ vb->cnt_buf_queue, vb->cnt_buf_done);
+ pr_info(" alloc: %u put: %u prepare: %u finish: %u mmap: %u\n",
+ vb->cnt_mem_alloc, vb->cnt_mem_put,
+ vb->cnt_mem_prepare, vb->cnt_mem_finish,
+ vb->cnt_mem_mmap);
+ pr_info(" get_userptr: %u put_userptr: %u\n",
+ vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr);
+ pr_info(" attach_dmabuf: %u detach_dmabuf: %u map_dmabuf: %u unmap_dmabuf: %u\n",
+ vb->cnt_mem_attach_dmabuf, vb->cnt_mem_detach_dmabuf,
+ vb->cnt_mem_map_dmabuf, vb->cnt_mem_unmap_dmabuf);
+ pr_info(" get_dmabuf: %u num_users: %u vaddr: %u cookie: %u\n",
+ vb->cnt_mem_get_dmabuf,
+ vb->cnt_mem_num_users,
+ vb->cnt_mem_vaddr,
+ vb->cnt_mem_cookie);
+ }
+ }
+ #endif
+
+ /* Free videobuf buffers */
+ for (buffer = q->num_buffers - buffers; buffer < q->num_buffers;
+ ++buffer) {
+ kfree(q->bufs[buffer]);
+ q->bufs[buffer] = NULL;
+ }
+
+ q->num_buffers -= buffers;
+ if (!q->num_buffers) {
+ q->memory = VB2_MEMORY_UNKNOWN;
+ INIT_LIST_HEAD(&q->queued_list);
+ }
+ return 0;
+ }
+
+ bool vb2_buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb)
+ {
+ unsigned int plane;
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ void *mem_priv = vb->planes[plane].mem_priv;
+ /*
+ * If num_users() has not been provided, call_memop
+ * will return 0, apparently nobody cares about this
+ * case anyway. If num_users() returns more than 1,
+ * we are not the only user of the plane's memory.
+ */
+ if (mem_priv && call_memop(vb, num_users, mem_priv) > 1)
+ return true;
+ }
+ return false;
+ }
+ EXPORT_SYMBOL(vb2_buffer_in_use);
+
+ /*
+ * __buffers_in_use() - return true if any buffers on the queue are in use and
+ * the queue cannot be freed (by the means of REQBUFS(0)) call
+ */
+ static bool __buffers_in_use(struct vb2_queue *q)
+ {
+ unsigned int buffer;
+ for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ if (vb2_buffer_in_use(q, q->bufs[buffer]))
+ return true;
+ }
+ return false;
+ }
+
+ void vb2_core_querybuf(struct vb2_queue *q, unsigned int index, void *pb)
+ {
+ call_void_bufop(q, fill_user_buffer, q->bufs[index], pb);
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_querybuf);
+
+ /*
+ * __verify_userptr_ops() - verify that all memory operations required for
+ * USERPTR queue type have been provided
+ */
+ static int __verify_userptr_ops(struct vb2_queue *q)
+ {
+ if (!(q->io_modes & VB2_USERPTR) || !q->mem_ops->get_userptr ||
+ !q->mem_ops->put_userptr)
+ return -EINVAL;
+
+ return 0;
+ }
+
+ /*
+ * __verify_mmap_ops() - verify that all memory operations required for
+ * MMAP queue type have been provided
+ */
+ static int __verify_mmap_ops(struct vb2_queue *q)
+ {
+ if (!(q->io_modes & VB2_MMAP) || !q->mem_ops->alloc ||
+ !q->mem_ops->put || !q->mem_ops->mmap)
+ return -EINVAL;
+
+ return 0;
+ }
+
+ /*
+ * __verify_dmabuf_ops() - verify that all memory operations required for
+ * DMABUF queue type have been provided
+ */
+ static int __verify_dmabuf_ops(struct vb2_queue *q)
+ {
+ if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf ||
+ !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf ||
+ !q->mem_ops->unmap_dmabuf)
+ return -EINVAL;
+
+ return 0;
+ }
+
+ int vb2_verify_memory_type(struct vb2_queue *q,
+ enum vb2_memory memory, unsigned int type)
+ {
+ if (memory != VB2_MEMORY_MMAP && memory != VB2_MEMORY_USERPTR &&
+ memory != VB2_MEMORY_DMABUF) {
+ dprintk(1, "unsupported memory type\n");
+ return -EINVAL;
+ }
+
+ if (type != q->type) {
+ dprintk(1, "requested type is incorrect\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Make sure all the required memory ops for given memory type
+ * are available.
+ */
+ if (memory == VB2_MEMORY_MMAP && __verify_mmap_ops(q)) {
+ dprintk(1, "MMAP for current setup unsupported\n");
+ return -EINVAL;
+ }
+
+ if (memory == VB2_MEMORY_USERPTR && __verify_userptr_ops(q)) {
+ dprintk(1, "USERPTR for current setup unsupported\n");
+ return -EINVAL;
+ }
+
+ if (memory == VB2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) {
+ dprintk(1, "DMABUF for current setup unsupported\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Place the busy tests at the end: -EBUSY can be ignored when
+ * create_bufs is called with count == 0, but count == 0 should still
+ * do the memory and type validation.
+ */
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "file io in progress\n");
+ return -EBUSY;
+ }
+ return 0;
+ }
+ EXPORT_SYMBOL(vb2_verify_memory_type);
+
+ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
+ unsigned int *count)
+ {
+ unsigned int num_buffers, allocated_buffers, num_planes = 0;
+ unsigned plane_sizes[VB2_MAX_PLANES] = { };
+ int ret;
+
+ if (q->streaming) {
+ dprintk(1, "streaming active\n");
+ return -EBUSY;
+ }
+
+ if (*count == 0 || q->num_buffers != 0 ||
+ (q->memory != VB2_MEMORY_UNKNOWN && q->memory != memory)) {
+ /*
+ * We already have buffers allocated, so first check if they
+ * are not in use and can be freed.
+ */
+ mutex_lock(&q->mmap_lock);
+ if (q->memory == VB2_MEMORY_MMAP && __buffers_in_use(q)) {
+ mutex_unlock(&q->mmap_lock);
+ dprintk(1, "memory in use, cannot free\n");
+ return -EBUSY;
+ }
+
+ /*
+ * Call queue_cancel to clean up any buffers in the PREPARED or
+ * QUEUED state which is possible if buffers were prepared or
+ * queued without ever calling STREAMON.
+ */
+ __vb2_queue_cancel(q);
+ ret = __vb2_queue_free(q, q->num_buffers);
+ mutex_unlock(&q->mmap_lock);
+ if (ret)
+ return ret;
+
+ /*
+ * In case of REQBUFS(0) return immediately without calling
+ * driver's queue_setup() callback and allocating resources.
+ */
+ if (*count == 0)
+ return 0;
+ }
+
+ /*
+ * Make sure the requested values and current defaults are sane.
+ */
+ WARN_ON(q->min_buffers_needed > VB2_MAX_FRAME);
+ num_buffers = max_t(unsigned int, *count, q->min_buffers_needed);
+ num_buffers = min_t(unsigned int, num_buffers, VB2_MAX_FRAME);
+ memset(q->alloc_devs, 0, sizeof(q->alloc_devs));
+ q->memory = memory;
+
+ /*
+ * Ask the driver how many buffers and planes per buffer it requires.
+ * Driver also sets the size and allocator context for each plane.
+ */
+ ret = call_qop(q, queue_setup, q, &num_buffers, &num_planes,
+ plane_sizes, q->alloc_devs);
+ if (ret)
+ return ret;
+
+ /* Finally, allocate buffers and video memory */
+ allocated_buffers =
+ __vb2_queue_alloc(q, memory, num_buffers, num_planes, plane_sizes);
+ if (allocated_buffers == 0) {
+ dprintk(1, "memory allocation failed\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * There is no point in continuing if we can't allocate the minimum
+ * number of buffers needed by this vb2_queue.
+ */
+ if (allocated_buffers < q->min_buffers_needed)
+ ret = -ENOMEM;
+
+ /*
+ * Check if driver can handle the allocated number of buffers.
+ */
+ if (!ret && allocated_buffers < num_buffers) {
+ num_buffers = allocated_buffers;
+ /*
+ * num_planes is set by the previous queue_setup(), but since it
+ * signals to queue_setup() whether it is called from create_bufs()
+ * vs reqbufs() we zero it here to signal that queue_setup() is
+ * called for the reqbufs() case.
+ */
+ num_planes = 0;
+
+ ret = call_qop(q, queue_setup, q, &num_buffers,
+ &num_planes, plane_sizes, q->alloc_devs);
+
+ if (!ret && allocated_buffers < num_buffers)
+ ret = -ENOMEM;
+
+ /*
+ * Either the driver has accepted a smaller number of buffers,
+ * or .queue_setup() returned an error
+ */
+ }
+
+ mutex_lock(&q->mmap_lock);
+ q->num_buffers = allocated_buffers;
+
+ if (ret < 0) {
+ /*
+ * Note: __vb2_queue_free() will subtract 'allocated_buffers'
+ * from q->num_buffers.
+ */
+ __vb2_queue_free(q, allocated_buffers);
+ mutex_unlock(&q->mmap_lock);
+ return ret;
+ }
+ mutex_unlock(&q->mmap_lock);
+
+ /*
+ * Return the number of successfully allocated buffers
+ * to the userspace.
+ */
+ *count = allocated_buffers;
+ q->waiting_for_buffers = !q->is_output;
+
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_reqbufs);
+
+ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
+ unsigned int *count, unsigned requested_planes,
+ const unsigned requested_sizes[])
+ {
+ unsigned int num_planes = 0, num_buffers, allocated_buffers;
+ unsigned plane_sizes[VB2_MAX_PLANES] = { };
+ int ret;
+
+ if (q->num_buffers == VB2_MAX_FRAME) {
+ dprintk(1, "maximum number of buffers already allocated\n");
+ return -ENOBUFS;
+ }
+
+ if (!q->num_buffers) {
+ memset(q->alloc_devs, 0, sizeof(q->alloc_devs));
+ q->memory = memory;
+ q->waiting_for_buffers = !q->is_output;
+ }
+
+ num_buffers = min(*count, VB2_MAX_FRAME - q->num_buffers);
+
+ if (requested_planes && requested_sizes) {
+ num_planes = requested_planes;
+ memcpy(plane_sizes, requested_sizes, sizeof(plane_sizes));
+ }
+
+ /*
+ * Ask the driver, whether the requested number of buffers, planes per
+ * buffer and their sizes are acceptable
+ */
+ ret = call_qop(q, queue_setup, q, &num_buffers,
+ &num_planes, plane_sizes, q->alloc_devs);
+ if (ret)
+ return ret;
+
+ /* Finally, allocate buffers and video memory */
+ allocated_buffers = __vb2_queue_alloc(q, memory, num_buffers,
+ num_planes, plane_sizes);
+ if (allocated_buffers == 0) {
+ dprintk(1, "memory allocation failed\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Check if driver can handle the so far allocated number of buffers.
+ */
+ if (allocated_buffers < num_buffers) {
+ num_buffers = allocated_buffers;
+
+ /*
+ * q->num_buffers contains the total number of buffers, that the
+ * queue driver has set up
+ */
+ ret = call_qop(q, queue_setup, q, &num_buffers,
+ &num_planes, plane_sizes, q->alloc_devs);
+
+ if (!ret && allocated_buffers < num_buffers)
+ ret = -ENOMEM;
+
+ /*
+ * Either the driver has accepted a smaller number of buffers,
+ * or .queue_setup() returned an error
+ */
+ }
+
+ mutex_lock(&q->mmap_lock);
+ q->num_buffers += allocated_buffers;
+
+ if (ret < 0) {
+ /*
+ * Note: __vb2_queue_free() will subtract 'allocated_buffers'
+ * from q->num_buffers.
+ */
+ __vb2_queue_free(q, allocated_buffers);
+ mutex_unlock(&q->mmap_lock);
+ return -ENOMEM;
+ }
+ mutex_unlock(&q->mmap_lock);
+
+ /*
+ * Return the number of successfully allocated buffers
+ * to the userspace.
+ */
+ *count = allocated_buffers;
+
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_create_bufs);
+
+ void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no)
+ {
+ if (plane_no >= vb->num_planes || !vb->planes[plane_no].mem_priv)
+ return NULL;
+
+ return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv);
+
+ }
+ EXPORT_SYMBOL_GPL(vb2_plane_vaddr);
+
+ void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no)
+ {
+ if (plane_no >= vb->num_planes || !vb->planes[plane_no].mem_priv)
+ return NULL;
+
+ return call_ptr_memop(vb, cookie, vb->planes[plane_no].mem_priv);
+ }
+ EXPORT_SYMBOL_GPL(vb2_plane_cookie);
+
+ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
+ {
+ struct vb2_queue *q = vb->vb2_queue;
+ unsigned long flags;
+ unsigned int plane;
+
+ if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE))
+ return;
+
+ if (WARN_ON(state != VB2_BUF_STATE_DONE &&
+ state != VB2_BUF_STATE_ERROR &&
+ state != VB2_BUF_STATE_QUEUED &&
+ state != VB2_BUF_STATE_REQUEUEING))
+ state = VB2_BUF_STATE_ERROR;
+
+ #ifdef CONFIG_VIDEO_ADV_DEBUG
+ /*
+ * Although this is not a callback, it still does have to balance
+ * with the buf_queue op. So update this counter manually.
+ */
+ vb->cnt_buf_done++;
+ #endif
+ dprintk(4, "done processing on buffer %d, state: %d\n",
+ vb->index, state);
+
+ /* sync buffers */
+ for (plane = 0; plane < vb->num_planes; ++plane)
+ call_void_memop(vb, finish, vb->planes[plane].mem_priv);
+
+ spin_lock_irqsave(&q->done_lock, flags);
+ if (state == VB2_BUF_STATE_QUEUED ||
+ state == VB2_BUF_STATE_REQUEUEING) {
+ vb->state = VB2_BUF_STATE_QUEUED;
+ } else {
+ /* Add the buffer to the done buffers list */
+ list_add_tail(&vb->done_entry, &q->done_list);
+ vb->state = state;
+ }
+ atomic_dec(&q->owned_by_drv_count);
+ spin_unlock_irqrestore(&q->done_lock, flags);
+
+ trace_vb2_buf_done(q, vb);
+
+ switch (state) {
+ case VB2_BUF_STATE_QUEUED:
+ return;
+ case VB2_BUF_STATE_REQUEUEING:
+ if (q->start_streaming_called)
+ __enqueue_in_driver(vb);
+ return;
+ default:
+ /* Inform any processes that may be waiting for buffers */
+ wake_up(&q->done_wq);
+ break;
+ }
+ }
+ EXPORT_SYMBOL_GPL(vb2_buffer_done);
+
+ void vb2_discard_done(struct vb2_queue *q)
+ {
+ struct vb2_buffer *vb;
+ unsigned long flags;
+
+ spin_lock_irqsave(&q->done_lock, flags);
+ list_for_each_entry(vb, &q->done_list, done_entry)
+ vb->state = VB2_BUF_STATE_ERROR;
+ spin_unlock_irqrestore(&q->done_lock, flags);
+ }
+ EXPORT_SYMBOL_GPL(vb2_discard_done);
+
+ /*
+ * __prepare_mmap() - prepare an MMAP buffer
+ */
+ static int __prepare_mmap(struct vb2_buffer *vb, const void *pb)
+ {
+ int ret = 0;
+
+ if (pb)
+ ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
+ vb, pb, vb->planes);
+ return ret ? ret : call_vb_qop(vb, buf_prepare, vb);
+ }
+
+ /*
+ * __prepare_userptr() - prepare a USERPTR buffer
+ */
+ static int __prepare_userptr(struct vb2_buffer *vb, const void *pb)
+ {
+ struct vb2_plane planes[VB2_MAX_PLANES];
+ struct vb2_queue *q = vb->vb2_queue;
+ void *mem_priv;
+ unsigned int plane;
+ int ret = 0;
+ bool reacquired = vb->planes[0].mem_priv == NULL;
+
+ memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
+ /* Copy relevant information provided by the userspace */
+ if (pb) {
+ ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
+ vb, pb, planes);
+ if (ret)
+ return ret;
+ }
+
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ /* Skip the plane if already verified */
+ if (vb->planes[plane].m.userptr &&
+ vb->planes[plane].m.userptr == planes[plane].m.userptr
+ && vb->planes[plane].length == planes[plane].length)
+ continue;
+
+ dprintk(3, "userspace address for plane %d changed, reacquiring memory\n",
+ plane);
+
+ /* Check if the provided plane buffer is large enough */
+ if (planes[plane].length < vb->planes[plane].min_length) {
+ dprintk(1, "provided buffer size %u is less than setup size %u for plane %d\n",
+ planes[plane].length,
+ vb->planes[plane].min_length,
+ plane);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ /* Release previously acquired memory if present */
+ if (vb->planes[plane].mem_priv) {
+ if (!reacquired) {
+ reacquired = true;
+ call_void_vb_qop(vb, buf_cleanup, vb);
+ }
+ call_void_memop(vb, put_userptr, vb->planes[plane].mem_priv);
+ }
+
+ vb->planes[plane].mem_priv = NULL;
+ vb->planes[plane].bytesused = 0;
+ vb->planes[plane].length = 0;
+ vb->planes[plane].m.userptr = 0;
+ vb->planes[plane].data_offset = 0;
+
+ /* Acquire each plane's memory */
+ mem_priv = call_ptr_memop(vb, get_userptr,
+ q->alloc_devs[plane] ? : q->dev,
+ planes[plane].m.userptr,
+ planes[plane].length, q->dma_dir);
+ if (IS_ERR(mem_priv)) {
+ dprintk(1, "failed acquiring userspace memory for plane %d\n",
+ plane);
+ ret = PTR_ERR(mem_priv);
+ goto err;
+ }
+ vb->planes[plane].mem_priv = mem_priv;
+ }
+
+ /*
+ * Now that everything is in order, copy relevant information
+ * provided by userspace.
+ */
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ vb->planes[plane].bytesused = planes[plane].bytesused;
+ vb->planes[plane].length = planes[plane].length;
+ vb->planes[plane].m.userptr = planes[plane].m.userptr;
+ vb->planes[plane].data_offset = planes[plane].data_offset;
+ }
+
+ if (reacquired) {
+ /*
+ * One or more planes changed, so we must call buf_init to do
+ * the driver-specific initialization on the newly acquired
+ * buffer, if provided.
+ */
+ ret = call_vb_qop(vb, buf_init, vb);
+ if (ret) {
+ dprintk(1, "buffer initialization failed\n");
+ goto err;
+ }
+ }
+
+ ret = call_vb_qop(vb, buf_prepare, vb);
+ if (ret) {
+ dprintk(1, "buffer preparation failed\n");
+ call_void_vb_qop(vb, buf_cleanup, vb);
+ goto err;
+ }
+
+ return 0;
+ err:
+ /* In case of errors, release planes that were already acquired */
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ if (vb->planes[plane].mem_priv)
+ call_void_memop(vb, put_userptr,
+ vb->planes[plane].mem_priv);
+ vb->planes[plane].mem_priv = NULL;
+ vb->planes[plane].m.userptr = 0;
+ vb->planes[plane].length = 0;
+ }
+
+ return ret;
+ }
+
+ /*
+ * __prepare_dmabuf() - prepare a DMABUF buffer
+ */
+ static int __prepare_dmabuf(struct vb2_buffer *vb, const void *pb)
+ {
+ struct vb2_plane planes[VB2_MAX_PLANES];
+ struct vb2_queue *q = vb->vb2_queue;
+ void *mem_priv;
+ unsigned int plane;
+ int ret = 0;
+ bool reacquired = vb->planes[0].mem_priv == NULL;
+
+ memset(planes, 0, sizeof(planes[0]) * vb->num_planes);
+ /* Copy relevant information provided by the userspace */
+ if (pb) {
+ ret = call_bufop(vb->vb2_queue, fill_vb2_buffer,
+ vb, pb, planes);
+ if (ret)
+ return ret;
+ }
+
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd);
+
+ if (IS_ERR_OR_NULL(dbuf)) {
+ dprintk(1, "invalid dmabuf fd for plane %d\n",
+ plane);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ /* use DMABUF size if length is not provided */
+ if (planes[plane].length == 0)
+ planes[plane].length = dbuf->size;
+
+ if (planes[plane].length < vb->planes[plane].min_length) {
+ dprintk(1, "invalid dmabuf length %u for plane %d, minimum length %u\n",
+ planes[plane].length, plane,
+ vb->planes[plane].min_length);
+ dma_buf_put(dbuf);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ /* Skip the plane if already verified */
+ if (dbuf == vb->planes[plane].dbuf &&
+ vb->planes[plane].length == planes[plane].length) {
+ dma_buf_put(dbuf);
+ continue;
+ }
+
+ dprintk(3, "buffer for plane %d changed\n", plane);
+
+ if (!reacquired) {
+ reacquired = true;
+ call_void_vb_qop(vb, buf_cleanup, vb);
+ }
+
+ /* Release previously acquired memory if present */
+ __vb2_plane_dmabuf_put(vb, &vb->planes[plane]);
+ vb->planes[plane].bytesused = 0;
+ vb->planes[plane].length = 0;
+ vb->planes[plane].m.fd = 0;
+ vb->planes[plane].data_offset = 0;
+
+ /* Acquire each plane's memory */
+ mem_priv = call_ptr_memop(vb, attach_dmabuf,
+ q->alloc_devs[plane] ? : q->dev,
+ dbuf, planes[plane].length, q->dma_dir);
+ if (IS_ERR(mem_priv)) {
+ dprintk(1, "failed to attach dmabuf\n");
+ ret = PTR_ERR(mem_priv);
+ dma_buf_put(dbuf);
+ goto err;
+ }
+
+ vb->planes[plane].dbuf = dbuf;
+ vb->planes[plane].mem_priv = mem_priv;
+ }
+
+ /*
+ * This pins the buffer(s) with dma_buf_map_attachment()). It's done
+ * here instead just before the DMA, while queueing the buffer(s) so
+ * userspace knows sooner rather than later if the dma-buf map fails.
+ */
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ ret = call_memop(vb, map_dmabuf, vb->planes[plane].mem_priv);
+ if (ret) {
+ dprintk(1, "failed to map dmabuf for plane %d\n",
+ plane);
+ goto err;
+ }
+ vb->planes[plane].dbuf_mapped = 1;
+ }
+
+ /*
+ * Now that everything is in order, copy relevant information
+ * provided by userspace.
+ */
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ vb->planes[plane].bytesused = planes[plane].bytesused;
+ vb->planes[plane].length = planes[plane].length;
+ vb->planes[plane].m.fd = planes[plane].m.fd;
+ vb->planes[plane].data_offset = planes[plane].data_offset;
+ }
+
+ if (reacquired) {
+ /*
+ * Call driver-specific initialization on the newly acquired buffer,
+ * if provided.
+ */
+ ret = call_vb_qop(vb, buf_init, vb);
+ if (ret) {
+ dprintk(1, "buffer initialization failed\n");
+ goto err;
+ }
+ }
+
+ ret = call_vb_qop(vb, buf_prepare, vb);
+ if (ret) {
+ dprintk(1, "buffer preparation failed\n");
+ call_void_vb_qop(vb, buf_cleanup, vb);
+ goto err;
+ }
+
+ return 0;
+ err:
+ /* In case of errors, release planes that were already acquired */
+ __vb2_buf_dmabuf_put(vb);
+
+ return ret;
+ }
+
+ /*
+ * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing
+ */
+ static void __enqueue_in_driver(struct vb2_buffer *vb)
+ {
+ struct vb2_queue *q = vb->vb2_queue;
+
+ vb->state = VB2_BUF_STATE_ACTIVE;
+ atomic_inc(&q->owned_by_drv_count);
+
+ trace_vb2_buf_queue(q, vb);
+
+ call_void_vb_qop(vb, buf_queue, vb);
+ }
+
+ static int __buf_prepare(struct vb2_buffer *vb, const void *pb)
+ {
+ struct vb2_queue *q = vb->vb2_queue;
+ unsigned int plane;
+ int ret;
+
+ if (q->error) {
+ dprintk(1, "fatal error occurred on queue\n");
+ return -EIO;
+ }
+
+ vb->state = VB2_BUF_STATE_PREPARING;
+
+ switch (q->memory) {
+ case VB2_MEMORY_MMAP:
+ ret = __prepare_mmap(vb, pb);
+ break;
+ case VB2_MEMORY_USERPTR:
+ ret = __prepare_userptr(vb, pb);
+ break;
+ case VB2_MEMORY_DMABUF:
+ ret = __prepare_dmabuf(vb, pb);
+ break;
+ default:
+ WARN(1, "Invalid queue type\n");
+ ret = -EINVAL;
+ }
+
+ if (ret) {
+ dprintk(1, "buffer preparation failed: %d\n", ret);
+ vb->state = VB2_BUF_STATE_DEQUEUED;
+ return ret;
+ }
+
+ /* sync buffers */
+ for (plane = 0; plane < vb->num_planes; ++plane)
+ call_void_memop(vb, prepare, vb->planes[plane].mem_priv);
+
+ vb->state = VB2_BUF_STATE_PREPARED;
+
+ return 0;
+ }
+
+ int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
+ {
+ struct vb2_buffer *vb;
+ int ret;
+
+ vb = q->bufs[index];
+ if (vb->state != VB2_BUF_STATE_DEQUEUED) {
+ dprintk(1, "invalid buffer state %d\n",
+ vb->state);
+ return -EINVAL;
+ }
+
+ ret = __buf_prepare(vb, pb);
+ if (ret)
+ return ret;
+
+ /* Fill buffer information for the userspace */
+ call_void_bufop(q, fill_user_buffer, vb, pb);
+
+ dprintk(2, "prepare of buffer %d succeeded\n", vb->index);
+
+ return ret;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_prepare_buf);
+
+ /*
+ * vb2_start_streaming() - Attempt to start streaming.
+ * @q: videobuf2 queue
+ *
+ * Attempt to start streaming. When this function is called there must be
+ * at least q->min_buffers_needed buffers queued up (i.e. the minimum
+ * number of buffers required for the DMA engine to function). If the
+ * @start_streaming op fails it is supposed to return all the driver-owned
+ * buffers back to vb2 in state QUEUED. Check if that happened and if
+ * not warn and reclaim them forcefully.
+ */
+ static int vb2_start_streaming(struct vb2_queue *q)
+ {
+ struct vb2_buffer *vb;
+ int ret;
+
+ /*
+ * If any buffers were queued before streamon,
+ * we can now pass them to driver for processing.
+ */
+ list_for_each_entry(vb, &q->queued_list, queued_entry)
+ __enqueue_in_driver(vb);
+
+ /* Tell the driver to start streaming */
+ q->start_streaming_called = 1;
+ ret = call_qop(q, start_streaming, q,
+ atomic_read(&q->owned_by_drv_count));
+ if (!ret)
+ return 0;
+
+ q->start_streaming_called = 0;
+
+ dprintk(1, "driver refused to start streaming\n");
+ /*
+ * If you see this warning, then the driver isn't cleaning up properly
+ * after a failed start_streaming(). See the start_streaming()
+ * documentation in videobuf2-core.h for more information how buffers
+ * should be returned to vb2 in start_streaming().
+ */
+ if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
+ unsigned i;
+
+ /*
+ * Forcefully reclaim buffers if the driver did not
+ * correctly return them to vb2.
+ */
+ for (i = 0; i < q->num_buffers; ++i) {
+ vb = q->bufs[i];
+ if (vb->state == VB2_BUF_STATE_ACTIVE)
+ vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED);
+ }
+ /* Must be zero now */
+ WARN_ON(atomic_read(&q->owned_by_drv_count));
+ }
+ /*
+ * If done_list is not empty, then start_streaming() didn't call
+ * vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED) but STATE_ERROR or
+ * STATE_DONE.
+ */
+ WARN_ON(!list_empty(&q->done_list));
+ return ret;
+ }
+
+ int vb2_core_qbuf(struct vb2_queue *q, unsigned int index, void *pb)
+ {
+ struct vb2_buffer *vb;
+ int ret;
+
+ vb = q->bufs[index];
+
+ switch (vb->state) {
+ case VB2_BUF_STATE_DEQUEUED:
+ ret = __buf_prepare(vb, pb);
+ if (ret)
+ return ret;
+ break;
+ case VB2_BUF_STATE_PREPARED:
+ break;
+ case VB2_BUF_STATE_PREPARING:
+ dprintk(1, "buffer still being prepared\n");
+ return -EINVAL;
+ default:
+ dprintk(1, "invalid buffer state %d\n", vb->state);
+ return -EINVAL;
+ }
+
+ /*
+ * Add to the queued buffers list, a buffer will stay on it until
+ * dequeued in dqbuf.
+ */
+ list_add_tail(&vb->queued_entry, &q->queued_list);
+ q->queued_count++;
+ q->waiting_for_buffers = false;
+ vb->state = VB2_BUF_STATE_QUEUED;
+
+ if (pb)
+ call_void_bufop(q, copy_timestamp, vb, pb);
+
+ trace_vb2_qbuf(q, vb);
+
+ /*
+ * If already streaming, give the buffer to driver for processing.
+ * If not, the buffer will be given to driver on next streamon.
+ */
+ if (q->start_streaming_called)
+ __enqueue_in_driver(vb);
+
+ /* Fill buffer information for the userspace */
+ if (pb)
+ call_void_bufop(q, fill_user_buffer, vb, pb);
+
+ /*
+ * If streamon has been called, and we haven't yet called
+ * start_streaming() since not enough buffers were queued, and
+ * we now have reached the minimum number of queued buffers,
+ * then we can finally call start_streaming().
+ */
+ if (q->streaming && !q->start_streaming_called &&
+ q->queued_count >= q->min_buffers_needed) {
+ ret = vb2_start_streaming(q);
+ if (ret)
+ return ret;
+ }
+
+ dprintk(2, "qbuf of buffer %d succeeded\n", vb->index);
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_qbuf);
+
+ /*
+ * __vb2_wait_for_done_vb() - wait for a buffer to become available
+ * for dequeuing
+ *
+ * Will sleep if required for nonblocking == false.
+ */
+ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
+ {
+ /*
+ * All operations on vb_done_list are performed under done_lock
+ * spinlock protection. However, buffers may be removed from
+ * it and returned to userspace only while holding both driver's
+ * lock and the done_lock spinlock. Thus we can be sure that as
+ * long as we hold the driver's lock, the list will remain not
+ * empty if list_empty() check succeeds.
+ */
+
+ for (;;) {
+ int ret;
+
+ if (!q->streaming) {
+ dprintk(1, "streaming off, will not wait for buffers\n");
+ return -EINVAL;
+ }
+
+ if (q->error) {
+ dprintk(1, "Queue in error state, will not wait for buffers\n");
+ return -EIO;
+ }
+
+ if (q->last_buffer_dequeued) {
+ dprintk(3, "last buffer dequeued already, will not wait for buffers\n");
+ return -EPIPE;
+ }
+
+ if (!list_empty(&q->done_list)) {
+ /*
+ * Found a buffer that we were waiting for.
+ */
+ break;
+ }
+
+ if (nonblocking) {
+ dprintk(3, "nonblocking and no buffers to dequeue, will not wait\n");
+ return -EAGAIN;
+ }
+
+ /*
+ * We are streaming and blocking, wait for another buffer to
+ * become ready or for streamoff. Driver's lock is released to
+ * allow streamoff or qbuf to be called while waiting.
+ */
+ call_void_qop(q, wait_prepare, q);
+
+ /*
+ * All locks have been released, it is safe to sleep now.
+ */
+ dprintk(3, "will sleep waiting for buffers\n");
+ ret = wait_event_interruptible(q->done_wq,
+ !list_empty(&q->done_list) || !q->streaming ||
+ q->error);
+
+ /*
+ * We need to reevaluate both conditions again after reacquiring
+ * the locks or return an error if one occurred.
+ */
+ call_void_qop(q, wait_finish, q);
+ if (ret) {
+ dprintk(1, "sleep was interrupted\n");
+ return ret;
+ }
+ }
+ return 0;
+ }
+
+ /*
+ * __vb2_get_done_vb() - get a buffer ready for dequeuing
+ *
+ * Will sleep if required for nonblocking == false.
+ */
+ static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb,
+ void *pb, int nonblocking)
+ {
+ unsigned long flags;
+ int ret = 0;
+
+ /*
+ * Wait for at least one buffer to become available on the done_list.
+ */
+ ret = __vb2_wait_for_done_vb(q, nonblocking);
+ if (ret)
+ return ret;
+
+ /*
+ * Driver's lock has been held since we last verified that done_list
+ * is not empty, so no need for another list_empty(done_list) check.
+ */
+ spin_lock_irqsave(&q->done_lock, flags);
+ *vb = list_first_entry(&q->done_list, struct vb2_buffer, done_entry);
+ /*
+ * Only remove the buffer from done_list if all planes can be
+ * handled. Some cases such as V4L2 file I/O and DVB have pb
+ * == NULL; skip the check then as there's nothing to verify.
+ */
+ if (pb)
+ ret = call_bufop(q, verify_planes_array, *vb, pb);
+ if (!ret)
+ list_del(&(*vb)->done_entry);
+ spin_unlock_irqrestore(&q->done_lock, flags);
+
+ return ret;
+ }
+
+ int vb2_wait_for_all_buffers(struct vb2_queue *q)
+ {
+ if (!q->streaming) {
+ dprintk(1, "streaming off, will not wait for buffers\n");
+ return -EINVAL;
+ }
+
+ if (q->start_streaming_called)
+ wait_event(q->done_wq, !atomic_read(&q->owned_by_drv_count));
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers);
+
+ /*
+ * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state
+ */
+ static void __vb2_dqbuf(struct vb2_buffer *vb)
+ {
+ struct vb2_queue *q = vb->vb2_queue;
+ unsigned int i;
+
+ /* nothing to do if the buffer is already dequeued */
+ if (vb->state == VB2_BUF_STATE_DEQUEUED)
+ return;
+
+ vb->state = VB2_BUF_STATE_DEQUEUED;
+
+ /* unmap DMABUF buffer */
+ if (q->memory == VB2_MEMORY_DMABUF)
+ for (i = 0; i < vb->num_planes; ++i) {
+ if (!vb->planes[i].dbuf_mapped)
+ continue;
+ call_void_memop(vb, unmap_dmabuf, vb->planes[i].mem_priv);
+ vb->planes[i].dbuf_mapped = 0;
+ }
+ }
+
+ int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
+ bool nonblocking)
+ {
+ struct vb2_buffer *vb = NULL;
+ int ret;
+
+ ret = __vb2_get_done_vb(q, &vb, pb, nonblocking);
+ if (ret < 0)
+ return ret;
+
+ switch (vb->state) {
+ case VB2_BUF_STATE_DONE:
+ dprintk(3, "returning done buffer\n");
+ break;
+ case VB2_BUF_STATE_ERROR:
+ dprintk(3, "returning done buffer with errors\n");
+ break;
+ default:
+ dprintk(1, "invalid buffer state\n");
+ return -EINVAL;
+ }
+
+ call_void_vb_qop(vb, buf_finish, vb);
+
+ if (pindex)
+ *pindex = vb->index;
+
+ /* Fill buffer information for the userspace */
+ if (pb)
+ call_void_bufop(q, fill_user_buffer, vb, pb);
+
+ /* Remove from videobuf queue */
+ list_del(&vb->queued_entry);
+ q->queued_count--;
+
+ trace_vb2_dqbuf(q, vb);
+
+ /* go back to dequeued state */
+ __vb2_dqbuf(vb);
+
+ dprintk(2, "dqbuf of buffer %d, with state %d\n",
+ vb->index, vb->state);
+
+ return 0;
+
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_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)
+ {
+ unsigned int i;
+
+ /*
+ * Tell driver to stop all transactions and release all queued
+ * buffers.
+ */
+ if (q->start_streaming_called)
+ call_void_qop(q, stop_streaming, q);
+
+ /*
+ * If you see this warning, then the driver isn't cleaning up properly
+ * in stop_streaming(). See the stop_streaming() documentation in
+ * videobuf2-core.h for more information how buffers should be returned
+ * to vb2 in stop_streaming().
+ */
+ if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
+ for (i = 0; i < q->num_buffers; ++i)
+ if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) {
+ pr_warn("driver bug: stop_streaming operation is leaving buf %p in active state\n",
+ q->bufs[i]);
+ vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR);
+ }
+ /* Must be zero now */
+ WARN_ON(atomic_read(&q->owned_by_drv_count));
+ }
+
+ q->streaming = 0;
+ q->start_streaming_called = 0;
+ q->queued_count = 0;
+ q->error = 0;
+
+ /*
+ * Remove all buffers from videobuf's list...
+ */
+ INIT_LIST_HEAD(&q->queued_list);
+ /*
+ * ...and done list; userspace will not receive any buffers it
+ * has not already dequeued before initiating cancel.
+ */
+ INIT_LIST_HEAD(&q->done_list);
+ atomic_set(&q->owned_by_drv_count, 0);
+ wake_up_all(&q->done_wq);
+
+ /*
+ * Reinitialize all buffers for next use.
+ * Make sure to call buf_finish for any queued buffers. Normally
+ * that's done in dqbuf, but that's not going to happen when we
+ * cancel the whole queue. Note: this code belongs here, not in
+ * __vb2_dqbuf() since in vb2_core_dqbuf() there is a critical
+ * call to __fill_user_buffer() after buf_finish(). That order can't
+ * be changed, so we can't move the buf_finish() to __vb2_dqbuf().
+ */
+ for (i = 0; i < q->num_buffers; ++i) {
+ struct vb2_buffer *vb = q->bufs[i];
+
+ if (vb->state != VB2_BUF_STATE_DEQUEUED) {
+ vb->state = VB2_BUF_STATE_PREPARED;
+ call_void_vb_qop(vb, buf_finish, vb);
+ }
+ __vb2_dqbuf(vb);
+ }
+ }
+
+ int vb2_core_streamon(struct vb2_queue *q, unsigned int type)
+ {
+ int ret;
+
+ if (type != q->type) {
+ dprintk(1, "invalid stream type\n");
+ return -EINVAL;
+ }
+
+ if (q->streaming) {
+ dprintk(3, "already streaming\n");
+ return 0;
+ }
+
+ if (!q->num_buffers) {
+ dprintk(1, "no buffers have been allocated\n");
+ return -EINVAL;
+ }
+
+ if (q->num_buffers < q->min_buffers_needed) {
+ dprintk(1, "need at least %u allocated buffers\n",
+ q->min_buffers_needed);
+ return -EINVAL;
+ }
+
+ /*
+ * Tell driver to start streaming provided sufficient buffers
+ * are available.
+ */
+ if (q->queued_count >= q->min_buffers_needed) {
+ ret = v4l_vb2q_enable_media_source(q);
+ if (ret)
+ return ret;
+ ret = vb2_start_streaming(q);
+ if (ret) {
+ __vb2_queue_cancel(q);
+ return ret;
+ }
+ }
+
+ q->streaming = 1;
+
+ dprintk(3, "successful\n");
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_streamon);
+
+ void vb2_queue_error(struct vb2_queue *q)
+ {
+ q->error = 1;
+
+ wake_up_all(&q->done_wq);
+ }
+ EXPORT_SYMBOL_GPL(vb2_queue_error);
+
+ int vb2_core_streamoff(struct vb2_queue *q, unsigned int type)
+ {
+ if (type != q->type) {
+ dprintk(1, "invalid stream type\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Cancel will pause streaming and remove all buffers from the driver
+ * and videobuf, effectively returning control over them to userspace.
+ *
+ * Note that we do this even if q->streaming == 0: if you prepare or
+ * queue buffers, and then call streamoff without ever having called
+ * streamon, you would still expect those buffers to be returned to
+ * their normal dequeued state.
+ */
+ __vb2_queue_cancel(q);
+ q->waiting_for_buffers = !q->is_output;
+ q->last_buffer_dequeued = false;
+
+ dprintk(3, "successful\n");
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_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,
+ unsigned int *_buffer, unsigned int *_plane)
+ {
+ struct vb2_buffer *vb;
+ unsigned int buffer, plane;
+
+ /*
+ * Go over all buffers and their planes, comparing the given offset
+ * with an offset assigned to each plane. If a match is found,
+ * return its buffer and plane numbers.
+ */
+ for (buffer = 0; buffer < q->num_buffers; ++buffer) {
+ vb = q->bufs[buffer];
+
+ for (plane = 0; plane < vb->num_planes; ++plane) {
+ if (vb->planes[plane].m.offset == off) {
+ *_buffer = buffer;
+ *_plane = plane;
+ return 0;
+ }
+ }
+ }
+
+ return -EINVAL;
+ }
+
+ int vb2_core_expbuf(struct vb2_queue *q, int *fd, unsigned int type,
+ unsigned int index, unsigned int plane, unsigned int flags)
+ {
+ struct vb2_buffer *vb = NULL;
+ struct vb2_plane *vb_plane;
+ int ret;
+ struct dma_buf *dbuf;
+
+ if (q->memory != VB2_MEMORY_MMAP) {
+ dprintk(1, "queue is not currently set up for mmap\n");
+ return -EINVAL;
+ }
+
+ if (!q->mem_ops->get_dmabuf) {
+ dprintk(1, "queue does not support DMA buffer exporting\n");
+ return -EINVAL;
+ }
+
+ if (flags & ~(O_CLOEXEC | O_ACCMODE)) {
+ dprintk(1, "queue does support only O_CLOEXEC and access mode flags\n");
+ return -EINVAL;
+ }
+
+ if (type != q->type) {
+ dprintk(1, "invalid buffer type\n");
+ return -EINVAL;
+ }
+
+ if (index >= q->num_buffers) {
+ dprintk(1, "buffer index out of range\n");
+ return -EINVAL;
+ }
+
+ vb = q->bufs[index];
+
+ if (plane >= vb->num_planes) {
+ dprintk(1, "buffer plane out of range\n");
+ return -EINVAL;
+ }
+
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "expbuf: file io in progress\n");
+ return -EBUSY;
+ }
+
+ vb_plane = &vb->planes[plane];
+
+ dbuf = call_ptr_memop(vb, get_dmabuf, vb_plane->mem_priv,
+ flags & O_ACCMODE);
+ if (IS_ERR_OR_NULL(dbuf)) {
+ dprintk(1, "failed to export buffer %d, plane %d\n",
+ index, plane);
+ return -EINVAL;
+ }
+
+ ret = dma_buf_fd(dbuf, flags & ~O_ACCMODE);
+ if (ret < 0) {
+ dprintk(3, "buffer %d, plane %d failed to export (%d)\n",
+ index, plane, ret);
+ dma_buf_put(dbuf);
+ return ret;
+ }
+
+ dprintk(3, "buffer %d, plane %d exported as %d descriptor\n",
+ index, plane, ret);
+ *fd = ret;
+
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_expbuf);
+
+ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
+ {
+ unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
+ struct vb2_buffer *vb;
+ unsigned int buffer = 0, plane = 0;
+ int ret;
+ unsigned long length;
+
+ if (q->memory != VB2_MEMORY_MMAP) {
+ dprintk(1, "queue is not currently set up for mmap\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Check memory area access mode.
+ */
+ if (!(vma->vm_flags & VM_SHARED)) {
+ dprintk(1, "invalid vma flags, VM_SHARED needed\n");
+ return -EINVAL;
+ }
+ if (q->is_output) {
+ if (!(vma->vm_flags & VM_WRITE)) {
+ dprintk(1, "invalid vma flags, VM_WRITE needed\n");
+ return -EINVAL;
+ }
+ } else {
+ if (!(vma->vm_flags & VM_READ)) {
+ dprintk(1, "invalid vma flags, VM_READ needed\n");
+ return -EINVAL;
+ }
+ }
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "mmap: file io in progress\n");
+ return -EBUSY;
+ }
+
+ /*
+ * Find the plane corresponding to the offset passed by userspace.
+ */
+ ret = __find_plane_by_offset(q, off, &buffer, &plane);
+ if (ret)
+ return ret;
+
+ vb = q->bufs[buffer];
+
+ /*
+ * MMAP requires page_aligned buffers.
+ * The buffer length was page_aligned at __vb2_buf_mem_alloc(),
+ * so, we need to do the same here.
+ */
+ length = PAGE_ALIGN(vb->planes[plane].length);
+ if (length < (vma->vm_end - vma->vm_start)) {
+ dprintk(1,
+ "MMAP invalid, as it would overflow buffer length\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&q->mmap_lock);
+ ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma);
+ mutex_unlock(&q->mmap_lock);
+ if (ret)
+ return ret;
+
+ dprintk(3, "buffer %d, plane %d successfully mapped\n", buffer, plane);
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_mmap);
+
+ #ifndef CONFIG_MMU
+ unsigned long vb2_get_unmapped_area(struct vb2_queue *q,
+ unsigned long addr,
+ unsigned long len,
+ unsigned long pgoff,
+ unsigned long flags)
+ {
+ unsigned long off = pgoff << PAGE_SHIFT;
+ struct vb2_buffer *vb;
+ unsigned int buffer, plane;
+ void *vaddr;
+ int ret;
+
+ if (q->memory != VB2_MEMORY_MMAP) {
+ dprintk(1, "queue is not currently set up for mmap\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Find the plane corresponding to the offset passed by userspace.
+ */
+ ret = __find_plane_by_offset(q, off, &buffer, &plane);
+ if (ret)
+ return ret;
+
+ vb = q->bufs[buffer];
+
+ vaddr = vb2_plane_vaddr(vb, plane);
+ return vaddr ? (unsigned long)vaddr : -EINVAL;
+ }
+ EXPORT_SYMBOL_GPL(vb2_get_unmapped_area);
+ #endif
+
+ int vb2_core_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))
+ return -EINVAL;
+
+ 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);
+
+ q->memory = VB2_MEMORY_UNKNOWN;
+
+ if (q->buf_struct_size == 0)
+ q->buf_struct_size = sizeof(struct vb2_buffer);
+
+ if (q->bidirectional)
+ q->dma_dir = DMA_BIDIRECTIONAL;
+ else
+ q->dma_dir = q->is_output ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_queue_init);
+
+ static int __vb2_init_fileio(struct vb2_queue *q, int read);
+ static int __vb2_cleanup_fileio(struct vb2_queue *q);
+ void vb2_core_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_core_queue_release);
+
- unsigned long req_events = poll_requested_events(wait);
++__poll_t vb2_core_poll(struct vb2_queue *q, struct file *file,
+ poll_table *wait)
+ {
++ __poll_t req_events = poll_requested_events(wait);
+ struct vb2_buffer *vb = NULL;
+ unsigned long flags;
+
+ if (!q->is_output && !(req_events & (POLLIN | POLLRDNORM)))
+ return 0;
+ if (q->is_output && !(req_events & (POLLOUT | POLLWRNORM)))
+ return 0;
+
+ /*
+ * 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 (!q->is_output && (q->io_modes & VB2_READ) &&
+ (req_events & (POLLIN | POLLRDNORM))) {
+ if (__vb2_init_fileio(q, 1))
+ return POLLERR;
+ }
+ if (q->is_output && (q->io_modes & VB2_WRITE) &&
+ (req_events & (POLLOUT | POLLWRNORM))) {
+ if (__vb2_init_fileio(q, 0))
+ return POLLERR;
+ /*
+ * Write to OUTPUT queue can be done immediately.
+ */
+ return 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 POLLERR;
+
+ /*
+ * If this quirk is set and 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.
+ * This quirk is set by V4L2 for backwards compatibility reasons.
+ */
+ if (q->quirk_poll_must_check_waiting_for_buffers &&
+ q->waiting_for_buffers && (req_events & (POLLIN | POLLRDNORM)))
+ return POLLERR;
+
+ /*
+ * For output streams you can call write() as long as there are fewer
+ * buffers queued than there are buffers available.
+ */
+ if (q->is_output && q->fileio && q->queued_count < q->num_buffers)
+ return 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 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 (q->is_output) ?
+ POLLOUT | POLLWRNORM :
+ POLLIN | POLLRDNORM;
+ }
+ return 0;
+ }
+ EXPORT_SYMBOL_GPL(vb2_core_poll);
+
+ /*
+ * 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 {
+ unsigned int count;
+ unsigned int type;
+ unsigned int memory;
+ 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(*fileio), 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->count = count;
+ fileio->memory = VB2_MEMORY_MMAP;
+ fileio->type = q->type;
+ q->fileio = fileio;
+ ret = vb2_core_reqbufs(q, fileio->memory, &fileio->count);
+ 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) {
+ /*
+ * Queue all buffers.
+ */
+ for (i = 0; i < q->num_buffers; i++) {
+ ret = vb2_core_qbuf(q, i, NULL);
+ 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_core_streamon(q, q->type);
+ if (ret)
+ goto err_reqbufs;
+
+ return ret;
+
+ err_reqbufs:
+ fileio->count = 0;
+ vb2_core_reqbufs(q, fileio->memory, &fileio->count);
+
+ 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_core_streamoff(q, q->type);
+ q->fileio = NULL;
+ fileio->count = 0;
+ vb2_core_reqbufs(q, fileio->memory, &fileio->count);
+ 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 = q->is_multiplanar;
+ /*
+ * When using write() to write data to an output video node the vb2 core
+ * should copy timestamps if V4L2_BUF_FLAG_TIMESTAMP_COPY is set. Nobody
+ * else is able to provide this information with the write() operation.
+ */
+ bool copy_timestamp = !read && q->copy_timestamp;
+ unsigned index;
+ int ret;
+
+ 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) {
+ struct vb2_buffer *b;
+
+ /*
+ * Call vb2_dqbuf to get buffer back.
+ */
+ ret = vb2_core_dqbuf(q, &index, NULL, nonblock);
+ dprintk(5, "vb2_dqbuf result: %d\n", ret);
+ if (ret)
+ return ret;
+ fileio->dq_count += 1;
+
+ fileio->cur_index = index;
+ buf = &fileio->bufs[index];
+ b = q->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 &&
+ b->planes[0].data_offset < buf->size) {
+ buf->pos = b->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)) {
+ struct vb2_buffer *b = q->bufs[index];
+
+ /*
+ * 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.
+ */
+ b->planes[0].bytesused = buf->pos;
+
+ if (copy_timestamp)
+ b->timestamp = ktime_get_ns();
+ ret = vb2_core_qbuf(q, index, NULL);
+ 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;
+ bool copy_timestamp = false;
+ unsigned prequeue = 0;
+ unsigned index = 0;
+ int ret = 0;
+
+ if (q->is_output) {
+ prequeue = q->num_buffers;
+ copy_timestamp = q->copy_timestamp;
+ }
+
+ set_freezable();
+
+ for (;;) {
+ struct vb2_buffer *vb;
+
+ /*
+ * Call vb2_dqbuf to get buffer back.
+ */
+ if (prequeue) {
+ vb = q->bufs[index++];
+ prequeue--;
+ } else {
+ call_void_qop(q, wait_finish, q);
+ if (!threadio->stop)
+ ret = vb2_core_dqbuf(q, &index, NULL, 0);
+ call_void_qop(q, wait_prepare, q);
+ dprintk(5, "file io: vb2_dqbuf result: %d\n", ret);
+ if (!ret)
+ vb = q->bufs[index];
+ }
+ if (ret || threadio->stop)
+ break;
+ try_to_freeze();
+
+ if (vb->state != VB2_BUF_STATE_ERROR)
+ if (threadio->fnc(vb, threadio->priv))
+ break;
+ call_void_qop(q, wait_finish, q);
+ if (copy_timestamp)
+ vb->timestamp = ktime_get_ns();
+ if (!threadio->stop)
+ ret = vb2_core_qbuf(q, vb->index, NULL);
+ 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, !q->is_output);
+ 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);
+
+ MODULE_DESCRIPTION("Media buffer core framework");
+ MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
+ MODULE_LICENSE("GPL");
--- /dev/null
-unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
+ /*
+ * videobuf2-v4l2.c - V4L2 driver helper framework
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Pawel Osciak <pawel@osciak.com>
+ * Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * The vb2_thread implementation was based on code from videobuf-dvb.c:
+ * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+ #include <linux/err.h>
+ #include <linux/kernel.h>
+ #include <linux/module.h>
+ #include <linux/mm.h>
+ #include <linux/poll.h>
+ #include <linux/slab.h>
+ #include <linux/sched.h>
+ #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>
+
+ static int debug;
+ module_param(debug, int, 0644);
+
+ #define dprintk(level, fmt, arg...) \
+ do { \
+ if (debug >= level) \
+ pr_info("vb2-v4l2: %s: " fmt, __func__, ## arg); \
+ } while (0)
+
+ /* 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_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)
+ {
+ if (!V4L2_TYPE_IS_MULTIPLANAR(b->type))
+ return 0;
+
+ /* Is memory for copying plane information present? */
+ if (b->m.planes == NULL) {
+ dprintk(1, "multi-planar buffer passed but planes array not provided\n");
+ return -EINVAL;
+ }
+
+ if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) {
+ dprintk(1, "incorrect planes array length, expected %d, got %d\n",
+ vb->num_planes, b->length);
+ return -EINVAL;
+ }
+
+ return 0;
+ }
+
+ static int __verify_planes_array_core(struct vb2_buffer *vb, const void *pb)
+ {
+ return __verify_planes_array(vb, pb);
+ }
+
+ /*
+ * __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;
+ }
+
+ static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
+ {
+ const struct v4l2_buffer *b = pb;
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ struct vb2_queue *q = vb->vb2_queue;
+
+ if (q->is_output) {
+ /*
+ * For output buffers copy the timestamp if needed,
+ * and the timecode field and flag if needed.
+ */
+ if (q->copy_timestamp)
+ vb->timestamp = timeval_to_ns(&b->timestamp);
+ vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
+ if (b->flags & V4L2_BUF_FLAG_TIMECODE)
+ vbuf->timecode = b->timecode;
+ }
+ };
+
+ static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
+ {
+ static bool check_once;
+
+ if (check_once)
+ return;
+
+ check_once = true;
+ WARN_ON(1);
+
+ pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");
+ if (vb->vb2_queue->allow_zero_bytesused)
+ pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
+ else
+ pr_warn("use the actual size instead.\n");
+ }
+
+ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
+ const char *opname)
+ {
+ if (b->type != q->type) {
+ dprintk(1, "%s: invalid buffer type\n", opname);
+ return -EINVAL;
+ }
+
+ if (b->index >= q->num_buffers) {
+ dprintk(1, "%s: buffer index out of range\n", opname);
+ return -EINVAL;
+ }
+
+ if (q->bufs[b->index] == NULL) {
+ /* Should never happen */
+ dprintk(1, "%s: buffer is NULL\n", opname);
+ return -EINVAL;
+ }
+
+ if (b->memory != q->memory) {
+ dprintk(1, "%s: invalid memory type\n", opname);
+ return -EINVAL;
+ }
+
+ return __verify_planes_array(q->bufs[b->index], b);
+ }
+
+ /*
+ * __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, void *pb)
+ {
+ struct v4l2_buffer *b = pb;
+ 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 = ns_to_timeval(vb->timestamp);
+ b->timecode = vbuf->timecode;
+ b->sequence = vbuf->sequence;
+ b->reserved2 = 0;
+ b->reserved = 0;
+
+ if (q->is_multiplanar) {
+ /*
+ * 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->copy_timestamp) {
+ /*
+ * 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:
+ case VB2_BUF_STATE_REQUEUEING:
+ /* nothing */
+ break;
+ }
+
+ if (vb2_buffer_in_use(q, vb))
+ b->flags |= V4L2_BUF_FLAG_MAPPED;
+
+ if (!q->is_output &&
+ b->flags & V4L2_BUF_FLAG_DONE &&
+ b->flags & V4L2_BUF_FLAG_LAST)
+ q->last_buffer_dequeued = true;
+ }
+
+ /*
+ * __fill_vb2_buffer() - fill a vb2_buffer with information provided in a
+ * v4l2_buffer by the userspace. It also verifies that struct
+ * v4l2_buffer has a valid number of planes.
+ */
+ static int __fill_vb2_buffer(struct vb2_buffer *vb,
+ const void *pb, struct vb2_plane *planes)
+ {
+ struct vb2_queue *q = vb->vb2_queue;
+ const struct v4l2_buffer *b = pb;
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+ unsigned int plane;
+ int ret;
+
+ ret = __verify_length(vb, b);
+ if (ret < 0) {
+ dprintk(1, "plane parameters verification failed: %d\n", ret);
+ return ret;
+ }
+ if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) {
+ /*
+ * If the format's field is ALTERNATE, then the buffer's field
+ * should be either TOP or BOTTOM, not ALTERNATE since that
+ * makes no sense. The driver has to know whether the
+ * buffer represents a top or a bottom field in order to
+ * program any DMA correctly. Using ALTERNATE is wrong, since
+ * that just says that it is either a top or a bottom field,
+ * but not which of the two it is.
+ */
+ dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n");
+ return -EINVAL;
+ }
+ vb->timestamp = 0;
+ vbuf->sequence = 0;
+
+ 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->copy_timestamp || !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_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;
+ /* Zero last flag, this is a signal from driver to userspace */
+ vbuf->flags &= ~V4L2_BUF_FLAG_LAST;
+ }
+
+ return 0;
+ }
+
+ static const struct vb2_buf_ops v4l2_buf_ops = {
+ .verify_planes_array = __verify_planes_array_core,
+ .fill_user_buffer = __fill_v4l2_buffer,
+ .fill_vb2_buffer = __fill_vb2_buffer,
+ .copy_timestamp = __copy_timestamp,
+ };
+
+ /*
+ * 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)
+ vb2_core_querybuf(q, b->index, b);
+ return ret;
+ }
+ EXPORT_SYMBOL(vb2_querybuf);
+
+ int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
+ {
+ int ret = vb2_verify_memory_type(q, req->memory, req->type);
+
+ return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count);
+ }
+ EXPORT_SYMBOL_GPL(vb2_reqbufs);
+
+ int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
+ {
+ 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");
+
+ return ret ? ret : vb2_core_prepare_buf(q, b->index, b);
+ }
+ EXPORT_SYMBOL_GPL(vb2_prepare_buf);
+
+ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
+ {
+ unsigned requested_planes = 1;
+ unsigned requested_sizes[VIDEO_MAX_PLANES];
+ struct v4l2_format *f = &create->format;
+ int ret = vb2_verify_memory_type(q, create->memory, f->type);
+ unsigned i;
+
+ create->index = q->num_buffers;
+ if (create->count == 0)
+ return ret != -EBUSY ? ret : 0;
+
+ switch (f->type) {
+ case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
+ case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
+ requested_planes = f->fmt.pix_mp.num_planes;
+ if (requested_planes == 0 ||
+ requested_planes > VIDEO_MAX_PLANES)
+ return -EINVAL;
+ for (i = 0; i < requested_planes; i++)
+ requested_sizes[i] =
+ f->fmt.pix_mp.plane_fmt[i].sizeimage;
+ break;
+ case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+ case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+ requested_sizes[0] = f->fmt.pix.sizeimage;
+ break;
+ case V4L2_BUF_TYPE_VBI_CAPTURE:
+ case V4L2_BUF_TYPE_VBI_OUTPUT:
+ requested_sizes[0] = f->fmt.vbi.samples_per_line *
+ (f->fmt.vbi.count[0] + f->fmt.vbi.count[1]);
+ break;
+ case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
+ case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
+ requested_sizes[0] = f->fmt.sliced.io_size;
+ break;
+ case V4L2_BUF_TYPE_SDR_CAPTURE:
+ case V4L2_BUF_TYPE_SDR_OUTPUT:
+ requested_sizes[0] = f->fmt.sdr.buffersize;
+ break;
+ case V4L2_BUF_TYPE_META_CAPTURE:
+ requested_sizes[0] = f->fmt.meta.buffersize;
+ break;
+ default:
+ return -EINVAL;
+ }
+ for (i = 0; i < requested_planes; i++)
+ if (requested_sizes[i] == 0)
+ return -EINVAL;
+ return ret ? ret : vb2_core_create_bufs(q, create->memory,
+ &create->count, requested_planes, requested_sizes);
+ }
+ EXPORT_SYMBOL_GPL(vb2_create_bufs);
+
+ int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
+ {
+ 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, "qbuf");
+ return ret ? ret : vb2_core_qbuf(q, b->index, b);
+ }
+ EXPORT_SYMBOL_GPL(vb2_qbuf);
+
+ int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
+ {
+ int ret;
+
+ if (vb2_fileio_is_active(q)) {
+ dprintk(1, "file io in progress\n");
+ return -EBUSY;
+ }
+
+ if (b->type != q->type) {
+ dprintk(1, "invalid buffer type\n");
+ return -EINVAL;
+ }
+
+ ret = vb2_core_dqbuf(q, NULL, b, nonblocking);
+
+ /*
+ * After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be
+ * cleared.
+ */
+ b->flags &= ~V4L2_BUF_FLAG_DONE;
+
+ return ret;
+ }
+ EXPORT_SYMBOL_GPL(vb2_dqbuf);
+
+ 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_core_streamon(q, type);
+ }
+ EXPORT_SYMBOL_GPL(vb2_streamon);
+
+ 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_core_streamoff(q, type);
+ }
+ EXPORT_SYMBOL_GPL(vb2_streamoff);
+
+ int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb)
+ {
+ return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index,
+ eb->plane, eb->flags);
+ }
+ EXPORT_SYMBOL_GPL(vb2_expbuf);
+
+ int vb2_queue_init(struct vb2_queue *q)
+ {
+ /*
+ * Sanity check
+ */
+ if (WARN_ON(!q) ||
+ 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);
+
+ /* Warn that vb2_memory should match with v4l2_memory */
+ if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP)
+ || WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR)
+ || WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF))
+ return -EINVAL;
+
+ if (q->buf_struct_size == 0)
+ q->buf_struct_size = sizeof(struct vb2_v4l2_buffer);
+
+ q->buf_ops = &v4l2_buf_ops;
+ q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
+ q->is_output = V4L2_TYPE_IS_OUTPUT(q->type);
+ q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK)
+ == V4L2_BUF_FLAG_TIMESTAMP_COPY;
+ /*
+ * 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.
+ */
+ q->quirk_poll_must_check_waiting_for_buffers = true;
+
+ return vb2_core_queue_init(q);
+ }
+ EXPORT_SYMBOL_GPL(vb2_queue_init);
+
+ void vb2_queue_release(struct vb2_queue *q)
+ {
+ vb2_core_queue_release(q);
+ }
+ EXPORT_SYMBOL_GPL(vb2_queue_release);
+
- unsigned long req_events = poll_requested_events(wait);
- unsigned int res = 0;
++__poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
+ {
+ struct video_device *vfd = video_devdata(file);
-unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
++ __poll_t req_events = poll_requested_events(wait);
++ __poll_t res = 0;
+
+ 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);
+ }
+
+ return res | vb2_core_poll(q, file, wait);
+ }
+ EXPORT_SYMBOL_GPL(vb2_poll);
+
+ /*
+ * 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 = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
+
+ if (res)
+ return res;
+ if (vb2_queue_is_busy(vdev, file))
+ return -EBUSY;
+ res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count);
+ /* 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 = vb2_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 vb2_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 = vb2_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 res;
++__poll_t 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;
++ __poll_t 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");
projects / linux-2.6-microblaze.git / commitdiff