diff options
Diffstat (limited to 'drivers/media/v4l2-core/videobuf2-core.c')
-rw-r--r-- | drivers/media/v4l2-core/videobuf2-core.c | 2607 |
1 files changed, 0 insertions, 2607 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c deleted file mode 100644 index a8589d96ef72..000000000000 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ /dev/null @@ -1,2607 +0,0 @@ -/* - * 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. - */ - -#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("vb2-core: %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; - - 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("vb2: counters for queue %p:%s\n", q, - unbalanced ? " UNBALANCED!" : ""); - pr_info("vb2: setup: %u start_streaming: %u stop_streaming: %u\n", - q->cnt_queue_setup, q->cnt_start_streaming, - q->cnt_stop_streaming); - pr_info("vb2: 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("vb2: counters for queue %p, buffer %d:%s\n", - q, buffer, unbalanced ? " UNBALANCED!" : ""); - pr_info("vb2: buf_init: %u buf_cleanup: %u buf_prepare: %u buf_finish: %u\n", - vb->cnt_buf_init, vb->cnt_buf_cleanup, - vb->cnt_buf_prepare, vb->cnt_buf_finish); - pr_info("vb2: buf_queue: %u buf_done: %u\n", - vb->cnt_buf_queue, vb->cnt_buf_done); - pr_info("vb2: 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("vb2: get_userptr: %u put_userptr: %u\n", - vb->cnt_mem_get_userptr, vb->cnt_mem_put_userptr); - pr_info("vb2: 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("vb2: 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 = 0; - 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 != 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. - */ - num_buffers = min_t(unsigned int, *count, VB2_MAX_FRAME); - num_buffers = max_t(unsigned int, num_buffers, q->min_buffers_needed); - 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) - 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); - - 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 int vb2_core_poll(struct vb2_queue *q, struct file *file, - poll_table *wait) -{ - unsigned long 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"); |