diff options
| -rw-r--r-- | drivers/media/v4l2-core/videobuf2-core.c | 17 | ||||
| -rw-r--r-- | drivers/media/v4l2-core/videobuf2-dma-contig.c | 3 | ||||
| -rw-r--r-- | drivers/media/v4l2-core/videobuf2-dma-sg.c | 6 | ||||
| -rw-r--r-- | drivers/media/v4l2-core/videobuf2-vmalloc.c | 6 | ||||
| -rw-r--r-- | include/media/videobuf2-core.h | 13 |
5 files changed, 31 insertions, 14 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index 0924594989b4..cb115ba6a1d2 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -194,8 +194,6 @@ static void __enqueue_in_driver(struct vb2_buffer *vb); static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) { struct vb2_queue *q = vb->vb2_queue; - enum dma_data_direction dma_dir = - q->is_output ? DMA_TO_DEVICE : DMA_FROM_DEVICE; void *mem_priv; int plane; int ret = -ENOMEM; @@ -209,7 +207,7 @@ static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) mem_priv = call_ptr_memop(vb, alloc, q->alloc_devs[plane] ? : q->dev, - q->dma_attrs, size, dma_dir, q->gfp_flags); + 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); @@ -978,8 +976,6 @@ static int __prepare_userptr(struct vb2_buffer *vb, const void *pb) void *mem_priv; unsigned int plane; int ret = 0; - enum dma_data_direction dma_dir = - q->is_output ? DMA_TO_DEVICE : DMA_FROM_DEVICE; bool reacquired = vb->planes[0].mem_priv == NULL; memset(planes, 0, sizeof(planes[0]) * vb->num_planes); @@ -1030,7 +1026,7 @@ static int __prepare_userptr(struct vb2_buffer *vb, const void *pb) mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_devs[plane] ? : q->dev, planes[plane].m.userptr, - planes[plane].length, dma_dir); + planes[plane].length, q->dma_dir); if (IS_ERR(mem_priv)) { dprintk(1, "failed acquiring userspace memory for plane %d\n", plane); @@ -1096,8 +1092,6 @@ static int __prepare_dmabuf(struct vb2_buffer *vb, const void *pb) void *mem_priv; unsigned int plane; int ret = 0; - enum dma_data_direction dma_dir = - q->is_output ? DMA_TO_DEVICE : DMA_FROM_DEVICE; bool reacquired = vb->planes[0].mem_priv == NULL; memset(planes, 0, sizeof(planes[0]) * vb->num_planes); @@ -1156,7 +1150,7 @@ static int __prepare_dmabuf(struct vb2_buffer *vb, const void *pb) /* Acquire each plane's memory */ mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_devs[plane] ? : q->dev, - dbuf, planes[plane].length, dma_dir); + dbuf, planes[plane].length, q->dma_dir); if (IS_ERR(mem_priv)) { dprintk(1, "failed to attach dmabuf\n"); ret = PTR_ERR(mem_priv); @@ -2003,6 +1997,11 @@ int vb2_core_queue_init(struct vb2_queue *q) 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); diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c index 5b90a66b9e78..9f389f36566d 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c @@ -508,7 +508,8 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr, buf->dma_dir = dma_dir; offset = vaddr & ~PAGE_MASK; - vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE); + vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE || + dma_dir == DMA_BIDIRECTIONAL); if (IS_ERR(vec)) { ret = PTR_ERR(vec); goto fail_buf; diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c index 54f33938d45b..6808231a6bdc 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c @@ -239,7 +239,8 @@ static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr, buf->offset = vaddr & ~PAGE_MASK; buf->size = size; buf->dma_sgt = &buf->sg_table; - vec = vb2_create_framevec(vaddr, size, buf->dma_dir == DMA_FROM_DEVICE); + vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE || + dma_dir == DMA_BIDIRECTIONAL); if (IS_ERR(vec)) goto userptr_fail_pfnvec; buf->vec = vec; @@ -292,7 +293,8 @@ static void vb2_dma_sg_put_userptr(void *buf_priv) vm_unmap_ram(buf->vaddr, buf->num_pages); sg_free_table(buf->dma_sgt); while (--i >= 0) { - if (buf->dma_dir == DMA_FROM_DEVICE) + if (buf->dma_dir == DMA_FROM_DEVICE || + buf->dma_dir == DMA_BIDIRECTIONAL) set_page_dirty_lock(buf->pages[i]); } vb2_destroy_framevec(buf->vec); diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c index 6bc130fe84f6..3a7c80cd1a17 100644 --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c @@ -87,7 +87,8 @@ static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr, buf->dma_dir = dma_dir; offset = vaddr & ~PAGE_MASK; buf->size = size; - vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE); + vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE || + dma_dir == DMA_BIDIRECTIONAL); if (IS_ERR(vec)) { ret = PTR_ERR(vec); goto fail_pfnvec_create; @@ -137,7 +138,8 @@ static void vb2_vmalloc_put_userptr(void *buf_priv) pages = frame_vector_pages(buf->vec); if (vaddr) vm_unmap_ram((void *)vaddr, n_pages); - if (buf->dma_dir == DMA_FROM_DEVICE) + if (buf->dma_dir == DMA_FROM_DEVICE || + buf->dma_dir == DMA_BIDIRECTIONAL) for (i = 0; i < n_pages; i++) set_page_dirty_lock(pages[i]); } else { diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index cb97c224be73..ef9b64398c8c 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -427,6 +427,16 @@ struct vb2_buf_ops { * @dev: device to use for the default allocation context if the driver * doesn't fill in the @alloc_devs array. * @dma_attrs: DMA attributes to use for the DMA. + * @bidirectional: when this flag is set the DMA direction for the buffers of + * this queue will be overridden with DMA_BIDIRECTIONAL direction. + * This is useful in cases where the hardware (firmware) writes to + * a buffer which is mapped as read (DMA_TO_DEVICE), or reads from + * buffer which is mapped for write (DMA_FROM_DEVICE) in order + * to satisfy some internal hardware restrictions or adds a padding + * needed by the processing algorithm. In case the DMA mapping is + * not bidirectional but the hardware (firmware) trying to access + * the buffer (in the opposite direction) this could lead to an + * IOMMU protection faults. * @fileio_read_once: report EOF after reading the first buffer * @fileio_write_immediately: queue buffer after each write() call * @allow_zero_bytesused: allow bytesused == 0 to be passed to the driver @@ -465,6 +475,7 @@ struct vb2_buf_ops { * Private elements (won't appear at the uAPI book): * @mmap_lock: private mutex used when buffers are allocated/freed/mmapped * @memory: current memory type used + * @dma_dir: DMA mapping direction. * @bufs: videobuf buffer structures * @num_buffers: number of allocated/used buffers * @queued_list: list of buffers currently queued from userspace @@ -495,6 +506,7 @@ struct vb2_queue { unsigned int io_modes; struct device *dev; unsigned long dma_attrs; + unsigned bidirectional:1; unsigned fileio_read_once:1; unsigned fileio_write_immediately:1; unsigned allow_zero_bytesused:1; @@ -516,6 +528,7 @@ struct vb2_queue { /* private: internal use only */ struct mutex mmap_lock; unsigned int memory; + enum dma_data_direction dma_dir; struct vb2_buffer *bufs[VB2_MAX_FRAME]; unsigned int num_buffers; |