diff options
Diffstat (limited to 'drivers/media/v4l2-core/videobuf2-dma-sg.c')
| -rw-r--r-- | drivers/media/v4l2-core/videobuf2-dma-sg.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c index 2bf13dc4df34..346e39b2aae8 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c @@ -96,6 +96,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, { struct vb2_dma_sg_conf *conf = alloc_ctx; struct vb2_dma_sg_buf *buf; + struct sg_table *sgt; int ret; int num_pages; @@ -128,6 +129,12 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, /* Prevent the device from being released while the buffer is used */ buf->dev = get_device(conf->dev); + + sgt = &buf->sg_table; + if (dma_map_sg(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir) == 0) + goto fail_map; + dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); + buf->handler.refcount = &buf->refcount; buf->handler.put = vb2_dma_sg_put; buf->handler.arg = buf; @@ -138,6 +145,9 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, __func__, buf->num_pages); return buf; +fail_map: + put_device(buf->dev); + sg_free_table(sgt); fail_table_alloc: num_pages = buf->num_pages; while (num_pages--) @@ -152,11 +162,13 @@ fail_pages_array_alloc: static void vb2_dma_sg_put(void *buf_priv) { struct vb2_dma_sg_buf *buf = buf_priv; + struct sg_table *sgt = &buf->sg_table; int i = buf->num_pages; if (atomic_dec_and_test(&buf->refcount)) { dprintk(1, "%s: Freeing buffer of %d pages\n", __func__, buf->num_pages); + dma_unmap_sg(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); if (buf->vaddr) vm_unmap_ram(buf->vaddr, buf->num_pages); sg_free_table(&buf->sg_table); @@ -168,6 +180,22 @@ static void vb2_dma_sg_put(void *buf_priv) } } +static void vb2_dma_sg_prepare(void *buf_priv) +{ + struct vb2_dma_sg_buf *buf = buf_priv; + struct sg_table *sgt = &buf->sg_table; + + dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); +} + +static void vb2_dma_sg_finish(void *buf_priv) +{ + struct vb2_dma_sg_buf *buf = buf_priv; + struct sg_table *sgt = &buf->sg_table; + + dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); +} + static inline int vma_is_io(struct vm_area_struct *vma) { return !!(vma->vm_flags & (VM_IO | VM_PFNMAP)); @@ -177,16 +205,19 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr, unsigned long size, enum dma_data_direction dma_dir) { + struct vb2_dma_sg_conf *conf = alloc_ctx; struct vb2_dma_sg_buf *buf; unsigned long first, last; int num_pages_from_user; struct vm_area_struct *vma; + struct sg_table *sgt; buf = kzalloc(sizeof *buf, GFP_KERNEL); if (!buf) return NULL; buf->vaddr = NULL; + buf->dev = conf->dev; buf->dma_dir = dma_dir; buf->offset = vaddr & ~PAGE_MASK; buf->size = size; @@ -246,8 +277,14 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr, buf->num_pages, buf->offset, size, 0)) goto userptr_fail_alloc_table_from_pages; + sgt = &buf->sg_table; + if (dma_map_sg(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir) == 0) + goto userptr_fail_map; + dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); return buf; +userptr_fail_map: + sg_free_table(&buf->sg_table); userptr_fail_alloc_table_from_pages: userptr_fail_get_user_pages: dprintk(1, "get_user_pages requested/got: %d/%d]\n", @@ -270,10 +307,12 @@ userptr_fail_alloc_pages: static void vb2_dma_sg_put_userptr(void *buf_priv) { struct vb2_dma_sg_buf *buf = buf_priv; + struct sg_table *sgt = &buf->sg_table; int i = buf->num_pages; dprintk(1, "%s: Releasing userspace buffer of %d pages\n", __func__, buf->num_pages); + dma_unmap_sg(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir); if (buf->vaddr) vm_unmap_ram(buf->vaddr, buf->num_pages); sg_free_table(&buf->sg_table); @@ -360,6 +399,8 @@ const struct vb2_mem_ops vb2_dma_sg_memops = { .put = vb2_dma_sg_put, .get_userptr = vb2_dma_sg_get_userptr, .put_userptr = vb2_dma_sg_put_userptr, + .prepare = vb2_dma_sg_prepare, + .finish = vb2_dma_sg_finish, .vaddr = vb2_dma_sg_vaddr, .mmap = vb2_dma_sg_mmap, .num_users = vb2_dma_sg_num_users, |