From cd474037c4a9a9c15cab46ff26ceeed1bbda6abb Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 18 Nov 2014 09:50:58 -0300 Subject: [PATCH] [media] vb2: replace 'write' by 'dma_dir' The 'write' argument is very ambiguous. I first assumed that if it is 1, then we're doing video output but instead it meant the reverse. Since it is used to setup the dma_dir value anyway it is now replaced by the correct dma_dir value which is unambiguous. Signed-off-by: Hans Verkuil Acked-by: Pawel Osciak Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/videobuf2-core.c | 10 +++-- .../media/v4l2-core/videobuf2-dma-contig.c | 40 ++++++++++--------- drivers/media/v4l2-core/videobuf2-dma-sg.c | 13 +++--- drivers/media/v4l2-core/videobuf2-vmalloc.c | 16 ++++---- include/media/videobuf2-core.h | 6 ++- 5 files changed, 47 insertions(+), 38 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index f2e43de3dd87..573f6fb9b40f 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -1358,7 +1358,8 @@ static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) void *mem_priv; unsigned int plane; int ret; - int write = !V4L2_TYPE_IS_OUTPUT(q->type); + enum dma_data_direction dma_dir = + V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; bool reacquired = vb->planes[0].mem_priv == NULL; memset(planes, 0, sizeof(planes[0]) * vb->num_planes); @@ -1400,7 +1401,7 @@ static int __qbuf_userptr(struct vb2_buffer *vb, const struct v4l2_buffer *b) /* Acquire each plane's memory */ mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane], planes[plane].m.userptr, - planes[plane].length, write); + planes[plane].length, dma_dir); if (IS_ERR_OR_NULL(mem_priv)) { dprintk(1, "failed acquiring userspace " "memory for plane %d\n", plane); @@ -1461,7 +1462,8 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) void *mem_priv; unsigned int plane; int ret; - int write = !V4L2_TYPE_IS_OUTPUT(q->type); + enum dma_data_direction dma_dir = + V4L2_TYPE_IS_OUTPUT(q->type) ? DMA_TO_DEVICE : DMA_FROM_DEVICE; bool reacquired = vb->planes[0].mem_priv == NULL; memset(planes, 0, sizeof(planes[0]) * vb->num_planes); @@ -1509,7 +1511,7 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) /* Acquire each plane's memory */ mem_priv = call_ptr_memop(vb, attach_dmabuf, q->alloc_ctx[plane], - dbuf, planes[plane].length, write); + dbuf, planes[plane].length, dma_dir); if (IS_ERR(mem_priv)) { dprintk(1, "failed to attach dmabuf\n"); ret = PTR_ERR(mem_priv); diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c index 4a02ade14b4f..2bdffd383572 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c @@ -229,7 +229,7 @@ static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma) struct vb2_dc_attachment { struct sg_table sgt; - enum dma_data_direction dir; + enum dma_data_direction dma_dir; }; static int vb2_dc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, @@ -264,7 +264,7 @@ static int vb2_dc_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev, wr = sg_next(wr); } - attach->dir = DMA_NONE; + attach->dma_dir = DMA_NONE; dbuf_attach->priv = attach; return 0; @@ -282,16 +282,16 @@ static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf, sgt = &attach->sgt; /* release the scatterlist cache */ - if (attach->dir != DMA_NONE) + if (attach->dma_dir != DMA_NONE) dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, - attach->dir); + attach->dma_dir); sg_free_table(sgt); kfree(attach); db_attach->priv = NULL; } static struct sg_table *vb2_dc_dmabuf_ops_map( - struct dma_buf_attachment *db_attach, enum dma_data_direction dir) + struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) { struct vb2_dc_attachment *attach = db_attach->priv; /* stealing dmabuf mutex to serialize map/unmap operations */ @@ -303,27 +303,27 @@ static struct sg_table *vb2_dc_dmabuf_ops_map( sgt = &attach->sgt; /* return previously mapped sg table */ - if (attach->dir == dir) { + if (attach->dma_dir == dma_dir) { mutex_unlock(lock); return sgt; } /* release any previous cache */ - if (attach->dir != DMA_NONE) { + if (attach->dma_dir != DMA_NONE) { dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, - attach->dir); - attach->dir = DMA_NONE; + attach->dma_dir); + attach->dma_dir = DMA_NONE; } /* mapping to the client with new direction */ - ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dir); + ret = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents, dma_dir); if (ret <= 0) { pr_err("failed to map scatterlist\n"); mutex_unlock(lock); return ERR_PTR(-EIO); } - attach->dir = dir; + attach->dma_dir = dma_dir; mutex_unlock(lock); @@ -331,7 +331,7 @@ static struct sg_table *vb2_dc_dmabuf_ops_map( } static void vb2_dc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach, - struct sg_table *sgt, enum dma_data_direction dir) + struct sg_table *sgt, enum dma_data_direction dma_dir) { /* nothing to be done here */ } @@ -460,7 +460,8 @@ static int vb2_dc_get_user_pfn(unsigned long start, int n_pages, } static int vb2_dc_get_user_pages(unsigned long start, struct page **pages, - int n_pages, struct vm_area_struct *vma, int write) + int n_pages, struct vm_area_struct *vma, + enum dma_data_direction dma_dir) { if (vma_is_io(vma)) { unsigned int i; @@ -482,7 +483,7 @@ static int vb2_dc_get_user_pages(unsigned long start, struct page **pages, int n; n = get_user_pages(current, current->mm, start & PAGE_MASK, - n_pages, write, 1, pages, NULL); + n_pages, dma_dir == DMA_FROM_DEVICE, 1, pages, NULL); /* negative error means that no page was pinned */ n = max(n, 0); if (n != n_pages) { @@ -551,7 +552,7 @@ static inline dma_addr_t vb2_dc_pfn_to_dma(struct device *dev, unsigned long pfn #endif static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr, - unsigned long size, int write) + unsigned long size, enum dma_data_direction dma_dir) { struct vb2_dc_conf *conf = alloc_ctx; struct vb2_dc_buf *buf; @@ -582,7 +583,7 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr, return ERR_PTR(-ENOMEM); buf->dev = conf->dev; - buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + buf->dma_dir = dma_dir; start = vaddr & PAGE_MASK; offset = vaddr & ~PAGE_MASK; @@ -618,7 +619,8 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr, } /* extract page list from userspace mapping */ - ret = vb2_dc_get_user_pages(start, pages, n_pages, vma, write); + ret = vb2_dc_get_user_pages(start, pages, n_pages, vma, + dma_dir == DMA_FROM_DEVICE); if (ret) { unsigned long pfn; if (vb2_dc_get_user_pfn(start, n_pages, vma, &pfn) == 0) { @@ -782,7 +784,7 @@ static void vb2_dc_detach_dmabuf(void *mem_priv) } static void *vb2_dc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf, - unsigned long size, int write) + unsigned long size, enum dma_data_direction dma_dir) { struct vb2_dc_conf *conf = alloc_ctx; struct vb2_dc_buf *buf; @@ -804,7 +806,7 @@ static void *vb2_dc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf, return dba; } - buf->dma_dir = write ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + buf->dma_dir = dma_dir; buf->size = size; buf->db_attach = dba; diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c index 9b163a440f89..6b54a14ee827 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c @@ -33,8 +33,8 @@ module_param(debug, int, 0644); struct vb2_dma_sg_buf { void *vaddr; struct page **pages; - int write; int offset; + enum dma_data_direction dma_dir; struct sg_table sg_table; size_t size; unsigned int num_pages; @@ -97,7 +97,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_fla return NULL; buf->vaddr = NULL; - buf->write = 0; + buf->dma_dir = DMA_NONE; buf->offset = 0; buf->size = size; /* size is already page aligned */ @@ -162,7 +162,8 @@ static inline int vma_is_io(struct vm_area_struct *vma) } static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr, - unsigned long size, int write) + unsigned long size, + enum dma_data_direction dma_dir) { struct vb2_dma_sg_buf *buf; unsigned long first, last; @@ -174,7 +175,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr, return NULL; buf->vaddr = NULL; - buf->write = write; + buf->dma_dir = dma_dir; buf->offset = vaddr & ~PAGE_MASK; buf->size = size; @@ -221,7 +222,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr, num_pages_from_user = get_user_pages(current, current->mm, vaddr & PAGE_MASK, buf->num_pages, - write, + buf->dma_dir == DMA_FROM_DEVICE, 1, /* force */ buf->pages, NULL); @@ -265,7 +266,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv) vm_unmap_ram(buf->vaddr, buf->num_pages); sg_free_table(&buf->sg_table); while (--i >= 0) { - if (buf->write) + if (buf->dma_dir == DMA_FROM_DEVICE) set_page_dirty_lock(buf->pages[i]); if (!vma_is_io(buf->vma)) put_page(buf->pages[i]); diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c index 313d9771b2bc..fc1eb45a6143 100644 --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c @@ -25,7 +25,7 @@ struct vb2_vmalloc_buf { void *vaddr; struct page **pages; struct vm_area_struct *vma; - int write; + enum dma_data_direction dma_dir; unsigned long size; unsigned int n_pages; atomic_t refcount; @@ -70,7 +70,8 @@ static void vb2_vmalloc_put(void *buf_priv) } static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr, - unsigned long size, int write) + unsigned long size, + enum dma_data_direction dma_dir) { struct vb2_vmalloc_buf *buf; unsigned long first, last; @@ -82,7 +83,7 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr, if (!buf) return NULL; - buf->write = write; + buf->dma_dir = dma_dir; offset = vaddr & ~PAGE_MASK; buf->size = size; @@ -107,7 +108,8 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr, /* current->mm->mmap_sem is taken by videobuf2 core */ n_pages = get_user_pages(current, current->mm, vaddr & PAGE_MASK, buf->n_pages, - write, 1, /* force */ + dma_dir == DMA_FROM_DEVICE, + 1, /* force */ buf->pages, NULL); if (n_pages != buf->n_pages) goto fail_get_user_pages; @@ -144,7 +146,7 @@ static void vb2_vmalloc_put_userptr(void *buf_priv) if (vaddr) vm_unmap_ram((void *)vaddr, buf->n_pages); for (i = 0; i < buf->n_pages; ++i) { - if (buf->write) + if (buf->dma_dir == DMA_FROM_DEVICE) set_page_dirty_lock(buf->pages[i]); put_page(buf->pages[i]); } @@ -240,7 +242,7 @@ static void vb2_vmalloc_detach_dmabuf(void *mem_priv) } static void *vb2_vmalloc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf, - unsigned long size, int write) + unsigned long size, enum dma_data_direction dma_dir) { struct vb2_vmalloc_buf *buf; @@ -252,7 +254,7 @@ static void *vb2_vmalloc_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf, return ERR_PTR(-ENOMEM); buf->dbuf = dbuf; - buf->write = write; + buf->dma_dir = dma_dir; buf->size = size; return buf; diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 70ace7cc6087..d607871749c7 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -87,14 +87,16 @@ struct vb2_mem_ops { struct dma_buf *(*get_dmabuf)(void *buf_priv, unsigned long flags); void *(*get_userptr)(void *alloc_ctx, unsigned long vaddr, - unsigned long size, int write); + unsigned long size, + enum dma_data_direction dma_dir); void (*put_userptr)(void *buf_priv); void (*prepare)(void *buf_priv); void (*finish)(void *buf_priv); void *(*attach_dmabuf)(void *alloc_ctx, struct dma_buf *dbuf, - unsigned long size, int write); + unsigned long size, + enum dma_data_direction dma_dir); void (*detach_dmabuf)(void *buf_priv); int (*map_dmabuf)(void *buf_priv); void (*unmap_dmabuf)(void *buf_priv); -- 2.20.1