From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932306AbcBAN3b (ORCPT ); Mon, 1 Feb 2016 08:29:31 -0500 Received: from mailout2.w1.samsung.com ([210.118.77.12]:38464 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752319AbcBAN33 (ORCPT ); Mon, 1 Feb 2016 08:29:29 -0500 X-AuditID: cbfec7f4-f79026d00000418a-26-56af5db6d014 Subject: Re: [PATCH v6 4/5] videobuf2-dc: Let drivers specify DMA attrs To: Douglas Anderson , linux@arm.linux.org.uk, mchehab@osg.samsung.com, robin.murphy@arm.com, tfiga@chromium.org References: <1452533428-12762-1-git-send-email-dianders@chromium.org> <1452533428-12762-5-git-send-email-dianders@chromium.org> Cc: pawel@osciak.com, Dmitry Torokhov , hch@infradead.org, kyungmin.park@samsung.com, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org From: Marek Szyprowski Message-id: <56AF5DB5.6000402@samsung.com> Date: Mon, 01 Feb 2016 14:29:25 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-version: 1.0 In-reply-to: <1452533428-12762-5-git-send-email-dianders@chromium.org> Content-type: text/plain; charset=utf-8; format=flowed Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpmkeLIzCtJLcpLzFFi42I5/e/4Vd1tsevDDO79sbE4u+wgm8XhRS8Y LU5PWMRkcbbpDbvF5V1z2Cx6Nmxltbh9mddi9bMKiylvf7JbHPzwhNXic+s/NgdujzXz1jB6 tDT3sHnMbrjI4rFz1l12j80rtDwe/3rJ5rGlH8jr27KK0ePzJrkAzigum5TUnMyy1CJ9uwSu jFPr7zMX/NKv+LhqMksD41y1LkZODgkBE4mms89ZIGwxiQv31rN1MXJxCAksZZT4sHc1C4Tz nFHi56pORpAqYQF3iRsPrrGCJEQEOhkl9m/6zwxR1cgocb13C9gsZoF1jBKfDwqC2GwChhJd b7vYQGxeAS2JM++bwSaxCKhKzD62ixnEFhWIkbjYeYQJokZQ4sfke2BzOAXcJA6u2cUKMdNM 4svLw1C2vMTmNW+ZJzAKzELSMgtJ2SwkZQsYmVcxiqaWJhcUJ6XnGuoVJ+YWl+al6yXn525i hETNlx2Mi49ZHWIU4GBU4uHdELkuTIg1say4MvcQowQHs5II70TL9WFCvCmJlVWpRfnxRaU5 qcWHGKU5WJTEeefueh8iJJCeWJKanZpakFoEk2Xi4JRqYFy+pLTJe561/zO7tAyh34zPVbO/ LNyntuvuYfXP0wQKbhve0w80s65fnLisS5x5fxfT/dfO699vkktfYvFMetr/natl1390b2M+ Epmxlld4c1iZZMnLb1OVpt4wXuFz/fmm3nPhPteckwTPb+OavlZW6va93R6vbU+JTrPblHqv 1X5nTs23pXZKLMUZiYZazEXFiQCjsrZZlgIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On 2016-01-11 18:30, Douglas Anderson wrote: > From: Tomasz Figa > > DMA allocations might be subject to certain reqiurements specific to the > hardware using the buffers, such as availability of kernel mapping (for > contents fix-ups in the driver). The only entity that knows them is the > driver, so it must share this knowledge with vb2-dc. > > This patch extends the alloc_ctx initialization interface to let the > driver specify DMA attrs, which are then stored inside the allocation > context and will be used for all allocations with that context. > > As a side effect, all dma_*_coherent() calls are turned into > dma_*_attrs() calls, because the attributes need to be carried over > through all DMA operations. > > Signed-off-by: Tomasz Figa > Signed-off-by: Douglas Anderson Acked-by: Marek Szyprowski > --- > Changes in v6: None > Changes in v5: > - Let drivers specify DMA attrs new for v5 > > Changes in v4: None > Changes in v3: None > Changes in v2: None > > drivers/media/v4l2-core/videobuf2-dma-contig.c | 33 +++++++++++++++++--------- > include/media/videobuf2-dma-contig.h | 11 ++++++++- > 2 files changed, 32 insertions(+), 12 deletions(-) > > diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c > index c33127284cfe..5361197f3e57 100644 > --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c > +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c > @@ -23,13 +23,16 @@ > > struct vb2_dc_conf { > struct device *dev; > + struct dma_attrs attrs; > }; > > struct vb2_dc_buf { > struct device *dev; > void *vaddr; > unsigned long size; > + void *cookie; > dma_addr_t dma_addr; > + struct dma_attrs attrs; > enum dma_data_direction dma_dir; > struct sg_table *dma_sgt; > struct frame_vector *vec; > @@ -131,7 +134,8 @@ static void vb2_dc_put(void *buf_priv) > sg_free_table(buf->sgt_base); > kfree(buf->sgt_base); > } > - dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->dma_addr); > + dma_free_attrs(buf->dev, buf->size, buf->cookie, buf->dma_addr, > + &buf->attrs); > put_device(buf->dev); > kfree(buf); > } > @@ -147,14 +151,18 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size, > if (!buf) > return ERR_PTR(-ENOMEM); > > - buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr, > - GFP_KERNEL | gfp_flags); > - if (!buf->vaddr) { > + buf->attrs = conf->attrs; > + buf->cookie = dma_alloc_attrs(dev, size, &buf->dma_addr, > + GFP_KERNEL | gfp_flags, &buf->attrs); > + if (!buf->cookie) { > dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size); > kfree(buf); > return ERR_PTR(-ENOMEM); > } > > + if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &buf->attrs)) > + buf->vaddr = buf->cookie; > + > /* Prevent the device from being released while the buffer is used */ > buf->dev = get_device(dev); > buf->size = size; > @@ -185,8 +193,8 @@ static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma) > */ > vma->vm_pgoff = 0; > > - ret = dma_mmap_coherent(buf->dev, vma, buf->vaddr, > - buf->dma_addr, buf->size); > + ret = dma_mmap_attrs(buf->dev, vma, buf->cookie, > + buf->dma_addr, buf->size, &buf->attrs); > > if (ret) { > pr_err("Remapping memory failed, error: %d\n", ret); > @@ -329,7 +337,7 @@ static void *vb2_dc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum) > { > struct vb2_dc_buf *buf = dbuf->priv; > > - return buf->vaddr + pgnum * PAGE_SIZE; > + return buf->vaddr ? buf->vaddr + pgnum * PAGE_SIZE : NULL; > } > > static void *vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf) > @@ -368,8 +376,8 @@ static struct sg_table *vb2_dc_get_base_sgt(struct vb2_dc_buf *buf) > return NULL; > } > > - ret = dma_get_sgtable(buf->dev, sgt, buf->vaddr, buf->dma_addr, > - buf->size); > + ret = dma_get_sgtable_attrs(buf->dev, sgt, buf->cookie, buf->dma_addr, > + buf->size, &buf->attrs); > if (ret < 0) { > dev_err(buf->dev, "failed to get scatterlist from DMA API\n"); > kfree(sgt); > @@ -721,7 +729,8 @@ const struct vb2_mem_ops vb2_dma_contig_memops = { > }; > EXPORT_SYMBOL_GPL(vb2_dma_contig_memops); > > -void *vb2_dma_contig_init_ctx(struct device *dev) > +void *vb2_dma_contig_init_ctx_attrs(struct device *dev, > + struct dma_attrs *attrs) > { > struct vb2_dc_conf *conf; > > @@ -730,10 +739,12 @@ void *vb2_dma_contig_init_ctx(struct device *dev) > return ERR_PTR(-ENOMEM); > > conf->dev = dev; > + if (attrs) > + conf->attrs = *attrs; > > return conf; > } > -EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx); > +EXPORT_SYMBOL_GPL(vb2_dma_contig_init_ctx_attrs); > > void vb2_dma_contig_cleanup_ctx(void *alloc_ctx) > { > diff --git a/include/media/videobuf2-dma-contig.h b/include/media/videobuf2-dma-contig.h > index c33dfa69d7ab..2087c9a68be3 100644 > --- a/include/media/videobuf2-dma-contig.h > +++ b/include/media/videobuf2-dma-contig.h > @@ -16,6 +16,8 @@ > #include > #include > > +struct dma_attrs; > + > static inline dma_addr_t > vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no) > { > @@ -24,7 +26,14 @@ vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no) > return *addr; > } > > -void *vb2_dma_contig_init_ctx(struct device *dev); > +void *vb2_dma_contig_init_ctx_attrs(struct device *dev, > + struct dma_attrs *attrs); > + > +static inline void *vb2_dma_contig_init_ctx(struct device *dev) > +{ > + return vb2_dma_contig_init_ctx_attrs(dev, NULL); > +} > + > void vb2_dma_contig_cleanup_ctx(void *alloc_ctx); > > extern const struct vb2_mem_ops vb2_dma_contig_memops; Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland