From patchwork Thu Jan 5 10:41:58 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Semwal, Sumit" X-Patchwork-Id: 9372 Return-path: Envelope-to: mchehab@canuck.infradead.org Delivery-date: Thu, 05 Jan 2012 10:42:38 +0000 Received: from canuck.infradead.org [134.117.69.58] by gaivota with IMAP (fetchmail-6.3.20) for (single-drop); Thu, 05 Jan 2012 09:13:25 -0200 (BRST) Received: from casper.infradead.org ([2001:770:15f::2]) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1RikmM-00020S-Ct for mchehab@canuck.infradead.org; Thu, 05 Jan 2012 10:42:38 +0000 Received: from vger.kernel.org ([209.132.180.67]) by casper.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1RikmK-00011F-Ms; Thu, 05 Jan 2012 10:42:37 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756881Ab2AEKmf (ORCPT + 1 other); Thu, 5 Jan 2012 05:42:35 -0500 Received: from bear.ext.ti.com ([192.94.94.41]:47870 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755379Ab2AEKme (ORCPT ); Thu, 5 Jan 2012 05:42:34 -0500 Received: from dlep26.itg.ti.com ([157.170.170.121]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id q05AgSIJ024904; Thu, 5 Jan 2012 04:42:28 -0600 Received: from DFLE70.ent.ti.com (localhost [127.0.0.1]) by dlep26.itg.ti.com (8.13.8/8.13.8) with ESMTP id q05AgSCL027367; Thu, 5 Jan 2012 04:42:28 -0600 (CST) Received: from dlelxv23.itg.ti.com (172.17.1.198) by dfle70.ent.ti.com (128.247.5.40) with Microsoft SMTP Server id 14.1.323.3; Thu, 5 Jan 2012 04:42:28 -0600 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlelxv23.itg.ti.com (8.13.8/8.13.8) with ESMTP id q05AgSLd006999; Thu, 5 Jan 2012 04:42:28 -0600 Received: from localhost (a0876505ubnlt.apr.dhcp.ti.com [172.24.137.246]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id q05AgOW17119; Thu, 5 Jan 2012 04:42:25 -0600 (CST) From: Sumit Semwal To: , , CC: , , , , , , Sumit Semwal , Sumit Semwal Subject: [RFCv1 4/4] v4l:vb2: Add dma-contig allocator as dma_buf user Date: Thu, 5 Jan 2012 16:11:58 +0530 Message-ID: <1325760118-27997-5-git-send-email-sumit.semwal@ti.com> X-Mailer: git-send-email 1.7.5.4 In-Reply-To: <1325760118-27997-1-git-send-email-sumit.semwal@ti.com> References: <1325760118-27997-1-git-send-email-sumit.semwal@ti.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch makes changes for adding dma-contig as a dma_buf user. It provides function implementations for the {attach, detach, map, unmap}_dmabuf() mem_ops of DMABUF memory type. Signed-off-by: Sumit Semwal Signed-off-by: Sumit Semwal --- drivers/media/video/videobuf2-dma-contig.c | 125 ++++++++++++++++++++++++++++ 1 files changed, 125 insertions(+), 0 deletions(-) diff --git a/drivers/media/video/videobuf2-dma-contig.c b/drivers/media/video/videobuf2-dma-contig.c index f17ad98..e671371 100644 --- a/drivers/media/video/videobuf2-dma-contig.c +++ b/drivers/media/video/videobuf2-dma-contig.c @@ -13,6 +13,8 @@ #include #include #include +#include +#include #include #include @@ -27,6 +29,7 @@ struct vb2_dc_buf { dma_addr_t dma_addr; unsigned long size; struct vm_area_struct *vma; + struct dma_buf_attachment *db_attach; atomic_t refcount; struct vb2_vmarea_handler handler; }; @@ -37,6 +40,7 @@ static void *vb2_dma_contig_alloc(void *alloc_ctx, unsigned long size) { struct vb2_dc_conf *conf = alloc_ctx; struct vb2_dc_buf *buf; + /* TODO: add db_attach processing while adding DMABUF as exporter */ buf = kzalloc(sizeof *buf, GFP_KERNEL); if (!buf) @@ -106,6 +110,8 @@ static int vb2_dma_contig_mmap(void *buf_priv, struct vm_area_struct *vma) return -EINVAL; } + WARN_ON(buf->db_attach); + return vb2_mmap_pfn_range(vma, buf->dma_addr, buf->size, &vb2_common_vm_ops, &buf->handler); } @@ -148,6 +154,121 @@ static void vb2_dma_contig_put_userptr(void *mem_priv) kfree(buf); } +static int vb2_dma_contig_map_dmabuf(void *mem_priv, + enum dma_data_direction direction) +{ + struct vb2_dc_buf *buf = mem_priv; + struct dma_buf *dmabuf; + struct sg_table *sg; + + if (!buf || !buf->db_attach) { + printk(KERN_ERR "No dma buffer to pin\n"); + return -EINVAL; + } + + WARN_ON(buf->dma_addr); + + if (direction == DMA_NONE) { + printk(KERN_ERR "Incorrect DMA direction\n"); + return -EINVAL; + } + + dmabuf = buf->db_attach->dmabuf; + + /* get the associated scatterlist for this buffer */ + sg = dma_buf_map_attachment(buf->db_attach, direction); + + if (!sg) { + printk(KERN_ERR "Error getting dmabuf scatterlist\n"); + return -EINVAL; + } + + /* + * convert sglist to paddr: + * Assumption: for dma-contig, dmabuf would map to single entry + * Will return an error if it has more than one. + */ + if (sg->nents > 1) { + printk(KERN_ERR + "dmabuf scatterlist has more than 1 entry\n"); + return -EINVAL; + } + + buf->dma_addr = sg_dma_address(sg->sgl); + /* TODO: check the buffer size as per S_FMT */ + buf->size = sg_dma_len(sg->sgl); + + /* save this scatterlist in dmabuf for put_scatterlist */ + dmabuf->priv = sg; + + return 0; +} + +static void vb2_dma_contig_unmap_dmabuf(void *mem_priv) +{ + struct vb2_dc_buf *buf = mem_priv; + struct dma_buf *dmabuf; + struct sg_table *sg; + + if (!buf || !buf->db_attach) + return; + + WARN_ON(!buf->dma_addr); + + dmabuf = buf->db_attach->dmabuf; + sg = dmabuf->priv; + + /* Put the sg for this buffer */ + dma_buf_unmap_attachment(buf->db_attach, sg); + + buf->dma_addr = 0; + buf->size = 0; +} + +static void *vb2_dma_contig_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf) +{ + struct vb2_dc_conf *conf = alloc_ctx; + struct vb2_dc_buf *buf; + struct dma_buf_attachment *dba; + + buf = kzalloc(sizeof *buf, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + /* create attachment for the dmabuf with the user device */ + dba = dma_buf_attach(dbuf, conf->dev); + if (IS_ERR(dba)) { + printk(KERN_ERR "failed to attach dmabuf\n"); + kfree(buf); + return dba; + } + + buf->conf = conf; + buf->size = dba->dmabuf->size; + buf->db_attach = dba; + buf->dma_addr = 0; /* dma_addr is available only after map */ + + return buf; +} + +static void vb2_dma_contig_detach_dmabuf(void *mem_priv) +{ + struct vb2_dc_buf *buf = mem_priv; + + if (!buf) + return; + + if (buf->dma_addr) { + vb2_dma_contig_unmap_dmabuf(buf); + } + + /* detach this attachment */ + dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach); + buf->db_attach = NULL; + + kfree(buf); +} + const struct vb2_mem_ops vb2_dma_contig_memops = { .alloc = vb2_dma_contig_alloc, .put = vb2_dma_contig_put, @@ -156,6 +277,10 @@ const struct vb2_mem_ops vb2_dma_contig_memops = { .mmap = vb2_dma_contig_mmap, .get_userptr = vb2_dma_contig_get_userptr, .put_userptr = vb2_dma_contig_put_userptr, + .map_dmabuf = vb2_dma_contig_map_dmabuf, + .unmap_dmabuf = vb2_dma_contig_unmap_dmabuf, + .attach_dmabuf = vb2_dma_contig_attach_dmabuf, + .detach_dmabuf = vb2_dma_contig_detach_dmabuf, .num_users = vb2_dma_contig_num_users, }; EXPORT_SYMBOL_GPL(vb2_dma_contig_memops);