From patchwork Tue Aug 14 15:34:33 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomasz Stanislawski X-Patchwork-Id: 10732 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id B65ED23F34 for ; Tue, 14 Aug 2012 15:35:47 +0000 (UTC) Received: from mail-wi0-f182.google.com (mail-wi0-f182.google.com [209.85.212.182]) by fiordland.canonical.com (Postfix) with ESMTP id AB52DA18A29 for ; Tue, 14 Aug 2012 15:35:47 +0000 (UTC) Received: by wibhq12 with SMTP id hq12so443489wib.17 for ; Tue, 14 Aug 2012 08:35:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-forwarded-to:x-forwarded-for:delivered-to:received-spf:x-auditid :from:to:date:message-id:x-mailer:in-reply-to:references :x-brightmail-tracker:x-tm-as-mml:cc:subject:x-beenthere :x-mailman-version:precedence:list-id:list-unsubscribe:list-archive :list-post:list-help:list-subscribe:mime-version:content-type :content-transfer-encoding:sender:errors-to:x-gm-message-state; bh=lHdeUupWrF5mzLY9LJ1VYi/2h+4WwFihZa8kfoSSKco=; b=mJO5pmb2W/BqxG4kh0WDaMy2H8Pse8+fjRGC82FkwHxA+wzo9YsvrxGHT7LWVryPSo 6R6uiIAgEJ1lQQKh6GKyc9Uz9SC+3HH5V8+rYW1mOErKpwvIx8F7n2RxdQLe8zzMuLHV VZ3Pu0Y3Sog/xlCG9IPp0sXtdNBOSa3uAY8BR2TBt6VYitIueo6TvebO/AWly+ZBD3W6 pSE57IZBUZDnEo2ky+PFi2mcNSYbVucP90E5sRO7zTUIAdNq6FzGwKsuXIBH58slItgQ 8VuJ7/lR8RtvQhootnEJ/uBGh/bAMuvB96jScgdOFhc9bXs7kaFho1fqrvJr+BR3VOj7 5S6w== Received: by 10.50.57.168 with SMTP id j8mr12363795igq.16.1344958546779; Tue, 14 Aug 2012 08:35:46 -0700 (PDT) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.50.184.200 with SMTP id ew8csp20556igc; Tue, 14 Aug 2012 08:35:45 -0700 (PDT) Received: by 10.180.78.135 with SMTP id b7mr28844032wix.11.1344958544806; Tue, 14 Aug 2012 08:35:44 -0700 (PDT) Received: from mombin.canonical.com (mombin.canonical.com. [91.189.95.16]) by mx.google.com with ESMTP id a6si26879391wix.26.2012.08.14.08.35.43; Tue, 14 Aug 2012 08:35:44 -0700 (PDT) Received-SPF: neutral (google.com: 91.189.95.16 is neither permitted nor denied by best guess record for domain of linaro-mm-sig-bounces@lists.linaro.org) client-ip=91.189.95.16; Authentication-Results: mx.google.com; spf=neutral (google.com: 91.189.95.16 is neither permitted nor denied by best guess record for domain of linaro-mm-sig-bounces@lists.linaro.org) smtp.mail=linaro-mm-sig-bounces@lists.linaro.org Received: from localhost ([127.0.0.1] helo=mombin.canonical.com) by mombin.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1T1J9i-00083r-9O; Tue, 14 Aug 2012 15:35:42 +0000 Received: from mailout2.samsung.com ([203.254.224.25]) by mombin.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1T1J9g-00083g-Ai for linaro-mm-sig@lists.linaro.org; Tue, 14 Aug 2012 15:35:41 +0000 Received: from epcpsbgm2.samsung.com (mailout2.samsung.com [203.254.224.25]) by mailout2.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0M8R00J5O4NEDVJ0@mailout2.samsung.com> for linaro-mm-sig@lists.linaro.org; Wed, 15 Aug 2012 00:35:39 +0900 (KST) X-AuditID: cbfee61b-b7faf6d00000476a-56-502a704abdcd Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id A7.B9.18282.A407A205; Wed, 15 Aug 2012 00:35:39 +0900 (KST) Received: from mcdsrvbld02.digital.local ([106.116.37.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0M8R004J44MBC810@mmp1.samsung.com> for linaro-mm-sig@lists.linaro.org; Wed, 15 Aug 2012 00:35:38 +0900 (KST) From: Tomasz Stanislawski To: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Date: Tue, 14 Aug 2012 17:34:33 +0200 Message-id: <1344958496-9373-4-git-send-email-t.stanislaws@samsung.com> X-Mailer: git-send-email 1.7.10 In-reply-to: <1344958496-9373-1-git-send-email-t.stanislaws@samsung.com> References: <1344958496-9373-1-git-send-email-t.stanislaws@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrIJMWRmVeSWpSXmKPExsVy+t9jAV3vAq0Agw9HWSy+XHnI5MDocfvf Y+YAxigum5TUnMyy1CJ9uwSujHNd39kLLqdVLNsl0MB4I7CLkZNDQsBE4kbTPVYIW0ziwr31 bF2MXBxCAosYJVZtWMII4axlknj+ZwYjSBUbUMexJZ/BbBEBB4nTd2cxgxQxC7xiltg+ZS3Q KA4OYQEvia9dyiA1LAKqElv6JrCD2LwC7hJ7fzayQ2yTl3h6v48NxOYU8JB4uambEaRVCKhm 4U//CYy8CxgZVjGKphYkFxQnpeca6RUn5haX5qXrJefnbmIEe/yZ9A7GVQ0WhxgFOBiVeHgL EzUDhFgTy4orcw8xSnAwK4nwFgVpBQjxpiRWVqUW5ccXleakFh9ilOZgURLnNfH+6i8kkJ5Y kpqdmlqQWgSTZeLglGpgzDizpHBvIdvSSOm3NfG/d7Zv8/i48WyYDJ9Zxayb4moMOzvcL14T mtFmcPbZ6uM/Vy1/abdLrm612paFRwVlJ0x2a8+44xk2s1op1nfRiv3pMwVzmi7fC9B8t3r2 +zNr/7A++/Wr6bTHDtO1F8OZr17R2Vp0R6ik8vy3U79272eqeZ51qXaujKwSS3FGoqEWc1Fx IgC3/4Td9AEAAA== X-TM-AS-MML: No Cc: k.debski@samsung.com, pawel@osciak.com, sumit.semwal@ti.com, mchehab@redhat.com, robdclark@gmail.com, linaro-mm-sig@lists.linaro.org, kyungmin.park@samsung.com, dmitriyz@google.com, laurent.pinchart@ideasonboard.com, s.nawrocki@samsung.com, airlied@redhat.com, remi@remlab.net, g.liakhovetski@gmx.de Subject: [Linaro-mm-sig] [PATCHv8 03/26] v4l: vb2: add support for shared buffer (dma_buf) X-BeenThere: linaro-mm-sig@lists.linaro.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: "Unified memory management interest group." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linaro-mm-sig-bounces@lists.linaro.org Errors-To: linaro-mm-sig-bounces@lists.linaro.org X-Gm-Message-State: ALoCoQkFQRG30xzWgDI5Pe5VtDJonASRaRUv66Z7qb5xhivdki8nyd/b1XmKq6NqDktjhVFrg/pe From: Sumit Semwal This patch adds support for DMABUF memory type in videobuf2. It calls relevant APIs of dma_buf for v4l reqbuf / qbuf / dqbuf operations. For this version, the support is for videobuf2 as a user of the shared buffer; so the allocation of the buffer is done outside of V4L2. [A sample allocator of dma-buf shared buffer is given at [1]] [1]: Rob Clark's DRM: https://github.com/robclark/kernel-omap4/commits/drmplane-dmabuf Signed-off-by: Tomasz Stanislawski [original work in the PoC for buffer sharing] Signed-off-by: Sumit Semwal Signed-off-by: Sumit Semwal Acked-by: Laurent Pinchart --- drivers/media/video/videobuf2-core.c | 197 +++++++++++++++++++++++++++++++++- include/media/videobuf2-core.h | 27 +++++ 2 files changed, 221 insertions(+), 3 deletions(-) diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c index 4da3df6..a5d5081 100644 --- a/drivers/media/video/videobuf2-core.c +++ b/drivers/media/video/videobuf2-core.c @@ -109,6 +109,36 @@ static void __vb2_buf_userptr_put(struct vb2_buffer *vb) } /** + * __vb2_plane_dmabuf_put() - release memory associated with + * a DMABUF shared plane + */ +static void __vb2_plane_dmabuf_put(struct vb2_queue *q, struct vb2_plane *p) +{ + if (!p->mem_priv) + return; + + if (p->dbuf_mapped) + call_memop(q, unmap_dmabuf, p->mem_priv); + + call_memop(q, detach_dmabuf, p->mem_priv); + dma_buf_put(p->dbuf); + memset(p, 0, sizeof(*p)); +} + +/** + * __vb2_buf_dmabuf_put() - release memory associated with + * a DMABUF shared buffer + */ +static void __vb2_buf_dmabuf_put(struct vb2_buffer *vb) +{ + struct vb2_queue *q = vb->vb2_queue; + unsigned int plane; + + for (plane = 0; plane < vb->num_planes; ++plane) + __vb2_plane_dmabuf_put(q, &vb->planes[plane]); +} + +/** * __setup_offsets() - setup unique offsets ("cookies") for every plane in * every buffer on the queue */ @@ -230,6 +260,8 @@ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) /* Free MMAP buffers or release USERPTR buffers */ if (q->memory == V4L2_MEMORY_MMAP) __vb2_buf_mem_free(vb); + else if (q->memory == V4L2_MEMORY_DMABUF) + __vb2_buf_dmabuf_put(vb); else __vb2_buf_userptr_put(vb); } @@ -352,6 +384,12 @@ static int __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) */ memcpy(b->m.planes, vb->v4l2_planes, b->length * sizeof(struct v4l2_plane)); + + if (q->memory == V4L2_MEMORY_DMABUF) { + unsigned int plane; + for (plane = 0; plane < vb->num_planes; ++plane) + b->m.planes[plane].m.fd = 0; + } } else { /* * We use length and offset in v4l2_planes array even for @@ -363,6 +401,8 @@ static int __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) b->m.offset = vb->v4l2_planes[0].m.mem_offset; else if (q->memory == V4L2_MEMORY_USERPTR) b->m.userptr = vb->v4l2_planes[0].m.userptr; + else if (q->memory == V4L2_MEMORY_DMABUF) + b->m.fd = 0; } /* @@ -454,13 +494,28 @@ static int __verify_mmap_ops(struct vb2_queue *q) } /** + * __verify_dmabuf_ops() - verify that all memory operations required for + * DMABUF queue type have been provided + */ +static int __verify_dmabuf_ops(struct vb2_queue *q) +{ + if (!(q->io_modes & VB2_DMABUF) || !q->mem_ops->attach_dmabuf || + !q->mem_ops->detach_dmabuf || !q->mem_ops->map_dmabuf || + !q->mem_ops->unmap_dmabuf) + return -EINVAL; + + return 0; +} + +/** * __verify_memory_type() - Check whether the memory type and buffer type * passed to a buffer operation are compatible with the queue. */ static int __verify_memory_type(struct vb2_queue *q, enum v4l2_memory memory, enum v4l2_buf_type type) { - if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR) { + if (memory != V4L2_MEMORY_MMAP && memory != V4L2_MEMORY_USERPTR && + memory != V4L2_MEMORY_DMABUF) { dprintk(1, "reqbufs: unsupported memory type\n"); return -EINVAL; } @@ -484,6 +539,11 @@ static int __verify_memory_type(struct vb2_queue *q, return -EINVAL; } + if (memory == V4L2_MEMORY_DMABUF && __verify_dmabuf_ops(q)) { + dprintk(1, "reqbufs: DMABUF for current setup unsupported\n"); + return -EINVAL; + } + /* * Place the busy tests at the end: -EBUSY can be ignored when * create_bufs is called with count == 0, but count == 0 should still @@ -853,6 +913,11 @@ static int __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, b->m.planes[plane].length; } } + if (b->memory == V4L2_MEMORY_DMABUF) { + for (plane = 0; plane < vb->num_planes; ++plane) + v4l2_planes[plane].m.fd = + b->m.planes[plane].m.fd; + } } else { /* * Single-planar buffers do not use planes array, @@ -867,6 +932,10 @@ static int __fill_vb2_buffer(struct vb2_buffer *vb, const struct v4l2_buffer *b, v4l2_planes[0].m.userptr = b->m.userptr; v4l2_planes[0].length = b->length; } + + if (b->memory == V4L2_MEMORY_DMABUF) + v4l2_planes[0].m.fd = b->m.fd; + } vb->v4l2_buf.field = b->field; @@ -970,6 +1039,100 @@ static int __qbuf_mmap(struct vb2_buffer *vb, const struct v4l2_buffer *b) } /** + * __qbuf_dmabuf() - handle qbuf of a DMABUF buffer + */ +static int __qbuf_dmabuf(struct vb2_buffer *vb, const struct v4l2_buffer *b) +{ + struct v4l2_plane planes[VIDEO_MAX_PLANES]; + struct vb2_queue *q = vb->vb2_queue; + void *mem_priv; + unsigned int plane; + int ret; + int write = !V4L2_TYPE_IS_OUTPUT(q->type); + + /* Verify and copy relevant information provided by the userspace */ + ret = __fill_vb2_buffer(vb, b, planes); + if (ret) + return ret; + + for (plane = 0; plane < vb->num_planes; ++plane) { + struct dma_buf *dbuf = dma_buf_get(planes[plane].m.fd); + + if (IS_ERR_OR_NULL(dbuf)) { + dprintk(1, "qbuf: invalid dmabuf fd for plane %d\n", + plane); + ret = -EINVAL; + goto err; + } + + /* use dmabuf's size as a plane length */ + planes[plane].length = dbuf->size; + + /* Skip the plane if already verified */ + if (dbuf == vb->planes[plane].dbuf) { + dma_buf_put(dbuf); + continue; + } + + dprintk(1, "qbuf: buffer for plane %d changed\n", plane); + + /* Release previously acquired memory if present */ + __vb2_plane_dmabuf_put(q, &vb->planes[plane]); + + /* Acquire each plane's memory */ + mem_priv = call_memop(q, attach_dmabuf, q->alloc_ctx[plane], + dbuf, q->plane_sizes[plane], write); + if (IS_ERR(mem_priv)) { + dprintk(1, "qbuf: failed to attach dmabuf\n"); + ret = PTR_ERR(mem_priv); + dma_buf_put(dbuf); + goto err; + } + + vb->planes[plane].dbuf = dbuf; + vb->planes[plane].mem_priv = mem_priv; + } + + /* TODO: This pins the buffer(s) with dma_buf_map_attachment()).. but + * really we want to do this just before the DMA, not while queueing + * the buffer(s).. + */ + for (plane = 0; plane < vb->num_planes; ++plane) { + ret = call_memop(q, map_dmabuf, vb->planes[plane].mem_priv); + if (ret) { + dprintk(1, "qbuf: failed to map dmabuf for plane %d\n", + plane); + goto err; + } + vb->planes[plane].dbuf_mapped = 1; + } + + /* + * Call driver-specific initialization on the newly acquired buffer, + * if provided. + */ + ret = call_qop(q, buf_init, vb); + if (ret) { + dprintk(1, "qbuf: buffer initialization failed\n"); + goto err; + } + + /* + * Now that everything is in order, copy relevant information + * provided by userspace. + */ + for (plane = 0; plane < vb->num_planes; ++plane) + vb->v4l2_planes[plane] = planes[plane]; + + return 0; +err: + /* In case of errors, release planes that were already acquired */ + __vb2_buf_dmabuf_put(vb); + + return ret; +} + +/** * __enqueue_in_driver() - enqueue a vb2_buffer in driver for processing */ static void __enqueue_in_driver(struct vb2_buffer *vb) @@ -993,6 +1156,9 @@ static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b) case V4L2_MEMORY_USERPTR: ret = __qbuf_userptr(vb, b); break; + case V4L2_MEMORY_DMABUF: + ret = __qbuf_dmabuf(vb, b); + break; default: WARN(1, "Invalid queue type\n"); ret = -EINVAL; @@ -1301,6 +1467,30 @@ int vb2_wait_for_all_buffers(struct vb2_queue *q) EXPORT_SYMBOL_GPL(vb2_wait_for_all_buffers); /** + * __vb2_dqbuf() - bring back the buffer to the DEQUEUED state + */ +static void __vb2_dqbuf(struct vb2_buffer *vb) +{ + struct vb2_queue *q = vb->vb2_queue; + unsigned int i; + + /* nothing to do if the buffer is already dequeued */ + if (vb->state == VB2_BUF_STATE_DEQUEUED) + return; + + vb->state = VB2_BUF_STATE_DEQUEUED; + + /* unmap DMABUF buffer */ + if (q->memory == V4L2_MEMORY_DMABUF) + for (i = 0; i < vb->num_planes; ++i) { + if (!vb->planes[i].dbuf_mapped) + continue; + call_memop(q, unmap_dmabuf, vb->planes[i].mem_priv); + vb->planes[i].dbuf_mapped = 0; + } +} + +/** * vb2_dqbuf() - Dequeue a buffer to the userspace * @q: videobuf2 queue * @b: buffer structure passed from userspace to vidioc_dqbuf handler @@ -1364,11 +1554,12 @@ int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking) __fill_v4l2_buffer(vb, b); /* Remove from videobuf queue */ list_del(&vb->queued_entry); + /* go back to dequeued state */ + __vb2_dqbuf(vb); dprintk(1, "dqbuf of buffer %d, with state %d\n", vb->v4l2_buf.index, vb->state); - vb->state = VB2_BUF_STATE_DEQUEUED; return 0; } EXPORT_SYMBOL_GPL(vb2_dqbuf); @@ -1407,7 +1598,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q) * Reinitialize all buffers for next use. */ for (i = 0; i < q->num_buffers; ++i) - q->bufs[i]->state = VB2_BUF_STATE_DEQUEUED; + __vb2_dqbuf(q->bufs[i]); } /** diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 8dd9b6c..84f11f2 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -16,6 +16,7 @@ #include #include #include +#include struct vb2_alloc_ctx; struct vb2_fileio_data; @@ -41,6 +42,20 @@ struct vb2_fileio_data; * argument to other ops in this structure * @put_userptr: inform the allocator that a USERPTR buffer will no longer * be used + * @attach_dmabuf: attach a shared struct dma_buf for a hardware operation; + * used for DMABUF memory types; alloc_ctx is the alloc context + * dbuf is the shared dma_buf; returns NULL on failure; + * allocator private per-buffer structure on success; + * this needs to be used for further accesses to the buffer + * @detach_dmabuf: inform the exporter of the buffer that the current DMABUF + * buffer is no longer used; the buf_priv argument is the + * allocator private per-buffer structure previously returned + * from the attach_dmabuf callback + * @map_dmabuf: request for access to the dmabuf from allocator; the allocator + * of dmabuf is informed that this driver is going to use the + * dmabuf + * @unmap_dmabuf: releases access control to the dmabuf - allocator is notified + * that this driver is done using the dmabuf for now * @vaddr: return a kernel virtual address to a given memory buffer * associated with the passed private structure or NULL if no * such mapping exists @@ -56,6 +71,8 @@ struct vb2_fileio_data; * Required ops for USERPTR types: get_userptr, put_userptr. * Required ops for MMAP types: alloc, put, num_users, mmap. * Required ops for read/write access types: alloc, put, num_users, vaddr + * Required ops for DMABUF types: attach_dmabuf, detach_dmabuf, map_dmabuf, + * unmap_dmabuf. */ struct vb2_mem_ops { void *(*alloc)(void *alloc_ctx, unsigned long size); @@ -65,6 +82,12 @@ struct vb2_mem_ops { unsigned long size, int write); void (*put_userptr)(void *buf_priv); + void *(*attach_dmabuf)(void *alloc_ctx, struct dma_buf *dbuf, + unsigned long size, int write); + void (*detach_dmabuf)(void *buf_priv); + int (*map_dmabuf)(void *buf_priv); + void (*unmap_dmabuf)(void *buf_priv); + void *(*vaddr)(void *buf_priv); void *(*cookie)(void *buf_priv); @@ -75,6 +98,8 @@ struct vb2_mem_ops { struct vb2_plane { void *mem_priv; + struct dma_buf *dbuf; + unsigned int dbuf_mapped; }; /** @@ -83,12 +108,14 @@ struct vb2_plane { * @VB2_USERPTR: driver supports USERPTR with streaming API * @VB2_READ: driver supports read() style access * @VB2_WRITE: driver supports write() style access + * @VB2_DMABUF: driver supports DMABUF with streaming API */ enum vb2_io_modes { VB2_MMAP = (1 << 0), VB2_USERPTR = (1 << 1), VB2_READ = (1 << 2), VB2_WRITE = (1 << 3), + VB2_DMABUF = (1 << 4), }; /**