From patchwork Fri Sep 13 12:56:20 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 2883841 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 4C3319F1BF for ; Fri, 13 Sep 2013 12:58:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7541A202AB for ; Fri, 13 Sep 2013 12:58:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C74E202B8 for ; Fri, 13 Sep 2013 12:57:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754542Ab3IMM5v (ORCPT ); Fri, 13 Sep 2013 08:57:51 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:62593 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751847Ab3IMM5u (ORCPT ); Fri, 13 Sep 2013 08:57:50 -0400 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout4.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MT2009NTEO5X3S0@mailout4.samsung.com>; Fri, 13 Sep 2013 21:57:45 +0900 (KST) X-AuditID: cbfee61a-b7f7a6d00000235f-81-52330bc90191 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id 1E.7B.09055.9CB03325; Fri, 13 Sep 2013 21:57:45 +0900 (KST) Received: from amdc1344.digital.local ([106.116.147.32]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0MT200LY6EM52Y30@mmp1.samsung.com>; Fri, 13 Sep 2013 21:57:45 +0900 (KST) From: Sylwester Nawrocki To: linux-media@vger.kernel.org Cc: hverkuil@xs4all.nl, kyungmin.park@samsung.com, pawel@osciak.com, javier.martin@vista-silicon.com, m.szyprowski@samsung.com, shaik.ameer@samsung.com, arun.kk@samsung.com, k.debski@samsung.com, linux-samsung-soc@vger.kernel.org, Sylwester Nawrocki Subject: [PATCH RFC 1/7] V4L: Add mem2mem ioctl and file operation helpers Date: Fri, 13 Sep 2013 14:56:20 +0200 Message-id: <1379076986-10446-2-git-send-email-s.nawrocki@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1379076986-10446-1-git-send-email-s.nawrocki@samsung.com> References: <1379076986-10446-1-git-send-email-s.nawrocki@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrKLMWRmVeSWpSXmKPExsVy+t9jAd2T3MZBBp93qVp8PHWb1eLU5GdM Fsen7mO0+PH6ApvF2aY37BY9G7ayWsw4v4/JYu2Ru+wWU97+ZLc4/Kad1eLIw93sDtwej3+9 ZPPo27KK0ePzJjmPgzfb2DxOff3MHsAaxWWTkpqTWZZapG+XwJWx8rVtwWrTiiVzrrM2MJ7U 6WLk5JAQMJFY93E3M4QtJnHh3nq2LkYuDiGBRYwSczZuhnI6mCT6zjxiAqliEzCU6D3axwhi iwjISzzpvQFWxCwwg0nixbRuVpCEsICXRNfSDUA2BweLgKrEy1vpIGFeATeJ/RsfMIOEJQQU JOZMsgExOQXcJbZ9EwapEAKq+PH3AvMERt4FjAyrGEVTC5ILipPScw31ihNzi0vz0vWS83M3 MYID75nUDsaVDRaHGAU4GJV4eDtijIKEWBPLiitzDzFKcDArifDOugsU4k1JrKxKLcqPLyrN SS0+xCjNwaIkznug1TpQSCA9sSQ1OzW1ILUIJsvEwSnVwGj6yvnWsYLE36tvNnd+TLx1P0t5 5qLvdufL+3TXsy1Z2vLmPGt2Ta/q/A2tgS93sXmXcVtHJ5hKbLpcJqAicetvZF0vh+K0GTJ+ fBdsS/+HRm/TWt0V5ZC7Z5HiOpZjH81sbU9cnybtGsK0I87+zxkOKeN53x62+dVP2H1x3u5K 5mKesxVcD5RYijMSDbWYi4oTAfxBrpE4AgAA Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-7.8 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds ioctl helpers to the V4L2 mem-to-mem API, so we can avoid several ioctl handlers in the mem-to-mem video node drivers that are simply a pass-through to the v4l2_m2m_* calls. These helpers will only be useful for drivers that use same mutex for both OUTPUT and CAPTURE queue, which is the case for all currently in tree v4l2 m2m drivers. In order to use the helpers the driver are required to use struct v4l2_fh. Signed-off-by: Sylwester Nawrocki Signed-off-by: Kyugmin Park Acked-by: Hans Verkuil --- drivers/media/v4l2-core/v4l2-mem2mem.c | 110 ++++++++++++++++++++++++++++++++ include/media/v4l2-fh.h | 4 ++ include/media/v4l2-mem2mem.h | 22 +++++++ 3 files changed, 136 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c index 7c43712..dddad5b 100644 --- a/drivers/media/v4l2-core/v4l2-mem2mem.c +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c @@ -544,6 +544,8 @@ unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, if (m2m_ctx->m2m_dev->m2m_ops->unlock) m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv); + else if (m2m_ctx->q_lock) + mutex_unlock(m2m_ctx->q_lock); if (list_empty(&src_q->done_list)) poll_wait(file, &src_q->done_wq, wait); @@ -552,6 +554,8 @@ unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, if (m2m_ctx->m2m_dev->m2m_ops->lock) m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv); + else if (m2m_ctx->q_lock) + mutex_lock(m2m_ctx->q_lock); spin_lock_irqsave(&src_q->done_lock, flags); if (!list_empty(&src_q->done_list)) @@ -679,6 +683,13 @@ struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, if (ret) goto err; + /* + * If both queues use same mutex assign it as the common buffer + * queues lock to the m2m context. This lock is used in the + * v4l2_m2m_ioctl_* helpers. + */ + if (out_q_ctx->q.lock == cap_q_ctx->q.lock) + m2m_ctx->q_lock = out_q_ctx->q.lock; return m2m_ctx; err: @@ -726,3 +737,102 @@ void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb) } EXPORT_SYMBOL_GPL(v4l2_m2m_buf_queue); +/* Videobuf2 ioctl helpers */ + +int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv, + struct v4l2_requestbuffers *rb) +{ + struct v4l2_fh *fh = file->private_data; + return v4l2_m2m_reqbufs(file, fh->m2m_ctx, rb); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_reqbufs); + +int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv, + struct v4l2_buffer *buf) +{ + struct v4l2_fh *fh = file->private_data; + return v4l2_m2m_querybuf(file, fh->m2m_ctx, buf); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_querybuf); + +int v4l2_m2m_ioctl_qbuf(struct file *file, void *priv, + struct v4l2_buffer *buf) +{ + struct v4l2_fh *fh = file->private_data; + return v4l2_m2m_qbuf(file, fh->m2m_ctx, buf); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_qbuf); + +int v4l2_m2m_ioctl_dqbuf(struct file *file, void *priv, + struct v4l2_buffer *buf) +{ + struct v4l2_fh *fh = file->private_data; + return v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_dqbuf); + +int v4l2_m2m_ioctl_expbuf(struct file *file, void *priv, + struct v4l2_exportbuffer *eb) +{ + struct v4l2_fh *fh = file->private_data; + return v4l2_m2m_expbuf(file, fh->m2m_ctx, eb); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_expbuf); + +int v4l2_m2m_ioctl_streamon(struct file *file, void *priv, + enum v4l2_buf_type type) +{ + struct v4l2_fh *fh = file->private_data; + return v4l2_m2m_streamon(file, fh->m2m_ctx, type); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamon); + +int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv, + enum v4l2_buf_type type) +{ + struct v4l2_fh *fh = file->private_data; + return v4l2_m2m_streamoff(file, fh->m2m_ctx, type); +} +EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff); + +/* + * v4l2_file_operations helpers. It is assumed here same lock is used + * for the output and the capture buffer queue. + */ + +int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct v4l2_fh *fh = file->private_data; + struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx; + int ret; + + if (m2m_ctx->q_lock && mutex_lock_interruptible(m2m_ctx->q_lock)) + return -ERESTARTSYS; + + ret = v4l2_m2m_mmap(file, m2m_ctx, vma); + + if (m2m_ctx->q_lock) + mutex_unlock(m2m_ctx->q_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_fop_mmap); + +unsigned int v4l2_m2m_fop_poll(struct file *file, poll_table *wait) +{ + struct v4l2_fh *fh = file->private_data; + struct v4l2_m2m_ctx *m2m_ctx = fh->m2m_ctx; + unsigned int ret; + + if (m2m_ctx->q_lock) + mutex_lock(m2m_ctx->q_lock); + + ret = v4l2_m2m_poll(file, m2m_ctx, wait); + + if (m2m_ctx->q_lock) + mutex_unlock(m2m_ctx->q_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_m2m_fop_poll); + diff --git a/include/media/v4l2-fh.h b/include/media/v4l2-fh.h index a62ee18..d942f79 100644 --- a/include/media/v4l2-fh.h +++ b/include/media/v4l2-fh.h @@ -43,6 +43,10 @@ struct v4l2_fh { struct list_head available; /* Dequeueable event */ unsigned int navailable; u32 sequence; + +#if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV) + struct v4l2_m2m_ctx *m2m_ctx; +#endif }; /* diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h index 44542a2..2a0e489 100644 --- a/include/media/v4l2-mem2mem.h +++ b/include/media/v4l2-mem2mem.h @@ -64,6 +64,9 @@ struct v4l2_m2m_queue_ctx { }; struct v4l2_m2m_ctx { + /* optional cap/out vb2 queues lock */ + struct mutex *q_lock; + /* private: internal use only */ struct v4l2_m2m_dev *m2m_dev; @@ -229,5 +232,24 @@ static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx); } +/* v4l2 ioctl helpers */ + +int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv, + struct v4l2_requestbuffers *rb); +int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh, + struct v4l2_buffer *buf); +int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh, + struct v4l2_buffer *buf); +int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh, + struct v4l2_buffer *buf); +int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh, + struct v4l2_exportbuffer *eb); +int v4l2_m2m_ioctl_streamon(struct file *file, void *fh, + enum v4l2_buf_type type); +int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh, + enum v4l2_buf_type type); +int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma); +unsigned int v4l2_m2m_fop_poll(struct file *file, poll_table *wait); + #endif /* _MEDIA_V4L2_MEM2MEM_H */