From patchwork Wed Aug 24 10:22:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 12953210 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B023DC32793 for ; Wed, 24 Aug 2022 10:26:25 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D730F10E0BF; Wed, 24 Aug 2022 10:26:22 +0000 (UTC) Received: from madras.collabora.co.uk (madras.collabora.co.uk [46.235.227.172]) by gabe.freedesktop.org (Postfix) with ESMTPS id EAE6310E668; Wed, 24 Aug 2022 10:24:13 +0000 (UTC) Received: from dimapc.. (109-252-119-13.nat.spd-mgts.ru [109.252.119.13]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dmitry.osipenko) by madras.collabora.co.uk (Postfix) with ESMTPSA id A2B0E6601E8F; Wed, 24 Aug 2022 11:23:56 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1661336639; bh=Vzf7z+h30Su34uQUtrr1r2bCXml+/Rvk8BJL7Roib7Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nAXirMA6kjcky3QcUTCGs/MFMl27zgGe60TbMsZ/bhl6lrWZ4pdRYd6jdEtAk1Q9G JuGCTjhrX8clKppg8XC02jrK1gQ00VNPhSXZanM6cR5H8vvM94MLPA+0gTnqcqy7mV 8aK01zsk4HnLeL9Ve+KZ2JgnZRCqN8yiiHU3pMnqv1lNnH3y3gfg5f3sJi1f6BVNEN 2GEYfNzFCWAA4A6t2iW3uCNz5ekBdc6e/ifF19t0ccNV/SQhayiRp2ZNGNC805UPsa cwiZGH2QzWXzhBh560ppDCx1y8CuumvwKVOfGQ5Kz56i8eVjl2DI4seBcS8r6T3UUW cSLEmcJGiGY0g== From: Dmitry Osipenko To: David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Daniel Vetter , Daniel Almeida , Gert Wollny , Gustavo Padovan , Daniel Stone , Tomeu Vizoso , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Rob Clark , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , "Pan, Xinhui" , Thierry Reding , Tomasz Figa , Marek Szyprowski , Mauro Carvalho Chehab , Alex Deucher , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , =?utf-8?q?Thomas_Hellstr?= =?utf-8?q?=C3=B6m?= , Qiang Yu Subject: [PATCH v3 8/9] media: videobuf2: Stop using internal dma-buf lock Date: Wed, 24 Aug 2022 13:22:47 +0300 Message-Id: <20220824102248.91964-9-dmitry.osipenko@collabora.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220824102248.91964-1-dmitry.osipenko@collabora.com> References: <20220824102248.91964-1-dmitry.osipenko@collabora.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lima@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-arm-msm@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, virtualization@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, Dmitry Osipenko , kernel@collabora.com, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" All drivers that use dma-bufs have been moved to the updated locking specification and now dma-buf reservation is guaranteed to be locked by importers during the mapping operations. There is no need to take the internal dma-buf lock anymore. Remove locking from the videobuf2 memory allocators. Acked-by: Tomasz Figa Signed-off-by: Dmitry Osipenko Acked-by: Hans Verkuil --- drivers/media/common/videobuf2/videobuf2-dma-contig.c | 11 +---------- drivers/media/common/videobuf2/videobuf2-dma-sg.c | 11 +---------- drivers/media/common/videobuf2/videobuf2-vmalloc.c | 11 +---------- 3 files changed, 3 insertions(+), 30 deletions(-) diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c index de762dbdaf78..2c69bf0470e7 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c @@ -382,18 +382,12 @@ static struct sg_table *vb2_dc_dmabuf_ops_map( 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 */ - struct mutex *lock = &db_attach->dmabuf->lock; struct sg_table *sgt; - mutex_lock(lock); - sgt = &attach->sgt; /* return previously mapped sg table */ - if (attach->dma_dir == dma_dir) { - mutex_unlock(lock); + if (attach->dma_dir == dma_dir) return sgt; - } /* release any previous cache */ if (attach->dma_dir != DMA_NONE) { @@ -409,14 +403,11 @@ static struct sg_table *vb2_dc_dmabuf_ops_map( if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, DMA_ATTR_SKIP_CPU_SYNC)) { pr_err("failed to map scatterlist\n"); - mutex_unlock(lock); return ERR_PTR(-EIO); } attach->dma_dir = dma_dir; - mutex_unlock(lock); - return sgt; } diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c index 39e11600304a..e63e718c0bf7 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c @@ -424,18 +424,12 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map( struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) { struct vb2_dma_sg_attachment *attach = db_attach->priv; - /* stealing dmabuf mutex to serialize map/unmap operations */ - struct mutex *lock = &db_attach->dmabuf->lock; struct sg_table *sgt; - mutex_lock(lock); - sgt = &attach->sgt; /* return previously mapped sg table */ - if (attach->dma_dir == dma_dir) { - mutex_unlock(lock); + if (attach->dma_dir == dma_dir) return sgt; - } /* release any previous cache */ if (attach->dma_dir != DMA_NONE) { @@ -446,14 +440,11 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map( /* mapping to the client with new direction */ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) { pr_err("failed to map scatterlist\n"); - mutex_unlock(lock); return ERR_PTR(-EIO); } attach->dma_dir = dma_dir; - mutex_unlock(lock); - return sgt; } diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c index 7831bf545874..41db707e43a4 100644 --- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c +++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c @@ -267,18 +267,12 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map( struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir) { struct vb2_vmalloc_attachment *attach = db_attach->priv; - /* stealing dmabuf mutex to serialize map/unmap operations */ - struct mutex *lock = &db_attach->dmabuf->lock; struct sg_table *sgt; - mutex_lock(lock); - sgt = &attach->sgt; /* return previously mapped sg table */ - if (attach->dma_dir == dma_dir) { - mutex_unlock(lock); + if (attach->dma_dir == dma_dir) return sgt; - } /* release any previous cache */ if (attach->dma_dir != DMA_NONE) { @@ -289,14 +283,11 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map( /* mapping to the client with new direction */ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) { pr_err("failed to map scatterlist\n"); - mutex_unlock(lock); return ERR_PTR(-EIO); } attach->dma_dir = dma_dir; - mutex_unlock(lock); - return sgt; }