From patchwork Mon Mar 2 04:12:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergey Senozhatsky X-Patchwork-Id: 61869 X-Patchwork-Delegate: hverkuil@xs4all.nl Received: from vger.kernel.org ([209.132.180.67]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1j8cPq-00H0dl-Gq; Mon, 02 Mar 2020 04:10:50 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727049AbgCBEMj (ORCPT + 1 other); Sun, 1 Mar 2020 23:12:39 -0500 Received: from mail-pj1-f66.google.com ([209.85.216.66]:53257 "EHLO mail-pj1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726980AbgCBEMg (ORCPT ); Sun, 1 Mar 2020 23:12:36 -0500 Received: by mail-pj1-f66.google.com with SMTP id cx7so664155pjb.3 for ; Sun, 01 Mar 2020 20:12:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=v6z/dbpsAJ3nyjiLy5ZTWHYE+yf0r+oxWKfI3Of1Dd4=; b=cMCH26pCmXb3Ya2wfhiu8tj4o9hBtdJTJvGiu/xRjRKtuOF90yWeozt5trOBt/q2Uh oJ/Yr5KSJIkgOBWJVex2mw3e9nakc8rJFN4iqFW+ZZwfgBAdxs6ubuCYhs1vG4eypZBQ UP/sm6YJo8UaB2p71u2a6c/QskLzlYYJHAH38= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=v6z/dbpsAJ3nyjiLy5ZTWHYE+yf0r+oxWKfI3Of1Dd4=; b=Af9OF62bq5EC/7p256J1liniwLBSrnFCDsXQtu35+K5cKsYTL5kzZbYj4FmxV1Vo5S nVGXo38NSGopMX4MZHzQWquBNL1GCw4lzUwJ5U8yRue3KAIRgu+rqxTYF1KNLBjRKpdy smLLP5hP6rDSLnIPWxLai14NsDnBt3JS17QOFjpmEcxs0+aX4hX79X2SbvLl8pZYsz+9 5yol4MvQlbqwkf9VXu52UJNePx0fhu6jsXThGf99lqkodJbsUifvepUI7IKgjtZhQQrP 5yhHSYTHe4TcGGGyTLFtLvD4XFvHu7QBVKjeiskzk22fpPVQpXdzR227eDUBRcMX/7Xy yiVA== X-Gm-Message-State: APjAAAV8d/bG8dsCjcQBesSDs5f+/WrATPW+0RjoK0odGzdjbEZhBJwY ttnQc6d9WHmxc/qkHyiSLuz6CQ== X-Google-Smtp-Source: APXvYqwtEuZtuxBPXd8Au6k+ScE/CbCrd3xcRWfZ+WvodYsbeu4koyiICkTyQCwIBXocLulDsiOH7w== X-Received: by 2002:a17:902:8f91:: with SMTP id z17mr16134724plo.234.1583122355107; Sun, 01 Mar 2020 20:12:35 -0800 (PST) Received: from tigerii.tok.corp.google.com ([2401:fa00:8f:203:5bbb:c872:f2b1:f53b]) by smtp.gmail.com with ESMTPSA id d82sm1698114pfd.187.2020.03.01.20.12.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Mar 2020 20:12:34 -0800 (PST) From: Sergey Senozhatsky To: Hans Verkuil , Tomasz Figa Cc: Mauro Carvalho Chehab , Kyungmin Park , Marek Szyprowski , Sakari Ailus , Laurent Pinchart , Pawel Osciak , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky Subject: [PATCHv4 02/11] videobuf2: handle V4L2 buffer cache flags Date: Mon, 2 Mar 2020 13:12:04 +0900 Message-Id: <20200302041213.27662-3-senozhatsky@chromium.org> X-Mailer: git-send-email 2.25.0.265.gbab2e86ba0-goog In-Reply-To: <20200302041213.27662-1-senozhatsky@chromium.org> References: <20200302041213.27662-1-senozhatsky@chromium.org> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Set video buffer cache management flags corresponding to V4L2 cache flags. Both ->prepare() and ->finish() cache management hints should be passed during this stage (buffer preparation), because there is no other way for user-space to tell V4L2 to avoid ->finish() cache flush. Signed-off-by: Sergey Senozhatsky --- .../media/common/videobuf2/videobuf2-v4l2.c | 49 +++++++++++++++++++ include/media/videobuf2-core.h | 11 +++++ 2 files changed, 60 insertions(+) diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index eb5d5db96552..2a604bd7793a 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -199,6 +199,15 @@ static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b vbuf->request_fd = -1; vbuf->is_held = false; + /* + * Clear buffer cache flags if queue does not support user space hints. + * That's to indicate to userspace that these flags won't work. + */ + if (!vb2_queue_allows_cache_hints(q)) { + b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE; + b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN; + } + if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { switch (b->memory) { case VB2_MEMORY_USERPTR: @@ -337,6 +346,45 @@ static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b return 0; } +static void set_buffer_cache_hints(struct vb2_queue *q, + struct vb2_buffer *vb, + struct v4l2_buffer *b) +{ + /* + * DMA exporter should take care of cache syncs, so we can avoid + * explicit ->prepare()/->finish() syncs. For other ->memory types + * we always need ->prepare() or/and ->finish() cache sync. + */ + if (q->memory == VB2_MEMORY_DMABUF) { + vb->need_cache_sync_on_finish = 0; + vb->need_cache_sync_on_prepare = 0; + return; + } + + /* + * Cache sync/invalidation flags are set by default in order to + * preserve existing behaviour for old apps/drivers. + */ + vb->need_cache_sync_on_prepare = 1; + vb->need_cache_sync_on_finish = 1; + + if (!vb2_queue_allows_cache_hints(q)) + return; + + /* + * ->finish() cache sync can be avoided when queue direction is + * TO_DEVICE. + */ + if (q->dma_dir == DMA_TO_DEVICE) + vb->need_cache_sync_on_finish = 0; + + if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE) + vb->need_cache_sync_on_finish = 0; + + if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN) + vb->need_cache_sync_on_prepare = 0; +} + static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev, struct v4l2_buffer *b, bool is_prepare, struct media_request **p_req) @@ -381,6 +429,7 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md } if (!vb->prepared) { + set_buffer_cache_hints(q, vb, b); /* Copy relevant information provided by the userspace */ memset(vbuf->planes, 0, sizeof(vbuf->planes[0]) * vb->num_planes); diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 4a19170672ac..731fd9fbd506 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -632,6 +632,17 @@ struct vb2_queue { #endif }; +/** + * vb2_queue_allows_cache_hints() - Return true if the queue allows cache + * and memory consistency hints. + * + * @q: pointer to &struct vb2_queue with videobuf2 queue + */ +static inline bool vb2_queue_allows_cache_hints(struct vb2_queue *q) +{ + return q->allow_cache_hints && q->memory == VB2_MEMORY_MMAP; +} + /** * vb2_plane_vaddr() - Return a kernel virtual address of a given plane. * @vb: pointer to &struct vb2_buffer to which the plane in