From patchwork Tue Apr 27 13:13:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergey Senozhatsky X-Patchwork-Id: 12226725 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B18C5C433ED for ; Tue, 27 Apr 2021 13:14:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C32E613DD for ; Tue, 27 Apr 2021 13:14:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237891AbhD0NPD (ORCPT ); Tue, 27 Apr 2021 09:15:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237864AbhD0NPB (ORCPT ); Tue, 27 Apr 2021 09:15:01 -0400 Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53F64C06138E for ; Tue, 27 Apr 2021 06:14:17 -0700 (PDT) Received: by mail-pj1-x1029.google.com with SMTP id h14-20020a17090aea8eb02901553e1cc649so4958293pjz.0 for ; Tue, 27 Apr 2021 06:14:17 -0700 (PDT) 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=m2inrvWtZ8EV40v82r8RpmM6Sv4+6d9vUVvq2SBpYGY=; b=OL6pfDZ8LQLKoVXyjMPrk/VAc1MgDy/QtTaBQwneoLY2ZXrH4ytwSQOqv4UptaHuE+ gLFkBLXmLVoSEuvmcrMoniQpemKmLdkGCVbnTc5fzx30K3BVwON5Rf3wTnJXmYCNnOd0 Qm3Di31tY9DReeQvbvk8peyIdcMI5G73qclHE= 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=m2inrvWtZ8EV40v82r8RpmM6Sv4+6d9vUVvq2SBpYGY=; b=ntkTUsBk3x7rsLug7YtI2TuOQfjp/DytLta8GRGPwTQJ9X/ny/9Tycr/YJmoGuo8sd 0OQEqRJXxLGaVr7NWquMgmreDxY2XAeKBgpxa/eAZ9anMoPJuW+L03FmOG/kmkXUNA+6 leEVheDWyKjUe3glMiBGgyCxUj7MNgRBcJGgtJCRJDwPc9iBDmZ4zzAMo/gyWV98bOQu rDNEjb4r0X3+mKronnsWVWkhUzx5HqZrZwyTNtutK/uszLYxHd2Q4/KKD6orR1sURPr7 i2TuqO9Denltdb7WYAtUjMrsctcDQ4gTFguj9VCae2CBp/wyE3uT9Y/rKlMtfulbt382 J2GA== X-Gm-Message-State: AOAM531L2qDxnMg8Zq9sA99BLpN6FQMuzw3nBMkSwSuy8/57p2+CqMzL JW+oGCdtwS/ii6Wreez7t1i+EA== X-Google-Smtp-Source: ABdhPJxiEn7C8gafZbJ4dgU0fR5UKjwQ/3e4ZVjXFyKUzLiGFXBWwX1u/8Z2fbtrgsy4fBDvVvD77w== X-Received: by 2002:a17:902:b582:b029:ed:562a:6f52 with SMTP id a2-20020a170902b582b02900ed562a6f52mr4386093pls.73.1619529256794; Tue, 27 Apr 2021 06:14:16 -0700 (PDT) Received: from senozhatsky.flets-east.jp ([2409:10:2e40:5100:8192:3566:9cd4:8ed7]) by smtp.gmail.com with ESMTPSA id c8sm2755313pfp.160.2021.04.27.06.14.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Apr 2021 06:14:16 -0700 (PDT) From: Sergey Senozhatsky To: Tomasz Figa , Hans Verkuil Cc: Ricardo Ribalda , Christoph Hellwig , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Sergey Senozhatsky Subject: [PATCHv2 7/8] videobuf2: handle V4L2_MEMORY_FLAG_NON_COHERENT flag Date: Tue, 27 Apr 2021 22:13:42 +0900 Message-Id: <20210427131344.139443-8-senozhatsky@chromium.org> X-Mailer: git-send-email 2.31.1.498.g6c1eba8ee3d-goog In-Reply-To: <20210427131344.139443-1-senozhatsky@chromium.org> References: <20210427131344.139443-1-senozhatsky@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch lets user-space to request a non-coherent memory allocation during CREATE_BUFS and REQBUFS ioctl calls. = CREATE_BUFS struct v4l2_create_buffers has seven 4-byte reserved areas, so reserved[0] is renamed to ->flags. The struct, thus, now has six reserved 4-byte regions. = CREATE_BUFS32 struct v4l2_create_buffers32 has seven 4-byte reserved areas, so reserved[0] is renamed to ->flags. The struct, thus, now has six reserved 4-byte regions. = REQBUFS We use one byte of a 4 byte ->reserved[1] member of struct v4l2_requestbuffers. The struct, thus, now has reserved 3 bytes. Signed-off-by: Sergey Senozhatsky --- .../media/v4l/vidioc-create-bufs.rst | 7 ++++- .../media/v4l/vidioc-reqbufs.rst | 12 +++++--- .../media/common/videobuf2/videobuf2-core.c | 4 +-- .../media/common/videobuf2/videobuf2-v4l2.c | 28 +++++++++++++++++-- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 9 +++++- drivers/media/v4l2-core/v4l2-ioctl.c | 5 +--- include/uapi/linux/videodev2.h | 9 ++++-- 7 files changed, 57 insertions(+), 17 deletions(-) diff --git a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst index f98f18c9e91c..a048a9f6b7b6 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst @@ -113,7 +113,12 @@ than the number requested. ``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type. * - __u32 - - ``reserved``\ [7] + - ``flags`` + - Specifies additional buffer management attributes. + See :ref:`memory-flags`. + + * - __u32 + - ``reserved``\ [6] - A place holder for future extensions. Drivers and applications must set the array to zero. diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst index e59306aba2b0..5a047c0ec3e8 100644 --- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst +++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst @@ -104,10 +104,14 @@ aborting or finishing any DMA in progress, an implicit ``V4L2_MEMORY_MMAP`` and ``type`` set to the buffer type. This will free any previously allocated buffers, so this is typically something that will be done at the start of the application. - * - __u32 - - ``reserved``\ [1] - - A place holder for future extensions. Drivers and applications - must set the array to zero. + * - __u8 + - ``flags`` + - Specifies additional buffer management attributes. + See :ref:`memory-flags`. + * - __u8 + - ``reserved``\ [3] + - Reserved for future extensions. + - .. _v4l2-buf-capabilities: .. _V4L2-BUF-CAP-SUPPORTS-MMAP: diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index af4db310cf5e..38505783247e 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -762,7 +762,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory, { unsigned int num_buffers, allocated_buffers, num_planes = 0; unsigned plane_sizes[VB2_MAX_PLANES] = { }; - bool coherent_mem = true; + bool coherent_mem = !(flags & V4L2_MEMORY_FLAG_NON_COHERENT); unsigned int i; int ret; @@ -906,7 +906,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory, { unsigned int num_planes = 0, num_buffers, allocated_buffers; unsigned plane_sizes[VB2_MAX_PLANES] = { }; - bool coherent_mem = true; + bool coherent_mem = !(flags & V4L2_MEMORY_FLAG_NON_COHERENT); int ret; if (q->num_buffers == VB2_MAX_FRAME) { diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 1166d5a9291a..8d344335552e 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -692,12 +692,29 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps) #endif } +static void validate_memory_flags(struct vb2_queue *q, + int memory, + u32 *flags) +{ + if (!q->allow_cache_hints || memory != V4L2_MEMORY_MMAP) { + /* + * This needs to clear V4L2_MEMORY_FLAG_NON_COHERENT only, + * but in order to avoid bugs we zero out all bits. + */ + *flags = 0; + } +} + int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) { int ret = vb2_verify_memory_type(q, req->memory, req->type); + u32 flags = req->flags; fill_buf_caps(q, &req->capabilities); - return ret ? ret : vb2_core_reqbufs(q, req->memory, 0, &req->count); + validate_memory_flags(q, req->memory, &flags); + req->flags = flags; + return ret ? ret : vb2_core_reqbufs(q, req->memory, + req->flags, &req->count); } EXPORT_SYMBOL_GPL(vb2_reqbufs); @@ -729,6 +746,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) unsigned i; fill_buf_caps(q, &create->capabilities); + validate_memory_flags(q, create->memory, &create->flags); create->index = q->num_buffers; if (create->count == 0) return ret != -EBUSY ? ret : 0; @@ -772,7 +790,7 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create) if (requested_sizes[i] == 0) return -EINVAL; return ret ? ret : vb2_core_create_bufs(q, create->memory, - 0, + create->flags, &create->count, requested_planes, requested_sizes); @@ -955,13 +973,16 @@ int vb2_ioctl_reqbufs(struct file *file, void *priv, { struct video_device *vdev = video_devdata(file); int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type); + u32 flags = p->flags; fill_buf_caps(vdev->queue, &p->capabilities); + validate_memory_flags(vdev->queue, p->memory, &flags); + p->flags = flags; if (res) return res; if (vb2_queue_is_busy(vdev, file)) return -EBUSY; - res = vb2_core_reqbufs(vdev->queue, p->memory, 0, &p->count); + res = vb2_core_reqbufs(vdev->queue, p->memory, p->flags, &p->count); /* If count == 0, then the owner has released all buffers and he is no longer owner of the queue. Otherwise we have a new owner. */ if (res == 0) @@ -979,6 +1000,7 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv, p->index = vdev->queue->num_buffers; fill_buf_caps(vdev->queue, &p->capabilities); + validate_memory_flags(vdev->queue, p->memory, &p->flags); /* * If count == 0, then just check if memory and type are valid. * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0. diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index 0ca75f6784c5..1aa9ca3b6ca4 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -126,6 +126,9 @@ struct v4l2_format32 { * @memory: buffer memory type * @format: frame format, for which buffers are requested * @capabilities: capabilities of this buffer type. + * @flags: additional buffer management attributes (ignored unless the + * queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability and + * configured for MMAP streaming I/O). * @reserved: future extensions */ struct v4l2_create_buffers32 { @@ -134,7 +137,8 @@ struct v4l2_create_buffers32 { __u32 memory; /* enum v4l2_memory */ struct v4l2_format32 format; __u32 capabilities; - __u32 reserved[7]; + __u32 flags; + __u32 reserved[6]; }; static int get_v4l2_format32(struct v4l2_format *p64, @@ -182,6 +186,8 @@ static int get_v4l2_create32(struct v4l2_create_buffers *p64, if (copy_from_user(p64, p32, offsetof(struct v4l2_create_buffers32, format))) return -EFAULT; + if (copy_from_user(&p64->flags, &p32->flags, sizeof(p32->flags))) + return -EFAULT; return get_v4l2_format32(&p64->format, &p32->format); } @@ -227,6 +233,7 @@ static int put_v4l2_create32(struct v4l2_create_buffers *p64, if (copy_to_user(p32, p64, offsetof(struct v4l2_create_buffers32, format)) || put_user(p64->capabilities, &p32->capabilities) || + put_user(p64->flags, &p32->flags) || copy_to_user(p32->reserved, p64->reserved, sizeof(p64->reserved))) return -EFAULT; return put_v4l2_format32(&p64->format, &p32->format); diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c index 2673f51aafa4..b1430a741936 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -2003,9 +2003,6 @@ static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops, if (ret) return ret; - - CLEAR_AFTER_FIELD(p, capabilities); - return ops->vidioc_reqbufs(file, fh, p); } @@ -2045,7 +2042,7 @@ static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops, if (ret) return ret; - CLEAR_AFTER_FIELD(create, capabilities); + CLEAR_AFTER_FIELD(create, flags); v4l_sanitize_format(&create->format); diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index 15f9c9df35d5..d62a6e4f83a0 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -953,7 +953,8 @@ struct v4l2_requestbuffers { __u32 type; /* enum v4l2_buf_type */ __u32 memory; /* enum v4l2_memory */ __u32 capabilities; - __u32 reserved[1]; + __u8 flags; + __u8 reserved[3]; }; #define V4L2_MEMORY_FLAG_NON_COHERENT (1 << 0) @@ -2494,6 +2495,9 @@ struct v4l2_dbg_chip_info { * @memory: enum v4l2_memory; buffer memory type * @format: frame format, for which buffers are requested * @capabilities: capabilities of this buffer type. + * @flags: additional buffer management attributes (ignored unless the + * queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability + * and configured for MMAP streaming I/O). * @reserved: future extensions */ struct v4l2_create_buffers { @@ -2502,7 +2506,8 @@ struct v4l2_create_buffers { __u32 memory; struct v4l2_format format; __u32 capabilities; - __u32 reserved[7]; + __u32 flags; + __u32 reserved[6]; }; /*