From patchwork Fri Sep 1 12:44:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Gaignard X-Patchwork-Id: 13372561 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B4FACA0FE8 for ; Fri, 1 Sep 2023 12:44:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349636AbjIAMo4 (ORCPT ); Fri, 1 Sep 2023 08:44:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44772 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349540AbjIAMoi (ORCPT ); Fri, 1 Sep 2023 08:44:38 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E392C10E0; Fri, 1 Sep 2023 05:44:31 -0700 (PDT) Received: from benjamin-XPS-13-9310.. (unknown [IPv6:2a01:e0a:120:3210:4d01:31d2:de6b:d217]) (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: benjamin.gaignard) by madras.collabora.co.uk (Postfix) with ESMTPSA id 3013A66072DD; Fri, 1 Sep 2023 13:44:30 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1693572270; bh=RxD3xSDCEdnT60RpFN3/lMF+aQdnWdvqYjXyF4zF7GA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AS0oFTKXVrac7+GGJkXk7dnC6EtnouoFdCCDstp2NZDMkAUueLcHLXUsy5PUrWnWt AEKpoVgGZN0uPw23VJ8tA1zSjr/B4P+KyFLhjSDFz8+dIYWB0R6UMWZPG3KaEsHVwH eJTZCOoLonDUVz6iPo2/4AS7+OWMmVdhkE8UEtKz4orbB+f2hXQamvNBtjAMFeF6Ut 74PEAnJ2SXGVXkMyTdNO+VBJPr1MA+Oj3yQOZNFUodCWW/zstl2MH69rcYWoVnRaRI cpVYvnuCMfP+RYlv1ADfQg1xReE8JMfGwp5guAVXoleWDYNgqkU3QfMZRrbQu2c0is 9PETN2bfEXUpw== From: Benjamin Gaignard To: mchehab@kernel.org, tfiga@chromium.org, m.szyprowski@samsung.com, ming.qian@nxp.com, ezequiel@vanguardiasur.com.ar, p.zabel@pengutronix.de, gregkh@linuxfoundation.org, hverkuil-cisco@xs4all.nl, nicolas.dufresne@collabora.com Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev, kernel@collabora.com, Benjamin Gaignard Subject: [PATCH v6 10/18] media: videobuf2: Access vb2_queue bufs array through helper functions Date: Fri, 1 Sep 2023 14:44:06 +0200 Message-Id: <20230901124414.48497-11-benjamin.gaignard@collabora.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230901124414.48497-1-benjamin.gaignard@collabora.com> References: <20230901124414.48497-1-benjamin.gaignard@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org This patch adds 2 helpers functions to add and remove vb2 buffers from a queue. With these 2 and vb2_get_buffer(), bufs field of struct vb2_queue becomes like a private member of the structure. After each call to vb2_get_buffer() we need to be sure that we get a valid pointer so check the return value of all of them. Signed-off-by: Benjamin Gaignard --- .../media/common/videobuf2/videobuf2-core.c | 177 ++++++++++++++---- .../media/common/videobuf2/videobuf2-v4l2.c | 37 ++-- 2 files changed, 162 insertions(+), 52 deletions(-) diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 6c77187c174c..15b583ce0c69 100644 --- a/drivers/media/common/videobuf2/videobuf2-core.c +++ b/drivers/media/common/videobuf2/videobuf2-core.c @@ -403,6 +403,37 @@ static void init_buffer_cache_hints(struct vb2_queue *q, struct vb2_buffer *vb) vb->skip_cache_sync_on_finish = 1; } +/** + * vb2_queue_add_buffer() - add a buffer to a queue + * @q: pointer to &struct vb2_queue with videobuf2 queue. + * @vb: pointer to &struct vb2_buffer to be added to the queue. + * @index: index where add vb2_buffer in the queue + */ +static bool vb2_queue_add_buffer(struct vb2_queue *q, struct vb2_buffer *vb, unsigned int index) +{ + if (index < VB2_MAX_FRAME && !q->bufs[index]) { + q->bufs[index] = vb; + vb->index = index; + vb->vb2_queue = q; + return true; + } + + return false; +} + +/** + * vb2_queue_remove_buffer() - remove a buffer from a queue + * @q: pointer to &struct vb2_queue with videobuf2 queue. + * @vb: pointer to &struct vb2_buffer to be removed from the queue. + */ +static void vb2_queue_remove_buffer(struct vb2_queue *q, struct vb2_buffer *vb) +{ + if (vb->index < VB2_MAX_FRAME) { + q->bufs[vb->index] = NULL; + vb->vb2_queue = NULL; + } +} + /* * __vb2_queue_alloc() - allocate vb2 buffer structures and (for MMAP type) * video buffer memory for all buffers/planes on the queue and initializes the @@ -431,9 +462,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory, } vb->state = VB2_BUF_STATE_DEQUEUED; - vb->vb2_queue = q; vb->num_planes = num_planes; - vb->index = q->num_buffers + buffer; vb->type = q->type; vb->memory = memory; init_buffer_cache_hints(q, vb); @@ -443,7 +472,11 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory, } call_void_bufop(q, init_buffer, vb); - q->bufs[vb->index] = vb; + if (!vb2_queue_add_buffer(q, vb, q->num_buffers + buffer)) { + dprintk(q, 1, "failed adding buffer %d to queue\n", buffer); + kfree(vb); + break; + } /* Allocate video buffer memory for the MMAP type */ if (memory == VB2_MEMORY_MMAP) { @@ -451,7 +484,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory, if (ret) { dprintk(q, 1, "failed allocating memory for buffer %d\n", buffer); - q->bufs[vb->index] = NULL; + vb2_queue_remove_buffer(q, vb); kfree(vb); break; } @@ -466,7 +499,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory, dprintk(q, 1, "buffer %d %p initialization failed\n", buffer, vb); __vb2_buf_mem_free(vb); - q->bufs[vb->index] = NULL; + vb2_queue_remove_buffer(q, vb); kfree(vb); break; } @@ -489,7 +522,7 @@ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers) for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; ++buffer) { - vb = q->bufs[buffer]; + vb = vb2_get_buffer(q, buffer); if (!vb) continue; @@ -517,7 +550,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) /* Call driver-provided cleanup function for each buffer, if provided */ for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; ++buffer) { - struct vb2_buffer *vb = q->bufs[buffer]; + struct vb2_buffer *vb = vb2_get_buffer(q, buffer); if (vb && vb->planes[0].mem_priv) call_void_vb_qop(vb, buf_cleanup, vb); @@ -559,15 +592,20 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) q->cnt_unprepare_streaming = 0; } for (buffer = 0; buffer < q->num_buffers; ++buffer) { - struct vb2_buffer *vb = q->bufs[buffer]; - bool unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || - vb->cnt_mem_prepare != vb->cnt_mem_finish || - vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || - vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || - vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || - vb->cnt_buf_queue != vb->cnt_buf_done || - vb->cnt_buf_prepare != vb->cnt_buf_finish || - vb->cnt_buf_init != vb->cnt_buf_cleanup; + struct vb2_buffer *vb = vb2_get_buffer(q, buffer); + bool unbalanced; + + if (!vb) + continue; + + unbalanced = vb->cnt_mem_alloc != vb->cnt_mem_put || + vb->cnt_mem_prepare != vb->cnt_mem_finish || + vb->cnt_mem_get_userptr != vb->cnt_mem_put_userptr || + vb->cnt_mem_attach_dmabuf != vb->cnt_mem_detach_dmabuf || + vb->cnt_mem_map_dmabuf != vb->cnt_mem_unmap_dmabuf || + vb->cnt_buf_queue != vb->cnt_buf_done || + vb->cnt_buf_prepare != vb->cnt_buf_finish || + vb->cnt_buf_init != vb->cnt_buf_cleanup; if (unbalanced) { pr_info("unbalanced counters for queue %p, buffer %d\n", @@ -610,8 +648,13 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers) /* Free vb2 buffers */ for (buffer = q->num_buffers - buffers; buffer < q->num_buffers; ++buffer) { - kfree(q->bufs[buffer]); - q->bufs[buffer] = NULL; + struct vb2_buffer *vb = vb2_get_buffer(q, buffer); + + if (!vb) + continue; + + vb2_queue_remove_buffer(q, vb); + kfree(vb); } q->num_buffers -= buffers; @@ -647,7 +690,12 @@ static bool __buffers_in_use(struct vb2_queue *q) { unsigned int buffer; for (buffer = 0; buffer < q->num_buffers; ++buffer) { - if (vb2_buffer_in_use(q, q->bufs[buffer])) + struct vb2_buffer *vb = vb2_get_buffer(q, buffer); + + if (!vb) + continue; + + if (vb2_buffer_in_use(q, vb)) return true; } return false; @@ -1632,7 +1680,11 @@ static int vb2_start_streaming(struct vb2_queue *q) * correctly return them to vb2. */ for (i = 0; i < q->num_buffers; ++i) { - vb = q->bufs[i]; + vb = vb2_get_buffer(q, i); + + if (!vb) + continue; + if (vb->state == VB2_BUF_STATE_ACTIVE) vb2_buffer_done(vb, VB2_BUF_STATE_QUEUED); } @@ -2033,12 +2085,18 @@ static void __vb2_queue_cancel(struct vb2_queue *q) * to vb2 in stop_streaming(). */ if (WARN_ON(atomic_read(&q->owned_by_drv_count))) { - for (i = 0; i < q->num_buffers; ++i) - if (q->bufs[i]->state == VB2_BUF_STATE_ACTIVE) { + for (i = 0; i < q->num_buffers; ++i) { + struct vb2_buffer *vb = vb2_get_buffer(q, i); + + if (!vb) + continue; + + if (vb->state == VB2_BUF_STATE_ACTIVE) { pr_warn("driver bug: stop_streaming operation is leaving buf %p in active state\n", - q->bufs[i]); - vb2_buffer_done(q->bufs[i], VB2_BUF_STATE_ERROR); + vb); + vb2_buffer_done(vb, VB2_BUF_STATE_ERROR); } + } /* Must be zero now */ WARN_ON(atomic_read(&q->owned_by_drv_count)); } @@ -2072,9 +2130,14 @@ static void __vb2_queue_cancel(struct vb2_queue *q) * be changed, so we can't move the buf_finish() to __vb2_dqbuf(). */ for (i = 0; i < q->num_buffers; ++i) { - struct vb2_buffer *vb = q->bufs[i]; - struct media_request *req = vb->req_obj.req; + struct vb2_buffer *vb; + struct media_request *req; + + vb = vb2_get_buffer(q, i); + if (!vb) + continue; + req = vb->req_obj.req; /* * If a request is associated with this buffer, then * call buf_request_cancel() to give the driver to complete() @@ -2224,7 +2287,10 @@ static int __find_plane_by_offset(struct vb2_queue *q, unsigned long off, buffer = (off >> PLANE_INDEX_SHIFT) & BUFFER_INDEX_MASK; plane = (off >> PAGE_SHIFT) & PLANE_INDEX_MASK; - vb = q->bufs[buffer]; + vb = vb2_get_buffer(q, buffer); + if (!vb) + return -EINVAL; + if (vb->planes[plane].m.offset == off) { *_buffer = buffer; *_plane = plane; @@ -2336,7 +2402,13 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma) if (ret) goto unlock; - vb = q->bufs[buffer]; + vb = vb2_get_buffer(q, buffer); + + if (!vb) { + dprintk(q, 1, "can't find the requested buffer\n"); + ret = -EINVAL; + goto unlock; + } /* * MMAP requires page_aligned buffers. @@ -2393,7 +2465,12 @@ unsigned long vb2_get_unmapped_area(struct vb2_queue *q, if (ret) goto unlock; - vb = q->bufs[buffer]; + vb = vb2_get_buffer(q, buffer); + if (!vb) { + dprintk(q, 1, "can't find the requested buffer\n"); + ret = -EINVAL; + goto unlock; + } vaddr = vb2_plane_vaddr(vb, plane); mutex_unlock(&q->mmap_lock); @@ -2622,6 +2699,7 @@ struct vb2_fileio_data { static int __vb2_init_fileio(struct vb2_queue *q, int read) { struct vb2_fileio_data *fileio; + struct vb2_buffer *vb; int i, ret; unsigned int count = 0; @@ -2672,11 +2750,18 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) if (ret) goto err_kfree; + /* + * Userspace can never add or delete buffers later, so there + * will never be holes. It is safe to assume that vb2_get_buffer(q, 0) + * will always return a valid vb pointer + */ + vb = vb2_get_buffer(q, 0); + /* * Check if plane_count is correct * (multiplane buffers are not supported). */ - if (q->bufs[0]->num_planes != 1) { + if (vb->num_planes != 1) { ret = -EBUSY; goto err_reqbufs; } @@ -2685,12 +2770,17 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read) * Get kernel address of each buffer. */ for (i = 0; i < q->num_buffers; i++) { - fileio->bufs[i].vaddr = vb2_plane_vaddr(q->bufs[i], 0); + vb = vb2_get_buffer(q, i); + + if (!vb) + continue; + + fileio->bufs[i].vaddr = vb2_plane_vaddr(vb, 0); if (fileio->bufs[i].vaddr == NULL) { ret = -EINVAL; goto err_reqbufs; } - fileio->bufs[i].size = vb2_plane_size(q->bufs[i], 0); + fileio->bufs[i].size = vb2_plane_size(vb, 0); } /* @@ -2818,15 +2908,18 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_ fileio->cur_index = index; buf = &fileio->bufs[index]; - b = q->bufs[index]; + b = vb2_get_buffer(q, index); + + if (!b) + return -EINVAL; /* * Get number of bytes filled by the driver */ buf->pos = 0; buf->queued = 0; - buf->size = read ? vb2_get_plane_payload(q->bufs[index], 0) - : vb2_plane_size(q->bufs[index], 0); + buf->size = read ? vb2_get_plane_payload(b, 0) + : vb2_plane_size(b, 0); /* Compensate for data_offset on read in the multiplanar case. */ if (is_multiplanar && read && b->planes[0].data_offset < buf->size) { @@ -2869,8 +2962,12 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_ * Queue next buffer if required. */ if (buf->pos == buf->size || (!read && fileio->write_immediately)) { - struct vb2_buffer *b = q->bufs[index]; + struct vb2_buffer *b = vb2_get_buffer(q, index); + if (!b) { + dprintk(q, 1, "can't find the requested buffer\n"); + return -EINVAL; + } /* * Check if this is the last buffer to read. */ @@ -2896,7 +2993,7 @@ static size_t __vb2_perform_fileio(struct vb2_queue *q, char __user *data, size_ */ buf->pos = 0; buf->queued = 1; - buf->size = vb2_plane_size(q->bufs[index], 0); + buf->size = vb2_plane_size(b, 0); fileio->q_count += 1; /* * If we are queuing up buffers for the first time, then @@ -2967,7 +3064,9 @@ static int vb2_thread(void *data) * Call vb2_dqbuf to get buffer back. */ if (prequeue) { - vb = q->bufs[index++]; + vb = vb2_get_buffer(q, index++); + if (!vb) + continue; prequeue--; } else { call_void_qop(q, wait_finish, q); @@ -2976,7 +3075,7 @@ static int vb2_thread(void *data) call_void_qop(q, wait_prepare, q); dprintk(q, 5, "file io: vb2_dqbuf result: %d\n", ret); if (!ret) - vb = q->bufs[index]; + vb = vb2_get_buffer(q, index); } if (ret || threadio->stop) break; diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c index 697c8a9f98cd..8ba658ad9891 100644 --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c @@ -383,8 +383,8 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md return -EINVAL; } - if (q->bufs[b->index] == NULL) { - /* Should never happen */ + vb = vb2_get_buffer(q, b->index); + if (!vb) { dprintk(q, 1, "%s: buffer is NULL\n", opname); return -EINVAL; } @@ -394,7 +394,6 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md return -EINVAL; } - vb = q->bufs[b->index]; vbuf = to_vb2_v4l2_buffer(vb); ret = __verify_planes_array(vb, b); if (ret) @@ -628,11 +627,22 @@ static const struct vb2_buf_ops v4l2_buf_ops = { struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp) { unsigned int i; + struct vb2_buffer *vb2; + + /* + * This loop doesn't scale if there is a really large number of buffers. + * Maybe something more efficient will be needed in this case. + */ + for (i = 0; i < q->num_buffers; i++) { + vb2 = vb2_get_buffer(q, i); - for (i = 0; i < q->num_buffers; i++) - if (q->bufs[i]->copied_timestamp && - q->bufs[i]->timestamp == timestamp) - return vb2_get_buffer(q, i); + if (!vb2) + continue; + + if (vb2->copied_timestamp && + vb2->timestamp == timestamp) + return vb2; + } return NULL; } EXPORT_SYMBOL_GPL(vb2_find_buffer); @@ -660,11 +670,12 @@ int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) return -EINVAL; } - if (b->index >= q->num_buffers) { - dprintk(q, 1, "buffer index out of range\n"); + vb = vb2_get_buffer(q, b->index); + if (!vb) { + dprintk(q, 1, "can't find the requested buffer\n"); return -EINVAL; } - vb = q->bufs[b->index]; + ret = __verify_planes_array(vb, b); if (!ret) vb2_core_querybuf(q, vb, b); @@ -734,11 +745,11 @@ int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev, if (b->flags & V4L2_BUF_FLAG_REQUEST_FD) return -EINVAL; - if (b->index >= q->num_buffers) { - dprintk(q, 1, "buffer index out of range\n"); + vb = vb2_get_buffer(q, b->index); + if (!vb) { + dprintk(q, 1, "can't find the requested buffer\n"); return -EINVAL; } - vb = q->bufs[b->index]; ret = vb2_queue_or_prepare_buf(q, mdev, b, true, NULL);