From patchwork Thu Jan 28 14:58:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 373562 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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 5CEA7C433E0 for ; Thu, 28 Jan 2021 15:07:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1AED364DFB for ; Thu, 28 Jan 2021 15:07:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232135AbhA1PH3 (ORCPT ); Thu, 28 Jan 2021 10:07:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231127AbhA1PET (ORCPT ); Thu, 28 Jan 2021 10:04:19 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 73F6FC061786; Thu, 28 Jan 2021 07:03:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=eiZd5dIZYgYJoMWDSUYX8Z74U1gzd1oU/fP92j3Q9zc=; b=D3X3loMwMeMbKGv8DQXGezqm9O /z8YgqLas0IsEcomGtpbOVByKZTH50d5WGHBxxrwRw2w6bkkhgT6iGpGtPIrLK1lMyzsvzQ5uO3QW 3n2PTC79ddeVM8c3YT9hXWAA6jv2dC70JTDIdG07ilf8XPXQtbSiuSLIZ6bHf4RjVQIr5KxAeRt1F L395PraHSOjVaAMlaNkg7r0EpRu5Pttlf3FuNpcMlgMW01bAOXO4aujpI2AL4Rn3D9kpcn9SsMzpN MqqFMcDgiX2aoFXsSzxsv0y5RtlakYPBmJmQPnllCIvSHjUgkfGE1h2uaCrU5keF3BM3bUGPJ0WLm N2VkMjsQ==; Received: from [2001:4bb8:18c:25a3:5b32:95f:aa1f:ea4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l58pO-008bMG-FZ; Thu, 28 Jan 2021 15:03:26 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 6/6] media: uvcvideo: Use dma_alloc_noncontiguos API Date: Thu, 28 Jan 2021 15:58:37 +0100 Message-Id: <20210128145837.2250561-7-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Ricardo Ribalda On architectures where the is no coherent caching such as ARM use the dma_alloc_noncontiguos API and handle manually the cache flushing using dma_sync_sgtable(). With this patch on the affected architectures we can measure up to 20x performance improvement in uvc_video_copy_data_work(). Eg: aarch64 with an external usb camera NON_CONTIGUOUS frames: 999 packets: 999 empty: 0 (0 %) errors: 0 invalid: 0 pts: 0 early, 0 initial, 999 ok scr: 0 count ok, 0 diff ok sof: 2048 <= sof <= 0, freq 0.000 kHz bytes 67034480 : duration 33303 FPS: 29.99 URB: 523446/4993 uS/qty: 104.836 avg 132.532 std 13.230 min 831.094 max (uS) header: 76564/4993 uS/qty: 15.334 avg 15.229 std 3.438 min 186.875 max (uS) latency: 468945/4992 uS/qty: 93.939 avg 132.577 std 9.531 min 824.010 max (uS) decode: 54161/4993 uS/qty: 10.847 avg 6.313 std 1.614 min 111.458 max (uS) raw decode speed: 9.931 Gbits/s raw URB handling speed: 1.025 Gbits/s throughput: 16.102 Mbits/s URB decode CPU usage 0.162600 % COHERENT frames: 999 packets: 999 empty: 0 (0 %) errors: 0 invalid: 0 pts: 0 early, 0 initial, 999 ok scr: 0 count ok, 0 diff ok sof: 2048 <= sof <= 0, freq 0.000 kHz bytes 54683536 : duration 33302 FPS: 29.99 URB: 1478135/4000 uS/qty: 369.533 avg 390.357 std 22.968 min 3337.865 max (uS) header: 79761/4000 uS/qty: 19.940 avg 18.495 std 1.875 min 336.719 max (uS) latency: 281077/4000 uS/qty: 70.269 avg 83.102 std 5.104 min 735.000 max (uS) decode: 1197057/4000 uS/qty: 299.264 avg 318.080 std 1.615 min 2806.667 max (uS) raw decode speed: 365.470 Mbits/s raw URB handling speed: 295.986 Mbits/s throughput: 13.136 Mbits/s URB decode CPU usage 3.594500 % Signed-off-by: Ricardo Ribalda Signed-off-by: Christoph Hellwig --- drivers/media/usb/uvc/uvc_video.c | 76 ++++++++++++++++++++++--------- drivers/media/usb/uvc/uvcvideo.h | 4 +- 2 files changed, 57 insertions(+), 23 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index a6a441d92b9488..9c051b55dc7bc6 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -1097,6 +1098,23 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, return data[0]; } +static inline struct device *stream_to_dmadev(struct uvc_streaming *stream) +{ + return bus_to_hcd(stream->dev->udev->bus)->self.sysdev; +} + +static void uvc_urb_dma_sync(struct uvc_urb *uvc_urb, bool for_device) +{ + struct device *dma_dev = dma_dev = stream_to_dmadev(uvc_urb->stream); + + if (for_device) + dma_sync_sgtable_for_device(dma_dev, uvc_urb->sgt, + DMA_FROM_DEVICE); + else + dma_sync_sgtable_for_cpu(dma_dev, uvc_urb->sgt, + DMA_FROM_DEVICE); +} + /* * uvc_video_decode_data_work: Asynchronous memcpy processing * @@ -1118,6 +1136,8 @@ static void uvc_video_copy_data_work(struct work_struct *work) uvc_queue_buffer_release(op->buf); } + uvc_urb_dma_sync(uvc_urb, true); + ret = usb_submit_urb(uvc_urb->urb, GFP_KERNEL); if (ret < 0) uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", @@ -1539,10 +1559,12 @@ static void uvc_video_complete(struct urb *urb) * Process the URB headers, and optionally queue expensive memcpy tasks * to be deferred to a work queue. */ + uvc_urb_dma_sync(uvc_urb, false); stream->decode(uvc_urb, buf, buf_meta); /* If no async work is needed, resubmit the URB immediately. */ if (!uvc_urb->async_operations) { + uvc_urb_dma_sync(uvc_urb, true); ret = usb_submit_urb(uvc_urb->urb, GFP_ATOMIC); if (ret < 0) uvc_printk(KERN_ERR, @@ -1559,24 +1581,47 @@ static void uvc_video_complete(struct urb *urb) */ static void uvc_free_urb_buffers(struct uvc_streaming *stream) { + struct device *dma_dev = dma_dev = stream_to_dmadev(stream); struct uvc_urb *uvc_urb; for_each_uvc_urb(uvc_urb, stream) { if (!uvc_urb->buffer) continue; -#ifndef CONFIG_DMA_NONCOHERENT - usb_free_coherent(stream->dev->udev, stream->urb_size, - uvc_urb->buffer, uvc_urb->dma); -#else - kfree(uvc_urb->buffer); -#endif + dma_vunmap_noncontiguous(dma_dev, uvc_urb->buffer); + dma_free_noncontiguous(dma_dev, stream->urb_size, uvc_urb->sgt, + uvc_urb->dma, DMA_BIDIRECTIONAL); + uvc_urb->buffer = NULL; } stream->urb_size = 0; } +static bool uvc_alloc_urb_buffer(struct uvc_streaming *stream, + struct uvc_urb *uvc_urb, gfp_t gfp_flags) +{ + struct device *dma_dev = stream_to_dmadev(stream); + + + uvc_urb->sgt = dma_alloc_noncontiguous(dma_dev, stream->urb_size, + &uvc_urb->dma, DMA_BIDIRECTIONAL, + gfp_flags); + if (!uvc_urb->sgt) + return false; + + uvc_urb->buffer = dma_vmap_noncontiguous(dma_dev, stream->urb_size, + uvc_urb->sgt); + if (!uvc_urb->buffer) { + dma_free_noncontiguous(dma_dev, stream->urb_size, + uvc_urb->sgt, uvc_urb->dma, + DMA_BIDIRECTIONAL); + return false; + } + + return true; +} + /* * Allocate transfer buffers. This function can be called with buffers * already allocated when resuming from suspend, in which case it will @@ -1607,19 +1652,11 @@ static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, /* Retry allocations until one succeed. */ for (; npackets > 1; npackets /= 2) { + stream->urb_size = psize * npackets; for (i = 0; i < UVC_URBS; ++i) { struct uvc_urb *uvc_urb = &stream->uvc_urb[i]; - stream->urb_size = psize * npackets; -#ifndef CONFIG_DMA_NONCOHERENT - uvc_urb->buffer = usb_alloc_coherent( - stream->dev->udev, stream->urb_size, - gfp_flags | __GFP_NOWARN, &uvc_urb->dma); -#else - uvc_urb->buffer = - kmalloc(stream->urb_size, gfp_flags | __GFP_NOWARN); -#endif - if (!uvc_urb->buffer) { + if (!uvc_alloc_urb_buffer(stream, uvc_urb, gfp_flags)) { uvc_free_urb_buffers(stream); break; } @@ -1728,12 +1765,8 @@ static int uvc_init_video_isoc(struct uvc_streaming *stream, urb->context = uvc_urb; urb->pipe = usb_rcvisocpipe(stream->dev->udev, ep->desc.bEndpointAddress); -#ifndef CONFIG_DMA_NONCOHERENT urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; urb->transfer_dma = uvc_urb->dma; -#else - urb->transfer_flags = URB_ISO_ASAP; -#endif urb->interval = ep->desc.bInterval; urb->transfer_buffer = uvc_urb->buffer; urb->complete = uvc_video_complete; @@ -1793,10 +1826,8 @@ static int uvc_init_video_bulk(struct uvc_streaming *stream, usb_fill_bulk_urb(urb, stream->dev->udev, pipe, uvc_urb->buffer, size, uvc_video_complete, uvc_urb); -#ifndef CONFIG_DMA_NONCOHERENT urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; urb->transfer_dma = uvc_urb->dma; -#endif uvc_urb->urb = urb; } @@ -1891,6 +1922,7 @@ static int uvc_video_start_transfer(struct uvc_streaming *stream, /* Submit the URBs. */ for_each_uvc_urb(uvc_urb, stream) { + uvc_urb_dma_sync(uvc_urb, true); ret = usb_submit_urb(uvc_urb->urb, gfp_flags); if (ret < 0) { uvc_printk(KERN_ERR, "Failed to submit URB %u (%d).\n", diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index a3dfacf069c44d..a386114bd22999 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -521,7 +521,8 @@ struct uvc_copy_op { * @urb: the URB described by this context structure * @stream: UVC streaming context * @buffer: memory storage for the URB - * @dma: DMA coherent addressing for the urb_buffer + * @dma: Allocated DMA handle + * @sgt: sgt_table with the urb locations in memory * @async_operations: counter to indicate the number of copy operations * @copy_operations: work descriptors for asynchronous copy operations * @work: work queue entry for asynchronous decode @@ -532,6 +533,7 @@ struct uvc_urb { char *buffer; dma_addr_t dma; + struct sg_table *sgt; unsigned int async_operations; struct uvc_copy_op copy_operations[UVC_MAX_PACKETS];