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Thu, 4 Feb 2021 07:59:50 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7ZVhGws29JSN for ; Thu, 4 Feb 2021 07:59:47 +0000 (UTC) X-Greylist: delayed 00:20:01 by SQLgrey-1.7.6 Received: from mail3-163.sinamail.sina.com.cn (mail3-163.sinamail.sina.com.cn [202.108.3.163]) by whitealder.osuosl.org (Postfix) with SMTP id 21FA5856F4 for ; Thu, 4 Feb 2021 07:59:46 +0000 (UTC) Received: from unknown (HELO localhost.localdomain)([103.193.190.174]) by sina.com (172.16.97.27) with ESMTP id 601BA4BD0000D4A5; Thu, 4 Feb 2021 15:39:42 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com X-SMAIL-MID: 52072649283320 From: Hillf Danton To: Christoph Hellwig Subject: Re: [PATCH 7/7] media: uvcvideo: Use dma_alloc_noncontiguos API Date: Thu, 4 Feb 2021 15:39:32 +0800 Message-Id: <20210204073932.2441-1-hdanton@sina.com> In-Reply-To: <20210202095110.1215346-8-hch@lst.de> References: <20210202095110.1215346-1-hch@lst.de> MIME-Version: 1.0 Cc: Sven Van Asbroeck , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, Ricardo Ribalda , Sergey Senozhatsky , Robin Murphy X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Tue, 2 Feb 2021 10:51:10 +0100 > 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 | 79 ++++++++++++++++++++++--------- > drivers/media/usb/uvc/uvcvideo.h | 4 +- > 2 files changed, 60 insertions(+), 23 deletions(-) > > diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c > index a6a441d92b9488..0a7d287dc41528 100644 > --- a/drivers/media/usb/uvc/uvc_video.c > +++ b/drivers/media/usb/uvc/uvc_video.c > @@ -6,11 +6,13 @@ > * Laurent Pinchart (laurent.pinchart@ideasonboard.com) > */ > > +#include > #include > #include > #include > #include > #include > +#include > #include > #include > #include > @@ -1097,6 +1099,26 @@ 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); > + invalidate_kernel_vmap_range(uvc_urb->buffer, > + uvc_urb->stream->urb_size); > + } > +} > + > /* > * uvc_video_decode_data_work: Asynchronous memcpy processing > * > @@ -1118,6 +1140,8 @@ 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 +1563,12 @@ 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 +1585,46 @@ 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, > + DMA_FROM_DEVICE); > + > 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, > + DMA_FROM_DEVICE, gfp_flags); > + if (!uvc_urb->sgt) > + return false; > + uvc_urb->dma = uvc_urb->sgt->sgl->dma_address; > + > + 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, DMA_FROM_DEVICE); > + 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 +1655,11 @@ 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 +1768,8 @@ 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 +1829,8 @@ 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 +1925,7 @@ 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]; > -- > 2.29.2 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu