From: Antti Palosaari <crope@iki.fi>
To: Mauro Carvalho Chehab <mchehab@s-opensource.com>,
Linux Media Mailing List <linux-media@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Subject: Re: [PATCH] media: dvb-usb-v2: stop using coherent memory for URBs
Date: Tue, 13 Mar 2018 21:22:55 +0200 [thread overview]
Message-ID: <28084fba-62ba-6f1a-28fb-1aabbb92d4e5@iki.fi> (raw)
In-Reply-To: <6a131c6ca8afe5d000b9cbfadff96ea72f200852.1520536139.git.mchehab@s-opensource.com>
On 03/08/2018 09:09 PM, Mauro Carvalho Chehab wrote:
> There's no need to use coherent buffers there. So, let the
> DVB core do the allocation. That should give some performance
> gain outside x86.
Hello! I am not familiar with that change, but I think you know what you
do. Feel free to apply!
regards
Antti
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
> ---
> drivers/media/usb/dvb-usb-v2/usb_urb.c | 17 ++++-------------
> 1 file changed, 4 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/media/usb/dvb-usb-v2/usb_urb.c b/drivers/media/usb/dvb-usb-v2/usb_urb.c
> index dce2b97efce4..b0499f95ec45 100644
> --- a/drivers/media/usb/dvb-usb-v2/usb_urb.c
> +++ b/drivers/media/usb/dvb-usb-v2/usb_urb.c
> @@ -155,8 +155,7 @@ static int usb_urb_alloc_bulk_urbs(struct usb_data_stream *stream)
> stream->props.u.bulk.buffersize,
> usb_urb_complete, stream);
>
> - stream->urb_list[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
> - stream->urb_list[i]->transfer_dma = stream->dma_addr[i];
> + stream->urb_list[i]->transfer_flags = URB_FREE_BUFFER;
> stream->urbs_initialized++;
> }
> return 0;
> @@ -187,13 +186,12 @@ static int usb_urb_alloc_isoc_urbs(struct usb_data_stream *stream)
> urb->complete = usb_urb_complete;
> urb->pipe = usb_rcvisocpipe(stream->udev,
> stream->props.endpoint);
> - urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
> + urb->transfer_flags = URB_ISO_ASAP | URB_FREE_BUFFER;
> urb->interval = stream->props.u.isoc.interval;
> urb->number_of_packets = stream->props.u.isoc.framesperurb;
> urb->transfer_buffer_length = stream->props.u.isoc.framesize *
> stream->props.u.isoc.framesperurb;
> urb->transfer_buffer = stream->buf_list[i];
> - urb->transfer_dma = stream->dma_addr[i];
>
> for (j = 0; j < stream->props.u.isoc.framesperurb; j++) {
> urb->iso_frame_desc[j].offset = frame_offset;
> @@ -212,11 +210,7 @@ static int usb_free_stream_buffers(struct usb_data_stream *stream)
> if (stream->state & USB_STATE_URB_BUF) {
> while (stream->buf_num) {
> stream->buf_num--;
> - dev_dbg(&stream->udev->dev, "%s: free buf=%d\n",
> - __func__, stream->buf_num);
> - usb_free_coherent(stream->udev, stream->buf_size,
> - stream->buf_list[stream->buf_num],
> - stream->dma_addr[stream->buf_num]);
> + stream->buf_list[stream->buf_num] = NULL;
> }
> }
>
> @@ -236,9 +230,7 @@ static int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,
> __func__, num * size);
>
> for (stream->buf_num = 0; stream->buf_num < num; stream->buf_num++) {
> - stream->buf_list[stream->buf_num] = usb_alloc_coherent(
> - stream->udev, size, GFP_ATOMIC,
> - &stream->dma_addr[stream->buf_num]);
> + stream->buf_list[stream->buf_num] = kzalloc(size, GFP_ATOMIC);
> if (!stream->buf_list[stream->buf_num]) {
> dev_dbg(&stream->udev->dev, "%s: alloc buf=%d failed\n",
> __func__, stream->buf_num);
> @@ -250,7 +242,6 @@ static int usb_alloc_stream_buffers(struct usb_data_stream *stream, int num,
> __func__, stream->buf_num,
> stream->buf_list[stream->buf_num],
> (long long)stream->dma_addr[stream->buf_num]);
> - memset(stream->buf_list[stream->buf_num], 0, size);
> stream->state |= USB_STATE_URB_BUF;
> }
>
>
--
http://palosaari.fi/
prev parent reply other threads:[~2018-03-13 19:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-08 19:09 [PATCH] media: dvb-usb-v2: stop using coherent memory for URBs Mauro Carvalho Chehab
2018-03-13 19:22 ` Antti Palosaari [this message]
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