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Wed, 17 Mar 2021 20:14:58 +0100 Received: from vleu-orange.cadence.com (10.160.88.83) by maileu3.global.cadence.com (10.160.88.99) with Microsoft SMTP Server (TLS) id 15.0.1497.2 via Frontend Transport; Wed, 17 Mar 2021 20:14:58 +0100 Received: from vleu-orange.cadence.com (localhost.localdomain [127.0.0.1]) by vleu-orange.cadence.com (8.14.4/8.14.4) with ESMTP id 12HJExJ9015846; Wed, 17 Mar 2021 20:14:59 +0100 Received: (from sparmar@localhost) by vleu-orange.cadence.com (8.14.4/8.14.4/Submit) id 12HJEwsf015840; Wed, 17 Mar 2021 20:14:58 +0100 From: Sanket Parmar To: CC: , , , , , , , , Sanket Parmar Subject: [PATCH v2] usb: cdns3: Optimize DMA request buffer allocation Date: Wed, 17 Mar 2021 20:13:59 +0100 Message-ID: <1616008439-15494-1-git-send-email-sparmar@cadence.com> X-Mailer: git-send-email 2.4.5 MIME-Version: 1.0 Content-Type: text/plain X-OrganizationHeadersPreserved: maileu3.global.cadence.com X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6931c712-c2e3-41e1-7440-08d8e978f7f2 X-MS-TrafficTypeDiagnostic: SJ0PR07MB8583: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:346; 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X-OriginatorOrg: cadence.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Mar 2021 19:15:03.7074 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6931c712-c2e3-41e1-7440-08d8e978f7f2 X-MS-Exchange-CrossTenant-Id: d36035c5-6ce6-4662-a3dc-e762e61ae4c9 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=d36035c5-6ce6-4662-a3dc-e762e61ae4c9;Ip=[158.140.1.148];Helo=[sjmaillnx2.cadence.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM12FT003.eop-nam12.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR07MB8583 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-17_11:2021-03-17,2021-03-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_check_notspam policy=outbound_check score=0 adultscore=0 priorityscore=1501 bulkscore=0 phishscore=0 clxscore=1015 lowpriorityscore=0 malwarescore=0 spamscore=0 suspectscore=0 impostorscore=0 mlxscore=0 mlxlogscore=745 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103170132 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org dma_alloc_coherent() might fail on the platform with a small DMA region. To avoid such failure in cdns3_prepare_aligned_request_buf(), dma_alloc_coherent() is replaced with dma_alloc_noncoherent() to allocate aligned request buffer of dynamic length. Reported-by: Aswath Govindraju Signed-off-by: Sanket Parmar --- Changelog: v2: - used dma_*_noncoherent() APIs - changed the commit log drivers/usb/cdns3/cdns3-gadget.c | 30 ++++++++++++++++++++++++------ drivers/usb/cdns3/cdns3-gadget.h | 2 ++ 2 files changed, 26 insertions(+), 6 deletions(-) diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index 0b892a2..126087b 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -819,9 +819,15 @@ void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep, priv_ep->dir); if ((priv_req->flags & REQUEST_UNALIGNED) && - priv_ep->dir == USB_DIR_OUT && !request->status) + priv_ep->dir == USB_DIR_OUT && !request->status) { + /* Make DMA buffer CPU accessible */ + dma_sync_single_for_cpu(priv_dev->sysdev, + priv_req->aligned_buf->dma, + priv_req->aligned_buf->size, + priv_req->aligned_buf->dir); memcpy(request->buf, priv_req->aligned_buf->buf, request->length); + } priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED); /* All TRBs have finished, clear the counter */ @@ -883,8 +889,8 @@ static void cdns3_free_aligned_request_buf(struct work_struct *work) * interrupts. */ spin_unlock_irqrestore(&priv_dev->lock, flags); - dma_free_coherent(priv_dev->sysdev, buf->size, - buf->buf, buf->dma); + dma_free_noncoherent(priv_dev->sysdev, buf->size, + buf->buf, buf->dma, buf->dir); kfree(buf); spin_lock_irqsave(&priv_dev->lock, flags); } @@ -911,10 +917,13 @@ static int cdns3_prepare_aligned_request_buf(struct cdns3_request *priv_req) return -ENOMEM; buf->size = priv_req->request.length; + buf->dir = usb_endpoint_dir_in(priv_ep->endpoint.desc) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE; - buf->buf = dma_alloc_coherent(priv_dev->sysdev, + buf->buf = dma_alloc_noncoherent(priv_dev->sysdev, buf->size, &buf->dma, + buf->dir, GFP_ATOMIC); if (!buf->buf) { kfree(buf); @@ -936,10 +945,18 @@ static int cdns3_prepare_aligned_request_buf(struct cdns3_request *priv_req) } if (priv_ep->dir == USB_DIR_IN) { + /* Make DMA buffer CPU accessible */ + dma_sync_single_for_cpu(priv_dev->sysdev, + buf->dma, buf->size, buf->dir); memcpy(buf->buf, priv_req->request.buf, priv_req->request.length); } + /* Transfer DMA buffer ownership back to device */ + dma_sync_single_for_device(priv_dev->sysdev, + buf->dma, buf->size, buf->dir); + + priv_req->flags |= REQUEST_UNALIGNED; trace_cdns3_prepare_aligned_request(priv_req); @@ -3088,9 +3105,10 @@ static void cdns3_gadget_exit(struct cdns *cdns) struct cdns3_aligned_buf *buf; buf = cdns3_next_align_buf(&priv_dev->aligned_buf_list); - dma_free_coherent(priv_dev->sysdev, buf->size, + dma_free_noncoherent(priv_dev->sysdev, buf->size, buf->buf, - buf->dma); + buf->dma, + buf->dir); list_del(&buf->list); kfree(buf); diff --git a/drivers/usb/cdns3/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h index ecf9b91..c5660f2 100644 --- a/drivers/usb/cdns3/cdns3-gadget.h +++ b/drivers/usb/cdns3/cdns3-gadget.h @@ -12,6 +12,7 @@ #ifndef __LINUX_CDNS3_GADGET #define __LINUX_CDNS3_GADGET #include +#include /* * USBSS-DEV register interface. @@ -1205,6 +1206,7 @@ struct cdns3_aligned_buf { void *buf; dma_addr_t dma; u32 size; + enum dma_data_direction dir; unsigned in_use:1; struct list_head list; }; -- 2.4.5