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Tue, 9 Mar 2021 06:19:59 +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; Tue, 9 Mar 2021 06:19:59 +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 1295JxET009441; Tue, 9 Mar 2021 06:19:59 +0100 Received: (from sparmar@localhost) by vleu-orange.cadence.com (8.14.4/8.14.4/Submit) id 1295JwO0009434; Tue, 9 Mar 2021 06:19:58 +0100 From: Sanket Parmar To: CC: , , , , , , , Sanket Parmar Subject: [PATCH 1/2] usb: cdns3: Use dma_pool_* api to alloc trb pool Date: Tue, 9 Mar 2021 06:19:39 +0100 Message-ID: <1615267180-9289-1-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: 6d55e154-4901-41dc-362d-08d8e2bafe2f X-MS-TrafficTypeDiagnostic: BN8PR07MB8002: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:1360; 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X-OriginatorOrg: cadence.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Mar 2021 05:20:02.8267 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6d55e154-4901-41dc-362d-08d8e2bafe2f X-MS-Exchange-CrossTenant-Id: d36035c5-6ce6-4662-a3dc-e762e61ae4c9 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=d36035c5-6ce6-4662-a3dc-e762e61ae4c9;Ip=[199.43.4.23];Helo=[rmmaillnx1.cadence.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM12FT039.eop-nam12.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR07MB8002 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-09_03:2021-03-08,2021-03-09 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_check_notspam policy=outbound_check score=0 suspectscore=0 phishscore=0 clxscore=1015 bulkscore=0 impostorscore=0 priorityscore=1501 spamscore=0 malwarescore=0 lowpriorityscore=0 mlxlogscore=955 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103090025 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allocation of DMA coherent memory in atomic context using dma_alloc_coherent() might fail on platforms with smaller DMA region. To fix it, dma_alloc_coherent() is replaced with dma_pool API to allocate a smaller chunk of DMA coherent memory for TRB rings. Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver") Reported-by: Aswath Govindraju Signed-off-by: Sanket Parmar --- drivers/usb/cdns3/cdns3-gadget.c | 42 +++++++++++++++++-------------------- drivers/usb/cdns3/cdns3-gadget.h | 1 + 2 files changed, 20 insertions(+), 23 deletions(-) diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c index 582bfec..5f51215 100644 --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -59,6 +59,7 @@ #include #include #include +#include #include #include "core.h" @@ -190,29 +191,13 @@ dma_addr_t cdns3_trb_virt_to_dma(struct cdns3_endpoint *priv_ep, return priv_ep->trb_pool_dma + offset; } -static int cdns3_ring_size(struct cdns3_endpoint *priv_ep) -{ - switch (priv_ep->type) { - case USB_ENDPOINT_XFER_ISOC: - return TRB_ISO_RING_SIZE; - case USB_ENDPOINT_XFER_CONTROL: - return TRB_CTRL_RING_SIZE; - default: - if (priv_ep->use_streams) - return TRB_STREAM_RING_SIZE; - else - return TRB_RING_SIZE; - } -} - static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep) { struct cdns3_device *priv_dev = priv_ep->cdns3_dev; if (priv_ep->trb_pool) { - dma_free_coherent(priv_dev->sysdev, - cdns3_ring_size(priv_ep), - priv_ep->trb_pool, priv_ep->trb_pool_dma); + dma_pool_free(priv_dev->eps_dma_pool, + priv_ep->trb_pool, priv_ep->trb_pool_dma); priv_ep->trb_pool = NULL; } } @@ -226,7 +211,7 @@ static void cdns3_free_trb_pool(struct cdns3_endpoint *priv_ep) int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep) { struct cdns3_device *priv_dev = priv_ep->cdns3_dev; - int ring_size = cdns3_ring_size(priv_ep); + int ring_size = TRB_RING_SIZE; int num_trbs = ring_size / TRB_SIZE; struct cdns3_trb *link_trb; @@ -234,10 +219,10 @@ int cdns3_allocate_trb_pool(struct cdns3_endpoint *priv_ep) cdns3_free_trb_pool(priv_ep); if (!priv_ep->trb_pool) { - priv_ep->trb_pool = dma_alloc_coherent(priv_dev->sysdev, - ring_size, - &priv_ep->trb_pool_dma, - GFP_DMA32 | GFP_ATOMIC); + priv_ep->trb_pool = dma_pool_alloc(priv_dev->eps_dma_pool, + GFP_DMA32 | GFP_ATOMIC, + &priv_ep->trb_pool_dma); + if (!priv_ep->trb_pool) return -ENOMEM; @@ -3113,6 +3098,7 @@ static void cdns3_gadget_exit(struct cdns *cdns) dma_free_coherent(priv_dev->sysdev, 8, priv_dev->setup_buf, priv_dev->setup_dma); + dma_pool_destroy(priv_dev->eps_dma_pool); kfree(priv_dev->zlp_buf); usb_put_gadget(&priv_dev->gadget); @@ -3185,6 +3171,14 @@ static int cdns3_gadget_start(struct cdns *cdns) /* initialize endpoint container */ INIT_LIST_HEAD(&priv_dev->gadget.ep_list); INIT_LIST_HEAD(&priv_dev->aligned_buf_list); + priv_dev->eps_dma_pool = dma_pool_create("cdns3_eps_dma_pool", + priv_dev->sysdev, + TRB_RING_SIZE, 8, 0); + if (!priv_dev->eps_dma_pool) { + dev_err(priv_dev->dev, "Failed to create TRB dma pool\n"); + ret = -ENOMEM; + goto err1; + } ret = cdns3_init_eps(priv_dev); if (ret) { @@ -3235,6 +3229,8 @@ static int cdns3_gadget_start(struct cdns *cdns) err2: cdns3_free_all_eps(priv_dev); err1: + dma_pool_destroy(priv_dev->eps_dma_pool); + usb_put_gadget(&priv_dev->gadget); cdns->gadget_dev = NULL; return ret; diff --git a/drivers/usb/cdns3/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h index 21fa461..ecf9b91 100644 --- a/drivers/usb/cdns3/cdns3-gadget.h +++ b/drivers/usb/cdns3/cdns3-gadget.h @@ -1298,6 +1298,7 @@ struct cdns3_device { struct cdns3_usb_regs __iomem *regs; + struct dma_pool *eps_dma_pool; struct usb_ctrlrequest *setup_buf; dma_addr_t setup_dma; void *zlp_buf; -- 1.7.1