From patchwork Wed Apr 3 10:09:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Ferre X-Patchwork-Id: 10883205 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9FA4B184E for ; Wed, 3 Apr 2019 10:10:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 893B1289A5 for ; Wed, 3 Apr 2019 10:10:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7D8F9289AF; Wed, 3 Apr 2019 10:10:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1D016289A5 for ; Wed, 3 Apr 2019 10:10:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726615AbfDCKKO (ORCPT ); Wed, 3 Apr 2019 06:10:14 -0400 Received: from esa1.microchip.iphmx.com ([68.232.147.91]:49692 "EHLO esa1.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725935AbfDCKKM (ORCPT ); Wed, 3 Apr 2019 06:10:12 -0400 X-IronPort-AV: E=Sophos;i="5.60,304,1549954800"; d="scan'208";a="30724118" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa1.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 03 Apr 2019 03:10:11 -0700 Received: from tenerife.corp.atmel.com (10.10.76.4) by chn-sv-exch03.mchp-main.com (10.10.76.49) with Microsoft SMTP Server id 14.3.352.0; Wed, 3 Apr 2019 03:10:10 -0700 From: Nicolas Ferre To: , Vinod Koul CC: Ludovic Desroches , , Alexandre Belloni , , "Nicolas Ferre" Subject: [PATCH v2 2/3] dmaengine: at_xdmac: enhance channel errors handling in tasklet Date: Wed, 3 Apr 2019 12:09:52 +0200 Message-ID: <20190403100953.26199-2-nicolas.ferre@microchip.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190403100953.26199-1-nicolas.ferre@microchip.com> References: <20190403100953.26199-1-nicolas.ferre@microchip.com> MIME-Version: 1.0 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Complement the identification of errors with stoping the channel and dumping the descriptor that led to the error case. Signed-off-by: Nicolas Ferre Acked-by: Ludovic Desroches --- v2: added Ludovic's tag address Vinod's comments (typo, comment, empty line before logical blocks) drivers/dma/at_xdmac.c | 48 ++++++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 6 deletions(-) diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index 37a269420435..b7117474a10d 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -1575,6 +1575,46 @@ static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan) dmaengine_desc_get_callback_invoke(txd, NULL); } +static void at_xdmac_handle_error(struct at_xdmac_chan *atchan) +{ + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + struct at_xdmac_desc *bad_desc; + + /* + * The descriptor currently at the head of the active list is + * broken. Since we don't have any way to report errors, we'll + * just have to scream loudly and try to continue with other + * descriptors queued (if any). + */ + if (atchan->irq_status & AT_XDMAC_CIS_RBEIS) + dev_err(chan2dev(&atchan->chan), "read bus error!!!"); + if (atchan->irq_status & AT_XDMAC_CIS_WBEIS) + dev_err(chan2dev(&atchan->chan), "write bus error!!!"); + if (atchan->irq_status & AT_XDMAC_CIS_ROIS) + dev_err(chan2dev(&atchan->chan), "request overflow error!!!"); + + spin_lock_bh(&atchan->lock); + + /* Channel must be disabled first as it's not done automatically */ + at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); + while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask) + cpu_relax(); + + bad_desc = list_first_entry(&atchan->xfers_list, + struct at_xdmac_desc, + xfer_node); + + spin_unlock_bh(&atchan->lock); + + /* Print bad descriptor's details if needed */ + dev_dbg(chan2dev(&atchan->chan), + "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n", + __func__, &bad_desc->lld.mbr_sa, &bad_desc->lld.mbr_da, + bad_desc->lld.mbr_ubc); + + /* Then continue with usual descriptor management */ +} + static void at_xdmac_tasklet(unsigned long data) { struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data; @@ -1594,12 +1634,8 @@ static void at_xdmac_tasklet(unsigned long data) || (atchan->irq_status & error_mask)) { struct dma_async_tx_descriptor *txd; - if (atchan->irq_status & AT_XDMAC_CIS_RBEIS) - dev_err(chan2dev(&atchan->chan), "read bus error!!!"); - if (atchan->irq_status & AT_XDMAC_CIS_WBEIS) - dev_err(chan2dev(&atchan->chan), "write bus error!!!"); - if (atchan->irq_status & AT_XDMAC_CIS_ROIS) - dev_err(chan2dev(&atchan->chan), "request overflow error!!!"); + if (atchan->irq_status & error_mask) + at_xdmac_handle_error(atchan); spin_lock(&atchan->lock); desc = list_first_entry(&atchan->xfers_list,