From patchwork Wed Apr 3 10:09:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Ferre X-Patchwork-Id: 10883201 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 03175922 for ; Wed, 3 Apr 2019 10:10:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DCF88289A5 for ; Wed, 3 Apr 2019 10:10:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D167A289AF; Wed, 3 Apr 2019 10:10:22 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 8CE27289A5 for ; Wed, 3 Apr 2019 10:10:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To :From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=h/7IuWXCiZ3nAAD8wEXxqcCiF3Lne/tmyyFDfxefQ/s=; b=LbsCfO4QasL3dV 1e/wQO2swt49vxYw8Bqlldx5ShkuYHUnhNIujoc2Q2EKQREOr7RJueFv/DBHyF56gbK39Sj9ZzgyV +WeOUgnHVbpxgkCe/Xe4fewJXcDZ4X9YarrSt5f8XSm1JjTx+27OU9j+dCZUQMdDtveWBXCmB7q0j 4MpcMV06usFLvHfZ8PaL36vG6pYTn7t6pHp4xWFmEP/6LrNUb9eHvu+45BaQ1ez9JgsZbo5cVWnDR sZKrnYSDqMitjOKB/gXEC0MU8oOzoH06WhZUV8eAL4wKp9jk6IiEx6x62a/aY5oZKZ8lzB9BwcyWf 07+HFqGb+B0m2m0VpI0g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBcqU-0003Hv-Pp; Wed, 03 Apr 2019 10:10:14 +0000 Received: from esa6.microchip.iphmx.com ([216.71.154.253]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBcqR-0003Gz-VF for linux-arm-kernel@lists.infradead.org; Wed, 03 Apr 2019 10:10:13 +0000 X-IronPort-AV: E=Sophos;i="5.60,304,1549954800"; d="scan'208";a="26664723" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa6.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 03 Apr 2019 03:10:09 -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 03:10:09 -0700 From: Nicolas Ferre To: , Vinod Koul Subject: [PATCH v2 1/3] dmaengine: at_xdmac: remove BUG_ON macro in tasklet Date: Wed, 3 Apr 2019 12:09:51 +0200 Message-ID: <20190403100953.26199-1-nicolas.ferre@microchip.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190403_031012_041913_E94EAC7D X-CRM114-Status: UNSURE ( 9.93 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ludovic Desroches , Alexandre Belloni , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Even if this case shouldn't happen when controller is properly programmed, it's still better to avoid dumping a kernel Oops for this. As the sequence may happen only for debugging purposes, log the error and just finish the tasklet call. Signed-off-by: Nicolas Ferre Acked-by: Ludovic Desroches --- v2: added Ludovic's tag drivers/dma/at_xdmac.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index fe69dccfa0c0..37a269420435 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -1606,7 +1606,11 @@ static void at_xdmac_tasklet(unsigned long data) struct at_xdmac_desc, xfer_node); dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); - BUG_ON(!desc->active_xfer); + if (!desc->active_xfer) { + dev_err(chan2dev(&atchan->chan), "Xfer not active: exiting"); + spin_unlock_bh(&atchan->lock); + return; + } txd = &desc->tx_dma_desc; 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: 10883207 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 CF753184E for ; Wed, 3 Apr 2019 10:10:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B5227285D9 for ; Wed, 3 Apr 2019 10:10:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A9EA9289A5; Wed, 3 Apr 2019 10:10:27 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5A655289AA for ; Wed, 3 Apr 2019 10:10:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=tgGcfj44vZ3Z/iecA0IiScdv8p+iHUzczhS151JgUHI=; b=jOcCjVmZ63vAxu 7W/abggaF6JoQxAt920yLkwcTEuwxwM3ZORRAn8SFR+9ERAkpQrLRCsRxdQJAmGI9tNowm8p/BcU8 ogZXGyhWNFMFSifFSuQrMjFS8TOHAif/yKwFBjwOL5YZXDvnRjseudfyLpaj4fyztZSeUOLe/3gEW v36k6pHOtbsNZaNLNm/W59yb35yLhh2vusQc7PkzpkRWzphyHMpJWR9oEdVFSJOFUVGzGoYudRGig 5ceNjUzre00wuDZAAG95LHSQJnhXrmSRbJio5iGtI6JSH5+bw3XW6phmhSh9GNtggo+DiwcF8PTqq 4p+TA+y/B8//sbJ/6fsg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBcqb-0003Qy-7c; Wed, 03 Apr 2019 10:10:21 +0000 Received: from esa1.microchip.iphmx.com ([68.232.147.91]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBcqS-0003H0-Cv for linux-arm-kernel@lists.infradead.org; Wed, 03 Apr 2019 10:10:13 +0000 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190403_031012_545349_A5436D26 X-CRM114-Status: GOOD ( 11.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ludovic Desroches , Alexandre Belloni , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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, From patchwork Wed Apr 3 10:09:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Ferre X-Patchwork-Id: 10883209 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 0A2CE1575 for ; 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bh=KZVt10lTRireGf6At2hyc3s9e0M1q1wgmZLWCtUmhxw=; b=u9jx0pM1OMbLPQ sraCGF6k2zGSaYVXZ1JRBQZ88MAw8fxN1F+rdkcuwX7hGGiKyAG8H3pw4hw5tyhHBFyCi8QIWQvSi 9PBGASk39lKaaS36ZMokc/Hk7UCypNciABxVUniL0H4hI0moFbdtvusJqjkeFK/eEDI27pYQvLyb2 BP+Vg1XHBDZRR/FznjkOl9VoOknFvY/YDmremhbZEJ4buO9qvHMu+ufOjCf4/Z8ACeOqz92i50E2a e0+IkUxudlk+pQL1+EsNzlHCeuh9nLB/vZv1J+llh3d8UEaohJAIRfERy9IvXn9HIcg8YYl1XwIQh uI/Y6SrG2sORCM/53kAw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBcqn-0003hE-Hj; Wed, 03 Apr 2019 10:10:33 +0000 Received: from esa6.microchip.iphmx.com ([216.71.154.253]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hBcqT-0003Gz-J0 for linux-arm-kernel@lists.infradead.org; Wed, 03 Apr 2019 10:10:14 +0000 X-IronPort-AV: E=Sophos;i="5.60,304,1549954800"; d="scan'208";a="26664727" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa6.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 03 Apr 2019 03:10:13 -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 03:10:12 -0700 From: Nicolas Ferre To: , Vinod Koul Subject: [PATCH v2 3/3] dmaengine: at_xdmac: only monitor overflow errors for peripheral xfer Date: Wed, 3 Apr 2019 12:09:53 +0200 Message-ID: <20190403100953.26199-3-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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190403_031013_660020_6A6A0A3C X-CRM114-Status: GOOD ( 11.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ludovic Desroches , Alexandre Belloni , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The overflow error flag (ROI: Request Overflow Error) is only relevant for the case when the channel handles a peripheral synchronized transfer. Not in the case of memory to memory transfer where there is no hardware request signal. Remove the use of this interrupt source in such a case. It's based on the first descriptor which holds the configuration for the whole linked list transfer. Signed-off-by: Nicolas Ferre Acked-by: Ludovic Desroches --- v2: added Ludovic's tag drivers/dma/at_xdmac.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index b7117474a10d..cbe545ae4dfc 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -308,6 +308,11 @@ static inline int at_xdmac_csize(u32 maxburst) return csize; }; +static inline bool at_xdmac_chan_is_peripheral_xfer(u32 cfg) +{ + return cfg & AT_XDMAC_CC_TYPE_PER_TRAN; +} + static inline u8 at_xdmac_get_dwidth(u32 cfg) { return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET; @@ -389,7 +394,13 @@ static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff); - reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE | AT_XDMAC_CIE_ROIE; + reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE; + /* + * Request Overflow Error is only for peripheral synchronized transfers + */ + if (at_xdmac_chan_is_peripheral_xfer(first->lld.mbr_cfg)) + reg |= AT_XDMAC_CIE_ROIE; + /* * There is no end of list when doing cyclic dma, we need to get * an interrupt after each periods.