From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6D17C11F6F for ; Sat, 10 Jul 2021 02:32:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B14606124C for ; Sat, 10 Jul 2021 02:32:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234279AbhGJCfl (ORCPT ); Fri, 9 Jul 2021 22:35:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:48416 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234434AbhGJCb3 (ORCPT ); Fri, 9 Jul 2021 22:31:29 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B233861422; Sat, 10 Jul 2021 02:27:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625884057; bh=wIFOHxxG1WGVVfYfKR8/d5d2XYXxPUVK5xaAmAYljR8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NWAOZmA6LF6lW+LSxFjSsYR3Fp2xxGoUwntohE85qQLJY9QSOMw9qFX9R3Ib4W1PF KXFu6Q62TUgh1mrZ0lhN1aHf9rcgap/grBqAAuizaaD3jvto7Cz/iJR588XbYtFGSy KuQj1ZMlUEkxEQ0vO8geBNyYry8yE2PXsDabk0YVZyaxnsqAXn3gKCRkpDes4bd4Wp 6HaGO7VyS5O7OTNU47SykG7BoeEsc8nbpeOxVsnONWNdaojGoPRpYtNJAzas1GJxOG LJVMvm6fNvTIpwmo70jNxCEy4JHr3bs4ZXWTNOhDKEEXxQTjvE/djuGiCXalxELgCI oA6Tmp+UPyp0Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Chandrakanth Patil , Tomas Henzl , kernel test robot , Sumit Saxena , "Martin K . Petersen" , Sasha Levin , megaraidlinux.pdl@broadcom.com, linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 22/63] scsi: megaraid_sas: Handle missing interrupts while re-enabling IRQs Date: Fri, 9 Jul 2021 22:26:28 -0400 Message-Id: <20210710022709.3170675-22-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210710022709.3170675-1-sashal@kernel.org> References: <20210710022709.3170675-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chandrakanth Patil [ Upstream commit 9bedd36e9146b34dda4d6994e3aa1d72bc6442c1 ] While reenabling the IRQ after IRQ poll there may be a small window for the firmware to post the replies with interrupts raised. In that case the driver will not see the interrupts which leads to I/O timeout. This issue only happens when there are many I/O completions on a single reply queue. This forces the driver to switch between the interrupt and IRQ context. Make the driver process the reply queue one more time after enabling the IRQ. Link: https://lore.kernel.org/linux-scsi/20201102072746.27410-1-sreekanth.reddy@broadcom.com/ Link: https://lore.kernel.org/r/20210528131307.25683-5-chandrakanth.patil@broadcom.com Cc: Tomas Henzl Reported-by: kernel test robot Signed-off-by: Chandrakanth Patil Signed-off-by: Sumit Saxena Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/megaraid/megaraid_sas_fusion.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index ae7a3e154bb2..a78a702511fa 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -3716,6 +3716,7 @@ static void megasas_sync_irqs(unsigned long instance_addr) if (irq_ctx->irq_poll_scheduled) { irq_ctx->irq_poll_scheduled = false; enable_irq(irq_ctx->os_irq); + complete_cmd_fusion(instance, irq_ctx->MSIxIndex, irq_ctx); } } } @@ -3747,6 +3748,7 @@ int megasas_irqpoll(struct irq_poll *irqpoll, int budget) irq_poll_complete(irqpoll); irq_ctx->irq_poll_scheduled = false; enable_irq(irq_ctx->os_irq); + complete_cmd_fusion(instance, irq_ctx->MSIxIndex, irq_ctx); } return num_entries; @@ -3763,6 +3765,7 @@ megasas_complete_cmd_dpc_fusion(unsigned long instance_addr) { struct megasas_instance *instance = (struct megasas_instance *)instance_addr; + struct megasas_irq_context *irq_ctx = NULL; u32 count, MSIxIndex; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; @@ -3771,8 +3774,10 @@ megasas_complete_cmd_dpc_fusion(unsigned long instance_addr) if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) return; - for (MSIxIndex = 0 ; MSIxIndex < count; MSIxIndex++) - complete_cmd_fusion(instance, MSIxIndex, NULL); + for (MSIxIndex = 0 ; MSIxIndex < count; MSIxIndex++) { + irq_ctx = &instance->irq_context[MSIxIndex]; + complete_cmd_fusion(instance, MSIxIndex, irq_ctx); + } } /** -- 2.30.2