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=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,MIME_HEADER_CTYPE_ONLY, SPF_HELO_NONE,SPF_PASS,T_TVD_MIME_NO_HEADERS,USER_AGENT_GIT autolearn=ham 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 0A404C433DB for ; Wed, 17 Mar 2021 19:10:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CAF2964F53 for ; Wed, 17 Mar 2021 19:10:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233053AbhCQTJl (ORCPT ); Wed, 17 Mar 2021 15:09:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233082AbhCQTJ2 (ORCPT ); Wed, 17 Mar 2021 15:09:28 -0400 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CADDC06174A for ; Wed, 17 Mar 2021 12:09:28 -0700 (PDT) Received: by mail-pg1-x544.google.com with SMTP id 205so176873pgh.9 for ; Wed, 17 Mar 2021 12:09:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=o+bG5rBdd14xaeDgDoPWCsLWtA4YXQ0HW9pZ0TH1P8U=; b=ImXm0qx8duLdeotAVMKxJH+q9JdcvgSp6UWK3Qqpyw5edhQXS1+clfcb2rSPe/WDPA 0cKZyxH5/bsos5SKttAGpuVQhiM1QGy4cSfHL7+0b+lqIDyQKAb6qs/XjB8TBtQz6C1D 3DhmQ8TOnssneYnFy8A7pyft0rZD55fq3wZ6U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=o+bG5rBdd14xaeDgDoPWCsLWtA4YXQ0HW9pZ0TH1P8U=; b=qwA6MZgRHZX0O3neYwheKCHmLDGg9bOEsAe7+DYYZb9TIONdfOklpn0WwuBOnFuBb/ cK1st3xRA2nrGXifMb066t5ln92j7265dzm7kJaA8gwZPdsc9oaxtHB2ZUGnTeopwm6X auRpBA2+NF3y/ii44vADnuaadYLucQQEIe//44Da+ur9MllNt5oQh88b/75c4ZlproVT Sgzt0HJ05dFTxsywmjJUvb5K91qxApAsodl3aPVGVoxWcx83VxxAaxyuMF1+OFP6w6xq XqQmiQdChhekhT7h95ds6rRaepSBUVMY07OO9I6z0/5zI4xRU5rPQ94XgmcatwvDfRPB iJpA== X-Gm-Message-State: AOAM532ig7g66pNK9K0pvHtkQaUnfrYSxC2ARRjaBahGH/7/7WSRvjLF +BGi9jP5NeE5gK5qsa5FZ5/OatmYoVtqZYmZD+dFom2obmq+ZPGGmmz8ilXc4nMmI9ghc4jWF09 r1BwO5KaPYrDcW6AAhamEW68BFUoMPIP73cnz8WKJE4Hum266NnuJ/3u8ac6+q8Z0nMpzR4WxtB h/KLuGz5aLorM6 X-Google-Smtp-Source: ABdhPJx1P9uI09wtZhrqXB5FkG4+Ys2vEOp/mFaY0fmIkG5XJfcu6zGC7sCDoWHltTb76ub4rFXS8w== X-Received: by 2002:a63:471f:: with SMTP id u31mr3870022pga.252.1616008167205; Wed, 17 Mar 2021 12:09:27 -0700 (PDT) Received: from dhcp-10-123-20-75.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id w2sm20569437pgh.54.2021.03.17.12.09.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Mar 2021 12:09:26 -0700 (PDT) From: Chandrakanth Patil To: linux-scsi@vger.kernel.org Cc: kashyap.desai@broadcom.com, sumit.saxena@broadcom.com, kiran-kumar.kasturi@broadcom.com, sankar.patra@broadcom.com, sasikumar.pc@broadcom.com, shivasharan.srikanteshwara@broadcom.com, anand.lodnoor@broadcom.com, Chandrakanth Patil , Tomas Henzl Subject: [PATCH 4/5] megaraid_sas: Handle missing interrupts while re-enabling IRQs Date: Thu, 18 Mar 2021 00:38:23 +0530 Message-Id: <20210317190824.3050-5-chandrakanth.patil@broadcom.com> X-Mailer: git-send-email 2.18.1 In-Reply-To: <20210317190824.3050-1-chandrakanth.patil@broadcom.com> References: <20210317190824.3050-1-chandrakanth.patil@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000ca606605bdc03842" Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org --000000000000ca606605bdc03842 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, driver will not see the interrupts which lead to IOs timeout. This issue hits only when there is a high IOs completion on a single reply queue, which forces the driver to switch between the interrupt and IRQ context. To fix this, driver will 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/ Cc: Tomas Henzl Signed-off-by: Chandrakanth Patil Signed-off-by: Sumit Saxena --- drivers/scsi/megaraid/megaraid_sas.h | 1 + drivers/scsi/megaraid/megaraid_sas_base.c | 2 ++ drivers/scsi/megaraid/megaraid_sas_fusion.c | 22 +++++++++++++++------ 3 files changed, 19 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h index d7185aa21eb5..689bc519b4c5 100644 --- a/drivers/scsi/megaraid/megaraid_sas.h +++ b/drivers/scsi/megaraid/megaraid_sas.h @@ -2213,6 +2213,7 @@ struct megasas_irq_context { struct irq_poll irqpoll; bool irq_poll_scheduled; bool irq_line_enable; + atomic_t in_use; }; struct MR_DRV_SYSTEM_INFO { diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index f3716f7e1d10..a3584b507749 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -5630,6 +5630,7 @@ megasas_setup_irqs_ioapic(struct megasas_instance *instance) pdev = instance->pdev; instance->irq_context[0].instance = instance; instance->irq_context[0].MSIxIndex = 0; + atomic_set(&instance->irq_context[0].in_use, 0); snprintf(instance->irq_context->name, MEGASAS_MSIX_NAME_LEN, "%s%u", "megasas", instance->host->host_no); if (request_irq(pci_irq_vector(pdev, 0), @@ -5666,6 +5667,7 @@ megasas_setup_irqs_msix(struct megasas_instance *instance, u8 is_probe) for (i = 0; i < instance->msix_vectors; i++) { instance->irq_context[i].instance = instance; instance->irq_context[i].MSIxIndex = i; + atomic_set(&instance->irq_context[i].in_use, 0); snprintf(instance->irq_context[i].name, MEGASAS_MSIX_NAME_LEN, "%s%u-msix%u", "megasas", instance->host->host_no, i); if (request_irq(pci_irq_vector(pdev, i), diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index 54f8a8073ca0..d151d2e0b1c8 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -3478,7 +3478,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, struct fusion_context *fusion; struct megasas_cmd *cmd_mfi; struct megasas_cmd_fusion *cmd_fusion; - u16 smid, num_completed; + u16 smid, num_completed = 0; u8 reply_descript_type, *sense, status, extStatus; u32 device_id, data_length; union desc_value d_val; @@ -3493,6 +3493,9 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, if (atomic_read(&instance->adprecovery) == MEGASAS_HW_CRITICAL_ERROR) return IRQ_HANDLED; + if (!atomic_add_unless(&irq_context->in_use, 1, 1)) + return num_completed; + desc = fusion->reply_frames_desc[MSIxIndex] + fusion->last_reply_idx[MSIxIndex]; @@ -3503,10 +3506,10 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, reply_descript_type = reply_desc->ReplyFlags & MPI2_RPY_DESCRIPT_FLAGS_TYPE_MASK; - if (reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED) + if (reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED) { + atomic_dec(&irq_context->in_use); return IRQ_NONE; - - num_completed = 0; + } while (d_val.u.low != cpu_to_le32(UINT_MAX) && d_val.u.high != cpu_to_le32(UINT_MAX)) { @@ -3619,6 +3622,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, irq_context->irq_line_enable = true; irq_poll_sched(&irq_context->irqpoll); } + atomic_dec(&irq_context->in_use); return num_completed; } } @@ -3636,6 +3640,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, instance->reply_post_host_index_addr[0]); megasas_check_and_restore_queue_depth(instance); } + atomic_dec(&irq_context->in_use); return num_completed; } @@ -3676,6 +3681,7 @@ 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); } } } @@ -3707,6 +3713,7 @@ 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; @@ -3723,6 +3730,7 @@ megasas_complete_cmd_dpc_fusion(unsigned long instance_addr) { struct megasas_instance *instance = (struct megasas_instance *)instance_addr; + struct megasas_irq_context *irq_ctx; u32 count, MSIxIndex; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; @@ -3731,8 +3739,10 @@ 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]; + 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