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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 BF5F5C433E6 for ; Wed, 31 Mar 2021 07:42:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98FE0619CD for ; Wed, 31 Mar 2021 07:42:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234074AbhCaHll (ORCPT ); Wed, 31 Mar 2021 03:41:41 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:64389 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234109AbhCaHlO (ORCPT ); Wed, 31 Mar 2021 03:41:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1617176474; x=1648712474; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ZZ0gmRBKCk+915yC+OTsRwaUxNIsnWdddXjW/YlqA48=; b=kNeUtWtt2aezI4f1xSsRU5cECGEjsfgcd9WjlTZd6Q7aYR3UJLgQdU+a LWewWWSJts3cVX3AyNuWM5X2vhlc0VouwOdZM17tdspe4u0HUY/UFX4j4 diVSa36VQaA9LOC921nVoGflM5DCxE7jwYIDIjvp7NJayUmKIqIUj4DZQ UpinaBwFZqFiaOuFNa2m00IwuYiwIY4rUsK+TlAm1eWSqDaqUEiS7Xk/h L8/5yZuvQYDEfKt8nrVM+YRg4l5oDx0KxLBWW3hA5HCYRw8LoXmIsnAAc 4Mw4zf600m35paez2zhF/ZRPf5tMJfpaVdyTusan/m2XV0EZfnnkzdG6A g==; IronPort-SDR: xUinNZUZ7Lb7gN1FCJJI2uBrwYpQPafpYkYPVLw4Ltmrrllw4oyn4fbOJ17djmdfVu98qsmyVt hYHR9kEah9WL5ECfK3/DVqmQ+pZhOXdtUb+uemQrGZOeW7F2X1bblcRUKnD9upO+V7qM7in1U0 GuTmpo8aY+rDiww6l/UnuJgrJe2IbnOWjtmrgbQ9BsLh4NGiQAB80IAiUOvOx1dTz3ZEOhfxnb D4caCKw+YPqR8cSfdyLURsSwKE5EuejW5Fw4Evm9QjL/BAL1Xede7y6mP81CS2BRn1U3Exohdn udw= X-IronPort-AV: E=Sophos;i="5.81,293,1610380800"; d="scan'208";a="167902128" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 31 Mar 2021 15:41:13 +0800 IronPort-SDR: qMHdxrIdx9v3/ua8qxJLxfTG6TPvh4cptu7xzMXJydOvRw2Sp7Q9cW1x6I/KzKZT2cYztQHQKL vwEAxcJPXZmyHuDOHg23N8zpZvOfx3ffFhUi+sSRQzzRZCvKsqluaMpxvD1UScHt1aocwMp606 UY/dmOVs8yvThYbBh1XHR55sLj47r5pvVYBHMhaDH0L0+MKvpvd+swK22u/D4UDMNGl9RrLB9Y qzK3fMQxaVlp65Nei/HM+wcsykb6B7cjjxMekIhOz0TGbNc1KbzmqMLP3h/RYVci3m3Z1IgdAw 6rWRI3wP5jGSVxl+a5YUAlJc Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Mar 2021 00:21:26 -0700 IronPort-SDR: zHZS082WZFoanmfroRZ/zNylL4aA4Zauz4RJ7v7d1VnqbLLZIlljwnXH/zgLOSU4zdkHvAKzhT aoHGzsN57nR/cakGM6baD7zh5ki/GZPY5h1715DSMKhXut7wKdJPi9xDH1rPoAG8Fbo8CeRVYf REGLijSRnoYkbRUNOHQD4z+4PKH58+S9TE7Ig3SmqD0y4I5uiSy5Tkku62HGNTSjJ+l3HALp6F Ottcy+3KUDCg+iM01pgJ+rGPFUNgHbt81T2+g0UMbY9jn0dShAtvVAMjonRj99qGCDSCH7N+Oo i5c= WDCIronportException: Internal Received: from bxygm33.sdcorp.global.sandisk.com ([10.0.231.247]) by uls-op-cesaip01.wdc.com with ESMTP; 31 Mar 2021 00:41:09 -0700 From: Avri Altman To: "James E . J . Bottomley" , "Martin K . Petersen" , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: gregkh@linuxfoundation.org, Bart Van Assche , yongmyung lee , Daejun Park , alim.akhtar@samsung.com, asutoshd@codeaurora.org, Zang Leigang , Avi Shchislowski , Bean Huo , cang@codeaurora.org, stanley.chu@mediatek.com, Avri Altman Subject: [PATCH v7 09/11] scsi: ufshpb: Limit the number of inflight map requests Date: Wed, 31 Mar 2021 10:39:50 +0300 Message-Id: <20210331073952.102162-10-avri.altman@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210331073952.102162-1-avri.altman@wdc.com> References: <20210331073952.102162-1-avri.altman@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In host control mode the host is the originator of map requests. To not flood the device with map requests, use a simple throttling mechanism that limits the number of inflight map requests. Signed-off-by: Avri Altman --- drivers/scsi/ufs/ufshpb.c | 11 +++++++++++ drivers/scsi/ufs/ufshpb.h | 1 + 2 files changed, 12 insertions(+) diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c index 8dbeaf948afa..c07da481ff4e 100644 --- a/drivers/scsi/ufs/ufshpb.c +++ b/drivers/scsi/ufs/ufshpb.c @@ -21,6 +21,7 @@ #define READ_TO_MS 1000 #define READ_TO_EXPIRIES 100 #define POLLING_INTERVAL_MS 200 +#define THROTTLE_MAP_REQ_DEFAULT 1 /* memory management */ static struct kmem_cache *ufshpb_mctx_cache; @@ -740,6 +741,14 @@ static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb, struct ufshpb_req *map_req; struct bio *bio; + if (hpb->is_hcm && + hpb->num_inflight_map_req >= THROTTLE_MAP_REQ_DEFAULT) { + dev_info(&hpb->sdev_ufs_lu->sdev_dev, + "map_req throttle. inflight %d throttle %d", + hpb->num_inflight_map_req, THROTTLE_MAP_REQ_DEFAULT); + return NULL; + } + map_req = ufshpb_get_req(hpb, srgn->rgn_idx, REQ_OP_SCSI_IN); if (!map_req) return NULL; @@ -754,6 +763,7 @@ static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb, map_req->rb.srgn_idx = srgn->srgn_idx; map_req->rb.mctx = srgn->mctx; + hpb->num_inflight_map_req++; return map_req; } @@ -763,6 +773,7 @@ static void ufshpb_put_map_req(struct ufshpb_lu *hpb, { bio_put(map_req->bio); ufshpb_put_req(hpb, map_req); + hpb->num_inflight_map_req--; } static int ufshpb_clear_dirty_bitmap(struct ufshpb_lu *hpb, diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h index 448062a94760..cfa0abac21db 100644 --- a/drivers/scsi/ufs/ufshpb.h +++ b/drivers/scsi/ufs/ufshpb.h @@ -217,6 +217,7 @@ struct ufshpb_lu { struct ufshpb_req *pre_req; int num_inflight_pre_req; int throttle_pre_req; + int num_inflight_map_req; struct list_head lh_pre_req_free; int cur_read_id; int pre_req_min_tr_len; -- 2.25.1