From patchwork Wed Nov 13 13:36:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 11241907 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 11AF01390 for ; Wed, 13 Nov 2019 13:40:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E602122467 for ; Wed, 13 Nov 2019 13:40:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727361AbfKMNk3 (ORCPT ); Wed, 13 Nov 2019 08:40:29 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:40766 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727129AbfKMNk3 (ORCPT ); Wed, 13 Nov 2019 08:40:29 -0500 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 226C13C6C4E38D3107F6; Wed, 13 Nov 2019 21:40:24 +0800 (CST) Received: from localhost.localdomain (10.69.192.58) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.439.0; Wed, 13 Nov 2019 21:40:14 +0800 From: John Garry To: , , CC: , , , , , , , John Garry Subject: [PATCH RFC 0/5] blk-mq/scsi: Provide hostwide shared tags for SCSI HBAs Date: Wed, 13 Nov 2019 21:36:44 +0800 Message-ID: <1573652209-163505-1-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 MIME-Version: 1.0 X-Originating-IP: [10.69.192.58] X-CFilter-Loop: Reflected Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org This is a 2nd stab at solving the problem of hostwide shared tags for SCSI HBAs. As discussed previously, Ming Lei's most recent series in [0] to use hctx[0] tags for all hctx for a host was a bit messy and intrusive, so seen as a no go. Indeed, blk-mq is designed for separate tags per hctx. This series introduces a different approach to solve that problem, in keeping the per-hctx tags but introducing a new separate shared set of tags, which SCSI HBAs can use for a hostwide tags. Adding support for shared tags should not have a significant performance impact for when shared tags are not requested. Currently I just fixed up the hisi_sas driver to use the shared tags, but should not be much trouble to change others over. Patch #3 is quite experimental at this point. I also threw in a minor tidy-up patch. [0] https://lore.kernel.org/linux-block/20190531022801.10003-1-ming.lei@redhat.com/ Hannes Reinecke (1): scsi: Add template flag 'host_tagset' John Garry (3): blk-mq: Remove some unused function arguments blk-mq: Facilitate a shared tags per tagset scsi: hisi_sas: Switch v3 hw to MQ Ming Lei (1): blk-mq: rename BLK_MQ_F_TAG_SHARED as BLK_MQ_F_TAG_QUEUE_SHARED block/blk-core.c | 1 + block/blk-flush.c | 2 + block/blk-mq-debugfs.c | 4 +- block/blk-mq-tag.c | 91 +++++++++++++++++++++++++- block/blk-mq-tag.h | 8 +-- block/blk-mq.c | 91 +++++++++++++++++++------- block/blk-mq.h | 11 +++- drivers/scsi/hisi_sas/hisi_sas.h | 3 +- drivers/scsi/hisi_sas/hisi_sas_main.c | 43 ++++++------ drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 85 ++++++++++-------------- drivers/scsi/scsi_lib.c | 2 + include/linux/blk-mq.h | 5 +- include/linux/blkdev.h | 1 + include/scsi/scsi_host.h | 3 + 14 files changed, 242 insertions(+), 108 deletions(-)