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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,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 C26C2C433DB for ; Mon, 22 Feb 2021 13:28:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6916E64E74 for ; Mon, 22 Feb 2021 13:28:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230496AbhBVN1f (ORCPT ); Mon, 22 Feb 2021 08:27:35 -0500 Received: from mx2.suse.de ([195.135.220.15]:45138 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231620AbhBVNY6 (ORCPT ); Mon, 22 Feb 2021 08:24:58 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 71E79AE47; Mon, 22 Feb 2021 13:24:15 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: James Bottomley , Christoph Hellwig , John Garry , linux-scsi@vger.kernel.org, Hannes Reinecke Subject: [PATCHv7 00/31] scsi: enable reserved commands for LLDDs Date: Mon, 22 Feb 2021 14:23:34 +0100 Message-Id: <20210222132405.91369-1-hare@suse.de> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Hi all, quite some drivers use internal commands for various purposes, most commonly sending TMFs or querying the HBA status. While these commands use the same submission mechanism than normal I/O commands, they will not be counted as outstanding commands, requiring those drivers to implement their own mechanism to figure out outstanding commands. The block layer already has the concept of 'reserved' tags for precisely this purpose, namely non-I/O tags which live off a separate tag pool. That guarantees that these commands can always be sent, and won't be influenced by tag starvation from the I/O tag pool. This patchset enables the use of reserved tags for the SCSI midlayer by allocating a virtual LUN for the HBA itself which just serves as a resource to allocate valid tags from. This removes quite some hacks which were required for some drivers (eg. fnic or snic), and allows the use of tagset iterators within the drivers. The entire patchset can be found at git://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git reserved-tags.v7 As usual, comments and reviews are welcome. Changes to v6: - Remove patch to drop gdth - Rework libsas to use a tag per slow task - Update hisi_sas, pm8001, and mv_sas Changes to v5: - Remove patch for csiostor - Warn on normal commands in scsi_put_reserved_cmd() - Fixup aacraid to not only scsi_put_internal_cmd() for reserved commands - Add 'nr_reserved_cmds' field to host template - Reshuffle patches Changes to v4: - Fixup kbuild warning - Include reviews from Bart Changes to v3: - Kill gdth - Only convert fnic, snic, hpsa, and aacraid - Drop command emulation for pseudo host device - make 'can_queue' exclude the number or reserved tags - Drop persistent commands proposal - Sanitize host device handling Changes to v2: - Update patches from John Garry - Use virtual LUN as suggested by Christoph - Improve SCSI Host device to present a real SCSI device - Implement 'persistent' commands for AENs - Convert Megaraid SAS Changes to v1: - Make scsi_{get, put}_reserved_cmd() for Scsi host - Previously we separate scsi_{get, put}_reserved_cmd() for sdev and scsi_host_get_reserved_cmd() for the host - Fix how Scsi_Host.can_queue is set in the virtio-scsi change - Drop Scsi_Host.use_reserved_cmd_q - Drop scsi_is_reserved_cmd() - Add support in libsas and associated HBA drivers - Allocate reserved command in slow task - Switch hisi_sas to use reserved Scsi command - Reorder the series a little - Some tidying Hannes Reinecke (29): block: add flag for internal commands scsi: add scsi_{get,put}_internal_cmd() helper fnic: use internal commands fnic: use scsi_host_busy_iter() to traverse commands fnic: check for started requests in fnic_wq_copy_cleanup_handler() scsi: use real inquiry data when initialising devices scsi: Use dummy inquiry data for the host device scsi: revamp host device handling snic: use reserved commands snic: use tagset iter for traversing commands snic: check for started requests in snic_hba_reset_cmpl_handler() scsi: implement reserved command handling hpsa: move hpsa_hba_inquiry after scsi_add_host() hpsa: use reserved commands hpsa: use scsi_host_busy_iter() to traverse outstanding commands hpsa: drop refcount field from CommandList aacraid: move scsi_add_host() aacraid: store target id in host_scribble aacraid: use scsi_get_internal_cmd() aacraid: use scsi_host_busy_iter() to traverse outstanding commands mv_sas: kill mvsas_debug_issue_ssp_tmf() pm8001: kill pm8001_issue_ssp_tmf() pm8001: kill 'dev' argument from pm8001_exec_internal_task_abort() pm8001: use libsas-provided domain devices for SATA libsas: add SCSI target pointer to struct domain_device libsas: add tag to struct sas_task hisi_sas: use task tag to reference the slot mv_sas: use reserved tags and drop private tag allocation pm8001: use block-layer tags for ccb allocation John Garry (2): scsi: libsas,hisi_sas,mvsas,pm8001: Allocate Scsi_cmd for slow task scsi: hisi_sas: Use libsas slow task SCSI command block/blk-exec.c | 5 + drivers/scsi/aacraid/aachba.c | 137 ++-- drivers/scsi/aacraid/aacraid.h | 10 +- drivers/scsi/aacraid/commctrl.c | 25 +- drivers/scsi/aacraid/comminit.c | 2 +- drivers/scsi/aacraid/commsup.c | 109 ++- drivers/scsi/aacraid/dpcsup.c | 2 +- drivers/scsi/aacraid/linit.c | 175 +++-- drivers/scsi/fnic/fnic_scsi.c | 944 +++++++++++-------------- drivers/scsi/hisi_sas/hisi_sas.h | 1 - drivers/scsi/hisi_sas/hisi_sas_main.c | 137 ++-- drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 5 +- drivers/scsi/hosts.c | 3 + drivers/scsi/hpsa.c | 368 +++++----- drivers/scsi/hpsa.h | 3 +- drivers/scsi/hpsa_cmd.h | 1 - drivers/scsi/libsas/sas_ata.c | 4 + drivers/scsi/libsas/sas_expander.c | 7 +- drivers/scsi/libsas/sas_init.c | 63 +- drivers/scsi/libsas/sas_scsi_host.c | 4 +- drivers/scsi/mvsas/mv_init.c | 10 +- drivers/scsi/mvsas/mv_sas.c | 136 +--- drivers/scsi/mvsas/mv_sas.h | 13 +- drivers/scsi/pm8001/pm8001_hwi.c | 154 ++-- drivers/scsi/pm8001/pm8001_init.c | 24 +- drivers/scsi/pm8001/pm8001_sas.c | 193 +++-- drivers/scsi/pm8001/pm8001_sas.h | 14 +- drivers/scsi/pm8001/pm80xx_hwi.c | 143 ++-- drivers/scsi/scsi_devinfo.c | 1 + drivers/scsi/scsi_lib.c | 55 +- drivers/scsi/scsi_scan.c | 96 ++- drivers/scsi/scsi_sysfs.c | 3 +- drivers/scsi/snic/snic.h | 4 +- drivers/scsi/snic/snic_main.c | 7 + drivers/scsi/snic/snic_scsi.c | 525 +++++++------- include/linux/blk_types.h | 2 + include/linux/blkdev.h | 5 + include/scsi/libsas.h | 11 +- include/scsi/scsi_device.h | 4 + include/scsi/scsi_host.h | 36 +- 40 files changed, 1647 insertions(+), 1794 deletions(-) -- 2.29.2