From patchwork Mon Jun 29 07:19:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 213658 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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, 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 C2DEEC433E0 for ; Mon, 29 Jun 2020 19:34:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B13D2206E2 for ; Mon, 29 Jun 2020 19:34:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729993AbgF2Ten (ORCPT ); Mon, 29 Jun 2020 15:34:43 -0400 Received: from mx2.suse.de ([195.135.220.15]:36630 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733145AbgF2Tb0 (ORCPT ); Mon, 29 Jun 2020 15:31:26 -0400 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 E6EB0B077; Mon, 29 Jun 2020 07:20:55 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , James Bottomley , Bart van Assche , Don Brace , John Garry , linux-scsi@vger.kernel.org, Hannes Reinecke Subject: [PATCHv5 00/22] scsi: enable reserved commands for LLDDs Date: Mon, 29 Jun 2020 09:19:59 +0200 Message-Id: <20200629072021.9864-1-hare@suse.de> X-Mailer: git-send-email 2.16.4 Sender: linux-scsi-owner@vger.kernel.org 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.v5 As usual, comments and reviews are welcome. 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 (22): scsi: drop gdth driver 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() csiostor: use internal command for LUN reset scsi: implement reserved command handling 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() 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 Documentation/kbuild/makefiles.rst | 4 +- Documentation/process/magic-number.rst | 2 - Documentation/scsi/scsi-parameters.rst | 3 - Documentation/userspace-api/ioctl/ioctl-number.rst | 1 - block/blk-exec.c | 5 + drivers/scsi/Kconfig | 14 - drivers/scsi/Makefile | 2 - drivers/scsi/aacraid/aachba.c | 137 +- drivers/scsi/aacraid/aacraid.h | 9 +- drivers/scsi/aacraid/commctrl.c | 25 +- drivers/scsi/aacraid/comminit.c | 2 +- drivers/scsi/aacraid/commsup.c | 106 +- drivers/scsi/aacraid/dpcsup.c | 2 +- drivers/scsi/aacraid/linit.c | 175 +- drivers/scsi/csiostor/csio_scsi.c | 48 +- drivers/scsi/fnic/fnic_scsi.c | 944 ++--- drivers/scsi/gdth.c | 4323 -------------------- drivers/scsi/gdth.h | 981 ----- drivers/scsi/gdth_ioctl.h | 251 -- drivers/scsi/gdth_proc.c | 586 --- drivers/scsi/gdth_proc.h | 18 - drivers/scsi/hpsa.c | 368 +- drivers/scsi/hpsa.h | 3 +- drivers/scsi/hpsa_cmd.h | 1 - drivers/scsi/scsi_devinfo.c | 1 + drivers/scsi/scsi_lib.c | 54 +- 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/scsi_device.h | 4 + include/scsi/scsi_host.h | 25 +- 35 files changed, 1243 insertions(+), 7493 deletions(-) delete mode 100644 drivers/scsi/gdth.c delete mode 100644 drivers/scsi/gdth.h delete mode 100644 drivers/scsi/gdth_ioctl.h delete mode 100644 drivers/scsi/gdth_proc.c delete mode 100644 drivers/scsi/gdth_proc.h