From patchwork Fri May 29 13:39:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 213852 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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 6D7FDC433DF for ; Fri, 29 May 2020 13:39:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 50EC6206F1 for ; Fri, 29 May 2020 13:39:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726838AbgE2Njs (ORCPT ); Fri, 29 May 2020 09:39:48 -0400 Received: from mx2.suse.de ([195.135.220.15]:59378 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726476AbgE2Njr (ORCPT ); Fri, 29 May 2020 09:39:47 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 9F281AF16; Fri, 29 May 2020 13:39:45 +0000 (UTC) From: Hannes Reinecke To: "Martin K. Petersen" Cc: Christoph Hellwig , James Bottomley , Doug Gilbert , linux-scsi@vger.kernel.org, Hannes Reinecke Subject: [PATCH] scsi_debug: implement 'sdebug_lun_format' and update max_lun Date: Fri, 29 May 2020 15:39:42 +0200 Message-Id: <20200529133942.146413-1-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 Implement 'flat space LUN addressing', which allows us to raise the max_lun limitation to 16384. Signed-off-by: Hannes Reinecke --- drivers/scsi/scsi_debug.c | 66 +++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 61 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 4c6c448dc2df..b486d6a34d22 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -204,8 +204,8 @@ static const char *sdebug_version_date = "20190125"; #define OPT_MEDIUM_ERR_ADDR 0x1234 /* that's sector 4660 in decimal */ #define OPT_MEDIUM_ERR_NUM 10 /* number of consecutive medium errs */ -/* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1) - * or "peripheral device" addressing (value 0) */ +/* If REPORT LUNS has luns >= 256 it should choose "flat space" (value 1) + * instead of "peripheral device" addressing (value 0) */ #define SAM2_LUN_ADDRESS_METHOD 0 /* SDEBUG_CANQUEUE is the maximum number of commands that can be queued @@ -666,6 +666,7 @@ static bool have_dif_prot; static bool write_since_sync; static bool sdebug_statistics = DEF_STATISTICS; static bool sdebug_wp; +static int sdebug_lun_format = SAM2_LUN_ADDRESS_METHOD; static unsigned int sdebug_store_sectors; static sector_t sdebug_capacity; /* in sectors */ @@ -3676,6 +3677,8 @@ static int resp_report_luns(struct scsi_cmnd *scp, if ((k * RL_BUCKET_ELEMS) + j > lun_cnt) break; int_to_scsilun(lun++, lun_p); + if (lun > 1 && sdebug_lun_format == 1) + lun_p->scsi_lun[0] |= 0x40; } if (j < RL_BUCKET_ELEMS) break; @@ -3834,6 +3837,7 @@ static struct sdebug_dev_info *find_build_dev_info(struct scsi_device *sdev) pr_err("Host info NULL\n"); return NULL; } + list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) { if ((devip->used) && (devip->channel == sdev->channel) && (devip->target == sdev->id) && @@ -4438,6 +4442,7 @@ module_param_named(lbpws, sdebug_lbpws, int, S_IRUGO); module_param_named(lbpws10, sdebug_lbpws10, int, S_IRUGO); module_param_named(lbprz, sdebug_lbprz, int, S_IRUGO); module_param_named(lowest_aligned, sdebug_lowest_aligned, int, S_IRUGO); +module_param_named(lun_format, sdebug_lun_format, int, S_IRUGO | S_IWUSR); module_param_named(max_luns, sdebug_max_luns, int, S_IRUGO | S_IWUSR); module_param_named(max_queue, sdebug_max_queue, int, S_IRUGO | S_IWUSR); module_param_named(medium_error_start, sdebug_medium_error_start, int, S_IRUGO | S_IWUSR); @@ -4499,6 +4504,7 @@ MODULE_PARM_DESC(lbprz, "on read unmapped LBs return 0 when 1 (def), return 0xff when 2"); MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)"); MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)"); +MODULE_PARM_DESC(lun_format, "LUN format to use(def=0)"); MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to max(def))"); MODULE_PARM_DESC(medium_error_start, "starting sector number to return MEDIUM error"); MODULE_PARM_DESC(medium_error_count, "count of sectors to return follow on MEDIUM error"); @@ -4860,6 +4866,44 @@ static ssize_t every_nth_store(struct device_driver *ddp, const char *buf, } static DRIVER_ATTR_RW(every_nth); +static ssize_t lun_format_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_lun_format); +} +static ssize_t lun_format_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + bool changed; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + if (n > 2) { + pr_warn("only formats 0 and 1 are supported\n"); + return -EINVAL; + } + changed = (sdebug_lun_format != n); + sdebug_lun_format = n; + if (changed && (sdebug_scsi_level >= 5)) { /* >= SPC-3 */ + struct sdebug_host_info *sdhp; + struct sdebug_dev_info *dp; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdhp, &sdebug_host_list, + host_list) { + list_for_each_entry(dp, &sdhp->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_LUNS_CHANGED, + dp->uas_bm); + } + } + spin_unlock(&sdebug_host_list_lock); + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(lun_format); + static ssize_t max_luns_show(struct device_driver *ddp, char *buf) { return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_max_luns); @@ -5197,6 +5241,7 @@ static struct attribute *sdebug_drv_attrs[] = { &driver_attr_dev_size_mb.attr, &driver_attr_num_parts.attr, &driver_attr_every_nth.attr, + &driver_attr_lun_format.attr, &driver_attr_max_luns.attr, &driver_attr_max_queue.attr, &driver_attr_no_uld.attr, @@ -5283,9 +5328,19 @@ static int __init scsi_debug_init(void) pr_err("invalid physblk_exp %u\n", sdebug_physblk_exp); return -EINVAL; } + + if (sdebug_lun_format > 2) { + pr_warn("Invalid LUN format %u, using default\n", + sdebug_lun_format); + sdebug_lun_format = SAM2_LUN_ADDRESS_METHOD; + } + if (sdebug_max_luns > 256) { - pr_warn("max_luns can be no more than 256, use default\n"); - sdebug_max_luns = DEF_MAX_LUNS; + if (sdebug_max_luns > 16384) { + pr_warn("max_luns can be no more than 16384, use default\n"); + sdebug_max_luns = DEF_MAX_LUNS; + } + sdebug_lun_format = 1; } if (sdebug_lowest_aligned > 0x3fff) { @@ -5600,6 +5655,7 @@ static int scsi_debug_queuecommand(struct Scsi_Host *shost, int (*pfp)(struct scsi_cmnd *, struct sdebug_dev_info *) = NULL; int k, na; int errsts = 0; + u64 lun_index = sdp->lun & 0x3FFF; u32 flags; u16 sa; u8 opcode = cmd[0]; @@ -5628,7 +5684,7 @@ static int scsi_debug_queuecommand(struct Scsi_Host *shost, if (fake_host_busy(scp)) return SCSI_MLQUEUE_HOST_BUSY; has_wlun_rl = (sdp->lun == SCSI_W_LUN_REPORT_LUNS); - if (unlikely((sdp->lun >= sdebug_max_luns) && !has_wlun_rl)) + if (unlikely((lun_index >= sdebug_max_luns) && !has_wlun_rl)) goto err_out; sdeb_i = opcode_ind_arr[opcode]; /* fully mapped */