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=-17.1 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MIME_HEADER_CTYPE_ONLY,SPF_HELO_NONE,SPF_PASS, T_TVD_MIME_NO_HEADERS,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 E1519C433DB for ; Mon, 15 Feb 2021 16:07:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B397A64E0F for ; Mon, 15 Feb 2021 16:07:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230498AbhBOQGv (ORCPT ); Mon, 15 Feb 2021 11:06:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43430 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232295AbhBOPxK (ORCPT ); Mon, 15 Feb 2021 10:53:10 -0500 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 835ABC061793 for ; Mon, 15 Feb 2021 07:40:31 -0800 (PST) Received: by mail-pl1-x62f.google.com with SMTP id e9so3937972plh.3 for ; Mon, 15 Feb 2021 07:40:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=F4qvt6jEDQu3XxLz3I6NlTa5j3TVCdLexFMg/3quuaY=; b=FBKH1fF29eRWtQ3D7cyb6/K/rJb5IlU6J00eDRiL8qSjjc+ORNvGtHvynhwXdrq7nk JP1YebixgJJzWLZeaFCiEgAopp9gtcX8Xlnotvb1Y6uhxunBqPQd4gIlfvjjjxAX8Yrb ELkyYiU9pSVk7/4Kt46q51MFnG9dGr0YRXKXM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=F4qvt6jEDQu3XxLz3I6NlTa5j3TVCdLexFMg/3quuaY=; b=NY/YK9VgQlL3Bic23c5sx3j0Lkts5yktTXA2DWlXgaEaD9T0nPP1HDgCrPpW2kfk/R tNCAoa6AeUX0zzz3kap7NfppyKnHtvTgDnT3GYjDFM1dBMUSjF0KvXMiCe+XTQqeAyiN 2hu6lsdPy5okeDlLfjdRsPjuvV1gWCxBy5XDDAMYYhQA36KYIRQCL/IQe9Lr1JrqYy2k pq/ILTwEHobvHso+vyOpmI4QaEyeTaD8XfUhKaDUyd8EUHYKIwjbfh50CmbRtQWdzDBy x/gGMHWxPGFwQQSzfdsVzjnhfalvKuJKBIjdMglEQ3lhR7Ni9uJgAjQylHOkdtcV1ax0 U3iQ== X-Gm-Message-State: AOAM530Wyp+/WULWD6dPHY/JvTCWitLIqtg02FWaLpcZPw3P71uM+PHR eRonvmBxUmIn0U9fx6dOQCkMlw== X-Google-Smtp-Source: ABdhPJyjanhJfPLpz0gydaRnFwqFA7jxpasPnAvt4Woj44ITRya3pJJNq1N6LLuXoU8o1e/5PrDabQ== X-Received: by 2002:a17:90a:6947:: with SMTP id j7mr16595788pjm.151.1613403631047; Mon, 15 Feb 2021 07:40:31 -0800 (PST) Received: from drv-bst-rhel8.dhcp.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id m4sm18031341pgu.4.2021.02.15.07.40.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Feb 2021 07:40:30 -0800 (PST) From: Kashyap Desai To: linux-scsi@vger.kernel.org Cc: Kashyap Desai , dgilbert@interlog.com, linux-block@vger.kernel.org Subject: [PATCH v4 3/5] scsi_debug : iouring iopoll support Date: Mon, 15 Feb 2021 13:10:46 +0530 Message-Id: <20210215074048.19424-4-kashyap.desai@broadcom.com> X-Mailer: git-send-email 2.18.1 In-Reply-To: <20210215074048.19424-1-kashyap.desai@broadcom.com> References: <20210215074048.19424-1-kashyap.desai@broadcom.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000053358305bb61ce7a" Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org --00000000000053358305bb61ce7a Add support of iouring iopoll interface in scsi_debug. This feature requires shared hosttag support in kernel and driver. Signed-off-by: Kashyap Desai Acked-by: Douglas Gilbert Tested-by: Douglas Gilbert Reviewed-by: Hannes Reinecke Cc: dgilbert@interlog.com Cc: linux-block@vger.kernel.org --- drivers/scsi/scsi_debug.c | 130 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 130 insertions(+) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index d1b0cbe1b5f1..746eec521f79 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -829,6 +829,7 @@ static int sdeb_zbc_max_open = DEF_ZBC_MAX_OPEN_ZONES; static int sdeb_zbc_nr_conv = DEF_ZBC_NR_CONV_ZONES; static int submit_queues = DEF_SUBMIT_QUEUES; /* > 1 for multi-queue (mq) */ +static int poll_queues; /* iouring iopoll interface.*/ static struct sdebug_queue *sdebug_q_arr; /* ptr to array of submit queues */ static DEFINE_RWLOCK(atomic_rw); @@ -5432,6 +5433,14 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, cmnd->host_scribble = (unsigned char *)sqcp; sd_dp = sqcp->sd_dp; spin_unlock_irqrestore(&sqp->qc_lock, iflags); + + /* Do not complete IO from default completion path. + * Let it to be on queue. + * Completion should happen from mq_poll interface. + */ + if ((sqp - sdebug_q_arr) >= (submit_queues - poll_queues)) + return 0; + if (!sd_dp) { sd_dp = kzalloc(sizeof(*sd_dp), GFP_ATOMIC); if (!sd_dp) { @@ -5615,6 +5624,7 @@ module_param_named(sector_size, sdebug_sector_size, int, S_IRUGO); module_param_named(statistics, sdebug_statistics, bool, S_IRUGO | S_IWUSR); module_param_named(strict, sdebug_strict, bool, S_IRUGO | S_IWUSR); module_param_named(submit_queues, submit_queues, int, S_IRUGO); +module_param_named(poll_queues, poll_queues, int, S_IRUGO); module_param_named(tur_ms_to_ready, sdeb_tur_ms_to_ready, int, S_IRUGO); module_param_named(unmap_alignment, sdebug_unmap_alignment, int, S_IRUGO); module_param_named(unmap_granularity, sdebug_unmap_granularity, int, S_IRUGO); @@ -5677,6 +5687,7 @@ MODULE_PARM_DESC(opt_xferlen_exp, "optimal transfer length granularity exponent MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)"); MODULE_PARM_DESC(per_host_store, "If set, next positive add_host will get new store (def=0)"); MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)"); +MODULE_PARM_DESC(poll_queues, "support for iouring iopoll queues (1 to max(submit_queues - 1)"); MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])"); MODULE_PARM_DESC(random, "If set, uniformly randomize command duration between 0 and delay_in_ns"); MODULE_PARM_DESC(removable, "claim to have removable media (def=0)"); @@ -7201,6 +7212,104 @@ static int resp_not_ready(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) return check_condition_result; } +static int sdebug_map_queues(struct Scsi_Host *shost) +{ + int i, qoff; + + if (shost->nr_hw_queues == 1) + return 0; + + for (i = 0, qoff = 0; i < HCTX_MAX_TYPES; i++) { + struct blk_mq_queue_map *map = &shost->tag_set.map[i]; + + map->nr_queues = 0; + + if (i == HCTX_TYPE_DEFAULT) + map->nr_queues = submit_queues - poll_queues; + else if (i == HCTX_TYPE_POLL) + map->nr_queues = poll_queues; + + if (!map->nr_queues) { + BUG_ON(i == HCTX_TYPE_DEFAULT); + continue; + } + + map->queue_offset = qoff; + blk_mq_map_queues(map); + + qoff += map->nr_queues; + } + + return 0; + +} + +static int sdebug_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) +{ + int qc_idx; + int retiring = 0; + unsigned long iflags; + struct sdebug_queue *sqp; + struct sdebug_queued_cmd *sqcp; + struct scsi_cmnd *scp; + struct sdebug_dev_info *devip; + int num_entries = 0; + + sqp = sdebug_q_arr + queue_num; + + do { + spin_lock_irqsave(&sqp->qc_lock, iflags); + qc_idx = find_first_bit(sqp->in_use_bm, sdebug_max_queue); + if (unlikely((qc_idx < 0) || (qc_idx >= sdebug_max_queue))) + goto out; + + sqcp = &sqp->qc_arr[qc_idx]; + scp = sqcp->a_cmnd; + if (unlikely(scp == NULL)) { + pr_err("scp is NULL, queue_num=%d, qc_idx=%d from %s\n", + queue_num, qc_idx, __func__); + goto out; + } + devip = (struct sdebug_dev_info *)scp->device->hostdata; + if (likely(devip)) + atomic_dec(&devip->num_in_q); + else + pr_err("devip=NULL from %s\n", __func__); + if (unlikely(atomic_read(&retired_max_queue) > 0)) + retiring = 1; + + sqcp->a_cmnd = NULL; + if (unlikely(!test_and_clear_bit(qc_idx, sqp->in_use_bm))) { + pr_err("Unexpected completion sqp %p queue_num=%d qc_idx=%d from %s\n", + sqp, queue_num, qc_idx, __func__); + goto out; + } + + if (unlikely(retiring)) { /* user has reduced max_queue */ + int k, retval; + + retval = atomic_read(&retired_max_queue); + if (qc_idx >= retval) { + pr_err("index %d too large\n", retval); + goto out; + } + k = find_last_bit(sqp->in_use_bm, retval); + if ((k < sdebug_max_queue) || (k == retval)) + atomic_set(&retired_max_queue, 0); + else + atomic_set(&retired_max_queue, k + 1); + } + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + scp->scsi_done(scp); /* callback to mid level */ + num_entries++; + } while (1); + +out: + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + return num_entries; +} + + static int scsi_debug_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scp) { @@ -7380,6 +7489,8 @@ static struct scsi_host_template sdebug_driver_template = { .ioctl = scsi_debug_ioctl, .queuecommand = scsi_debug_queuecommand, .change_queue_depth = sdebug_change_qdepth, + .map_queues = sdebug_map_queues, + .mq_poll = sdebug_blk_mq_poll, .eh_abort_handler = scsi_debug_abort, .eh_device_reset_handler = scsi_debug_device_reset, .eh_target_reset_handler = scsi_debug_target_reset, @@ -7427,6 +7538,25 @@ static int sdebug_driver_probe(struct device *dev) if (sdebug_host_max_queue) hpnt->host_tagset = 1; + /* poll queues are possible for nr_hw_queues > 1 */ + if (hpnt->nr_hw_queues == 1 || (poll_queues < 1)) { + pr_warn("%s: trim poll_queues to 0. poll_q/nr_hw = (%d/%d)\n", + my_name, poll_queues, hpnt->nr_hw_queues); + poll_queues = 0; + } + + /* + * Poll queues don't need interrupts, but we need at least one I/O queue + * left over for non-polled I/O. + * If condition not met, trim poll_queues to 1 (just for simplicity). + */ + if (poll_queues >= submit_queues) { + pr_warn("%s: trim poll_queues to 1\n", my_name); + poll_queues = 1; + } + if (poll_queues) + hpnt->nr_maps = 3; + sdbg_host->shost = hpnt; *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host; if ((hpnt->this_id >= 0) && (sdebug_num_tgts > hpnt->this_id)) -- 2.18.1 --00000000000053358305bb61ce7a Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQRQYJKoZIhvcNAQcCoIIQNjCCEDICAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg2aMIIE6DCCA9CgAwIBAgIOSBtqCRO9gCTKXSLwFPMwDQYJKoZIhvcNAQELBQAwTDEgMB4GA1UE CxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMT Ckdsb2JhbFNpZ24wHhcNMTYwNjE1MDAwMDAwWhcNMjQwNjE1MDAwMDAwWjBdMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEzMDEGA1UEAxMqR2xvYmFsU2lnbiBQZXJzb25h 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