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=-12.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,MIME_HEADER_CTYPE_ONLY,MIME_NO_TEXT, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_TVD_MIME_NO_HEADERS,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 AED80C433E7 for ; Wed, 14 Oct 2020 12:27:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1CF0720878 for ; Wed, 14 Oct 2020 12:27:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="KckdTC98" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730097AbgJNM1W (ORCPT ); Wed, 14 Oct 2020 08:27:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40698 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730076AbgJNM1W (ORCPT ); Wed, 14 Oct 2020 08:27:22 -0400 Received: from mail-ej1-x644.google.com (mail-ej1-x644.google.com [IPv6:2a00:1450:4864:20::644]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B282DC061755 for ; Wed, 14 Oct 2020 05:27:21 -0700 (PDT) Received: by mail-ej1-x644.google.com with SMTP id md26so4520515ejb.10 for ; Wed, 14 Oct 2020 05:27:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id; bh=seFOJB8KjOruN23XxQ3/bn14ZIW3xOHNVbEKXmL/xYg=; b=KckdTC98GxTmdYmF7l58w2zEhE+1rno8mJlNPlj/tnN3opOpp8nX3l3DhaPJzXPNp9 nvv+5MB8650VJk7DedzfXvRa52RJeO45O3OSUc5H+L0XFT2zHFlKuRp3y4ERLTh3KT6M VvDnyxJCrprBjrh+93Y0ckkfWlNN2jJGryGFo= 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; bh=seFOJB8KjOruN23XxQ3/bn14ZIW3xOHNVbEKXmL/xYg=; b=HjizNKAU/4WqdoGluVUfl15BRkpN0df0mMt3NEYhCo2j0d1TDWZZ7IJOxzLIZPRB/H F01hBR0VMM3SmIF5hHvJtlZajM412kH33GuB4D1PGfIdCYVDNgs0XAyVg+n962hbgGgb OURdmpO5pwVZbrpZ3fFVr+LZ/V2eEN2b/xj5PQePscxuf4DTe15rOUQS+a0WqsoAeJ03 Zb9Prc80L70oV0otY/VBhspj17wO5uz1Mq7/ctoEXhFetiZyL/+5CAXv4AzoMM4ZtE2Y O5cy1SIU9mE8yUNAASjxr+UPjsntyzjIGmqUyxlr4lekdctqooW1wayKPj0sgoY8Piyl w5wg== X-Gm-Message-State: AOAM533Y6Bh3tiBM4XsnJduyxF+Jl+RLHhG0OQSL45h2+q5mdhnMoLLx zdX44tXyGhl41nDYMDlkn4PHhg== X-Google-Smtp-Source: ABdhPJxNLJKaMwJd1yL3KpGxW4/Ct33sHCHdjl8tiSSKUY0eRNcPjo5OpG7lUt5H27O2m7jx5aPGAg== X-Received: by 2002:a17:906:4941:: with SMTP id f1mr5193299ejt.417.1602678440182; Wed, 14 Oct 2020 05:27:20 -0700 (PDT) Received: from drv-bst-rhel8.static.broadcom.net ([192.19.234.250]) by smtp.gmail.com with ESMTPSA id pw17sm1619676ejb.116.2020.10.14.05.27.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Oct 2020 05:27:18 -0700 (PDT) From: Kashyap Desai To: linux-scsi@vger.kernel.org Cc: Kashyap Desai , sumit.saxena@broadcom.com, chandrakanth.patil@broadcom.com, linux-block@vger.kernel.org Subject: [PATCH 2/3] megaraid_sas: iouring iopoll support Date: Wed, 14 Oct 2020 17:56:55 +0530 Message-Id: <20201014122655.201272-1-kashyap.desai@broadcom.com> X-Mailer: git-send-email 2.18.1 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000002498ac05b1a0a7a5" Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org --0000000000002498ac05b1a0a7a5 Add support of iouring iopoll interface. This feature requires shared hosttag support in kernel and driver. Driver will work in non-IRQ mode = There will not be any msix vector associated for poll_queues and h/w can still work in this mode. MegaRaid h/w is single submission queue and multiple reply queue, but using shared host tagset support it will enable simulated multiple hw queue. Driver allocates some extra reply queues and it will be marked as poll_queue. These poll_queues will not have associated msix vectors. All the IO completion on this queue will be done from IOPOLL interface. megaraid_sas driver having 8 poll_queues and using io_uring hiprio=1 settings, It can reach 3.2M IOPs and there is zero interrupt generated by h/w. This feature can be enabled using module parameter poll_queues. Signed-off-by: Kashyap Desai Cc: sumit.saxena@broadcom.com Cc: chandrakanth.patil@broadcom.com Cc: linux-block@vger.kernel.org --- drivers/scsi/megaraid/megaraid_sas.h | 2 + drivers/scsi/megaraid/megaraid_sas_base.c | 90 ++++++++++++++++++--- drivers/scsi/megaraid/megaraid_sas_fusion.c | 43 +++++++++- drivers/scsi/megaraid/megaraid_sas_fusion.h | 3 + 4 files changed, 127 insertions(+), 11 deletions(-) diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h index 5e4137f10e0e..4bf6fde49565 100644 --- a/drivers/scsi/megaraid/megaraid_sas.h +++ b/drivers/scsi/megaraid/megaraid_sas.h @@ -2212,6 +2212,7 @@ struct megasas_irq_context { struct irq_poll irqpoll; bool irq_poll_scheduled; bool irq_line_enable; + atomic_t in_used; }; struct MR_DRV_SYSTEM_INFO { @@ -2446,6 +2447,7 @@ struct megasas_instance { bool support_pci_lane_margining; u8 low_latency_index_start; int perf_mode; + int iopoll_q_count; }; struct MR_LD_VF_MAP { diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 020270ce790b..e2c307523a8a 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -114,6 +114,15 @@ unsigned int enable_sdev_max_qd; module_param(enable_sdev_max_qd, int, 0444); MODULE_PARM_DESC(enable_sdev_max_qd, "Enable sdev max qd as can_queue. Default: 0"); +int poll_queues; +module_param(poll_queues, int, 0444); +MODULE_PARM_DESC(poll_queues, "Number of queues to be use for io_uring poll mode.\n\t\t" + "This parameter is effective only if host_tagset_enable=1 &\n\t\t" + "It is not applicable for MFI_SERIES. &\n\t\t" + "Driver will work in latency mode. &\n\t\t" + "High iops queues are not allocated &\n\t\t" + ); + int host_tagset_enable = 1; module_param(host_tagset_enable, int, 0444); MODULE_PARM_DESC(host_tagset_enable, "Shared host tagset enable/disable Default: enable(1)"); @@ -207,6 +216,7 @@ static bool support_pci_lane_margining; static spinlock_t poll_aen_lock; extern struct dentry *megasas_debugfs_root; +extern int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num); void megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd, @@ -3127,14 +3137,45 @@ megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev, static int megasas_map_queues(struct Scsi_Host *shost) { struct megasas_instance *instance; + int i, qoff, offset; instance = (struct megasas_instance *)shost->hostdata; if (shost->nr_hw_queues == 1) return 0; - return blk_mq_pci_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT], - instance->pdev, instance->low_latency_index_start); + offset = instance->low_latency_index_start; + + 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 = instance->msix_vectors - offset; + else if (i == HCTX_TYPE_POLL) + map->nr_queues = instance->iopoll_q_count; + + if (!map->nr_queues) { + BUG_ON(i == HCTX_TYPE_DEFAULT); + continue; + } + + /* + * The poll queue(s) doesn't have an IRQ (and hence IRQ + * affinity), so use the regular blk-mq cpu mapping + */ + map->queue_offset = qoff; + if (i != HCTX_TYPE_POLL) + blk_mq_pci_map_queues(map, instance->pdev, offset); + else + blk_mq_map_queues(map); + + qoff += map->nr_queues; + offset += map->nr_queues; + } + + return 0; } static void megasas_aen_polling(struct work_struct *work); @@ -3446,6 +3487,7 @@ static struct scsi_host_template megasas_template = { .shost_attrs = megaraid_host_attrs, .bios_param = megasas_bios_param, .map_queues = megasas_map_queues, + .mq_poll = megasas_blk_mq_poll, .change_queue_depth = scsi_change_queue_depth, .max_segment_size = 0xffffffff, }; @@ -5834,13 +5876,16 @@ __megasas_alloc_irq_vectors(struct megasas_instance *instance) irq_flags = PCI_IRQ_MSIX; if (instance->smp_affinity_enable) - irq_flags |= PCI_IRQ_AFFINITY; + irq_flags |= PCI_IRQ_AFFINITY | PCI_IRQ_ALL_TYPES; else descp = NULL; + /* Do not allocate msix vectors for poll_queues. + * msix_vectors is always within a range of FW supported reply queue. + */ i = pci_alloc_irq_vectors_affinity(instance->pdev, instance->low_latency_index_start, - instance->msix_vectors, irq_flags, descp); + instance->msix_vectors - instance->iopoll_q_count, irq_flags, descp); return i; } @@ -5856,10 +5901,25 @@ megasas_alloc_irq_vectors(struct megasas_instance *instance) int i; unsigned int num_msix_req; + instance->iopoll_q_count = 0; + if ((instance->adapter_type != MFI_SERIES) && + poll_queues) { + + instance->perf_mode = MR_LATENCY_PERF_MODE; + instance->low_latency_index_start = 1; + + /* reserve for default and non-mananged pre-vector. */ + if (instance->msix_vectors > (instance->iopoll_q_count + 2)) + instance->iopoll_q_count = poll_queues; + else + instance->iopoll_q_count = 0; + } + i = __megasas_alloc_irq_vectors(instance); - if ((instance->perf_mode == MR_BALANCED_PERF_MODE) && - (i != instance->msix_vectors)) { + if (((instance->perf_mode == MR_BALANCED_PERF_MODE) + || instance->iopoll_q_count) && + (i != (instance->msix_vectors - instance->iopoll_q_count))) { if (instance->msix_vectors) pci_free_irq_vectors(instance->pdev); /* Disable Balanced IOPS mode and try realloc vectors */ @@ -5870,12 +5930,15 @@ megasas_alloc_irq_vectors(struct megasas_instance *instance) instance->msix_vectors = min(num_msix_req, instance->msix_vectors); + instance->iopoll_q_count = 0; i = __megasas_alloc_irq_vectors(instance); } dev_info(&instance->pdev->dev, - "requested/available msix %d/%d\n", instance->msix_vectors, i); + "requested/available msix %d/%d poll_queue %d\n", + instance->msix_vectors - instance->iopoll_q_count, + i, instance->iopoll_q_count); if (i > 0) instance->msix_vectors = i; @@ -6841,12 +6904,18 @@ static int megasas_io_attach(struct megasas_instance *instance) instance->smp_affinity_enable) { host->host_tagset = 1; host->nr_hw_queues = instance->msix_vectors - - instance->low_latency_index_start; + instance->low_latency_index_start + instance->iopoll_q_count; + if (instance->iopoll_q_count) + host->nr_maps = 3; + } else { + instance->iopoll_q_count = 0; } dev_info(&instance->pdev->dev, - "Max firmware commands: %d shared with nr_hw_queues = %d\n", - instance->max_fw_cmds, host->nr_hw_queues); + "Max firmware commands: %d shared with default " + "hw_queues = %d poll_queues %d\n", instance->max_fw_cmds, + host->nr_hw_queues - instance->iopoll_q_count, + instance->iopoll_q_count); /* * Notify the mid-layer about the new controller */ @@ -8907,6 +8976,7 @@ static int __init megasas_init(void) msix_vectors = 1; rdpq_enable = 0; dual_qdepth_disable = 1; + poll_queues = 0; } /* diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c index fd607287608e..49c8cc3507e0 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.c +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c @@ -685,6 +685,8 @@ megasas_alloc_reply_fusion(struct megasas_instance *instance) fusion = instance->ctrl_context; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + count += instance->iopoll_q_count; + fusion->reply_frames_desc_pool = dma_pool_create("mr_reply", &instance->pdev->dev, fusion->reply_alloc_sz * count, 16, 0); @@ -779,6 +781,7 @@ megasas_alloc_rdpq_fusion(struct megasas_instance *instance) } msix_count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + msix_count += instance->iopoll_q_count; fusion->reply_frames_desc_pool = dma_pool_create("mr_rdpq", &instance->pdev->dev, @@ -1129,7 +1132,7 @@ megasas_ioc_init_fusion(struct megasas_instance *instance) MPI2_IOCINIT_MSGFLAG_RDPQ_ARRAY_MODE : 0; IOCInitMessage->SystemRequestFrameBaseAddress = cpu_to_le64(fusion->io_request_frames_phys); IOCInitMessage->SenseBufferAddressHigh = cpu_to_le32(upper_32_bits(fusion->sense_phys_addr)); - IOCInitMessage->HostMSIxVectors = instance->msix_vectors; + IOCInitMessage->HostMSIxVectors = instance->msix_vectors + instance->iopoll_q_count; IOCInitMessage->HostPageSize = MR_DEFAULT_NVME_PAGE_SHIFT; time = ktime_get_real(); @@ -1823,6 +1826,8 @@ megasas_init_adapter_fusion(struct megasas_instance *instance) sizeof(union MPI2_SGE_IO_UNION))/16; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + count += instance->iopoll_q_count; + for (i = 0 ; i < count; i++) fusion->last_reply_idx[i] = 0; @@ -1835,6 +1840,9 @@ megasas_init_adapter_fusion(struct megasas_instance *instance) MEGASAS_FUSION_IOCTL_CMDS); sema_init(&instance->ioctl_sem, MEGASAS_FUSION_IOCTL_CMDS); + for (i = 0; i < MAX_MSIX_QUEUES_FUSION; i++) + atomic_set(&fusion->busy_mq_poll[i], 0); + if (megasas_alloc_ioc_init_frame(instance)) return 1; @@ -3500,6 +3508,9 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, if (reply_descript_type == MPI2_RPY_DESCRIPT_FLAGS_UNUSED) return IRQ_NONE; + if (irq_context && !atomic_add_unless(&irq_context->in_used, 1, 1)) + return 0; + num_completed = 0; while (d_val.u.low != cpu_to_le32(UINT_MAX) && @@ -3613,6 +3624,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, irq_context->irq_line_enable = true; irq_poll_sched(&irq_context->irqpoll); } + atomic_dec(&irq_context->in_used); return num_completed; } } @@ -3630,9 +3642,36 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex, instance->reply_post_host_index_addr[0]); megasas_check_and_restore_queue_depth(instance); } + + if (irq_context) + atomic_dec(&irq_context->in_used); + return num_completed; } +int megasas_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) +{ + + struct megasas_instance *instance; + int num_entries = 0; + struct fusion_context *fusion; + + instance = (struct megasas_instance *)shost->hostdata; + + fusion = instance->ctrl_context; + + queue_num = queue_num + instance->low_latency_index_start; + + if (!atomic_add_unless(&fusion->busy_mq_poll[queue_num], 1, 1)) + return 0; + + num_entries = complete_cmd_fusion(instance, queue_num, NULL); + atomic_dec(&fusion->busy_mq_poll[queue_num]); + + return num_entries; +} + + /** * megasas_enable_irq_poll() - enable irqpoll * @instance: Adapter soft state @@ -4164,6 +4203,8 @@ void megasas_reset_reply_desc(struct megasas_instance *instance) fusion = instance->ctrl_context; count = instance->msix_vectors > 0 ? instance->msix_vectors : 1; + count += instance->iopoll_q_count; + for (i = 0 ; i < count ; i++) { fusion->last_reply_idx[i] = 0; reply_desc = fusion->reply_frames_desc[i]; diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h index 30de4b01f703..242ff58a3404 100644 --- a/drivers/scsi/megaraid/megaraid_sas_fusion.h +++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h @@ -1303,6 +1303,9 @@ struct fusion_context { u8 *sense; dma_addr_t sense_phys_addr; + atomic_t busy_mq_poll[MAX_MSIX_QUEUES_FUSION]; + + dma_addr_t reply_frames_desc_phys[MAX_MSIX_QUEUES_FUSION]; union MPI2_REPLY_DESCRIPTORS_UNION *reply_frames_desc[MAX_MSIX_QUEUES_FUSION]; struct rdpq_alloc_detail rdpq_tracker[RDPQ_MAX_CHUNK_COUNT]; -- 2.18.1 --0000000000002498ac05b1a0a7a5 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature 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