From patchwork Fri Aug 4 19:50:24 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: dann frazier X-Patchwork-Id: 797984 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=lists.ubuntu.com (client-ip=91.189.94.19; helo=huckleberry.canonical.com; envelope-from=kernel-team-bounces@lists.ubuntu.com; receiver=) Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) by ozlabs.org (Postfix) with ESMTP id 3xPHbc0YzMz9sN7; Sat, 5 Aug 2017 05:50:52 +1000 (AEST) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1ddicT-0004JT-1Z; Fri, 04 Aug 2017 19:50:49 +0000 Received: from complete.lackof.org ([198.49.126.79]) by huckleberry.canonical.com with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1ddicO-0004H5-UU for kernel-team@lists.ubuntu.com; Fri, 04 Aug 2017 19:50:45 +0000 Received: from localhost (c-107-2-141-92.hsd1.co.comcast.net [107.2.141.92]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by complete.lackof.org (Postfix) with ESMTPSA id C215233E00A1 for ; Fri, 4 Aug 2017 13:50:42 -0600 (MDT) From: dann frazier To: kernel-team@lists.ubuntu.com Subject: [PATCH 2/4][Unstable][Artful][SRU Zesty] scsi: hisi_sas: optimise the usage of hisi_hba.lock Date: Fri, 4 Aug 2017 13:50:24 -0600 Message-Id: <20170804195026.32028-3-dann.frazier@canonical.com> X-Mailer: git-send-email 2.13.3 In-Reply-To: <20170804195026.32028-1-dann.frazier@canonical.com> References: <20170804195026.32028-1-dann.frazier@canonical.com> X-Spam-Status: No, score=0.0 required=5.0 tests=UNPARSEABLE_RELAY autolearn=unavailable version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on complete.lackof.org X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.14 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com From: Xiang Chen BugLink: https://bugs.launchpad.net/bugs/1708734 Currently hisi_hba.lock is locked to deliver and receive a command to/from any hw queue. This causes much contention at high data-rates. To boost performance, lock on a per queue basis for sending and receiving commands to/from hw. Certain critical regions still need to be locked in the delivery and completion stages with hisi_hba.lock. New element hisi_sas_device.dq is added to store the delivery queue for a device, so it does not need to be needlessly re-calculated for every task. Signed-off-by: Xiang Chen Signed-off-by: John Garry Signed-off-by: Martin K. Petersen (cherry picked from commit b1a49412f0aed757e7632f9276acdf2fb8f3832e) Signed-off-by: dann frazier --- drivers/scsi/hisi_sas/hisi_sas.h | 9 +++-- drivers/scsi/hisi_sas/hisi_sas_main.c | 69 +++++++++++++++++++++++----------- drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 23 ++++-------- drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 34 ++++++++--------- 4 files changed, 77 insertions(+), 58 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h index b4e96fa90bc2..68ba7bd229e8 100644 --- a/drivers/scsi/hisi_sas/hisi_sas.h +++ b/drivers/scsi/hisi_sas/hisi_sas.h @@ -102,6 +102,8 @@ struct hisi_sas_cq { struct hisi_sas_dq { struct hisi_hba *hisi_hba; + struct hisi_sas_slot *slot_prep; + spinlock_t lock; int wr_point; int id; }; @@ -109,6 +111,7 @@ struct hisi_sas_dq { struct hisi_sas_device { struct hisi_hba *hisi_hba; struct domain_device *sas_device; + struct hisi_sas_dq *dq; struct list_head list; u64 attached_phy; atomic64_t running_req; @@ -154,9 +157,8 @@ struct hisi_sas_hw { struct domain_device *device); struct hisi_sas_device *(*alloc_dev)(struct domain_device *device); void (*sl_notify)(struct hisi_hba *hisi_hba, int phy_no); - int (*get_free_slot)(struct hisi_hba *hisi_hba, u32 dev_id, - int *q, int *s); - void (*start_delivery)(struct hisi_hba *hisi_hba); + int (*get_free_slot)(struct hisi_hba *hisi_hba, struct hisi_sas_dq *dq); + void (*start_delivery)(struct hisi_sas_dq *dq); int (*prep_ssp)(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot, int is_tmf, struct hisi_sas_tmf_task *tmf); @@ -217,7 +219,6 @@ struct hisi_hba { struct hisi_sas_port port[HISI_SAS_MAX_PHYS]; int queue_count; - struct hisi_sas_slot *slot_prep; struct dma_pool *sge_page_pool; struct hisi_sas_device devices[HISI_SAS_MAX_DEVICES]; diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index ee40f8e4314c..b3527230916b 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -179,10 +179,11 @@ static void hisi_sas_slot_abort(struct work_struct *work) task->task_done(task); } -static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba, - int is_tmf, struct hisi_sas_tmf_task *tmf, - int *pass) +static int hisi_sas_task_prep(struct sas_task *task, struct hisi_sas_dq + *dq, int is_tmf, struct hisi_sas_tmf_task *tmf, + int *pass) { + struct hisi_hba *hisi_hba = dq->hisi_hba; struct domain_device *device = task->dev; struct hisi_sas_device *sas_dev = device->lldd_dev; struct hisi_sas_port *port; @@ -240,18 +241,24 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba, } else n_elem = task->num_scatter; + spin_lock_irqsave(&hisi_hba->lock, flags); if (hisi_hba->hw->slot_index_alloc) rc = hisi_hba->hw->slot_index_alloc(hisi_hba, &slot_idx, device); else rc = hisi_sas_slot_index_alloc(hisi_hba, &slot_idx); - if (rc) + if (rc) { + spin_unlock_irqrestore(&hisi_hba->lock, flags); goto err_out; - rc = hisi_hba->hw->get_free_slot(hisi_hba, sas_dev->device_id, - &dlvry_queue, &dlvry_queue_slot); + } + spin_unlock_irqrestore(&hisi_hba->lock, flags); + + rc = hisi_hba->hw->get_free_slot(hisi_hba, dq); if (rc) goto err_out_tag; + dlvry_queue = dq->id; + dlvry_queue_slot = dq->wr_point; slot = &hisi_hba->slot_info[slot_idx]; memset(slot, 0, sizeof(struct hisi_sas_slot)); @@ -316,7 +323,7 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba, task->task_state_flags |= SAS_TASK_AT_INITIATOR; spin_unlock_irqrestore(&task->task_state_lock, flags); - hisi_hba->slot_prep = slot; + dq->slot_prep = slot; atomic64_inc(&sas_dev->running_req); ++(*pass); @@ -335,7 +342,9 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_hba *hisi_hba, err_out_slot_buf: /* Nothing to be done */ err_out_tag: + spin_lock_irqsave(&hisi_hba->lock, flags); hisi_sas_slot_index_free(hisi_hba, slot_idx); + spin_unlock_irqrestore(&hisi_hba->lock, flags); err_out: dev_err(dev, "task prep: failed[%d]!\n", rc); if (!sas_protocol_ata(task->task_proto)) @@ -354,19 +363,22 @@ static int hisi_sas_task_exec(struct sas_task *task, gfp_t gfp_flags, unsigned long flags; struct hisi_hba *hisi_hba = dev_to_hisi_hba(task->dev); struct device *dev = &hisi_hba->pdev->dev; + struct domain_device *device = task->dev; + struct hisi_sas_device *sas_dev = device->lldd_dev; + struct hisi_sas_dq *dq = sas_dev->dq; if (unlikely(test_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags))) return -EINVAL; /* protect task_prep and start_delivery sequence */ - spin_lock_irqsave(&hisi_hba->lock, flags); - rc = hisi_sas_task_prep(task, hisi_hba, is_tmf, tmf, &pass); + spin_lock_irqsave(&dq->lock, flags); + rc = hisi_sas_task_prep(task, dq, is_tmf, tmf, &pass); if (rc) dev_err(dev, "task exec: failed[%d]!\n", rc); if (likely(pass)) - hisi_hba->hw->start_delivery(hisi_hba); - spin_unlock_irqrestore(&hisi_hba->lock, flags); + hisi_hba->hw->start_delivery(dq); + spin_unlock_irqrestore(&dq->lock, flags); return rc; } @@ -421,12 +433,16 @@ static struct hisi_sas_device *hisi_sas_alloc_dev(struct domain_device *device) spin_lock(&hisi_hba->lock); for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) { if (hisi_hba->devices[i].dev_type == SAS_PHY_UNUSED) { + int queue = i % hisi_hba->queue_count; + struct hisi_sas_dq *dq = &hisi_hba->dq[queue]; + hisi_hba->devices[i].device_id = i; sas_dev = &hisi_hba->devices[i]; sas_dev->dev_status = HISI_SAS_DEV_NORMAL; sas_dev->dev_type = device->dev_type; sas_dev->hisi_hba = hisi_hba; sas_dev->sas_device = device; + sas_dev->dq = dq; INIT_LIST_HEAD(&hisi_hba->devices[i].list); break; } @@ -1135,8 +1151,9 @@ hisi_sas_internal_abort_task_exec(struct hisi_hba *hisi_hba, int device_id, struct hisi_sas_slot *slot; struct asd_sas_port *sas_port = device->port; struct hisi_sas_cmd_hdr *cmd_hdr_base; + struct hisi_sas_dq *dq = sas_dev->dq; int dlvry_queue_slot, dlvry_queue, n_elem = 0, rc, slot_idx; - unsigned long flags; + unsigned long flags, flags_dq; if (unlikely(test_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags))) return -EINVAL; @@ -1147,14 +1164,22 @@ hisi_sas_internal_abort_task_exec(struct hisi_hba *hisi_hba, int device_id, port = to_hisi_sas_port(sas_port); /* simply get a slot and send abort command */ + spin_lock_irqsave(&hisi_hba->lock, flags); rc = hisi_sas_slot_index_alloc(hisi_hba, &slot_idx); - if (rc) + if (rc) { + spin_unlock_irqrestore(&hisi_hba->lock, flags); goto err_out; - rc = hisi_hba->hw->get_free_slot(hisi_hba, sas_dev->device_id, - &dlvry_queue, &dlvry_queue_slot); + } + spin_unlock_irqrestore(&hisi_hba->lock, flags); + + spin_lock_irqsave(&dq->lock, flags_dq); + rc = hisi_hba->hw->get_free_slot(hisi_hba, dq); if (rc) goto err_out_tag; + dlvry_queue = dq->id; + dlvry_queue_slot = dq->wr_point; + slot = &hisi_hba->slot_info[slot_idx]; memset(slot, 0, sizeof(struct hisi_sas_slot)); @@ -1181,17 +1206,21 @@ hisi_sas_internal_abort_task_exec(struct hisi_hba *hisi_hba, int device_id, task->task_state_flags |= SAS_TASK_AT_INITIATOR; spin_unlock_irqrestore(&task->task_state_lock, flags); - hisi_hba->slot_prep = slot; + dq->slot_prep = slot; atomic64_inc(&sas_dev->running_req); - /* send abort command to our chip */ - hisi_hba->hw->start_delivery(hisi_hba); + /* send abort command to the chip */ + hisi_hba->hw->start_delivery(dq); + spin_unlock_irqrestore(&dq->lock, flags_dq); return 0; err_out_tag: + spin_lock_irqsave(&hisi_hba->lock, flags); hisi_sas_slot_index_free(hisi_hba, slot_idx); + spin_unlock_irqrestore(&hisi_hba->lock, flags); + spin_unlock_irqrestore(&dq->lock, flags_dq); err_out: dev_err(dev, "internal abort task prep: failed[%d]!\n", rc); @@ -1216,7 +1245,6 @@ hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba, struct hisi_sas_device *sas_dev = device->lldd_dev; struct device *dev = &hisi_hba->pdev->dev; int res; - unsigned long flags; if (!hisi_hba->hw->prep_abort) return -EOPNOTSUPP; @@ -1233,11 +1261,8 @@ hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba, task->slow_task->timer.expires = jiffies + msecs_to_jiffies(110); add_timer(&task->slow_task->timer); - /* Lock as we are alloc'ing a slot, which cannot be interrupted */ - spin_lock_irqsave(&hisi_hba->lock, flags); res = hisi_sas_internal_abort_task_exec(hisi_hba, sas_dev->device_id, task, abort_flag, tag); - spin_unlock_irqrestore(&hisi_hba->lock, flags); if (res) { del_timer(&task->slow_task->timer); dev_err(dev, "internal task abort: executing internal task failed: %d\n", diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c index fc1c1b2c1a19..7d7d2a7e690d 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c @@ -900,22 +900,17 @@ static int get_wideport_bitmap_v1_hw(struct hisi_hba *hisi_hba, int port_id) return bitmap; } -/** - * This function allocates across all queues to load balance. - * Slots are allocated from queues in a round-robin fashion. - * +/* * The callpath to this function and upto writing the write * queue pointer should be safe from interruption. */ -static int get_free_slot_v1_hw(struct hisi_hba *hisi_hba, u32 dev_id, - int *q, int *s) +static int +get_free_slot_v1_hw(struct hisi_hba *hisi_hba, struct hisi_sas_dq *dq) { struct device *dev = &hisi_hba->pdev->dev; - struct hisi_sas_dq *dq; + int queue = dq->id; u32 r, w; - int queue = dev_id % hisi_hba->queue_count; - dq = &hisi_hba->dq[queue]; w = dq->wr_point; r = hisi_sas_read32_relaxed(hisi_hba, DLVRY_Q_0_RD_PTR + (queue * 0x14)); @@ -924,16 +919,14 @@ static int get_free_slot_v1_hw(struct hisi_hba *hisi_hba, u32 dev_id, return -EAGAIN; } - *q = queue; - *s = w; return 0; } -static void start_delivery_v1_hw(struct hisi_hba *hisi_hba) +static void start_delivery_v1_hw(struct hisi_sas_dq *dq) { - int dlvry_queue = hisi_hba->slot_prep->dlvry_queue; - int dlvry_queue_slot = hisi_hba->slot_prep->dlvry_queue_slot; - struct hisi_sas_dq *dq = &hisi_hba->dq[dlvry_queue]; + struct hisi_hba *hisi_hba = dq->hisi_hba; + int dlvry_queue = dq->slot_prep->dlvry_queue; + int dlvry_queue_slot = dq->slot_prep->dlvry_queue_slot; dq->wr_point = ++dlvry_queue_slot % HISI_SAS_QUEUE_SLOTS; hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c index e241921bee10..2607aac00ac9 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c @@ -695,6 +695,9 @@ hisi_sas_device *alloc_dev_quirk_v2_hw(struct domain_device *device) if (sata_dev && (i & 1)) continue; if (hisi_hba->devices[i].dev_type == SAS_PHY_UNUSED) { + int queue = i % hisi_hba->queue_count; + struct hisi_sas_dq *dq = &hisi_hba->dq[queue]; + hisi_hba->devices[i].device_id = i; sas_dev = &hisi_hba->devices[i]; sas_dev->dev_status = HISI_SAS_DEV_NORMAL; @@ -702,6 +705,7 @@ hisi_sas_device *alloc_dev_quirk_v2_hw(struct domain_device *device) sas_dev->hisi_hba = hisi_hba; sas_dev->sas_device = device; sas_dev->sata_idx = sata_idx; + sas_dev->dq = dq; INIT_LIST_HEAD(&hisi_hba->devices[i].list); break; } @@ -1454,22 +1458,17 @@ static int get_wideport_bitmap_v2_hw(struct hisi_hba *hisi_hba, int port_id) return bitmap; } -/** - * This function allocates across all queues to load balance. - * Slots are allocated from queues in a round-robin fashion. - * +/* * The callpath to this function and upto writing the write * queue pointer should be safe from interruption. */ -static int get_free_slot_v2_hw(struct hisi_hba *hisi_hba, u32 dev_id, - int *q, int *s) +static int +get_free_slot_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_dq *dq) { struct device *dev = &hisi_hba->pdev->dev; - struct hisi_sas_dq *dq; + int queue = dq->id; u32 r, w; - int queue = dev_id % hisi_hba->queue_count; - dq = &hisi_hba->dq[queue]; w = dq->wr_point; r = hisi_sas_read32_relaxed(hisi_hba, DLVRY_Q_0_RD_PTR + (queue * 0x14)); @@ -1479,16 +1478,14 @@ static int get_free_slot_v2_hw(struct hisi_hba *hisi_hba, u32 dev_id, return -EAGAIN; } - *q = queue; - *s = w; return 0; } -static void start_delivery_v2_hw(struct hisi_hba *hisi_hba) +static void start_delivery_v2_hw(struct hisi_sas_dq *dq) { - int dlvry_queue = hisi_hba->slot_prep->dlvry_queue; - int dlvry_queue_slot = hisi_hba->slot_prep->dlvry_queue_slot; - struct hisi_sas_dq *dq = &hisi_hba->dq[dlvry_queue]; + struct hisi_hba *hisi_hba = dq->hisi_hba; + int dlvry_queue = dq->slot_prep->dlvry_queue; + int dlvry_queue_slot = dq->slot_prep->dlvry_queue_slot; dq->wr_point = ++dlvry_queue_slot % HISI_SAS_QUEUE_SLOTS; hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), @@ -2344,7 +2341,9 @@ slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot) spin_lock_irqsave(&task->task_state_lock, flags); task->task_state_flags |= SAS_TASK_STATE_DONE; spin_unlock_irqrestore(&task->task_state_lock, flags); + spin_lock_irqsave(&hisi_hba->lock, flags); hisi_sas_slot_task_free(hisi_hba, task, slot); + spin_unlock_irqrestore(&hisi_hba->lock, flags); sts = ts->stat; if (task->task_done) @@ -3162,13 +3161,14 @@ static void cq_tasklet_v2_hw(unsigned long val) struct hisi_sas_complete_v2_hdr *complete_queue; u32 rd_point = cq->rd_point, wr_point, dev_id; int queue = cq->id; + struct hisi_sas_dq *dq = &hisi_hba->dq[queue]; if (unlikely(hisi_hba->reject_stp_links_msk)) phys_try_accept_stp_links_v2_hw(hisi_hba); complete_queue = hisi_hba->complete_hdr[queue]; - spin_lock(&hisi_hba->lock); + spin_lock(&dq->lock); wr_point = hisi_sas_read32(hisi_hba, COMPL_Q_0_WR_PTR + (0x14 * queue)); @@ -3218,7 +3218,7 @@ static void cq_tasklet_v2_hw(unsigned long val) /* update rd_point */ cq->rd_point = rd_point; hisi_sas_write32(hisi_hba, COMPL_Q_0_RD_PTR + (0x14 * queue), rd_point); - spin_unlock(&hisi_hba->lock); + spin_unlock(&dq->lock); } static irqreturn_t cq_interrupt_v2_hw(int irq_no, void *p)