From patchwork Wed May 9 15:10:48 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 10389731 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A463460236 for ; Wed, 9 May 2018 15:15:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6EBB3290E0 for ; Wed, 9 May 2018 15:15:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6C4D02915A; Wed, 9 May 2018 15:15:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 764B729134 for ; Wed, 9 May 2018 15:12:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964870AbeEIPMQ (ORCPT ); Wed, 9 May 2018 11:12:16 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:47096 "EHLO huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S964817AbeEIPMN (ORCPT ); Wed, 9 May 2018 11:12:13 -0400 Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 4D02A34D42A09; Wed, 9 May 2018 23:12:08 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by DGGEMS410-HUB.china.huawei.com (10.3.19.210) with Microsoft SMTP Server id 14.3.361.1; Wed, 9 May 2018 23:12:00 +0800 From: John Garry To: , CC: , , , Xiang Chen , "John Garry" Subject: [PATCH 4/6] scsi: hisi_sas: Don't lock DQ for complete task sending Date: Wed, 9 May 2018 23:10:48 +0800 Message-ID: <1525878650-213087-5-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1525878650-213087-1-git-send-email-john.garry@huawei.com> References: <1525878650-213087-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Xiang Chen Currently we lock the DQ to protect whole delivery process. So this stops us building slots for the same queue in parallel, and can affect performance. To optimise it, only lock the DQ during special periods, specifically when allocating a slot from the DQ and when delivering a slot to the HW. This approach is now safe, thanks to the previous patches to ensure that we always deliver a slot to the HW once allocated. Signed-off-by: Xiang Chen Signed-off-by: John Garry --- drivers/scsi/hisi_sas/hisi_sas.h | 4 ++- drivers/scsi/hisi_sas/hisi_sas_main.c | 49 ++++++++++++++++++++-------------- drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 27 ++++++++++++++----- drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 29 +++++++++++++++----- drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 28 ++++++++++++++----- 5 files changed, 96 insertions(+), 41 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h index 3a1caa04..52fc709 100644 --- a/drivers/scsi/hisi_sas/hisi_sas.h +++ b/drivers/scsi/hisi_sas/hisi_sas.h @@ -161,7 +161,7 @@ struct hisi_sas_cq { struct hisi_sas_dq { struct hisi_hba *hisi_hba; - struct hisi_sas_slot *slot_prep; + struct list_head list; spinlock_t lock; int wr_point; int id; @@ -181,6 +181,7 @@ struct hisi_sas_device { struct hisi_sas_slot { struct list_head entry; + struct list_head delivery; struct sas_task *task; struct hisi_sas_port *port; u64 n_elem; @@ -190,6 +191,7 @@ struct hisi_sas_slot { int cmplt_queue_slot; int idx; int abort; + int ready; void *buf; dma_addr_t buf_dma; void *cmd_hdr; diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 58cbe1f..bf374a7 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -307,9 +307,9 @@ 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_sas_dq - *dq, 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; @@ -321,7 +321,8 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_sas_dq struct device *dev = hisi_hba->dev; int dlvry_queue_slot, dlvry_queue, rc, slot_idx; int n_elem = 0, n_elem_req = 0, n_elem_resp = 0; - unsigned long flags; + unsigned long flags, flags_dq; + int wr_q_index; if (!sas_port) { struct task_status_struct *ts = &task->task_status; @@ -422,12 +423,18 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_sas_dq goto err_out_tag; } - rc = hisi_hba->hw->get_free_slot(hisi_hba, dq); - if (rc) + spin_lock_irqsave(&dq->lock, flags_dq); + wr_q_index = hisi_hba->hw->get_free_slot(hisi_hba, dq); + if (wr_q_index < 0) { + spin_unlock_irqrestore(&dq->lock, flags_dq); goto err_out_buf; + } + + list_add_tail(&slot->delivery, &dq->list); + spin_unlock_irqrestore(&dq->lock, flags_dq); dlvry_queue = dq->id; - dlvry_queue_slot = dq->wr_point; + dlvry_queue_slot = wr_q_index; slot->idx = slot_idx; slot->n_elem = n_elem; @@ -471,8 +478,8 @@ static int hisi_sas_task_prep(struct sas_task *task, struct hisi_sas_dq task->task_state_flags |= SAS_TASK_AT_INITIATOR; spin_unlock_irqrestore(&task->task_state_lock, flags); - dq->slot_prep = slot; ++(*pass); + slot->ready = 1; return 0; @@ -518,11 +525,11 @@ static int hisi_sas_task_exec(struct sas_task *task, gfp_t gfp_flags, return -EINVAL; /* protect task_prep and start_delivery sequence */ - 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); + spin_lock_irqsave(&dq->lock, flags); if (likely(pass)) hisi_hba->hw->start_delivery(dq); spin_unlock_irqrestore(&dq->lock, flags); @@ -1503,7 +1510,8 @@ static int hisi_sas_query_task(struct sas_task *task) 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, flags_dq; + unsigned long flags, flags_dq = 0; + int wr_q_index; if (unlikely(test_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags))) return -EINVAL; @@ -1531,16 +1539,18 @@ static int hisi_sas_query_task(struct sas_task *task) rc = -ENOMEM; goto err_out_tag; } + spin_lock_irqsave(&dq->lock, flags_dq); - rc = hisi_hba->hw->get_free_slot(hisi_hba, dq); - if (rc) { - rc = -ENOMEM; + wr_q_index = hisi_hba->hw->get_free_slot(hisi_hba, dq); + if (wr_q_index < 0) { spin_unlock_irqrestore(&dq->lock, flags_dq); goto err_out_buf; } + list_add_tail(&slot->delivery, &dq->list); + spin_unlock_irqrestore(&dq->lock, flags_dq); dlvry_queue = dq->id; - dlvry_queue_slot = dq->wr_point; + dlvry_queue_slot = wr_q_index; slot->idx = slot_idx; slot->n_elem = n_elem; @@ -1560,18 +1570,16 @@ static int hisi_sas_query_task(struct sas_task *task) hisi_sas_task_prep_abort(hisi_hba, slot, device_id, abort_flag, task_tag); - spin_lock_irqsave(&hisi_hba->lock, flags); - list_add_tail(&slot->entry, &sas_dev->list); - spin_unlock_irqrestore(&hisi_hba->lock, flags); spin_lock_irqsave(&task->task_state_lock, flags); task->task_state_flags |= SAS_TASK_AT_INITIATOR; spin_unlock_irqrestore(&task->task_state_lock, flags); - dq->slot_prep = slot; - + slot->ready = 1; /* send abort command to the chip */ + spin_lock_irqsave(&dq->lock, flags); + list_add_tail(&slot->entry, &sas_dev->list); hisi_hba->hw->start_delivery(dq); - spin_unlock_irqrestore(&dq->lock, flags_dq); + spin_unlock_irqrestore(&dq->lock, flags); return 0; @@ -1856,6 +1864,7 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost) /* Delivery queue structure */ spin_lock_init(&dq->lock); + INIT_LIST_HEAD(&dq->list); dq->id = i; dq->hisi_hba = hisi_hba; diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c index 7781a01..abe175f 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c @@ -921,18 +921,33 @@ static int get_wideport_bitmap_v1_hw(struct hisi_hba *hisi_hba, int port_id) return -EAGAIN; } - return 0; + dq->wr_point = (dq->wr_point + 1) % HISI_SAS_QUEUE_SLOTS; + + return w; } +/* DQ lock must be taken here */ static void start_delivery_v1_hw(struct hisi_sas_dq *dq) { 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; + struct hisi_sas_slot *s, *s1; + struct list_head *dq_list; + int dlvry_queue = dq->id; + int wp, count = 0; + + dq_list = &dq->list; + list_for_each_entry_safe(s, s1, &dq->list, delivery) { + if (!s->ready) + break; + count++; + wp = (s->dlvry_queue_slot + 1) % HISI_SAS_QUEUE_SLOTS; + list_del(&s->delivery); + } + + if (!count) + return; - dq->wr_point = ++dlvry_queue_slot % HISI_SAS_QUEUE_SLOTS; - hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), - dq->wr_point); + hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), wp); } static void prep_prd_sge_v1_hw(struct hisi_hba *hisi_hba, diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c index 9f77fd8..911bb76 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c @@ -1663,23 +1663,38 @@ static int get_wideport_bitmap_v2_hw(struct hisi_hba *hisi_hba, int port_id) r = hisi_sas_read32_relaxed(hisi_hba, DLVRY_Q_0_RD_PTR + (queue * 0x14)); if (r == (w+1) % HISI_SAS_QUEUE_SLOTS) { - dev_warn(dev, "full queue=%d r=%d w=%d\n\n", + dev_warn(dev, "full queue=%d r=%d w=%d\n", queue, r, w); return -EAGAIN; } - return 0; + dq->wr_point = (dq->wr_point + 1) % HISI_SAS_QUEUE_SLOTS; + + return w; } +/* DQ lock must be taken here */ static void start_delivery_v2_hw(struct hisi_sas_dq *dq) { 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; + struct hisi_sas_slot *s, *s1; + struct list_head *dq_list; + int dlvry_queue = dq->id; + int wp, count = 0; + + dq_list = &dq->list; + list_for_each_entry_safe(s, s1, &dq->list, delivery) { + if (!s->ready) + break; + count++; + wp = (s->dlvry_queue_slot + 1) % HISI_SAS_QUEUE_SLOTS; + list_del(&s->delivery); + } + + if (!count) + return; - dq->wr_point = ++dlvry_queue_slot % HISI_SAS_QUEUE_SLOTS; - hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), - dq->wr_point); + hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), wp); } static void prep_prd_sge_v2_hw(struct hisi_hba *hisi_hba, diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c index 8cd1374..56f1046 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c @@ -840,23 +840,37 @@ static int get_wideport_bitmap_v3_hw(struct hisi_hba *hisi_hba, int port_id) r = hisi_sas_read32_relaxed(hisi_hba, DLVRY_Q_0_RD_PTR + (queue * 0x14)); if (r == (w+1) % HISI_SAS_QUEUE_SLOTS) { - dev_warn(dev, "full queue=%d r=%d w=%d\n\n", + dev_warn(dev, "full queue=%d r=%d w=%d\n", queue, r, w); return -EAGAIN; } - return 0; + dq->wr_point = (dq->wr_point + 1) % HISI_SAS_QUEUE_SLOTS; + + return w; } static void start_delivery_v3_hw(struct hisi_sas_dq *dq) { 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; + struct hisi_sas_slot *s, *s1; + struct list_head *dq_list; + int dlvry_queue = dq->id; + int wp, count = 0; + + dq_list = &dq->list; + list_for_each_entry_safe(s, s1, &dq->list, delivery) { + if (!s->ready) + break; + count++; + wp = (s->dlvry_queue_slot + 1) % HISI_SAS_QUEUE_SLOTS; + list_del(&s->delivery); + } + + if (!count) + return; - dq->wr_point = ++dlvry_queue_slot % HISI_SAS_QUEUE_SLOTS; - hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), - dq->wr_point); + hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14), wp); } static void prep_prd_sge_v3_hw(struct hisi_hba *hisi_hba,