From patchwork Fri Jul 5 08:59:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Junxian Huang X-Patchwork-Id: 13724626 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C4BE7146A89; Fri, 5 Jul 2024 09:05:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720170303; cv=none; b=D//VtLg5SI48rNcHufhZlh7l4CEZtCExtoPjv2irQjyaD9DbsVH+g2KDldHjjme6uGrbLb5jEQR/u7ryc0xKpir3DdCbiTwUVL8V03BQnMfP3+sHaku11FZTWZDCkxIMu1T5h4FD2gFYyOnkxKle3QUXTolvKhZX8t5Aq8K61R0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720170303; c=relaxed/simple; bh=MGvhsbz9a2ednMbaDqHrI5g2/aX6kMnXAbX1XIlHBW0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=UK67JZQhQsRpgQzSo4ymx+C7MfTgAEg30o/eD3Axs87W7yzVA4CX+qsXEght0HMSFrQazCn0orscBFLxJmL/08arcxl3ZGCcFo8iflwcBGtRtUab5pusjOGPS69nigr8MfQBIjfMH7Kb2pzevyzW+ffNSwxFA+FUvCfFgObkZKA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com; spf=pass smtp.mailfrom=hisilicon.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=hisilicon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hisilicon.com Received: from mail.maildlp.com (unknown [172.19.163.48]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4WFndY3S9kznZ3L; Fri, 5 Jul 2024 17:04:33 +0800 (CST) Received: from kwepemf100018.china.huawei.com (unknown [7.202.181.17]) by mail.maildlp.com (Postfix) with ESMTPS id 46FCA180087; Fri, 5 Jul 2024 17:04:53 +0800 (CST) Received: from localhost.localdomain (10.90.30.45) by kwepemf100018.china.huawei.com (7.202.181.17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Fri, 5 Jul 2024 17:04:52 +0800 From: Junxian Huang To: , CC: , , , Subject: [PATCH for-rc 3/9] RDMA/hns: Fix soft lockup under heavy CEQE load Date: Fri, 5 Jul 2024 16:59:31 +0800 Message-ID: <20240705085937.1644229-4-huangjunxian6@hisilicon.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20240705085937.1644229-1-huangjunxian6@hisilicon.com> References: <20240705085937.1644229-1-huangjunxian6@hisilicon.com> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemf100018.china.huawei.com (7.202.181.17) CEQEs are handled in interrupt handler currently. This may cause the CPU core staying in interrupt context too long and lead to soft lockup under heavy load. Handle CEQEs in tasklet and set an upper limit for the number of CEQE handled by a single call of tasklet. Fixes: a5073d6054f7 ("RDMA/hns: Add eq support of hip08") Signed-off-by: Junxian Huang --- drivers/infiniband/hw/hns/hns_roce_device.h | 1 + drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 88 ++++++++++++--------- 2 files changed, 53 insertions(+), 36 deletions(-) diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h index 05005079258c..5a2445f357ab 100644 --- a/drivers/infiniband/hw/hns/hns_roce_device.h +++ b/drivers/infiniband/hw/hns/hns_roce_device.h @@ -717,6 +717,7 @@ struct hns_roce_eq { int shift; int event_type; int sub_type; + struct tasklet_struct tasklet; }; struct hns_roce_eq_table { diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c index ff135df1a761..f73de06a3ca5 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c @@ -6146,33 +6146,11 @@ static struct hns_roce_ceqe *next_ceqe_sw_v2(struct hns_roce_eq *eq) !!(eq->cons_index & eq->entries)) ? ceqe : NULL; } -static irqreturn_t hns_roce_v2_ceq_int(struct hns_roce_dev *hr_dev, - struct hns_roce_eq *eq) +static irqreturn_t hns_roce_v2_ceq_int(struct hns_roce_eq *eq) { - struct hns_roce_ceqe *ceqe = next_ceqe_sw_v2(eq); - irqreturn_t ceqe_found = IRQ_NONE; - u32 cqn; - - while (ceqe) { - /* Make sure we read CEQ entry after we have checked the - * ownership bit - */ - dma_rmb(); - - cqn = hr_reg_read(ceqe, CEQE_CQN); - - hns_roce_cq_completion(hr_dev, cqn); - - ++eq->cons_index; - ceqe_found = IRQ_HANDLED; - atomic64_inc(&hr_dev->dfx_cnt[HNS_ROCE_DFX_CEQE_CNT]); - - ceqe = next_ceqe_sw_v2(eq); - } + tasklet_schedule(&eq->tasklet); - update_eq_db(eq); - - return IRQ_RETVAL(ceqe_found); + return IRQ_HANDLED; } static irqreturn_t hns_roce_v2_msix_interrupt_eq(int irq, void *eq_ptr) @@ -6183,7 +6161,7 @@ static irqreturn_t hns_roce_v2_msix_interrupt_eq(int irq, void *eq_ptr) if (eq->type_flag == HNS_ROCE_CEQ) /* Completion event interrupt */ - int_work = hns_roce_v2_ceq_int(hr_dev, eq); + int_work = hns_roce_v2_ceq_int(eq); else /* Asynchronous event interrupt */ int_work = hns_roce_v2_aeq_int(hr_dev, eq); @@ -6551,6 +6529,34 @@ static int hns_roce_v2_create_eq(struct hns_roce_dev *hr_dev, return ret; } +static void hns_roce_ceq_task(struct tasklet_struct *task) +{ + struct hns_roce_eq *eq = from_tasklet(eq, task, tasklet); + struct hns_roce_ceqe *ceqe = next_ceqe_sw_v2(eq); + struct hns_roce_dev *hr_dev = eq->hr_dev; + int ceqe_num = 0; + u32 cqn; + + while (ceqe && ceqe_num < hr_dev->caps.ceqe_depth) { + /* Make sure we read CEQ entry after we have checked the + * ownership bit + */ + dma_rmb(); + + cqn = hr_reg_read(ceqe, CEQE_CQN); + + hns_roce_cq_completion(hr_dev, cqn); + + ++eq->cons_index; + ++ceqe_num; + atomic64_inc(&hr_dev->dfx_cnt[HNS_ROCE_DFX_CEQE_CNT]); + + ceqe = next_ceqe_sw_v2(eq); + } + + update_eq_db(eq); +} + static int __hns_roce_request_irq(struct hns_roce_dev *hr_dev, int irq_num, int comp_num, int aeq_num, int other_num) { @@ -6582,21 +6588,24 @@ static int __hns_roce_request_irq(struct hns_roce_dev *hr_dev, int irq_num, j - other_num - aeq_num); for (j = 0; j < irq_num; j++) { - if (j < other_num) + if (j < other_num) { ret = request_irq(hr_dev->irq[j], hns_roce_v2_msix_interrupt_abn, 0, hr_dev->irq_names[j], hr_dev); - - else if (j < (other_num + comp_num)) + } else if (j < (other_num + comp_num)) { + tasklet_setup(&eq_table->eq[j - other_num].tasklet, + hns_roce_ceq_task); ret = request_irq(eq_table->eq[j - other_num].irq, hns_roce_v2_msix_interrupt_eq, 0, hr_dev->irq_names[j + aeq_num], &eq_table->eq[j - other_num]); - else + } else { ret = request_irq(eq_table->eq[j - other_num].irq, hns_roce_v2_msix_interrupt_eq, 0, hr_dev->irq_names[j - comp_num], &eq_table->eq[j - other_num]); + } + if (ret) { dev_err(hr_dev->dev, "request irq error!\n"); goto err_request_failed; @@ -6606,12 +6615,16 @@ static int __hns_roce_request_irq(struct hns_roce_dev *hr_dev, int irq_num, return 0; err_request_failed: - for (j -= 1; j >= 0; j--) - if (j < other_num) + for (j -= 1; j >= 0; j--) { + if (j < other_num) { free_irq(hr_dev->irq[j], hr_dev); - else - free_irq(eq_table->eq[j - other_num].irq, - &eq_table->eq[j - other_num]); + continue; + } + free_irq(eq_table->eq[j - other_num].irq, + &eq_table->eq[j - other_num]); + if (j < other_num + comp_num) + tasklet_kill(&eq_table->eq[j - other_num].tasklet); + } err_kzalloc_failed: for (i -= 1; i >= 0; i--) @@ -6632,8 +6645,11 @@ static void __hns_roce_free_irq(struct hns_roce_dev *hr_dev) for (i = 0; i < hr_dev->caps.num_other_vectors; i++) free_irq(hr_dev->irq[i], hr_dev); - for (i = 0; i < eq_num; i++) + for (i = 0; i < eq_num; i++) { free_irq(hr_dev->eq_table.eq[i].irq, &hr_dev->eq_table.eq[i]); + if (i < hr_dev->caps.num_comp_vectors) + tasklet_kill(&hr_dev->eq_table.eq[i].tasklet); + } for (i = 0; i < irq_num; i++) kfree(hr_dev->irq_names[i]);