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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,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 5307AC18E01 for ; Tue, 20 Nov 2018 14:58:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1FF2620870 for ; Tue, 20 Nov 2018 14:58:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1FF2620870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727031AbeKUB2E (ORCPT ); Tue, 20 Nov 2018 20:28:04 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:15567 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725949AbeKUB2E (ORCPT ); Tue, 20 Nov 2018 20:28:04 -0500 Received: from DGGEMS401-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 5A7E67EB201A4; Tue, 20 Nov 2018 22:58:21 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by DGGEMS401-HUB.china.huawei.com (10.3.19.201) with Microsoft SMTP Server id 14.3.408.0; Tue, 20 Nov 2018 22:58:12 +0800 From: John Garry To: , CC: , , , Xiang Chen , "John Garry" Subject: [PATCH 2/4] scsi: hisi_sas: Relocate some code to reduce complexity Date: Tue, 20 Nov 2018 22:59:02 +0800 Message-ID: <1542725944-244183-3-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1542725944-244183-1-git-send-email-john.garry@huawei.com> References: <1542725944-244183-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiang Chen Relocate the codes related to dma_map/unmap in hisi_sas_task_prep() to reduce complexity, with a view to add DIF/DIX support. Signed-off-by: Xiang Chen Signed-off-by: John Garry --- drivers/scsi/hisi_sas/hisi_sas_main.c | 146 +++++++++++++++++++++------------- 1 file changed, 90 insertions(+), 56 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 65dc749..d13a662 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -296,6 +296,90 @@ static void hisi_sas_task_prep_abort(struct hisi_hba *hisi_hba, device_id, abort_flag, tag_to_abort); } +static void hisi_sas_dma_unmap(struct hisi_hba *hisi_hba, + struct sas_task *task, int n_elem, + int n_elem_req, int n_elem_resp) +{ + struct device *dev = hisi_hba->dev; + + if (!sas_protocol_ata(task->task_proto)) { + if (task->num_scatter) { + if (n_elem) + dma_unmap_sg(dev, task->scatter, + task->num_scatter, + task->data_dir); + } else if (task->task_proto & SAS_PROTOCOL_SMP) { + if (n_elem_req) + dma_unmap_sg(dev, &task->smp_task.smp_req, + 1, DMA_TO_DEVICE); + if (n_elem_resp) + dma_unmap_sg(dev, &task->smp_task.smp_resp, + 1, DMA_FROM_DEVICE); + } + } +} + +static int hisi_sas_dma_map(struct hisi_hba *hisi_hba, + struct sas_task *task, int *n_elem, + int *n_elem_req, int *n_elem_resp) +{ + struct device *dev = hisi_hba->dev; + int rc; + + if (sas_protocol_ata(task->task_proto)) { + *n_elem = task->num_scatter; + } else { + unsigned int req_len, resp_len; + + if (task->num_scatter) { + *n_elem = dma_map_sg(dev, task->scatter, + task->num_scatter, task->data_dir); + if (!*n_elem) { + rc = -ENOMEM; + goto prep_out; + } + } else if (task->task_proto & SAS_PROTOCOL_SMP) { + *n_elem_req = dma_map_sg(dev, &task->smp_task.smp_req, + 1, DMA_TO_DEVICE); + if (!*n_elem_req) { + rc = -ENOMEM; + goto prep_out; + } + req_len = sg_dma_len(&task->smp_task.smp_req); + if (req_len & 0x3) { + rc = -EINVAL; + goto err_out_dma_unmap; + } + *n_elem_resp = dma_map_sg(dev, &task->smp_task.smp_resp, + 1, DMA_FROM_DEVICE); + if (!*n_elem_resp) { + rc = -ENOMEM; + goto err_out_dma_unmap; + } + resp_len = sg_dma_len(&task->smp_task.smp_resp); + if (resp_len & 0x3) { + rc = -EINVAL; + goto err_out_dma_unmap; + } + } + } + + if (*n_elem > HISI_SAS_SGE_PAGE_CNT) { + dev_err(dev, "task prep: n_elem(%d) > HISI_SAS_SGE_PAGE_CNT", + *n_elem); + rc = -EINVAL; + goto err_out_dma_unmap; + } + return 0; + +err_out_dma_unmap: + /* It would be better to call dma_unmap_sg() here, but it's messy */ + hisi_sas_dma_unmap(hisi_hba, task, *n_elem, + *n_elem_req, *n_elem_resp); +prep_out: + return rc; +} + static int hisi_sas_task_prep(struct sas_task *task, struct hisi_sas_dq **dq_pointer, bool is_tmf, struct hisi_sas_tmf_task *tmf, @@ -338,49 +422,10 @@ static int hisi_sas_task_prep(struct sas_task *task, return -ECOMM; } - if (!sas_protocol_ata(task->task_proto)) { - unsigned int req_len, resp_len; - - if (task->num_scatter) { - n_elem = dma_map_sg(dev, task->scatter, - task->num_scatter, task->data_dir); - if (!n_elem) { - rc = -ENOMEM; - goto prep_out; - } - } else if (task->task_proto & SAS_PROTOCOL_SMP) { - n_elem_req = dma_map_sg(dev, &task->smp_task.smp_req, - 1, DMA_TO_DEVICE); - if (!n_elem_req) { - rc = -ENOMEM; - goto prep_out; - } - req_len = sg_dma_len(&task->smp_task.smp_req); - if (req_len & 0x3) { - rc = -EINVAL; - goto err_out_dma_unmap; - } - n_elem_resp = dma_map_sg(dev, &task->smp_task.smp_resp, - 1, DMA_FROM_DEVICE); - if (!n_elem_resp) { - rc = -ENOMEM; - goto err_out_dma_unmap; - } - resp_len = sg_dma_len(&task->smp_task.smp_resp); - if (resp_len & 0x3) { - rc = -EINVAL; - goto err_out_dma_unmap; - } - } - } else - n_elem = task->num_scatter; - - if (n_elem > HISI_SAS_SGE_PAGE_CNT) { - dev_err(dev, "task prep: n_elem(%d) > HISI_SAS_SGE_PAGE_CNT", - n_elem); - rc = -EINVAL; - goto err_out_dma_unmap; - } + rc = hisi_sas_dma_map(hisi_hba, task, &n_elem, + &n_elem_req, &n_elem_resp); + if (rc < 0) + goto prep_out; if (hisi_hba->hw->slot_index_alloc) rc = hisi_hba->hw->slot_index_alloc(hisi_hba, device); @@ -465,19 +510,8 @@ static int hisi_sas_task_prep(struct sas_task *task, err_out_tag: hisi_sas_slot_index_free(hisi_hba, slot_idx); err_out_dma_unmap: - if (!sas_protocol_ata(task->task_proto)) { - if (task->num_scatter) { - dma_unmap_sg(dev, task->scatter, task->num_scatter, - task->data_dir); - } else if (task->task_proto & SAS_PROTOCOL_SMP) { - if (n_elem_req) - dma_unmap_sg(dev, &task->smp_task.smp_req, - 1, DMA_TO_DEVICE); - if (n_elem_resp) - dma_unmap_sg(dev, &task->smp_task.smp_resp, - 1, DMA_FROM_DEVICE); - } - } + hisi_sas_dma_unmap(hisi_hba, task, n_elem, + n_elem_req, n_elem_resp); prep_out: dev_err(dev, "task prep: failed[%d]!\n", rc); return rc; -- 1.9.1