From patchwork Mon Dec 10 09:12:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Sheng X-Patchwork-Id: 10720525 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7EF72112E for ; Mon, 10 Dec 2018 02:45:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6DA2E29C9C for ; Mon, 10 Dec 2018 02:45:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 60D0629FB3; Mon, 10 Dec 2018 02:45:19 +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=-6.0 required=2.0 tests=BAYES_00,DATE_IN_FUTURE_06_12, 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 9248229C9C for ; 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Mon, 10 Dec 2018 02:44:41 +0000 Received: from AUSMBX3.microsemi.net (10.201.34.33) by AUSMBX1.microsemi.net (10.201.34.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1531.3; Sun, 9 Dec 2018 20:14:34 -0600 Received: from server1.microsemi.net (10.188.116.209) by ausmbx3.microsemi.net (10.201.34.33) with Microsoft SMTP Server id 15.1.1531.3 via Frontend Transport; Sun, 9 Dec 2018 20:14:32 -0600 From: Wesley Sheng To: , , , , CC: , Subject: [PATCH 5/5] switchtec: MRPC DMA mode implementation Date: Mon, 10 Dec 2018 17:12:24 +0800 Message-ID: <1544433144-7563-6-git-send-email-wesley.sheng@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1544433144-7563-1-git-send-email-wesley.sheng@microchip.com> References: <1544433144-7563-1-git-send-email-wesley.sheng@microchip.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-Matching-Connectors: 131888834812552082;(5a93feec-e11d-4f7b-166a-08d09f1f276b);() X-Forefront-Antispam-Report: CIP:208.19.99.221;IPV:NLI;CTRY:US;EFV:NLI;SFV:NSPM;SFS:(10009020)(396003)(39860400002)(376002)(136003)(346002)(2980300002)(189003)(199004)(486006)(44832011)(86362001)(53936002)(106466001)(8936002)(8676002)(126002)(4326008)(316002)(336012)(81166006)(476003)(217873002)(81156014)(2201001)(2906002)(97736004)(68736007)(5660300001)(16586007)(105596002)(2616005)(36756003)(53416004)(69596002)(446003)(11346002)(50226002)(6666004)(356004)(14444005)(110136005)(107886003)(6346003)(305945005)(50466002)(450100002)(498600001)(48376002)(54906003)(77096007)(26005)(47776003)(76176011)(51416003);DIR:OUT;SFP:1101;SCL:1;SRVR:BN6PR19MB1316;H:AUSMBX1.microsemi.net;FPR:;SPF:SoftFail;LANG:en;PTR:InfoDomainNonexistent;MX:1;A:1; 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This results in high latency responses from the Memory Read TLP and potential Completion Timeout (CTO). MRPC DMA mode implementation includes: Macro definitions for registers and data structures corresponding to MRPC DMA mode. Add module parameter use_dma_mrpc to select between MRPC DMA mode and MRPC normal mode. Add MRPC mode functionality to: * Retrieve MRPC DMA mode version * Allocate DMA buffer, ISR registration, and enable DMA function during initialization * Check MRPC execution status and collect execution results from DMA buffer * Release DMA buffer and disable DMA function when unloading module MRPC DMA mode is a new feature of firmware and the driver will fall back to MRPC normal mode if there is no support in the legacy firmware. Include so that readq/writeq is replaced by two readl/writel on systems that do not support it. Signed-off-by: Wesley Sheng Reviewed-by: Logan Gunthorpe --- drivers/pci/switch/switchtec.c | 108 +++++++++++++++++++++++++++++++++++++---- include/linux/switchtec.h | 16 ++++++ 2 files changed, 114 insertions(+), 10 deletions(-) diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c index 0b8862b..6b726cb 100644 --- a/drivers/pci/switch/switchtec.c +++ b/drivers/pci/switch/switchtec.c @@ -13,7 +13,7 @@ #include #include #include - +#include #include MODULE_DESCRIPTION("Microsemi Switchtec(tm) PCIe Management Driver"); @@ -25,6 +25,11 @@ static int max_devices = 16; module_param(max_devices, int, 0644); MODULE_PARM_DESC(max_devices, "max number of switchtec device instances"); +static bool use_dma_mrpc = 1; +module_param(use_dma_mrpc, bool, 0644); +MODULE_PARM_DESC(use_dma_mrpc, + "Enable the use of the DMA MRPC feature"); + static dev_t switchtec_devt; static DEFINE_IDA(switchtec_minor_ida); @@ -141,6 +146,11 @@ static void mrpc_cmd_submit(struct switchtec_dev *stdev) stuser = list_entry(stdev->mrpc_queue.next, struct switchtec_user, list); + if (stdev->dma_mrpc) { + stdev->dma_mrpc->status = SWITCHTEC_MRPC_STATUS_INPROGRESS; + memset(stdev->dma_mrpc->data, 0xFF, SWITCHTEC_MRPC_PAYLOAD_SIZE); + } + stuser_set_state(stuser, MRPC_RUNNING); stdev->mrpc_busy = 1; memcpy_toio(&stdev->mmio_mrpc->input_data, @@ -180,7 +190,11 @@ static void mrpc_complete_cmd(struct switchtec_dev *stdev) stuser = list_entry(stdev->mrpc_queue.next, struct switchtec_user, list); - stuser->status = ioread32(&stdev->mmio_mrpc->status); + if (stdev->dma_mrpc) + stuser->status = stdev->dma_mrpc->status; + else + stuser->status = ioread32(&stdev->mmio_mrpc->status); + if (stuser->status == SWITCHTEC_MRPC_STATUS_INPROGRESS) return; @@ -190,13 +204,19 @@ static void mrpc_complete_cmd(struct switchtec_dev *stdev) if (stuser->status != SWITCHTEC_MRPC_STATUS_DONE) goto out; - stuser->return_code = ioread32(&stdev->mmio_mrpc->ret_value); + if (stdev->dma_mrpc) + stuser->return_code = stdev->dma_mrpc->rtn_code; + else + stuser->return_code = ioread32(&stdev->mmio_mrpc->ret_value); if (stuser->return_code != 0) goto out; - memcpy_fromio(stuser->data, &stdev->mmio_mrpc->output_data, - stuser->read_len); - + if (stdev->dma_mrpc) + memcpy(stuser->data, &stdev->dma_mrpc->data, + stuser->read_len); + else + memcpy_fromio(stuser->data, &stdev->mmio_mrpc->output_data, + stuser->read_len); out: complete_all(&stuser->comp); list_del_init(&stuser->list); @@ -231,7 +251,10 @@ static void mrpc_timeout_work(struct work_struct *work) mutex_lock(&stdev->mrpc_mutex); - status = ioread32(&stdev->mmio_mrpc->status); + if (stdev->dma_mrpc) + status = stdev->dma_mrpc->status; + else + status = ioread32(&stdev->mmio_mrpc->status); if (status == SWITCHTEC_MRPC_STATUS_INPROGRESS) { schedule_delayed_work(&stdev->mrpc_timeout, msecs_to_jiffies(500)); @@ -239,7 +262,6 @@ static void mrpc_timeout_work(struct work_struct *work) } mrpc_complete_cmd(stdev); - out: mutex_unlock(&stdev->mrpc_mutex); } @@ -1030,10 +1052,24 @@ static void enable_link_state_events(struct switchtec_dev *stdev) } } +static void enable_dma_mrpc(struct switchtec_dev *stdev) +{ + writeq(stdev->dma_mrpc_dma_addr, &stdev->mmio_mrpc->dma_addr); + flush_wc_buf(stdev); + iowrite32(SWITCHTEC_DMA_MRPC_EN, &stdev->mmio_mrpc->dma_en); +} + static void stdev_release(struct device *dev) { struct switchtec_dev *stdev = to_stdev(dev); + if (stdev->dma_mrpc) { + iowrite32(0, &stdev->mmio_mrpc->dma_en); + flush_wc_buf(stdev); + writeq(0, &stdev->mmio_mrpc->dma_addr); + dma_free_coherent(&stdev->pdev->dev, sizeof(*stdev->dma_mrpc), + stdev->dma_mrpc, stdev->dma_mrpc_dma_addr); + } kfree(stdev); } @@ -1189,10 +1225,27 @@ static irqreturn_t switchtec_event_isr(int irq, void *dev) return ret; } + +static irqreturn_t switchtec_dma_mrpc_isr(int irq, void *dev) +{ + struct switchtec_dev *stdev = dev; + irqreturn_t ret = IRQ_NONE; + + iowrite32(SWITCHTEC_EVENT_CLEAR | + SWITCHTEC_EVENT_EN_IRQ, + &stdev->mmio_part_cfg->mrpc_comp_hdr); + schedule_work(&stdev->mrpc_work); + + ret = IRQ_HANDLED; + return ret; +} + static int switchtec_init_isr(struct switchtec_dev *stdev) { int nvecs; int event_irq; + int dma_mrpc_irq; + int rc; nvecs = pci_alloc_irq_vectors(stdev->pdev, 1, 4, PCI_IRQ_MSIX | PCI_IRQ_MSI); @@ -1207,9 +1260,29 @@ static int switchtec_init_isr(struct switchtec_dev *stdev) if (event_irq < 0) return event_irq; - return devm_request_irq(&stdev->pdev->dev, event_irq, + rc = devm_request_irq(&stdev->pdev->dev, event_irq, switchtec_event_isr, 0, KBUILD_MODNAME, stdev); + + if (rc) + return rc; + + if (!stdev->dma_mrpc) + return rc; + + dma_mrpc_irq = ioread32(&stdev->mmio_mrpc->dma_vector); + if (dma_mrpc_irq < 0 || dma_mrpc_irq >= nvecs) + return -EFAULT; + + dma_mrpc_irq = pci_irq_vector(stdev->pdev, dma_mrpc_irq); + if (dma_mrpc_irq < 0) + return dma_mrpc_irq; + + rc = devm_request_irq(&stdev->pdev->dev, dma_mrpc_irq, + switchtec_dma_mrpc_isr, 0, + KBUILD_MODNAME, stdev); + + return rc; } static void init_pff(struct switchtec_dev *stdev) @@ -1294,6 +1367,19 @@ static int switchtec_init_pci(struct switchtec_dev *stdev, pci_set_drvdata(pdev, stdev); + if (!use_dma_mrpc) + return 0; + + if (!(ioread32(&stdev->mmio_mrpc->dma_ver) ? true : false)) + return 0; + + stdev->dma_mrpc = dma_zalloc_coherent(&stdev->pdev->dev, + sizeof(*stdev->dma_mrpc), + &stdev->dma_mrpc_dma_addr, + GFP_KERNEL); + if (stdev->dma_mrpc == NULL) + return -ENOMEM; + return 0; } @@ -1325,6 +1411,9 @@ static int switchtec_pci_probe(struct pci_dev *pdev, &stdev->mmio_part_cfg->mrpc_comp_hdr); enable_link_state_events(stdev); + if (stdev->dma_mrpc) + enable_dma_mrpc(stdev); + rc = cdev_device_add(&stdev->cdev, &stdev->dev); if (rc) goto err_devadd; @@ -1350,7 +1439,6 @@ static void switchtec_pci_remove(struct pci_dev *pdev) cdev_device_del(&stdev->cdev, &stdev->dev); ida_simple_remove(&switchtec_minor_ida, MINOR(stdev->dev.devt)); dev_info(&stdev->dev, "unregistered.\n"); - stdev_kill(stdev); put_device(&stdev->dev); } diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h index ab400af..eee0412 100644 --- a/include/linux/switchtec.h +++ b/include/linux/switchtec.h @@ -29,6 +29,7 @@ #define SWITCHTEC_EVENT_EN_IRQ BIT(3) #define SWITCHTEC_EVENT_FATAL BIT(4) +#define SWITCHTEC_DMA_MRPC_EN BIT(0) enum { SWITCHTEC_GAS_MRPC_OFFSET = 0x0000, SWITCHTEC_GAS_TOP_CFG_OFFSET = 0x1000, @@ -46,6 +47,10 @@ struct mrpc_regs { u32 cmd; u32 status; u32 ret_value; + u32 dma_en; + u64 dma_addr; + u32 dma_vector; + u32 dma_ver; } __packed; enum mrpc_status { @@ -342,6 +347,14 @@ struct pff_csr_regs { struct switchtec_ntb; +struct dma_mrpc_output { + u32 status; + u32 cmd_id; + u32 rtn_code; + u32 output_size; + u8 data[SWITCHTEC_MRPC_PAYLOAD_SIZE]; +}; + struct switchtec_dev { struct pci_dev *pdev; struct device dev; @@ -381,6 +394,9 @@ struct switchtec_dev { u8 link_event_count[SWITCHTEC_MAX_PFF_CSR]; struct switchtec_ntb *sndev; + + struct dma_mrpc_output *dma_mrpc; + dma_addr_t dma_mrpc_dma_addr; }; static inline struct switchtec_dev *to_stdev(struct device *dev)