From patchwork Tue Jan 30 18:25:35 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 10192187 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.web.codeaurora.org (Postfix) with ESMTP id E356A6020C for ; Tue, 30 Jan 2018 18:25:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D18D020243 for ; Tue, 30 Jan 2018 18:25:43 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C66F421327; Tue, 30 Jan 2018 18:25:43 +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=-6.9 required=2.0 tests=BAYES_00,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 0C10E20243 for ; Tue, 30 Jan 2018 18:25:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752346AbeA3SZl (ORCPT ); Tue, 30 Jan 2018 13:25:41 -0500 Received: from mail.kernel.org ([198.145.29.99]:47112 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752299AbeA3SZi (ORCPT ); Tue, 30 Jan 2018 13:25:38 -0500 Received: from localhost (unknown [69.71.4.159]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A437E20740; Tue, 30 Jan 2018 18:25:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A437E20740 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=helgaas@kernel.org Subject: [PATCH v2 02/14] PCI/DPC: Add local variable for DPC capability offset From: Bjorn Helgaas To: Keith Busch Cc: Sinan Kaya , linux-pci@vger.kernel.org, Dongdong Liu Date: Tue, 30 Jan 2018 12:25:35 -0600 Message-ID: <20180130182535.106875.5954.stgit@bhelgaas-glaptop.roam.corp.google.com> In-Reply-To: <20180130182235.106875.70588.stgit@bhelgaas-glaptop.roam.corp.google.com> References: <20180130182235.106875.70588.stgit@bhelgaas-glaptop.roam.corp.google.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Bjorn Helgaas Add a local variable for DPC capability offset and replace repeated use of "dpc->cap_pos" with simply "cap". No functional change intended. Signed-off-by: Bjorn Helgaas Reviewed-by: Keith Busch --- drivers/pci/pcie/pcie-dpc.c | 65 +++++++++++++++++++------------------------ 1 file changed, 29 insertions(+), 36 deletions(-) diff --git a/drivers/pci/pcie/pcie-dpc.c b/drivers/pci/pcie/pcie-dpc.c index 48e1e3f8dd69..52702f7b911a 100644 --- a/drivers/pci/pcie/pcie-dpc.c +++ b/drivers/pci/pcie/pcie-dpc.c @@ -41,7 +41,7 @@ struct dpc_rp_pio_regs { struct dpc_dev { struct pcie_device *dev; struct work_struct work; - int cap_pos; + u16 cap_pos; bool rp; u32 rp_pio_status; }; @@ -73,13 +73,13 @@ static int dpc_wait_rp_inactive(struct dpc_dev *dpc) unsigned long timeout = jiffies + HZ; struct pci_dev *pdev = dpc->dev->port; struct device *dev = &dpc->dev->device; - u16 status; + u16 cap = dpc->cap_pos, status; - pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status); + pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); while (status & PCI_EXP_DPC_RP_BUSY && !time_after(jiffies, timeout)) { msleep(10); - pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status); + pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); } if (status & PCI_EXP_DPC_RP_BUSY) { dev_warn(dev, "DPC root port still busy\n"); @@ -110,7 +110,7 @@ static void dpc_work(struct work_struct *work) struct dpc_dev *dpc = container_of(work, struct dpc_dev, work); struct pci_dev *dev, *temp, *pdev = dpc->dev->port; struct pci_bus *parent = pdev->subordinate; - u16 ctl; + u16 cap = dpc->cap_pos, ctl; pci_lock_rescan_remove(); list_for_each_entry_safe_reverse(dev, temp, &parent->devices, @@ -129,17 +129,16 @@ static void dpc_work(struct work_struct *work) if (dpc->rp && dpc_wait_rp_inactive(dpc)) return; if (dpc->rp && dpc->rp_pio_status) { - pci_write_config_dword(pdev, - dpc->cap_pos + PCI_EXP_DPC_RP_PIO_STATUS, - dpc->rp_pio_status); + pci_write_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS, + dpc->rp_pio_status); dpc->rp_pio_status = 0; } - pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, + pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS, PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT); - pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl); - pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, + pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl); + pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL, ctl | PCI_EXP_DPC_CTL_INT_EN); } @@ -189,23 +188,22 @@ static void dpc_rp_pio_get_info(struct dpc_dev *dpc, struct pci_dev *pdev = dpc->dev->port; struct device *dev = &dpc->dev->device; int i; - u16 cap; - u16 status; + u16 cap = dpc->cap_pos, status; - pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_STATUS, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS, &rp_pio->status); - pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_MASK, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_MASK, &rp_pio->mask); - pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_SEVERITY, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SEVERITY, &rp_pio->severity); - pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_SYSERROR, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SYSERROR, &rp_pio->syserror); - pci_read_config_dword(pdev, dpc->cap_pos + PCI_EXP_DPC_RP_PIO_EXCEPTION, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_EXCEPTION, &rp_pio->exception); /* Get First Error Pointer */ - pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status); + pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); rp_pio->first_error = (status & 0x1f00) >> 8; pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap); @@ -216,27 +214,22 @@ static void dpc_rp_pio_get_info(struct dpc_dev *dpc, return; } - pci_read_config_dword(pdev, - dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG, &rp_pio->header_log.dw0); - pci_read_config_dword(pdev, - dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 4, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 4, &rp_pio->header_log.dw1); - pci_read_config_dword(pdev, - dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 8, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 8, &rp_pio->header_log.dw2); - pci_read_config_dword(pdev, - dpc->cap_pos + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 12, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 12, &rp_pio->header_log.dw3); if (rp_pio->log_size == 4) return; - pci_read_config_dword(pdev, - dpc->cap_pos + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG, + pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG, &rp_pio->impspec_log); for (i = 0; i < rp_pio->log_size - 5; i++) pci_read_config_dword(pdev, - dpc->cap_pos + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, + cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, &rp_pio->tlp_prefix_log[i]); } @@ -255,28 +248,28 @@ static irqreturn_t dpc_irq(int irq, void *context) struct dpc_dev *dpc = (struct dpc_dev *)context; struct pci_dev *pdev = dpc->dev->port; struct device *dev = &dpc->dev->device; - u16 ctl, status, source, reason, ext_reason; + u16 cap = dpc->cap_pos, ctl, status, source, reason, ext_reason; - pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl); + pci_read_config_word(pdev, cap + PCI_EXP_DPC_CTL, &ctl); if (!(ctl & PCI_EXP_DPC_CTL_INT_EN) || ctl == (u16)(~0)) return IRQ_NONE; - pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status); + pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status); if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT)) return IRQ_NONE; if (!(status & PCI_EXP_DPC_STATUS_TRIGGER)) { - pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, + pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS, PCI_EXP_DPC_STATUS_INTERRUPT); return IRQ_HANDLED; } - pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, + pci_write_config_word(pdev, cap + PCI_EXP_DPC_CTL, ctl & ~PCI_EXP_DPC_CTL_INT_EN); - pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_SOURCE_ID, + pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, &source); dev_info(dev, "DPC containment event, status:%#06x source:%#06x\n",