From patchwork Wed May 12 14:37:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongdong Liu X-Patchwork-Id: 12253951 X-Patchwork-Delegate: kuba@kernel.org 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 2996DC43460 for ; Wed, 12 May 2021 14:37:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDBA761370 for ; Wed, 12 May 2021 14:37:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231373AbhELOjF (ORCPT ); Wed, 12 May 2021 10:39:05 -0400 Received: from szxga08-in.huawei.com ([45.249.212.255]:2304 "EHLO szxga08-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231192AbhELOi4 (ORCPT ); Wed, 12 May 2021 10:38:56 -0400 Received: from dggeme758-chm.china.huawei.com (unknown [172.30.72.57]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4FgHMs74gJz19PGD; Wed, 12 May 2021 22:33:29 +0800 (CST) Received: from SZX1000464847.huawei.com (10.21.59.169) by dggeme758-chm.china.huawei.com (10.3.19.104) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Wed, 12 May 2021 22:37:45 +0800 From: Dongdong Liu To: , , , , CC: , Subject: [PATCH V3 1/6] PCI: Use cached Device Capabilities Register Date: Wed, 12 May 2021 22:37:32 +0800 Message-ID: <20210512143737.42352-2-liudongdong3@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512143737.42352-1-liudongdong3@huawei.com> References: <20210512143737.42352-1-liudongdong3@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.21.59.169] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggeme758-chm.china.huawei.com (10.3.19.104) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org It will make sense to store the pcie_devcap value in the pci_dev structure instead of reading Device Capabilities Register multiple times. The fisrt place to use pcie_devcap is in set_pcie_port_type(), get the pcie_devcap value here, then use cached pcie_devcap in the needed place. Signed-off-by: Dongdong Liu Acked-by: Hans Verkuil --- drivers/media/pci/cobalt/cobalt-driver.c | 4 ++-- drivers/pci/pci.c | 5 +---- drivers/pci/pcie/aspm.c | 11 ++++------- drivers/pci/probe.c | 11 +++-------- drivers/pci/quirks.c | 3 +-- include/linux/pci.h | 1 + 6 files changed, 12 insertions(+), 23 deletions(-) -- 2.7.4 diff --git a/drivers/media/pci/cobalt/cobalt-driver.c b/drivers/media/pci/cobalt/cobalt-driver.c index 839503e..04e735f 100644 --- a/drivers/media/pci/cobalt/cobalt-driver.c +++ b/drivers/media/pci/cobalt/cobalt-driver.c @@ -193,11 +193,11 @@ void cobalt_pcie_status_show(struct cobalt *cobalt) return; /* Device */ - pcie_capability_read_dword(pci_dev, PCI_EXP_DEVCAP, &capa); pcie_capability_read_word(pci_dev, PCI_EXP_DEVCTL, &ctrl); pcie_capability_read_word(pci_dev, PCI_EXP_DEVSTA, &stat); cobalt_info("PCIe device capability 0x%08x: Max payload %d\n", - capa, get_payload_size(capa & PCI_EXP_DEVCAP_PAYLOAD)); + capa, + get_payload_size(pci_dev->pcie_devcap & PCI_EXP_DEVCAP_PAYLOAD)); cobalt_info("PCIe device control 0x%04x: Max payload %d. Max read request %d\n", ctrl, get_payload_size((ctrl & PCI_EXP_DEVCTL_PAYLOAD) >> 5), diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index b717680..68ccd77 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4620,13 +4620,10 @@ EXPORT_SYMBOL(pci_wait_for_pending_transaction); */ bool pcie_has_flr(struct pci_dev *dev) { - u32 cap; - if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) return false; - pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); - return cap & PCI_EXP_DEVCAP_FLR; + return dev->pcie_devcap & PCI_EXP_DEVCAP_FLR; } EXPORT_SYMBOL_GPL(pcie_has_flr); diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index ac0557a..d637564 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -660,7 +660,7 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist) /* Get and check endpoint acceptable latencies */ list_for_each_entry(child, &linkbus->devices, bus_list) { - u32 reg32, encoding; + u32 encoding; struct aspm_latency *acceptable = &link->acceptable[PCI_FUNC(child->devfn)]; @@ -668,12 +668,11 @@ static void pcie_aspm_cap_init(struct pcie_link_state *link, int blacklist) pci_pcie_type(child) != PCI_EXP_TYPE_LEG_END) continue; - pcie_capability_read_dword(child, PCI_EXP_DEVCAP, ®32); /* Calculate endpoint L0s acceptable latency */ - encoding = (reg32 & PCI_EXP_DEVCAP_L0S) >> 6; + encoding = (child->pcie_devcap & PCI_EXP_DEVCAP_L0S) >> 6; acceptable->l0s = calc_l0s_acceptable(encoding); /* Calculate endpoint L1 acceptable latency */ - encoding = (reg32 & PCI_EXP_DEVCAP_L1) >> 9; + encoding = (child->pcie_devcap & PCI_EXP_DEVCAP_L1) >> 9; acceptable->l1 = calc_l1_acceptable(encoding); pcie_aspm_check_latency(child); @@ -808,7 +807,6 @@ static void free_link_state(struct pcie_link_state *link) static int pcie_aspm_sanity_check(struct pci_dev *pdev) { struct pci_dev *child; - u32 reg32; /* * Some functions in a slot might not all be PCIe functions, @@ -831,8 +829,7 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev) * Disable ASPM for pre-1.1 PCIe device, we follow MS to use * RBER bit to determine if a function is 1.1 version device */ - pcie_capability_read_dword(child, PCI_EXP_DEVCAP, ®32); - if (!(reg32 & PCI_EXP_DEVCAP_RBER) && !aspm_force) { + if (!(child->pcie_devcap & PCI_EXP_DEVCAP_RBER) && !aspm_force) { pci_info(child, "disabling ASPM on pre-1.1 PCIe device. You can enable it with 'pcie_aspm=force'\n"); return -EINVAL; } diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 3a62d09..7963ab2 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1497,8 +1497,8 @@ void set_pcie_port_type(struct pci_dev *pdev) pdev->pcie_cap = pos; pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); pdev->pcie_flags_reg = reg16; - pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); - pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; + pci_read_config_dword(pdev, pos + PCI_EXP_DEVCAP, &pdev->pcie_devcap); + pdev->pcie_mpss = pdev->pcie_devcap & PCI_EXP_DEVCAP_PAYLOAD; parent = pci_upstream_bridge(pdev); if (!parent) @@ -2008,18 +2008,13 @@ static void pci_configure_mps(struct pci_dev *dev) int pci_configure_extended_tags(struct pci_dev *dev, void *ign) { struct pci_host_bridge *host; - u32 cap; u16 ctl; int ret; if (!pci_is_pcie(dev)) return 0; - ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); - if (ret) - return 0; - - if (!(cap & PCI_EXP_DEVCAP_EXT_TAG)) + if (!(dev->pcie_devcap & PCI_EXP_DEVCAP_EXT_TAG)) return 0; ret = pcie_capability_read_word(dev, PCI_EXP_DEVCTL, &ctl); diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index dcb229d..b89b438 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -5073,8 +5073,7 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev) pdev->pcie_cap = pos; pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16); pdev->pcie_flags_reg = reg16; - pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16); - pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD; + pdev->pcie_mpss = pdev->pcie_devcap & PCI_EXP_DEVCAP_PAYLOAD; pdev->cfg_size = PCI_CFG_SPACE_EXP_SIZE; if (pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status) != diff --git a/include/linux/pci.h b/include/linux/pci.h index c20211e..555a3ac 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -340,6 +340,7 @@ struct pci_dev { u8 rom_base_reg; /* Config register controlling ROM */ u8 pin; /* Interrupt pin this device uses */ u16 pcie_flags_reg; /* Cached PCIe Capabilities Register */ + u32 pcie_devcap; /* Cached Device Capabilities Register */ unsigned long *dma_alias_mask;/* Mask of enabled devfn aliases */ struct pci_driver *driver; /* Driver bound to this device */