From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754981AbdEKKFC (ORCPT ); Thu, 11 May 2017 06:05:02 -0400 Received: from mx0a-00010702.pphosted.com ([148.163.156.75]:44764 "EHLO mx0b-00010702.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751028AbdEKKFA (ORCPT ); Thu, 11 May 2017 06:05:00 -0400 From: Wong Vee Khee To: CC: , , , , , , , , , vwong Subject: [PATCH v2] pci-sysfs: Make PCI bridge attribute visible in sysfs Date: Thu, 11 May 2017 18:04:35 +0800 Message-ID: <1494497075-92247-1-git-send-email-vee.khee.wong@ni.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-05-11_07:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_policy_notspam policy=outbound_policy score=30 priorityscore=1501 malwarescore=0 suspectscore=4 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=30 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1705110056 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: vwong Export the PCIe link attributes of PCI bridges to sysfs. Signed-off-by: Wong Vee Khee Signed-off-by: Hui Chun Ong --- drivers/pci/pci-sysfs.c | 197 +++++++++++++++++++++++++++++++++++++++++- include/uapi/linux/pci_regs.h | 1 + 2 files changed, 194 insertions(+), 4 deletions(-) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 31e9961..a2ada91 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -154,6 +154,127 @@ static ssize_t resource_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(resource); +static ssize_t max_link_speed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + u32 linkcap; + int err; + const char *speed; + + err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap); + + if (!err) { + switch (linkcap & PCI_EXP_LNKCAP_SLS) { + case PCI_EXP_LNKCAP_SLS_8_0GB: + speed = "8 GT/s"; + break; + case PCI_EXP_LNKCAP_SLS_5_0GB: + speed = "5 GT/s"; + break; + case PCI_EXP_LNKCAP_SLS_2_5GB: + speed = "2.5 GT/s"; + break; + default: + speed = "Unknown speed"; + } + + return sprintf(buf, "%s\n", speed); + } + + return -EINVAL; +} +static DEVICE_ATTR_RO(max_link_speed); + +static ssize_t max_link_width_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + u32 linkcap; + int err; + + err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap); + + return err ? -EINVAL : sprintf( + buf, "%u\n", (linkcap & PCI_EXP_LNKCAP_MLW) >> 4); +} +static DEVICE_ATTR_RO(max_link_width); + +static ssize_t current_link_speed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + u16 linkstat; + int err; + const char *speed; + + err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat); + + if (!err) { + switch (linkstat & PCI_EXP_LNKSTA_CLS) { + case PCI_EXP_LNKSTA_CLS_8_0GB: + speed = "8 GT/s"; + break; + case PCI_EXP_LNKSTA_CLS_5_0GB: + speed = "5 GT/s"; + break; + case PCI_EXP_LNKSTA_CLS_2_5GB: + speed = "2.5 GT/s"; + break; + default: + speed = "Unknown speed"; + } + + return sprintf(buf, "%s\n", speed); + } + + return -EINVAL; +} +static DEVICE_ATTR_RO(current_link_speed); + +static ssize_t current_link_width_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + u16 linkstat; + int err; + + err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat); + + return err ? -EINVAL : sprintf( + buf, "%u\n", + (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT); +} +static DEVICE_ATTR_RO(current_link_width); + +static ssize_t secondary_bus_number_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + u8 sec_bus; + int err; + + err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus); + + return err ? -EINVAL : sprintf(buf, "%u\n", sec_bus); +} +static DEVICE_ATTR_RO(secondary_bus_number); + +static ssize_t subordinate_bus_number_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pci_dev = to_pci_dev(dev); + u8 sub_bus; + int err; + + err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus); + + return err ? -EINVAL : sprintf(buf, "%u\n", sub_bus); +} +static DEVICE_ATTR_RO(subordinate_bus_number); + static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -629,12 +750,17 @@ static struct attribute *pci_dev_attrs[] = { NULL, }; -static const struct attribute_group pci_dev_group = { - .attrs = pci_dev_attrs, +static struct attribute *pci_bridge_attrs[] = { + &dev_attr_subordinate_bus_number.attr, + &dev_attr_secondary_bus_number.attr, + NULL, }; -const struct attribute_group *pci_dev_groups[] = { - &pci_dev_group, +static struct attribute *pcie_dev_attrs[] = { + &dev_attr_current_link_speed.attr, + &dev_attr_current_link_width.attr, + &dev_attr_max_link_width.attr, + &dev_attr_max_link_speed.attr, NULL, }; @@ -1557,6 +1683,57 @@ static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj, return a->mode; } +static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct pci_dev *pdev = to_pci_dev(dev); + + if (pci_is_bridge(pdev)) + return a->mode; + + return 0; +} + +static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct pci_dev *pdev = to_pci_dev(dev); + + if (pci_is_pcie(pdev)) + return a->mode; + + return 0; +} + +static const struct attribute_group pci_dev_group = { + .attrs = pci_dev_attrs, +}; + +const struct attribute_group *pci_dev_groups[] = { + &pci_dev_group, + NULL, +}; + +static const struct attribute_group pci_bridge_group = { + .attrs = pci_bridge_attrs, +}; + +const struct attribute_group *pci_bridge_groups[] = { + &pci_bridge_group, + NULL, +}; + +static const struct attribute_group pcie_dev_group = { + .attrs = pcie_dev_attrs, +}; + +const struct attribute_group *pcie_dev_groups[] = { + &pcie_dev_group, + NULL, +}; + static struct attribute_group pci_dev_hp_attr_group = { .attrs = pci_dev_hp_attrs, .is_visible = pci_dev_hp_attrs_are_visible, @@ -1592,12 +1769,24 @@ static struct attribute_group pci_dev_attr_group = { .is_visible = pci_dev_attrs_are_visible, }; +static struct attribute_group pci_bridge_attr_group = { + .attrs = pci_bridge_attrs, + .is_visible = pci_bridge_attrs_are_visible, +}; + +static struct attribute_group pcie_dev_attr_group = { + .attrs = pcie_dev_attrs, + .is_visible = pcie_dev_attrs_are_visible, +}; + static const struct attribute_group *pci_dev_attr_groups[] = { &pci_dev_attr_group, &pci_dev_hp_attr_group, #ifdef CONFIG_PCI_IOV &sriov_dev_attr_group, #endif + &pci_bridge_attr_group, + &pcie_dev_attr_group, NULL, }; diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index d56bb00..c22d3eb 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -517,6 +517,7 @@ #define PCI_EXP_LNKCAP_SLS 0x0000000f /* Supported Link Speeds */ #define PCI_EXP_LNKCAP_SLS_2_5GB 0x00000001 /* LNKCAP2 SLS Vector bit 0 */ #define PCI_EXP_LNKCAP_SLS_5_0GB 0x00000002 /* LNKCAP2 SLS Vector bit 1 */ +#define PCI_EXP_LNKCAP_SLS_8_0GB 0x00000003 /* LNKCAP2 SLS Vector bit 2 */ #define PCI_EXP_LNKCAP_MLW 0x000003f0 /* Maximum Link Width */ #define PCI_EXP_LNKCAP_ASPMS 0x00000c00 /* ASPM Support */ #define PCI_EXP_LNKCAP_L0SEL 0x00007000 /* L0s Exit Latency */ -- 2.7.4