[PATCH] pci-sysfs: Make PCI bridge attribute visible in sysfs

[Wong Vee Khee]

From: vwong <vee.khee.wong@xxxxxx>

Export the PCIe link attributes of PCI bridges to sysfs.

Signed-off-by: Wong Vee Khee <vee.khee.wong@xxxxxx>
Signed-off-by: Hui Chun Ong <hui.chun.ong@xxxxxx>
---
 drivers/pci/pci-sysfs.c       | 197 +++++++++++++++++++++++++++++++++++++++++-
 include/uapi/linux/pci_regs.h |   4 +
 2 files changed, 197 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 25d010d..a218c43 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 && linkcap) {
+		switch (linkcap & PCI_EXP_LNKCAP_MLS) {
+		case PCI_EXP_LNKCAP_MLS_8_0GB:
+			speed = "8 GT/s";
+			break;
+		case PCI_EXP_LNKCAP_MLS_5_0GB:
+			speed = "5 GT/s";
+			break;
+		case PCI_EXP_LNKCAP_MLS_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 && linkstat) {
+		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)
 {
@@ -602,12 +723,17 @@ 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,
 };
 
@@ -1540,6 +1666,57 @@ 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 0;
+
+	return a->mode;
+}
+
+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_find_capability(pdev, PCI_CAP_ID_EXP) == 0)
+		return 0;
+
+	return a->mode;
+}
+
+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,
@@ -1574,12 +1751,24 @@ 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 634c9c4..b1770dc 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -517,6 +517,10 @@
 #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_MLS	0x0000000f /* Maximum Link Speeds */
+#define  PCI_EXP_LNKCAP_MLS_2_5GB 0x00000001 /* LNKCAP2 SLS Vector bit 0 */
+#define  PCI_EXP_LNKCAP_MLS_5_0GB 0x00000002 /* LNKCAP2 SLS Vector bit 1 */
+#define  PCI_EXP_LNKCAP_MLS_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