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Subject[PATCH 2/2] Create sysfs attribute 'slot' for mapping PCI device to SMBIOS slot
Date
This patch will use the saved SMBIOS Type 9 values to map a PCI
device to a system slot. This includes devices under a bridge/switch
on an add-in card.

Signed-off-by: Jordan Hargrave <Jordan_Hargrave@dell.com>
---
drivers/pci/pci-label.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 2 ++
2 files changed, 95 insertions(+)

diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
index 024b5c1..0b0954b 100644
--- a/drivers/pci/pci-label.c
+++ b/drivers/pci/pci-label.c
@@ -125,14 +125,107 @@ static struct attribute_group smbios_attr_group = {
.is_visible = smbios_instance_string_exist,
};

+int pci_get_smbios_slot(struct pci_dev *pdev)
+{
+ struct pci_dev *sdev;
+ struct dmi_dev_onboard *dslot;
+ const struct dmi_device *dmi;
+ u8 bus, found;
+
+ dmi = NULL;
+ pdev = pci_physfn(pdev);
+ bus = pdev->bus->number;
+ for(;;) {
+ found = 0;
+ dmi = dmi_find_device(DMI_DEV_TYPE_SYSTEM_SLOT, NULL, dmi);
+ if (dmi == NULL)
+ break;
+ dslot = dmi->device_data;
+ if (pci_domain_nr(pdev->bus) != dslot->segment)
+ continue;
+ sdev = pci_get_domain_bus_and_slot(dslot->segment, dslot->bus,
+ dslot->devfn);
+ if (sdev == NULL)
+ continue;
+
+ if (sdev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
+ bus >= sdev->subordinate->busn_res.start &&
+ bus <= sdev->subordinate->busn_res.end) {
+ /* device is child of bridge */
+ found = 1;
+ }
+ if (sdev->bus->number == bus &&
+ PCI_SLOT(sdev->devfn) == PCI_SLOT(pdev->devfn)) {
+ /* If slot points to PCIE root on a multifunction device,
+ * match exact Bus:Dev:Func. Otherwise match Bus:Dev */
+ if (pci_pcie_type(sdev) != PCI_EXP_TYPE_ROOT_PORT ||
+ PCI_FUNC(sdev->devfn) == PCI_FUNC(pdev->devfn)) {
+ found = 1;
+ }
+ }
+ pci_dev_put(sdev);
+ if (found)
+ return dslot->instance;
+ }
+ return -ENODEV;
+}
+EXPORT_SYMBOL(pci_get_smbios_slot);
+
+static ssize_t smbiosslot_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pdev;
+ int slot;
+
+ pdev = to_pci_dev(dev);
+ slot = pci_get_smbios_slot(pdev);
+ if (slot > 0) {
+ return scnprintf(buf, PAGE_SIZE, "%d\n", slot);
+ }
+ return 0;
+}
+
+static umode_t smbios_slot_exist(struct kobject *kobj, struct attribute *attr,
+ int n)
+{
+ struct device *dev;
+ struct pci_dev *pdev;
+
+ dev = container_of(kobj, struct device, kobj);
+ pdev = to_pci_dev(dev);
+
+ return (pci_get_smbios_slot(pdev) > 0) ? S_IRUGO : 0;
+}
+
+static struct device_attribute smbios_attr_slot = {
+ .attr = {.name = "slot", .mode = 0444},
+ .show = smbiosslot_show,
+};
+
+static struct attribute *smbios_slot_attributes[] = {
+ &smbios_attr_slot.attr,
+ NULL,
+};
+
+static struct attribute_group smbios_slot_attr_group = {
+ .attrs = smbios_slot_attributes,
+ .is_visible = smbios_slot_exist,
+};
+
static int pci_create_smbiosname_file(struct pci_dev *pdev)
{
+ int rc;
+
+ rc = sysfs_create_group(&pdev->dev.kobj, &smbios_slot_attr_group);
+ if (rc != 0)
+ return rc;
return sysfs_create_group(&pdev->dev.kobj, &smbios_attr_group);
}

static void pci_remove_smbiosname_file(struct pci_dev *pdev)
{
sysfs_remove_group(&pdev->dev.kobj, &smbios_attr_group);
+ sysfs_remove_group(&pdev->dev.kobj, &smbios_slot_attr_group);
}
#else
static inline int pci_create_smbiosname_file(struct pci_dev *pdev)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e828e7b..b4c26cb 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1972,4 +1972,6 @@ static inline bool pci_ari_enabled(struct pci_bus *bus)
{
return bus->self && bus->self->ari_enabled;
}
+
+int pci_get_smbios_slot(struct pci_dev *pdev);
#endif /* LINUX_PCI_H */
--
2.5.0


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