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Date: Fri, 10 Jul 2015 17:02:46 -0500
From: Jordan Hargrave <jharg93@...il.com>
To: jdelvare@...e.de, bhelgaas@...gle.com,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
jharg93@...il.com, Jordan_Hargrave@...l.com
Subject: [PATCH] Add support for reading SMBIOS Slot number for PCI devices
From: Jordan Hargrave <Jordan_Hargrave@...l.com>
There currently isn't an easy way to determine which PCI devices belong to
system slots. This patch adds support to read SMBIOS Type 9 (System Slots).
Signed-off-by: Jordan Hargrave <Jordan_Hargrave@...l.com>
---
drivers/firmware/dmi_scan.c | 39 ++++++++++++++++++++
drivers/pci/pci-label.c | 89 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/dmi.h | 1 +
3 files changed, 129 insertions(+)
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index ac1ce4a..8f95897 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -356,6 +356,41 @@ static void __init dmi_save_extended_devices(const struct dmi_header *dm)
dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
}
+static void __init dmi_save_dev_slot(int instance, int segment, int bus, int devfn, const char *name)
+{
+ struct dmi_dev_onboard *slot;
+
+ slot = dmi_alloc(sizeof(*slot) + strlen(name) + 1);
+ if (!slot) {
+ printk(KERN_ERR "dmi_save_system_slot: out of memory.\n");
+ return;
+ }
+ slot->instance = instance;
+ slot->segment = segment;
+ slot->bus = bus;
+ slot->devfn = devfn;
+
+ strcpy((char *)&slot[1], name);
+ slot->dev.type = DMI_DEV_TYPE_SYSTEM_SLOT;
+ slot->dev.name = (char *)&slot[1];
+ slot->dev.device_data = slot;
+
+ list_add(&slot->dev.list, &dmi_devices);
+}
+
+
+static void __init dmi_save_system_slot(const struct dmi_header *dm)
+{
+ const char *name;
+ const u8 *d = (u8*)dm;
+
+ if (dm->type == DMI_ENTRY_SYSTEM_SLOT && dm->length >= 0x11) {
+ name = dmi_string_nosave(dm, *(d + 0x04));
+ dmi_save_dev_slot(*(u16 *)(d + 0x09), *(u16 *)(d + 0xD),
+ *(d + 0xF), *(d + 0x10), name);
+ }
+}
+
static void __init count_mem_devices(const struct dmi_header *dm, void *v)
{
if (dm->type != DMI_ENTRY_MEM_DEVICE)
@@ -437,6 +472,10 @@ static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
break;
case 41: /* Onboard Devices Extended Information */
dmi_save_extended_devices(dm);
+ break;
+ case 9: /* System Slots */
+ dmi_save_system_slot(dm);
+ break;
}
}
diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
index 024b5c1..38dfb45 100644
--- a/drivers/pci/pci-label.c
+++ b/drivers/pci/pci-label.c
@@ -125,14 +125,103 @@ static struct attribute_group smbios_attr_group = {
.is_visible = smbios_instance_string_exist,
};
+static int smbios_getslot(struct pci_dev *pdev)
+{
+ struct pci_dev *sdev;
+ struct dmi_dev_onboard *dslot;
+ const struct dmi_device *dmi;
+ u8 sub, sec, bus;
+
+ dmi = NULL;
+ if (pdev->is_virtfn) {
+ /* Get Physical device for SR-IOV */
+ pdev = pdev->physfn;
+ }
+ bus = pdev->bus->number;
+ while ((dmi = dmi_find_device(DMI_DEV_TYPE_SYSTEM_SLOT, NULL, dmi)) != NULL) {
+ sec = sub = -1;
+
+ dslot = dmi->device_data;
+ 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) {
+ pci_read_config_byte(sdev, PCI_SECONDARY_BUS, &sec);
+ pci_read_config_byte(sdev, PCI_SUBORDINATE_BUS, &sub);
+ if (bus >= sec && bus <= sub) {
+ /* device is child of bridge */
+ return dslot->instance;
+ }
+ }
+ if (pci_domain_nr(sdev->bus) == pci_domain_nr(pdev->bus) &&
+ sdev->bus->number == pdev->bus->number &&
+ PCI_SLOT(sdev->devfn) == PCI_SLOT(pdev->devfn)) {
+ /* Match domain:bus:dev. If PCIE root, only match function */
+ if (PCI_FUNC(sdev->devfn) == PCI_FUNC(pdev->devfn) ||
+ pci_pcie_type(sdev) != PCI_EXP_TYPE_ROOT_PORT) {
+ return dslot->instance;
+ }
+ }
+ }
+ return -ENODEV;
+}
+
+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 = smbios_getslot(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 (smbios_getslot(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/dmi.h b/include/linux/dmi.h
index 5055ac3..09f42e7 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -22,6 +22,7 @@ enum dmi_device_type {
DMI_DEV_TYPE_IPMI = -1,
DMI_DEV_TYPE_OEM_STRING = -2,
DMI_DEV_TYPE_DEV_ONBOARD = -3,
+ DMI_DEV_TYPE_SYSTEM_SLOT = -4,
};
enum dmi_entry_type {
--
1.8.3.1
--
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