diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci | 40 | ||||
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 37 | ||||
| -rw-r--r-- | drivers/pci/slot.c | 48 |
3 files changed, 125 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 25be3250f7d..428676cfa61 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -133,6 +133,46 @@ Description: The symbolic link points to the PCI device sysfs entry of the Physical Function this device associates with. + +What: /sys/bus/pci/slots/... +Date: April 2005 (possibly older) +KernelVersion: 2.6.12 (possibly older) +Contact: linux-pci@vger.kernel.org +Description: + When the appropriate driver is loaded, it will create a + directory per claimed physical PCI slot in + /sys/bus/pci/slots/. The names of these directories are + specific to the driver, which in turn, are specific to the + platform, but in general, should match the label on the + machine's physical chassis. + + The drivers that can create slot directories include the + PCI hotplug drivers, and as of 2.6.27, the pci_slot driver. + + The slot directories contain, at a minimum, a file named + 'address' which contains the PCI bus:device:function tuple. + Other files may appear as well, but are specific to the + driver. + +What: /sys/bus/pci/slots/.../function[0-7] +Date: March 2010 +KernelVersion: 2.6.35 +Contact: linux-pci@vger.kernel.org +Description: + If PCI slot directories (as described above) are created, + and the physical slot is actually populated with a device, + symbolic links in the slot directory pointing to the + device's PCI functions are created as well. + +What: /sys/bus/pci/devices/.../slot +Date: March 2010 +KernelVersion: 2.6.35 +Contact: linux-pci@vger.kernel.org +Description: + If PCI slot directories (as described above) are created, + a symbolic link pointing to the slot directory will be + created as well. + What: /sys/bus/pci/slots/.../module Date: June 2009 Contact: linux-pci@vger.kernel.org diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index fad93983bfe..941e939d1da 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1011,6 +1011,39 @@ error: return retval; } +static void pci_remove_slot_links(struct pci_dev *dev) +{ + char func[10]; + struct pci_slot *slot; + + sysfs_remove_link(&dev->dev.kobj, "slot"); + list_for_each_entry(slot, &dev->bus->slots, list) { + if (slot->number != PCI_SLOT(dev->devfn)) + continue; + snprintf(func, 10, "function%d", PCI_FUNC(dev->devfn)); + sysfs_remove_link(&slot->kobj, func); + } +} + +static int pci_create_slot_links(struct pci_dev *dev) +{ + int result = 0; + char func[10]; + struct pci_slot *slot; + + list_for_each_entry(slot, &dev->bus->slots, list) { + if (slot->number != PCI_SLOT(dev->devfn)) + continue; + result = sysfs_create_link(&dev->dev.kobj, &slot->kobj, "slot"); + if (result) + goto out; + snprintf(func, 10, "function%d", PCI_FUNC(dev->devfn)); + result = sysfs_create_link(&slot->kobj, &dev->dev.kobj, func); + } +out: + return result; +} + int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev) { int retval; @@ -1073,6 +1106,8 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev) if (retval) goto err_vga_file; + pci_create_slot_links(pdev); + return 0; err_vga_file: @@ -1122,6 +1157,8 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev) if (!sysfs_initialized) return; + pci_remove_slot_links(pdev); + pci_remove_capabilities_sysfs(pdev); if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE) diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c index 659eaa0fc48..e0189cf7c55 100644 --- a/drivers/pci/slot.c +++ b/drivers/pci/slot.c @@ -97,6 +97,50 @@ static ssize_t cur_speed_read_file(struct pci_slot *slot, char *buf) return bus_speed_read(slot->bus->cur_bus_speed, buf); } +static void remove_sysfs_files(struct pci_slot *slot) +{ + char func[10]; + struct list_head *tmp; + + list_for_each(tmp, &slot->bus->devices) { + struct pci_dev *dev = pci_dev_b(tmp); + if (PCI_SLOT(dev->devfn) != slot->number) + continue; + sysfs_remove_link(&dev->dev.kobj, "slot"); + + snprintf(func, 10, "function%d", PCI_FUNC(dev->devfn)); + sysfs_remove_link(&slot->kobj, func); + } +} + +static int create_sysfs_files(struct pci_slot *slot) +{ + int result; + char func[10]; + struct list_head *tmp; + + list_for_each(tmp, &slot->bus->devices) { + struct pci_dev *dev = pci_dev_b(tmp); + if (PCI_SLOT(dev->devfn) != slot->number) + continue; + + result = sysfs_create_link(&dev->dev.kobj, &slot->kobj, "slot"); + if (result) + goto fail; + + snprintf(func, 10, "function%d", PCI_FUNC(dev->devfn)); + result = sysfs_create_link(&slot->kobj, &dev->dev.kobj, func); + if (result) + goto fail; + } + + return 0; + +fail: + remove_sysfs_files(slot); + return result; +} + static void pci_slot_release(struct kobject *kobj) { struct pci_dev *dev; @@ -109,6 +153,8 @@ static void pci_slot_release(struct kobject *kobj) if (PCI_SLOT(dev->devfn) == slot->number) dev->slot = NULL; + remove_sysfs_files(slot); + list_del(&slot->list); kfree(slot); @@ -300,6 +346,8 @@ placeholder: INIT_LIST_HEAD(&slot->list); list_add(&slot->list, &parent->slots); + create_sysfs_files(slot); + list_for_each_entry(dev, &parent->devices, bus_list) if (PCI_SLOT(dev->devfn) == slot_nr) dev->slot = slot; |