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| author | Alex Chiang <achiang@hp.com> | 2009-03-20 14:56:41 -0600 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-03-20 14:59:07 -0700 |
| commit | 738a6396c223b486304dda778119dbbca563f019 (patch) | |
| tree | ee5f2801ed439d9d969598621de7d2b3ba8f8d0a | |
| parent | 77c27c7b49d69d45ccb94e481653f024f1ac6650 (diff) | |
| download | linux-738a6396c223b486304dda778119dbbca563f019.tar.gz linux-738a6396c223b486304dda778119dbbca563f019.tar.bz2 linux-738a6396c223b486304dda778119dbbca563f019.zip | |
PCI: Introduce /sys/bus/pci/devices/.../rescan
This interface allows the user to force a rescan of the device's
parent bus and all subordinate buses, and rediscover devices removed
earlier from this part of the device tree.
Cc: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci | 10 | ||||
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 19 |
2 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index daa791a9e85e..97ad190e13af 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -74,6 +74,16 @@ Description: hot-remove the PCI device and any of its children. Depends on CONFIG_HOTPLUG. +What: /sys/bus/pci/devices/.../rescan +Date: January 2009 +Contact: Linux PCI developers <linux-pci@vger.kernel.org> +Description: + Writing a non-zero value to this attribute will + force a rescan of the device's parent bus and all + child buses, and re-discover devices removed earlier + from this part of the device tree. + Depends on CONFIG_HOTPLUG. + What: /sys/bus/pci/devices/.../vpd Date: February 2008 Contact: Ben Hutchings <bhutchings@solarflare.com> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index e16990ecc024..e9a8706a6401 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -244,6 +244,24 @@ struct bus_attribute pci_bus_attrs[] = { __ATTR_NULL }; +static ssize_t +dev_rescan_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val; + struct pci_dev *pdev = to_pci_dev(dev); + + if (strict_strtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val) { + mutex_lock(&pci_remove_rescan_mutex); + pci_rescan_bus(pdev->bus); + mutex_unlock(&pci_remove_rescan_mutex); + } + return count; +} + static void remove_callback(struct device *dev) { struct pci_dev *pdev = to_pci_dev(dev); @@ -298,6 +316,7 @@ struct device_attribute pci_dev_attrs[] = { __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store), #ifdef CONFIG_HOTPLUG __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store), + __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store), #endif __ATTR_NULL, }; |