[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20090320205641.12275.37784.stgit@bob.kio>
Date: Fri, 20 Mar 2009 14:56:41 -0600
From: Alex Chiang <achiang@...com>
To: jbarnes@...tuousgeek.org
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
Trent Piepho <xyzzy@...akeasy.org>,
Alex Chiang <achiang@...com>
Subject: [PATCH v5 10/13] 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@...akeasy.org>
Signed-off-by: Alex Chiang <achiang@...com>
---
Documentation/ABI/testing/sysfs-bus-pci | 10 ++++++++++
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 1350fa6..ba0f0e7 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@...r.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@...arflare.com>
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index e16990e..e9a8706 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,
};
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists