From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Yinghai Lu To: Jesse Barnes , x86 Cc: Bjorn Helgaas , Andrew Morton , Linus Torvalds , Greg Kroah-Hartman , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu , Randy Dunlap , linux-doc@vger.kernel.org Subject: [PATCH -v3 47/47] PCI: Add /sys/bus/pci/rescan_root Date: Sun, 18 Mar 2012 22:46:36 -0700 Message-Id: <1332135996-13860-48-git-send-email-yinghai@kernel.org> In-Reply-To: <1332135996-13860-1-git-send-email-yinghai@kernel.org> References: <1332135996-13860-1-git-send-email-yinghai@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: It will be used to rediscover removed pci root buses. Signed-off-by: Yinghai Lu Cc: Randy Dunlap Cc: Greg Kroah-Hartman Cc: linux-doc@vger.kernel.org --- Documentation/ABI/testing/sysfs-bus-pci | 9 +++++++++ drivers/pci/pci-sysfs.c | 19 +++++++++++++++++++ 2 files changed, 28 insertions(+), 0 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 22392de..eb826bd 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -66,6 +66,15 @@ Description: re-discover previously removed devices. Depends on CONFIG_HOTPLUG. +What: /sys/bus/pci/rescan_root +Date: March 2012 +Contact: Linux PCI developers +Description: + Writing a non-zero value to this attribute will + cause a rescan of all PCI root buses in the system, and + re-discover previously removed PCI root buses. + Depends on CONFIG_HOTPLUG. + What: /sys/bus/pci/devices/.../msi_irqs/ Date: September, 2011 Contact: Neil Horman diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index afba77b..c348048 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -302,8 +302,27 @@ static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf, return count; } +void __weak arch_pci_root_rescan(void) { } + +static ssize_t bus_rescan_root_store(struct bus_type *bus, const char *buf, + size_t count) +{ + unsigned long val; + + if (kstrtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val) { + mutex_lock(&pci_remove_rescan_mutex); + arch_pci_root_rescan(); + mutex_unlock(&pci_remove_rescan_mutex); + } + return count; +} + struct bus_attribute pci_bus_attrs[] = { __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store), + __ATTR(rescan_root, (S_IWUSR|S_IWGRP), NULL, bus_rescan_root_store), __ATTR_NULL }; -- 1.7.7