diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci | 11 | ||||
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 26 | ||||
| -rw-r--r-- | drivers/pci/pci.c | 6 | ||||
| -rw-r--r-- | drivers/pci/pci.h | 1 |
4 files changed, 43 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 7f63c7e97773..5da6a14dc326 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -163,6 +163,17 @@ Description: will be present in sysfs. Writing 1 to this file will perform reset. +What: /sys/bus/pci/devices/.../reset_subordinate +Date: October 2024 +Contact: linux-pci@vger.kernel.org +Description: + This is visible only for bridge devices. If you want to reset + all devices attached through the subordinate bus of a specific + bridge device, writing 1 to this will try to do it. This will + affect all devices attached to the system through this bridge + similiar to writing 1 to their individual "reset" file, so use + with caution. + What: /sys/bus/pci/devices/.../vpd Date: February 2008 Contact: Ben Hutchings <bwh@kernel.org> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 5d0f4db1cab7..3e5a117f5b5d 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -521,6 +521,31 @@ static ssize_t bus_rescan_store(struct device *dev, static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL, bus_rescan_store); +static ssize_t reset_subordinate_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct pci_bus *bus = pdev->subordinate; + unsigned long val; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (kstrtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (val) { + int ret = __pci_reset_bus(bus); + + if (ret) + return ret; + } + + return count; +} +static DEVICE_ATTR_WO(reset_subordinate); + #if defined(CONFIG_PM) && defined(CONFIG_ACPI) static ssize_t d3cold_allowed_store(struct device *dev, struct device_attribute *attr, @@ -625,6 +650,7 @@ static struct attribute *pci_dev_attrs[] = { static struct attribute *pci_bridge_attrs[] = { &dev_attr_subordinate_bus_number.attr, &dev_attr_secondary_bus_number.attr, + &dev_attr_reset_subordinate.attr, NULL, }; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index f85f380cdb9b..a16d74beaf58 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5158,6 +5158,8 @@ static void pci_dev_save_and_disable(struct pci_dev *dev) */ if (err_handler && err_handler->reset_prepare) err_handler->reset_prepare(dev); + else if (dev->driver) + pci_warn(dev, "resetting"); /* * Wake-up device prior to save. PM registers default to D0 after @@ -5191,6 +5193,8 @@ static void pci_dev_restore(struct pci_dev *dev) */ if (err_handler && err_handler->reset_done) err_handler->reset_done(dev); + else if (dev->driver) + pci_warn(dev, "reset done"); } /* dev->reset_methods[] is a 0-terminated list of indices into this array */ @@ -5880,7 +5884,7 @@ EXPORT_SYMBOL_GPL(pci_probe_reset_bus); * * Same as above except return -EAGAIN if the bus cannot be locked */ -static int __pci_reset_bus(struct pci_bus *bus) +int __pci_reset_bus(struct pci_bus *bus) { int rc; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index ed35b8366b78..7531e4b005c6 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -104,6 +104,7 @@ bool pci_reset_supported(struct pci_dev *dev); void pci_init_reset_methods(struct pci_dev *dev); int pci_bridge_secondary_bus_reset(struct pci_dev *dev); int pci_bus_error_reset(struct pci_dev *dev); +int __pci_reset_bus(struct pci_bus *bus); struct pci_cap_saved_data { u16 cap_nr; |