From bdee9d98d281d84718eaff6bf0dd2b6ad418b36f Mon Sep 17 00:00:00 2001 From: Doug Thompson Date: Wed, 14 Jun 2006 16:59:48 -0700 Subject: [PATCH] PCI: Bus Parity Status sysfs interface From: Doug Thompson This patch adds the 'broken_parity_status' sysfs attribute file to a PCI device. Reading this attribute a userland program can determine if PCI device provides false positives (value of 1) in its generation of PCI Parity status, or not (value of 0). As PCI devices are found to be 'bad' in this regard, userland programs can also set the appropriate value (root access only) of a faulty device. This per device information will be used in the EDAC PCI Parity scanner code in a future patch once this interface becomes available. Signed-off-by: Doug Thompson Signed-off-by: Greg Kroah-Hartman --- drivers/pci/pci-sysfs.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 37897a8c95e0e..bc405c035ce34 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -45,6 +45,28 @@ pci_config_attr(class, "0x%06x\n"); pci_config_attr(irq, "%u\n"); pci_config_attr(is_enabled, "%u\n"); +static ssize_t broken_parity_status_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + return sprintf (buf, "%u\n", pdev->broken_parity_status); +} + +static ssize_t broken_parity_status_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pci_dev *pdev = to_pci_dev(dev); + ssize_t consumed = -EINVAL; + + if ((count > 0) && (*buf == '0' || *buf == '1')) { + pdev->broken_parity_status = *buf == '1' ? 1 : 0; + consumed = count; + } + return consumed; +} + static ssize_t local_cpus_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -122,6 +144,8 @@ struct device_attribute pci_dev_attrs[] = { __ATTR_RO(local_cpus), __ATTR_RO(modalias), __ATTR(enable, 0600, is_enabled_show, is_enabled_store), + __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR), + broken_parity_status_show,broken_parity_status_store), __ATTR_NULL, }; -- cgit 1.2.3-korg