arch/s390/pci/pci_sysfs.c

   1 /*
   2  * Copyright IBM Corp. 2012
   3  *
   4  * Author(s):
   5  *   Jan Glauber <jang@linux.vnet.ibm.com>
   6  */
   7
   8 #define COMPONENT "zPCI"
   9 #define pr_fmt(fmt) COMPONENT ": " fmt
  10
  11 #include <linux/kernel.h>
  12 #include <linux/stat.h>
  13 #include <linux/pci.h>
  14
  15 #define zpci_attr(name, fmt, member)                                    \
  16 static ssize_t name##_show(struct device *dev,                          \
  17                            struct device_attribute *attr, char *buf)    \
  18 {                                                                       \
  19         struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));              \
  20                                                                         \
  21         return sprintf(buf, fmt, zdev->member);                         \
  22 }                                                                       \
  23 static DEVICE_ATTR_RO(name)
  24
  25 zpci_attr(function_id, "0x%08x\n", fid);
  26 zpci_attr(function_handle, "0x%08x\n", fh);
  27 zpci_attr(pchid, "0x%04x\n", pchid);
  28 zpci_attr(pfgid, "0x%02x\n", pfgid);
  29
  30 static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
  31                              const char *buf, size_t count)
  32 {
  33         struct pci_dev *pdev = to_pci_dev(dev);
  34         struct zpci_dev *zdev = get_zdev(pdev);
  35         int ret;
  36
  37         if (!device_remove_file_self(dev, attr))
  38                 return count;
  39
  40         pci_stop_and_remove_bus_device(pdev);
  41         ret = zpci_disable_device(zdev);
  42         if (ret)
  43                 return ret;
  44
  45         ret = zpci_enable_device(zdev);
  46         if (ret)
  47                 return ret;
  48
  49         pci_rescan_bus(zdev->bus);
  50         return count;
  51 }
  52 static DEVICE_ATTR_WO(recover);
  53
  54 static struct attribute *zpci_dev_attrs[] = {
  55         &dev_attr_function_id.attr,
  56         &dev_attr_function_handle.attr,
  57         &dev_attr_pchid.attr,
  58         &dev_attr_pfgid.attr,
  59         &dev_attr_recover.attr,
  60         NULL,
  61 };
  62 static struct attribute_group zpci_attr_group = {
  63         .attrs = zpci_dev_attrs,
  64 };
  65 const struct attribute_group *zpci_attr_groups[] = {
  66         &zpci_attr_group,
  67         NULL,
  68 };