kernel/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 KMSG_COMPONENT "zpci"
   9 #define pr_fmt(fmt) KMSG_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 = to_zpci(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 zpci_attr(vfn, "0x%04x\n", vfn);
  30 zpci_attr(pft, "0x%02x\n", pft);
  31 zpci_attr(uid, "0x%x\n", uid);
  32 zpci_attr(segment0, "0x%02x\n", pfip[0]);
  33 zpci_attr(segment1, "0x%02x\n", pfip[1]);
  34 zpci_attr(segment2, "0x%02x\n", pfip[2]);
  35 zpci_attr(segment3, "0x%02x\n", pfip[3]);
  36
  37 static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
  38                              const char *buf, size_t count)
  39 {
  40         struct pci_dev *pdev = to_pci_dev(dev);
  41         struct zpci_dev *zdev = to_zpci(pdev);
  42         int ret;
  43
  44         if (!device_remove_file_self(dev, attr))
  45                 return count;
  46
  47         pci_lock_rescan_remove();
  48         pci_stop_and_remove_bus_device(pdev);
  49         ret = zpci_disable_device(zdev);
  50         if (ret)
  51                 goto error;
  52
  53         ret = zpci_enable_device(zdev);
  54         if (ret)
  55                 goto error;
  56
  57         pci_rescan_bus(zdev->bus);
  58         pci_unlock_rescan_remove();
  59
  60         return count;
  61
  62 error:
  63         pci_unlock_rescan_remove();
  64         return ret;
  65 }
  66 static DEVICE_ATTR_WO(recover);
  67
  68 static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
  69                                 struct bin_attribute *attr, char *buf,
  70                                 loff_t off, size_t count)
  71 {
  72         struct device *dev = kobj_to_dev(kobj);
  73         struct pci_dev *pdev = to_pci_dev(dev);
  74         struct zpci_dev *zdev = to_zpci(pdev);
  75
  76         return memory_read_from_buffer(buf, count, &off, zdev->util_str,
  77                                        sizeof(zdev->util_str));
  78 }
  79 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
  80 static struct bin_attribute *zpci_bin_attrs[] = {
  81         &bin_attr_util_string,
  82         NULL,
  83 };
  84
  85 static struct attribute *zpci_dev_attrs[] = {
  86         &dev_attr_function_id.attr,
  87         &dev_attr_function_handle.attr,
  88         &dev_attr_pchid.attr,
  89         &dev_attr_pfgid.attr,
  90         &dev_attr_pft.attr,
  91         &dev_attr_vfn.attr,
  92         &dev_attr_uid.attr,
  93         &dev_attr_recover.attr,
  94         NULL,
  95 };
  96 static struct attribute_group zpci_attr_group = {
  97         .attrs = zpci_dev_attrs,
  98         .bin_attrs = zpci_bin_attrs,
  99 };
 100
 101 static struct attribute *pfip_attrs[] = {
 102         &dev_attr_segment0.attr,
 103         &dev_attr_segment1.attr,
 104         &dev_attr_segment2.attr,
 105         &dev_attr_segment3.attr,
 106         NULL,
 107 };
 108 static struct attribute_group pfip_attr_group = {
 109         .name = "pfip",
 110         .attrs = pfip_attrs,
 111 };
 112
 113 const struct attribute_group *zpci_attr_groups[] = {
 114         &zpci_attr_group,
 115         &pfip_attr_group,
 116         NULL,
 117 };