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 = 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 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 = get_zdev(pdev);
  42         int ret;
  43
  44         if (!device_remove_file_self(dev, attr))
  45                 return count;
  46
  47         pci_stop_and_remove_bus_device(pdev);
  48         ret = zpci_disable_device(zdev);
  49         if (ret)
  50                 return ret;
  51
  52         ret = zpci_enable_device(zdev);
  53         if (ret)
  54                 return ret;
  55
  56         pci_rescan_bus(zdev->bus);
  57         return count;
  58 }
  59 static DEVICE_ATTR_WO(recover);
  60
  61 static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
  62                                 struct bin_attribute *attr, char *buf,
  63                                 loff_t off, size_t count)
  64 {
  65         struct device *dev = kobj_to_dev(kobj);
  66         struct pci_dev *pdev = to_pci_dev(dev);
  67         struct zpci_dev *zdev = get_zdev(pdev);
  68
  69         return memory_read_from_buffer(buf, count, &off, zdev->util_str,
  70                                        sizeof(zdev->util_str));
  71 }
  72 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
  73 static struct bin_attribute *zpci_bin_attrs[] = {
  74         &bin_attr_util_string,
  75         NULL,
  76 };
  77
  78 static struct attribute *zpci_dev_attrs[] = {
  79         &dev_attr_function_id.attr,
  80         &dev_attr_function_handle.attr,
  81         &dev_attr_pchid.attr,
  82         &dev_attr_pfgid.attr,
  83         &dev_attr_pft.attr,
  84         &dev_attr_vfn.attr,
  85         &dev_attr_uid.attr,
  86         &dev_attr_recover.attr,
  87         NULL,
  88 };
  89 static struct attribute_group zpci_attr_group = {
  90         .attrs = zpci_dev_attrs,
  91         .bin_attrs = zpci_bin_attrs,
  92 };
  93
  94 static struct attribute *pfip_attrs[] = {
  95         &dev_attr_segment0.attr,
  96         &dev_attr_segment1.attr,
  97         &dev_attr_segment2.attr,
  98         &dev_attr_segment3.attr,
  99         NULL,
 100 };
 101 static struct attribute_group pfip_attr_group = {
 102         .name = "pfip",
 103         .attrs = pfip_attrs,
 104 };
 105
 106 const struct attribute_group *zpci_attr_groups[] = {
 107         &zpci_attr_group,
 108         &pfip_attr_group,
 109         NULL,
 110 };