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 #include <asm/sclp.h>
  16
  17 #define zpci_attr(name, fmt, member)                                    \
  18 static ssize_t name##_show(struct device *dev,                          \
  19                            struct device_attribute *attr, char *buf)    \
  20 {                                                                       \
  21         struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));               \
  22                                                                         \
  23         return sprintf(buf, fmt, zdev->member);                         \
  24 }                                                                       \
  25 static DEVICE_ATTR_RO(name)
  26
  27 zpci_attr(function_id, "0x%08x\n", fid);
  28 zpci_attr(function_handle, "0x%08x\n", fh);
  29 zpci_attr(pchid, "0x%04x\n", pchid);
  30 zpci_attr(pfgid, "0x%02x\n", pfgid);
  31 zpci_attr(vfn, "0x%04x\n", vfn);
  32 zpci_attr(pft, "0x%02x\n", pft);
  33 zpci_attr(uid, "0x%x\n", uid);
  34 zpci_attr(segment0, "0x%02x\n", pfip[0]);
  35 zpci_attr(segment1, "0x%02x\n", pfip[1]);
  36 zpci_attr(segment2, "0x%02x\n", pfip[2]);
  37 zpci_attr(segment3, "0x%02x\n", pfip[3]);
  38
  39 static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
  40                              const char *buf, size_t count)
  41 {
  42         struct pci_dev *pdev = to_pci_dev(dev);
  43         struct zpci_dev *zdev = to_zpci(pdev);
  44         int ret;
  45
  46         if (!device_remove_file_self(dev, attr))
  47                 return count;
  48
  49         pci_lock_rescan_remove();
  50         pci_stop_and_remove_bus_device(pdev);
  51         ret = zpci_disable_device(zdev);
  52         if (ret)
  53                 goto error;
  54
  55         ret = zpci_enable_device(zdev);
  56         if (ret)
  57                 goto error;
  58
  59         pci_rescan_bus(zdev->bus);
  60         pci_unlock_rescan_remove();
  61
  62         return count;
  63
  64 error:
  65         pci_unlock_rescan_remove();
  66         return ret;
  67 }
  68 static DEVICE_ATTR_WO(recover);
  69
  70 static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
  71                                 struct bin_attribute *attr, char *buf,
  72                                 loff_t off, size_t count)
  73 {
  74         struct device *dev = kobj_to_dev(kobj);
  75         struct pci_dev *pdev = to_pci_dev(dev);
  76         struct zpci_dev *zdev = to_zpci(pdev);
  77
  78         return memory_read_from_buffer(buf, count, &off, zdev->util_str,
  79                                        sizeof(zdev->util_str));
  80 }
  81 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
  82
  83 static ssize_t report_error_write(struct file *filp, struct kobject *kobj,
  84                                   struct bin_attribute *attr, char *buf,
  85                                   loff_t off, size_t count)
  86 {
  87         struct zpci_report_error_header *report = (void *) buf;
  88         struct device *dev = kobj_to_dev(kobj);
  89         struct pci_dev *pdev = to_pci_dev(dev);
  90         struct zpci_dev *zdev = to_zpci(pdev);
  91         int ret;
  92
  93         if (off || (count < sizeof(*report)))
  94                 return -EINVAL;
  95
  96         ret = sclp_pci_report(report, zdev->fh, zdev->fid);
  97
  98         return ret ? ret : count;
  99 }
 100 static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);
 101
 102 static struct bin_attribute *zpci_bin_attrs[] = {
 103         &bin_attr_util_string,
 104         &bin_attr_report_error,
 105         NULL,
 106 };
 107
 108 static struct attribute *zpci_dev_attrs[] = {
 109         &dev_attr_function_id.attr,
 110         &dev_attr_function_handle.attr,
 111         &dev_attr_pchid.attr,
 112         &dev_attr_pfgid.attr,
 113         &dev_attr_pft.attr,
 114         &dev_attr_vfn.attr,
 115         &dev_attr_uid.attr,
 116         &dev_attr_recover.attr,
 117         NULL,
 118 };
 119 static struct attribute_group zpci_attr_group = {
 120         .attrs = zpci_dev_attrs,
 121         .bin_attrs = zpci_bin_attrs,
 122 };
 123
 124 static struct attribute *pfip_attrs[] = {
 125         &dev_attr_segment0.attr,
 126         &dev_attr_segment1.attr,
 127         &dev_attr_segment2.attr,
 128         &dev_attr_segment3.attr,
 129         NULL,
 130 };
 131 static struct attribute_group pfip_attr_group = {
 132         .name = "pfip",
 133         .attrs = pfip_attrs,
 134 };
 135
 136 const struct attribute_group *zpci_attr_groups[] = {
 137         &zpci_attr_group,
 138         &pfip_attr_group,
 139         NULL,
 140 };