arch/s390/pci/pci_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2012
   4  *
   5  * Author(s):
   6  *   Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8
   9 #define KMSG_COMPONENT "zpci"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/kernel.h>
  13 #include <linux/stat.h>
  14 #include <linux/pci.h>
  15
  16 #include <asm/sclp.h>
  17
  18 #define zpci_attr(name, fmt, member)                                    \
  19 static ssize_t name##_show(struct device *dev,                          \
  20                            struct device_attribute *attr, char *buf)    \
  21 {                                                                       \
  22         struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));               \
  23                                                                         \
  24         return sprintf(buf, fmt, zdev->member);                         \
  25 }                                                                       \
  26 static DEVICE_ATTR_RO(name)
  27
  28 zpci_attr(function_id, "0x%08x\n", fid);
  29 zpci_attr(function_handle, "0x%08x\n", fh);
  30 zpci_attr(pchid, "0x%04x\n", pchid);
  31 zpci_attr(pfgid, "0x%02x\n", pfgid);
  32 zpci_attr(vfn, "0x%04x\n", vfn);
  33 zpci_attr(pft, "0x%02x\n", pft);
  34 zpci_attr(uid, "0x%x\n", uid);
  35 zpci_attr(segment0, "0x%02x\n", pfip[0]);
  36 zpci_attr(segment1, "0x%02x\n", pfip[1]);
  37 zpci_attr(segment2, "0x%02x\n", pfip[2]);
  38 zpci_attr(segment3, "0x%02x\n", pfip[3]);
  39
  40 static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
  41                              const char *buf, size_t count)
  42 {
  43         struct pci_dev *pdev = to_pci_dev(dev);
  44         struct zpci_dev *zdev = to_zpci(pdev);
  45         int ret;
  46
  47         if (!device_remove_file_self(dev, attr))
  48                 return count;
  49
  50         pci_lock_rescan_remove();
  51         pci_stop_and_remove_bus_device(pdev);
  52         ret = zpci_disable_device(zdev);
  53         if (ret)
  54                 goto error;
  55
  56         ret = zpci_enable_device(zdev);
  57         if (ret)
  58                 goto error;
  59
  60         pci_rescan_bus(zdev->bus);
  61         pci_unlock_rescan_remove();
  62
  63         return count;
  64
  65 error:
  66         pci_unlock_rescan_remove();
  67         return ret;
  68 }
  69 static DEVICE_ATTR_WO(recover);
  70
  71 static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
  72                                 struct bin_attribute *attr, char *buf,
  73                                 loff_t off, size_t count)
  74 {
  75         struct device *dev = kobj_to_dev(kobj);
  76         struct pci_dev *pdev = to_pci_dev(dev);
  77         struct zpci_dev *zdev = to_zpci(pdev);
  78
  79         return memory_read_from_buffer(buf, count, &off, zdev->util_str,
  80                                        sizeof(zdev->util_str));
  81 }
  82 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
  83
  84 static ssize_t report_error_write(struct file *filp, struct kobject *kobj,
  85                                   struct bin_attribute *attr, char *buf,
  86                                   loff_t off, size_t count)
  87 {
  88         struct zpci_report_error_header *report = (void *) buf;
  89         struct device *dev = kobj_to_dev(kobj);
  90         struct pci_dev *pdev = to_pci_dev(dev);
  91         struct zpci_dev *zdev = to_zpci(pdev);
  92         int ret;
  93
  94         if (off || (count < sizeof(*report)))
  95                 return -EINVAL;
  96
  97         ret = sclp_pci_report(report, zdev->fh, zdev->fid);
  98
  99         return ret ? ret : count;
 100 }
 101 static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);
 102
 103 static struct bin_attribute *zpci_bin_attrs[] = {
 104         &bin_attr_util_string,
 105         &bin_attr_report_error,
 106         NULL,
 107 };
 108
 109 static struct attribute *zpci_dev_attrs[] = {
 110         &dev_attr_function_id.attr,
 111         &dev_attr_function_handle.attr,
 112         &dev_attr_pchid.attr,
 113         &dev_attr_pfgid.attr,
 114         &dev_attr_pft.attr,
 115         &dev_attr_vfn.attr,
 116         &dev_attr_uid.attr,
 117         &dev_attr_recover.attr,
 118         NULL,
 119 };
 120 static struct attribute_group zpci_attr_group = {
 121         .attrs = zpci_dev_attrs,
 122         .bin_attrs = zpci_bin_attrs,
 123 };
 124
 125 static struct attribute *pfip_attrs[] = {
 126         &dev_attr_segment0.attr,
 127         &dev_attr_segment1.attr,
 128         &dev_attr_segment2.attr,
 129         &dev_attr_segment3.attr,
 130         NULL,
 131 };
 132 static struct attribute_group pfip_attr_group = {
 133         .name = "pfip",
 134         .attrs = pfip_attrs,
 135 };
 136
 137 const struct attribute_group *zpci_attr_groups[] = {
 138         &zpci_attr_group,
 139         &pfip_attr_group,
 140         NULL,
 141 };