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 mio_enabled_show(struct device *dev,
  41                                 struct device_attribute *attr, char *buf)
  42 {
  43         struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
  44
  45         return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
  46 }
  47 static DEVICE_ATTR_RO(mio_enabled);
  48
  49 static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
  50                              const char *buf, size_t count)
  51 {
  52         struct pci_dev *pdev = to_pci_dev(dev);
  53         struct zpci_dev *zdev = to_zpci(pdev);
  54         int ret;
  55
  56         if (!device_remove_file_self(dev, attr))
  57                 return count;
  58
  59         pci_lock_rescan_remove();
  60         pci_stop_and_remove_bus_device(pdev);
  61         ret = zpci_disable_device(zdev);
  62         if (ret)
  63                 goto error;
  64
  65         ret = zpci_enable_device(zdev);
  66         if (ret)
  67                 goto error;
  68
  69         pci_rescan_bus(zdev->bus);
  70         pci_unlock_rescan_remove();
  71
  72         return count;
  73
  74 error:
  75         pci_unlock_rescan_remove();
  76         return ret;
  77 }
  78 static DEVICE_ATTR_WO(recover);
  79
  80 static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
  81                                 struct bin_attribute *attr, char *buf,
  82                                 loff_t off, size_t count)
  83 {
  84         struct device *dev = kobj_to_dev(kobj);
  85         struct pci_dev *pdev = to_pci_dev(dev);
  86         struct zpci_dev *zdev = to_zpci(pdev);
  87
  88         return memory_read_from_buffer(buf, count, &off, zdev->util_str,
  89                                        sizeof(zdev->util_str));
  90 }
  91 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
  92
  93 static ssize_t report_error_write(struct file *filp, struct kobject *kobj,
  94                                   struct bin_attribute *attr, char *buf,
  95                                   loff_t off, size_t count)
  96 {
  97         struct zpci_report_error_header *report = (void *) buf;
  98         struct device *dev = kobj_to_dev(kobj);
  99         struct pci_dev *pdev = to_pci_dev(dev);
 100         struct zpci_dev *zdev = to_zpci(pdev);
 101         int ret;
 102
 103         if (off || (count < sizeof(*report)))
 104                 return -EINVAL;
 105
 106         ret = sclp_pci_report(report, zdev->fh, zdev->fid);
 107
 108         return ret ? ret : count;
 109 }
 110 static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);
 111
 112 static struct bin_attribute *zpci_bin_attrs[] = {
 113         &bin_attr_util_string,
 114         &bin_attr_report_error,
 115         NULL,
 116 };
 117
 118 static struct attribute *zpci_dev_attrs[] = {
 119         &dev_attr_function_id.attr,
 120         &dev_attr_function_handle.attr,
 121         &dev_attr_pchid.attr,
 122         &dev_attr_pfgid.attr,
 123         &dev_attr_pft.attr,
 124         &dev_attr_vfn.attr,
 125         &dev_attr_uid.attr,
 126         &dev_attr_recover.attr,
 127         &dev_attr_mio_enabled.attr,
 128         NULL,
 129 };
 130 static struct attribute_group zpci_attr_group = {
 131         .attrs = zpci_dev_attrs,
 132         .bin_attrs = zpci_bin_attrs,
 133 };
 134
 135 static struct attribute *pfip_attrs[] = {
 136         &dev_attr_segment0.attr,
 137         &dev_attr_segment1.attr,
 138         &dev_attr_segment2.attr,
 139         &dev_attr_segment3.attr,
 140         NULL,
 141 };
 142 static struct attribute_group pfip_attr_group = {
 143         .name = "pfip",
 144         .attrs = pfip_attrs,
 145 };
 146
 147 const struct attribute_group *zpci_attr_groups[] = {
 148         &zpci_attr_group,
 149         &pfip_attr_group,
 150         NULL,
 151 };