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 "../../../drivers/pci/pci.h"
17
18 #include <asm/sclp.h>
19
20 #define zpci_attr(name, fmt, member) \
21 static ssize_t name##_show(struct device *dev, \
22 struct device_attribute *attr, char *buf) \
23 { \
24 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); \
25 \
26 return sprintf(buf, fmt, zdev->member); \
27 } \
28 static DEVICE_ATTR_RO(name)
29
30 zpci_attr(function_id, "0x%08x\n", fid);
31 zpci_attr(function_handle, "0x%08x\n", fh);
32 zpci_attr(pchid, "0x%04x\n", pchid);
33 zpci_attr(pfgid, "0x%02x\n", pfgid);
34 zpci_attr(vfn, "0x%04x\n", vfn);
35 zpci_attr(pft, "0x%02x\n", pft);
36 zpci_attr(port, "%d\n", port);
37 zpci_attr(uid, "0x%x\n", uid);
38 zpci_attr(segment0, "0x%02x\n", pfip[0]);
39 zpci_attr(segment1, "0x%02x\n", pfip[1]);
40 zpci_attr(segment2, "0x%02x\n", pfip[2]);
41 zpci_attr(segment3, "0x%02x\n", pfip[3]);
42
mio_enabled_show(struct device * dev,struct device_attribute * attr,char * buf)43 static ssize_t mio_enabled_show(struct device *dev,
44 struct device_attribute *attr, char *buf)
45 {
46 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
47
48 return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
49 }
50 static DEVICE_ATTR_RO(mio_enabled);
51
recover_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)52 static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
53 const char *buf, size_t count)
54 {
55 struct kernfs_node *kn;
56 struct pci_dev *pdev = to_pci_dev(dev);
57 struct zpci_dev *zdev = to_zpci(pdev);
58 int ret = 0;
59
60 /* Can't use device_remove_self() here as that would lead us to lock
61 * the pci_rescan_remove_lock while holding the device' kernfs lock.
62 * This would create a possible deadlock with disable_slot() which is
63 * not directly protected by the device' kernfs lock but takes it
64 * during the device removal which happens under
65 * pci_rescan_remove_lock.
66 *
67 * This is analogous to sdev_store_delete() in
68 * drivers/scsi/scsi_sysfs.c
69 */
70 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
71 WARN_ON_ONCE(!kn);
72 /* device_remove_file() serializes concurrent calls ignoring all but
73 * the first
74 */
75 device_remove_file(dev, attr);
76
77 /* A concurrent call to recover_store() may slip between
78 * sysfs_break_active_protection() and the sysfs file removal.
79 * Once it unblocks from pci_lock_rescan_remove() the original pdev
80 * will already be removed.
81 */
82 pci_lock_rescan_remove();
83 if (pci_dev_is_added(pdev)) {
84 pci_stop_and_remove_bus_device(pdev);
85 if (zdev->dma_table) {
86 ret = zpci_dma_exit_device(zdev);
87 if (ret)
88 goto out;
89 }
90
91 if (zdev_enabled(zdev)) {
92 ret = zpci_disable_device(zdev);
93 if (ret)
94 goto out;
95 }
96
97 ret = zpci_enable_device(zdev);
98 if (ret)
99 goto out;
100 ret = zpci_dma_init_device(zdev);
101 if (ret) {
102 zpci_disable_device(zdev);
103 goto out;
104 }
105 pci_rescan_bus(zdev->zbus->bus);
106 }
107 out:
108 pci_unlock_rescan_remove();
109 if (kn)
110 sysfs_unbreak_active_protection(kn);
111 return ret ? ret : count;
112 }
113 static DEVICE_ATTR_WO(recover);
114
util_string_read(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)115 static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
116 struct bin_attribute *attr, char *buf,
117 loff_t off, size_t count)
118 {
119 struct device *dev = kobj_to_dev(kobj);
120 struct pci_dev *pdev = to_pci_dev(dev);
121 struct zpci_dev *zdev = to_zpci(pdev);
122
123 return memory_read_from_buffer(buf, count, &off, zdev->util_str,
124 sizeof(zdev->util_str));
125 }
126 static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
127
report_error_write(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)128 static ssize_t report_error_write(struct file *filp, struct kobject *kobj,
129 struct bin_attribute *attr, char *buf,
130 loff_t off, size_t count)
131 {
132 struct zpci_report_error_header *report = (void *) buf;
133 struct device *dev = kobj_to_dev(kobj);
134 struct pci_dev *pdev = to_pci_dev(dev);
135 struct zpci_dev *zdev = to_zpci(pdev);
136 int ret;
137
138 if (off || (count < sizeof(*report)))
139 return -EINVAL;
140
141 ret = sclp_pci_report(report, zdev->fh, zdev->fid);
142
143 return ret ? ret : count;
144 }
145 static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);
146
uid_is_unique_show(struct device * dev,struct device_attribute * attr,char * buf)147 static ssize_t uid_is_unique_show(struct device *dev,
148 struct device_attribute *attr, char *buf)
149 {
150 return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0);
151 }
152 static DEVICE_ATTR_RO(uid_is_unique);
153
154 #ifndef CONFIG_DMI
155 /* analogous to smbios index */
index_show(struct device * dev,struct device_attribute * attr,char * buf)156 static ssize_t index_show(struct device *dev,
157 struct device_attribute *attr, char *buf)
158 {
159 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
160 u32 index = ~0;
161
162 if (zpci_unique_uid)
163 index = zdev->uid;
164
165 return sysfs_emit(buf, "%u\n", index);
166 }
167 static DEVICE_ATTR_RO(index);
168
zpci_index_is_visible(struct kobject * kobj,struct attribute * attr,int n)169 static umode_t zpci_index_is_visible(struct kobject *kobj,
170 struct attribute *attr, int n)
171 {
172 return zpci_unique_uid ? attr->mode : 0;
173 }
174
175 static struct attribute *zpci_ident_attrs[] = {
176 &dev_attr_index.attr,
177 NULL,
178 };
179
180 static struct attribute_group zpci_ident_attr_group = {
181 .attrs = zpci_ident_attrs,
182 .is_visible = zpci_index_is_visible,
183 };
184 #endif
185
186 static struct bin_attribute *zpci_bin_attrs[] = {
187 &bin_attr_util_string,
188 &bin_attr_report_error,
189 NULL,
190 };
191
192 static struct attribute *zpci_dev_attrs[] = {
193 &dev_attr_function_id.attr,
194 &dev_attr_function_handle.attr,
195 &dev_attr_pchid.attr,
196 &dev_attr_pfgid.attr,
197 &dev_attr_pft.attr,
198 &dev_attr_port.attr,
199 &dev_attr_vfn.attr,
200 &dev_attr_uid.attr,
201 &dev_attr_recover.attr,
202 &dev_attr_mio_enabled.attr,
203 &dev_attr_uid_is_unique.attr,
204 NULL,
205 };
206
207 static struct attribute_group zpci_attr_group = {
208 .attrs = zpci_dev_attrs,
209 .bin_attrs = zpci_bin_attrs,
210 };
211
212 static struct attribute *pfip_attrs[] = {
213 &dev_attr_segment0.attr,
214 &dev_attr_segment1.attr,
215 &dev_attr_segment2.attr,
216 &dev_attr_segment3.attr,
217 NULL,
218 };
219 static struct attribute_group pfip_attr_group = {
220 .name = "pfip",
221 .attrs = pfip_attrs,
222 };
223
224 const struct attribute_group *zpci_attr_groups[] = {
225 &zpci_attr_group,
226 &pfip_attr_group,
227 #ifndef CONFIG_DMI
228 &zpci_ident_attr_group,
229 #endif
230 NULL,
231 };
232