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 pr_fmt(fmt) "zpci: " fmt
10
11 #include <linux/kernel.h>
12 #include <linux/stat.h>
13 #include <linux/pci.h>
14
15 #include "../../../drivers/pci/pci.h"
16
17 #include <asm/sclp.h>
18
19 #define zpci_attr(name, fmt, member) \
20 static ssize_t name##_show(struct device *dev, \
21 struct device_attribute *attr, char *buf) \
22 { \
23 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); \
24 \
25 return sysfs_emit(buf, fmt, zdev->member); \
26 } \
27 static DEVICE_ATTR_RO(name)
28
29 zpci_attr(function_id, "0x%08x\n", fid);
30 zpci_attr(function_handle, "0x%08x\n", fh);
31 zpci_attr(pchid, "0x%04x\n", pchid);
32 zpci_attr(pfgid, "0x%02x\n", pfgid);
33 zpci_attr(vfn, "0x%04x\n", vfn);
34 zpci_attr(pft, "0x%02x\n", pft);
35 zpci_attr(port, "%d\n", port);
36 zpci_attr(fidparm, "0x%02x\n", fidparm);
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
43 #define ZPCI_FW_ATTR_RO(_name) \
44 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
45
mio_enabled_show(struct device * dev,struct device_attribute * attr,char * buf)46 static ssize_t mio_enabled_show(struct device *dev,
47 struct device_attribute *attr, char *buf)
48 {
49 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
50
51 return sysfs_emit(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
52 }
53 static DEVICE_ATTR_RO(mio_enabled);
54
_do_recover(struct pci_dev * pdev,struct zpci_dev * zdev)55 static int _do_recover(struct pci_dev *pdev, struct zpci_dev *zdev)
56 {
57 int ret;
58
59 pci_stop_and_remove_bus_device(pdev);
60 if (zdev_enabled(zdev)) {
61 ret = zpci_disable_device(zdev);
62 /*
63 * Due to a z/VM vs LPAR inconsistency in the error
64 * state the FH may indicate an enabled device but
65 * disable says the device is already disabled don't
66 * treat it as an error here.
67 */
68 if (ret == -EINVAL)
69 ret = 0;
70 if (ret)
71 return ret;
72 }
73
74 ret = zpci_reenable_device(zdev);
75
76 return ret;
77 }
78
recover_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)79 static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
80 const char *buf, size_t count)
81 {
82 struct kernfs_node *kn;
83 struct pci_dev *pdev = to_pci_dev(dev);
84 struct zpci_dev *zdev = to_zpci(pdev);
85 int ret = 0;
86
87 /* Can't use device_remove_self() here as that would lead us to lock
88 * the pci_rescan_remove_lock while holding the device' kernfs lock.
89 * This would create a possible deadlock with disable_slot() which is
90 * not directly protected by the device' kernfs lock but takes it
91 * during the device removal which happens under
92 * pci_rescan_remove_lock.
93 *
94 * This is analogous to sdev_store_delete() in
95 * drivers/scsi/scsi_sysfs.c
96 */
97 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
98 WARN_ON_ONCE(!kn);
99
100 /* Device needs to be configured and state must not change */
101 mutex_lock(&zdev->state_lock);
102 if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
103 goto out;
104
105 /* device_remove_file() serializes concurrent calls ignoring all but
106 * the first
107 */
108 device_remove_file(dev, attr);
109
110 /* A concurrent call to recover_store() may slip between
111 * sysfs_break_active_protection() and the sysfs file removal.
112 * Once it unblocks from pci_lock_rescan_remove() the original pdev
113 * will already be removed.
114 */
115 pci_lock_rescan_remove();
116 if (pci_dev_is_added(pdev)) {
117 ret = _do_recover(pdev, zdev);
118 }
119 pci_rescan_bus(zdev->zbus->bus);
120 pci_unlock_rescan_remove();
121
122 out:
123 mutex_unlock(&zdev->state_lock);
124 if (kn)
125 sysfs_unbreak_active_protection(kn);
126 return ret ? ret : count;
127 }
128 static DEVICE_ATTR_WO(recover);
129
util_string_read(struct file * filp,struct kobject * kobj,const struct bin_attribute * attr,char * buf,loff_t off,size_t count)130 static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
131 const struct bin_attribute *attr, char *buf,
132 loff_t off, size_t count)
133 {
134 struct device *dev = kobj_to_dev(kobj);
135 struct pci_dev *pdev = to_pci_dev(dev);
136 struct zpci_dev *zdev = to_zpci(pdev);
137
138 return memory_read_from_buffer(buf, count, &off, zdev->util_str,
139 sizeof(zdev->util_str));
140 }
141 static const BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
142
report_error_write(struct file * filp,struct kobject * kobj,const struct bin_attribute * attr,char * buf,loff_t off,size_t count)143 static ssize_t report_error_write(struct file *filp, struct kobject *kobj,
144 const struct bin_attribute *attr, char *buf,
145 loff_t off, size_t count)
146 {
147 struct zpci_report_error_header *report = (void *) buf;
148 struct device *dev = kobj_to_dev(kobj);
149 struct pci_dev *pdev = to_pci_dev(dev);
150 struct zpci_dev *zdev = to_zpci(pdev);
151 int ret;
152
153 if (off || (count < sizeof(*report)))
154 return -EINVAL;
155
156 if (count < (report->length + sizeof(*report)))
157 return -EINVAL;
158
159 ret = sclp_pci_report(report, zdev->fh, zdev->fid);
160
161 return ret ? ret : count;
162 }
163 static const BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);
164
uid_is_unique_show(struct device * dev,struct device_attribute * attr,char * buf)165 static ssize_t uid_is_unique_show(struct device *dev,
166 struct device_attribute *attr, char *buf)
167 {
168 return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0);
169 }
170 static DEVICE_ATTR_RO(uid_is_unique);
171
uid_checking_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)172 static ssize_t uid_checking_show(struct kobject *kobj,
173 struct kobj_attribute *attr, char *buf)
174 {
175 return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0);
176 }
177 ZPCI_FW_ATTR_RO(uid_checking);
178
179 /* analogous to smbios index */
index_show(struct device * dev,struct device_attribute * attr,char * buf)180 static ssize_t index_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
182 {
183 struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
184 u32 index = ~0;
185
186 if (zpci_unique_uid)
187 index = zdev->uid;
188
189 return sysfs_emit(buf, "%u\n", index);
190 }
191 static DEVICE_ATTR_RO(index);
192
zpci_uid_slot_show(struct pci_slot * slot,char * buf)193 static ssize_t zpci_uid_slot_show(struct pci_slot *slot, char *buf)
194 {
195 struct zpci_dev *zdev = container_of(slot->hotplug, struct zpci_dev,
196 hotplug_slot);
197
198 return sysfs_emit(buf, "0x%x\n", zdev->uid);
199 }
200
201 static struct pci_slot_attribute zpci_slot_attr_uid =
202 __ATTR(uid, 0444, zpci_uid_slot_show, NULL);
203
zpci_index_is_visible(struct kobject * kobj,struct attribute * attr,int n)204 static umode_t zpci_index_is_visible(struct kobject *kobj,
205 struct attribute *attr, int n)
206 {
207 return zpci_unique_uid ? attr->mode : 0;
208 }
209
210 static struct attribute *zpci_ident_attrs[] = {
211 &dev_attr_index.attr,
212 NULL,
213 };
214
215 const struct attribute_group zpci_ident_attr_group = {
216 .attrs = zpci_ident_attrs,
217 .is_visible = zpci_index_is_visible,
218 };
219
220 static const struct bin_attribute *const zpci_bin_attrs[] = {
221 &bin_attr_util_string,
222 &bin_attr_report_error,
223 NULL,
224 };
225
226 static struct attribute *zpci_dev_attrs[] = {
227 &dev_attr_function_id.attr,
228 &dev_attr_function_handle.attr,
229 &dev_attr_pchid.attr,
230 &dev_attr_pfgid.attr,
231 &dev_attr_pft.attr,
232 &dev_attr_port.attr,
233 &dev_attr_fidparm.attr,
234 &dev_attr_vfn.attr,
235 &dev_attr_uid.attr,
236 &dev_attr_recover.attr,
237 &dev_attr_mio_enabled.attr,
238 &dev_attr_uid_is_unique.attr,
239 NULL,
240 };
241
242 const struct attribute_group zpci_attr_group = {
243 .attrs = zpci_dev_attrs,
244 .bin_attrs = zpci_bin_attrs,
245 };
246
247 static struct attribute *pfip_attrs[] = {
248 &dev_attr_segment0.attr,
249 &dev_attr_segment1.attr,
250 &dev_attr_segment2.attr,
251 &dev_attr_segment3.attr,
252 NULL,
253 };
254
255 const struct attribute_group pfip_attr_group = {
256 .name = "pfip",
257 .attrs = pfip_attrs,
258 };
259
260 static struct attribute *zpci_slot_attrs[] = {
261 &zpci_slot_attr_uid.attr,
262 NULL,
263 };
264
265 const struct attribute_group zpci_slot_attr_group = {
266 .attrs = zpci_slot_attrs,
267 };
268
269 static struct attribute *clp_fw_attrs[] = {
270 &uid_checking_attr.attr,
271 NULL,
272 };
273
274 static struct attribute_group clp_fw_attr_group = {
275 .name = "clp",
276 .attrs = clp_fw_attrs,
277 };
278
__zpci_fw_sysfs_init(void)279 int __init __zpci_fw_sysfs_init(void)
280 {
281 return sysfs_create_group(firmware_kobj, &clp_fw_attr_group);
282 }
283