1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2012
*
* Author(s):
* Jan Glauber <jang@linux.vnet.ibm.com>
*/
#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/stat.h>
#include <linux/pci.h>
#include "../../../drivers/pci/pci.h"
#include <asm/sclp.h>
#define zpci_attr(name, fmt, member) \
static ssize_t name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct zpci_dev *zdev = to_zpci(to_pci_dev(dev)); \
\
return sprintf(buf, fmt, zdev->member); \
} \
static DEVICE_ATTR_RO(name)
zpci_attr(function_id, "0x%08x\n", fid);
zpci_attr(function_handle, "0x%08x\n", fh);
zpci_attr(pchid, "0x%04x\n", pchid);
zpci_attr(pfgid, "0x%02x\n", pfgid);
zpci_attr(vfn, "0x%04x\n", vfn);
zpci_attr(pft, "0x%02x\n", pft);
zpci_attr(port, "%d\n", port);
zpci_attr(uid, "0x%x\n", uid);
zpci_attr(segment0, "0x%02x\n", pfip[0]);
zpci_attr(segment1, "0x%02x\n", pfip[1]);
zpci_attr(segment2, "0x%02x\n", pfip[2]);
zpci_attr(segment3, "0x%02x\n", pfip[3]);
static ssize_t mio_enabled_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
}
static DEVICE_ATTR_RO(mio_enabled);
static int _do_recover(struct pci_dev *pdev, struct zpci_dev *zdev)
{
u8 status;
int ret;
pci_stop_and_remove_bus_device(pdev);
if (zdev_enabled(zdev)) {
ret = zpci_disable_device(zdev);
/*
* Due to a z/VM vs LPAR inconsistency in the error
* state the FH may indicate an enabled device but
* disable says the device is already disabled don't
* treat it as an error here.
*/
if (ret == -EINVAL)
ret = 0;
if (ret)
return ret;
}
ret = zpci_enable_device(zdev);
if (ret)
return ret;
if (zdev->dma_table) {
ret = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
virt_to_phys(zdev->dma_table), &status);
if (ret)
zpci_disable_device(zdev);
}
return ret;
}
static ssize_t recover_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct kernfs_node *kn;
struct pci_dev *pdev = to_pci_dev(dev);
struct zpci_dev *zdev = to_zpci(pdev);
int ret = 0;
/* Can't use device_remove_self() here as that would lead us to lock
* the pci_rescan_remove_lock while holding the device' kernfs lock.
* This would create a possible deadlock with disable_slot() which is
* not directly protected by the device' kernfs lock but takes it
* during the device removal which happens under
* pci_rescan_remove_lock.
*
* This is analogous to sdev_store_delete() in
* drivers/scsi/scsi_sysfs.c
*/
kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
WARN_ON_ONCE(!kn);
/* Device needs to be configured and state must not change */
mutex_lock(&zdev->state_lock);
if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
goto out;
/* device_remove_file() serializes concurrent calls ignoring all but
* the first
*/
device_remove_file(dev, attr);
/* A concurrent call to recover_store() may slip between
* sysfs_break_active_protection() and the sysfs file removal.
* Once it unblocks from pci_lock_rescan_remove() the original pdev
* will already be removed.
*/
pci_lock_rescan_remove();
if (pci_dev_is_added(pdev)) {
ret = _do_recover(pdev, zdev);
}
pci_rescan_bus(zdev->zbus->bus);
pci_unlock_rescan_remove();
out:
mutex_unlock(&zdev->state_lock);
if (kn)
sysfs_unbreak_active_protection(kn);
return ret ? ret : count;
}
static DEVICE_ATTR_WO(recover);
static ssize_t util_string_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
struct device *dev = kobj_to_dev(kobj);
struct pci_dev *pdev = to_pci_dev(dev);
struct zpci_dev *zdev = to_zpci(pdev);
return memory_read_from_buffer(buf, count, &off, zdev->util_str,
sizeof(zdev->util_str));
}
static BIN_ATTR_RO(util_string, CLP_UTIL_STR_LEN);
static ssize_t report_error_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
struct zpci_report_error_header *report = (void *) buf;
struct device *dev = kobj_to_dev(kobj);
struct pci_dev *pdev = to_pci_dev(dev);
struct zpci_dev *zdev = to_zpci(pdev);
int ret;
if (off || (count < sizeof(*report)))
return -EINVAL;
ret = sclp_pci_report(report, zdev->fh, zdev->fid);
return ret ? ret : count;
}
static BIN_ATTR(report_error, S_IWUSR, NULL, report_error_write, PAGE_SIZE);
static ssize_t uid_is_unique_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d\n", zpci_unique_uid ? 1 : 0);
}
static DEVICE_ATTR_RO(uid_is_unique);
/* analogous to smbios index */
static ssize_t index_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
u32 index = ~0;
if (zpci_unique_uid)
index = zdev->uid;
return sysfs_emit(buf, "%u\n", index);
}
static DEVICE_ATTR_RO(index);
static umode_t zpci_index_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
return zpci_unique_uid ? attr->mode : 0;
}
static struct attribute *zpci_ident_attrs[] = {
&dev_attr_index.attr,
NULL,
};
const struct attribute_group zpci_ident_attr_group = {
.attrs = zpci_ident_attrs,
.is_visible = zpci_index_is_visible,
};
static struct bin_attribute *zpci_bin_attrs[] = {
&bin_attr_util_string,
&bin_attr_report_error,
NULL,
};
static struct attribute *zpci_dev_attrs[] = {
&dev_attr_function_id.attr,
&dev_attr_function_handle.attr,
&dev_attr_pchid.attr,
&dev_attr_pfgid.attr,
&dev_attr_pft.attr,
&dev_attr_port.attr,
&dev_attr_vfn.attr,
&dev_attr_uid.attr,
&dev_attr_recover.attr,
&dev_attr_mio_enabled.attr,
&dev_attr_uid_is_unique.attr,
NULL,
};
const struct attribute_group zpci_attr_group = {
.attrs = zpci_dev_attrs,
.bin_attrs = zpci_bin_attrs,
};
static struct attribute *pfip_attrs[] = {
&dev_attr_segment0.attr,
&dev_attr_segment1.attr,
&dev_attr_segment2.attr,
&dev_attr_segment3.attr,
NULL,
};
const struct attribute_group pfip_attr_group = {
.name = "pfip",
.attrs = pfip_attrs,
};
|
