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
|
/*
* Copyright 2014 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/rcupdate.h>
#include <asm/errno.h>
#include <misc/cxl-base.h>
#include <linux/of_platform.h>
#include "cxl.h"
/* protected by rcu */
static struct cxl_calls *cxl_calls;
atomic_t cxl_use_count = ATOMIC_INIT(0);
EXPORT_SYMBOL(cxl_use_count);
#ifdef CONFIG_CXL_MODULE
static inline struct cxl_calls *cxl_calls_get(void)
{
struct cxl_calls *calls = NULL;
rcu_read_lock();
calls = rcu_dereference(cxl_calls);
if (calls && !try_module_get(calls->owner))
calls = NULL;
rcu_read_unlock();
return calls;
}
static inline void cxl_calls_put(struct cxl_calls *calls)
{
BUG_ON(calls != cxl_calls);
/* we don't need to rcu this, as we hold a reference to the module */
module_put(cxl_calls->owner);
}
#else /* !defined CONFIG_CXL_MODULE */
static inline struct cxl_calls *cxl_calls_get(void)
{
return cxl_calls;
}
static inline void cxl_calls_put(struct cxl_calls *calls) { }
#endif /* CONFIG_CXL_MODULE */
/* AFU refcount management */
struct cxl_afu *cxl_afu_get(struct cxl_afu *afu)
{
return (get_device(&afu->dev) == NULL) ? NULL : afu;
}
EXPORT_SYMBOL_GPL(cxl_afu_get);
void cxl_afu_put(struct cxl_afu *afu)
{
put_device(&afu->dev);
}
EXPORT_SYMBOL_GPL(cxl_afu_put);
void cxl_slbia(struct mm_struct *mm)
{
struct cxl_calls *calls;
calls = cxl_calls_get();
if (!calls)
return;
if (cxl_ctx_in_use())
calls->cxl_slbia(mm);
cxl_calls_put(calls);
}
int register_cxl_calls(struct cxl_calls *calls)
{
if (cxl_calls)
return -EBUSY;
rcu_assign_pointer(cxl_calls, calls);
return 0;
}
EXPORT_SYMBOL_GPL(register_cxl_calls);
void unregister_cxl_calls(struct cxl_calls *calls)
{
BUG_ON(cxl_calls->owner != calls->owner);
RCU_INIT_POINTER(cxl_calls, NULL);
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(unregister_cxl_calls);
int cxl_update_properties(struct device_node *dn,
struct property *new_prop)
{
return of_update_property(dn, new_prop);
}
EXPORT_SYMBOL_GPL(cxl_update_properties);
/*
* API calls into the driver that may be called from the PHB code and must be
* built in.
*/
bool cxl_pci_associate_default_context(struct pci_dev *dev, struct cxl_afu *afu)
{
bool ret;
struct cxl_calls *calls;
calls = cxl_calls_get();
if (!calls)
return false;
ret = calls->cxl_pci_associate_default_context(dev, afu);
cxl_calls_put(calls);
return ret;
}
EXPORT_SYMBOL_GPL(cxl_pci_associate_default_context);
void cxl_pci_disable_device(struct pci_dev *dev)
{
struct cxl_calls *calls;
calls = cxl_calls_get();
if (!calls)
return;
calls->cxl_pci_disable_device(dev);
cxl_calls_put(calls);
}
EXPORT_SYMBOL_GPL(cxl_pci_disable_device);
int cxl_next_msi_hwirq(struct pci_dev *pdev, struct cxl_context **ctx, int *afu_irq)
{
int ret;
struct cxl_calls *calls;
calls = cxl_calls_get();
if (!calls)
return -EBUSY;
ret = calls->cxl_next_msi_hwirq(pdev, ctx, afu_irq);
cxl_calls_put(calls);
return ret;
}
EXPORT_SYMBOL_GPL(cxl_next_msi_hwirq);
static int __init cxl_base_init(void)
{
struct device_node *np;
struct platform_device *dev;
int count = 0;
/*
* Scan for compatible devices in guest only
*/
if (cpu_has_feature(CPU_FTR_HVMODE))
return 0;
for_each_compatible_node(np, NULL, "ibm,coherent-platform-facility") {
dev = of_platform_device_create(np, NULL, NULL);
if (dev)
count++;
}
pr_devel("Found %d cxl device(s)\n", count);
return 0;
}
device_initcall(cxl_base_init);
|
