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1/* hvapi.c: Hypervisor API management.
2 *
3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
4 */
5#include <linux/kernel.h>
6#include <linux/export.h>
7#include <linux/init.h>
8
9#include <asm/hypervisor.h>
10#include <asm/oplib.h>
11
12/* If the hypervisor indicates that the API setting
13 * calls are unsupported, by returning HV_EBADTRAP or
14 * HV_ENOTSUPPORTED, we assume that API groups with the
15 * PRE_API flag set are major 1 minor 0.
16 */
17struct api_info {
18 unsigned long group;
19 unsigned long major;
20 unsigned long minor;
21 unsigned int refcnt;
22 unsigned int flags;
23#define FLAG_PRE_API 0x00000001
24};
25
26static struct api_info api_table[] = {
27 { .group = HV_GRP_SUN4V, .flags = FLAG_PRE_API },
28 { .group = HV_GRP_CORE, .flags = FLAG_PRE_API },
29 { .group = HV_GRP_INTR, },
30 { .group = HV_GRP_SOFT_STATE, },
31 { .group = HV_GRP_TM, },
32 { .group = HV_GRP_PCI, .flags = FLAG_PRE_API },
33 { .group = HV_GRP_LDOM, },
34 { .group = HV_GRP_SVC_CHAN, .flags = FLAG_PRE_API },
35 { .group = HV_GRP_NCS, .flags = FLAG_PRE_API },
36 { .group = HV_GRP_RNG, },
37 { .group = HV_GRP_PBOOT, },
38 { .group = HV_GRP_TPM, },
39 { .group = HV_GRP_SDIO, },
40 { .group = HV_GRP_SDIO_ERR, },
41 { .group = HV_GRP_REBOOT_DATA, },
42 { .group = HV_GRP_NIAG_PERF, .flags = FLAG_PRE_API },
43 { .group = HV_GRP_FIRE_PERF, },
44 { .group = HV_GRP_N2_CPU, },
45 { .group = HV_GRP_NIU, },
46 { .group = HV_GRP_VF_CPU, },
47 { .group = HV_GRP_KT_CPU, },
48 { .group = HV_GRP_DIAG, .flags = FLAG_PRE_API },
49};
50
51static DEFINE_SPINLOCK(hvapi_lock);
52
53static struct api_info *__get_info(unsigned long group)
54{
55 int i;
56
57 for (i = 0; i < ARRAY_SIZE(api_table); i++) {
58 if (api_table[i].group == group)
59 return &api_table[i];
60 }
61 return NULL;
62}
63
64static void __get_ref(struct api_info *p)
65{
66 p->refcnt++;
67}
68
69static void __put_ref(struct api_info *p)
70{
71 if (--p->refcnt == 0) {
72 unsigned long ignore;
73
74 sun4v_set_version(p->group, 0, 0, &ignore);
75 p->major = p->minor = 0;
76 }
77}
78
79/* Register a hypervisor API specification. It indicates the
80 * API group and desired major+minor.
81 *
82 * If an existing API registration exists '0' (success) will
83 * be returned if it is compatible with the one being registered.
84 * Otherwise a negative error code will be returned.
85 *
86 * Otherwise an attempt will be made to negotiate the requested
87 * API group/major/minor with the hypervisor, and errors returned
88 * if that does not succeed.
89 */
90int sun4v_hvapi_register(unsigned long group, unsigned long major,
91 unsigned long *minor)
92{
93 struct api_info *p;
94 unsigned long flags;
95 int ret;
96
97 spin_lock_irqsave(&hvapi_lock, flags);
98 p = __get_info(group);
99 ret = -EINVAL;
100 if (p) {
101 if (p->refcnt) {
102 ret = -EINVAL;
103 if (p->major == major) {
104 *minor = p->minor;
105 ret = 0;
106 }
107 } else {
108 unsigned long actual_minor;
109 unsigned long hv_ret;
110
111 hv_ret = sun4v_set_version(group, major, *minor,
112 &actual_minor);
113 ret = -EINVAL;
114 if (hv_ret == HV_EOK) {
115 *minor = actual_minor;
116 p->major = major;
117 p->minor = actual_minor;
118 ret = 0;
119 } else if (hv_ret == HV_EBADTRAP ||
120 hv_ret == HV_ENOTSUPPORTED) {
121 if (p->flags & FLAG_PRE_API) {
122 if (major == 1) {
123 p->major = 1;
124 p->minor = 0;
125 *minor = 0;
126 ret = 0;
127 }
128 }
129 }
130 }
131
132 if (ret == 0)
133 __get_ref(p);
134 }
135 spin_unlock_irqrestore(&hvapi_lock, flags);
136
137 return ret;
138}
139EXPORT_SYMBOL(sun4v_hvapi_register);
140
141void sun4v_hvapi_unregister(unsigned long group)
142{
143 struct api_info *p;
144 unsigned long flags;
145
146 spin_lock_irqsave(&hvapi_lock, flags);
147 p = __get_info(group);
148 if (p)
149 __put_ref(p);
150 spin_unlock_irqrestore(&hvapi_lock, flags);
151}
152EXPORT_SYMBOL(sun4v_hvapi_unregister);
153
154int sun4v_hvapi_get(unsigned long group,
155 unsigned long *major,
156 unsigned long *minor)
157{
158 struct api_info *p;
159 unsigned long flags;
160 int ret;
161
162 spin_lock_irqsave(&hvapi_lock, flags);
163 ret = -EINVAL;
164 p = __get_info(group);
165 if (p && p->refcnt) {
166 *major = p->major;
167 *minor = p->minor;
168 ret = 0;
169 }
170 spin_unlock_irqrestore(&hvapi_lock, flags);
171
172 return ret;
173}
174EXPORT_SYMBOL(sun4v_hvapi_get);
175
176void __init sun4v_hvapi_init(void)
177{
178 unsigned long group, major, minor;
179
180 group = HV_GRP_SUN4V;
181 major = 1;
182 minor = 0;
183 if (sun4v_hvapi_register(group, major, &minor))
184 goto bad;
185
186 group = HV_GRP_CORE;
187 major = 1;
188 minor = 1;
189 if (sun4v_hvapi_register(group, major, &minor))
190 goto bad;
191
192 return;
193
194bad:
195 prom_printf("HVAPI: Cannot register API group "
196 "%lx with major(%u) minor(%u)\n",
197 group, major, minor);
198 prom_halt();
199}
1/* hvapi.c: Hypervisor API management.
2 *
3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
4 */
5#include <linux/kernel.h>
6#include <linux/export.h>
7#include <linux/init.h>
8
9#include <asm/hypervisor.h>
10#include <asm/oplib.h>
11
12/* If the hypervisor indicates that the API setting
13 * calls are unsupported, by returning HV_EBADTRAP or
14 * HV_ENOTSUPPORTED, we assume that API groups with the
15 * PRE_API flag set are major 1 minor 0.
16 */
17struct api_info {
18 unsigned long group;
19 unsigned long major;
20 unsigned long minor;
21 unsigned int refcnt;
22 unsigned int flags;
23#define FLAG_PRE_API 0x00000001
24};
25
26static struct api_info api_table[] = {
27 { .group = HV_GRP_SUN4V, .flags = FLAG_PRE_API },
28 { .group = HV_GRP_CORE, .flags = FLAG_PRE_API },
29 { .group = HV_GRP_INTR, },
30 { .group = HV_GRP_SOFT_STATE, },
31 { .group = HV_GRP_TM, },
32 { .group = HV_GRP_PCI, .flags = FLAG_PRE_API },
33 { .group = HV_GRP_LDOM, },
34 { .group = HV_GRP_SVC_CHAN, .flags = FLAG_PRE_API },
35 { .group = HV_GRP_NCS, .flags = FLAG_PRE_API },
36 { .group = HV_GRP_RNG, },
37 { .group = HV_GRP_PBOOT, },
38 { .group = HV_GRP_TPM, },
39 { .group = HV_GRP_SDIO, },
40 { .group = HV_GRP_SDIO_ERR, },
41 { .group = HV_GRP_REBOOT_DATA, },
42 { .group = HV_GRP_NIAG_PERF, .flags = FLAG_PRE_API },
43 { .group = HV_GRP_FIRE_PERF, },
44 { .group = HV_GRP_N2_CPU, },
45 { .group = HV_GRP_NIU, },
46 { .group = HV_GRP_VF_CPU, },
47 { .group = HV_GRP_KT_CPU, },
48 { .group = HV_GRP_VT_CPU, },
49 { .group = HV_GRP_DIAG, .flags = FLAG_PRE_API },
50};
51
52static DEFINE_SPINLOCK(hvapi_lock);
53
54static struct api_info *__get_info(unsigned long group)
55{
56 int i;
57
58 for (i = 0; i < ARRAY_SIZE(api_table); i++) {
59 if (api_table[i].group == group)
60 return &api_table[i];
61 }
62 return NULL;
63}
64
65static void __get_ref(struct api_info *p)
66{
67 p->refcnt++;
68}
69
70static void __put_ref(struct api_info *p)
71{
72 if (--p->refcnt == 0) {
73 unsigned long ignore;
74
75 sun4v_set_version(p->group, 0, 0, &ignore);
76 p->major = p->minor = 0;
77 }
78}
79
80/* Register a hypervisor API specification. It indicates the
81 * API group and desired major+minor.
82 *
83 * If an existing API registration exists '0' (success) will
84 * be returned if it is compatible with the one being registered.
85 * Otherwise a negative error code will be returned.
86 *
87 * Otherwise an attempt will be made to negotiate the requested
88 * API group/major/minor with the hypervisor, and errors returned
89 * if that does not succeed.
90 */
91int sun4v_hvapi_register(unsigned long group, unsigned long major,
92 unsigned long *minor)
93{
94 struct api_info *p;
95 unsigned long flags;
96 int ret;
97
98 spin_lock_irqsave(&hvapi_lock, flags);
99 p = __get_info(group);
100 ret = -EINVAL;
101 if (p) {
102 if (p->refcnt) {
103 ret = -EINVAL;
104 if (p->major == major) {
105 *minor = p->minor;
106 ret = 0;
107 }
108 } else {
109 unsigned long actual_minor;
110 unsigned long hv_ret;
111
112 hv_ret = sun4v_set_version(group, major, *minor,
113 &actual_minor);
114 ret = -EINVAL;
115 if (hv_ret == HV_EOK) {
116 *minor = actual_minor;
117 p->major = major;
118 p->minor = actual_minor;
119 ret = 0;
120 } else if (hv_ret == HV_EBADTRAP ||
121 hv_ret == HV_ENOTSUPPORTED) {
122 if (p->flags & FLAG_PRE_API) {
123 if (major == 1) {
124 p->major = 1;
125 p->minor = 0;
126 *minor = 0;
127 ret = 0;
128 }
129 }
130 }
131 }
132
133 if (ret == 0)
134 __get_ref(p);
135 }
136 spin_unlock_irqrestore(&hvapi_lock, flags);
137
138 return ret;
139}
140EXPORT_SYMBOL(sun4v_hvapi_register);
141
142void sun4v_hvapi_unregister(unsigned long group)
143{
144 struct api_info *p;
145 unsigned long flags;
146
147 spin_lock_irqsave(&hvapi_lock, flags);
148 p = __get_info(group);
149 if (p)
150 __put_ref(p);
151 spin_unlock_irqrestore(&hvapi_lock, flags);
152}
153EXPORT_SYMBOL(sun4v_hvapi_unregister);
154
155int sun4v_hvapi_get(unsigned long group,
156 unsigned long *major,
157 unsigned long *minor)
158{
159 struct api_info *p;
160 unsigned long flags;
161 int ret;
162
163 spin_lock_irqsave(&hvapi_lock, flags);
164 ret = -EINVAL;
165 p = __get_info(group);
166 if (p && p->refcnt) {
167 *major = p->major;
168 *minor = p->minor;
169 ret = 0;
170 }
171 spin_unlock_irqrestore(&hvapi_lock, flags);
172
173 return ret;
174}
175EXPORT_SYMBOL(sun4v_hvapi_get);
176
177void __init sun4v_hvapi_init(void)
178{
179 unsigned long group, major, minor;
180
181 group = HV_GRP_SUN4V;
182 major = 1;
183 minor = 0;
184 if (sun4v_hvapi_register(group, major, &minor))
185 goto bad;
186
187 group = HV_GRP_CORE;
188 major = 1;
189 minor = 1;
190 if (sun4v_hvapi_register(group, major, &minor))
191 goto bad;
192
193 return;
194
195bad:
196 prom_printf("HVAPI: Cannot register API group "
197 "%lx with major(%lu) minor(%lu)\n",
198 group, major, minor);
199 prom_halt();
200}