1 /* hvapi.c: Hypervisor API management.
3 * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
5 #include <linux/kernel.h>
6 #include <linux/module.h>
7 #include <linux/init.h>
9 #include <asm/hypervisor.h>
10 #include <asm/oplib.h>
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.
23 #define FLAG_PRE_API 0x00000001
26 static 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_PCI, .flags = FLAG_PRE_API },
32 { .group = HV_GRP_LDOM, },
33 { .group = HV_GRP_SVC_CHAN, .flags = FLAG_PRE_API },
34 { .group = HV_GRP_NCS, .flags = FLAG_PRE_API },
35 { .group = HV_GRP_RNG, },
36 { .group = HV_GRP_NIAG_PERF, .flags = FLAG_PRE_API },
37 { .group = HV_GRP_FIRE_PERF, },
38 { .group = HV_GRP_N2_CPU, },
39 { .group = HV_GRP_NIU, },
40 { .group = HV_GRP_VF_CPU, },
41 { .group = HV_GRP_DIAG, .flags = FLAG_PRE_API },
44 static DEFINE_SPINLOCK(hvapi_lock);
46 static struct api_info *__get_info(unsigned long group)
50 for (i = 0; i < ARRAY_SIZE(api_table); i++) {
51 if (api_table[i].group == group)
57 static void __get_ref(struct api_info *p)
62 static void __put_ref(struct api_info *p)
64 if (--p->refcnt == 0) {
67 sun4v_set_version(p->group, 0, 0, &ignore);
68 p->major = p->minor = 0;
72 /* Register a hypervisor API specification. It indicates the
73 * API group and desired major+minor.
75 * If an existing API registration exists '0' (success) will
76 * be returned if it is compatible with the one being registered.
77 * Otherwise a negative error code will be returned.
79 * Otherwise an attempt will be made to negotiate the requested
80 * API group/major/minor with the hypervisor, and errors returned
81 * if that does not succeed.
83 int sun4v_hvapi_register(unsigned long group, unsigned long major,
90 spin_lock_irqsave(&hvapi_lock, flags);
91 p = __get_info(group);
96 if (p->major == major) {
101 unsigned long actual_minor;
102 unsigned long hv_ret;
104 hv_ret = sun4v_set_version(group, major, *minor,
107 if (hv_ret == HV_EOK) {
108 *minor = actual_minor;
110 p->minor = actual_minor;
112 } else if (hv_ret == HV_EBADTRAP ||
113 hv_ret == HV_ENOTSUPPORTED) {
114 if (p->flags & FLAG_PRE_API) {
128 spin_unlock_irqrestore(&hvapi_lock, flags);
132 EXPORT_SYMBOL(sun4v_hvapi_register);
134 void sun4v_hvapi_unregister(unsigned long group)
139 spin_lock_irqsave(&hvapi_lock, flags);
140 p = __get_info(group);
143 spin_unlock_irqrestore(&hvapi_lock, flags);
145 EXPORT_SYMBOL(sun4v_hvapi_unregister);
147 int sun4v_hvapi_get(unsigned long group,
148 unsigned long *major,
149 unsigned long *minor)
155 spin_lock_irqsave(&hvapi_lock, flags);
157 p = __get_info(group);
158 if (p && p->refcnt) {
163 spin_unlock_irqrestore(&hvapi_lock, flags);
167 EXPORT_SYMBOL(sun4v_hvapi_get);
169 void __init sun4v_hvapi_init(void)
171 unsigned long group, major, minor;
173 group = HV_GRP_SUN4V;
176 if (sun4v_hvapi_register(group, major, &minor))
182 if (sun4v_hvapi_register(group, major, &minor))
188 prom_printf("HVAPI: Cannot register API group "
189 "%lx with major(%u) minor(%u)\n",
190 group, major, minor);