~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/sparc/kernel/hvapi.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.76 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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  */
 17 struct 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 
 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_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_T5_CPU,                               },
 50         { .group = HV_GRP_DIAG,         .flags = FLAG_PRE_API   },
 51         { .group = HV_GRP_M7_PERF,                              },
 52 };
 53 
 54 static DEFINE_SPINLOCK(hvapi_lock);
 55 
 56 static struct api_info *__get_info(unsigned long group)
 57 {
 58         int i;
 59 
 60         for (i = 0; i < ARRAY_SIZE(api_table); i++) {
 61                 if (api_table[i].group == group)
 62                         return &api_table[i];
 63         }
 64         return NULL;
 65 }
 66 
 67 static void __get_ref(struct api_info *p)
 68 {
 69         p->refcnt++;
 70 }
 71 
 72 static void __put_ref(struct api_info *p)
 73 {
 74         if (--p->refcnt == 0) {
 75                 unsigned long ignore;
 76 
 77                 sun4v_set_version(p->group, 0, 0, &ignore);
 78                 p->major = p->minor = 0;
 79         }
 80 }
 81 
 82 /* Register a hypervisor API specification.  It indicates the
 83  * API group and desired major+minor.
 84  *
 85  * If an existing API registration exists '' (success) will
 86  * be returned if it is compatible with the one being registered.
 87  * Otherwise a negative error code will be returned.
 88  *
 89  * Otherwise an attempt will be made to negotiate the requested
 90  * API group/major/minor with the hypervisor, and errors returned
 91  * if that does not succeed.
 92  */
 93 int sun4v_hvapi_register(unsigned long group, unsigned long major,
 94                          unsigned long *minor)
 95 {
 96         struct api_info *p;
 97         unsigned long flags;
 98         int ret;
 99 
100         spin_lock_irqsave(&hvapi_lock, flags);
101         p = __get_info(group);
102         ret = -EINVAL;
103         if (p) {
104                 if (p->refcnt) {
105                         ret = -EINVAL;
106                         if (p->major == major) {
107                                 *minor = p->minor;
108                                 ret = 0;
109                         }
110                 } else {
111                         unsigned long actual_minor;
112                         unsigned long hv_ret;
113 
114                         hv_ret = sun4v_set_version(group, major, *minor,
115                                                    &actual_minor);
116                         ret = -EINVAL;
117                         if (hv_ret == HV_EOK) {
118                                 *minor = actual_minor;
119                                 p->major = major;
120                                 p->minor = actual_minor;
121                                 ret = 0;
122                         } else if (hv_ret == HV_EBADTRAP ||
123                                    hv_ret == HV_ENOTSUPPORTED) {
124                                 if (p->flags & FLAG_PRE_API) {
125                                         if (major == 1) {
126                                                 p->major = 1;
127                                                 p->minor = 0;
128                                                 *minor = 0;
129                                                 ret = 0;
130                                         }
131                                 }
132                         }
133                 }
134 
135                 if (ret == 0)
136                         __get_ref(p);
137         }
138         spin_unlock_irqrestore(&hvapi_lock, flags);
139 
140         return ret;
141 }
142 EXPORT_SYMBOL(sun4v_hvapi_register);
143 
144 void sun4v_hvapi_unregister(unsigned long group)
145 {
146         struct api_info *p;
147         unsigned long flags;
148 
149         spin_lock_irqsave(&hvapi_lock, flags);
150         p = __get_info(group);
151         if (p)
152                 __put_ref(p);
153         spin_unlock_irqrestore(&hvapi_lock, flags);
154 }
155 EXPORT_SYMBOL(sun4v_hvapi_unregister);
156 
157 int sun4v_hvapi_get(unsigned long group,
158                     unsigned long *major,
159                     unsigned long *minor)
160 {
161         struct api_info *p;
162         unsigned long flags;
163         int ret;
164 
165         spin_lock_irqsave(&hvapi_lock, flags);
166         ret = -EINVAL;
167         p = __get_info(group);
168         if (p && p->refcnt) {
169                 *major = p->major;
170                 *minor = p->minor;
171                 ret = 0;
172         }
173         spin_unlock_irqrestore(&hvapi_lock, flags);
174 
175         return ret;
176 }
177 EXPORT_SYMBOL(sun4v_hvapi_get);
178 
179 void __init sun4v_hvapi_init(void)
180 {
181         unsigned long group, major, minor;
182 
183         group = HV_GRP_SUN4V;
184         major = 1;
185         minor = 0;
186         if (sun4v_hvapi_register(group, major, &minor))
187                 goto bad;
188 
189         group = HV_GRP_CORE;
190         major = 1;
191         minor = 1;
192         if (sun4v_hvapi_register(group, major, &minor))
193                 goto bad;
194 
195         return;
196 
197 bad:
198         prom_printf("HVAPI: Cannot register API group "
199                     "%lx with major(%lu) minor(%lu)\n",
200                     group, major, minor);
201         prom_halt();
202 }
203 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp