1 files changed, 193 insertions, 0 deletions
diff --git a/arch/sparc/kernel/hvapi.c b/arch/sparc/kernel/hvapi.c
new file mode 100644
index 000000000000..1d272c3b5740
--- /dev/null
+++ b/arch/sparc/kernel/hvapi.c
@@ -0,0 +1,193 @@
+/* hvapi.c: Hypervisor API management.
+ *
+ * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <asm/hypervisor.h>
+#include <asm/oplib.h>
+/* If the hypervisor indicates that the API setting
+ * calls are unsupported, by returning HV_EBADTRAP or
+ * HV_ENOTSUPPORTED, we assume that API groups with the
+ * PRE_API flag set are major 1 minor 0.
+ */
+struct api_info {
+        unsigned long group;
+        unsigned long major;
+        unsigned long minor;
+        unsigned int refcnt;
+        unsigned int flags;
+#define FLAG_PRE_API            0x00000001
+};
+static struct api_info api_table[] = {
+        { .group = HV_GRP_SUN4V,        .flags = FLAG_PRE_API   },
+        { .group = HV_GRP_CORE,         .flags = FLAG_PRE_API   },
+        { .group = HV_GRP_INTR,                                 },
+        { .group = HV_GRP_SOFT_STATE,                           },
+        { .group = HV_GRP_PCI,          .flags = FLAG_PRE_API   },
+        { .group = HV_GRP_LDOM,                                 },
+        { .group = HV_GRP_SVC_CHAN,     .flags = FLAG_PRE_API   },
+        { .group = HV_GRP_NCS,          .flags = FLAG_PRE_API   },
+        { .group = HV_GRP_RNG,                                  },
+        { .group = HV_GRP_NIAG_PERF,    .flags = FLAG_PRE_API   },
+        { .group = HV_GRP_FIRE_PERF,                            },
+        { .group = HV_GRP_N2_CPU,                               },
+        { .group = HV_GRP_NIU,                                  },
+        { .group = HV_GRP_VF_CPU,                               },
+        { .group = HV_GRP_DIAG,         .flags = FLAG_PRE_API   },
+};
+static DEFINE_SPINLOCK(hvapi_lock);
+static struct api_info *__get_info(unsigned long group)
+{
+        int i;
+        for (i = 0; i < ARRAY_SIZE(api_table); i++) {
+                if (api_table[i].group == group)
+                        return &api_table[i];
+        }
+        return NULL;
+}
+static void __get_ref(struct api_info *p)
+{
+        p->refcnt++;
+}
+static void __put_ref(struct api_info *p)
+{
+        if (--p->refcnt == 0) {
+                unsigned long ignore;
+                sun4v_set_version(p->group, 0, 0, &ignore);
+                p->major = p->minor = 0;
+        }
+}
+/* Register a hypervisor API specification.  It indicates the
+ * API group and desired major+minor.
+ *
+ * If an existing API registration exists '0' (success) will
+ * be returned if it is compatible with the one being registered.
+ * Otherwise a negative error code will be returned.
+ *
+ * Otherwise an attempt will be made to negotiate the requested
+ * API group/major/minor with the hypervisor, and errors returned
+ * if that does not succeed.
+ */
+int sun4v_hvapi_register(unsigned long group, unsigned long major,
+                         unsigned long *minor)
+{
+        struct api_info *p;
+        unsigned long flags;
+        int ret;
+        spin_lock_irqsave(&hvapi_lock, flags);
+        p = __get_info(group);
+        ret = -EINVAL;
+        if (p) {
+                if (p->refcnt) {
+                        ret = -EINVAL;
+                        if (p->major == major) {
+                                *minor = p->minor;
+                                ret = 0;
+                        }
+                } else {
+                        unsigned long actual_minor;
+                        unsigned long hv_ret;
+                        hv_ret = sun4v_set_version(group, major, *minor,
+                                                   &actual_minor);
+                        ret = -EINVAL;
+                        if (hv_ret == HV_EOK) {
+                                *minor = actual_minor;
+                                p->major = major;
+                                p->minor = actual_minor;
+                                ret = 0;
+                        } else if (hv_ret == HV_EBADTRAP ||
+                                   hv_ret == HV_ENOTSUPPORTED) {
+                                if (p->flags & FLAG_PRE_API) {
+                                        if (major == 1) {
+                                                p->major = 1;
+                                                p->minor = 0;
+                                                *minor = 0;
+                                                ret = 0;
+                                        }
+                                }
+                        }
+                }
+                if (ret == 0)
+                        __get_ref(p);
+        }
+        spin_unlock_irqrestore(&hvapi_lock, flags);
+        return ret;
+}
+EXPORT_SYMBOL(sun4v_hvapi_register);
+void sun4v_hvapi_unregister(unsigned long group)
+{
+        struct api_info *p;
+        unsigned long flags;
+        spin_lock_irqsave(&hvapi_lock, flags);
+        p = __get_info(group);
+        if (p)
+                __put_ref(p);
+        spin_unlock_irqrestore(&hvapi_lock, flags);
+}
+EXPORT_SYMBOL(sun4v_hvapi_unregister);
+int sun4v_hvapi_get(unsigned long group,
+                    unsigned long *major,
+                    unsigned long *minor)
+{
+        struct api_info *p;
+        unsigned long flags;
+        int ret;
+        spin_lock_irqsave(&hvapi_lock, flags);
+        ret = -EINVAL;
+        p = __get_info(group);
+        if (p && p->refcnt) {
+                *major = p->major;
+                *minor = p->minor;
+                ret = 0;
+        }
+        spin_unlock_irqrestore(&hvapi_lock, flags);
+        return ret;
+}
+EXPORT_SYMBOL(sun4v_hvapi_get);
+void __init sun4v_hvapi_init(void)
+{
+        unsigned long group, major, minor;
+        group = HV_GRP_SUN4V;
+        major = 1;
+        minor = 0;
+        if (sun4v_hvapi_register(group, major, &minor))
+                goto bad;
+        group = HV_GRP_CORE;
+        major = 1;
+        minor = 1;
+        if (sun4v_hvapi_register(group, major, &minor))
+                goto bad;
+        return;
+bad:
+        prom_printf("HVAPI: Cannot register API group "
+                    "%lx with major(%u) minor(%u)\n",
+                    group, major, minor);
+        prom_halt();
+}

diff --git a/arch/sparc/kernel/hvapi.c b/arch/sparc/kernel/hvapi.c new file mode 100644 index 000000000000..1d272c3b5740 --- /dev/null +++ b/arch/sparc/kernel/hvapi.c
@@ -0,0 +1,193 @@
	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/module.h>
	7	#include <linux/init.h>
	8	#include <linux/slab.h>
	9
	10	#include <asm/hypervisor.h>
	11	#include <asm/oplib.h>
	12
	13	/* If the hypervisor indicates that the API setting
	14	* calls are unsupported, by returning HV_EBADTRAP or
	15	* HV_ENOTSUPPORTED, we assume that API groups with the
	16	* PRE_API flag set are major 1 minor 0.
	17	*/
	18	struct api_info {
	19	unsigned long group;
	20	unsigned long major;
	21	unsigned long minor;
	22	unsigned int refcnt;
	23	unsigned int flags;
	24	#define FLAG_PRE_API 0x00000001
	25	};
	26
	27	static struct api_info api_table[] = {
	28	{ .group = HV_GRP_SUN4V, .flags = FLAG_PRE_API },
	29	{ .group = HV_GRP_CORE, .flags = FLAG_PRE_API },
	30	{ .group = HV_GRP_INTR, },
	31	{ .group = HV_GRP_SOFT_STATE, },
	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_NIAG_PERF, .flags = FLAG_PRE_API },
	38	{ .group = HV_GRP_FIRE_PERF, },
	39	{ .group = HV_GRP_N2_CPU, },
	40	{ .group = HV_GRP_NIU, },
	41	{ .group = HV_GRP_VF_CPU, },
	42	{ .group = HV_GRP_DIAG, .flags = FLAG_PRE_API },
	43	};
	44
	45	static DEFINE_SPINLOCK(hvapi_lock);
	46
	47	static struct api_info *__get_info(unsigned long group)
	48	{
	49	int i;
	50
	51	for (i = 0; i < ARRAY_SIZE(api_table); i++) {
	52	if (api_table[i].group == group)
	53	return &api_table[i];
	54	}
	55	return NULL;
	56	}
	57
	58	static void __get_ref(struct api_info *p)
	59	{
	60	p->refcnt++;
	61	}
	62
	63	static void __put_ref(struct api_info *p)
	64	{
	65	if (--p->refcnt == 0) {
	66	unsigned long ignore;
	67
	68	sun4v_set_version(p->group, 0, 0, &ignore);
	69	p->major = p->minor = 0;
	70	}
	71	}
	72
	73	/* Register a hypervisor API specification. It indicates the
	74	* API group and desired major+minor.
	75	*
	76	* If an existing API registration exists '0' (success) will
	77	* be returned if it is compatible with the one being registered.
	78	* Otherwise a negative error code will be returned.
	79	*
	80	* Otherwise an attempt will be made to negotiate the requested
	81	* API group/major/minor with the hypervisor, and errors returned
	82	* if that does not succeed.
	83	*/
	84	int sun4v_hvapi_register(unsigned long group, unsigned long major,
	85	unsigned long *minor)
	86	{
	87	struct api_info *p;
	88	unsigned long flags;
	89	int ret;
	90
	91	spin_lock_irqsave(&hvapi_lock, flags);
	92	p = __get_info(group);
	93	ret = -EINVAL;
	94	if (p) {
	95	if (p->refcnt) {
	96	ret = -EINVAL;
	97	if (p->major == major) {
	98	*minor = p->minor;
	99	ret = 0;
	100	}
	101	} else {
	102	unsigned long actual_minor;
	103	unsigned long hv_ret;
	104
	105	hv_ret = sun4v_set_version(group, major, *minor,
	106	&actual_minor);
	107	ret = -EINVAL;
	108	if (hv_ret == HV_EOK) {
	109	*minor = actual_minor;
	110	p->major = major;
	111	p->minor = actual_minor;
	112	ret = 0;
	113	} else if (hv_ret == HV_EBADTRAP \|\|
	114	hv_ret == HV_ENOTSUPPORTED) {
	115	if (p->flags & FLAG_PRE_API) {
	116	if (major == 1) {
	117	p->major = 1;
	118	p->minor = 0;
	119	*minor = 0;
	120	ret = 0;
	121	}
	122	}
	123	}
	124	}
	125
	126	if (ret == 0)
	127	__get_ref(p);
	128	}
	129	spin_unlock_irqrestore(&hvapi_lock, flags);
	130
	131	return ret;
	132	}
	133	EXPORT_SYMBOL(sun4v_hvapi_register);
	134
	135	void sun4v_hvapi_unregister(unsigned long group)
	136	{
	137	struct api_info *p;
	138	unsigned long flags;
	139
	140	spin_lock_irqsave(&hvapi_lock, flags);
	141	p = __get_info(group);
	142	if (p)
	143	__put_ref(p);
	144	spin_unlock_irqrestore(&hvapi_lock, flags);
	145	}
	146	EXPORT_SYMBOL(sun4v_hvapi_unregister);
	147
	148	int sun4v_hvapi_get(unsigned long group,
	149	unsigned long *major,
	150	unsigned long *minor)
	151	{
	152	struct api_info *p;
	153	unsigned long flags;
	154	int ret;
	155
	156	spin_lock_irqsave(&hvapi_lock, flags);
	157	ret = -EINVAL;
	158	p = __get_info(group);
	159	if (p && p->refcnt) {
	160	*major = p->major;
	161	*minor = p->minor;
	162	ret = 0;
	163	}
	164	spin_unlock_irqrestore(&hvapi_lock, flags);
	165
	166	return ret;
	167	}
	168	EXPORT_SYMBOL(sun4v_hvapi_get);
	169
	170	void __init sun4v_hvapi_init(void)
	171	{
	172	unsigned long group, major, minor;
	173
	174	group = HV_GRP_SUN4V;
	175	major = 1;
	176	minor = 0;
	177	if (sun4v_hvapi_register(group, major, &minor))
	178	goto bad;
	179
	180	group = HV_GRP_CORE;
	181	major = 1;
	182	minor = 1;
	183	if (sun4v_hvapi_register(group, major, &minor))
	184	goto bad;
	185
	186	return;
	187
	188	bad:
	189	prom_printf("HVAPI: Cannot register API group "
	190	"%lx with major(%u) minor(%u)\n",
	191	group, major, minor);
	192	prom_halt();
	193	}