[linux-block.git] / arch / arm / xen / enlighten.c

#include <xen/xen.h>
#include <xen/events.h>
#include <xen/grant_table.h>
#include <xen/hvm.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
#include <xen/interface/hvm/params.h>
#include <xen/features.h>
#include <xen/platform_pci.h>
#include <xen/xenbus.h>
#include <xen/page.h>
#include <xen/interface/sched.h>
#include <xen/xen-ops.h>
#include <asm/paravirt.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <asm/system_misc.h>
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/cpuidle.h>
#include <linux/cpufreq.h>
#include <linux/cpu.h>
#include <linux/console.h>
#include <linux/timekeeping.h>

#include <linux/mm.h>

struct start_info _xen_start_info;
struct start_info *xen_start_info = &_xen_start_info;
EXPORT_SYMBOL(xen_start_info);

enum xen_domain_type xen_domain_type = XEN_NATIVE;
EXPORT_SYMBOL(xen_domain_type);

struct shared_info xen_dummy_shared_info;
struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;

DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
static struct vcpu_info __percpu *xen_vcpu_info;

/* These are unused until we support booting "pre-ballooned" */
unsigned long xen_released_pages;
struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;

static __read_mostly unsigned int xen_events_irq;

static __initdata struct device_node *xen_node;

int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
			       unsigned long addr,
			       xen_pfn_t *gfn, int nr,
			       int *err_ptr, pgprot_t prot,
			       unsigned domid,
			       struct page **pages)
{
	return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
					 prot, domid, pages);
}
EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);

/* Not used by XENFEAT_auto_translated guests. */
int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
                              unsigned long addr,
                              xen_pfn_t gfn, int nr,
                              pgprot_t prot, unsigned domid,
                              struct page **pages)
{
	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);

int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
			       int nr, struct page **pages)
{
	return xen_xlate_unmap_gfn_range(vma, nr, pages);
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);

static unsigned long long xen_stolen_accounting(int cpu)
{
	struct vcpu_runstate_info state;

	BUG_ON(cpu != smp_processor_id());

	xen_get_runstate_snapshot(&state);

	WARN_ON(state.state != RUNSTATE_running);

	return state.time[RUNSTATE_runnable] + state.time[RUNSTATE_offline];
}

static void xen_read_wallclock(struct timespec64 *ts)
{
	u32 version;
	struct timespec64 now, ts_monotonic;
	struct shared_info *s = HYPERVISOR_shared_info;
	struct pvclock_wall_clock *wall_clock = &(s->wc);

	/* get wallclock at system boot */
	do {
		version = wall_clock->version;
		rmb();		/* fetch version before time */
		now.tv_sec  = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
		now.tv_nsec = wall_clock->nsec;
		rmb();		/* fetch time before checking version */
	} while ((wall_clock->version & 1) || (version != wall_clock->version));

	/* time since system boot */
	ktime_get_ts64(&ts_monotonic);
	*ts = timespec64_add(now, ts_monotonic);
}

static void xen_percpu_init(void)
{
	struct vcpu_register_vcpu_info info;
	struct vcpu_info *vcpup;
	int err;
	int cpu = get_cpu();

	/* 
	 * VCPUOP_register_vcpu_info cannot be called twice for the same
	 * vcpu, so if vcpu_info is already registered, just get out. This
	 * can happen with cpu-hotplug.
	 */
	if (per_cpu(xen_vcpu, cpu) != NULL)
		goto after_register_vcpu_info;

	pr_info("Xen: initializing cpu%d\n", cpu);
	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);

	info.mfn = virt_to_gfn(vcpup);
	info.offset = xen_offset_in_page(vcpup);

	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
	BUG_ON(err);
	per_cpu(xen_vcpu, cpu) = vcpup;

	xen_setup_runstate_info(cpu);

after_register_vcpu_info:
	enable_percpu_irq(xen_events_irq, 0);
	put_cpu();
}

static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
	int rc;
	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	BUG_ON(rc);
}

static void xen_power_off(void)
{
	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
	int rc;
	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
	BUG_ON(rc);
}

static int xen_cpu_notification(struct notifier_block *self,
				unsigned long action,
				void *hcpu)
{
	switch (action) {
	case CPU_STARTING:
		xen_percpu_init();
		break;
	case CPU_DYING:
		disable_percpu_irq(xen_events_irq);
		break;
	default:
		break;
	}

	return NOTIFY_OK;
}

static struct notifier_block xen_cpu_notifier = {
	.notifier_call = xen_cpu_notification,
};

static irqreturn_t xen_arm_callback(int irq, void *arg)
{
	xen_hvm_evtchn_do_upcall();
	return IRQ_HANDLED;
}

/*
 * see Documentation/devicetree/bindings/arm/xen.txt for the
 * documentation of the Xen Device Tree format.
 */
#define GRANT_TABLE_PHYSADDR 0
void __init xen_early_init(void)
{
	int len;
	const char *s = NULL;
	const char *version = NULL;
	const char *xen_prefix = "xen,xen-";

	xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
	if (!xen_node) {
		pr_debug("No Xen support\n");
		return;
	}
	s = of_get_property(xen_node, "compatible", &len);
	if (strlen(xen_prefix) + 3  < len &&
			!strncmp(xen_prefix, s, strlen(xen_prefix)))
		version = s + strlen(xen_prefix);
	if (version == NULL) {
		pr_debug("Xen version not found\n");
		return;
	}

	pr_info("Xen %s support found\n", version);

	xen_domain_type = XEN_HVM_DOMAIN;

	xen_setup_features();

	if (xen_feature(XENFEAT_dom0))
		xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
	else
		xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);

	if (!console_set_on_cmdline && !xen_initial_domain())
		add_preferred_console("hvc", 0, NULL);
}

static int __init xen_guest_init(void)
{
	struct xen_add_to_physmap xatp;
	struct shared_info *shared_info_page = NULL;
	struct resource res;
	phys_addr_t grant_frames;

	if (!xen_domain())
		return 0;

	if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
		pr_err("Xen grant table base address not found\n");
		return -ENODEV;
	}
	grant_frames = res.start;

	xen_events_irq = irq_of_parse_and_map(xen_node, 0);
	if (!xen_events_irq) {
		pr_err("Xen event channel interrupt not found\n");
		return -ENODEV;
	}

	shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);

	if (!shared_info_page) {
		pr_err("not enough memory\n");
		return -ENOMEM;
	}
	xatp.domid = DOMID_SELF;
	xatp.idx = 0;
	xatp.space = XENMAPSPACE_shared_info;
	xatp.gpfn = virt_to_gfn(shared_info_page);
	if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
		BUG();

	HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;

	/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
	 * page, we use it in the event channel upcall and in some pvclock
	 * related functions. 
	 * The shared info contains exactly 1 CPU (the boot CPU). The guest
	 * is required to use VCPUOP_register_vcpu_info to place vcpu info
	 * for secondary CPUs as they are brought up.
	 * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
	 */
	xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
			                       sizeof(struct vcpu_info));
	if (xen_vcpu_info == NULL)
		return -ENOMEM;

	if (gnttab_setup_auto_xlat_frames(grant_frames)) {
		free_percpu(xen_vcpu_info);
		return -ENOMEM;
	}
	gnttab_init();
	if (!xen_initial_domain())
		xenbus_probe(NULL);

	/*
	 * Making sure board specific code will not set up ops for
	 * cpu idle and cpu freq.
	 */
	disable_cpuidle();
	disable_cpufreq();

	xen_init_IRQ();

	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
			       "events", &xen_vcpu)) {
		pr_err("Error request IRQ %d\n", xen_events_irq);
		return -EINVAL;
	}

	xen_percpu_init();

	register_cpu_notifier(&xen_cpu_notifier);

	pv_time_ops.steal_clock = xen_stolen_accounting;
	static_key_slow_inc(&paravirt_steal_enabled);

	return 0;
}
early_initcall(xen_guest_init);

static int __init xen_pm_init(void)
{
	if (!xen_domain())
		return -ENODEV;

	pm_power_off = xen_power_off;
	arm_pm_restart = xen_restart;
	if (!xen_initial_domain()) {
		struct timespec64 ts;
		xen_read_wallclock(&ts);
		do_settimeofday64(&ts);
	}

	return 0;
}
late_initcall(xen_pm_init);


/* empty stubs */
void xen_arch_pre_suspend(void) { }
void xen_arch_post_suspend(int suspend_cancelled) { }
void xen_timer_resume(void) { }
void xen_arch_resume(void) { }
void xen_arch_suspend(void) { }


/* In the hypercall.S file. */
EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
EXPORT_SYMBOL_GPL(privcmd_call);
Commit	Line	Data
4c071ee5	1	#include <xen/xen.h>
0ec53ecf	2	#include <xen/events.h>
b3b52fd8 SS	3	#include <xen/grant_table.h>
b3b52fd8 SS	4	#include <xen/hvm.h>
9a9ab3cc	5	#include <xen/interface/vcpu.h>
4c071ee5 SS	6	#include <xen/interface/xen.h>
4c071ee5 SS	7	#include <xen/interface/memory.h>
b3b52fd8	8	#include <xen/interface/hvm/params.h>
ef61ee0d	9	#include <xen/features.h>
4c071ee5	10	#include <xen/platform_pci.h>
b3b52fd8	11	#include <xen/xenbus.h>
c61ba729	12	#include <xen/page.h>
6abb749e	13	#include <xen/interface/sched.h>
f832da06	14	#include <xen/xen-ops.h>
34e38523	15	#include <asm/paravirt.h>
4c071ee5 SS	16	#include <asm/xen/hypervisor.h>
4c071ee5 SS	17	#include <asm/xen/hypercall.h>
6abb749e	18	#include <asm/system_misc.h>
0ec53ecf SS	19	#include <linux/interrupt.h>
0ec53ecf SS	20	#include <linux/irqreturn.h>
4c071ee5	21	#include <linux/module.h>
2e01f166 SS	22	#include <linux/of.h>
	23	#include <linux/of_irq.h>
	24	#include <linux/of_address.h>
e1a9c16b JG	25	#include <linux/cpuidle.h>
e1a9c16b JG	26	#include <linux/cpufreq.h>
8b271d57	27	#include <linux/cpu.h>
f1dddd11	28	#include <linux/console.h>
e709fba1	29	#include <linux/timekeeping.h>
4c071ee5	30
f832da06 IC	31	#include <linux/mm.h>
f832da06 IC	32
4c071ee5 SS	33	struct start_info _xen_start_info;
4c071ee5 SS	34	struct start_info *xen_start_info = &_xen_start_info;
35c8ab4c	35	EXPORT_SYMBOL(xen_start_info);
4c071ee5 SS	36
4c071ee5 SS	37	enum xen_domain_type xen_domain_type = XEN_NATIVE;
35c8ab4c	38	EXPORT_SYMBOL(xen_domain_type);
4c071ee5 SS	39
	40	struct shared_info xen_dummy_shared_info;
	41	struct shared_info HYPERVISOR_shared_info = (void )&xen_dummy_shared_info;
	42
	43	DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
9a9ab3cc	44	static struct vcpu_info __percpu *xen_vcpu_info;
4c071ee5	45
c61ba729 IC	46	/* These are unused until we support booting "pre-ballooned" */
	47	unsigned long xen_released_pages;
	48	struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
	49
81e863c3	50	static __read_mostly unsigned int xen_events_irq;
0ec53ecf	51
5882bfef SS	52	static __initdata struct device_node *xen_node;
5882bfef SS	53
a13d7201	54	int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
4c071ee5	55	unsigned long addr,
a13d7201	56	xen_pfn_t *gfn, int nr,
4e8c0c8c DV	57	int *err_ptr, pgprot_t prot,
4e8c0c8c DV	58	unsigned domid,
f832da06	59	struct page **pages)
4c071ee5	60	{
a13d7201	61	return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
628c28ee	62	prot, domid, pages);
4c071ee5	63	}
a13d7201	64	EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
4e8c0c8c DV	65
4e8c0c8c DV	66	/* Not used by XENFEAT_auto_translated guests. */
a13d7201	67	int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
4e8c0c8c	68	unsigned long addr,
a13d7201	69	xen_pfn_t gfn, int nr,
4e8c0c8c DV	70	pgprot_t prot, unsigned domid,
	71	struct page **pages)
	72	{
	73	return -ENOSYS;
	74	}
a13d7201	75	EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
2e01f166	76
a13d7201	77	int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
f832da06 IC	78	int nr, struct page **pages)
f832da06 IC	79	{
628c28ee	80	return xen_xlate_unmap_gfn_range(vma, nr, pages);
f832da06	81	}
a13d7201	82	EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
f832da06	83
34e38523 SS	84	static unsigned long long xen_stolen_accounting(int cpu)
	85	{
	86	struct vcpu_runstate_info state;
	87
	88	BUG_ON(cpu != smp_processor_id());
	89
	90	xen_get_runstate_snapshot(&state);
	91
	92	WARN_ON(state.state != RUNSTATE_running);
	93
	94	return state.time[RUNSTATE_runnable] + state.time[RUNSTATE_offline];
	95	}
	96
e709fba1 SS	97	static void xen_read_wallclock(struct timespec64 *ts)
	98	{
	99	u32 version;
	100	struct timespec64 now, ts_monotonic;
	101	struct shared_info *s = HYPERVISOR_shared_info;
	102	struct pvclock_wall_clock *wall_clock = &(s->wc);
	103
	104	/* get wallclock at system boot */
	105	do {
	106	version = wall_clock->version;
	107	rmb(); /* fetch version before time */
	108	now.tv_sec = ((uint64_t)wall_clock->sec_hi << 32) \| wall_clock->sec;
	109	now.tv_nsec = wall_clock->nsec;
	110	rmb(); /* fetch time before checking version */
	111	} while ((wall_clock->version & 1) \|\| (version != wall_clock->version));
	112
	113	/* time since system boot */
	114	ktime_get_ts64(&ts_monotonic);
	115	*ts = timespec64_add(now, ts_monotonic);
	116	}
	117
8b271d57	118	static void xen_percpu_init(void)
9a9ab3cc SS	119	{
	120	struct vcpu_register_vcpu_info info;
	121	struct vcpu_info *vcpup;
	122	int err;
3cc8e40e	123	int cpu = get_cpu();
9a9ab3cc	124
cb9644bf SS	125	/*
	126	* VCPUOP_register_vcpu_info cannot be called twice for the same
	127	* vcpu, so if vcpu_info is already registered, just get out. This
	128	* can happen with cpu-hotplug.
	129	*/
	130	if (per_cpu(xen_vcpu, cpu) != NULL)
	131	goto after_register_vcpu_info;
	132
9a9ab3cc SS	133	pr_info("Xen: initializing cpu%d\n", cpu);
	134	vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
	135
250c9af3 JG	136	info.mfn = virt_to_gfn(vcpup);
250c9af3 JG	137	info.offset = xen_offset_in_page(vcpup);
9a9ab3cc SS	138
9a9ab3cc SS	139	err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
d7266d78 SS	140	BUG_ON(err);
	141	per_cpu(xen_vcpu, cpu) = vcpup;
	142
34e38523 SS	143	xen_setup_runstate_info(cpu);
34e38523 SS	144
cb9644bf	145	after_register_vcpu_info:
3cc8e40e	146	enable_percpu_irq(xen_events_irq, 0);
0d7febe5	147	put_cpu();
9a9ab3cc SS	148	}
9a9ab3cc SS	149
2451ade0	150	static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
6abb749e SS	151	{
	152	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
	153	int rc;
	154	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
a91c7775	155	BUG_ON(rc);
6abb749e SS	156	}
	157
	158	static void xen_power_off(void)
	159	{
	160	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
	161	int rc;
	162	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
a91c7775	163	BUG_ON(rc);
6abb749e SS	164	}
6abb749e SS	165
8b271d57 JG	166	static int xen_cpu_notification(struct notifier_block *self,
	167	unsigned long action,
	168	void *hcpu)
	169	{
	170	switch (action) {
	171	case CPU_STARTING:
	172	xen_percpu_init();
	173	break;
cb9644bf SS	174	case CPU_DYING:
	175	disable_percpu_irq(xen_events_irq);
	176	break;
8b271d57 JG	177	default:
	178	break;
	179	}
	180
	181	return NOTIFY_OK;
	182	}
	183
	184	static struct notifier_block xen_cpu_notifier = {
	185	.notifier_call = xen_cpu_notification,
	186	};
	187
	188	static irqreturn_t xen_arm_callback(int irq, void *arg)
	189	{
	190	xen_hvm_evtchn_do_upcall();
	191	return IRQ_HANDLED;
	192	}
	193
2e01f166 SS	194	/*
	195	* see Documentation/devicetree/bindings/arm/xen.txt for the
	196	* documentation of the Xen Device Tree format.
	197	*/
b3b52fd8	198	#define GRANT_TABLE_PHYSADDR 0
5882bfef	199	void __init xen_early_init(void)
2e01f166	200	{
2e01f166 SS	201	int len;
	202	const char *s = NULL;
	203	const char *version = NULL;
	204	const char *xen_prefix = "xen,xen-";
	205
5882bfef SS	206	xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
5882bfef SS	207	if (!xen_node) {
2e01f166	208	pr_debug("No Xen support\n");
5882bfef	209	return;
2e01f166	210	}
5882bfef	211	s = of_get_property(xen_node, "compatible", &len);
2e01f166 SS	212	if (strlen(xen_prefix) + 3 < len &&
	213	!strncmp(xen_prefix, s, strlen(xen_prefix)))
	214	version = s + strlen(xen_prefix);
	215	if (version == NULL) {
	216	pr_debug("Xen version not found\n");
5882bfef	217	return;
81e863c3 JG	218	}
81e863c3 JG	219
5882bfef	220	pr_info("Xen %s support found\n", version);
8b271d57	221
2e01f166 SS	222	xen_domain_type = XEN_HVM_DOMAIN;
2e01f166 SS	223
ef61ee0d	224	xen_setup_features();
5ebc77de	225
ef61ee0d SS	226	if (xen_feature(XENFEAT_dom0))
	227	xen_start_info->flags \|= SIF_INITDOMAIN\|SIF_PRIVILEGED;
	228	else
	229	xen_start_info->flags &= ~(SIF_INITDOMAIN\|SIF_PRIVILEGED);
f1dddd11 AB	230
	231	if (!console_set_on_cmdline && !xen_initial_domain())
	232	add_preferred_console("hvc", 0, NULL);
5882bfef SS	233	}
	234
	235	static int __init xen_guest_init(void)
	236	{
	237	struct xen_add_to_physmap xatp;
	238	struct shared_info *shared_info_page = NULL;
	239	struct resource res;
	240	phys_addr_t grant_frames;
	241
	242	if (!xen_domain())
	243	return 0;
	244
	245	if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
	246	pr_err("Xen grant table base address not found\n");
	247	return -ENODEV;
	248	}
	249	grant_frames = res.start;
	250
	251	xen_events_irq = irq_of_parse_and_map(xen_node, 0);
	252	if (!xen_events_irq) {
	253	pr_err("Xen event channel interrupt not found\n");
	254	return -ENODEV;
	255	}
	256
	257	shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
ef61ee0d	258
2e01f166 SS	259	if (!shared_info_page) {
	260	pr_err("not enough memory\n");
	261	return -ENOMEM;
	262	}
	263	xatp.domid = DOMID_SELF;
	264	xatp.idx = 0;
	265	xatp.space = XENMAPSPACE_shared_info;
250c9af3	266	xatp.gpfn = virt_to_gfn(shared_info_page);
2e01f166 SS	267	if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
	268	BUG();
	269
	270	HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
	271
	272	/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
	273	* page, we use it in the event channel upcall and in some pvclock
9a9ab3cc	274	* related functions.
2e01f166 SS	275	* The shared info contains exactly 1 CPU (the boot CPU). The guest
2e01f166 SS	276	* is required to use VCPUOP_register_vcpu_info to place vcpu info
9a9ab3cc SS	277	* for secondary CPUs as they are brought up.
	278	* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
	279	*/
	280	xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
	281	sizeof(struct vcpu_info));
	282	if (xen_vcpu_info == NULL)
	283	return -ENOMEM;
b3b52fd8	284
efaf30a3 KRW	285	if (gnttab_setup_auto_xlat_frames(grant_frames)) {
	286	free_percpu(xen_vcpu_info);
	287	return -ENOMEM;
	288	}
b3b52fd8 SS	289	gnttab_init();
	290	if (!xen_initial_domain())
	291	xenbus_probe(NULL);
	292
e1a9c16b JG	293	/*
	294	* Making sure board specific code will not set up ops for
	295	* cpu idle and cpu freq.
	296	*/
	297	disable_cpuidle();
	298	disable_cpufreq();
	299
8b271d57 JG	300	xen_init_IRQ();
	301
	302	if (request_percpu_irq(xen_events_irq, xen_arm_callback,
	303	"events", &xen_vcpu)) {
	304	pr_err("Error request IRQ %d\n", xen_events_irq);
	305	return -EINVAL;
	306	}
	307
	308	xen_percpu_init();
	309
	310	register_cpu_notifier(&xen_cpu_notifier);
	311
34e38523 SS	312	pv_time_ops.steal_clock = xen_stolen_accounting;
	313	static_key_slow_inc(&paravirt_steal_enabled);
	314
1aa3d8d9 SS	315	return 0;
1aa3d8d9 SS	316	}
8b271d57	317	early_initcall(xen_guest_init);
1aa3d8d9 SS	318
	319	static int __init xen_pm_init(void)
	320	{
9dd4b294 RH	321	if (!xen_domain())
	322	return -ENODEV;
	323
6abb749e SS	324	pm_power_off = xen_power_off;
6abb749e SS	325	arm_pm_restart = xen_restart;
e709fba1 SS	326	if (!xen_initial_domain()) {
	327	struct timespec64 ts;
	328	xen_read_wallclock(&ts);
	329	do_settimeofday64(&ts);
	330	}
6abb749e	331
2e01f166 SS	332	return 0;
2e01f166 SS	333	}
9dd4b294	334	late_initcall(xen_pm_init);
0ec53ecf	335
79390289 SS	336
	337	/* empty stubs */
	338	void xen_arch_pre_suspend(void) { }
	339	void xen_arch_post_suspend(int suspend_cancelled) { }
	340	void xen_timer_resume(void) { }
	341	void xen_arch_resume(void) { }
ffb7dbed	342	void xen_arch_suspend(void) { }
79390289 SS	343
79390289 SS	344
d5f985c8	345	/* In the hypercall.S file. */
911dec0d KRW	346	EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
911dec0d KRW	347	EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
ab277bbf SS	348	EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
	349	EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
	350	EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
	351	EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
	352	EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
	353	EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
ea0af613	354	EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
176455e9	355	EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
72d39c69	356	EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
9f1d3414	357	EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
911dec0d	358	EXPORT_SYMBOL_GPL(privcmd_call);