[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / xen / smp.c

/*
 * Xen SMP support
 *
 * This file implements the Xen versions of smp_ops.  SMP under Xen is
 * very straightforward.  Bringing a CPU up is simply a matter of
 * loading its initial context and setting it running.
 *
 * IPIs are handled through the Xen event mechanism.
 *
 * Because virtual CPUs can be scheduled onto any real CPU, there's no
 * useful topology information for the kernel to make use of.  As a
 * result, all CPUs are treated as if they're single-core and
 * single-threaded.
 */
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/irq_work.h>

#include <asm/paravirt.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cpu.h>

#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>

#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>

#include <xen/xen.h>
#include <xen/page.h>
#include <xen/events.h>

#include <xen/hvc-console.h>
#include "xen-ops.h"
#include "mmu.h"

cpumask_var_t xen_cpu_initialized_map;

static DEFINE_PER_CPU(int, xen_resched_irq);
static DEFINE_PER_CPU(int, xen_callfunc_irq);
static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
static DEFINE_PER_CPU(int, xen_irq_work);
static DEFINE_PER_CPU(int, xen_debug_irq) = -1;

static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);

/*
 * Reschedule call back.
 */
static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
{
	inc_irq_stat(irq_resched_count);
	scheduler_ipi();

	return IRQ_HANDLED;
}

static void __cpuinit cpu_bringup(void)
{
	int cpu;

	cpu_init();
	touch_softlockup_watchdog();
	preempt_disable();

	xen_enable_sysenter();
	xen_enable_syscall();

	cpu = smp_processor_id();
	smp_store_cpu_info(cpu);
	cpu_data(cpu).x86_max_cores = 1;
	set_cpu_sibling_map(cpu);

	xen_setup_cpu_clockevents();

	notify_cpu_starting(cpu);

	set_cpu_online(cpu, true);

	this_cpu_write(cpu_state, CPU_ONLINE);

	wmb();

	/* We can take interrupts now: we're officially "up". */
	local_irq_enable();

	wmb();			/* make sure everything is out */
}

static void __cpuinit cpu_bringup_and_idle(void)
{
	cpu_bringup();
	cpu_idle();
}

static int xen_smp_intr_init(unsigned int cpu)
{
	int rc;
	const char *resched_name, *callfunc_name, *debug_name;

	resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
				    cpu,
				    xen_reschedule_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    resched_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_resched_irq, cpu) = rc;

	callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
				    cpu,
				    xen_call_function_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_callfunc_irq, cpu) = rc;

	debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
	rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
				     IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
				     debug_name, NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_debug_irq, cpu) = rc;

	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
				    cpu,
				    xen_call_function_single_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_callfuncsingle_irq, cpu) = rc;

	callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
	rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
				    cpu,
				    xen_irq_work_interrupt,
				    IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
				    callfunc_name,
				    NULL);
	if (rc < 0)
		goto fail;
	per_cpu(xen_irq_work, cpu) = rc;

	return 0;

 fail:
	if (per_cpu(xen_resched_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	if (per_cpu(xen_callfunc_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	if (per_cpu(xen_debug_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
				       NULL);
	if (per_cpu(xen_irq_work, cpu) >= 0)
		unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);

	return rc;
}

static void __init xen_fill_possible_map(void)
{
	int i, rc;

	if (xen_initial_domain())
		return;

	for (i = 0; i < nr_cpu_ids; i++) {
		rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
		if (rc >= 0) {
			num_processors++;
			set_cpu_possible(i, true);
		}
	}
}

static void __init xen_filter_cpu_maps(void)
{
	int i, rc;
	unsigned int subtract = 0;

	if (!xen_initial_domain())
		return;

	num_processors = 0;
	disabled_cpus = 0;
	for (i = 0; i < nr_cpu_ids; i++) {
		rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
		if (rc >= 0) {
			num_processors++;
			set_cpu_possible(i, true);
		} else {
			set_cpu_possible(i, false);
			set_cpu_present(i, false);
			subtract++;
		}
	}
#ifdef CONFIG_HOTPLUG_CPU
	/* This is akin to using 'nr_cpus' on the Linux command line.
	 * Which is OK as when we use 'dom0_max_vcpus=X' we can only
	 * have up to X, while nr_cpu_ids is greater than X. This
	 * normally is not a problem, except when CPU hotplugging
	 * is involved and then there might be more than X CPUs
	 * in the guest - which will not work as there is no
	 * hypercall to expand the max number of VCPUs an already
	 * running guest has. So cap it up to X. */
	if (subtract)
		nr_cpu_ids = nr_cpu_ids - subtract;
#endif

}

static void __init xen_smp_prepare_boot_cpu(void)
{
	BUG_ON(smp_processor_id() != 0);
	native_smp_prepare_boot_cpu();

	/* We've switched to the "real" per-cpu gdt, so make sure the
	   old memory can be recycled */
	make_lowmem_page_readwrite(xen_initial_gdt);

	xen_filter_cpu_maps();
	xen_setup_vcpu_info_placement();
}

static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
{
	unsigned cpu;
	unsigned int i;

	if (skip_ioapic_setup) {
		char *m = (max_cpus == 0) ?
			"The nosmp parameter is incompatible with Xen; " \
			"use Xen dom0_max_vcpus=1 parameter" :
			"The noapic parameter is incompatible with Xen";

		xen_raw_printk(m);
		panic(m);
	}
	xen_init_lock_cpu(0);

	smp_store_boot_cpu_info();
	cpu_data(0).x86_max_cores = 1;

	for_each_possible_cpu(i) {
		zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
		zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
		zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
	}
	set_cpu_sibling_map(0);

	if (xen_smp_intr_init(0))
		BUG();

	if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
		panic("could not allocate xen_cpu_initialized_map\n");

	cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));

	/* Restrict the possible_map according to max_cpus. */
	while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
		for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
			continue;
		set_cpu_possible(cpu, false);
	}

	for_each_possible_cpu(cpu)
		set_cpu_present(cpu, true);
}

static int __cpuinit
cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
{
	struct vcpu_guest_context *ctxt;
	struct desc_struct *gdt;
	unsigned long gdt_mfn;

	if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
		return 0;

	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
	if (ctxt == NULL)
		return -ENOMEM;

	gdt = get_cpu_gdt_table(cpu);

	ctxt->flags = VGCF_IN_KERNEL;
	ctxt->user_regs.ds = __USER_DS;
	ctxt->user_regs.es = __USER_DS;
	ctxt->user_regs.ss = __KERNEL_DS;
#ifdef CONFIG_X86_32
	ctxt->user_regs.fs = __KERNEL_PERCPU;
	ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
#else
	ctxt->gs_base_kernel = per_cpu_offset(cpu);
#endif
	ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
	ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */

	memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));

	xen_copy_trap_info(ctxt->trap_ctxt);

	ctxt->ldt_ents = 0;

	BUG_ON((unsigned long)gdt & ~PAGE_MASK);

	gdt_mfn = arbitrary_virt_to_mfn(gdt);
	make_lowmem_page_readonly(gdt);
	make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));

	ctxt->gdt_frames[0] = gdt_mfn;
	ctxt->gdt_ents      = GDT_ENTRIES;

	ctxt->user_regs.cs = __KERNEL_CS;
	ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);

	ctxt->kernel_ss = __KERNEL_DS;
	ctxt->kernel_sp = idle->thread.sp0;

#ifdef CONFIG_X86_32
	ctxt->event_callback_cs     = __KERNEL_CS;
	ctxt->failsafe_callback_cs  = __KERNEL_CS;
#endif
	ctxt->event_callback_eip    = (unsigned long)xen_hypervisor_callback;
	ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback;

	per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
	ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));

	if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
		BUG();

	kfree(ctxt);
	return 0;
}

static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle)
{
	int rc;

	per_cpu(current_task, cpu) = idle;
#ifdef CONFIG_X86_32
	irq_ctx_init(cpu);
#else
	clear_tsk_thread_flag(idle, TIF_FORK);
	per_cpu(kernel_stack, cpu) =
		(unsigned long)task_stack_page(idle) -
		KERNEL_STACK_OFFSET + THREAD_SIZE;
#endif
	xen_setup_runstate_info(cpu);
	xen_setup_timer(cpu);
	xen_init_lock_cpu(cpu);

	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;

	/* make sure interrupts start blocked */
	per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;

	rc = cpu_initialize_context(cpu, idle);
	if (rc)
		return rc;

	if (num_online_cpus() == 1)
		/* Just in case we booted with a single CPU. */
		alternatives_enable_smp();

	rc = xen_smp_intr_init(cpu);
	if (rc)
		return rc;

	rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
	BUG_ON(rc);

	while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
		HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
		barrier();
	}

	return 0;
}

static void xen_smp_cpus_done(unsigned int max_cpus)
{
}

#ifdef CONFIG_HOTPLUG_CPU
static int xen_cpu_disable(void)
{
	unsigned int cpu = smp_processor_id();
	if (cpu == 0)
		return -EBUSY;

	cpu_disable_common();

	load_cr3(swapper_pg_dir);
	return 0;
}

static void xen_cpu_die(unsigned int cpu)
{
	while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
		current->state = TASK_UNINTERRUPTIBLE;
		schedule_timeout(HZ/10);
	}
	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
	xen_uninit_lock_cpu(cpu);
	xen_teardown_timer(cpu);
}

static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
{
	play_dead_common();
	HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
	cpu_bringup();
}

#else /* !CONFIG_HOTPLUG_CPU */
static int xen_cpu_disable(void)
{
	return -ENOSYS;
}

static void xen_cpu_die(unsigned int cpu)
{
	BUG();
}

static void xen_play_dead(void)
{
	BUG();
}

#endif
static void stop_self(void *v)
{
	int cpu = smp_processor_id();

	/* make sure we're not pinning something down */
	load_cr3(swapper_pg_dir);
	/* should set up a minimal gdt */

	set_cpu_online(cpu, false);

	HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
	BUG();
}

static void xen_stop_other_cpus(int wait)
{
	smp_call_function(stop_self, NULL, wait);
}

static void xen_smp_send_reschedule(int cpu)
{
	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
}

static void __xen_send_IPI_mask(const struct cpumask *mask,
			      int vector)
{
	unsigned cpu;

	for_each_cpu_and(cpu, mask, cpu_online_mask)
		xen_send_IPI_one(cpu, vector);
}

static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
{
	int cpu;

	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);

	/* Make sure other vcpus get a chance to run if they need to. */
	for_each_cpu(cpu, mask) {
		if (xen_vcpu_stolen(cpu)) {
			HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
			break;
		}
	}
}

static void xen_smp_send_call_function_single_ipi(int cpu)
{
	__xen_send_IPI_mask(cpumask_of(cpu),
			  XEN_CALL_FUNCTION_SINGLE_VECTOR);
}

static inline int xen_map_vector(int vector)
{
	int xen_vector;

	switch (vector) {
	case RESCHEDULE_VECTOR:
		xen_vector = XEN_RESCHEDULE_VECTOR;
		break;
	case CALL_FUNCTION_VECTOR:
		xen_vector = XEN_CALL_FUNCTION_VECTOR;
		break;
	case CALL_FUNCTION_SINGLE_VECTOR:
		xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
		break;
	case IRQ_WORK_VECTOR:
		xen_vector = XEN_IRQ_WORK_VECTOR;
		break;
	default:
		xen_vector = -1;
		printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
			vector);
	}

	return xen_vector;
}

void xen_send_IPI_mask(const struct cpumask *mask,
			      int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		__xen_send_IPI_mask(mask, xen_vector);
}

void xen_send_IPI_all(int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		__xen_send_IPI_mask(cpu_online_mask, xen_vector);
}

void xen_send_IPI_self(int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		xen_send_IPI_one(smp_processor_id(), xen_vector);
}

void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
				int vector)
{
	unsigned cpu;
	unsigned int this_cpu = smp_processor_id();

	if (!(num_online_cpus() > 1))
		return;

	for_each_cpu_and(cpu, mask, cpu_online_mask) {
		if (this_cpu == cpu)
			continue;

		xen_smp_send_call_function_single_ipi(cpu);
	}
}

void xen_send_IPI_allbutself(int vector)
{
	int xen_vector = xen_map_vector(vector);

	if (xen_vector >= 0)
		xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector);
}

static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
{
	irq_enter();
	generic_smp_call_function_interrupt();
	inc_irq_stat(irq_call_count);
	irq_exit();

	return IRQ_HANDLED;
}

static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
{
	irq_enter();
	generic_smp_call_function_single_interrupt();
	inc_irq_stat(irq_call_count);
	irq_exit();

	return IRQ_HANDLED;
}

static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
{
	irq_enter();
	irq_work_run();
	inc_irq_stat(apic_irq_work_irqs);
	irq_exit();

	return IRQ_HANDLED;
}

static const struct smp_ops xen_smp_ops __initconst = {
	.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
	.smp_prepare_cpus = xen_smp_prepare_cpus,
	.smp_cpus_done = xen_smp_cpus_done,

	.cpu_up = xen_cpu_up,
	.cpu_die = xen_cpu_die,
	.cpu_disable = xen_cpu_disable,
	.play_dead = xen_play_dead,

	.stop_other_cpus = xen_stop_other_cpus,
	.smp_send_reschedule = xen_smp_send_reschedule,

	.send_call_func_ipi = xen_smp_send_call_function_ipi,
	.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
};

void __init xen_smp_init(void)
{
	smp_ops = xen_smp_ops;
	xen_fill_possible_map();
	xen_init_spinlocks();
}

static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
{
	native_smp_prepare_cpus(max_cpus);
	WARN_ON(xen_smp_intr_init(0));

	xen_init_lock_cpu(0);
}

static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
{
	int rc;
	rc = native_cpu_up(cpu, tidle);
	WARN_ON (xen_smp_intr_init(cpu));
	return rc;
}

static void xen_hvm_cpu_die(unsigned int cpu)
{
	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
	native_cpu_die(cpu);
}

void __init xen_hvm_smp_init(void)
{
	if (!xen_have_vector_callback)
		return;
	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
	smp_ops.cpu_up = xen_hvm_cpu_up;
	smp_ops.cpu_die = xen_hvm_cpu_die;
	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
}
Commit	Line	Data
f87e4cac JF	1	/*
	2	* Xen SMP support
	3	*
	4	* This file implements the Xen versions of smp_ops. SMP under Xen is
	5	* very straightforward. Bringing a CPU up is simply a matter of
	6	* loading its initial context and setting it running.
	7	*
	8	* IPIs are handled through the Xen event mechanism.
	9	*
	10	* Because virtual CPUs can be scheduled onto any real CPU, there's no
	11	* useful topology information for the kernel to make use of. As a
	12	* result, all CPUs are treated as if they're single-core and
	13	* single-threaded.
f87e4cac JF	14	*/
	15	#include <linux/sched.h>
	16	#include <linux/err.h>
5a0e3ad6	17	#include <linux/slab.h>
f87e4cac	18	#include <linux/smp.h>
1ff2b0c3	19	#include <linux/irq_work.h>
f87e4cac JF	20
	21	#include <asm/paravirt.h>
	22	#include <asm/desc.h>
	23	#include <asm/pgtable.h>
	24	#include <asm/cpu.h>
	25
	26	#include <xen/interface/xen.h>
	27	#include <xen/interface/vcpu.h>
	28
	29	#include <asm/xen/interface.h>
	30	#include <asm/xen/hypercall.h>
	31
ea5b8f73	32	#include <xen/xen.h>
f87e4cac JF	33	#include <xen/page.h>
	34	#include <xen/events.h>
	35
ed467e69	36	#include <xen/hvc-console.h>
f87e4cac JF	37	#include "xen-ops.h"
	38	#include "mmu.h"
	39
b78936e1	40	cpumask_var_t xen_cpu_initialized_map;
f87e4cac	41
c6e22f9e TH	42	static DEFINE_PER_CPU(int, xen_resched_irq);
	43	static DEFINE_PER_CPU(int, xen_callfunc_irq);
	44	static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
1ff2b0c3	45	static DEFINE_PER_CPU(int, xen_irq_work);
c6e22f9e	46	static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
f87e4cac JF	47
f87e4cac JF	48	static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
3b16cf87	49	static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
1ff2b0c3	50	static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id);
f87e4cac JF	51
f87e4cac JF	52	/*
184748cc	53	* Reschedule call back.
f87e4cac JF	54	*/
	55	static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
	56	{
1b437c8c	57	inc_irq_stat(irq_resched_count);
184748cc	58	scheduler_ipi();
38bb5ab4	59
f87e4cac JF	60	return IRQ_HANDLED;
	61	}
	62
b53cedeb	63	static void __cpuinit cpu_bringup(void)
f87e4cac	64	{
e8c9e788	65	int cpu;
f87e4cac JF	66
f87e4cac JF	67	cpu_init();
d68d82af	68	touch_softlockup_watchdog();
c7b75947 JF	69	preempt_disable();
c7b75947 JF	70
e2a81baf	71	xen_enable_sysenter();
6fcac6d3	72	xen_enable_syscall();
f87e4cac	73
c7b75947 JF	74	cpu = smp_processor_id();
	75	smp_store_cpu_info(cpu);
	76	cpu_data(cpu).x86_max_cores = 1;
	77	set_cpu_sibling_map(cpu);
f87e4cac JF	78
	79	xen_setup_cpu_clockevents();
	80
106b4438 KRW	81	notify_cpu_starting(cpu);
106b4438 KRW	82
d7d3756c	83	set_cpu_online(cpu, true);
106b4438	84
2113f469	85	this_cpu_write(cpu_state, CPU_ONLINE);
106b4438	86
c7b75947 JF	87	wmb();
c7b75947 JF	88
f87e4cac JF	89	/* We can take interrupts now: we're officially "up". */
	90	local_irq_enable();
	91
	92	wmb(); /* make sure everything is out */
d68d82af AN	93	}
d68d82af AN	94
b53cedeb	95	static void __cpuinit cpu_bringup_and_idle(void)
d68d82af AN	96	{
d68d82af AN	97	cpu_bringup();
f87e4cac JF	98	cpu_idle();
	99	}
	100
	101	static int xen_smp_intr_init(unsigned int cpu)
	102	{
	103	int rc;
ee523ca1	104	const char resched_name, callfunc_name, *debug_name;
f87e4cac JF	105
	106	resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
	107	rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
	108	cpu,
	109	xen_reschedule_interrupt,
	110	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	111	resched_name,
	112	NULL);
	113	if (rc < 0)
	114	goto fail;
c6e22f9e	115	per_cpu(xen_resched_irq, cpu) = rc;
f87e4cac JF	116
	117	callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
	118	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
	119	cpu,
	120	xen_call_function_interrupt,
	121	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	122	callfunc_name,
	123	NULL);
	124	if (rc < 0)
	125	goto fail;
c6e22f9e	126	per_cpu(xen_callfunc_irq, cpu) = rc;
f87e4cac	127
ee523ca1 JF	128	debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
	129	rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
	130	IRQF_DISABLED \| IRQF_PERCPU \| IRQF_NOBALANCING,
	131	debug_name, NULL);
	132	if (rc < 0)
	133	goto fail;
c6e22f9e	134	per_cpu(xen_debug_irq, cpu) = rc;
ee523ca1	135
3b16cf87 JA	136	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
	137	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
	138	cpu,
	139	xen_call_function_single_interrupt,
	140	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	141	callfunc_name,
	142	NULL);
	143	if (rc < 0)
	144	goto fail;
c6e22f9e	145	per_cpu(xen_callfuncsingle_irq, cpu) = rc;
3b16cf87	146
1ff2b0c3 LM	147	callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
	148	rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
	149	cpu,
	150	xen_irq_work_interrupt,
	151	IRQF_DISABLED\|IRQF_PERCPU\|IRQF_NOBALANCING,
	152	callfunc_name,
	153	NULL);
	154	if (rc < 0)
	155	goto fail;
	156	per_cpu(xen_irq_work, cpu) = rc;
	157
f87e4cac JF	158	return 0;
	159
	160	fail:
c6e22f9e TH	161	if (per_cpu(xen_resched_irq, cpu) >= 0)
	162	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	163	if (per_cpu(xen_callfunc_irq, cpu) >= 0)
	164	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	165	if (per_cpu(xen_debug_irq, cpu) >= 0)
	166	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	167	if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
	168	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
	169	NULL);
1ff2b0c3 LM	170	if (per_cpu(xen_irq_work, cpu) >= 0)
1ff2b0c3 LM	171	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
3b16cf87	172
f87e4cac JF	173	return rc;
	174	}
	175
c7b75947	176	static void __init xen_fill_possible_map(void)
f87e4cac JF	177	{
	178	int i, rc;
	179
ea5b8f73 SS	180	if (xen_initial_domain())
	181	return;
	182
	183	for (i = 0; i < nr_cpu_ids; i++) {
	184	rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
	185	if (rc >= 0) {
	186	num_processors++;
	187	set_cpu_possible(i, true);
	188	}
	189	}
	190	}
	191
	192	static void __init xen_filter_cpu_maps(void)
	193	{
	194	int i, rc;
cf405ae6	195	unsigned int subtract = 0;
ea5b8f73 SS	196
	197	if (!xen_initial_domain())
	198	return;
	199
801fd14a SS	200	num_processors = 0;
801fd14a SS	201	disabled_cpus = 0;
e7986739	202	for (i = 0; i < nr_cpu_ids; i++) {
f87e4cac	203	rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
4560a294 JF	204	if (rc >= 0) {
4560a294 JF	205	num_processors++;
4f062896	206	set_cpu_possible(i, true);
801fd14a SS	207	} else {
	208	set_cpu_possible(i, false);
	209	set_cpu_present(i, false);
cf405ae6	210	subtract++;
4560a294	211	}
f87e4cac	212	}
cf405ae6 KRW	213	#ifdef CONFIG_HOTPLUG_CPU
	214	/* This is akin to using 'nr_cpus' on the Linux command line.
	215	* Which is OK as when we use 'dom0_max_vcpus=X' we can only
	216	* have up to X, while nr_cpu_ids is greater than X. This
	217	* normally is not a problem, except when CPU hotplugging
	218	* is involved and then there might be more than X CPUs
	219	* in the guest - which will not work as there is no
	220	* hypercall to expand the max number of VCPUs an already
	221	* running guest has. So cap it up to X. */
	222	if (subtract)
	223	nr_cpu_ids = nr_cpu_ids - subtract;
	224	#endif
	225
f87e4cac JF	226	}
f87e4cac JF	227
a9e7062d	228	static void __init xen_smp_prepare_boot_cpu(void)
f87e4cac	229	{
f87e4cac JF	230	BUG_ON(smp_processor_id() != 0);
	231	native_smp_prepare_boot_cpu();
	232
f87e4cac JF	233	/* We've switched to the "real" per-cpu gdt, so make sure the
f87e4cac JF	234	old memory can be recycled */
38341432	235	make_lowmem_page_readwrite(xen_initial_gdt);
60223a32	236
ea5b8f73	237	xen_filter_cpu_maps();
60223a32	238	xen_setup_vcpu_info_placement();
f87e4cac JF	239	}
f87e4cac JF	240
a9e7062d	241	static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
f87e4cac JF	242	{
f87e4cac JF	243	unsigned cpu;
900cba88	244	unsigned int i;
f87e4cac	245
ed467e69 KRW	246	if (skip_ioapic_setup) {
	247	char *m = (max_cpus == 0) ?
	248	"The nosmp parameter is incompatible with Xen; " \
	249	"use Xen dom0_max_vcpus=1 parameter" :
	250	"The noapic parameter is incompatible with Xen";
	251
	252	xen_raw_printk(m);
	253	panic(m);
	254	}
2d9e1e2f JF	255	xen_init_lock_cpu(0);
2d9e1e2f JF	256
06d0b5d9	257	smp_store_boot_cpu_info();
c7b75947	258	cpu_data(0).x86_max_cores = 1;
900cba88 AJ	259
	260	for_each_possible_cpu(i) {
	261	zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
	262	zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
	263	zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
	264	}
f87e4cac JF	265	set_cpu_sibling_map(0);
	266
	267	if (xen_smp_intr_init(0))
	268	BUG();
	269
b78936e1 MT	270	if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
	271	panic("could not allocate xen_cpu_initialized_map\n");
	272
	273	cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
f87e4cac JF	274
	275	/* Restrict the possible_map according to max_cpus. */
	276	while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
e7986739	277	for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
f87e4cac	278	continue;
4f062896	279	set_cpu_possible(cpu, false);
f87e4cac JF	280	}
f87e4cac JF	281
7eb43a6d	282	for_each_possible_cpu(cpu)
4f062896	283	set_cpu_present(cpu, true);
f87e4cac JF	284	}
f87e4cac JF	285
b53cedeb	286	static int __cpuinit
f87e4cac JF	287	cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
	288	{
	289	struct vcpu_guest_context *ctxt;
c7b75947	290	struct desc_struct *gdt;
9976b39b	291	unsigned long gdt_mfn;
f87e4cac	292
b78936e1	293	if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
f87e4cac JF	294	return 0;
	295
	296	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
	297	if (ctxt == NULL)
	298	return -ENOMEM;
	299
c7b75947 JF	300	gdt = get_cpu_gdt_table(cpu);
c7b75947 JF	301
f87e4cac JF	302	ctxt->flags = VGCF_IN_KERNEL;
	303	ctxt->user_regs.ds = __USER_DS;
	304	ctxt->user_regs.es = __USER_DS;
f87e4cac	305	ctxt->user_regs.ss = __KERNEL_DS;
c7b75947 JF	306	#ifdef CONFIG_X86_32
c7b75947 JF	307	ctxt->user_regs.fs = __KERNEL_PERCPU;
577eebea	308	ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
795f99b6 JF	309	#else
795f99b6 JF	310	ctxt->gs_base_kernel = per_cpu_offset(cpu);
c7b75947	311	#endif
f87e4cac JF	312	ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
	313	ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
	314
	315	memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
	316
	317	xen_copy_trap_info(ctxt->trap_ctxt);
	318
	319	ctxt->ldt_ents = 0;
	320
c7b75947	321	BUG_ON((unsigned long)gdt & ~PAGE_MASK);
9976b39b JF	322
9976b39b JF	323	gdt_mfn = arbitrary_virt_to_mfn(gdt);
c7b75947	324	make_lowmem_page_readonly(gdt);
9976b39b	325	make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
f87e4cac	326
9976b39b	327	ctxt->gdt_frames[0] = gdt_mfn;
c7b75947	328	ctxt->gdt_ents = GDT_ENTRIES;
f87e4cac JF	329
f87e4cac JF	330	ctxt->user_regs.cs = __KERNEL_CS;
faca6227	331	ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
f87e4cac JF	332
f87e4cac JF	333	ctxt->kernel_ss = __KERNEL_DS;
faca6227	334	ctxt->kernel_sp = idle->thread.sp0;
f87e4cac	335
c7b75947	336	#ifdef CONFIG_X86_32
f87e4cac	337	ctxt->event_callback_cs = __KERNEL_CS;
f87e4cac	338	ctxt->failsafe_callback_cs = __KERNEL_CS;
c7b75947 JF	339	#endif
c7b75947 JF	340	ctxt->event_callback_eip = (unsigned long)xen_hypervisor_callback;
f87e4cac JF	341	ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback;
	342
	343	per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
	344	ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
	345
	346	if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
	347	BUG();
	348
	349	kfree(ctxt);
	350	return 0;
	351	}
	352
7eb43a6d	353	static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle)
f87e4cac	354	{
f87e4cac JF	355	int rc;
f87e4cac JF	356
c6f5e0ac	357	per_cpu(current_task, cpu) = idle;
c7b75947	358	#ifdef CONFIG_X86_32
f87e4cac	359	irq_ctx_init(cpu);
c7b75947	360	#else
c7b75947	361	clear_tsk_thread_flag(idle, TIF_FORK);
38341432 JF	362	per_cpu(kernel_stack, cpu) =
	363	(unsigned long)task_stack_page(idle) -
	364	KERNEL_STACK_OFFSET + THREAD_SIZE;
c7b75947	365	#endif
02889672	366	xen_setup_runstate_info(cpu);
f87e4cac	367	xen_setup_timer(cpu);
2d9e1e2f	368	xen_init_lock_cpu(cpu);
f87e4cac	369
c7b75947 JF	370	per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
c7b75947 JF	371
f87e4cac JF	372	/* make sure interrupts start blocked */
	373	per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
	374
	375	rc = cpu_initialize_context(cpu, idle);
	376	if (rc)
	377	return rc;
	378
	379	if (num_online_cpus() == 1)
816afe4f RR	380	/* Just in case we booted with a single CPU. */
816afe4f RR	381	alternatives_enable_smp();
f87e4cac JF	382
	383	rc = xen_smp_intr_init(cpu);
	384	if (rc)
	385	return rc;
	386
f87e4cac JF	387	rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
	388	BUG_ON(rc);
	389
c7b75947	390	while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
1207cf8e	391	HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
c7b75947 JF	392	barrier();
	393	}
	394
f87e4cac JF	395	return 0;
	396	}
	397
a9e7062d	398	static void xen_smp_cpus_done(unsigned int max_cpus)
f87e4cac JF	399	{
	400	}
	401
2737146b	402	#ifdef CONFIG_HOTPLUG_CPU
26fd1051	403	static int xen_cpu_disable(void)
d68d82af AN	404	{
	405	unsigned int cpu = smp_processor_id();
	406	if (cpu == 0)
	407	return -EBUSY;
	408
	409	cpu_disable_common();
	410
	411	load_cr3(swapper_pg_dir);
	412	return 0;
	413	}
	414
26fd1051	415	static void xen_cpu_die(unsigned int cpu)
d68d82af AN	416	{
	417	while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
	418	current->state = TASK_UNINTERRUPTIBLE;
	419	schedule_timeout(HZ/10);
	420	}
c6e22f9e TH	421	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	422	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	423	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	424	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
2f1bd67d	425	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
d68d82af AN	426	xen_uninit_lock_cpu(cpu);
d68d82af AN	427	xen_teardown_timer(cpu);
d68d82af AN	428	}
d68d82af AN	429
71709247	430	static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
d68d82af AN	431	{
	432	play_dead_common();
	433	HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
	434	cpu_bringup();
	435	}
	436
2737146b	437	#else /* !CONFIG_HOTPLUG_CPU */
26fd1051	438	static int xen_cpu_disable(void)
2737146b AN	439	{
	440	return -ENOSYS;
	441	}
	442
26fd1051	443	static void xen_cpu_die(unsigned int cpu)
2737146b AN	444	{
	445	BUG();
	446	}
	447
26fd1051	448	static void xen_play_dead(void)
2737146b AN	449	{
	450	BUG();
	451	}
	452
	453	#endif
f87e4cac JF	454	static void stop_self(void *v)
	455	{
	456	int cpu = smp_processor_id();
	457
	458	/* make sure we're not pinning something down */
	459	load_cr3(swapper_pg_dir);
	460	/* should set up a minimal gdt */
	461
086748e5 IC	462	set_cpu_online(cpu, false);
086748e5 IC	463
f87e4cac JF	464	HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
	465	BUG();
	466	}
	467
76fac077	468	static void xen_stop_other_cpus(int wait)
f87e4cac	469	{
76fac077	470	smp_call_function(stop_self, NULL, wait);
f87e4cac JF	471	}
f87e4cac JF	472
a9e7062d	473	static void xen_smp_send_reschedule(int cpu)
f87e4cac JF	474	{
	475	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
	476	}
	477
f447d56d BG	478	static void __xen_send_IPI_mask(const struct cpumask *mask,
f447d56d BG	479	int vector)
f87e4cac JF	480	{
	481	unsigned cpu;
	482
bcda016e	483	for_each_cpu_and(cpu, mask, cpu_online_mask)
f87e4cac JF	484	xen_send_IPI_one(cpu, vector);
	485	}
	486
bcda016e	487	static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
3b16cf87 JA	488	{
	489	int cpu;
	490
f447d56d	491	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
3b16cf87 JA	492
3b16cf87 JA	493	/* Make sure other vcpus get a chance to run if they need to. */
bcda016e	494	for_each_cpu(cpu, mask) {
3b16cf87	495	if (xen_vcpu_stolen(cpu)) {
1207cf8e	496	HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
3b16cf87 JA	497	break;
	498	}
	499	}
	500	}
	501
a9e7062d	502	static void xen_smp_send_call_function_single_ipi(int cpu)
3b16cf87	503	{
f447d56d	504	__xen_send_IPI_mask(cpumask_of(cpu),
e7986739	505	XEN_CALL_FUNCTION_SINGLE_VECTOR);
3b16cf87 JA	506	}
3b16cf87 JA	507
f447d56d BG	508	static inline int xen_map_vector(int vector)
	509	{
	510	int xen_vector;
	511
	512	switch (vector) {
	513	case RESCHEDULE_VECTOR:
	514	xen_vector = XEN_RESCHEDULE_VECTOR;
	515	break;
	516	case CALL_FUNCTION_VECTOR:
	517	xen_vector = XEN_CALL_FUNCTION_VECTOR;
	518	break;
	519	case CALL_FUNCTION_SINGLE_VECTOR:
	520	xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
	521	break;
1ff2b0c3 LM	522	case IRQ_WORK_VECTOR:
	523	xen_vector = XEN_IRQ_WORK_VECTOR;
	524	break;
f447d56d BG	525	default:
	526	xen_vector = -1;
	527	printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
	528	vector);
	529	}
	530
	531	return xen_vector;
	532	}
	533
	534	void xen_send_IPI_mask(const struct cpumask *mask,
	535	int vector)
	536	{
	537	int xen_vector = xen_map_vector(vector);
	538
	539	if (xen_vector >= 0)
	540	__xen_send_IPI_mask(mask, xen_vector);
	541	}
	542
	543	void xen_send_IPI_all(int vector)
	544	{
	545	int xen_vector = xen_map_vector(vector);
	546
	547	if (xen_vector >= 0)
	548	__xen_send_IPI_mask(cpu_online_mask, xen_vector);
	549	}
	550
	551	void xen_send_IPI_self(int vector)
	552	{
	553	int xen_vector = xen_map_vector(vector);
	554
	555	if (xen_vector >= 0)
	556	xen_send_IPI_one(smp_processor_id(), xen_vector);
	557	}
	558
	559	void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
	560	int vector)
	561	{
	562	unsigned cpu;
	563	unsigned int this_cpu = smp_processor_id();
	564
	565	if (!(num_online_cpus() > 1))
	566	return;
	567
	568	for_each_cpu_and(cpu, mask, cpu_online_mask) {
	569	if (this_cpu == cpu)
	570	continue;
	571
	572	xen_smp_send_call_function_single_ipi(cpu);
	573	}
	574	}
	575
	576	void xen_send_IPI_allbutself(int vector)
	577	{
	578	int xen_vector = xen_map_vector(vector);
	579
	580	if (xen_vector >= 0)
	581	xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector);
	582	}
	583
f87e4cac JF	584	static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
f87e4cac JF	585	{
f87e4cac	586	irq_enter();
3b16cf87	587	generic_smp_call_function_interrupt();
1b437c8c	588	inc_irq_stat(irq_call_count);
f87e4cac JF	589	irq_exit();
f87e4cac JF	590
f87e4cac JF	591	return IRQ_HANDLED;
	592	}
	593
3b16cf87	594	static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
f87e4cac	595	{
3b16cf87 JA	596	irq_enter();
3b16cf87 JA	597	generic_smp_call_function_single_interrupt();
1b437c8c	598	inc_irq_stat(irq_call_count);
3b16cf87	599	irq_exit();
f87e4cac	600
3b16cf87	601	return IRQ_HANDLED;
f87e4cac	602	}
a9e7062d	603
1ff2b0c3 LM	604	static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
	605	{
	606	irq_enter();
	607	irq_work_run();
	608	inc_irq_stat(apic_irq_work_irqs);
	609	irq_exit();
	610
	611	return IRQ_HANDLED;
	612	}
	613
b53cedeb	614	static const struct smp_ops xen_smp_ops __initconst = {
a9e7062d JF	615	.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
a9e7062d JF	616	.smp_prepare_cpus = xen_smp_prepare_cpus,
a9e7062d JF	617	.smp_cpus_done = xen_smp_cpus_done,
a9e7062d JF	618
d68d82af AN	619	.cpu_up = xen_cpu_up,
	620	.cpu_die = xen_cpu_die,
	621	.cpu_disable = xen_cpu_disable,
	622	.play_dead = xen_play_dead,
	623
76fac077	624	.stop_other_cpus = xen_stop_other_cpus,
a9e7062d JF	625	.smp_send_reschedule = xen_smp_send_reschedule,
	626
	627	.send_call_func_ipi = xen_smp_send_call_function_ipi,
	628	.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
	629	};
	630
	631	void __init xen_smp_init(void)
	632	{
	633	smp_ops = xen_smp_ops;
c7b75947	634	xen_fill_possible_map();
2d9e1e2f	635	xen_init_spinlocks();
a9e7062d	636	}
99bbb3a8 SS	637
	638	static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
	639	{
	640	native_smp_prepare_cpus(max_cpus);
	641	WARN_ON(xen_smp_intr_init(0));
	642
99bbb3a8	643	xen_init_lock_cpu(0);
99bbb3a8 SS	644	}
99bbb3a8 SS	645
5cdaf183	646	static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
99bbb3a8 SS	647	{
99bbb3a8 SS	648	int rc;
5cdaf183	649	rc = native_cpu_up(cpu, tidle);
99bbb3a8 SS	650	WARN_ON (xen_smp_intr_init(cpu));
	651	return rc;
	652	}
	653
	654	static void xen_hvm_cpu_die(unsigned int cpu)
	655	{
	656	unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
	657	unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
	658	unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
	659	unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
1ff2b0c3	660	unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL);
99bbb3a8 SS	661	native_cpu_die(cpu);
	662	}
	663
	664	void __init xen_hvm_smp_init(void)
	665	{
3c05c4be SS	666	if (!xen_have_vector_callback)
3c05c4be SS	667	return;
99bbb3a8 SS	668	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
	669	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
	670	smp_ops.cpu_up = xen_hvm_cpu_up;
	671	smp_ops.cpu_die = xen_hvm_cpu_die;
	672	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
	673	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
	674	}