i386: move xen

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 404 deletions

diff --git a/arch/i386/xen/smp.c b/arch/i386/xen/smp.c
deleted file mode 100644
index 557b8e2..0000000
--- a/arch/i386/xen/smp.c
+++ /dev/null
@@ -1,404 +0,0 @@
-/*
- * 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.
- *
- * This does not handle HOTPLUG_CPU yet.
- */
-#include <linux/sched.h>
-#include <linux/err.h>
-#include <linux/smp.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/page.h>
-#include <xen/events.h>
-
-#include "xen-ops.h"
-#include "mmu.h"
-
-static cpumask_t cpu_initialized_map;
-static DEFINE_PER_CPU(int, resched_irq);
-static DEFINE_PER_CPU(int, callfunc_irq);
-
-/*
- * Structure and data for smp_call_function(). This is designed to minimise
- * static memory requirements. It also looks cleaner.
- */
-static DEFINE_SPINLOCK(call_lock);
-
-struct call_data_struct {
-	void (*func) (void *info);
-	void *info;
-	atomic_t started;
-	atomic_t finished;
-	int wait;
-};
-
-static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
-
-static struct call_data_struct *call_data;
-
-/*
- * Reschedule call back. Nothing to do,
- * all the work is done automatically when
- * we return from the interrupt.
- */
-static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
-{
-	return IRQ_HANDLED;
-}
-
-static __cpuinit void cpu_bringup_and_idle(void)
-{
-	int cpu = smp_processor_id();
-
-	cpu_init();
-
-	preempt_disable();
-	per_cpu(cpu_state, cpu) = CPU_ONLINE;
-
-	xen_setup_cpu_clockevents();
-
-	/* We can take interrupts now: we're officially "up". */
-	local_irq_enable();
-
-	wmb();			/* make sure everything is out */
-	cpu_idle();
-}
-
-static int xen_smp_intr_init(unsigned int cpu)
-{
-	int rc;
-	const char *resched_name, *callfunc_name;
-
-	per_cpu(resched_irq, cpu) = per_cpu(callfunc_irq, cpu) = -1;
-
-	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(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(callfunc_irq, cpu) = rc;
-
-	return 0;
-
- fail:
-	if (per_cpu(resched_irq, cpu) >= 0)
-		unbind_from_irqhandler(per_cpu(resched_irq, cpu), NULL);
-	if (per_cpu(callfunc_irq, cpu) >= 0)
-		unbind_from_irqhandler(per_cpu(callfunc_irq, cpu), NULL);
-	return rc;
-}
-
-void __init xen_fill_possible_map(void)
-{
-	int i, rc;
-
-	for (i = 0; i < NR_CPUS; i++) {
-		rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
-		if (rc >= 0)
-			cpu_set(i, cpu_possible_map);
-	}
-}
-
-void __init xen_smp_prepare_boot_cpu(void)
-{
-	int cpu;
-
-	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(&per_cpu__gdt_page);
-
-	for (cpu = 0; cpu < NR_CPUS; cpu++) {
-		cpus_clear(cpu_sibling_map[cpu]);
-		cpus_clear(cpu_core_map[cpu]);
-	}
-
-	xen_setup_vcpu_info_placement();
-}
-
-void __init xen_smp_prepare_cpus(unsigned int max_cpus)
-{
-	unsigned cpu;
-
-	for (cpu = 0; cpu < NR_CPUS; cpu++) {
-		cpus_clear(cpu_sibling_map[cpu]);
-		cpus_clear(cpu_core_map[cpu]);
-	}
-
-	smp_store_cpu_info(0);
-	set_cpu_sibling_map(0);
-
-	if (xen_smp_intr_init(0))
-		BUG();
-
-	cpu_initialized_map = cpumask_of_cpu(0);
-
-	/* Restrict the possible_map according to max_cpus. */
-	while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
-		for (cpu = NR_CPUS-1; !cpu_isset(cpu, cpu_possible_map); cpu--)
-			continue;
-		cpu_clear(cpu, cpu_possible_map);
-	}
-
-	for_each_possible_cpu (cpu) {
-		struct task_struct *idle;
-
-		if (cpu == 0)
-			continue;
-
-		idle = fork_idle(cpu);
-		if (IS_ERR(idle))
-			panic("failed fork for CPU %d", cpu);
-
-		cpu_set(cpu, cpu_present_map);
-	}
-
-	//init_xenbus_allowed_cpumask();
-}
-
-static __cpuinit int
-cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
-{
-	struct vcpu_guest_context *ctxt;
-	struct gdt_page *gdt = &per_cpu(gdt_page, cpu);
-
-	if (cpu_test_and_set(cpu, cpu_initialized_map))
-		return 0;
-
-	ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
-	if (ctxt == NULL)
-		return -ENOMEM;
-
-	ctxt->flags = VGCF_IN_KERNEL;
-	ctxt->user_regs.ds = __USER_DS;
-	ctxt->user_regs.es = __USER_DS;
-	ctxt->user_regs.fs = __KERNEL_PERCPU;
-	ctxt->user_regs.gs = 0;
-	ctxt->user_regs.ss = __KERNEL_DS;
-	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->gdt & ~PAGE_MASK);
-	make_lowmem_page_readonly(gdt->gdt);
-
-	ctxt->gdt_frames[0] = virt_to_mfn(gdt->gdt);
-	ctxt->gdt_ents      = ARRAY_SIZE(gdt->gdt);
-
-	ctxt->user_regs.cs = __KERNEL_CS;
-	ctxt->user_regs.esp = idle->thread.esp0 - sizeof(struct pt_regs);
-
-	ctxt->kernel_ss = __KERNEL_DS;
-	ctxt->kernel_sp = idle->thread.esp0;
-
-	ctxt->event_callback_cs     = __KERNEL_CS;
-	ctxt->event_callback_eip    = (unsigned long)xen_hypervisor_callback;
-	ctxt->failsafe_callback_cs  = __KERNEL_CS;
-	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;
-}
-
-int __cpuinit xen_cpu_up(unsigned int cpu)
-{
-	struct task_struct *idle = idle_task(cpu);
-	int rc;
-
-#if 0
-	rc = cpu_up_check(cpu);
-	if (rc)
-		return rc;
-#endif
-
-	init_gdt(cpu);
-	per_cpu(current_task, cpu) = idle;
-	irq_ctx_init(cpu);
-	xen_setup_timer(cpu);
-
-	/* 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)
-		alternatives_smp_switch(1);
-
-	rc = xen_smp_intr_init(cpu);
-	if (rc)
-		return rc;
-
-	smp_store_cpu_info(cpu);
-	set_cpu_sibling_map(cpu);
-	/* This must be done before setting cpu_online_map */
-	wmb();
-
-	cpu_set(cpu, cpu_online_map);
-
-	rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
-	BUG_ON(rc);
-
-	return 0;
-}
-
-void xen_smp_cpus_done(unsigned int max_cpus)
-{
-}
-
-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 */
-
-	HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
-	BUG();
-}
-
-void xen_smp_send_stop(void)
-{
-	smp_call_function(stop_self, NULL, 0, 0);
-}
-
-void xen_smp_send_reschedule(int cpu)
-{
-	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
-}
-
-
-static void xen_send_IPI_mask(cpumask_t mask, enum ipi_vector vector)
-{
-	unsigned cpu;
-
-	cpus_and(mask, mask, cpu_online_map);
-
-	for_each_cpu_mask(cpu, mask)
-		xen_send_IPI_one(cpu, vector);
-}
-
-static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
-{
-	void (*func) (void *info) = call_data->func;
-	void *info = call_data->info;
-	int wait = call_data->wait;
-
-	/*
-	 * Notify initiating CPU that I've grabbed the data and am
-	 * about to execute the function
-	 */
-	mb();
-	atomic_inc(&call_data->started);
-	/*
-	 * At this point the info structure may be out of scope unless wait==1
-	 */
-	irq_enter();
-	(*func)(info);
-	irq_exit();
-
-	if (wait) {
-		mb();		/* commit everything before setting finished */
-		atomic_inc(&call_data->finished);
-	}
-
-	return IRQ_HANDLED;
-}
-
-int xen_smp_call_function_mask(cpumask_t mask, void (*func)(void *),
-			       void *info, int wait)
-{
-	struct call_data_struct data;
-	int cpus;
-
-	/* Holding any lock stops cpus from going down. */
-	spin_lock(&call_lock);
-
-	cpu_clear(smp_processor_id(), mask);
-
-	cpus = cpus_weight(mask);
-	if (!cpus) {
-		spin_unlock(&call_lock);
-		return 0;
-	}
-
-	/* Can deadlock when called with interrupts disabled */
-	WARN_ON(irqs_disabled());
-
-	data.func = func;
-	data.info = info;
-	atomic_set(&data.started, 0);
-	data.wait = wait;
-	if (wait)
-		atomic_set(&data.finished, 0);
-
-	call_data = &data;
-	mb();			/* write everything before IPI */
-
-	/* Send a message to other CPUs and wait for them to respond */
-	xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
-
-	/* Make sure other vcpus get a chance to run.
-	   XXX too severe?  Maybe we should check the other CPU's states? */
-	HYPERVISOR_sched_op(SCHEDOP_yield, 0);
-
-	/* Wait for response */
-	while (atomic_read(&data.started) != cpus ||
-	       (wait && atomic_read(&data.finished) != cpus))
-		cpu_relax();
-
-	spin_unlock(&call_lock);
-
-	return 0;
-}