mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Davidlohr Bueso](/assets/img/avatar_default.png)
Call __set_current_state() instead of assigning the new state directly. These interfaces also aid CONFIG_DEBUG_ATOMIC_SLEEP environments, keeping track of who changed the state. Signed-off-by: Davidlohr Bueso <dbueso@suse.de> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
788 lines
19 KiB
C
788 lines
19 KiB
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 <linux/tick.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"
|
|
#include "smp.h"
|
|
|
|
cpumask_var_t xen_cpu_initialized_map;
|
|
|
|
struct xen_common_irq {
|
|
int irq;
|
|
char *name;
|
|
};
|
|
static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
|
|
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
|
|
static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
|
|
static DEFINE_PER_CPU(struct xen_common_irq, xen_irq_work) = { .irq = -1 };
|
|
static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .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 cpu_bringup(void)
|
|
{
|
|
int cpu;
|
|
|
|
cpu_init();
|
|
touch_softlockup_watchdog();
|
|
preempt_disable();
|
|
|
|
/* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
|
|
if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
|
|
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 */
|
|
}
|
|
|
|
/*
|
|
* Note: cpu parameter is only relevant for PVH. The reason for passing it
|
|
* is we can't do smp_processor_id until the percpu segments are loaded, for
|
|
* which we need the cpu number! So we pass it in rdi as first parameter.
|
|
*/
|
|
asmlinkage __visible void cpu_bringup_and_idle(int cpu)
|
|
{
|
|
#ifdef CONFIG_XEN_PVH
|
|
if (xen_feature(XENFEAT_auto_translated_physmap) &&
|
|
xen_feature(XENFEAT_supervisor_mode_kernel))
|
|
xen_pvh_secondary_vcpu_init(cpu);
|
|
#endif
|
|
cpu_bringup();
|
|
cpu_startup_entry(CPUHP_ONLINE);
|
|
}
|
|
|
|
static void xen_smp_intr_free(unsigned int cpu)
|
|
{
|
|
if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
|
|
unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
|
|
per_cpu(xen_resched_irq, cpu).irq = -1;
|
|
kfree(per_cpu(xen_resched_irq, cpu).name);
|
|
per_cpu(xen_resched_irq, cpu).name = NULL;
|
|
}
|
|
if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
|
|
unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
|
|
per_cpu(xen_callfunc_irq, cpu).irq = -1;
|
|
kfree(per_cpu(xen_callfunc_irq, cpu).name);
|
|
per_cpu(xen_callfunc_irq, cpu).name = NULL;
|
|
}
|
|
if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
|
|
unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
|
|
per_cpu(xen_debug_irq, cpu).irq = -1;
|
|
kfree(per_cpu(xen_debug_irq, cpu).name);
|
|
per_cpu(xen_debug_irq, cpu).name = NULL;
|
|
}
|
|
if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
|
|
unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
|
|
NULL);
|
|
per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
|
|
kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
|
|
per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
|
|
}
|
|
if (xen_hvm_domain())
|
|
return;
|
|
|
|
if (per_cpu(xen_irq_work, cpu).irq >= 0) {
|
|
unbind_from_irqhandler(per_cpu(xen_irq_work, cpu).irq, NULL);
|
|
per_cpu(xen_irq_work, cpu).irq = -1;
|
|
kfree(per_cpu(xen_irq_work, cpu).name);
|
|
per_cpu(xen_irq_work, cpu).name = NULL;
|
|
}
|
|
};
|
|
static int xen_smp_intr_init(unsigned int cpu)
|
|
{
|
|
int rc;
|
|
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_PERCPU|IRQF_NOBALANCING,
|
|
resched_name,
|
|
NULL);
|
|
if (rc < 0)
|
|
goto fail;
|
|
per_cpu(xen_resched_irq, cpu).irq = rc;
|
|
per_cpu(xen_resched_irq, cpu).name = resched_name;
|
|
|
|
callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
|
|
rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
|
|
cpu,
|
|
xen_call_function_interrupt,
|
|
IRQF_PERCPU|IRQF_NOBALANCING,
|
|
callfunc_name,
|
|
NULL);
|
|
if (rc < 0)
|
|
goto fail;
|
|
per_cpu(xen_callfunc_irq, cpu).irq = rc;
|
|
per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
|
|
|
|
debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
|
|
rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
|
|
IRQF_PERCPU | IRQF_NOBALANCING,
|
|
debug_name, NULL);
|
|
if (rc < 0)
|
|
goto fail;
|
|
per_cpu(xen_debug_irq, cpu).irq = rc;
|
|
per_cpu(xen_debug_irq, cpu).name = debug_name;
|
|
|
|
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_PERCPU|IRQF_NOBALANCING,
|
|
callfunc_name,
|
|
NULL);
|
|
if (rc < 0)
|
|
goto fail;
|
|
per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
|
|
per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
|
|
|
|
/*
|
|
* The IRQ worker on PVHVM goes through the native path and uses the
|
|
* IPI mechanism.
|
|
*/
|
|
if (xen_hvm_domain())
|
|
return 0;
|
|
|
|
callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu);
|
|
rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR,
|
|
cpu,
|
|
xen_irq_work_interrupt,
|
|
IRQF_PERCPU|IRQF_NOBALANCING,
|
|
callfunc_name,
|
|
NULL);
|
|
if (rc < 0)
|
|
goto fail;
|
|
per_cpu(xen_irq_work, cpu).irq = rc;
|
|
per_cpu(xen_irq_work, cpu).name = callfunc_name;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
xen_smp_intr_free(cpu);
|
|
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();
|
|
|
|
if (xen_pv_domain()) {
|
|
if (!xen_feature(XENFEAT_writable_page_tables))
|
|
/* 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);
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* Xen starts us with XEN_FLAT_RING1_DS, but linux code
|
|
* expects __USER_DS
|
|
*/
|
|
loadsegment(ds, __USER_DS);
|
|
loadsegment(es, __USER_DS);
|
|
#endif
|
|
|
|
xen_filter_cpu_maps();
|
|
xen_setup_vcpu_info_placement();
|
|
}
|
|
/*
|
|
* The alternative logic (which patches the unlock/lock) runs before
|
|
* the smp bootup up code is activated. Hence we need to set this up
|
|
* the core kernel is being patched. Otherwise we will have only
|
|
* modules patched but not core code.
|
|
*/
|
|
xen_init_spinlocks();
|
|
}
|
|
|
|
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
|
|
cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
struct vcpu_guest_context *ctxt;
|
|
struct desc_struct *gdt;
|
|
unsigned long gdt_mfn;
|
|
|
|
/* used to tell cpu_init() that it can proceed with initialization */
|
|
cpumask_set_cpu(cpu, cpu_callout_mask);
|
|
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);
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* Note: PVH is not yet supported on x86_32. */
|
|
ctxt->user_regs.fs = __KERNEL_PERCPU;
|
|
ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
|
|
#endif
|
|
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
|
|
|
|
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
|
|
ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
|
|
ctxt->flags = VGCF_IN_KERNEL;
|
|
ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
|
|
ctxt->user_regs.ds = __USER_DS;
|
|
ctxt->user_regs.es = __USER_DS;
|
|
ctxt->user_regs.ss = __KERNEL_DS;
|
|
|
|
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->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;
|
|
#else
|
|
ctxt->gs_base_kernel = per_cpu_offset(cpu);
|
|
#endif
|
|
ctxt->event_callback_eip =
|
|
(unsigned long)xen_hypervisor_callback;
|
|
ctxt->failsafe_callback_eip =
|
|
(unsigned long)xen_failsafe_callback;
|
|
ctxt->user_regs.cs = __KERNEL_CS;
|
|
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
|
|
}
|
|
#ifdef CONFIG_XEN_PVH
|
|
else {
|
|
/*
|
|
* The vcpu comes on kernel page tables which have the NX pte
|
|
* bit set. This means before DS/SS is touched, NX in
|
|
* EFER must be set. Hence the following assembly glue code.
|
|
*/
|
|
ctxt->user_regs.eip = (unsigned long)xen_pvh_early_cpu_init;
|
|
ctxt->user_regs.rdi = cpu;
|
|
ctxt->user_regs.rsi = true; /* entry == true */
|
|
}
|
|
#endif
|
|
ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
|
|
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 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);
|
|
#endif
|
|
per_cpu(kernel_stack, cpu) =
|
|
(unsigned long)task_stack_page(idle) -
|
|
KERNEL_STACK_OFFSET + THREAD_SIZE;
|
|
|
|
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 (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
|
|
__set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule_timeout(HZ/10);
|
|
}
|
|
|
|
cpu_die_common(cpu);
|
|
|
|
xen_smp_intr_free(cpu);
|
|
xen_uninit_lock_cpu(cpu);
|
|
xen_teardown_timer(cpu);
|
|
}
|
|
|
|
static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
|
|
{
|
|
play_dead_common();
|
|
HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
|
|
cpu_bringup();
|
|
/*
|
|
* commit 4b0c0f294 (tick: Cleanup NOHZ per cpu data on cpu down)
|
|
* clears certain data that the cpu_idle loop (which called us
|
|
* and that we return from) expects. The only way to get that
|
|
* data back is to call:
|
|
*/
|
|
tick_nohz_idle_enter();
|
|
}
|
|
|
|
#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;
|
|
#ifdef CONFIG_X86_64
|
|
case NMI_VECTOR:
|
|
case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
|
|
xen_vector = XEN_NMI_VECTOR;
|
|
break;
|
|
#endif
|
|
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();
|
|
int xen_vector = xen_map_vector(vector);
|
|
|
|
if (!(num_online_cpus() > 1) || (xen_vector < 0))
|
|
return;
|
|
|
|
for_each_cpu_and(cpu, mask, cpu_online_mask) {
|
|
if (this_cpu == cpu)
|
|
continue;
|
|
|
|
xen_send_IPI_one(cpu, xen_vector);
|
|
}
|
|
}
|
|
|
|
void xen_send_IPI_allbutself(int vector)
|
|
{
|
|
xen_send_IPI_mask_allbutself(cpu_online_mask, 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();
|
|
}
|
|
|
|
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 xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle)
|
|
{
|
|
int rc;
|
|
/*
|
|
* xen_smp_intr_init() needs to run before native_cpu_up()
|
|
* so that IPI vectors are set up on the booting CPU before
|
|
* it is marked online in native_cpu_up().
|
|
*/
|
|
rc = xen_smp_intr_init(cpu);
|
|
WARN_ON(rc);
|
|
if (!rc)
|
|
rc = native_cpu_up(cpu, tidle);
|
|
|
|
/*
|
|
* We must initialize the slowpath CPU kicker _after_ the native
|
|
* path has executed. If we initialized it before none of the
|
|
* unlocker IPI kicks would reach the booting CPU as the booting
|
|
* CPU had not set itself 'online' in cpu_online_mask. That mask
|
|
* is checked when IPIs are sent (on HVM at least).
|
|
*/
|
|
xen_init_lock_cpu(cpu);
|
|
return rc;
|
|
}
|
|
|
|
static void xen_hvm_cpu_die(unsigned int cpu)
|
|
{
|
|
xen_cpu_die(cpu);
|
|
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;
|
|
smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu;
|
|
}
|