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/*
* Copyright 2004 James Cleverdon, IBM.
* Subject to the GNU Public License, v.2
*
* Xen APIC subarch code. Maximum 8 CPUs, logical delivery.
*
* Hacked for x86-64 by James Cleverdon from i386 architecture code by
* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
* James Cleverdon.
*
* Hacked to pieces for Xen by Chris Wright.
*/
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/init.h>
#ifdef CONFIG_XEN_PRIVILEGED_GUEST
#include <asm/smp.h>
#include <asm/ipi.h>
#else
#include <asm/apic.h>
#include <asm/apicdef.h>
#include <asm/genapic.h>
#endif
#include <xen/evtchn.h>
DECLARE_PER_CPU(int, ipi_to_irq[NR_IPIS]);
static inline void __send_IPI_one(unsigned int cpu, int vector)
{
int irq = per_cpu(ipi_to_irq, cpu)[vector];
BUG_ON(irq < 0);
notify_remote_via_irq(irq);
}
void xen_send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest)
{
int cpu;
switch (shortcut) {
case APIC_DEST_SELF:
__send_IPI_one(smp_processor_id(), vector);
break;
case APIC_DEST_ALLBUT:
for (cpu = 0; cpu < NR_CPUS; ++cpu) {
if (cpu == smp_processor_id())
continue;
if (cpu_isset(cpu, cpu_online_map)) {
__send_IPI_one(cpu, vector);
}
}
break;
case APIC_DEST_ALLINC:
for (cpu = 0; cpu < NR_CPUS; ++cpu) {
if (cpu_isset(cpu, cpu_online_map)) {
__send_IPI_one(cpu, vector);
}
}
break;
default:
printk("XXXXXX __send_IPI_shortcut %08x vector %d\n", shortcut,
vector);
break;
}
}
static cpumask_t xen_target_cpus(void)
{
return cpu_online_map;
}
/*
* Set up the logical destination ID.
* Do nothing, not called now.
*/
static void xen_init_apic_ldr(void)
{
Dprintk("%s\n", __FUNCTION__);
return;
}
static void xen_send_IPI_allbutself(int vector)
{
/*
* if there are no other CPUs in the system then
* we get an APIC send error if we try to broadcast.
* thus we have to avoid sending IPIs in this case.
*/
Dprintk("%s\n", __FUNCTION__);
if (num_online_cpus() > 1)
xen_send_IPI_shortcut(APIC_DEST_ALLBUT, vector, APIC_DEST_LOGICAL);
}
static void xen_send_IPI_all(int vector)
{
Dprintk("%s\n", __FUNCTION__);
xen_send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
}
static void xen_send_IPI_mask(cpumask_t cpumask, int vector)
{
unsigned long mask = cpus_addr(cpumask)[0];
unsigned int cpu;
unsigned long flags;
Dprintk("%s\n", __FUNCTION__);
local_irq_save(flags);
WARN_ON(mask & ~cpus_addr(cpu_online_map)[0]);
for (cpu = 0; cpu < NR_CPUS; ++cpu) {
if (cpu_isset(cpu, cpumask)) {
__send_IPI_one(cpu, vector);
}
}
local_irq_restore(flags);
}
#ifdef CONFIG_XEN_PRIVILEGED_GUEST
static int xen_apic_id_registered(void)
{
/* better be set */
Dprintk("%s\n", __FUNCTION__);
return physid_isset(smp_processor_id(), phys_cpu_present_map);
}
#endif
static unsigned int xen_cpu_mask_to_apicid(cpumask_t cpumask)
{
Dprintk("%s\n", __FUNCTION__);
return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
}
static unsigned int phys_pkg_id(int index_msb)
{
u32 ebx;
Dprintk("%s\n", __FUNCTION__);
ebx = cpuid_ebx(1);
return ((ebx >> 24) & 0xFF) >> index_msb;
}
struct genapic apic_xen = {
.name = "xen",
#ifdef CONFIG_XEN_PRIVILEGED_GUEST
.int_delivery_mode = dest_LowestPrio,
#endif
.int_dest_mode = (APIC_DEST_LOGICAL != 0),
.int_delivery_dest = APIC_DEST_LOGICAL | APIC_DM_LOWEST,
.target_cpus = xen_target_cpus,
#ifdef CONFIG_XEN_PRIVILEGED_GUEST
.apic_id_registered = xen_apic_id_registered,
#endif
.init_apic_ldr = xen_init_apic_ldr,
.send_IPI_all = xen_send_IPI_all,
.send_IPI_allbutself = xen_send_IPI_allbutself,
.send_IPI_mask = xen_send_IPI_mask,
.cpu_mask_to_apicid = xen_cpu_mask_to_apicid,
.phys_pkg_id = phys_pkg_id,
};
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