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linux-sg2042/arch/ppc64/kernel/xics.c

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/*
* arch/ppc64/kernel/xics.c
*
* Copyright 2000 IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/radix-tree.h>
#include <linux/cpu.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/rtas.h>
#include <asm/xics.h>
#include <asm/hvcall.h>
#include <asm/machdep.h>
#include "i8259.h"
static unsigned int xics_startup(unsigned int irq);
static void xics_enable_irq(unsigned int irq);
static void xics_disable_irq(unsigned int irq);
static void xics_mask_and_ack_irq(unsigned int irq);
static void xics_end_irq(unsigned int irq);
static void xics_set_affinity(unsigned int irq_nr, cpumask_t cpumask);
struct hw_interrupt_type xics_pic = {
.typename = " XICS ",
.startup = xics_startup,
.enable = xics_enable_irq,
.disable = xics_disable_irq,
.ack = xics_mask_and_ack_irq,
.end = xics_end_irq,
.set_affinity = xics_set_affinity
};
struct hw_interrupt_type xics_8259_pic = {
.typename = " XICS/8259",
.ack = xics_mask_and_ack_irq,
};
/* This is used to map real irq numbers to virtual */
static struct radix_tree_root irq_map = RADIX_TREE_INIT(GFP_ATOMIC);
#define XICS_IPI 2
#define XICS_IRQ_SPURIOUS 0
/* Want a priority other than 0. Various HW issues require this. */
#define DEFAULT_PRIORITY 5
/*
* Mark IPIs as higher priority so we can take them inside interrupts that
* arent marked SA_INTERRUPT
*/
#define IPI_PRIORITY 4
struct xics_ipl {
union {
u32 word;
u8 bytes[4];
} xirr_poll;
union {
u32 word;
u8 bytes[4];
} xirr;
u32 dummy;
union {
u32 word;
u8 bytes[4];
} qirr;
};
static struct xics_ipl __iomem *xics_per_cpu[NR_CPUS];
static int xics_irq_8259_cascade = 0;
static int xics_irq_8259_cascade_real = 0;
static unsigned int default_server = 0xFF;
/* also referenced in smp.c... */
unsigned int default_distrib_server = 0;
unsigned int interrupt_server_size = 8;
/*
* XICS only has a single IPI, so encode the messages per CPU
*/
struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned;
/* RTAS service tokens */
int ibm_get_xive;
int ibm_set_xive;
int ibm_int_on;
int ibm_int_off;
typedef struct {
int (*xirr_info_get)(int cpu);
void (*xirr_info_set)(int cpu, int val);
void (*cppr_info)(int cpu, u8 val);
void (*qirr_info)(int cpu, u8 val);
} xics_ops;
/* SMP */
static int pSeries_xirr_info_get(int n_cpu)
{
return in_be32(&xics_per_cpu[n_cpu]->xirr.word);
}
static void pSeries_xirr_info_set(int n_cpu, int value)
{
out_be32(&xics_per_cpu[n_cpu]->xirr.word, value);
}
static void pSeries_cppr_info(int n_cpu, u8 value)
{
out_8(&xics_per_cpu[n_cpu]->xirr.bytes[0], value);
}
static void pSeries_qirr_info(int n_cpu, u8 value)
{
out_8(&xics_per_cpu[n_cpu]->qirr.bytes[0], value);
}
static xics_ops pSeries_ops = {
pSeries_xirr_info_get,
pSeries_xirr_info_set,
pSeries_cppr_info,
pSeries_qirr_info
};
static xics_ops *ops = &pSeries_ops;
/* LPAR */
static inline long plpar_eoi(unsigned long xirr)
{
return plpar_hcall_norets(H_EOI, xirr);
}
static inline long plpar_cppr(unsigned long cppr)
{
return plpar_hcall_norets(H_CPPR, cppr);
}
static inline long plpar_ipi(unsigned long servernum, unsigned long mfrr)
{
return plpar_hcall_norets(H_IPI, servernum, mfrr);
}
static inline long plpar_xirr(unsigned long *xirr_ret)
{
unsigned long dummy;
return plpar_hcall(H_XIRR, 0, 0, 0, 0, xirr_ret, &dummy, &dummy);
}
static int pSeriesLP_xirr_info_get(int n_cpu)
{
unsigned long lpar_rc;
unsigned long return_value;
lpar_rc = plpar_xirr(&return_value);
if (lpar_rc != H_Success)
panic(" bad return code xirr - rc = %lx \n", lpar_rc);
return (int)return_value;
}
static void pSeriesLP_xirr_info_set(int n_cpu, int value)
{
unsigned long lpar_rc;
unsigned long val64 = value & 0xffffffff;
lpar_rc = plpar_eoi(val64);
if (lpar_rc != H_Success)
panic("bad return code EOI - rc = %ld, value=%lx\n", lpar_rc,
val64);
}
void pSeriesLP_cppr_info(int n_cpu, u8 value)
{
unsigned long lpar_rc;
lpar_rc = plpar_cppr(value);
if (lpar_rc != H_Success)
panic("bad return code cppr - rc = %lx\n", lpar_rc);
}
static void pSeriesLP_qirr_info(int n_cpu , u8 value)
{
unsigned long lpar_rc;
lpar_rc = plpar_ipi(get_hard_smp_processor_id(n_cpu), value);
if (lpar_rc != H_Success)
panic("bad return code qirr - rc = %lx\n", lpar_rc);
}
xics_ops pSeriesLP_ops = {
pSeriesLP_xirr_info_get,
pSeriesLP_xirr_info_set,
pSeriesLP_cppr_info,
pSeriesLP_qirr_info
};
static unsigned int xics_startup(unsigned int virq)
{
unsigned int irq;
irq = irq_offset_down(virq);
if (radix_tree_insert(&irq_map, virt_irq_to_real(irq),
&virt_irq_to_real_map[irq]) == -ENOMEM)
printk(KERN_CRIT "Out of memory creating real -> virtual"
" IRQ mapping for irq %u (real 0x%x)\n",
virq, virt_irq_to_real(irq));
xics_enable_irq(virq);
return 0; /* return value is ignored */
}
static unsigned int real_irq_to_virt(unsigned int real_irq)
{
unsigned int *ptr;
ptr = radix_tree_lookup(&irq_map, real_irq);
if (ptr == NULL)
return NO_IRQ;
return ptr - virt_irq_to_real_map;
}
#ifdef CONFIG_SMP
static int get_irq_server(unsigned int irq)
{
unsigned int server;
/* For the moment only implement delivery to all cpus or one cpu */
cpumask_t cpumask = irq_affinity[irq];
cpumask_t tmp = CPU_MASK_NONE;
if (!distribute_irqs)
return default_server;
if (cpus_equal(cpumask, CPU_MASK_ALL)) {
server = default_distrib_server;
} else {
cpus_and(tmp, cpu_online_map, cpumask);
if (cpus_empty(tmp))
server = default_distrib_server;
else
server = get_hard_smp_processor_id(first_cpu(tmp));
}
return server;
}
#else
static int get_irq_server(unsigned int irq)
{
return default_server;
}
#endif
static void xics_enable_irq(unsigned int virq)
{
unsigned int irq;
int call_status;
unsigned int server;
irq = virt_irq_to_real(irq_offset_down(virq));
if (irq == XICS_IPI)
return;
server = get_irq_server(virq);
call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server,
DEFAULT_PRIORITY);
if (call_status != 0) {
printk(KERN_ERR "xics_enable_irq: irq=%d: ibm_set_xive "
"returned %x\n", irq, call_status);
return;
}
/* Now unmask the interrupt (often a no-op) */
call_status = rtas_call(ibm_int_on, 1, 1, NULL, irq);
if (call_status != 0) {
printk(KERN_ERR "xics_enable_irq: irq=%d: ibm_int_on "
"returned %x\n", irq, call_status);
return;
}
}
static void xics_disable_real_irq(unsigned int irq)
{
int call_status;
unsigned int server;
if (irq == XICS_IPI)
return;
call_status = rtas_call(ibm_int_off, 1, 1, NULL, irq);
if (call_status != 0) {
printk(KERN_ERR "xics_disable_real_irq: irq=%d: "
"ibm_int_off returned %x\n", irq, call_status);
return;
}
server = get_irq_server(irq);
/* Have to set XIVE to 0xff to be able to remove a slot */
call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, 0xff);
if (call_status != 0) {
printk(KERN_ERR "xics_disable_irq: irq=%d: ibm_set_xive(0xff)"
" returned %x\n", irq, call_status);
return;
}
}
static void xics_disable_irq(unsigned int virq)
{
unsigned int irq;
irq = virt_irq_to_real(irq_offset_down(virq));
xics_disable_real_irq(irq);
}
static void xics_end_irq(unsigned int irq)
{
int cpu = smp_processor_id();
iosync();
ops->xirr_info_set(cpu, ((0xff << 24) |
(virt_irq_to_real(irq_offset_down(irq)))));
}
static void xics_mask_and_ack_irq(unsigned int irq)
{
int cpu = smp_processor_id();
if (irq < irq_offset_value()) {
i8259_pic.ack(irq);
iosync();
ops->xirr_info_set(cpu, ((0xff<<24) |
xics_irq_8259_cascade_real));
iosync();
}
}
int xics_get_irq(struct pt_regs *regs)
{
unsigned int cpu = smp_processor_id();
unsigned int vec;
int irq;
vec = ops->xirr_info_get(cpu);
/* (vec >> 24) == old priority */
vec &= 0x00ffffff;
/* for sanity, this had better be < NR_IRQS - 16 */
if (vec == xics_irq_8259_cascade_real) {
irq = i8259_irq(cpu);
if (irq == -1) {
/* Spurious cascaded interrupt. Still must ack xics */
xics_end_irq(irq_offset_up(xics_irq_8259_cascade));
irq = -1;
}
} else if (vec == XICS_IRQ_SPURIOUS) {
irq = -1;
} else {
irq = real_irq_to_virt(vec);
if (irq == NO_IRQ)
irq = real_irq_to_virt_slowpath(vec);
if (irq == NO_IRQ) {
printk(KERN_ERR "Interrupt %d (real) is invalid,"
" disabling it.\n", vec);
xics_disable_real_irq(vec);
} else
irq = irq_offset_up(irq);
}
return irq;
}
#ifdef CONFIG_SMP
irqreturn_t xics_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
{
int cpu = smp_processor_id();
ops->qirr_info(cpu, 0xff);
WARN_ON(cpu_is_offline(cpu));
while (xics_ipi_message[cpu].value) {
if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION,
&xics_ipi_message[cpu].value)) {
mb();
smp_message_recv(PPC_MSG_CALL_FUNCTION, regs);
}
if (test_and_clear_bit(PPC_MSG_RESCHEDULE,
&xics_ipi_message[cpu].value)) {
mb();
smp_message_recv(PPC_MSG_RESCHEDULE, regs);
}
#if 0
if (test_and_clear_bit(PPC_MSG_MIGRATE_TASK,
&xics_ipi_message[cpu].value)) {
mb();
smp_message_recv(PPC_MSG_MIGRATE_TASK, regs);
}
#endif
#ifdef CONFIG_DEBUGGER
if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK,
&xics_ipi_message[cpu].value)) {
mb();
smp_message_recv(PPC_MSG_DEBUGGER_BREAK, regs);
}
#endif
}
return IRQ_HANDLED;
}
void xics_cause_IPI(int cpu)
{
ops->qirr_info(cpu, IPI_PRIORITY);
}
#endif /* CONFIG_SMP */
void xics_setup_cpu(void)
{
int cpu = smp_processor_id();
ops->cppr_info(cpu, 0xff);
iosync();
/*
* Put the calling processor into the GIQ. This is really only
* necessary from a secondary thread as the OF start-cpu interface
* performs this function for us on primary threads.
*
* XXX: undo of teardown on kexec needs this too, as may hotplug
*/
rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE,
(1UL << interrupt_server_size) - 1 - default_distrib_server, 1);
}
void xics_init_IRQ(void)
{
int i;
unsigned long intr_size = 0;
struct device_node *np;
uint *ireg, ilen, indx = 0;
unsigned long intr_base = 0;
struct xics_interrupt_node {
unsigned long addr;
unsigned long size;
} intnodes[NR_CPUS];
ppc64_boot_msg(0x20, "XICS Init");
ibm_get_xive = rtas_token("ibm,get-xive");
ibm_set_xive = rtas_token("ibm,set-xive");
ibm_int_on = rtas_token("ibm,int-on");
ibm_int_off = rtas_token("ibm,int-off");
np = of_find_node_by_type(NULL, "PowerPC-External-Interrupt-Presentation");
if (!np)
panic("xics_init_IRQ: can't find interrupt presentation");
nextnode:
ireg = (uint *)get_property(np, "ibm,interrupt-server-ranges", NULL);
if (ireg) {
/*
* set node starting index for this node
*/
indx = *ireg;
}
ireg = (uint *)get_property(np, "reg", &ilen);
if (!ireg)
panic("xics_init_IRQ: can't find interrupt reg property");
while (ilen) {
intnodes[indx].addr = (unsigned long)*ireg++ << 32;
ilen -= sizeof(uint);
intnodes[indx].addr |= *ireg++;
ilen -= sizeof(uint);
intnodes[indx].size = (unsigned long)*ireg++ << 32;
ilen -= sizeof(uint);
intnodes[indx].size |= *ireg++;
ilen -= sizeof(uint);
indx++;
if (indx >= NR_CPUS) break;
}
np = of_find_node_by_type(np, "PowerPC-External-Interrupt-Presentation");
if ((indx < NR_CPUS) && np) goto nextnode;
/* Find the server numbers for the boot cpu. */
for (np = of_find_node_by_type(NULL, "cpu");
np;
np = of_find_node_by_type(np, "cpu")) {
ireg = (uint *)get_property(np, "reg", &ilen);
if (ireg && ireg[0] == boot_cpuid_phys) {
ireg = (uint *)get_property(np, "ibm,ppc-interrupt-gserver#s",
&ilen);
i = ilen / sizeof(int);
if (ireg && i > 0) {
default_server = ireg[0];
default_distrib_server = ireg[i-1]; /* take last element */
}
ireg = (uint *)get_property(np,
"ibm,interrupt-server#-size", NULL);
if (ireg)
interrupt_server_size = *ireg;
break;
}
}
of_node_put(np);
intr_base = intnodes[0].addr;
intr_size = intnodes[0].size;
np = of_find_node_by_type(NULL, "interrupt-controller");
if (!np) {
printk(KERN_WARNING "xics: no ISA interrupt controller\n");
xics_irq_8259_cascade_real = -1;
xics_irq_8259_cascade = -1;
} else {
ireg = (uint *) get_property(np, "interrupts", NULL);
if (!ireg)
panic("xics_init_IRQ: can't find ISA interrupts property");
xics_irq_8259_cascade_real = *ireg;
xics_irq_8259_cascade
= virt_irq_create_mapping(xics_irq_8259_cascade_real);
of_node_put(np);
}
if (systemcfg->platform == PLATFORM_PSERIES) {
#ifdef CONFIG_SMP
for_each_cpu(i) {
int hard_id;
/* FIXME: Do this dynamically! --RR */
if (!cpu_present(i))
continue;
hard_id = get_hard_smp_processor_id(i);
xics_per_cpu[i] = ioremap(intnodes[hard_id].addr,
intnodes[hard_id].size);
}
#else
xics_per_cpu[0] = ioremap(intr_base, intr_size);
#endif /* CONFIG_SMP */
} else if (systemcfg->platform == PLATFORM_PSERIES_LPAR) {
ops = &pSeriesLP_ops;
}
xics_8259_pic.enable = i8259_pic.enable;
xics_8259_pic.disable = i8259_pic.disable;
for (i = 0; i < 16; ++i)
get_irq_desc(i)->handler = &xics_8259_pic;
for (; i < NR_IRQS; ++i)
get_irq_desc(i)->handler = &xics_pic;
xics_setup_cpu();
ppc64_boot_msg(0x21, "XICS Done");
}
/*
* We cant do this in init_IRQ because we need the memory subsystem up for
* request_irq()
*/
static int __init xics_setup_i8259(void)
{
if (ppc64_interrupt_controller == IC_PPC_XIC &&
xics_irq_8259_cascade != -1) {
if (request_irq(irq_offset_up(xics_irq_8259_cascade),
no_action, 0, "8259 cascade", NULL))
printk(KERN_ERR "xics_setup_i8259: couldn't get 8259 "
"cascade\n");
i8259_init(0);
}
return 0;
}
arch_initcall(xics_setup_i8259);
#ifdef CONFIG_SMP
void xics_request_IPIs(void)
{
virt_irq_to_real_map[XICS_IPI] = XICS_IPI;
/* IPIs are marked SA_INTERRUPT as they must run with irqs disabled */
request_irq(irq_offset_up(XICS_IPI), xics_ipi_action, SA_INTERRUPT,
"IPI", NULL);
get_irq_desc(irq_offset_up(XICS_IPI))->status |= IRQ_PER_CPU;
}
#endif
static void xics_set_affinity(unsigned int virq, cpumask_t cpumask)
{
unsigned int irq;
int status;
int xics_status[2];
unsigned long newmask;
cpumask_t tmp = CPU_MASK_NONE;
irq = virt_irq_to_real(irq_offset_down(virq));
if (irq == XICS_IPI || irq == NO_IRQ)
return;
status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq);
if (status) {
printk(KERN_ERR "xics_set_affinity: irq=%d ibm,get-xive "
"returns %d\n", irq, status);
return;
}
/* For the moment only implement delivery to all cpus or one cpu */
if (cpus_equal(cpumask, CPU_MASK_ALL)) {
newmask = default_distrib_server;
} else {
cpus_and(tmp, cpu_online_map, cpumask);
if (cpus_empty(tmp))
return;
newmask = get_hard_smp_processor_id(first_cpu(tmp));
}
status = rtas_call(ibm_set_xive, 3, 1, NULL,
irq, newmask, xics_status[1]);
if (status) {
printk(KERN_ERR "xics_set_affinity: irq=%d ibm,set-xive "
"returns %d\n", irq, status);
return;
}
}
void xics_teardown_cpu(void)
{
int cpu = smp_processor_id();
int status;
ops->cppr_info(cpu, 0x00);
iosync();
/*
* we need to EOI the IPI if we got here from kexec down IPI
*
* xics doesn't care if we duplicate an EOI as long as we
* don't EOI and raise priority.
*
* probably need to check all the other interrupts too
* should we be flagging idle loop instead?
* or creating some task to be scheduled?
*/
ops->xirr_info_set(cpu, XICS_IPI);
status = rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE,
(1UL << interrupt_server_size) - 1 - default_distrib_server, 0);
WARN_ON(status != 0);
}
#ifdef CONFIG_HOTPLUG_CPU
/* Interrupts are disabled. */
void xics_migrate_irqs_away(void)
{
int status;
unsigned int irq, virq, cpu = smp_processor_id();
/* Reject any interrupt that was queued to us... */
ops->cppr_info(cpu, 0);
iosync();
/* remove ourselves from the global interrupt queue */
status = rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE,
(1UL << interrupt_server_size) - 1 - default_distrib_server, 0);
WARN_ON(status < 0);
/* Allow IPIs again... */
ops->cppr_info(cpu, DEFAULT_PRIORITY);
iosync();
for_each_irq(virq) {
irq_desc_t *desc;
int xics_status[2];
unsigned long flags;
/* We cant set affinity on ISA interrupts */
if (virq < irq_offset_value())
continue;
desc = get_irq_desc(virq);
irq = virt_irq_to_real(irq_offset_down(virq));
/* We need to get IPIs still. */
if (irq == XICS_IPI || irq == NO_IRQ)
continue;
/* We only need to migrate enabled IRQS */
if (desc == NULL || desc->handler == NULL
|| desc->action == NULL
|| desc->handler->set_affinity == NULL)
continue;
spin_lock_irqsave(&desc->lock, flags);
status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq);
if (status) {
printk(KERN_ERR "migrate_irqs_away: irq=%d "
"ibm,get-xive returns %d\n",
virq, status);
goto unlock;
}
/*
* We only support delivery to all cpus or to one cpu.
* The irq has to be migrated only in the single cpu
* case.
*/
if (xics_status[0] != get_hard_smp_processor_id(cpu))
goto unlock;
printk(KERN_WARNING "IRQ %d affinity broken off cpu %u\n",
virq, cpu);
/* Reset affinity to all cpus */
desc->handler->set_affinity(virq, CPU_MASK_ALL);
irq_affinity[virq] = CPU_MASK_ALL;
unlock:
spin_unlock_irqrestore(&desc->lock, flags);
}
}
#endif
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