// SPDX-License-Identifier: GPL-2.0-only
/*
* PS3 interrupt routines .
*
* Copyright ( C ) 2006 Sony Computer Entertainment Inc .
* Copyright 2006 Sony Corp .
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <asm /machdep.h>
#include <asm /udbg.h>
#include <asm /lv1call.h>
#include <asm /smp.h>
#include "platform.h"
#if defined (DEBUG)
#define DBG udbg_printf
#define FAIL udbg_printf
#else
#define DBG pr_devel
#define FAIL pr_debug
#endif
/**
* struct ps3_bmp - a per cpu irq status and mask bitmap structure
* @ status : 256 bit status bitmap indexed by plug
* @ unused_1 : Alignment
* @ mask : 256 bit mask bitmap indexed by plug
* @ unused_2 : Alignment
*
* The HV maintains per SMT thread mappings of HV outlet to HV plug on
* behalf of the guest . These mappings are implemented as 256 bit guest
* supplied bitmaps indexed by plug number . The addresses of the bitmaps
* are registered with the HV through lv1_configure_irq_state_bitmap ( ) .
* The HV requires that the 512 bits of status + mask not cross a page
* boundary . PS3_BMP_MINALIGN is used to define this minimal 64 byte
* alignment .
*
* The HV supports 256 plugs per thread , assigned as { 0 . . 255 } , for a total
* of 512 plugs supported on a processor . To simplify the logic this
* implementation equates HV plug value to Linux virq value , constrains each
* interrupt to have a system wide unique plug number , and limits the range
* of the plug values to map into the first dword of the bitmaps . This
* gives a usable range of plug values of { NR_IRQS_LEGACY . . 63 } . Note
* that there is no constraint on how many in this set an individual thread
* can acquire .
*
* The mask is declared as unsigned long so we can use set / clear_bit on it .
*/
#define PS3_BMP_MINALIGN 64
struct ps3_bmp {
struct {
u64 status;
u64 unused_1[3 ];
unsigned long mask;
u64 unused_2[3 ];
};
};
/**
* struct ps3_private - a per cpu data structure
* @ bmp : ps3_bmp structure
* @ bmp_lock : Synchronize access to bmp .
* @ ipi_debug_brk_mask : Mask for debug break IPIs
* @ ppe_id : HV logical_ppe_id
* @ thread_id : HV thread_id
* @ ipi_mask : Mask of IPI virqs
*/
struct ps3_private {
struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
spinlock_t bmp_lock;
u64 ppe_id;
u64 thread_id;
unsigned long ipi_debug_brk_mask;
unsigned long ipi_mask;
};
static DEFINE_PER_CPU(struct ps3_private, ps3_private);
/**
* ps3_chip_mask - Set an interrupt mask bit in ps3_bmp .
* @ virq : The assigned Linux virq .
*
* Sets ps3_bmp . mask and calls lv1_did_update_interrupt_mask ( ) .
*/
static void ps3_chip_mask(struct irq_data *d)
{
struct ps3_private *pd = irq_data_get_irq_chip_data(d);
unsigned long flags;
DBG("%s:%d: thread_id %llu, virq %d\n" , __func__, __LINE__,
pd->thread_id, d->irq);
local_irq_save(flags);
clear_bit(63 - d->irq, &pd->bmp.mask);
lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
local_irq_restore(flags);
}
/**
* ps3_chip_unmask - Clear an interrupt mask bit in ps3_bmp .
* @ virq : The assigned Linux virq .
*
* Clears ps3_bmp . mask and calls lv1_did_update_interrupt_mask ( ) .
*/
static void ps3_chip_unmask(struct irq_data *d)
{
struct ps3_private *pd = irq_data_get_irq_chip_data(d);
unsigned long flags;
DBG("%s:%d: thread_id %llu, virq %d\n" , __func__, __LINE__,
pd->thread_id, d->irq);
local_irq_save(flags);
set_bit(63 - d->irq, &pd->bmp.mask);
lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
local_irq_restore(flags);
}
/**
* ps3_chip_eoi - HV end - of - interrupt .
* @ virq : The assigned Linux virq .
*
* Calls lv1_end_of_interrupt_ext ( ) .
*/
static void ps3_chip_eoi(struct irq_data *d)
{
const struct ps3_private *pd = irq_data_get_irq_chip_data(d);
/* non-IPIs are EOIed here. */
if (!test_bit(63 - d->irq, &pd->ipi_mask))
lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, d->irq);
}
/**
* ps3_irq_chip - Represents the ps3_bmp as a Linux struct irq_chip .
*/
static struct irq_chip ps3_irq_chip = {
.name = "ps3" ,
.irq_mask = ps3_chip_mask,
.irq_unmask = ps3_chip_unmask,
.irq_eoi = ps3_chip_eoi,
};
/**
* ps3_virq_setup - virq related setup .
* @ cpu : enum ps3_cpu_binding indicating the cpu the interrupt should be
* serviced on .
* @ outlet : The HV outlet from the various create outlet routines .
* @ virq : The assigned Linux virq .
*
* Calls irq_create_mapping ( ) to get a virq and sets the chip data to
* ps3_private data .
*/
static int ps3_virq_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
unsigned int *virq)
{
int result;
struct ps3_private *pd;
/* This defines the default interrupt distribution policy. */
if (cpu == PS3_BINDING_CPU_ANY)
cpu = 0 ;
pd = &per_cpu(ps3_private, cpu);
*virq = irq_create_mapping(NULL, outlet);
if (!*virq) {
FAIL("%s:%d: irq_create_mapping failed: outlet %lu\n" ,
__func__, __LINE__, outlet);
result = -ENOMEM;
goto fail_create;
}
DBG("%s:%d: outlet %lu => cpu %u, virq %u\n" , __func__, __LINE__,
outlet, cpu, *virq);
result = irq_set_chip_data(*virq, pd);
if (result) {
FAIL("%s:%d: irq_set_chip_data failed\n" ,
__func__, __LINE__);
goto fail_set;
}
ps3_chip_mask(irq_get_irq_data(*virq));
return result;
fail_set:
irq_dispose_mapping(*virq);
fail_create:
return result;
}
/**
* ps3_virq_destroy - virq related teardown .
* @ virq : The assigned Linux virq .
*
* Clears chip data and calls irq_dispose_mapping ( ) for the virq .
*/
static int ps3_virq_destroy(unsigned int virq)
{
const struct ps3_private *pd = irq_get_chip_data(virq);
DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n" , __func__,
__LINE__, pd->ppe_id, pd->thread_id, virq);
irq_set_chip_data(virq, NULL);
irq_dispose_mapping(virq);
DBG("%s:%d <-\n" , __func__, __LINE__);
return 0 ;
}
/**
* ps3_irq_plug_setup - Generic outlet and virq related setup .
* @ cpu : enum ps3_cpu_binding indicating the cpu the interrupt should be
* serviced on .
* @ outlet : The HV outlet from the various create outlet routines .
* @ virq : The assigned Linux virq .
*
* Sets up virq and connects the irq plug .
*/
int ps3_irq_plug_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
unsigned int *virq)
{
int result;
struct ps3_private *pd;
result = ps3_virq_setup(cpu, outlet, virq);
if (result) {
FAIL("%s:%d: ps3_virq_setup failed\n" , __func__, __LINE__);
goto fail_setup;
}
pd = irq_get_chip_data(*virq);
/* Binds outlet to cpu + virq. */
result = lv1_connect_irq_plug_ext(pd->ppe_id, pd->thread_id, *virq,
outlet, 0 );
if (result) {
FAIL("%s:%d: lv1_connect_irq_plug_ext failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
result = -EPERM;
goto fail_connect;
}
return result;
fail_connect:
ps3_virq_destroy(*virq);
fail_setup:
return result;
}
EXPORT_SYMBOL_GPL(ps3_irq_plug_setup);
/**
* ps3_irq_plug_destroy - Generic outlet and virq related teardown .
* @ virq : The assigned Linux virq .
*
* Disconnects the irq plug and tears down virq .
* Do not call for system bus event interrupts setup with
* ps3_sb_event_receive_port_setup ( ) .
*/
int ps3_irq_plug_destroy(unsigned int virq)
{
int result;
const struct ps3_private *pd = irq_get_chip_data(virq);
DBG("%s:%d: ppe_id %llu, thread_id %llu, virq %u\n" , __func__,
__LINE__, pd->ppe_id, pd->thread_id, virq);
ps3_chip_mask(irq_get_irq_data(virq));
result = lv1_disconnect_irq_plug_ext(pd->ppe_id, pd->thread_id, virq);
if (result)
FAIL("%s:%d: lv1_disconnect_irq_plug_ext failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
ps3_virq_destroy(virq);
return result;
}
EXPORT_SYMBOL_GPL(ps3_irq_plug_destroy);
/**
* ps3_event_receive_port_setup - Setup an event receive port .
* @ cpu : enum ps3_cpu_binding indicating the cpu the interrupt should be
* serviced on .
* @ virq : The assigned Linux virq .
*
* The virq can be used with lv1_connect_interrupt_event_receive_port ( ) to
* arrange to receive interrupts from system - bus devices , or with
* ps3_send_event_locally ( ) to signal events .
*/
int ps3_event_receive_port_setup(enum ps3_cpu_binding cpu, unsigned int *virq)
{
int result;
u64 outlet;
result = lv1_construct_event_receive_port(&outlet);
if (result) {
FAIL("%s:%d: lv1_construct_event_receive_port failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
*virq = 0 ;
return result;
}
result = ps3_irq_plug_setup(cpu, outlet, virq);
BUG_ON(result);
return result;
}
EXPORT_SYMBOL_GPL(ps3_event_receive_port_setup);
/**
* ps3_event_receive_port_destroy - Destroy an event receive port .
* @ virq : The assigned Linux virq .
*
* Since ps3_event_receive_port_destroy destroys the receive port outlet ,
* SB devices need to call disconnect_interrupt_event_receive_port ( ) before
* this .
*/
int ps3_event_receive_port_destroy(unsigned int virq)
{
int result;
DBG(" -> %s:%d virq %u\n" , __func__, __LINE__, virq);
ps3_chip_mask(irq_get_irq_data(virq));
result = lv1_destruct_event_receive_port(virq_to_hw(virq));
if (result)
FAIL("%s:%d: lv1_destruct_event_receive_port failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
/*
* Don ' t call ps3_virq_destroy ( ) here since ps3_smp_cleanup_cpu ( )
* calls from interrupt context ( smp_call_function ) when kexecing .
*/
DBG(" <- %s:%d\n" , __func__, __LINE__);
return result;
}
int ps3_send_event_locally(unsigned int virq)
{
return lv1_send_event_locally(virq_to_hw(virq));
}
/**
* ps3_sb_event_receive_port_setup - Setup a system bus event receive port .
* @ dev : The system bus device instance .
* @ cpu : enum ps3_cpu_binding indicating the cpu the interrupt should be
* serviced on .
* @ virq : The assigned Linux virq .
*
* An event irq represents a virtual device interrupt . The interrupt_id
* coresponds to the software interrupt number .
*/
int ps3_sb_event_receive_port_setup(struct ps3_system_bus_device *dev,
enum ps3_cpu_binding cpu, unsigned int *virq)
{
/* this should go in system-bus.c */
int result;
result = ps3_event_receive_port_setup(cpu, virq);
if (result)
return result;
result = lv1_connect_interrupt_event_receive_port(dev->bus_id,
dev->dev_id, virq_to_hw(*virq), dev->interrupt_id);
if (result) {
FAIL("%s:%d: lv1_connect_interrupt_event_receive_port"
" failed: %s\n" , __func__, __LINE__,
ps3_result(result));
ps3_event_receive_port_destroy(*virq);
*virq = 0 ;
return result;
}
DBG("%s:%d: interrupt_id %u, virq %u\n" , __func__, __LINE__,
dev->interrupt_id, *virq);
return 0 ;
}
EXPORT_SYMBOL(ps3_sb_event_receive_port_setup);
int ps3_sb_event_receive_port_destroy(struct ps3_system_bus_device *dev,
unsigned int virq)
{
/* this should go in system-bus.c */
int result;
DBG(" -> %s:%d: interrupt_id %u, virq %u\n" , __func__, __LINE__,
dev->interrupt_id, virq);
result = lv1_disconnect_interrupt_event_receive_port(dev->bus_id,
dev->dev_id, virq_to_hw(virq), dev->interrupt_id);
if (result)
FAIL("%s:%d: lv1_disconnect_interrupt_event_receive_port"
" failed: %s\n" , __func__, __LINE__,
ps3_result(result));
result = ps3_event_receive_port_destroy(virq);
BUG_ON(result);
/*
* ps3_event_receive_port_destroy ( ) destroys the IRQ plug ,
* so don ' t call ps3_irq_plug_destroy ( ) here .
*/
result = ps3_virq_destroy(virq);
BUG_ON(result);
DBG(" <- %s:%d\n" , __func__, __LINE__);
return result;
}
EXPORT_SYMBOL(ps3_sb_event_receive_port_destroy);
/**
* ps3_io_irq_setup - Setup a system bus io irq .
* @ cpu : enum ps3_cpu_binding indicating the cpu the interrupt should be
* serviced on .
* @ interrupt_id : The device interrupt id read from the system repository .
* @ virq : The assigned Linux virq .
*
* An io irq represents a non - virtualized device interrupt . interrupt_id
* coresponds to the interrupt number of the interrupt controller .
*/
int ps3_io_irq_setup(enum ps3_cpu_binding cpu, unsigned int interrupt_id,
unsigned int *virq)
{
int result;
u64 outlet;
result = lv1_construct_io_irq_outlet(interrupt_id, &outlet);
if (result) {
FAIL("%s:%d: lv1_construct_io_irq_outlet failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
return result;
}
result = ps3_irq_plug_setup(cpu, outlet, virq);
BUG_ON(result);
return result;
}
EXPORT_SYMBOL_GPL(ps3_io_irq_setup);
int ps3_io_irq_destroy(unsigned int virq)
{
int result;
unsigned long outlet = virq_to_hw(virq);
ps3_chip_mask(irq_get_irq_data(virq));
/*
* lv1_destruct_io_irq_outlet ( ) will destroy the IRQ plug ,
* so call ps3_irq_plug_destroy ( ) first .
*/
result = ps3_irq_plug_destroy(virq);
BUG_ON(result);
result = lv1_destruct_io_irq_outlet(outlet);
if (result)
FAIL("%s:%d: lv1_destruct_io_irq_outlet failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
return result;
}
EXPORT_SYMBOL_GPL(ps3_io_irq_destroy);
/**
* ps3_vuart_irq_setup - Setup the system virtual uart virq .
* @ cpu : enum ps3_cpu_binding indicating the cpu the interrupt should be
* serviced on .
* @ virt_addr_bmp : The caller supplied virtual uart interrupt bitmap .
* @ virq : The assigned Linux virq .
*
* The system supports only a single virtual uart , so multiple calls without
* freeing the interrupt will return a wrong state error .
*/
int ps3_vuart_irq_setup(enum ps3_cpu_binding cpu, void * virt_addr_bmp,
unsigned int *virq)
{
int result;
u64 outlet;
u64 lpar_addr;
BUG_ON(!is_kernel_addr((u64)virt_addr_bmp));
lpar_addr = ps3_mm_phys_to_lpar(__pa(virt_addr_bmp));
result = lv1_configure_virtual_uart_irq(lpar_addr, &outlet);
if (result) {
FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
return result;
}
result = ps3_irq_plug_setup(cpu, outlet, virq);
BUG_ON(result);
return result;
}
EXPORT_SYMBOL_GPL(ps3_vuart_irq_setup);
int ps3_vuart_irq_destroy(unsigned int virq)
{
int result;
ps3_chip_mask(irq_get_irq_data(virq));
result = lv1_deconfigure_virtual_uart_irq();
if (result) {
FAIL("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
return result;
}
result = ps3_irq_plug_destroy(virq);
BUG_ON(result);
return result;
}
EXPORT_SYMBOL_GPL(ps3_vuart_irq_destroy);
/**
* ps3_spe_irq_setup - Setup an spe virq .
* @ cpu : enum ps3_cpu_binding indicating the cpu the interrupt should be
* serviced on .
* @ spe_id : The spe_id returned from lv1_construct_logical_spe ( ) .
* @ class : The spe interrupt class { 0 , 1 , 2 } .
* @ virq : The assigned Linux virq .
*
*/
int ps3_spe_irq_setup(enum ps3_cpu_binding cpu, unsigned long spe_id,
unsigned int class , unsigned int *virq)
{
int result;
u64 outlet;
BUG_ON(class > 2 );
result = lv1_get_spe_irq_outlet(spe_id, class , &outlet);
if (result) {
FAIL("%s:%d: lv1_get_spe_irq_outlet failed: %s\n" ,
__func__, __LINE__, ps3_result(result));
return result;
}
result = ps3_irq_plug_setup(cpu, outlet, virq);
BUG_ON(result);
return result;
}
int ps3_spe_irq_destroy(unsigned int virq)
{
int result;
ps3_chip_mask(irq_get_irq_data(virq));
result = ps3_irq_plug_destroy(virq);
BUG_ON(result);
return result;
}
#define PS3_INVALID_OUTLET ((irq_hw_number_t)-1 )
#define PS3_PLUG_MAX 63
#if defined (DEBUG)
static void _dump_64_bmp(const char *header, const u64 *p, unsigned cpu,
const char * func, int line)
{
pr_debug("%s:%d: %s %u {%04llx_%04llx_%04llx_%04llx}\n" ,
func, line, header, cpu,
*p >> 48 , (*p >> 32 ) & 0 xffff, (*p >> 16 ) & 0 xffff,
*p & 0 xffff);
}
static void __maybe_unused _dump_256_bmp(const char *header,
const u64 *p, unsigned cpu, const char * func, int line)
{
pr_debug("%s:%d: %s %u {%016llx:%016llx:%016llx:%016llx}\n" ,
func, line, header, cpu, p[0 ], p[1 ], p[2 ], p[3 ]);
}
#define dump_bmp(_x) _dump_bmp(_x, __func__, __LINE__)
static void _dump_bmp(struct ps3_private* pd, const char * func, int line)
{
unsigned long flags;
spin_lock_irqsave(&pd->bmp_lock, flags);
_dump_64_bmp("stat" , &pd->bmp.status, pd->thread_id, func, line);
_dump_64_bmp("mask" , (u64*)&pd->bmp.mask, pd->thread_id, func, line);
spin_unlock_irqrestore(&pd->bmp_lock, flags);
}
#define dump_mask(_x) _dump_mask(_x, __func__, __LINE__)
static void __maybe_unused _dump_mask(struct ps3_private *pd,
const char * func, int line)
{
unsigned long flags;
spin_lock_irqsave(&pd->bmp_lock, flags);
_dump_64_bmp("mask" , (u64*)&pd->bmp.mask, pd->thread_id, func, line);
spin_unlock_irqrestore(&pd->bmp_lock, flags);
}
#else
static void dump_bmp(struct ps3_private* pd) {};
#endif /* defined(DEBUG) */
static int ps3_host_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hwirq)
{
DBG("%s:%d: hwirq %lu, virq %u\n" , __func__, __LINE__, hwirq,
virq);
irq_set_chip_and_handler(virq, &ps3_irq_chip, handle_fasteoi_irq);
return 0 ;
}
static int ps3_host_match(struct irq_domain *h, struct device_node *np,
enum irq_domain_bus_token bus_token)
{
/* Match all */
return 1 ;
}
static const struct irq_domain_ops ps3_host_ops = {
.map = ps3_host_map,
.match = ps3_host_match,
};
void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
{
struct ps3_private *pd = &per_cpu(ps3_private, cpu);
set_bit(63 - virq, &pd->ipi_debug_brk_mask);
DBG("%s:%d: cpu %u, virq %u, mask %lxh\n" , __func__, __LINE__,
cpu, virq, pd->ipi_debug_brk_mask);
}
void __init ps3_register_ipi_irq(unsigned int cpu, unsigned int virq)
{
struct ps3_private *pd = &per_cpu(ps3_private, cpu);
set_bit(63 - virq, &pd->ipi_mask);
DBG("%s:%d: cpu %u, virq %u, ipi_mask %lxh\n" , __func__, __LINE__,
cpu, virq, pd->ipi_mask);
}
static unsigned int ps3_get_irq(void )
{
struct ps3_private *pd = this_cpu_ptr(&ps3_private);
u64 x = (pd->bmp.status & pd->bmp.mask);
unsigned int plug;
/* check for ipi break first to stop this cpu ASAP */
if (x & pd->ipi_debug_brk_mask)
x &= pd->ipi_debug_brk_mask;
asm volatile ("cntlzd %0,%1" : "=r" (plug) : "r" (x));
plug &= 0 x3f;
if (unlikely(!plug)) {
DBG("%s:%d: no plug found: thread_id %llu\n" , __func__,
__LINE__, pd->thread_id);
dump_bmp(&per_cpu(ps3_private, 0 ));
dump_bmp(&per_cpu(ps3_private, 1 ));
return 0 ;
}
#if defined (DEBUG)
if (unlikely(plug < NR_IRQS_LEGACY || plug > PS3_PLUG_MAX)) {
dump_bmp(&per_cpu(ps3_private, 0 ));
dump_bmp(&per_cpu(ps3_private, 1 ));
BUG();
}
#endif
/* IPIs are EOIed here. */
if (test_bit(63 - plug, &pd->ipi_mask))
lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, plug);
return plug;
}
void __init ps3_init_IRQ(void )
{
int result;
unsigned cpu;
struct irq_domain *host;
host = irq_domain_create_nomap(NULL, PS3_PLUG_MAX + 1 , &ps3_host_ops, NULL);
irq_set_default_domain(host);
for_each_possible_cpu(cpu) {
struct ps3_private *pd = &per_cpu(ps3_private, cpu);
lv1_get_logical_ppe_id(&pd->ppe_id);
pd->thread_id = get_hard_smp_processor_id(cpu);
spin_lock_init(&pd->bmp_lock);
DBG("%s:%d: ppe_id %llu, thread_id %llu, bmp %lxh\n" ,
__func__, __LINE__, pd->ppe_id, pd->thread_id,
ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
result = lv1_configure_irq_state_bitmap(pd->ppe_id,
pd->thread_id, ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
if (result)
FAIL("%s:%d: lv1_configure_irq_state_bitmap failed:"
" %s\n" , __func__, __LINE__,
ps3_result(result));
}
ppc_md.get_irq = ps3_get_irq;
}
void ps3_shutdown_IRQ(int cpu)
{
int result;
u64 ppe_id;
u64 thread_id = get_hard_smp_processor_id(cpu);
lv1_get_logical_ppe_id(&ppe_id);
result = lv1_configure_irq_state_bitmap(ppe_id, thread_id, 0 );
DBG("%s:%d: lv1_configure_irq_state_bitmap (%llu:%llu/%d) %s\n" , __func__,
__LINE__, ppe_id, thread_id, cpu, ps3_result(result));
}
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