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|
/*
* PS3 interrupt routines.
*
* Copyright (C) 2006 Sony Computer Entertainment Inc.
* Copyright 2006 Sony Corp.
*
* 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; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/irq.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
#else
#define DBG 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:
* @mask: 256 bit mask bitmap indexed by plug
* @unused_2:
* @lock:
* @ipi_debug_brk_mask:
*
* 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 {NUM_ISA_INTERRUPTS..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];
};
u64 ipi_debug_brk_mask;
spinlock_t lock;
};
/**
* struct ps3_private - a per cpu data structure
* @bmp: ps3_bmp structure
* @ppe_id: HV logical_ppe_id
* @thread_id: HV thread_id
*/
struct ps3_private {
struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
u64 ppe_id;
u64 thread_id;
};
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;
pr_debug("%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;
pr_debug("%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);
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 == NO_IRQ) {
pr_debug("%s:%d: irq_create_mapping failed: outlet %lu\n",
__func__, __LINE__, outlet);
result = -ENOMEM;
goto fail_create;
}
pr_debug("%s:%d: outlet %lu => cpu %u, virq %u\n", __func__, __LINE__,
outlet, cpu, *virq);
result = irq_set_chip_data(*virq, pd);
if (result) {
pr_debug("%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);
pr_debug("%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);
pr_debug("%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) {
pr_debug("%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) {
pr_info("%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
|