![Michael Ellerman](/assets/img/avatar_default.png)
Currently if you don't specify a match callback for your irq_host it's assumed you match everything. This is a kind of opt-out approach, and turns out to be the exception rather than the rule. So change the semantics to be opt-in, ie. you don't match anything unless you provide a match callback. This in itself isn't very useful, but will allow us to provide a default match implementation in a subsequent patch. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
776 lines
19 KiB
C
776 lines
19 KiB
C
/*
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* PS3 interrupt routines.
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*
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* Copyright (C) 2006 Sony Computer Entertainment Inc.
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* Copyright 2006 Sony Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/irq.h>
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#include <asm/machdep.h>
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#include <asm/udbg.h>
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#include <asm/lv1call.h>
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#include <asm/smp.h>
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#include "platform.h"
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#if defined(DEBUG)
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#define DBG udbg_printf
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#else
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#define DBG pr_debug
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#endif
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/**
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* struct ps3_bmp - a per cpu irq status and mask bitmap structure
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* @status: 256 bit status bitmap indexed by plug
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* @unused_1:
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* @mask: 256 bit mask bitmap indexed by plug
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* @unused_2:
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* @lock:
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* @ipi_debug_brk_mask:
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*
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* The HV mantains per SMT thread mappings of HV outlet to HV plug on
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* behalf of the guest. These mappings are implemented as 256 bit guest
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* supplied bitmaps indexed by plug number. The addresses of the bitmaps
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* are registered with the HV through lv1_configure_irq_state_bitmap().
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* The HV requires that the 512 bits of status + mask not cross a page
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* boundary. PS3_BMP_MINALIGN is used to define this minimal 64 byte
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* alignment.
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*
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* The HV supports 256 plugs per thread, assigned as {0..255}, for a total
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* of 512 plugs supported on a processor. To simplify the logic this
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* implementation equates HV plug value to Linux virq value, constrains each
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* interrupt to have a system wide unique plug number, and limits the range
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* of the plug values to map into the first dword of the bitmaps. This
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* gives a usable range of plug values of {NUM_ISA_INTERRUPTS..63}. Note
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* that there is no constraint on how many in this set an individual thread
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* can acquire.
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*/
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#define PS3_BMP_MINALIGN 64
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struct ps3_bmp {
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struct {
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u64 status;
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u64 unused_1[3];
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u64 mask;
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u64 unused_2[3];
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};
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u64 ipi_debug_brk_mask;
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spinlock_t lock;
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};
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/**
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* struct ps3_private - a per cpu data structure
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* @bmp: ps3_bmp structure
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* @ppe_id: HV logical_ppe_id
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* @thread_id: HV thread_id
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*/
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struct ps3_private {
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struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
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u64 ppe_id;
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u64 thread_id;
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};
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static DEFINE_PER_CPU(struct ps3_private, ps3_private);
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/**
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* ps3_chip_mask - Set an interrupt mask bit in ps3_bmp.
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* @virq: The assigned Linux virq.
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*
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* Sets ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
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*/
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static void ps3_chip_mask(unsigned int virq)
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{
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struct ps3_private *pd = get_irq_chip_data(virq);
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unsigned long flags;
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pr_debug("%s:%d: thread_id %lu, virq %d\n", __func__, __LINE__,
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pd->thread_id, virq);
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local_irq_save(flags);
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clear_bit(63 - virq, &pd->bmp.mask);
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lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
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local_irq_restore(flags);
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}
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/**
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* ps3_chip_unmask - Clear an interrupt mask bit in ps3_bmp.
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* @virq: The assigned Linux virq.
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*
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* Clears ps3_bmp.mask and calls lv1_did_update_interrupt_mask().
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*/
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static void ps3_chip_unmask(unsigned int virq)
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{
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struct ps3_private *pd = get_irq_chip_data(virq);
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unsigned long flags;
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pr_debug("%s:%d: thread_id %lu, virq %d\n", __func__, __LINE__,
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pd->thread_id, virq);
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local_irq_save(flags);
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set_bit(63 - virq, &pd->bmp.mask);
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lv1_did_update_interrupt_mask(pd->ppe_id, pd->thread_id);
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local_irq_restore(flags);
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}
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/**
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* ps3_chip_eoi - HV end-of-interrupt.
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* @virq: The assigned Linux virq.
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*
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* Calls lv1_end_of_interrupt_ext().
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*/
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static void ps3_chip_eoi(unsigned int virq)
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{
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const struct ps3_private *pd = get_irq_chip_data(virq);
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lv1_end_of_interrupt_ext(pd->ppe_id, pd->thread_id, virq);
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}
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/**
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* ps3_irq_chip - Represents the ps3_bmp as a Linux struct irq_chip.
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*/
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static struct irq_chip ps3_irq_chip = {
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.typename = "ps3",
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.mask = ps3_chip_mask,
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.unmask = ps3_chip_unmask,
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.eoi = ps3_chip_eoi,
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};
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/**
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* ps3_virq_setup - virq related setup.
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* @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
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* serviced on.
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* @outlet: The HV outlet from the various create outlet routines.
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* @virq: The assigned Linux virq.
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*
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* Calls irq_create_mapping() to get a virq and sets the chip data to
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* ps3_private data.
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*/
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int ps3_virq_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
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unsigned int *virq)
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{
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int result;
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struct ps3_private *pd;
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/* This defines the default interrupt distribution policy. */
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if (cpu == PS3_BINDING_CPU_ANY)
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cpu = 0;
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pd = &per_cpu(ps3_private, cpu);
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*virq = irq_create_mapping(NULL, outlet);
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if (*virq == NO_IRQ) {
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pr_debug("%s:%d: irq_create_mapping failed: outlet %lu\n",
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__func__, __LINE__, outlet);
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result = -ENOMEM;
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goto fail_create;
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}
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pr_debug("%s:%d: outlet %lu => cpu %u, virq %u\n", __func__, __LINE__,
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outlet, cpu, *virq);
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result = set_irq_chip_data(*virq, pd);
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if (result) {
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pr_debug("%s:%d: set_irq_chip_data failed\n",
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__func__, __LINE__);
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goto fail_set;
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}
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ps3_chip_mask(*virq);
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return result;
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fail_set:
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irq_dispose_mapping(*virq);
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fail_create:
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return result;
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}
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/**
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* ps3_virq_destroy - virq related teardown.
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* @virq: The assigned Linux virq.
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*
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* Clears chip data and calls irq_dispose_mapping() for the virq.
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*/
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int ps3_virq_destroy(unsigned int virq)
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{
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const struct ps3_private *pd = get_irq_chip_data(virq);
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pr_debug("%s:%d: ppe_id %lu, thread_id %lu, virq %u\n", __func__,
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__LINE__, pd->ppe_id, pd->thread_id, virq);
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set_irq_chip_data(virq, NULL);
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irq_dispose_mapping(virq);
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pr_debug("%s:%d <-\n", __func__, __LINE__);
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return 0;
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}
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/**
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* ps3_irq_plug_setup - Generic outlet and virq related setup.
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* @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
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* serviced on.
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* @outlet: The HV outlet from the various create outlet routines.
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* @virq: The assigned Linux virq.
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*
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* Sets up virq and connects the irq plug.
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*/
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int ps3_irq_plug_setup(enum ps3_cpu_binding cpu, unsigned long outlet,
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unsigned int *virq)
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{
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int result;
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struct ps3_private *pd;
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result = ps3_virq_setup(cpu, outlet, virq);
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if (result) {
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pr_debug("%s:%d: ps3_virq_setup failed\n", __func__, __LINE__);
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goto fail_setup;
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}
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pd = get_irq_chip_data(*virq);
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/* Binds outlet to cpu + virq. */
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result = lv1_connect_irq_plug_ext(pd->ppe_id, pd->thread_id, *virq,
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outlet, 0);
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if (result) {
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pr_info("%s:%d: lv1_connect_irq_plug_ext failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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result = -EPERM;
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goto fail_connect;
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}
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return result;
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fail_connect:
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ps3_virq_destroy(*virq);
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fail_setup:
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return result;
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}
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EXPORT_SYMBOL_GPL(ps3_irq_plug_setup);
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/**
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* ps3_irq_plug_destroy - Generic outlet and virq related teardown.
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* @virq: The assigned Linux virq.
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*
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* Disconnects the irq plug and tears down virq.
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* Do not call for system bus event interrupts setup with
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* ps3_sb_event_receive_port_setup().
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*/
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int ps3_irq_plug_destroy(unsigned int virq)
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{
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int result;
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const struct ps3_private *pd = get_irq_chip_data(virq);
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pr_debug("%s:%d: ppe_id %lu, thread_id %lu, virq %u\n", __func__,
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__LINE__, pd->ppe_id, pd->thread_id, virq);
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ps3_chip_mask(virq);
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result = lv1_disconnect_irq_plug_ext(pd->ppe_id, pd->thread_id, virq);
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if (result)
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pr_info("%s:%d: lv1_disconnect_irq_plug_ext failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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ps3_virq_destroy(virq);
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return result;
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}
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EXPORT_SYMBOL_GPL(ps3_irq_plug_destroy);
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/**
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* ps3_event_receive_port_setup - Setup an event receive port.
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* @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
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* serviced on.
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* @virq: The assigned Linux virq.
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*
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* The virq can be used with lv1_connect_interrupt_event_receive_port() to
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* arrange to receive interrupts from system-bus devices, or with
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* ps3_send_event_locally() to signal events.
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*/
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int ps3_event_receive_port_setup(enum ps3_cpu_binding cpu, unsigned int *virq)
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{
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int result;
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unsigned long outlet;
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result = lv1_construct_event_receive_port(&outlet);
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if (result) {
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pr_debug("%s:%d: lv1_construct_event_receive_port failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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*virq = NO_IRQ;
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return result;
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}
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result = ps3_irq_plug_setup(cpu, outlet, virq);
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BUG_ON(result);
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return result;
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}
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EXPORT_SYMBOL_GPL(ps3_event_receive_port_setup);
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/**
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* ps3_event_receive_port_destroy - Destroy an event receive port.
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* @virq: The assigned Linux virq.
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*
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* Since ps3_event_receive_port_destroy destroys the receive port outlet,
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* SB devices need to call disconnect_interrupt_event_receive_port() before
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* this.
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*/
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int ps3_event_receive_port_destroy(unsigned int virq)
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{
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int result;
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pr_debug(" -> %s:%d virq %u\n", __func__, __LINE__, virq);
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ps3_chip_mask(virq);
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result = lv1_destruct_event_receive_port(virq_to_hw(virq));
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if (result)
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pr_debug("%s:%d: lv1_destruct_event_receive_port failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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/*
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* Don't call ps3_virq_destroy() here since ps3_smp_cleanup_cpu()
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* calls from interrupt context (smp_call_function) when kexecing.
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*/
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pr_debug(" <- %s:%d\n", __func__, __LINE__);
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return result;
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}
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int ps3_send_event_locally(unsigned int virq)
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{
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return lv1_send_event_locally(virq_to_hw(virq));
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}
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/**
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* ps3_sb_event_receive_port_setup - Setup a system bus event receive port.
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* @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
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* serviced on.
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* @dev: The system bus device instance.
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* @virq: The assigned Linux virq.
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*
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* An event irq represents a virtual device interrupt. The interrupt_id
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* coresponds to the software interrupt number.
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*/
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int ps3_sb_event_receive_port_setup(struct ps3_system_bus_device *dev,
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enum ps3_cpu_binding cpu, unsigned int *virq)
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{
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/* this should go in system-bus.c */
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int result;
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result = ps3_event_receive_port_setup(cpu, virq);
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if (result)
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return result;
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result = lv1_connect_interrupt_event_receive_port(dev->bus_id,
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dev->dev_id, virq_to_hw(*virq), dev->interrupt_id);
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if (result) {
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pr_debug("%s:%d: lv1_connect_interrupt_event_receive_port"
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" failed: %s\n", __func__, __LINE__,
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ps3_result(result));
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ps3_event_receive_port_destroy(*virq);
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*virq = NO_IRQ;
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return result;
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}
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pr_debug("%s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
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dev->interrupt_id, *virq);
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return 0;
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}
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EXPORT_SYMBOL(ps3_sb_event_receive_port_setup);
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int ps3_sb_event_receive_port_destroy(struct ps3_system_bus_device *dev,
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unsigned int virq)
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{
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/* this should go in system-bus.c */
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int result;
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pr_debug(" -> %s:%d: interrupt_id %u, virq %u\n", __func__, __LINE__,
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dev->interrupt_id, virq);
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result = lv1_disconnect_interrupt_event_receive_port(dev->bus_id,
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dev->dev_id, virq_to_hw(virq), dev->interrupt_id);
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if (result)
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pr_debug("%s:%d: lv1_disconnect_interrupt_event_receive_port"
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" failed: %s\n", __func__, __LINE__,
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ps3_result(result));
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result = ps3_event_receive_port_destroy(virq);
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BUG_ON(result);
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/*
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* ps3_event_receive_port_destroy() destroys the IRQ plug,
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* so don't call ps3_irq_plug_destroy() here.
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*/
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result = ps3_virq_destroy(virq);
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BUG_ON(result);
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pr_debug(" <- %s:%d\n", __func__, __LINE__);
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return result;
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}
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EXPORT_SYMBOL(ps3_sb_event_receive_port_destroy);
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/**
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* ps3_io_irq_setup - Setup a system bus io irq.
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* @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
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* serviced on.
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* @interrupt_id: The device interrupt id read from the system repository.
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* @virq: The assigned Linux virq.
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*
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* An io irq represents a non-virtualized device interrupt. interrupt_id
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* coresponds to the interrupt number of the interrupt controller.
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*/
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int ps3_io_irq_setup(enum ps3_cpu_binding cpu, unsigned int interrupt_id,
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unsigned int *virq)
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{
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int result;
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unsigned long outlet;
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result = lv1_construct_io_irq_outlet(interrupt_id, &outlet);
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if (result) {
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pr_debug("%s:%d: lv1_construct_io_irq_outlet failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = ps3_irq_plug_setup(cpu, outlet, virq);
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BUG_ON(result);
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return result;
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}
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EXPORT_SYMBOL_GPL(ps3_io_irq_setup);
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int ps3_io_irq_destroy(unsigned int virq)
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{
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int result;
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unsigned long outlet = virq_to_hw(virq);
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ps3_chip_mask(virq);
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/*
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* lv1_destruct_io_irq_outlet() will destroy the IRQ plug,
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* so call ps3_irq_plug_destroy() first.
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*/
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result = ps3_irq_plug_destroy(virq);
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BUG_ON(result);
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result = lv1_destruct_io_irq_outlet(outlet);
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if (result)
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pr_debug("%s:%d: lv1_destruct_io_irq_outlet failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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EXPORT_SYMBOL_GPL(ps3_io_irq_destroy);
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/**
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* ps3_vuart_irq_setup - Setup the system virtual uart virq.
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* @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
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* serviced on.
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* @virt_addr_bmp: The caller supplied virtual uart interrupt bitmap.
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* @virq: The assigned Linux virq.
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*
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* The system supports only a single virtual uart, so multiple calls without
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* freeing the interrupt will return a wrong state error.
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*/
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int ps3_vuart_irq_setup(enum ps3_cpu_binding cpu, void* virt_addr_bmp,
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unsigned int *virq)
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{
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int result;
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unsigned long outlet;
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u64 lpar_addr;
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BUG_ON(!is_kernel_addr((u64)virt_addr_bmp));
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lpar_addr = ps3_mm_phys_to_lpar(__pa(virt_addr_bmp));
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result = lv1_configure_virtual_uart_irq(lpar_addr, &outlet);
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if (result) {
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pr_debug("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = ps3_irq_plug_setup(cpu, outlet, virq);
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BUG_ON(result);
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return result;
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}
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EXPORT_SYMBOL_GPL(ps3_vuart_irq_setup);
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int ps3_vuart_irq_destroy(unsigned int virq)
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{
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int result;
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ps3_chip_mask(virq);
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result = lv1_deconfigure_virtual_uart_irq();
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if (result) {
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pr_debug("%s:%d: lv1_configure_virtual_uart_irq failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = ps3_irq_plug_destroy(virq);
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BUG_ON(result);
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return result;
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}
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EXPORT_SYMBOL_GPL(ps3_vuart_irq_destroy);
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/**
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* ps3_spe_irq_setup - Setup an spe virq.
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* @cpu: enum ps3_cpu_binding indicating the cpu the interrupt should be
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* serviced on.
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* @spe_id: The spe_id returned from lv1_construct_logical_spe().
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* @class: The spe interrupt class {0,1,2}.
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* @virq: The assigned Linux virq.
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*
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*/
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int ps3_spe_irq_setup(enum ps3_cpu_binding cpu, unsigned long spe_id,
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unsigned int class, unsigned int *virq)
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{
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int result;
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unsigned long outlet;
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BUG_ON(class > 2);
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result = lv1_get_spe_irq_outlet(spe_id, class, &outlet);
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if (result) {
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pr_debug("%s:%d: lv1_get_spe_irq_outlet failed: %s\n",
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__func__, __LINE__, ps3_result(result));
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return result;
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}
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result = ps3_irq_plug_setup(cpu, outlet, virq);
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BUG_ON(result);
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return result;
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}
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int ps3_spe_irq_destroy(unsigned int virq)
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{
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int result;
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ps3_chip_mask(virq);
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result = ps3_irq_plug_destroy(virq);
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BUG_ON(result);
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return result;
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}
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#define PS3_INVALID_OUTLET ((irq_hw_number_t)-1)
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#define PS3_PLUG_MAX 63
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#if defined(DEBUG)
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static void _dump_64_bmp(const char *header, const u64 *p, unsigned cpu,
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const char* func, int line)
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{
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pr_debug("%s:%d: %s %u {%04lx_%04lx_%04lx_%04lx}\n",
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func, line, header, cpu,
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*p >> 48, (*p >> 32) & 0xffff, (*p >> 16) & 0xffff,
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*p & 0xffff);
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}
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static void __maybe_unused _dump_256_bmp(const char *header,
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const u64 *p, unsigned cpu, const char* func, int line)
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{
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pr_debug("%s:%d: %s %u {%016lx:%016lx:%016lx:%016lx}\n",
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func, line, header, cpu, p[0], p[1], p[2], p[3]);
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}
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#define dump_bmp(_x) _dump_bmp(_x, __func__, __LINE__)
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static void _dump_bmp(struct ps3_private* pd, const char* func, int line)
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{
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unsigned long flags;
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spin_lock_irqsave(&pd->bmp.lock, flags);
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_dump_64_bmp("stat", &pd->bmp.status, pd->thread_id, func, line);
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_dump_64_bmp("mask", &pd->bmp.mask, pd->thread_id, func, line);
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spin_unlock_irqrestore(&pd->bmp.lock, flags);
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}
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#define dump_mask(_x) _dump_mask(_x, __func__, __LINE__)
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static void __maybe_unused _dump_mask(struct ps3_private *pd,
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const char* func, int line)
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{
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unsigned long flags;
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spin_lock_irqsave(&pd->bmp.lock, flags);
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_dump_64_bmp("mask", &pd->bmp.mask, pd->thread_id, func, line);
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spin_unlock_irqrestore(&pd->bmp.lock, flags);
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}
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#else
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static void dump_bmp(struct ps3_private* pd) {};
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#endif /* defined(DEBUG) */
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static void ps3_host_unmap(struct irq_host *h, unsigned int virq)
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{
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set_irq_chip_data(virq, NULL);
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}
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static int ps3_host_map(struct irq_host *h, unsigned int virq,
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irq_hw_number_t hwirq)
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{
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pr_debug("%s:%d: hwirq %lu, virq %u\n", __func__, __LINE__, hwirq,
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virq);
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set_irq_chip_and_handler(virq, &ps3_irq_chip, handle_fasteoi_irq);
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return 0;
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}
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static int ps3_host_match(struct irq_host *h, struct device_node *np)
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{
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/* Match all */
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return 1;
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}
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static struct irq_host_ops ps3_host_ops = {
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.map = ps3_host_map,
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.unmap = ps3_host_unmap,
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.match = ps3_host_match,
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};
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void __init ps3_register_ipi_debug_brk(unsigned int cpu, unsigned int virq)
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{
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struct ps3_private *pd = &per_cpu(ps3_private, cpu);
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pd->bmp.ipi_debug_brk_mask = 0x8000000000000000UL >> virq;
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pr_debug("%s:%d: cpu %u, virq %u, mask %lxh\n", __func__, __LINE__,
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cpu, virq, pd->bmp.ipi_debug_brk_mask);
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}
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static unsigned int ps3_get_irq(void)
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{
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struct ps3_private *pd = &__get_cpu_var(ps3_private);
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u64 x = (pd->bmp.status & pd->bmp.mask);
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unsigned int plug;
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/* check for ipi break first to stop this cpu ASAP */
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if (x & pd->bmp.ipi_debug_brk_mask)
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x &= pd->bmp.ipi_debug_brk_mask;
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asm volatile("cntlzd %0,%1" : "=r" (plug) : "r" (x));
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plug &= 0x3f;
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if (unlikely(plug) == NO_IRQ) {
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pr_debug("%s:%d: no plug found: thread_id %lu\n", __func__,
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__LINE__, pd->thread_id);
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dump_bmp(&per_cpu(ps3_private, 0));
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dump_bmp(&per_cpu(ps3_private, 1));
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return NO_IRQ;
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}
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#if defined(DEBUG)
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if (unlikely(plug < NUM_ISA_INTERRUPTS || plug > PS3_PLUG_MAX)) {
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dump_bmp(&per_cpu(ps3_private, 0));
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dump_bmp(&per_cpu(ps3_private, 1));
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BUG();
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}
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#endif
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return plug;
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}
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void __init ps3_init_IRQ(void)
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{
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int result;
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unsigned cpu;
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struct irq_host *host;
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host = irq_alloc_host(NULL, IRQ_HOST_MAP_NOMAP, 0, &ps3_host_ops,
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PS3_INVALID_OUTLET);
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irq_set_default_host(host);
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irq_set_virq_count(PS3_PLUG_MAX + 1);
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for_each_possible_cpu(cpu) {
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struct ps3_private *pd = &per_cpu(ps3_private, cpu);
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lv1_get_logical_ppe_id(&pd->ppe_id);
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pd->thread_id = get_hard_smp_processor_id(cpu);
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spin_lock_init(&pd->bmp.lock);
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pr_debug("%s:%d: ppe_id %lu, thread_id %lu, bmp %lxh\n",
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__func__, __LINE__, pd->ppe_id, pd->thread_id,
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ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
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result = lv1_configure_irq_state_bitmap(pd->ppe_id,
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pd->thread_id, ps3_mm_phys_to_lpar(__pa(&pd->bmp)));
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if (result)
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pr_debug("%s:%d: lv1_configure_irq_state_bitmap failed:"
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" %s\n", __func__, __LINE__,
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ps3_result(result));
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}
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ppc_md.get_irq = ps3_get_irq;
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}
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void ps3_shutdown_IRQ(int cpu)
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{
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int result;
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u64 ppe_id;
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u64 thread_id = get_hard_smp_processor_id(cpu);
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lv1_get_logical_ppe_id(&ppe_id);
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result = lv1_configure_irq_state_bitmap(ppe_id, thread_id, 0);
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DBG("%s:%d: lv1_configure_irq_state_bitmap (%lu:%lu/%d) %s\n", __func__,
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__LINE__, ppe_id, thread_id, cpu, ps3_result(result));
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}
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