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linux-sg2042/arch/x86/kernel/apic/io_apic.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Intel IO-APIC support for multi-Pentium hosts.
*
* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
*
* Many thanks to Stig Venaas for trying out countless experimental
* patches and reporting/debugging problems patiently!
*
* (c) 1999, Multiple IO-APIC support, developed by
* Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
* Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
* further tested and cleaned up by Zach Brown <zab@redhat.com>
* and Ingo Molnar <mingo@redhat.com>
*
* Fixes
* Maciej W. Rozycki : Bits for genuine 82489DX APICs;
* thanks to Eric Gilmore
* and Rolf G. Tews
* for testing these extensively
* Paul Diefenbaugh : Added full ACPI support
*
* Historical information which is worth to be preserved:
*
* - SiS APIC rmw bug:
*
* We used to have a workaround for a bug in SiS chips which
* required to rewrite the index register for a read-modify-write
* operation as the chip lost the index information which was
* setup for the read already. We cache the data now, so that
* workaround has been removed.
*/
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/mc146818rtc.h>
#include <linux/compiler.h>
#include <linux/acpi.h>
#include <linux/export.h>
#include <linux/syscore_ops.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/jiffies.h> /* time_after() */
#include <linux/slab.h>
#include <linux/bootmem.h>
#include <asm/irqdomain.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/cpu.h>
#include <asm/desc.h>
#include <asm/proto.h>
#include <asm/acpi.h>
#include <asm/dma.h>
#include <asm/timer.h>
#include <asm/i8259.h>
#include <asm/setup.h>
#include <asm/irq_remapping.h>
#include <asm/hw_irq.h>
#include <asm/apic.h>
#define for_each_ioapic(idx) \
for ((idx) = 0; (idx) < nr_ioapics; (idx)++)
#define for_each_ioapic_reverse(idx) \
for ((idx) = nr_ioapics - 1; (idx) >= 0; (idx)--)
#define for_each_pin(idx, pin) \
for ((pin) = 0; (pin) < ioapics[(idx)].nr_registers; (pin)++)
#define for_each_ioapic_pin(idx, pin) \
for_each_ioapic((idx)) \
for_each_pin((idx), (pin))
#define for_each_irq_pin(entry, head) \
list_for_each_entry(entry, &head, list)
static DEFINE_RAW_SPINLOCK(ioapic_lock);
static DEFINE_MUTEX(ioapic_mutex);
static unsigned int ioapic_dynirq_base;
static int ioapic_initialized;
struct irq_pin_list {
struct list_head list;
int apic, pin;
};
struct mp_chip_data {
struct list_head irq_2_pin;
struct IO_APIC_route_entry entry;
int trigger;
int polarity;
u32 count;
bool isa_irq;
};
struct mp_ioapic_gsi {
u32 gsi_base;
u32 gsi_end;
};
static struct ioapic {
/*
* # of IRQ routing registers
*/
int nr_registers;
/*
* Saved state during suspend/resume, or while enabling intr-remap.
*/
struct IO_APIC_route_entry *saved_registers;
/* I/O APIC config */
struct mpc_ioapic mp_config;
/* IO APIC gsi routing info */
struct mp_ioapic_gsi gsi_config;
struct ioapic_domain_cfg irqdomain_cfg;
struct irq_domain *irqdomain;
struct resource *iomem_res;
} ioapics[MAX_IO_APICS];
#define mpc_ioapic_ver(ioapic_idx) ioapics[ioapic_idx].mp_config.apicver
int mpc_ioapic_id(int ioapic_idx)
{
return ioapics[ioapic_idx].mp_config.apicid;
}
unsigned int mpc_ioapic_addr(int ioapic_idx)
{
return ioapics[ioapic_idx].mp_config.apicaddr;
}
static inline struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
{
return &ioapics[ioapic_idx].gsi_config;
}
static inline int mp_ioapic_pin_count(int ioapic)
{
struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
return gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
}
static inline u32 mp_pin_to_gsi(int ioapic, int pin)
{
return mp_ioapic_gsi_routing(ioapic)->gsi_base + pin;
}
static inline bool mp_is_legacy_irq(int irq)
{
return irq >= 0 && irq < nr_legacy_irqs();
}
/*
* Initialize all legacy IRQs and all pins on the first IOAPIC
* if we have legacy interrupt controller. Kernel boot option "pirq="
* may rely on non-legacy pins on the first IOAPIC.
*/
static inline int mp_init_irq_at_boot(int ioapic, int irq)
{
if (!nr_legacy_irqs())
return 0;
return ioapic == 0 || mp_is_legacy_irq(irq);
}
static inline struct irq_domain *mp_ioapic_irqdomain(int ioapic)
{
return ioapics[ioapic].irqdomain;
}
int nr_ioapics;
/* The one past the highest gsi number used */
u32 gsi_top;
/* MP IRQ source entries */
struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
/* # of MP IRQ source entries */
int mp_irq_entries;
#ifdef CONFIG_EISA
int mp_bus_id_to_type[MAX_MP_BUSSES];
#endif
DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
int skip_ioapic_setup;
/**
* disable_ioapic_support() - disables ioapic support at runtime
*/
void disable_ioapic_support(void)
{
#ifdef CONFIG_PCI
noioapicquirk = 1;
noioapicreroute = -1;
#endif
skip_ioapic_setup = 1;
}
static int __init parse_noapic(char *str)
{
/* disable IO-APIC */
disable_ioapic_support();
return 0;
}
early_param("noapic", parse_noapic);
/* Will be called in mpparse/acpi/sfi codes for saving IRQ info */
void mp_save_irq(struct mpc_intsrc *m)
{
int i;
apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
" IRQ %02x, APIC ID %x, APIC INT %02x\n",
m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
m->srcbusirq, m->dstapic, m->dstirq);
for (i = 0; i < mp_irq_entries; i++) {
if (!memcmp(&mp_irqs[i], m, sizeof(*m)))
return;
}
memcpy(&mp_irqs[mp_irq_entries], m, sizeof(*m));
if (++mp_irq_entries == MAX_IRQ_SOURCES)
panic("Max # of irq sources exceeded!!\n");
}
static void alloc_ioapic_saved_registers(int idx)
{
size_t size;
if (ioapics[idx].saved_registers)
return;
size = sizeof(struct IO_APIC_route_entry) * ioapics[idx].nr_registers;
ioapics[idx].saved_registers = kzalloc(size, GFP_KERNEL);
if (!ioapics[idx].saved_registers)
pr_err("IOAPIC %d: suspend/resume impossible!\n", idx);
}
static void free_ioapic_saved_registers(int idx)
{
kfree(ioapics[idx].saved_registers);
ioapics[idx].saved_registers = NULL;
}
int __init arch_early_ioapic_init(void)
{
int i;
if (!nr_legacy_irqs())
io_apic_irqs = ~0UL;
for_each_ioapic(i)
alloc_ioapic_saved_registers(i);
return 0;
}
struct io_apic {
unsigned int index;
unsigned int unused[3];
unsigned int data;
unsigned int unused2[11];
unsigned int eoi;
};
static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
{
return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
+ (mpc_ioapic_addr(idx) & ~PAGE_MASK);
}
static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
{
struct io_apic __iomem *io_apic = io_apic_base(apic);
writel(vector, &io_apic->eoi);
}
unsigned int native_io_apic_read(unsigned int apic, unsigned int reg)
{
struct io_apic __iomem *io_apic = io_apic_base(apic);
writel(reg, &io_apic->index);
return readl(&io_apic->data);
}
static void io_apic_write(unsigned int apic, unsigned int reg,
unsigned int value)
{
struct io_apic __iomem *io_apic = io_apic_base(apic);
writel(reg, &io_apic->index);
writel(value, &io_apic->data);
}
union entry_union {
struct { u32 w1, w2; };
struct IO_APIC_route_entry entry;
};
static struct IO_APIC_route_entry __ioapic_read_entry(int apic, int pin)
{
union entry_union eu;
eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
return eu.entry;
}
static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
{
union entry_union eu;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
eu.entry = __ioapic_read_entry(apic, pin);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return eu.entry;
}
/*
* When we write a new IO APIC routing entry, we need to write the high
* word first! If the mask bit in the low word is clear, we will enable
* the interrupt, and we need to make sure the entry is fully populated
* before that happens.
*/
static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
{
union entry_union eu = {{0, 0}};
eu.entry = e;
io_apic_write(apic, 0x11 + 2*pin, eu.w2);
io_apic_write(apic, 0x10 + 2*pin, eu.w1);
}
static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
{
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
__ioapic_write_entry(apic, pin, e);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}
/*
* When we mask an IO APIC routing entry, we need to write the low
* word first, in order to set the mask bit before we change the
* high bits!
*/
static void ioapic_mask_entry(int apic, int pin)
{
unsigned long flags;
union entry_union eu = { .entry.mask = IOAPIC_MASKED };
raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0x10 + 2*pin, eu.w1);
io_apic_write(apic, 0x11 + 2*pin, eu.w2);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}
/*
* The common case is 1:1 IRQ<->pin mappings. Sometimes there are
* shared ISA-space IRQs, so we have to support them. We are super
* fast in the common case, and fast for shared ISA-space IRQs.
*/
static int __add_pin_to_irq_node(struct mp_chip_data *data,
int node, int apic, int pin)
{
struct irq_pin_list *entry;
/* don't allow duplicates */
for_each_irq_pin(entry, data->irq_2_pin)
if (entry->apic == apic && entry->pin == pin)
return 0;
entry = kzalloc_node(sizeof(struct irq_pin_list), GFP_ATOMIC, node);
if (!entry) {
pr_err("can not alloc irq_pin_list (%d,%d,%d)\n",
node, apic, pin);
return -ENOMEM;
}
entry->apic = apic;
entry->pin = pin;
list_add_tail(&entry->list, &data->irq_2_pin);
return 0;
}
static void __remove_pin_from_irq(struct mp_chip_data *data, int apic, int pin)
{
struct irq_pin_list *tmp, *entry;
list_for_each_entry_safe(entry, tmp, &data->irq_2_pin, list)
if (entry->apic == apic && entry->pin == pin) {
list_del(&entry->list);
kfree(entry);
return;
}
}
static void add_pin_to_irq_node(struct mp_chip_data *data,
int node, int apic, int pin)
{
if (__add_pin_to_irq_node(data, node, apic, pin))
panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
}
/*
* Reroute an IRQ to a different pin.
*/
static void __init replace_pin_at_irq_node(struct mp_chip_data *data, int node,
int oldapic, int oldpin,
int newapic, int newpin)
{
struct irq_pin_list *entry;
for_each_irq_pin(entry, data->irq_2_pin) {
if (entry->apic == oldapic && entry->pin == oldpin) {
entry->apic = newapic;
entry->pin = newpin;
/* every one is different, right? */
return;
}
}
/* old apic/pin didn't exist, so just add new ones */
add_pin_to_irq_node(data, node, newapic, newpin);
}
static void io_apic_modify_irq(struct mp_chip_data *data,
int mask_and, int mask_or,
void (*final)(struct irq_pin_list *entry))
{
union entry_union eu;
struct irq_pin_list *entry;
eu.entry = data->entry;
eu.w1 &= mask_and;
eu.w1 |= mask_or;
data->entry = eu.entry;
for_each_irq_pin(entry, data->irq_2_pin) {
io_apic_write(entry->apic, 0x10 + 2 * entry->pin, eu.w1);
if (final)
final(entry);
}
}
static void io_apic_sync(struct irq_pin_list *entry)
{
/*
* Synchronize the IO-APIC and the CPU by doing
* a dummy read from the IO-APIC
*/
struct io_apic __iomem *io_apic;
io_apic = io_apic_base(entry->apic);
readl(&io_apic->data);
}
static void mask_ioapic_irq(struct irq_data *irq_data)
{
struct mp_chip_data *data = irq_data->chip_data;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_modify_irq(data, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}
static void __unmask_ioapic(struct mp_chip_data *data)
{
io_apic_modify_irq(data, ~IO_APIC_REDIR_MASKED, 0, NULL);
}
static void unmask_ioapic_irq(struct irq_data *irq_data)
{
struct mp_chip_data *data = irq_data->chip_data;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
__unmask_ioapic(data);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}
/*
* IO-APIC versions below 0x20 don't support EOI register.
* For the record, here is the information about various versions:
* 0Xh 82489DX
* 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
* 2Xh I/O(x)APIC which is PCI 2.2 Compliant
* 30h-FFh Reserved
*
* Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
* version as 0x2. This is an error with documentation and these ICH chips
* use io-apic's of version 0x20.
*
* For IO-APIC's with EOI register, we use that to do an explicit EOI.
* Otherwise, we simulate the EOI message manually by changing the trigger
* mode to edge and then back to level, with RTE being masked during this.
*/
static void __eoi_ioapic_pin(int apic, int pin, int vector)
{
if (mpc_ioapic_ver(apic) >= 0x20) {
io_apic_eoi(apic, vector);
} else {
struct IO_APIC_route_entry entry, entry1;
entry = entry1 = __ioapic_read_entry(apic, pin);
/*
* Mask the entry and change the trigger mode to edge.
*/
entry1.mask = IOAPIC_MASKED;
entry1.trigger = IOAPIC_EDGE;
__ioapic_write_entry(apic, pin, entry1);
/*
* Restore the previous level triggered entry.
*/
__ioapic_write_entry(apic, pin, entry);
}
}
static void eoi_ioapic_pin(int vector, struct mp_chip_data *data)
{
unsigned long flags;
struct irq_pin_list *entry;
raw_spin_lock_irqsave(&ioapic_lock, flags);
for_each_irq_pin(entry, data->irq_2_pin)
__eoi_ioapic_pin(entry->apic, entry->pin, vector);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}
static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
{
struct IO_APIC_route_entry entry;
/* Check delivery_mode to be sure we're not clearing an SMI pin */
entry = ioapic_read_entry(apic, pin);
if (entry.delivery_mode == dest_SMI)
return;
/*
* Make sure the entry is masked and re-read the contents to check
* if it is a level triggered pin and if the remote-IRR is set.
*/
if (entry.mask == IOAPIC_UNMASKED) {
entry.mask = IOAPIC_MASKED;
ioapic_write_entry(apic, pin, entry);
entry = ioapic_read_entry(apic, pin);
}
if (entry.irr) {
unsigned long flags;
/*
* Make sure the trigger mode is set to level. Explicit EOI
* doesn't clear the remote-IRR if the trigger mode is not
* set to level.
*/
if (entry.trigger == IOAPIC_EDGE) {
entry.trigger = IOAPIC_LEVEL;
ioapic_write_entry(apic, pin, entry);
}
raw_spin_lock_irqsave(&ioapic_lock, flags);
__eoi_ioapic_pin(apic, pin, entry.vector);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}
/*
* Clear the rest of the bits in the IO-APIC RTE except for the mask
* bit.
*/
ioapic_mask_entry(apic, pin);
entry = ioapic_read_entry(apic, pin);
if (entry.irr)
pr_err("Unable to reset IRR for apic: %d, pin :%d\n",
mpc_ioapic_id(apic), pin);
}
static void clear_IO_APIC (void)
{
int apic, pin;
for_each_ioapic_pin(apic, pin)
clear_IO_APIC_pin(apic, pin);
}
#ifdef CONFIG_X86_32
/*
* support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
* specific CPU-side IRQs.
*/
#define MAX_PIRQS 8
static int pirq_entries[MAX_PIRQS] = {
[0 ... MAX_PIRQS - 1] = -1
};
static int __init ioapic_pirq_setup(char *str)
{
int i, max;
int ints[MAX_PIRQS+1];
get_options(str, ARRAY_SIZE(ints), ints);
apic_printk(APIC_VERBOSE, KERN_INFO
"PIRQ redirection, working around broken MP-BIOS.\n");
max = MAX_PIRQS;
if (ints[0] < MAX_PIRQS)
max = ints[0];
for (i = 0; i < max; i++) {
apic_printk(APIC_VERBOSE, KERN_DEBUG
"... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
/*
* PIRQs are mapped upside down, usually.
*/
pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
}
return 1;
}
__setup("pirq=", ioapic_pirq_setup);
#endif /* CONFIG_X86_32 */
/*
* Saves all the IO-APIC RTE's
*/
int save_ioapic_entries(void)
{
int apic, pin;
int err = 0;
for_each_ioapic(apic) {
if (!ioapics[apic].saved_registers) {
err = -ENOMEM;
continue;
}
for_each_pin(apic, pin)
ioapics[apic].saved_registers[pin] =
ioapic_read_entry(apic, pin);
}
return err;
}
/*
* Mask all IO APIC entries.
*/
void mask_ioapic_entries(void)
{
int apic, pin;
for_each_ioapic(apic) {
if (!ioapics[apic].saved_registers)
continue;
for_each_pin(apic, pin) {
struct IO_APIC_route_entry entry;
entry = ioapics[apic].saved_registers[pin];
if (entry.mask == IOAPIC_UNMASKED) {
entry.mask = IOAPIC_MASKED;
ioapic_write_entry(apic, pin, entry);
}
}
}
}
/*
* Restore IO APIC entries which was saved in the ioapic structure.
*/
int restore_ioapic_entries(void)
{
int apic, pin;
for_each_ioapic(apic) {
if (!ioapics[apic].saved_registers)
continue;
for_each_pin(apic, pin)
ioapic_write_entry(apic, pin,
ioapics[apic].saved_registers[pin]);
}
return 0;
}
/*
* Find the IRQ entry number of a certain pin.
*/
static int find_irq_entry(int ioapic_idx, int pin, int type)
{
int i;
for (i = 0; i < mp_irq_entries; i++)
if (mp_irqs[i].irqtype == type &&
(mp_irqs[i].dstapic == mpc_ioapic_id(ioapic_idx) ||
mp_irqs[i].dstapic == MP_APIC_ALL) &&
mp_irqs[i].dstirq == pin)
return i;
return -1;
}
/*
* Find the pin to which IRQ[irq] (ISA) is connected
*/
static int __init find_isa_irq_pin(int irq, int type)
{
int i;
for (i = 0; i < mp_irq_entries; i++) {
int lbus = mp_irqs[i].srcbus;
if (test_bit(lbus, mp_bus_not_pci) &&
(mp_irqs[i].irqtype == type) &&
(mp_irqs[i].srcbusirq == irq))
return mp_irqs[i].dstirq;
}
return -1;
}
static int __init find_isa_irq_apic(int irq, int type)
{
int i;
for (i = 0; i < mp_irq_entries; i++) {
int lbus = mp_irqs[i].srcbus;
if (test_bit(lbus, mp_bus_not_pci) &&
(mp_irqs[i].irqtype == type) &&
(mp_irqs[i].srcbusirq == irq))
break;
}
if (i < mp_irq_entries) {
int ioapic_idx;
for_each_ioapic(ioapic_idx)
if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
return ioapic_idx;
}
return -1;
}
#ifdef CONFIG_EISA
/*
* EISA Edge/Level control register, ELCR
*/
static int EISA_ELCR(unsigned int irq)
{
if (irq < nr_legacy_irqs()) {
unsigned int port = 0x4d0 + (irq >> 3);
return (inb(port) >> (irq & 7)) & 1;
}
apic_printk(APIC_VERBOSE, KERN_INFO
"Broken MPtable reports ISA irq %d\n", irq);
return 0;
}
#endif
/* ISA interrupts are always active high edge triggered,
* when listed as conforming in the MP table. */
#define default_ISA_trigger(idx) (IOAPIC_EDGE)
#define default_ISA_polarity(idx) (IOAPIC_POL_HIGH)
/* EISA interrupts are always polarity zero and can be edge or level
* trigger depending on the ELCR value. If an interrupt is listed as
* EISA conforming in the MP table, that means its trigger type must
* be read in from the ELCR */
#define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
#define default_EISA_polarity(idx) default_ISA_polarity(idx)
/* PCI interrupts are always active low level triggered,
* when listed as conforming in the MP table. */
#define default_PCI_trigger(idx) (IOAPIC_LEVEL)
#define default_PCI_polarity(idx) (IOAPIC_POL_LOW)
static int irq_polarity(int idx)
{
int bus = mp_irqs[idx].srcbus;
/*
* Determine IRQ line polarity (high active or low active):
*/
switch (mp_irqs[idx].irqflag & 0x03) {
case 0:
/* conforms to spec, ie. bus-type dependent polarity */
if (test_bit(bus, mp_bus_not_pci))
return default_ISA_polarity(idx);
else
return default_PCI_polarity(idx);
case 1:
return IOAPIC_POL_HIGH;
case 2:
pr_warn("IOAPIC: Invalid polarity: 2, defaulting to low\n");
case 3:
default: /* Pointless default required due to do gcc stupidity */
return IOAPIC_POL_LOW;
}
}
#ifdef CONFIG_EISA
static int eisa_irq_trigger(int idx, int bus, int trigger)
{
switch (mp_bus_id_to_type[bus]) {
case MP_BUS_PCI:
case MP_BUS_ISA:
return trigger;
case MP_BUS_EISA:
return default_EISA_trigger(idx);
}
pr_warn("IOAPIC: Invalid srcbus: %d defaulting to level\n", bus);
return IOAPIC_LEVEL;
}
#else
static inline int eisa_irq_trigger(int idx, int bus, int trigger)
{
return trigger;
}
#endif
static int irq_trigger(int idx)
{
int bus = mp_irqs[idx].srcbus;
int trigger;
/*
* Determine IRQ trigger mode (edge or level sensitive):
*/
switch ((mp_irqs[idx].irqflag >> 2) & 0x03) {
case 0:
/* conforms to spec, ie. bus-type dependent trigger mode */
if (test_bit(bus, mp_bus_not_pci))
trigger = default_ISA_trigger(idx);
else
trigger = default_PCI_trigger(idx);
/* Take EISA into account */
return eisa_irq_trigger(idx, bus, trigger);
case 1:
return IOAPIC_EDGE;
case 2:
pr_warn("IOAPIC: Invalid trigger mode 2 defaulting to level\n");
case 3:
default: /* Pointless default required due to do gcc stupidity */
return IOAPIC_LEVEL;
}
}
void ioapic_set_alloc_attr(struct irq_alloc_info *info, int node,
int trigger, int polarity)
{
init_irq_alloc_info(info, NULL);
info->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
info->ioapic_node = node;
info->ioapic_trigger = trigger;
info->ioapic_polarity = polarity;
info->ioapic_valid = 1;
}
#ifndef CONFIG_ACPI
int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
#endif
static void ioapic_copy_alloc_attr(struct irq_alloc_info *dst,
struct irq_alloc_info *src,
u32 gsi, int ioapic_idx, int pin)
{
int trigger, polarity;
copy_irq_alloc_info(dst, src);
dst->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
dst->ioapic_id = mpc_ioapic_id(ioapic_idx);
dst->ioapic_pin = pin;
dst->ioapic_valid = 1;
if (src && src->ioapic_valid) {
dst->ioapic_node = src->ioapic_node;
dst->ioapic_trigger = src->ioapic_trigger;
dst->ioapic_polarity = src->ioapic_polarity;
} else {
dst->ioapic_node = NUMA_NO_NODE;
if (acpi_get_override_irq(gsi, &trigger, &polarity) >= 0) {
dst->ioapic_trigger = trigger;
dst->ioapic_polarity = polarity;
} else {
/*
* PCI interrupts are always active low level
* triggered.
*/
dst->ioapic_trigger = IOAPIC_LEVEL;
dst->ioapic_polarity = IOAPIC_POL_LOW;
}
}
}
static int ioapic_alloc_attr_node(struct irq_alloc_info *info)
{
return (info && info->ioapic_valid) ? info->ioapic_node : NUMA_NO_NODE;
}
static void mp_register_handler(unsigned int irq, unsigned long trigger)
{
irq_flow_handler_t hdl;
bool fasteoi;
if (trigger) {
irq_set_status_flags(irq, IRQ_LEVEL);
fasteoi = true;
} else {
irq_clear_status_flags(irq, IRQ_LEVEL);
fasteoi = false;
}
hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
__irq_set_handler(irq, hdl, 0, fasteoi ? "fasteoi" : "edge");
}
static bool mp_check_pin_attr(int irq, struct irq_alloc_info *info)
{
struct mp_chip_data *data = irq_get_chip_data(irq);
/*
* setup_IO_APIC_irqs() programs all legacy IRQs with default trigger
* and polarity attirbutes. So allow the first user to reprogram the
* pin with real trigger and polarity attributes.
*/
if (irq < nr_legacy_irqs() && data->count == 1) {
if (info->ioapic_trigger != data->trigger)
mp_register_handler(irq, info->ioapic_trigger);
data->entry.trigger = data->trigger = info->ioapic_trigger;
data->entry.polarity = data->polarity = info->ioapic_polarity;
}
return data->trigger == info->ioapic_trigger &&
data->polarity == info->ioapic_polarity;
}
static int alloc_irq_from_domain(struct irq_domain *domain, int ioapic, u32 gsi,
struct irq_alloc_info *info)
{
bool legacy = false;
int irq = -1;
int type = ioapics[ioapic].irqdomain_cfg.type;
switch (type) {
case IOAPIC_DOMAIN_LEGACY:
/*
* Dynamically allocate IRQ number for non-ISA IRQs in the first
* 16 GSIs on some weird platforms.
*/
if (!ioapic_initialized || gsi >= nr_legacy_irqs())
irq = gsi;
legacy = mp_is_legacy_irq(irq);
break;
case IOAPIC_DOMAIN_STRICT:
irq = gsi;
break;
case IOAPIC_DOMAIN_DYNAMIC:
break;
default:
WARN(1, "ioapic: unknown irqdomain type %d\n", type);
return -1;
}
return __irq_domain_alloc_irqs(domain, irq, 1,
ioapic_alloc_attr_node(info),
info, legacy, NULL);
}
/*
* Need special handling for ISA IRQs because there may be multiple IOAPIC pins
* sharing the same ISA IRQ number and irqdomain only supports 1:1 mapping
* between IOAPIC pin and IRQ number. A typical IOAPIC has 24 pins, pin 0-15 are
* used for legacy IRQs and pin 16-23 are used for PCI IRQs (PIRQ A-H).
* When ACPI is disabled, only legacy IRQ numbers (IRQ0-15) are available, and
* some BIOSes may use MP Interrupt Source records to override IRQ numbers for
* PIRQs instead of reprogramming the interrupt routing logic. Thus there may be
* multiple pins sharing the same legacy IRQ number when ACPI is disabled.
*/
static int alloc_isa_irq_from_domain(struct irq_domain *domain,
int irq, int ioapic, int pin,
struct irq_alloc_info *info)
{
struct mp_chip_data *data;
struct irq_data *irq_data = irq_get_irq_data(irq);
int node = ioapic_alloc_attr_node(info);
/*
* Legacy ISA IRQ has already been allocated, just add pin to
* the pin list assoicated with this IRQ and program the IOAPIC
* entry. The IOAPIC entry
*/
if (irq_data && irq_data->parent_data) {
if (!mp_check_pin_attr(irq, info))
return -EBUSY;
if (__add_pin_to_irq_node(irq_data->chip_data, node, ioapic,
info->ioapic_pin))
return -ENOMEM;
} else {
info->flags |= X86_IRQ_ALLOC_LEGACY;
irq = __irq_domain_alloc_irqs(domain, irq, 1, node, info, true,
NULL);
if (irq >= 0) {
irq_data = irq_domain_get_irq_data(domain, irq);
data = irq_data->chip_data;
data->isa_irq = true;
}
}
return irq;
}
static int mp_map_pin_to_irq(u32 gsi, int idx, int ioapic, int pin,
unsigned int flags, struct irq_alloc_info *info)
{
int irq;
bool legacy = false;
struct irq_alloc_info tmp;
struct mp_chip_data *data;
struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
if (!domain)
return -ENOSYS;
if (idx >= 0 && test_bit(mp_irqs[idx].srcbus, mp_bus_not_pci)) {
irq = mp_irqs[idx].srcbusirq;
legacy = mp_is_legacy_irq(irq);
}
mutex_lock(&ioapic_mutex);
if (!(flags & IOAPIC_MAP_ALLOC)) {
if (!legacy) {
irq = irq_find_mapping(domain, pin);
if (irq == 0)
irq = -ENOENT;
}
} else {
ioapic_copy_alloc_attr(&tmp, info, gsi, ioapic, pin);
if (legacy)
irq = alloc_isa_irq_from_domain(domain, irq,
ioapic, pin, &tmp);
else if ((irq = irq_find_mapping(domain, pin)) == 0)
irq = alloc_irq_from_domain(domain, ioapic, gsi, &tmp);
else if (!mp_check_pin_attr(irq, &tmp))
irq = -EBUSY;
if (irq >= 0) {
data = irq_get_chip_data(irq);
data->count++;
}
}
mutex_unlock(&ioapic_mutex);
return irq;
}
static int pin_2_irq(int idx, int ioapic, int pin, unsigned int flags)
{
u32 gsi = mp_pin_to_gsi(ioapic, pin);
/*
* Debugging check, we are in big trouble if this message pops up!
*/
if (mp_irqs[idx].dstirq != pin)
pr_err("broken BIOS or MPTABLE parser, ayiee!!\n");
#ifdef CONFIG_X86_32
/*
* PCI IRQ command line redirection. Yes, limits are hardcoded.
*/
if ((pin >= 16) && (pin <= 23)) {
if (pirq_entries[pin-16] != -1) {
if (!pirq_entries[pin-16]) {
apic_printk(APIC_VERBOSE, KERN_DEBUG
"disabling PIRQ%d\n", pin-16);
} else {
int irq = pirq_entries[pin-16];
apic_printk(APIC_VERBOSE, KERN_DEBUG
"using PIRQ%d -> IRQ %d\n",
pin-16, irq);
return irq;
}
}
}
#endif
return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, NULL);
}
int mp_map_gsi_to_irq(u32 gsi, unsigned int flags, struct irq_alloc_info *info)
{
int ioapic, pin, idx;
ioapic = mp_find_ioapic(gsi);
if (ioapic < 0)
return -ENODEV;
pin = mp_find_ioapic_pin(ioapic, gsi);
idx = find_irq_entry(ioapic, pin, mp_INT);
if ((flags & IOAPIC_MAP_CHECK) && idx < 0)
return -ENODEV;
return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, info);
}
void mp_unmap_irq(int irq)
{
struct irq_data *irq_data = irq_get_irq_data(irq);
struct mp_chip_data *data;
if (!irq_data || !irq_data->domain)
return;
data = irq_data->chip_data;
if (!data || data->isa_irq)
return;
mutex_lock(&ioapic_mutex);
if (--data->count == 0)
irq_domain_free_irqs(irq, 1);
mutex_unlock(&ioapic_mutex);
}
/*
* Find a specific PCI IRQ entry.
* Not an __init, possibly needed by modules
*/
int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
{
int irq, i, best_ioapic = -1, best_idx = -1;
apic_printk(APIC_DEBUG,
"querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
bus, slot, pin);
if (test_bit(bus, mp_bus_not_pci)) {
apic_printk(APIC_VERBOSE,
"PCI BIOS passed nonexistent PCI bus %d!\n", bus);
return -1;
}
for (i = 0; i < mp_irq_entries; i++) {
int lbus = mp_irqs[i].srcbus;
int ioapic_idx, found = 0;
if (bus != lbus || mp_irqs[i].irqtype != mp_INT ||
slot != ((mp_irqs[i].srcbusirq >> 2) & 0x1f))
continue;
for_each_ioapic(ioapic_idx)
if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
mp_irqs[i].dstapic == MP_APIC_ALL) {
found = 1;
break;
}
if (!found)
continue;
/* Skip ISA IRQs */
irq = pin_2_irq(i, ioapic_idx, mp_irqs[i].dstirq, 0);
if (irq > 0 && !IO_APIC_IRQ(irq))
continue;
if (pin == (mp_irqs[i].srcbusirq & 3)) {
best_idx = i;
best_ioapic = ioapic_idx;
goto out;
}
/*
* Use the first all-but-pin matching entry as a
* best-guess fuzzy result for broken mptables.
*/
if (best_idx < 0) {
best_idx = i;
best_ioapic = ioapic_idx;
}
}
if (best_idx < 0)
return -1;
out:
return pin_2_irq(best_idx, best_ioapic, mp_irqs[best_idx].dstirq,
IOAPIC_MAP_ALLOC);
}
EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
static struct irq_chip ioapic_chip, ioapic_ir_chip;
static void __init setup_IO_APIC_irqs(void)
{
unsigned int ioapic, pin;
int idx;
apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
for_each_ioapic_pin(ioapic, pin) {
idx = find_irq_entry(ioapic, pin, mp_INT);
if (idx < 0)
apic_printk(APIC_VERBOSE,
KERN_DEBUG " apic %d pin %d not connected\n",
mpc_ioapic_id(ioapic), pin);
else
pin_2_irq(idx, ioapic, pin,
ioapic ? 0 : IOAPIC_MAP_ALLOC);
}
}
void ioapic_zap_locks(void)
{
raw_spin_lock_init(&ioapic_lock);
}
static void io_apic_print_entries(unsigned int apic, unsigned int nr_entries)
{
int i;
char buf[256];
struct IO_APIC_route_entry entry;
struct IR_IO_APIC_route_entry *ir_entry = (void *)&entry;
printk(KERN_DEBUG "IOAPIC %d:\n", apic);
for (i = 0; i <= nr_entries; i++) {
entry = ioapic_read_entry(apic, i);
snprintf(buf, sizeof(buf),
" pin%02x, %s, %s, %s, V(%02X), IRR(%1d), S(%1d)",
i,
entry.mask == IOAPIC_MASKED ? "disabled" : "enabled ",
entry.trigger == IOAPIC_LEVEL ? "level" : "edge ",
entry.polarity == IOAPIC_POL_LOW ? "low " : "high",
entry.vector, entry.irr, entry.delivery_status);
if (ir_entry->format)
printk(KERN_DEBUG "%s, remapped, I(%04X), Z(%X)\n",
buf, (ir_entry->index2 << 15) | ir_entry->index,
ir_entry->zero);
else
printk(KERN_DEBUG "%s, %s, D(%02X), M(%1d)\n",
buf,
entry.dest_mode == IOAPIC_DEST_MODE_LOGICAL ?
"logical " : "physical",
entry.dest, entry.delivery_mode);
}
}
static void __init print_IO_APIC(int ioapic_idx)
{
union IO_APIC_reg_00 reg_00;
union IO_APIC_reg_01 reg_01;
union IO_APIC_reg_02 reg_02;
union IO_APIC_reg_03 reg_03;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic_idx, 0);
reg_01.raw = io_apic_read(ioapic_idx, 1);
if (reg_01.bits.version >= 0x10)
reg_02.raw = io_apic_read(ioapic_idx, 2);
if (reg_01.bits.version >= 0x20)
reg_03.raw = io_apic_read(ioapic_idx, 3);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(ioapic_idx));
printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)&reg_01);
printk(KERN_DEBUG "....... : max redirection entries: %02X\n",
reg_01.bits.entries);
printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
printk(KERN_DEBUG "....... : IO APIC version: %02X\n",
reg_01.bits.version);
/*
* Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
* but the value of reg_02 is read as the previous read register
* value, so ignore it if reg_02 == reg_01.
*/
if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
}
/*
* Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
* or reg_03, but the value of reg_0[23] is read as the previous read
* register value, so ignore it if reg_03 == reg_0[12].
*/
if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
reg_03.raw != reg_01.raw) {
printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
}
printk(KERN_DEBUG ".... IRQ redirection table:\n");
io_apic_print_entries(ioapic_idx, reg_01.bits.entries);
}
void __init print_IO_APICs(void)
{
int ioapic_idx;
unsigned int irq;
printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
for_each_ioapic(ioapic_idx)
printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
mpc_ioapic_id(ioapic_idx),
ioapics[ioapic_idx].nr_registers);
/*
* We are a bit conservative about what we expect. We have to
* know about every hardware change ASAP.
*/
printk(KERN_INFO "testing the IO APIC.......................\n");
for_each_ioapic(ioapic_idx)
print_IO_APIC(ioapic_idx);
printk(KERN_DEBUG "IRQ to pin mappings:\n");
for_each_active_irq(irq) {
struct irq_pin_list *entry;
struct irq_chip *chip;
struct mp_chip_data *data;
chip = irq_get_chip(irq);
if (chip != &ioapic_chip && chip != &ioapic_ir_chip)
continue;
data = irq_get_chip_data(irq);
if (!data)
continue;
if (list_empty(&data->irq_2_pin))
continue;
printk(KERN_DEBUG "IRQ%d ", irq);
for_each_irq_pin(entry, data->irq_2_pin)
pr_cont("-> %d:%d", entry->apic, entry->pin);
pr_cont("\n");
}
printk(KERN_INFO ".................................... done.\n");
}
/* Where if anywhere is the i8259 connect in external int mode */
static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
void __init enable_IO_APIC(void)
{
int i8259_apic, i8259_pin;
int apic, pin;
if (skip_ioapic_setup)
nr_ioapics = 0;
if (!nr_legacy_irqs() || !nr_ioapics)
return;
for_each_ioapic_pin(apic, pin) {
/* See if any of the pins is in ExtINT mode */
struct IO_APIC_route_entry entry = ioapic_read_entry(apic, pin);
/* If the interrupt line is enabled and in ExtInt mode
* I have found the pin where the i8259 is connected.
*/
if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
ioapic_i8259.apic = apic;
ioapic_i8259.pin = pin;
goto found_i8259;
}
}
found_i8259:
/* Look to see what if the MP table has reported the ExtINT */
/* If we could not find the appropriate pin by looking at the ioapic
* the i8259 probably is not connected the ioapic but give the
* mptable a chance anyway.
*/
i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
/* Trust the MP table if nothing is setup in the hardware */
if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
ioapic_i8259.pin = i8259_pin;
ioapic_i8259.apic = i8259_apic;
}
/* Complain if the MP table and the hardware disagree */
if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
(i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
{
printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
}
/*
* Do not trust the IO-APIC being empty at bootup
*/
clear_IO_APIC();
}
void native_disable_io_apic(void)
{
/*
* If the i8259 is routed through an IOAPIC
* Put that IOAPIC in virtual wire mode
* so legacy interrupts can be delivered.
*/
if (ioapic_i8259.pin != -1) {
struct IO_APIC_route_entry entry;
memset(&entry, 0, sizeof(entry));
entry.mask = IOAPIC_UNMASKED;
entry.trigger = IOAPIC_EDGE;
entry.polarity = IOAPIC_POL_HIGH;
entry.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
entry.delivery_mode = dest_ExtINT;
entry.dest = read_apic_id();
/*
* Add it to the IO-APIC irq-routing table:
*/
ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
}
if (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config())
disconnect_bsp_APIC(ioapic_i8259.pin != -1);
}
/*
* Not an __init, needed by the reboot code
*/
void disable_IO_APIC(void)
{
/*
* Clear the IO-APIC before rebooting:
*/
clear_IO_APIC();
if (!nr_legacy_irqs())
return;
x86_io_apic_ops.disable();
}
#ifdef CONFIG_X86_32
/*
* function to set the IO-APIC physical IDs based on the
* values stored in the MPC table.
*
* by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
*/
void __init setup_ioapic_ids_from_mpc_nocheck(void)
{
union IO_APIC_reg_00 reg_00;
physid_mask_t phys_id_present_map;
int ioapic_idx;
int i;
unsigned char old_id;
unsigned long flags;
/*
* This is broken; anything with a real cpu count has to
* circumvent this idiocy regardless.
*/
apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
/*
* Set the IOAPIC ID to the value stored in the MPC table.
*/
for_each_ioapic(ioapic_idx) {
/* Read the register 0 value */
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic_idx, 0);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
old_id = mpc_ioapic_id(ioapic_idx);
if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
ioapic_idx, mpc_ioapic_id(ioapic_idx));
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
reg_00.bits.ID);
ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
}
/*
* Sanity check, is the ID really free? Every APIC in a
* system must have a unique ID or we get lots of nice
* 'stuck on smp_invalidate_needed IPI wait' messages.
*/
if (apic->check_apicid_used(&phys_id_present_map,
mpc_ioapic_id(ioapic_idx))) {
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
ioapic_idx, mpc_ioapic_id(ioapic_idx));
for (i = 0; i < get_physical_broadcast(); i++)
if (!physid_isset(i, phys_id_present_map))
break;
if (i >= get_physical_broadcast())
panic("Max APIC ID exceeded!\n");
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
i);
physid_set(i, phys_id_present_map);
ioapics[ioapic_idx].mp_config.apicid = i;
} else {
physid_mask_t tmp;
apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
&tmp);
apic_printk(APIC_VERBOSE, "Setting %d in the "
"phys_id_present_map\n",
mpc_ioapic_id(ioapic_idx));
physids_or(phys_id_present_map, phys_id_present_map, tmp);
}
/*
* We need to adjust the IRQ routing table
* if the ID changed.
*/
if (old_id != mpc_ioapic_id(ioapic_idx))
for (i = 0; i < mp_irq_entries; i++)
if (mp_irqs[i].dstapic == old_id)
mp_irqs[i].dstapic
= mpc_ioapic_id(ioapic_idx);
/*
* Update the ID register according to the right value
* from the MPC table if they are different.
*/
if (mpc_ioapic_id(ioapic_idx) == reg_00.bits.ID)
continue;
apic_printk(APIC_VERBOSE, KERN_INFO
"...changing IO-APIC physical APIC ID to %d ...",
mpc_ioapic_id(ioapic_idx));
reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(ioapic_idx, 0, reg_00.raw);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
/*
* Sanity check
*/
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic_idx, 0);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx))
pr_cont("could not set ID!\n");
else
apic_printk(APIC_VERBOSE, " ok.\n");
}
}
void __init setup_ioapic_ids_from_mpc(void)
{
if (acpi_ioapic)
return;
/*
* Don't check I/O APIC IDs for xAPIC systems. They have
* no meaning without the serial APIC bus.
*/
if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
|| APIC_XAPIC(boot_cpu_apic_version))
return;
setup_ioapic_ids_from_mpc_nocheck();
}
#endif
int no_timer_check __initdata;
static int __init notimercheck(char *s)
{
no_timer_check = 1;
return 1;
}
__setup("no_timer_check", notimercheck);
static void __init delay_with_tsc(void)
{
unsigned long long start, now;
unsigned long end = jiffies + 4;
start = rdtsc();
/*
* We don't know the TSC frequency yet, but waiting for
* 40000000000/HZ TSC cycles is safe:
* 4 GHz == 10 jiffies
* 1 GHz == 40 jiffies
*/
do {
rep_nop();
now = rdtsc();
} while ((now - start) < 40000000000UL / HZ &&
time_before_eq(jiffies, end));
}
static void __init delay_without_tsc(void)
{
unsigned long end = jiffies + 4;
int band = 1;
/*
* We don't know any frequency yet, but waiting for
* 40940000000/HZ cycles is safe:
* 4 GHz == 10 jiffies
* 1 GHz == 40 jiffies
* 1 << 1 + 1 << 2 +...+ 1 << 11 = 4094
*/
do {
__delay(((1U << band++) * 10000000UL) / HZ);
} while (band < 12 && time_before_eq(jiffies, end));
}
/*
* There is a nasty bug in some older SMP boards, their mptable lies
* about the timer IRQ. We do the following to work around the situation:
*
* - timer IRQ defaults to IO-APIC IRQ
* - if this function detects that timer IRQs are defunct, then we fall
* back to ISA timer IRQs
*/
static int __init timer_irq_works(void)
{
unsigned long t1 = jiffies;
unsigned long flags;
if (no_timer_check)
return 1;
local_save_flags(flags);
local_irq_enable();
if (boot_cpu_has(X86_FEATURE_TSC))
delay_with_tsc();
else
delay_without_tsc();
local_irq_restore(flags);
/*
* Expect a few ticks at least, to be sure some possible
* glue logic does not lock up after one or two first
* ticks in a non-ExtINT mode. Also the local APIC
* might have cached one ExtINT interrupt. Finally, at
* least one tick may be lost due to delays.
*/
/* jiffies wrap? */
if (time_after(jiffies, t1 + 4))
return 1;
return 0;
}
/*
* In the SMP+IOAPIC case it might happen that there are an unspecified
* number of pending IRQ events unhandled. These cases are very rare,
* so we 'resend' these IRQs via IPIs, to the same CPU. It's much
* better to do it this way as thus we do not have to be aware of
* 'pending' interrupts in the IRQ path, except at this point.
*/
/*
* Edge triggered needs to resend any interrupt
* that was delayed but this is now handled in the device
* independent code.
*/
/*
* Starting up a edge-triggered IO-APIC interrupt is
* nasty - we need to make sure that we get the edge.
* If it is already asserted for some reason, we need
* return 1 to indicate that is was pending.
*
* This is not complete - we should be able to fake
* an edge even if it isn't on the 8259A...
*/
static unsigned int startup_ioapic_irq(struct irq_data *data)
{
int was_pending = 0, irq = data->irq;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
if (irq < nr_legacy_irqs()) {
legacy_pic->mask(irq);
if (legacy_pic->irq_pending(irq))
was_pending = 1;
}
__unmask_ioapic(data->chip_data);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return was_pending;
}
atomic_t irq_mis_count;
#ifdef CONFIG_GENERIC_PENDING_IRQ
static bool io_apic_level_ack_pending(struct mp_chip_data *data)
{
struct irq_pin_list *entry;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
for_each_irq_pin(entry, data->irq_2_pin) {
unsigned int reg;
int pin;
pin = entry->pin;
reg = io_apic_read(entry->apic, 0x10 + pin*2);
/* Is the remote IRR bit set? */
if (reg & IO_APIC_REDIR_REMOTE_IRR) {
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return true;
}
}
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return false;
}
static inline bool ioapic_irqd_mask(struct irq_data *data)
{
/* If we are moving the irq we need to mask it */
if (unlikely(irqd_is_setaffinity_pending(data))) {
mask_ioapic_irq(data);
return true;
}
return false;
}
static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
{
if (unlikely(masked)) {
/* Only migrate the irq if the ack has been received.
*
* On rare occasions the broadcast level triggered ack gets
* delayed going to ioapics, and if we reprogram the
* vector while Remote IRR is still set the irq will never
* fire again.
*
* To prevent this scenario we read the Remote IRR bit
* of the ioapic. This has two effects.
* - On any sane system the read of the ioapic will
* flush writes (and acks) going to the ioapic from
* this cpu.
* - We get to see if the ACK has actually been delivered.
*
* Based on failed experiments of reprogramming the
* ioapic entry from outside of irq context starting
* with masking the ioapic entry and then polling until
* Remote IRR was clear before reprogramming the
* ioapic I don't trust the Remote IRR bit to be
* completey accurate.
*
* However there appears to be no other way to plug
* this race, so if the Remote IRR bit is not
* accurate and is causing problems then it is a hardware bug
* and you can go talk to the chipset vendor about it.
*/
if (!io_apic_level_ack_pending(data->chip_data))
irq_move_masked_irq(data);
unmask_ioapic_irq(data);
}
}
#else
static inline bool ioapic_irqd_mask(struct irq_data *data)
{
return false;
}
static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
{
}
#endif
static void ioapic_ack_level(struct irq_data *irq_data)
{
struct irq_cfg *cfg = irqd_cfg(irq_data);
unsigned long v;
bool masked;
int i;
irq_complete_move(cfg);
masked = ioapic_irqd_mask(irq_data);
/*
* It appears there is an erratum which affects at least version 0x11
* of I/O APIC (that's the 82093AA and cores integrated into various
* chipsets). Under certain conditions a level-triggered interrupt is
* erroneously delivered as edge-triggered one but the respective IRR
* bit gets set nevertheless. As a result the I/O unit expects an EOI
* message but it will never arrive and further interrupts are blocked
* from the source. The exact reason is so far unknown, but the
* phenomenon was observed when two consecutive interrupt requests
* from a given source get delivered to the same CPU and the source is
* temporarily disabled in between.
*
* A workaround is to simulate an EOI message manually. We achieve it
* by setting the trigger mode to edge and then to level when the edge
* trigger mode gets detected in the TMR of a local APIC for a
* level-triggered interrupt. We mask the source for the time of the
* operation to prevent an edge-triggered interrupt escaping meanwhile.
* The idea is from Manfred Spraul. --macro
*
* Also in the case when cpu goes offline, fixup_irqs() will forward
* any unhandled interrupt on the offlined cpu to the new cpu
* destination that is handling the corresponding interrupt. This
* interrupt forwarding is done via IPI's. Hence, in this case also
* level-triggered io-apic interrupt will be seen as an edge
* interrupt in the IRR. And we can't rely on the cpu's EOI
* to be broadcasted to the IO-APIC's which will clear the remoteIRR
* corresponding to the level-triggered interrupt. Hence on IO-APIC's
* supporting EOI register, we do an explicit EOI to clear the
* remote IRR and on IO-APIC's which don't have an EOI register,
* we use the above logic (mask+edge followed by unmask+level) from
* Manfred Spraul to clear the remote IRR.
*/
i = cfg->vector;
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
/*
* We must acknowledge the irq before we move it or the acknowledge will
* not propagate properly.
*/
ack_APIC_irq();
/*
* Tail end of clearing remote IRR bit (either by delivering the EOI
* message via io-apic EOI register write or simulating it using
* mask+edge followed by unnask+level logic) manually when the
* level triggered interrupt is seen as the edge triggered interrupt
* at the cpu.
*/
if (!(v & (1 << (i & 0x1f)))) {
atomic_inc(&irq_mis_count);
eoi_ioapic_pin(cfg->vector, irq_data->chip_data);
}
ioapic_irqd_unmask(irq_data, masked);
}
static void ioapic_ir_ack_level(struct irq_data *irq_data)
{
struct mp_chip_data *data = irq_data->chip_data;
/*
* Intr-remapping uses pin number as the virtual vector
* in the RTE. Actual vector is programmed in
* intr-remapping table entry. Hence for the io-apic
* EOI we use the pin number.
*/
ack_APIC_irq();
eoi_ioapic_pin(data->entry.vector, data);
}
static void ioapic_configure_entry(struct irq_data *irqd)
{
struct mp_chip_data *mpd = irqd->chip_data;
struct irq_cfg *cfg = irqd_cfg(irqd);
struct irq_pin_list *entry;
/*
* Only update when the parent is the vector domain, don't touch it
* if the parent is the remapping domain. Check the installed
* ioapic chip to verify that.
*/
if (irqd->chip == &ioapic_chip) {
mpd->entry.dest = cfg->dest_apicid;
mpd->entry.vector = cfg->vector;
}
for_each_irq_pin(entry, mpd->irq_2_pin)
__ioapic_write_entry(entry->apic, entry->pin, mpd->entry);
}
static int ioapic_set_affinity(struct irq_data *irq_data,
const struct cpumask *mask, bool force)
{
struct irq_data *parent = irq_data->parent_data;
unsigned long flags;
int ret;
ret = parent->chip->irq_set_affinity(parent, mask, force);
raw_spin_lock_irqsave(&ioapic_lock, flags);
if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE)
ioapic_configure_entry(irq_data);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return ret;
}
static struct irq_chip ioapic_chip __read_mostly = {
.name = "IO-APIC",
.irq_startup = startup_ioapic_irq,
.irq_mask = mask_ioapic_irq,
.irq_unmask = unmask_ioapic_irq,
.irq_ack = irq_chip_ack_parent,
.irq_eoi = ioapic_ack_level,
.irq_set_affinity = ioapic_set_affinity,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static struct irq_chip ioapic_ir_chip __read_mostly = {
.name = "IR-IO-APIC",
.irq_startup = startup_ioapic_irq,
.irq_mask = mask_ioapic_irq,
.irq_unmask = unmask_ioapic_irq,
.irq_ack = irq_chip_ack_parent,
.irq_eoi = ioapic_ir_ack_level,
.irq_set_affinity = ioapic_set_affinity,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static inline void init_IO_APIC_traps(void)
{
struct irq_cfg *cfg;
unsigned int irq;
for_each_active_irq(irq) {
cfg = irq_cfg(irq);
if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
/*
* Hmm.. We don't have an entry for this,
* so default to an old-fashioned 8259
* interrupt if we can..
*/
if (irq < nr_legacy_irqs())
legacy_pic->make_irq(irq);
else
/* Strange. Oh, well.. */
irq_set_chip(irq, &no_irq_chip);
}
}
}
/*
* The local APIC irq-chip implementation:
*/
static void mask_lapic_irq(struct irq_data *data)
{
unsigned long v;
v = apic_read(APIC_LVT0);
apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
}
static void unmask_lapic_irq(struct irq_data *data)
{
unsigned long v;
v = apic_read(APIC_LVT0);
apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
}
static void ack_lapic_irq(struct irq_data *data)
{
ack_APIC_irq();
}
static struct irq_chip lapic_chip __read_mostly = {
.name = "local-APIC",
.irq_mask = mask_lapic_irq,
.irq_unmask = unmask_lapic_irq,
.irq_ack = ack_lapic_irq,
};
static void lapic_register_intr(int irq)
{
irq_clear_status_flags(irq, IRQ_LEVEL);
irq_set_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
"edge");
}
/*
* This looks a bit hackish but it's about the only one way of sending
* a few INTA cycles to 8259As and any associated glue logic. ICR does
* not support the ExtINT mode, unfortunately. We need to send these
* cycles as some i82489DX-based boards have glue logic that keeps the
* 8259A interrupt line asserted until INTA. --macro
*/
static inline void __init unlock_ExtINT_logic(void)
{
int apic, pin, i;
struct IO_APIC_route_entry entry0, entry1;
unsigned char save_control, save_freq_select;
pin = find_isa_irq_pin(8, mp_INT);
if (pin == -1) {
WARN_ON_ONCE(1);
return;
}
apic = find_isa_irq_apic(8, mp_INT);
if (apic == -1) {
WARN_ON_ONCE(1);
return;
}
entry0 = ioapic_read_entry(apic, pin);
clear_IO_APIC_pin(apic, pin);
memset(&entry1, 0, sizeof(entry1));
entry1.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
entry1.mask = IOAPIC_UNMASKED;
entry1.dest = hard_smp_processor_id();
entry1.delivery_mode = dest_ExtINT;
entry1.polarity = entry0.polarity;
entry1.trigger = IOAPIC_EDGE;
entry1.vector = 0;
ioapic_write_entry(apic, pin, entry1);
save_control = CMOS_READ(RTC_CONTROL);
save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
RTC_FREQ_SELECT);
CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
i = 100;
while (i-- > 0) {
mdelay(10);
if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
i -= 10;
}
CMOS_WRITE(save_control, RTC_CONTROL);
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
clear_IO_APIC_pin(apic, pin);
ioapic_write_entry(apic, pin, entry0);
}
static int disable_timer_pin_1 __initdata;
/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
static int __init disable_timer_pin_setup(char *arg)
{
disable_timer_pin_1 = 1;
return 0;
}
early_param("disable_timer_pin_1", disable_timer_pin_setup);
static int mp_alloc_timer_irq(int ioapic, int pin)
{
int irq = -1;
struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
if (domain) {
struct irq_alloc_info info;
ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 0, 0);
info.ioapic_id = mpc_ioapic_id(ioapic);
info.ioapic_pin = pin;
mutex_lock(&ioapic_mutex);
irq = alloc_isa_irq_from_domain(domain, 0, ioapic, pin, &info);
mutex_unlock(&ioapic_mutex);
}
return irq;
}
/*
* This code may look a bit paranoid, but it's supposed to cooperate with
* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
* is so screwy. Thanks to Brian Perkins for testing/hacking this beast
* fanatically on his truly buggy board.
*
* FIXME: really need to revamp this for all platforms.
*/
static inline void __init check_timer(void)
{
struct irq_data *irq_data = irq_get_irq_data(0);
struct mp_chip_data *data = irq_data->chip_data;
struct irq_cfg *cfg = irqd_cfg(irq_data);
int node = cpu_to_node(0);
int apic1, pin1, apic2, pin2;
unsigned long flags;
int no_pin1 = 0;
local_irq_save(flags);
/*
* get/set the timer IRQ vector:
*/
legacy_pic->mask(0);
/*
* As IRQ0 is to be enabled in the 8259A, the virtual
* wire has to be disabled in the local APIC. Also
* timer interrupts need to be acknowledged manually in
* the 8259A for the i82489DX when using the NMI
* watchdog as that APIC treats NMIs as level-triggered.
* The AEOI mode will finish them in the 8259A
* automatically.
*/
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
legacy_pic->init(1);
pin1 = find_isa_irq_pin(0, mp_INT);
apic1 = find_isa_irq_apic(0, mp_INT);
pin2 = ioapic_i8259.pin;
apic2 = ioapic_i8259.apic;
apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
"apic1=%d pin1=%d apic2=%d pin2=%d\n",
cfg->vector, apic1, pin1, apic2, pin2);
/*
* Some BIOS writers are clueless and report the ExtINTA
* I/O APIC input from the cascaded 8259A as the timer
* interrupt input. So just in case, if only one pin
* was found above, try it both directly and through the
* 8259A.
*/
if (pin1 == -1) {
panic_if_irq_remap("BIOS bug: timer not connected to IO-APIC");
pin1 = pin2;
apic1 = apic2;
no_pin1 = 1;
} else if (pin2 == -1) {
pin2 = pin1;
apic2 = apic1;
}
if (pin1 != -1) {
/* Ok, does IRQ0 through the IOAPIC work? */
if (no_pin1) {
mp_alloc_timer_irq(apic1, pin1);
} else {
/*
* for edge trigger, it's already unmasked,
* so only need to unmask if it is level-trigger
* do we really have level trigger timer?
*/
int idx;
idx = find_irq_entry(apic1, pin1, mp_INT);
if (idx != -1 && irq_trigger(idx))
unmask_ioapic_irq(irq_get_irq_data(0));
}
irq_domain_deactivate_irq(irq_data);
irq_domain_activate_irq(irq_data, false);
if (timer_irq_works()) {
if (disable_timer_pin_1 > 0)
clear_IO_APIC_pin(0, pin1);
goto out;
}
panic_if_irq_remap("timer doesn't work through Interrupt-remapped IO-APIC");
local_irq_disable();
clear_IO_APIC_pin(apic1, pin1);
if (!no_pin1)
apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
"8254 timer not connected to IO-APIC\n");
apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
"(IRQ0) through the 8259A ...\n");
apic_printk(APIC_QUIET, KERN_INFO
"..... (found apic %d pin %d) ...\n", apic2, pin2);
/*
* legacy devices should be connected to IO APIC #0
*/
replace_pin_at_irq_node(data, node, apic1, pin1, apic2, pin2);
irq_domain_deactivate_irq(irq_data);
irq_domain_activate_irq(irq_data, false);
legacy_pic->unmask(0);
if (timer_irq_works()) {
apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
goto out;
}
/*
* Cleanup, just in case ...
*/
local_irq_disable();
legacy_pic->mask(0);
clear_IO_APIC_pin(apic2, pin2);
apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
}
apic_printk(APIC_QUIET, KERN_INFO
"...trying to set up timer as Virtual Wire IRQ...\n");
lapic_register_intr(0);
apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
legacy_pic->unmask(0);
if (timer_irq_works()) {
apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
goto out;
}
local_irq_disable();
legacy_pic->mask(0);
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
apic_printk(APIC_QUIET, KERN_INFO
"...trying to set up timer as ExtINT IRQ...\n");
legacy_pic->init(0);
legacy_pic->make_irq(0);
apic_write(APIC_LVT0, APIC_DM_EXTINT);
unlock_ExtINT_logic();
if (timer_irq_works()) {
apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
goto out;
}
local_irq_disable();
apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
if (apic_is_x2apic_enabled())
apic_printk(APIC_QUIET, KERN_INFO
"Perhaps problem with the pre-enabled x2apic mode\n"
"Try booting with x2apic and interrupt-remapping disabled in the bios.\n");
panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
"report. Then try booting with the 'noapic' option.\n");
out:
local_irq_restore(flags);
}
/*
* Traditionally ISA IRQ2 is the cascade IRQ, and is not available
* to devices. However there may be an I/O APIC pin available for
* this interrupt regardless. The pin may be left unconnected, but
* typically it will be reused as an ExtINT cascade interrupt for
* the master 8259A. In the MPS case such a pin will normally be
* reported as an ExtINT interrupt in the MP table. With ACPI
* there is no provision for ExtINT interrupts, and in the absence
* of an override it would be treated as an ordinary ISA I/O APIC
* interrupt, that is edge-triggered and unmasked by default. We
* used to do this, but it caused problems on some systems because
* of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
* the same ExtINT cascade interrupt to drive the local APIC of the
* bootstrap processor. Therefore we refrain from routing IRQ2 to
* the I/O APIC in all cases now. No actual device should request
* it anyway. --macro
*/
#define PIC_IRQS (1UL << PIC_CASCADE_IR)
static int mp_irqdomain_create(int ioapic)
{
struct irq_alloc_info info;
struct irq_domain *parent;
int hwirqs = mp_ioapic_pin_count(ioapic);
struct ioapic *ip = &ioapics[ioapic];
struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
struct fwnode_handle *fn;
char *name = "IO-APIC";
if (cfg->type == IOAPIC_DOMAIN_INVALID)
return 0;
init_irq_alloc_info(&info, NULL);
info.type = X86_IRQ_ALLOC_TYPE_IOAPIC;
info.ioapic_id = mpc_ioapic_id(ioapic);
parent = irq_remapping_get_ir_irq_domain(&info);
if (!parent)
parent = x86_vector_domain;
else
name = "IO-APIC-IR";
/* Handle device tree enumerated APICs proper */
if (cfg->dev) {
fn = of_node_to_fwnode(cfg->dev);
} else {
fn = irq_domain_alloc_named_id_fwnode(name, ioapic);
if (!fn)
return -ENOMEM;
}
ip->irqdomain = irq_domain_create_linear(fn, hwirqs, cfg->ops,
(void *)(long)ioapic);
/* Release fw handle if it was allocated above */
if (!cfg->dev)
irq_domain_free_fwnode(fn);
if (!ip->irqdomain)
return -ENOMEM;
ip->irqdomain->parent = parent;
if (cfg->type == IOAPIC_DOMAIN_LEGACY ||
cfg->type == IOAPIC_DOMAIN_STRICT)
ioapic_dynirq_base = max(ioapic_dynirq_base,
gsi_cfg->gsi_end + 1);
return 0;
}
static void ioapic_destroy_irqdomain(int idx)
{
if (ioapics[idx].irqdomain) {
irq_domain_remove(ioapics[idx].irqdomain);
ioapics[idx].irqdomain = NULL;
}
}
void __init setup_IO_APIC(void)
{
int ioapic;
if (skip_ioapic_setup || !nr_ioapics)
return;
io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;
apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
for_each_ioapic(ioapic)
BUG_ON(mp_irqdomain_create(ioapic));
/*
* Set up IO-APIC IRQ routing.
*/
x86_init.mpparse.setup_ioapic_ids();
sync_Arb_IDs();
setup_IO_APIC_irqs();
init_IO_APIC_traps();
if (nr_legacy_irqs())
check_timer();
ioapic_initialized = 1;
}
static void resume_ioapic_id(int ioapic_idx)
{
unsigned long flags;
union IO_APIC_reg_00 reg_00;
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic_idx, 0);
if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx)) {
reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
io_apic_write(ioapic_idx, 0, reg_00.raw);
}
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
}
static void ioapic_resume(void)
{
int ioapic_idx;
for_each_ioapic_reverse(ioapic_idx)
resume_ioapic_id(ioapic_idx);
restore_ioapic_entries();
}
static struct syscore_ops ioapic_syscore_ops = {
.suspend = save_ioapic_entries,
.resume = ioapic_resume,
};
static int __init ioapic_init_ops(void)
{
register_syscore_ops(&ioapic_syscore_ops);
return 0;
}
device_initcall(ioapic_init_ops);
static int io_apic_get_redir_entries(int ioapic)
{
union IO_APIC_reg_01 reg_01;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(ioapic, 1);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
/* The register returns the maximum index redir index
* supported, which is one less than the total number of redir
* entries.
*/
return reg_01.bits.entries + 1;
}
unsigned int arch_dynirq_lower_bound(unsigned int from)
{
/*
* dmar_alloc_hwirq() may be called before setup_IO_APIC(), so use
* gsi_top if ioapic_dynirq_base hasn't been initialized yet.
*/
return ioapic_initialized ? ioapic_dynirq_base : gsi_top;
}
#ifdef CONFIG_X86_32
static int io_apic_get_unique_id(int ioapic, int apic_id)
{
union IO_APIC_reg_00 reg_00;
static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
physid_mask_t tmp;
unsigned long flags;
int i = 0;
/*
* The P4 platform supports up to 256 APIC IDs on two separate APIC
* buses (one for LAPICs, one for IOAPICs), where predecessors only
* supports up to 16 on one shared APIC bus.
*
* TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
* advantage of new APIC bus architecture.
*/
if (physids_empty(apic_id_map))
apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic, 0);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
if (apic_id >= get_physical_broadcast()) {
printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
"%d\n", ioapic, apic_id, reg_00.bits.ID);
apic_id = reg_00.bits.ID;
}
/*
* Every APIC in a system must have a unique ID or we get lots of nice
* 'stuck on smp_invalidate_needed IPI wait' messages.
*/
if (apic->check_apicid_used(&apic_id_map, apic_id)) {
for (i = 0; i < get_physical_broadcast(); i++) {
if (!apic->check_apicid_used(&apic_id_map, i))
break;
}
if (i == get_physical_broadcast())
panic("Max apic_id exceeded!\n");
printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
"trying %d\n", ioapic, apic_id, i);
apic_id = i;
}
apic->apicid_to_cpu_present(apic_id, &tmp);
physids_or(apic_id_map, apic_id_map, tmp);
if (reg_00.bits.ID != apic_id) {
reg_00.bits.ID = apic_id;
raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(ioapic, 0, reg_00.raw);
reg_00.raw = io_apic_read(ioapic, 0);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
/* Sanity check */
if (reg_00.bits.ID != apic_id) {
pr_err("IOAPIC[%d]: Unable to change apic_id!\n",
ioapic);
return -1;
}
}
apic_printk(APIC_VERBOSE, KERN_INFO
"IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
return apic_id;
}
static u8 io_apic_unique_id(int idx, u8 id)
{
if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
!APIC_XAPIC(boot_cpu_apic_version))
return io_apic_get_unique_id(idx, id);
else
return id;
}
#else
static u8 io_apic_unique_id(int idx, u8 id)
{
union IO_APIC_reg_00 reg_00;
DECLARE_BITMAP(used, 256);
unsigned long flags;
u8 new_id;
int i;
bitmap_zero(used, 256);
for_each_ioapic(i)
__set_bit(mpc_ioapic_id(i), used);
/* Hand out the requested id if available */
if (!test_bit(id, used))
return id;
/*
* Read the current id from the ioapic and keep it if
* available.
*/
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(idx, 0);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
new_id = reg_00.bits.ID;
if (!test_bit(new_id, used)) {
apic_printk(APIC_VERBOSE, KERN_INFO
"IOAPIC[%d]: Using reg apic_id %d instead of %d\n",
idx, new_id, id);
return new_id;
}
/*
* Get the next free id and write it to the ioapic.
*/
new_id = find_first_zero_bit(used, 256);
reg_00.bits.ID = new_id;
raw_spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(idx, 0, reg_00.raw);
reg_00.raw = io_apic_read(idx, 0);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
/* Sanity check */
BUG_ON(reg_00.bits.ID != new_id);
return new_id;
}
#endif
static int io_apic_get_version(int ioapic)
{
union IO_APIC_reg_01 reg_01;
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_01.raw = io_apic_read(ioapic, 1);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return reg_01.bits.version;
}
int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
{
int ioapic, pin, idx;
if (skip_ioapic_setup)
return -1;
ioapic = mp_find_ioapic(gsi);
if (ioapic < 0)
return -1;
pin = mp_find_ioapic_pin(ioapic, gsi);
if (pin < 0)
return -1;
idx = find_irq_entry(ioapic, pin, mp_INT);
if (idx < 0)
return -1;
*trigger = irq_trigger(idx);
*polarity = irq_polarity(idx);
return 0;
}
/*
* This function updates target affinity of IOAPIC interrupts to include
* the CPUs which came online during SMP bringup.
*/
#define IOAPIC_RESOURCE_NAME_SIZE 11
static struct resource *ioapic_resources;
static struct resource * __init ioapic_setup_resources(void)
{
unsigned long n;
struct resource *res;
char *mem;
int i;
if (nr_ioapics == 0)
return NULL;
n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
n *= nr_ioapics;
mem = alloc_bootmem(n);
res = (void *)mem;
mem += sizeof(struct resource) * nr_ioapics;
for_each_ioapic(i) {
res[i].name = mem;
res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
mem += IOAPIC_RESOURCE_NAME_SIZE;
ioapics[i].iomem_res = &res[i];
}
ioapic_resources = res;
return res;
}
void __init io_apic_init_mappings(void)
{
unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
struct resource *ioapic_res;
int i;
ioapic_res = ioapic_setup_resources();
for_each_ioapic(i) {
if (smp_found_config) {
ioapic_phys = mpc_ioapic_addr(i);
#ifdef CONFIG_X86_32
if (!ioapic_phys) {
printk(KERN_ERR
"WARNING: bogus zero IO-APIC "
"address found in MPTABLE, "
"disabling IO/APIC support!\n");
smp_found_config = 0;
skip_ioapic_setup = 1;
goto fake_ioapic_page;
}
#endif
} else {
#ifdef CONFIG_X86_32
fake_ioapic_page:
#endif
ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
ioapic_phys = __pa(ioapic_phys);
}
set_fixmap_nocache(idx, ioapic_phys);
apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
__fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
ioapic_phys);
idx++;
ioapic_res->start = ioapic_phys;
ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
ioapic_res++;
}
}
void __init ioapic_insert_resources(void)
{
int i;
struct resource *r = ioapic_resources;
if (!r) {
if (nr_ioapics > 0)
printk(KERN_ERR
"IO APIC resources couldn't be allocated.\n");
return;
}
for_each_ioapic(i) {
insert_resource(&iomem_resource, r);
r++;
}
}
int mp_find_ioapic(u32 gsi)
{
int i;
if (nr_ioapics == 0)
return -1;
/* Find the IOAPIC that manages this GSI. */
for_each_ioapic(i) {
struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i);
if (gsi >= gsi_cfg->gsi_base && gsi <= gsi_cfg->gsi_end)
return i;
}
printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
return -1;
}
int mp_find_ioapic_pin(int ioapic, u32 gsi)
{
struct mp_ioapic_gsi *gsi_cfg;
if (WARN_ON(ioapic < 0))
return -1;
gsi_cfg = mp_ioapic_gsi_routing(ioapic);
if (WARN_ON(gsi > gsi_cfg->gsi_end))
return -1;
return gsi - gsi_cfg->gsi_base;
}
static int bad_ioapic_register(int idx)
{
union IO_APIC_reg_00 reg_00;
union IO_APIC_reg_01 reg_01;
union IO_APIC_reg_02 reg_02;
reg_00.raw = io_apic_read(idx, 0);
reg_01.raw = io_apic_read(idx, 1);
reg_02.raw = io_apic_read(idx, 2);
if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) {
pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n",
mpc_ioapic_addr(idx));
return 1;
}
return 0;
}
static int find_free_ioapic_entry(void)
{
int idx;
for (idx = 0; idx < MAX_IO_APICS; idx++)
if (ioapics[idx].nr_registers == 0)
return idx;
return MAX_IO_APICS;
}
/**
* mp_register_ioapic - Register an IOAPIC device
* @id: hardware IOAPIC ID
* @address: physical address of IOAPIC register area
* @gsi_base: base of GSI associated with the IOAPIC
* @cfg: configuration information for the IOAPIC
*/
int mp_register_ioapic(int id, u32 address, u32 gsi_base,
struct ioapic_domain_cfg *cfg)
{
bool hotplug = !!ioapic_initialized;
struct mp_ioapic_gsi *gsi_cfg;
int idx, ioapic, entries;
u32 gsi_end;
if (!address) {
pr_warn("Bogus (zero) I/O APIC address found, skipping!\n");
return -EINVAL;
}
for_each_ioapic(ioapic)
if (ioapics[ioapic].mp_config.apicaddr == address) {
pr_warn("address 0x%x conflicts with IOAPIC%d\n",
address, ioapic);
return -EEXIST;
}
idx = find_free_ioapic_entry();
if (idx >= MAX_IO_APICS) {
pr_warn("Max # of I/O APICs (%d) exceeded (found %d), skipping\n",
MAX_IO_APICS, idx);
return -ENOSPC;
}
ioapics[idx].mp_config.type = MP_IOAPIC;
ioapics[idx].mp_config.flags = MPC_APIC_USABLE;
ioapics[idx].mp_config.apicaddr = address;
set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
if (bad_ioapic_register(idx)) {
clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
return -ENODEV;
}
ioapics[idx].mp_config.apicid = io_apic_unique_id(idx, id);
ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
/*
* Build basic GSI lookup table to facilitate gsi->io_apic lookups
* and to prevent reprogramming of IOAPIC pins (PCI GSIs).
*/
entries = io_apic_get_redir_entries(idx);
gsi_end = gsi_base + entries - 1;
for_each_ioapic(ioapic) {
gsi_cfg = mp_ioapic_gsi_routing(ioapic);
if ((gsi_base >= gsi_cfg->gsi_base &&
gsi_base <= gsi_cfg->gsi_end) ||
(gsi_end >= gsi_cfg->gsi_base &&
gsi_end <= gsi_cfg->gsi_end)) {
pr_warn("GSI range [%u-%u] for new IOAPIC conflicts with GSI[%u-%u]\n",
gsi_base, gsi_end,
gsi_cfg->gsi_base, gsi_cfg->gsi_end);
clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
return -ENOSPC;
}
}
gsi_cfg = mp_ioapic_gsi_routing(idx);
gsi_cfg->gsi_base = gsi_base;
gsi_cfg->gsi_end = gsi_end;
ioapics[idx].irqdomain = NULL;
ioapics[idx].irqdomain_cfg = *cfg;
/*
* If mp_register_ioapic() is called during early boot stage when
* walking ACPI/SFI/DT tables, it's too early to create irqdomain,
* we are still using bootmem allocator. So delay it to setup_IO_APIC().
*/
if (hotplug) {
if (mp_irqdomain_create(idx)) {
clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
return -ENOMEM;
}
alloc_ioapic_saved_registers(idx);
}
if (gsi_cfg->gsi_end >= gsi_top)
gsi_top = gsi_cfg->gsi_end + 1;
if (nr_ioapics <= idx)
nr_ioapics = idx + 1;
/* Set nr_registers to mark entry present */
ioapics[idx].nr_registers = entries;
pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n",
idx, mpc_ioapic_id(idx),
mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
gsi_cfg->gsi_base, gsi_cfg->gsi_end);
return 0;
}
int mp_unregister_ioapic(u32 gsi_base)
{
int ioapic, pin;
int found = 0;
for_each_ioapic(ioapic)
if (ioapics[ioapic].gsi_config.gsi_base == gsi_base) {
found = 1;
break;
}
if (!found) {
pr_warn("can't find IOAPIC for GSI %d\n", gsi_base);
return -ENODEV;
}
for_each_pin(ioapic, pin) {
u32 gsi = mp_pin_to_gsi(ioapic, pin);
int irq = mp_map_gsi_to_irq(gsi, 0, NULL);
struct mp_chip_data *data;
if (irq >= 0) {
data = irq_get_chip_data(irq);
if (data && data->count) {
pr_warn("pin%d on IOAPIC%d is still in use.\n",
pin, ioapic);
return -EBUSY;
}
}
}
/* Mark entry not present */
ioapics[ioapic].nr_registers = 0;
ioapic_destroy_irqdomain(ioapic);
free_ioapic_saved_registers(ioapic);
if (ioapics[ioapic].iomem_res)
release_resource(ioapics[ioapic].iomem_res);
clear_fixmap(FIX_IO_APIC_BASE_0 + ioapic);
memset(&ioapics[ioapic], 0, sizeof(ioapics[ioapic]));
return 0;
}
int mp_ioapic_registered(u32 gsi_base)
{
int ioapic;
for_each_ioapic(ioapic)
if (ioapics[ioapic].gsi_config.gsi_base == gsi_base)
return 1;
return 0;
}
static void mp_irqdomain_get_attr(u32 gsi, struct mp_chip_data *data,
struct irq_alloc_info *info)
{
if (info && info->ioapic_valid) {
data->trigger = info->ioapic_trigger;
data->polarity = info->ioapic_polarity;
} else if (acpi_get_override_irq(gsi, &data->trigger,
&data->polarity) < 0) {
/* PCI interrupts are always active low level triggered. */
data->trigger = IOAPIC_LEVEL;
data->polarity = IOAPIC_POL_LOW;
}
}
static void mp_setup_entry(struct irq_cfg *cfg, struct mp_chip_data *data,
struct IO_APIC_route_entry *entry)
{
memset(entry, 0, sizeof(*entry));
entry->delivery_mode = apic->irq_delivery_mode;
entry->dest_mode = apic->irq_dest_mode;
entry->dest = cfg->dest_apicid;
entry->vector = cfg->vector;
entry->trigger = data->trigger;
entry->polarity = data->polarity;
/*
* Mask level triggered irqs. Edge triggered irqs are masked
* by the irq core code in case they fire.
*/
if (data->trigger == IOAPIC_LEVEL)
entry->mask = IOAPIC_MASKED;
else
entry->mask = IOAPIC_UNMASKED;
}
int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
int ret, ioapic, pin;
struct irq_cfg *cfg;
struct irq_data *irq_data;
struct mp_chip_data *data;
struct irq_alloc_info *info = arg;
unsigned long flags;
if (!info || nr_irqs > 1)
return -EINVAL;
irq_data = irq_domain_get_irq_data(domain, virq);
if (!irq_data)
return -EINVAL;
ioapic = mp_irqdomain_ioapic_idx(domain);
pin = info->ioapic_pin;
if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0)
return -EEXIST;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
info->ioapic_entry = &data->entry;
ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
if (ret < 0) {
kfree(data);
return ret;
}
INIT_LIST_HEAD(&data->irq_2_pin);
irq_data->hwirq = info->ioapic_pin;
irq_data->chip = (domain->parent == x86_vector_domain) ?
&ioapic_chip : &ioapic_ir_chip;
irq_data->chip_data = data;
mp_irqdomain_get_attr(mp_pin_to_gsi(ioapic, pin), data, info);
cfg = irqd_cfg(irq_data);
add_pin_to_irq_node(data, ioapic_alloc_attr_node(info), ioapic, pin);
local_irq_save(flags);
if (info->ioapic_entry)
mp_setup_entry(cfg, data, info->ioapic_entry);
mp_register_handler(virq, data->trigger);
if (virq < nr_legacy_irqs())
legacy_pic->mask(virq);
local_irq_restore(flags);
apic_printk(APIC_VERBOSE, KERN_DEBUG
"IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i Dest:%d)\n",
ioapic, mpc_ioapic_id(ioapic), pin, cfg->vector,
virq, data->trigger, data->polarity, cfg->dest_apicid);
return 0;
}
void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs)
{
struct irq_data *irq_data;
struct mp_chip_data *data;
BUG_ON(nr_irqs != 1);
irq_data = irq_domain_get_irq_data(domain, virq);
if (irq_data && irq_data->chip_data) {
data = irq_data->chip_data;
__remove_pin_from_irq(data, mp_irqdomain_ioapic_idx(domain),
(int)irq_data->hwirq);
WARN_ON(!list_empty(&data->irq_2_pin));
kfree(irq_data->chip_data);
}
irq_domain_free_irqs_top(domain, virq, nr_irqs);
}
int mp_irqdomain_activate(struct irq_domain *domain,
struct irq_data *irq_data, bool reserve)
{
unsigned long flags;
raw_spin_lock_irqsave(&ioapic_lock, flags);
ioapic_configure_entry(irq_data);
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
return 0;
}
void mp_irqdomain_deactivate(struct irq_domain *domain,
struct irq_data *irq_data)
{
/* It won't be called for IRQ with multiple IOAPIC pins associated */
ioapic_mask_entry(mp_irqdomain_ioapic_idx(domain),
(int)irq_data->hwirq);
}
int mp_irqdomain_ioapic_idx(struct irq_domain *domain)
{
return (int)(long)domain->host_data;
}
const struct irq_domain_ops mp_ioapic_irqdomain_ops = {
.alloc = mp_irqdomain_alloc,
.free = mp_irqdomain_free,
.activate = mp_irqdomain_activate,
.deactivate = mp_irqdomain_deactivate,
};
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