[tip:x86/mrst] x86, pic: Make use of legacy_pic abstraction

From: tip-bot for Jacob Pan
Date: Fri Feb 19 2010 - 20:29:54 EST

Commit-ID: b81bb373a7e832a43921356aa1291044d7f52fb1
Gitweb: http://git.kernel.org/tip/b81bb373a7e832a43921356aa1291044d7f52fb1
Author: Jacob Pan <jacob.jun.pan@xxxxxxxxx>
AuthorDate: Mon, 9 Nov 2009 11:27:04 -0800
Committer: H. Peter Anvin <hpa@xxxxxxxxx>
CommitDate: Fri, 19 Feb 2010 16:25:17 -0800

x86, pic: Make use of legacy_pic abstraction

This patch replaces legacy PIC-related global variable and functions
with the new legacy_pic abstraction.

Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxx>
LKML-Reference: <43F901BD926A4E43B106BF17856F07559FB80D04@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxx>
---
arch/x86/include/asm/hw_irq.h | 7 -----
arch/x86/include/asm/i8259.h | 8 -----
arch/x86/kernel/apic/apic.c | 8 +++---
arch/x86/kernel/apic/io_apic.c | 57 +++++++++++++++++++---------------------
arch/x86/kernel/apic/nmi.c | 2 +-
arch/x86/kernel/i8259.c | 21 ++++++++++-----
arch/x86/kernel/irqinit.c | 2 +-
arch/x86/kernel/smpboot.c | 5 ++-
arch/x86/kernel/visws_quirks.c | 14 ++++++---
9 files changed, 59 insertions(+), 65 deletions(-)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index eeac829..a929c9e 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -53,13 +53,6 @@ extern void threshold_interrupt(void);
extern void call_function_interrupt(void);
extern void call_function_single_interrupt(void);

-/* PIC specific functions */
-extern void disable_8259A_irq(unsigned int irq);
-extern void enable_8259A_irq(unsigned int irq);
-extern int i8259A_irq_pending(unsigned int irq);
-extern void make_8259A_irq(unsigned int irq);
-extern void init_8259A(int aeoi);
-
/* IOAPIC */
#define IO_APIC_IRQ(x) (((x) >= NR_IRQS_LEGACY) || ((1<<(x)) & io_apic_irqs))
extern unsigned long io_apic_irqs;
diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h
index e8a3e05..2832bab 100644
--- a/arch/x86/include/asm/i8259.h
+++ b/arch/x86/include/asm/i8259.h
@@ -26,11 +26,6 @@ extern unsigned int cached_irq_mask;

extern spinlock_t i8259A_lock;

-extern void init_8259A(int auto_eoi);
-extern void enable_8259A_irq(unsigned int irq);
-extern void disable_8259A_irq(unsigned int irq);
-extern unsigned int startup_8259A_irq(unsigned int irq);
-
/* the PIC may need a careful delay on some platforms, hence specific calls */
static inline unsigned char inb_pic(unsigned int port)
{
@@ -70,7 +65,4 @@ struct legacy_pic {
extern struct legacy_pic *legacy_pic;
extern struct legacy_pic null_legacy_pic;

-extern void mask_8259A(void);
-extern void unmask_8259A(void);
-
#endif /* _ASM_X86_I8259_H */
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index dfca210..94f22b1 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1390,7 +1390,7 @@ void __init enable_IR_x2apic(void)
}

local_irq_save(flags);
- mask_8259A();
+ legacy_pic->mask_all();
mask_IO_APIC_setup(ioapic_entries);

if (dmar_table_init_ret)
@@ -1422,7 +1422,7 @@ void __init enable_IR_x2apic(void)
nox2apic:
if (!ret) /* IR enabling failed */
restore_IO_APIC_setup(ioapic_entries);
- unmask_8259A();
+ legacy_pic->restore_mask();
local_irq_restore(flags);

out:
@@ -2018,7 +2018,7 @@ static int lapic_resume(struct sys_device *dev)
}

mask_IO_APIC_setup(ioapic_entries);
- mask_8259A();
+ legacy_pic->mask_all();
}

if (x2apic_mode)
@@ -2062,7 +2062,7 @@ static int lapic_resume(struct sys_device *dev)

if (intr_remapping_enabled) {
reenable_intr_remapping(x2apic_mode);
- unmask_8259A();
+ legacy_pic->restore_mask();
restore_IO_APIC_setup(ioapic_entries);
free_ioapic_entries(ioapic_entries);
}
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 75265ab..1704cd8 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -94,8 +94,6 @@ struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
/* # of MP IRQ source entries */
int mp_irq_entries;

-/* Number of legacy interrupts */
-static int nr_legacy_irqs __read_mostly = NR_IRQS_LEGACY;
/* GSI interrupts */
static int nr_irqs_gsi = NR_IRQS_LEGACY;

@@ -147,7 +145,6 @@ static struct irq_cfg irq_cfgx[NR_IRQS];

void __init io_apic_disable_legacy(void)
{
- nr_legacy_irqs = 0;
nr_irqs_gsi = 0;
}

@@ -164,13 +161,13 @@ int __init arch_early_irq_init(void)
node= cpu_to_node(boot_cpu_id);

for (i = 0; i < count; i++) {
- if (i < nr_legacy_irqs)
+ if (i < legacy_pic->nr_legacy_irqs)
cfg[i].vector = IRQ0_VECTOR + i;
desc = irq_to_desc(i);
desc->chip_data = &cfg[i];
zalloc_cpumask_var_node(&cfg[i].domain, GFP_NOWAIT, node);
zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_NOWAIT, node);
- if (i < nr_legacy_irqs)
+ if (i < legacy_pic->nr_legacy_irqs)
cpumask_setall(cfg[i].domain);
}

@@ -850,7 +847,7 @@ static int __init find_isa_irq_apic(int irq, int type)
*/
static int EISA_ELCR(unsigned int irq)
{
- if (irq < nr_legacy_irqs) {
+ if (irq < legacy_pic->nr_legacy_irqs) {
unsigned int port = 0x4d0 + (irq >> 3);
return (inb(port) >> (irq & 7)) & 1;
}
@@ -1446,8 +1443,8 @@ static void setup_IO_APIC_irq(int apic_id, int pin, unsigned int irq, struct irq
}

ioapic_register_intr(irq, desc, trigger);
- if (irq < nr_legacy_irqs)
- disable_8259A_irq(irq);
+ if (irq < legacy_pic->nr_legacy_irqs)
+ legacy_pic->chip->mask(irq);

ioapic_write_entry(apic_id, pin, entry);
}
@@ -1810,7 +1807,7 @@ __apicdebuginit(void) print_PIC(void)
unsigned int v;
unsigned long flags;

- if (!nr_legacy_irqs)
+ if (!legacy_pic->nr_legacy_irqs)
return;

printk(KERN_DEBUG "\nprinting PIC contents\n");
@@ -1894,7 +1891,7 @@ void __init enable_IO_APIC(void)
nr_ioapic_registers[apic] = reg_01.bits.entries+1;
}

- if (!nr_legacy_irqs)
+ if (!legacy_pic->nr_legacy_irqs)
return;

for(apic = 0; apic < nr_ioapics; apic++) {
@@ -1951,7 +1948,7 @@ void disable_IO_APIC(void)
*/
clear_IO_APIC();

- if (!nr_legacy_irqs)
+ if (!legacy_pic->nr_legacy_irqs)
return;

/*
@@ -2184,9 +2181,9 @@ static unsigned int startup_ioapic_irq(unsigned int irq)
struct irq_cfg *cfg;

spin_lock_irqsave(&ioapic_lock, flags);
- if (irq < nr_legacy_irqs) {
- disable_8259A_irq(irq);
- if (i8259A_irq_pending(irq))
+ if (irq < legacy_pic->nr_legacy_irqs) {
+ legacy_pic->chip->mask(irq);
+ if (legacy_pic->irq_pending(irq))
was_pending = 1;
}
cfg = irq_cfg(irq);
@@ -2719,8 +2716,8 @@ static inline void init_IO_APIC_traps(void)
* so default to an old-fashioned 8259
* interrupt if we can..
*/
- if (irq < nr_legacy_irqs)
- make_8259A_irq(irq);
+ if (irq < legacy_pic->nr_legacy_irqs)
+ legacy_pic->make_irq(irq);
else
/* Strange. Oh, well.. */
desc->chip = &no_irq_chip;
@@ -2877,7 +2874,7 @@ static inline void __init check_timer(void)
/*
* get/set the timer IRQ vector:
*/
- disable_8259A_irq(0);
+ legacy_pic->chip->mask(0);
assign_irq_vector(0, cfg, apic->target_cpus());

/*
@@ -2890,7 +2887,7 @@ static inline void __init check_timer(void)
* automatically.
*/
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
- init_8259A(1);
+ legacy_pic->init(1);
#ifdef CONFIG_X86_32
{
unsigned int ver;
@@ -2949,7 +2946,7 @@ static inline void __init check_timer(void)
if (timer_irq_works()) {
if (nmi_watchdog == NMI_IO_APIC) {
setup_nmi();
- enable_8259A_irq(0);
+ legacy_pic->chip->unmask(0);
}
if (disable_timer_pin_1 > 0)
clear_IO_APIC_pin(0, pin1);
@@ -2972,14 +2969,14 @@ static inline void __init check_timer(void)
*/
replace_pin_at_irq_node(cfg, node, apic1, pin1, apic2, pin2);
setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
- enable_8259A_irq(0);
+ legacy_pic->chip->unmask(0);
if (timer_irq_works()) {
apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
timer_through_8259 = 1;
if (nmi_watchdog == NMI_IO_APIC) {
- disable_8259A_irq(0);
+ legacy_pic->chip->mask(0);
setup_nmi();
- enable_8259A_irq(0);
+ legacy_pic->chip->unmask(0);
}
goto out;
}
@@ -2987,7 +2984,7 @@ static inline void __init check_timer(void)
* Cleanup, just in case ...
*/
local_irq_disable();
- disable_8259A_irq(0);
+ legacy_pic->chip->mask(0);
clear_IO_APIC_pin(apic2, pin2);
apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
}
@@ -3006,22 +3003,22 @@ static inline void __init check_timer(void)

lapic_register_intr(0, desc);
apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
- enable_8259A_irq(0);
+ legacy_pic->chip->unmask(0);

if (timer_irq_works()) {
apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
goto out;
}
local_irq_disable();
- disable_8259A_irq(0);
+ legacy_pic->chip->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");

- init_8259A(0);
- make_8259A_irq(0);
+ legacy_pic->init(0);
+ legacy_pic->make_irq(0);
apic_write(APIC_LVT0, APIC_DM_EXTINT);

unlock_ExtINT_logic();
@@ -3063,7 +3060,7 @@ void __init setup_IO_APIC(void)
/*
* calling enable_IO_APIC() is moved to setup_local_APIC for BP
*/
- io_apic_irqs = nr_legacy_irqs ? ~PIC_IRQS : ~0UL;
+ io_apic_irqs = legacy_pic->nr_legacy_irqs ? ~PIC_IRQS : ~0UL;

apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
/*
@@ -3074,7 +3071,7 @@ void __init setup_IO_APIC(void)
sync_Arb_IDs();
setup_IO_APIC_irqs();
init_IO_APIC_traps();
- if (nr_legacy_irqs)
+ if (legacy_pic->nr_legacy_irqs)
check_timer();
}

@@ -3875,7 +3872,7 @@ static int __io_apic_set_pci_routing(struct device *dev, int irq,
/*
* IRQs < 16 are already in the irq_2_pin[] map
*/
- if (irq >= nr_legacy_irqs) {
+ if (irq >= legacy_pic->nr_legacy_irqs) {
cfg = desc->chip_data;
if (add_pin_to_irq_node_nopanic(cfg, node, ioapic, pin)) {
printk(KERN_INFO "can not add pin %d for irq %d\n",
diff --git a/arch/x86/kernel/apic/nmi.c b/arch/x86/kernel/apic/nmi.c
index 0159a69..3817739 100644
--- a/arch/x86/kernel/apic/nmi.c
+++ b/arch/x86/kernel/apic/nmi.c
@@ -177,7 +177,7 @@ int __init check_nmi_watchdog(void)
error:
if (nmi_watchdog == NMI_IO_APIC) {
if (!timer_through_8259)
- disable_8259A_irq(0);
+ legacy_pic->chip->mask(0);
on_each_cpu(__acpi_nmi_disable, NULL, 1);
}

diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index b80987c..1c790e7 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -34,6 +34,12 @@
static int i8259A_auto_eoi;
DEFINE_SPINLOCK(i8259A_lock);
static void mask_and_ack_8259A(unsigned int);
+static void mask_8259A(void);
+static void unmask_8259A(void);
+static void disable_8259A_irq(unsigned int irq);
+static void enable_8259A_irq(unsigned int irq);
+static void init_8259A(int auto_eoi);
+static int i8259A_irq_pending(unsigned int irq);

struct irq_chip i8259A_chip = {
.name = "XT-PIC",
@@ -63,7 +69,7 @@ unsigned int cached_irq_mask = 0xffff;
*/
unsigned long io_apic_irqs;

-void disable_8259A_irq(unsigned int irq)
+static void disable_8259A_irq(unsigned int irq)
{
unsigned int mask = 1 << irq;
unsigned long flags;
@@ -77,7 +83,7 @@ void disable_8259A_irq(unsigned int irq)
spin_unlock_irqrestore(&i8259A_lock, flags);
}

-void enable_8259A_irq(unsigned int irq)
+static void enable_8259A_irq(unsigned int irq)
{
unsigned int mask = ~(1 << irq);
unsigned long flags;
@@ -91,7 +97,7 @@ void enable_8259A_irq(unsigned int irq)
spin_unlock_irqrestore(&i8259A_lock, flags);
}

-int i8259A_irq_pending(unsigned int irq)
+static int i8259A_irq_pending(unsigned int irq)
{
unsigned int mask = 1<<irq;
unsigned long flags;
@@ -107,7 +113,7 @@ int i8259A_irq_pending(unsigned int irq)
return ret;
}

-void make_8259A_irq(unsigned int irq)
+static void make_8259A_irq(unsigned int irq)
{
disable_irq_nosync(irq);
io_apic_irqs &= ~(1<<irq);
@@ -281,7 +287,7 @@ static int __init i8259A_init_sysfs(void)

device_initcall(i8259A_init_sysfs);

-void mask_8259A(void)
+static void mask_8259A(void)
{
unsigned long flags;

@@ -293,7 +299,7 @@ void mask_8259A(void)
spin_unlock_irqrestore(&i8259A_lock, flags);
}

-void unmask_8259A(void)
+static void unmask_8259A(void)
{
unsigned long flags;

@@ -305,7 +311,7 @@ void unmask_8259A(void)
spin_unlock_irqrestore(&i8259A_lock, flags);
}

-void init_8259A(int auto_eoi)
+static void init_8259A(int auto_eoi)
{
unsigned long flags;

@@ -358,6 +364,7 @@ void init_8259A(int auto_eoi)

spin_unlock_irqrestore(&i8259A_lock, flags);
}
+
/*
* make i8259 a driver so that we can select pic functions at run time. the goal
* is to make x86 binary compatible among pc compatible and non-pc compatible
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index d593222..89b9510 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -123,7 +123,7 @@ void __init init_ISA_irqs(void)
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
init_bsp_APIC();
#endif
- init_8259A(0);
+ legacy_pic->init(0);

/*
* 16 old-style INTA-cycle interrupts:
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 3e6150d..f7a52f4 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -68,6 +68,7 @@
#include <linux/mc146818rtc.h>

#include <asm/smpboot_hooks.h>
+#include <asm/i8259.h>

#ifdef CONFIG_X86_32
u8 apicid_2_node[MAX_APICID];
@@ -287,9 +288,9 @@ notrace static void __cpuinit start_secondary(void *unused)
check_tsc_sync_target();

if (nmi_watchdog == NMI_IO_APIC) {
- disable_8259A_irq(0);
+ legacy_pic->chip->mask(0);
enable_NMI_through_LVT0();
- enable_8259A_irq(0);
+ legacy_pic->chip->unmask(0);
}

#ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/visws_quirks.c b/arch/x86/kernel/visws_quirks.c
index b48ef6c..f067e95 100644
--- a/arch/x86/kernel/visws_quirks.c
+++ b/arch/x86/kernel/visws_quirks.c
@@ -505,7 +505,7 @@ static struct irq_chip cobalt_irq_type = {
*/
static unsigned int startup_piix4_master_irq(unsigned int irq)
{
- init_8259A(0);
+ legacy_pic->init(0);

return startup_cobalt_irq(irq);
}
@@ -529,9 +529,6 @@ static struct irq_chip piix4_master_irq_type = {

static struct irq_chip piix4_virtual_irq_type = {
.name = "PIIX4-virtual",
- .shutdown = disable_8259A_irq,
- .enable = enable_8259A_irq,
- .disable = disable_8259A_irq,
};


@@ -606,7 +603,7 @@ static irqreturn_t piix4_master_intr(int irq, void *dev_id)
handle_IRQ_event(realirq, desc->action);

if (!(desc->status & IRQ_DISABLED))
- enable_8259A_irq(realirq);
+ legacy_pic->chip->unmask(realirq);

return IRQ_HANDLED;

@@ -625,6 +622,12 @@ static struct irqaction cascade_action = {
.name = "cascade",
};

+static inline void set_piix4_virtual_irq_type(void)
+{
+ piix4_virtual_irq_type.shutdown = i8259A_chip.mask;
+ piix4_virtual_irq_type.enable = i8259A_chip.unmask;
+ piix4_virtual_irq_type.disable = i8259A_chip.mask;
+}

void init_VISWS_APIC_irqs(void)
{
@@ -650,6 +653,7 @@ void init_VISWS_APIC_irqs(void)
desc->chip = &piix4_master_irq_type;
}
else if (i < CO_IRQ_APIC0) {
+ set_piix4_virtual_irq_type();
desc->chip = &piix4_virtual_irq_type;
}
else if (IS_CO_APIC(i)) {
--
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