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[PATCH] Factor out common io apic routing entry access
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The IO APIC code had lots of duplicated code to read/write 64bit
routing entries into the IO-APIC. Factor this out int common read/write
functions

In a few cases the IO APIC lock is taken more often now, but this
isn't a problem because it's all initialization/shutdown only
slow path code.

Signed-off-by: Andi Kleen <ak@suse.de>
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Andi Kleen authored and Andi Kleen committed Sep 26, 2006
1 parent c1a58b4 commit eea0e11
Showing 1 changed file with 41 additions and 41 deletions.
82 changes: 41 additions & 41 deletions arch/x86_64/kernel/io_apic.c
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,33 @@ int vector_irq[NR_VECTORS] __read_mostly = { [0 ... NR_VECTORS - 1] = -1};
FINAL; \
}

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;
unsigned long flags;
spin_lock_irqsave(&ioapic_lock, flags);
eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
spin_unlock_irqrestore(&ioapic_lock, flags);
return eu.entry;
}

static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
{
unsigned long flags;
union entry_union eu;
eu.entry = e;
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0x10 + 2*pin, eu.w1);
io_apic_write(apic, 0x11 + 2*pin, eu.w2);
spin_unlock_irqrestore(&ioapic_lock, flags);
}

#ifdef CONFIG_SMP
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
{
Expand Down Expand Up @@ -196,24 +223,17 @@ static void unmask_IO_APIC_irq (unsigned int irq)
static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
{
struct IO_APIC_route_entry entry;
unsigned long flags;

/* Check delivery_mode to be sure we're not clearing an SMI pin */
spin_lock_irqsave(&ioapic_lock, flags);
*(((int*)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
*(((int*)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
spin_unlock_irqrestore(&ioapic_lock, flags);
entry = ioapic_read_entry(apic, pin);
if (entry.delivery_mode == dest_SMI)
return;
/*
* Disable it in the IO-APIC irq-routing table:
*/
memset(&entry, 0, sizeof(entry));
entry.mask = 1;
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0x10 + 2 * pin, *(((int *)&entry) + 0));
io_apic_write(apic, 0x11 + 2 * pin, *(((int *)&entry) + 1));
spin_unlock_irqrestore(&ioapic_lock, flags);
ioapic_write_entry(apic, pin, entry);
}

static void clear_IO_APIC (void)
Expand Down Expand Up @@ -838,9 +858,9 @@ static void __init setup_IO_APIC_irqs(void)
if (!apic && (irq < 16))
disable_8259A_irq(irq);
}
ioapic_write_entry(apic, pin, entry);

spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(apic, 0x11+2*pin, *(((int *)&entry)+1));
io_apic_write(apic, 0x10+2*pin, *(((int *)&entry)+0));
set_native_irq_info(irq, TARGET_CPUS);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
Expand Down Expand Up @@ -978,10 +998,7 @@ void __apicdebuginit print_IO_APIC(void)
for (i = 0; i <= reg_01.bits.entries; i++) {
struct IO_APIC_route_entry entry;

spin_lock_irqsave(&ioapic_lock, flags);
*(((int *)&entry)+0) = io_apic_read(apic, 0x10+i*2);
*(((int *)&entry)+1) = io_apic_read(apic, 0x11+i*2);
spin_unlock_irqrestore(&ioapic_lock, flags);
entry = ioapic_read_entry(apic, i);

printk(KERN_DEBUG " %02x %03X %02X ",
i,
Expand Down Expand Up @@ -1191,11 +1208,7 @@ static void __init enable_IO_APIC(void)
/* See if any of the pins is in ExtINT mode */
for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
struct IO_APIC_route_entry entry;
spin_lock_irqsave(&ioapic_lock, flags);
*(((int *)&entry) + 0) = io_apic_read(apic, 0x10 + 2 * pin);
*(((int *)&entry) + 1) = io_apic_read(apic, 0x11 + 2 * pin);
spin_unlock_irqrestore(&ioapic_lock, flags);

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.
Expand Down Expand Up @@ -1247,7 +1260,6 @@ void disable_IO_APIC(void)
*/
if (ioapic_i8259.pin != -1) {
struct IO_APIC_route_entry entry;
unsigned long flags;

memset(&entry, 0, sizeof(entry));
entry.mask = 0; /* Enabled */
Expand All @@ -1264,12 +1276,7 @@ void disable_IO_APIC(void)
/*
* Add it to the IO-APIC irq-routing table:
*/
spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(ioapic_i8259.apic, 0x11+2*ioapic_i8259.pin,
*(((int *)&entry)+1));
io_apic_write(ioapic_i8259.apic, 0x10+2*ioapic_i8259.pin,
*(((int *)&entry)+0));
spin_unlock_irqrestore(&ioapic_lock, flags);
ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
}

disconnect_bsp_APIC(ioapic_i8259.pin != -1);
Expand Down Expand Up @@ -1879,17 +1886,12 @@ static int ioapic_suspend(struct sys_device *dev, pm_message_t state)
{
struct IO_APIC_route_entry *entry;
struct sysfs_ioapic_data *data;
unsigned long flags;
int i;

data = container_of(dev, struct sysfs_ioapic_data, dev);
entry = data->entry;
spin_lock_irqsave(&ioapic_lock, flags);
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
*(((int *)entry) + 1) = io_apic_read(dev->id, 0x11 + 2 * i);
*(((int *)entry) + 0) = io_apic_read(dev->id, 0x10 + 2 * i);
}
spin_unlock_irqrestore(&ioapic_lock, flags);
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ )
*entry = ioapic_read_entry(dev->id, i);

return 0;
}
Expand All @@ -1911,11 +1913,9 @@ static int ioapic_resume(struct sys_device *dev)
reg_00.bits.ID = mp_ioapics[dev->id].mpc_apicid;
io_apic_write(dev->id, 0, reg_00.raw);
}
for (i = 0; i < nr_ioapic_registers[dev->id]; i ++, entry ++ ) {
io_apic_write(dev->id, 0x11+2*i, *(((int *)entry)+1));
io_apic_write(dev->id, 0x10+2*i, *(((int *)entry)+0));
}
spin_unlock_irqrestore(&ioapic_lock, flags);
for (i = 0; i < nr_ioapic_registers[dev->id]; i++)
ioapic_write_entry(dev->id, i, entry[i]);

return 0;
}
Expand Down Expand Up @@ -2040,10 +2040,10 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int p
if (!ioapic && (irq < 16))
disable_8259A_irq(irq);

ioapic_write_entry(ioapic, pin, entry);

spin_lock_irqsave(&ioapic_lock, flags);
io_apic_write(ioapic, 0x11+2*pin, *(((int *)&entry)+1));
io_apic_write(ioapic, 0x10+2*pin, *(((int *)&entry)+0));
set_native_irq_info(use_pci_vector() ? entry.vector : irq, TARGET_CPUS);
set_native_irq_info(use_pci_vector() ? entry.vector : irq, TARGET_CPUS);
spin_unlock_irqrestore(&ioapic_lock, flags);

return 0;
Expand Down

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