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yaml
---
r: 116434
b: refs/heads/master
c: 0f978f4
h: refs/heads/master
v: v3
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Yinghai Lu authored and Ingo Molnar committed Oct 16, 2008
1 parent 1ac1df5 commit 399c15b
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Showing 2 changed files with 118 additions and 36 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: da51a821314dd0ec7126f2bf9a62117146fbb6b9
refs/heads/master: 0f978f4505e96227a89b3c9447552aca983c6b57
152 changes: 117 additions & 35 deletions trunk/arch/x86/kernel/io_apic_32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -95,10 +95,11 @@ DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
static int disable_timer_pin_1 __initdata;

struct irq_cfg;

struct irq_pin_list;
struct irq_cfg {
unsigned int irq;
struct irq_cfg *next;
struct irq_pin_list *irq_2_pin;
u8 vector;
};

Expand Down Expand Up @@ -275,11 +276,66 @@ int pin_map_size;
* between pins and IRQs.
*/

static struct irq_pin_list {
int apic, pin, next;
} *irq_2_pin;
struct irq_pin_list {
int apic, pin;
struct irq_pin_list *next;
};

static struct irq_pin_list *irq_2_pin_head;
/* fill one page ? */
static int nr_irq_2_pin = 0x100;
static struct irq_pin_list *irq_2_pin_ptr;
static void __init irq_2_pin_init_work(void *data)
{
struct dyn_array *da = data;
struct irq_pin_list *pin;
int i;

pin = *da->name;

for (i = 1; i < *da->nr; i++)
pin[i-1].next = &pin[i];

irq_2_pin_ptr = &pin[0];
}
DEFINE_DYN_ARRAY(irq_2_pin_head, sizeof(struct irq_pin_list), nr_irq_2_pin, PAGE_SIZE, irq_2_pin_init_work);

static struct irq_pin_list *get_one_free_irq_2_pin(void)
{
struct irq_pin_list *pin;
int i;

pin = irq_2_pin_ptr;

if (pin) {
irq_2_pin_ptr = pin->next;
pin->next = NULL;
return pin;
}

/*
* we run out of pre-allocate ones, allocate more
*/
printk(KERN_DEBUG "try to get more irq_2_pin %d\n", nr_irq_2_pin);

if (after_bootmem)
pin = kzalloc(sizeof(struct irq_pin_list)*nr_irq_2_pin,
GFP_ATOMIC);
else
pin = __alloc_bootmem_nopanic(sizeof(struct irq_pin_list) *
nr_irq_2_pin, PAGE_SIZE, 0);

if (!pin)
panic("can not get more irq_2_pin\n");

DEFINE_DYN_ARRAY(irq_2_pin, sizeof(struct irq_pin_list), pin_map_size, 16, NULL);
for (i = 1; i < nr_irq_2_pin; i++)
pin[i-1].next = &pin[i];

irq_2_pin_ptr = pin->next;
pin->next = NULL;

return pin;
}

struct io_apic {
unsigned int index;
Expand Down Expand Up @@ -383,20 +439,34 @@ static void ioapic_mask_entry(int apic, int pin)
*/
static void add_pin_to_irq(unsigned int irq, int apic, int pin)
{
struct irq_pin_list *entry = irq_2_pin + irq;
struct irq_cfg *cfg;
struct irq_pin_list *entry;

/* first time to refer irq_cfg, so with new */
cfg = irq_cfg_alloc(irq);
entry = cfg->irq_2_pin;
if (!entry) {
entry = get_one_free_irq_2_pin();
cfg->irq_2_pin = entry;
entry->apic = apic;
entry->pin = pin;
printk(KERN_DEBUG " 0 add_pin_to_irq: irq %d --> apic %d pin %d\n", irq, apic, pin);
return;
}

irq_cfg_alloc(irq);
while (entry->next)
entry = irq_2_pin + entry->next;
while (entry->next) {
/* not again, please */
if (entry->apic == apic && entry->pin == pin)
return;

if (entry->pin != -1) {
entry->next = first_free_entry;
entry = irq_2_pin + entry->next;
if (++first_free_entry >= pin_map_size)
panic("io_apic.c: whoops");
entry = entry->next;
}

entry->next = get_one_free_irq_2_pin();
entry = entry->next;
entry->apic = apic;
entry->pin = pin;
printk(KERN_DEBUG " x add_pin_to_irq: irq %d --> apic %d pin %d\n", irq, apic, pin);
}

/*
Expand All @@ -406,35 +476,45 @@ static void __init replace_pin_at_irq(unsigned int irq,
int oldapic, int oldpin,
int newapic, int newpin)
{
struct irq_pin_list *entry = irq_2_pin + irq;
struct irq_cfg *cfg = irq_cfg(irq);
struct irq_pin_list *entry = cfg->irq_2_pin;
int replaced = 0;

while (1) {
while (entry) {
if (entry->apic == oldapic && entry->pin == oldpin) {
entry->apic = newapic;
entry->pin = newpin;
}
if (!entry->next)
replaced = 1;
/* every one is different, right? */
break;
entry = irq_2_pin + entry->next;
}
entry = entry->next;
}

/* why? call replace before add? */
if (!replaced)
add_pin_to_irq(irq, newapic, newpin);
}

static void __modify_IO_APIC_irq(unsigned int irq, unsigned long enable, unsigned long disable)
{
struct irq_pin_list *entry = irq_2_pin + irq;
struct irq_cfg *cfg;
struct irq_pin_list *entry;
unsigned int pin, reg;

cfg = irq_cfg(irq);
entry = cfg->irq_2_pin;
for (;;) {
pin = entry->pin;
if (pin == -1)
if (!entry)
break;
pin = entry->pin;
reg = io_apic_read(entry->apic, 0x10 + pin*2);
reg &= ~disable;
reg |= enable;
io_apic_modify(entry->apic, 0x10 + pin*2, reg);
if (!entry->next)
break;
entry = irq_2_pin + entry->next;
entry = entry->next;
}
}

Expand Down Expand Up @@ -509,13 +589,18 @@ static void clear_IO_APIC(void)
#ifdef CONFIG_SMP
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
{
struct irq_cfg *cfg;
unsigned long flags;
int pin;
struct irq_pin_list *entry = irq_2_pin + irq;
struct irq_pin_list *entry;
unsigned int apicid_value;
cpumask_t tmp;
struct irq_desc *desc;


cfg = irq_cfg(irq);
entry = cfg->irq_2_pin;

cpus_and(tmp, cpumask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
Expand All @@ -527,13 +612,13 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
apicid_value = apicid_value << 24;
spin_lock_irqsave(&ioapic_lock, flags);
for (;;) {
pin = entry->pin;
if (pin == -1)
if (!entry)
break;
pin = entry->pin;
io_apic_write(entry->apic, 0x10 + 1 + pin*2, apicid_value);
if (!entry->next)
break;
entry = irq_2_pin + entry->next;
entry = entry->next;
}
desc = irq_to_desc(irq);
desc->affinity = cpumask;
Expand Down Expand Up @@ -1152,6 +1237,7 @@ __apicdebuginit(void) print_IO_APIC(void)
union IO_APIC_reg_02 reg_02;
union IO_APIC_reg_03 reg_03;
unsigned long flags;
struct irq_cfg *cfg;

if (apic_verbosity == APIC_QUIET)
return;
Expand Down Expand Up @@ -1240,16 +1326,16 @@ __apicdebuginit(void) print_IO_APIC(void)
}
}
printk(KERN_DEBUG "IRQ to pin mappings:\n");
for (i = 0; i < nr_irqs; i++) {
struct irq_pin_list *entry = irq_2_pin + i;
if (entry->pin < 0)
for_each_irq_cfg(cfg) {
struct irq_pin_list *entry = cfg->irq_2_pin;
if (!entry)
continue;
printk(KERN_DEBUG "IRQ%d ", i);
for (;;) {
printk("-> %d:%d", entry->apic, entry->pin);
if (!entry->next)
break;
entry = irq_2_pin + entry->next;
entry = entry->next;
}
printk("\n");
}
Expand Down Expand Up @@ -1420,10 +1506,6 @@ static void __init enable_IO_APIC(void)
int i, apic;
unsigned long flags;

for (i = 0; i < pin_map_size; i++) {
irq_2_pin[i].pin = -1;
irq_2_pin[i].next = 0;
}
if (!pirqs_enabled)
for (i = 0; i < MAX_PIRQS; i++)
pirq_entries[i] = -1;
Expand Down

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