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x86, ioapic: Introduce helper utilities to walk ioapics and pins

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Introduce helper utilities for_each_ioapic(), for_each_ioapic_reverse(),
for_each_pin() and for_each_ioapic_pin() to walk ioapics and pins.
They will be rewritten e will rewrite later to support IOAPIC hotplug.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1402302011-23642-14-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu 2014-06-09 16:19:42 +08:00 committed by Thomas Gleixner
parent 518b2c63fc
commit f44d169296
1 changed files with 62 additions and 58 deletions
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98
arch/x86/kernel/apic/io_apic.c
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@ -62,6 +62,16 @@
#define __apicdebuginit(type) static type __init #define __apicdebuginit(type) static type __init
#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) \ #define for_each_irq_pin(entry, head) \
for (entry = head; entry; entry = entry->next) for (entry = head; entry; entry = entry->next)
@ -191,7 +201,7 @@ int __init arch_early_irq_init(void)
if (!legacy_pic->nr_legacy_irqs) if (!legacy_pic->nr_legacy_irqs)
io_apic_irqs = ~0UL; io_apic_irqs = ~0UL;
for (i = 0; i < nr_ioapics; i++) { for_each_ioapic(i) {
ioapics[i].saved_registers = ioapics[i].saved_registers =
kzalloc(sizeof(struct IO_APIC_route_entry) * kzalloc(sizeof(struct IO_APIC_route_entry) *
ioapics[i].nr_registers, GFP_KERNEL); ioapics[i].nr_registers, GFP_KERNEL);
@ -624,8 +634,7 @@ static void clear_IO_APIC (void)
{ {
int apic, pin; int apic, pin;
for (apic = 0; apic < nr_ioapics; apic++) for_each_ioapic_pin(apic, pin)
for (pin = 0; pin < ioapics[apic].nr_registers; pin++)
clear_IO_APIC_pin(apic, pin); clear_IO_APIC_pin(apic, pin);
} }
@ -675,13 +684,13 @@ int save_ioapic_entries(void)
int apic, pin; int apic, pin;
int err = 0; int err = 0;
for (apic = 0; apic < nr_ioapics; apic++) { for_each_ioapic(apic) {
if (!ioapics[apic].saved_registers) { if (!ioapics[apic].saved_registers) {
err = -ENOMEM; err = -ENOMEM;
continue; continue;
} }
for (pin = 0; pin < ioapics[apic].nr_registers; pin++) for_each_pin(apic, pin)
ioapics[apic].saved_registers[pin] = ioapics[apic].saved_registers[pin] =
ioapic_read_entry(apic, pin); ioapic_read_entry(apic, pin);
} }
@ -696,11 +705,11 @@ void mask_ioapic_entries(void)
{ {
int apic, pin; int apic, pin;
for (apic = 0; apic < nr_ioapics; apic++) { for_each_ioapic(apic) {
if (!ioapics[apic].saved_registers) if (!ioapics[apic].saved_registers)
continue; continue;
for (pin = 0; pin < ioapics[apic].nr_registers; pin++) { for_each_pin(apic, pin) {
struct IO_APIC_route_entry entry; struct IO_APIC_route_entry entry;
entry = ioapics[apic].saved_registers[pin]; entry = ioapics[apic].saved_registers[pin];
@ -719,11 +728,11 @@ int restore_ioapic_entries(void)
{ {
int apic, pin; int apic, pin;
for (apic = 0; apic < nr_ioapics; apic++) { for_each_ioapic(apic) {
if (!ioapics[apic].saved_registers) if (!ioapics[apic].saved_registers)
continue; continue;
for (pin = 0; pin < ioapics[apic].nr_registers; pin++) for_each_pin(apic, pin)
ioapic_write_entry(apic, pin, ioapic_write_entry(apic, pin,
ioapics[apic].saved_registers[pin]); ioapics[apic].saved_registers[pin]);
} }
@ -782,7 +791,7 @@ static int __init find_isa_irq_apic(int irq, int type)
if (i < mp_irq_entries) { if (i < mp_irq_entries) {
int ioapic_idx; int ioapic_idx;
for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) for_each_ioapic(ioapic_idx)
if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic) if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
return ioapic_idx; return ioapic_idx;
} }
@ -1001,7 +1010,7 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin,
for (i = 0; i < mp_irq_entries; i++) { for (i = 0; i < mp_irq_entries; i++) {
int lbus = mp_irqs[i].srcbus; int lbus = mp_irqs[i].srcbus;
for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) for_each_ioapic(ioapic_idx)
if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic || if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
mp_irqs[i].dstapic == MP_APIC_ALL) mp_irqs[i].dstapic == MP_APIC_ALL)
break; break;
@ -1224,13 +1233,11 @@ static inline int IO_APIC_irq_trigger(int irq)
{ {
int apic, idx, pin; int apic, idx, pin;
for (apic = 0; apic < nr_ioapics; apic++) { for_each_ioapic_pin(apic, pin) {
for (pin = 0; pin < ioapics[apic].nr_registers; pin++) {
idx = find_irq_entry(apic, pin, mp_INT); idx = find_irq_entry(apic, pin, mp_INT);
if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin))) if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin)))
return irq_trigger(idx); return irq_trigger(idx);
} }
}
/* /*
* nonexistent IRQs are edge default * nonexistent IRQs are edge default
*/ */
@ -1349,7 +1356,7 @@ static void __init __io_apic_setup_irqs(unsigned int ioapic_idx)
struct io_apic_irq_attr attr; struct io_apic_irq_attr attr;
unsigned int pin, irq; unsigned int pin, irq;
for (pin = 0; pin < ioapics[ioapic_idx].nr_registers; pin++) { for_each_pin(ioapic_idx, pin) {
idx = find_irq_entry(ioapic_idx, pin, mp_INT); idx = find_irq_entry(ioapic_idx, pin, mp_INT);
if (io_apic_pin_not_connected(idx, ioapic_idx, pin)) if (io_apic_pin_not_connected(idx, ioapic_idx, pin))
continue; continue;
@ -1380,7 +1387,7 @@ static void __init setup_IO_APIC_irqs(void)
apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n"); apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) for_each_ioapic(ioapic_idx)
__io_apic_setup_irqs(ioapic_idx); __io_apic_setup_irqs(ioapic_idx);
} }
@ -1583,7 +1590,7 @@ __apicdebuginit(void) print_IO_APICs(void)
struct irq_chip *chip; struct irq_chip *chip;
printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries); printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) for_each_ioapic(ioapic_idx)
printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n", printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
mpc_ioapic_id(ioapic_idx), mpc_ioapic_id(ioapic_idx),
ioapics[ioapic_idx].nr_registers); ioapics[ioapic_idx].nr_registers);
@ -1594,7 +1601,7 @@ __apicdebuginit(void) print_IO_APICs(void)
*/ */
printk(KERN_INFO "testing the IO APIC.......................\n"); printk(KERN_INFO "testing the IO APIC.......................\n");
for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) for_each_ioapic(ioapic_idx)
print_IO_APIC(ioapic_idx); print_IO_APIC(ioapic_idx);
printk(KERN_DEBUG "IRQ to pin mappings:\n"); printk(KERN_DEBUG "IRQ to pin mappings:\n");
@ -1825,17 +1832,14 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
void __init enable_IO_APIC(void) void __init enable_IO_APIC(void)
{ {
int i8259_apic, i8259_pin; int i8259_apic, i8259_pin;
int apic; int apic, pin;
if (!legacy_pic->nr_legacy_irqs) if (!legacy_pic->nr_legacy_irqs)
return; return;
for(apic = 0; apic < nr_ioapics; apic++) { for_each_ioapic_pin(apic, pin) {
int pin;
/* See if any of the pins is in ExtINT mode */ /* See if any of the pins is in ExtINT mode */
for (pin = 0; pin < ioapics[apic].nr_registers; pin++) { struct IO_APIC_route_entry entry = ioapic_read_entry(apic, pin);
struct IO_APIC_route_entry entry;
entry = ioapic_read_entry(apic, pin);
/* If the interrupt line is enabled and in ExtInt mode /* If the interrupt line is enabled and in ExtInt mode
* I have found the pin where the i8259 is connected. * I have found the pin where the i8259 is connected.
@ -1846,7 +1850,6 @@ void __init enable_IO_APIC(void)
goto found_i8259; goto found_i8259;
} }
} }
}
found_i8259: found_i8259:
/* Look to see what if the MP table has reported the ExtINT */ /* 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 /* If we could not find the appropriate pin by looking at the ioapic
@ -1947,7 +1950,7 @@ void __init setup_ioapic_ids_from_mpc_nocheck(void)
/* /*
* Set the IOAPIC ID to the value stored in the MPC table. * Set the IOAPIC ID to the value stored in the MPC table.
*/ */
for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) { for_each_ioapic(ioapic_idx) {
/* Read the register 0 value */ /* Read the register 0 value */
raw_spin_lock_irqsave(&ioapic_lock, flags); raw_spin_lock_irqsave(&ioapic_lock, flags);
reg_00.raw = io_apic_read(ioapic_idx, 0); reg_00.raw = io_apic_read(ioapic_idx, 0);
@ -2863,7 +2866,7 @@ static void ioapic_resume(void)
{ {
int ioapic_idx; int ioapic_idx;
for (ioapic_idx = nr_ioapics - 1; ioapic_idx >= 0; ioapic_idx--) for_each_ioapic_reverse(ioapic_idx)
resume_ioapic_id(ioapic_idx); resume_ioapic_id(ioapic_idx);
restore_ioapic_entries(); restore_ioapic_entries();
@ -3457,9 +3460,8 @@ static u8 __init io_apic_unique_id(u8 id)
DECLARE_BITMAP(used, 256); DECLARE_BITMAP(used, 256);
bitmap_zero(used, 256); bitmap_zero(used, 256);
for (i = 0; i < nr_ioapics; i++) { for_each_ioapic(i)
__set_bit(mpc_ioapic_id(i), used); __set_bit(mpc_ioapic_id(i), used);
}
if (!test_bit(id, used)) if (!test_bit(id, used))
return id; return id;
return find_first_zero_bit(used, 256); return find_first_zero_bit(used, 256);
@ -3517,8 +3519,7 @@ void __init setup_ioapic_dest(void)
if (skip_ioapic_setup == 1) if (skip_ioapic_setup == 1)
return; return;
for (ioapic = 0; ioapic < nr_ioapics; ioapic++) for_each_ioapic_pin(ioapic, pin) {
for (pin = 0; pin < ioapics[ioapic].nr_registers; pin++) {
irq_entry = find_irq_entry(ioapic, pin, mp_INT); irq_entry = find_irq_entry(ioapic, pin, mp_INT);
if (irq_entry == -1) if (irq_entry == -1)
continue; continue;
@ -3547,29 +3548,33 @@ void __init setup_ioapic_dest(void)
static struct resource *ioapic_resources; static struct resource *ioapic_resources;
static struct resource * __init ioapic_setup_resources(int nr_ioapics) static struct resource * __init ioapic_setup_resources(void)
{ {
unsigned long n; unsigned long n;
struct resource *res; struct resource *res;
char *mem; char *mem;
int i; int i, num = 0;
if (nr_ioapics <= 0) for_each_ioapic(i)
num++;
if (num == 0)
return NULL; return NULL;
n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource); n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
n *= nr_ioapics; n *= num;
mem = alloc_bootmem(n); mem = alloc_bootmem(n);
res = (void *)mem; res = (void *)mem;
mem += sizeof(struct resource) * nr_ioapics; mem += sizeof(struct resource) * num;
for (i = 0; i < nr_ioapics; i++) { num = 0;
res[i].name = mem; for_each_ioapic(i) {
res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY; res[num].name = mem;
res[num].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i); snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
mem += IOAPIC_RESOURCE_NAME_SIZE; mem += IOAPIC_RESOURCE_NAME_SIZE;
num++;
} }
ioapic_resources = res; ioapic_resources = res;
@ -3583,8 +3588,8 @@ void __init native_io_apic_init_mappings(void)
struct resource *ioapic_res; struct resource *ioapic_res;
int i; int i;
ioapic_res = ioapic_setup_resources(nr_ioapics); ioapic_res = ioapic_setup_resources();
for (i = 0; i < nr_ioapics; i++) { for_each_ioapic(i) {
if (smp_found_config) { if (smp_found_config) {
ioapic_phys = mpc_ioapic_addr(i); ioapic_phys = mpc_ioapic_addr(i);
#ifdef CONFIG_X86_32 #ifdef CONFIG_X86_32
@ -3629,7 +3634,7 @@ void __init ioapic_insert_resources(void)
return; return;
} }
for (i = 0; i < nr_ioapics; i++) { for_each_ioapic(i) {
insert_resource(&iomem_resource, r); insert_resource(&iomem_resource, r);
r++; r++;
} }
@ -3637,16 +3642,15 @@ void __init ioapic_insert_resources(void)
int mp_find_ioapic(u32 gsi) int mp_find_ioapic(u32 gsi)
{ {
int i = 0; int i;
if (nr_ioapics == 0) if (nr_ioapics == 0)
return -1; return -1;
/* Find the IOAPIC that manages this GSI. */ /* Find the IOAPIC that manages this GSI. */
for (i = 0; i < nr_ioapics; i++) { for_each_ioapic(i) {
struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i); struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i);
if ((gsi >= gsi_cfg->gsi_base) if (gsi >= gsi_cfg->gsi_base && gsi <= gsi_cfg->gsi_end)
&& (gsi <= gsi_cfg->gsi_end))
return i; return i;
} }
@ -3658,7 +3662,7 @@ int mp_find_ioapic_pin(int ioapic, u32 gsi)
{ {
struct mp_ioapic_gsi *gsi_cfg; struct mp_ioapic_gsi *gsi_cfg;
if (WARN_ON(ioapic == -1)) if (WARN_ON(ioapic < 0))
return -1; return -1;
gsi_cfg = mp_ioapic_gsi_routing(ioapic); gsi_cfg = mp_ioapic_gsi_routing(ioapic);