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[PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinity 

When handling writes to /proc/irq, current code is re-programming rte
entries directly. This is not recommended and could potentially cause
chipset's to lockup, or cause missing interrupts.

CONFIG_IRQ_BALANCE does this correctly, where it re-programs only when the
interrupt is pending. The same needs to be done for /proc/irq handling as well.
Otherwise user space irq balancers are really not doing the right thing.

- Changed pending_irq_balance_cpumask to pending_irq_migrate_cpumask for
  lack of a generic name.
- added move_irq out of IRQ_BALANCE, and added this same to X86_64
- Added new proc handler for write, so we can do deferred write at irq
  handling time.
- Display of /proc/irq/XX/smp_affinity used to display CPU_MASKALL, instead
  it now shows only active cpu masks, or exactly what was set.
- Provided a common move_irq implementation, instead of duplicating
  when using generic irq framework.

Tested on i386/x86_64 and ia64 with CONFIG_PCI_MSI turned on and off.
Tested UP builds as well.

MSI testing: tbd: I have cards, need to look for a x-over cable, although I
did test an earlier version of this patch.  Will test in a couple days.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Acked-by: Zwane Mwaikambo <zwane@holomorphy.com>
Grudgingly-acked-by: Andi Kleen <ak@muc.de>
Signed-off-by: Coywolf Qi Hunt <coywolf@lovecn.org>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ashok Raj 2005-09-06 15:16:15 -07:00 committed by Linus Torvalds
parent f63ed39c57
commit 54d5d42404
13 changed files with 253 additions and 134 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/i386/Kconfig
View File

@ -1318,6 +1318,11 @@ config GENERIC_IRQ_PROBE
bool
default y
config GENERIC_PENDING_IRQ
bool
depends on GENERIC_HARDIRQS && SMP
default y
config X86_SMP
bool
depends on SMP && !X86_VOYAGER

55
arch/i386/kernel/io_apic.c
View File

@ -33,6 +33,7 @@
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/sysdev.h>
#include <asm/io.h>
#include <asm/smp.h>
#include <asm/desc.h>
@ -222,13 +223,21 @@ static void clear_IO_APIC (void)
clear_IO_APIC_pin(apic, pin);
}
#ifdef CONFIG_SMP
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
{
unsigned long flags;
int pin;
struct irq_pin_list *entry = irq_2_pin + irq;
unsigned int apicid_value;
cpumask_t tmp;
cpus_and(tmp, cpumask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
cpus_and(cpumask, tmp, CPU_MASK_ALL);
apicid_value = cpu_mask_to_apicid(cpumask);
/* Prepare to do the io_apic_write */
apicid_value = apicid_value << 24;
@ -242,6 +251,7 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
break;
entry = irq_2_pin + entry->next;
}
set_irq_info(irq, cpumask);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
@ -259,7 +269,6 @@ static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t cpumask)
# define Dprintk(x...)
# endif
cpumask_t __cacheline_aligned pending_irq_balance_cpumask[NR_IRQS];
#define IRQBALANCE_CHECK_ARCH -999
static int irqbalance_disabled = IRQBALANCE_CHECK_ARCH;
@ -328,12 +337,7 @@ static inline void balance_irq(int cpu, int irq)
cpus_and(allowed_mask, cpu_online_map, irq_affinity[irq]);
new_cpu = move(cpu, allowed_mask, now, 1);
if (cpu != new_cpu) {
irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
pending_irq_balance_cpumask[irq] = cpumask_of_cpu(new_cpu);
spin_unlock_irqrestore(&desc->lock, flags);
set_pending_irq(irq, cpumask_of_cpu(new_cpu));
}
}
@ -528,16 +532,12 @@ tryanotherirq:
cpus_and(tmp, target_cpu_mask, allowed_mask);
if (!cpus_empty(tmp)) {
irq_desc_t *desc = irq_desc + selected_irq;
unsigned long flags;
Dprintk("irq = %d moved to cpu = %d\n",
selected_irq, min_loaded);
/* mark for change destination */
spin_lock_irqsave(&desc->lock, flags);
pending_irq_balance_cpumask[selected_irq] =
cpumask_of_cpu(min_loaded);
spin_unlock_irqrestore(&desc->lock, flags);
set_pending_irq(selected_irq, cpumask_of_cpu(min_loaded));
/* Since we made a change, come back sooner to
* check for more variation.
*/
@ -568,7 +568,8 @@ static int balanced_irq(void *unused)
/* push everything to CPU 0 to give us a starting point. */
for (i = 0 ; i < NR_IRQS ; i++) {
pending_irq_balance_cpumask[i] = cpumask_of_cpu(0);
pending_irq_cpumask[i] = cpumask_of_cpu(0);
set_pending_irq(i, cpumask_of_cpu(0));
}
for ( ; ; ) {
@ -647,20 +648,9 @@ int __init irqbalance_disable(char *str)
__setup("noirqbalance", irqbalance_disable);
static inline void move_irq(int irq)
{
/* note - we hold the desc->lock */
if (unlikely(!cpus_empty(pending_irq_balance_cpumask[irq]))) {
set_ioapic_affinity_irq(irq, pending_irq_balance_cpumask[irq]);
cpus_clear(pending_irq_balance_cpumask[irq]);
}
}
late_initcall(balanced_irq_init);
#else /* !CONFIG_IRQBALANCE */
static inline void move_irq(int irq) { }
#endif /* CONFIG_IRQBALANCE */
#endif /* CONFIG_SMP */
#ifndef CONFIG_SMP
void fastcall send_IPI_self(int vector)
@ -820,6 +810,7 @@ EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
* we need to reprogram the ioredtbls to cater for the cpus which have come online
* so mask in all cases should simply be TARGET_CPUS
*/
#ifdef CONFIG_SMP
void __init setup_ioapic_dest(void)
{
int pin, ioapic, irq, irq_entry;
@ -838,6 +829,7 @@ void __init setup_ioapic_dest(void)
}
}
#endif
/*
* EISA Edge/Level control register, ELCR
@ -1249,6 +1241,7 @@ static void __init setup_IO_APIC_irqs(void)
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);
}
}
@ -1944,6 +1937,7 @@ static void ack_edge_ioapic_vector(unsigned int vector)
{
int irq = vector_to_irq(vector);
move_irq(vector);
ack_edge_ioapic_irq(irq);
}
@ -1958,6 +1952,7 @@ static void end_level_ioapic_vector (unsigned int vector)
{
int irq = vector_to_irq(vector);
move_irq(vector);
end_level_ioapic_irq(irq);
}
@ -1975,14 +1970,17 @@ static void unmask_IO_APIC_vector (unsigned int vector)
unmask_IO_APIC_irq(irq);
}
#ifdef CONFIG_SMP
static void set_ioapic_affinity_vector (unsigned int vector,
cpumask_t cpu_mask)
{
int irq = vector_to_irq(vector);
set_native_irq_info(vector, cpu_mask);
set_ioapic_affinity_irq(irq, cpu_mask);
}
#endif
#endif
/*
* Level and edge triggered IO-APIC interrupts need different handling,
@ -2000,7 +1998,9 @@ static struct hw_interrupt_type ioapic_edge_type = {
.disable = disable_edge_ioapic,
.ack = ack_edge_ioapic,
.end = end_edge_ioapic,
#ifdef CONFIG_SMP
.set_affinity = set_ioapic_affinity,
#endif
};
static struct hw_interrupt_type ioapic_level_type = {
@ -2011,7 +2011,9 @@ static struct hw_interrupt_type ioapic_level_type = {
.disable = disable_level_ioapic,
.ack = mask_and_ack_level_ioapic,
.end = end_level_ioapic,
#ifdef CONFIG_SMP
.set_affinity = set_ioapic_affinity,
#endif
};
static inline void init_IO_APIC_traps(void)
@ -2569,6 +2571,7 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
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);
spin_unlock_irqrestore(&ioapic_lock, flags);
return 0;

5
arch/ia64/Kconfig
View File

@ -434,6 +434,11 @@ config GENERIC_IRQ_PROBE
bool
default y
config GENERIC_PENDING_IRQ
bool
depends on GENERIC_HARDIRQS && SMP
default y
source "arch/ia64/hp/sim/Kconfig"
source "arch/ia64/oprofile/Kconfig"

39
arch/ia64/kernel/irq.c
View File

@ -91,23 +91,8 @@ skip:
}
#ifdef CONFIG_SMP
/*
* This is updated when the user sets irq affinity via /proc
*/
static cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
static unsigned long pending_irq_redir[BITS_TO_LONGS(NR_IRQS)];
static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 };
/*
* Arch specific routine for deferred write to iosapic rte to reprogram
* intr destination.
*/
void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
{
pending_irq_cpumask[irq] = mask_val;
}
void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
{
cpumask_t mask = CPU_MASK_NONE;
@ -116,32 +101,10 @@ void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
if (irq < NR_IRQS) {
irq_affinity[irq] = mask;
set_irq_info(irq, mask);
irq_redir[irq] = (char) (redir & 0xff);
}
}
void move_irq(int irq)
{
/* note - we hold desc->lock */
cpumask_t tmp;
irq_desc_t *desc = irq_descp(irq);
int redir = test_bit(irq, pending_irq_redir);
if (unlikely(!desc->handler->set_affinity))
return;
if (!cpus_empty(pending_irq_cpumask[irq])) {
cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
if (unlikely(!cpus_empty(tmp))) {
desc->handler->set_affinity(irq | (redir ? IA64_IRQ_REDIRECTED : 0),
pending_irq_cpumask[irq]);
}
cpus_clear(pending_irq_cpumask[irq]);
}
}
#endif /* CONFIG_SMP */
#ifdef CONFIG_HOTPLUG_CPU

5
arch/x86_64/Kconfig
View File

@ -441,6 +441,11 @@ config ISA_DMA_API
bool
default y
config GENERIC_PENDING_IRQ
bool
depends on GENERIC_HARDIRQS && SMP
default y
menu "Power management options"
source kernel/power/Kconfig

102
arch/x86_64/kernel/io_apic.c
View File

@ -78,6 +78,54 @@ int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
#define vector_to_irq(vector) (vector)
#endif
#define __DO_ACTION(R, ACTION, FINAL) \
\
{ \
int pin; \
struct irq_pin_list *entry = irq_2_pin + irq; \
\
for (;;) { \
unsigned int reg; \
pin = entry->pin; \
if (pin == -1) \
break; \
reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
reg ACTION; \
io_apic_modify(entry->apic, reg); \
if (!entry->next) \
break; \
entry = irq_2_pin + entry->next; \
} \
FINAL; \
}
#ifdef CONFIG_SMP
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
{
unsigned long flags;
unsigned int dest;
cpumask_t tmp;
cpus_and(tmp, mask, cpu_online_map);
if (cpus_empty(tmp))
tmp = TARGET_CPUS;
cpus_and(mask, tmp, CPU_MASK_ALL);
dest = cpu_mask_to_apicid(mask);
/*
* Only the high 8 bits are valid.
*/
dest = SET_APIC_LOGICAL_ID(dest);
spin_lock_irqsave(&ioapic_lock, flags);
__DO_ACTION(1, = dest, )
set_irq_info(irq, mask);
spin_unlock_irqrestore(&ioapic_lock, flags);
}
#endif
/*
* 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
@ -101,26 +149,6 @@ static void add_pin_to_irq(unsigned int irq, int apic, int pin)
entry->pin = pin;
}
#define __DO_ACTION(R, ACTION, FINAL) \
\
{ \
int pin; \
struct irq_pin_list *entry = irq_2_pin + irq; \
\
for (;;) { \
unsigned int reg; \
pin = entry->pin; \
if (pin == -1) \
break; \
reg = io_apic_read(entry->apic, 0x10 + R + pin*2); \
reg ACTION; \
io_apic_modify(entry->apic, reg); \
if (!entry->next) \
break; \
entry = irq_2_pin + entry->next; \
} \
FINAL; \
}
#define DO_ACTION(name,R,ACTION, FINAL) \
\
@ -767,6 +795,7 @@ static void __init setup_IO_APIC_irqs(void)
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);
}
}
@ -1314,6 +1343,7 @@ static unsigned int startup_edge_ioapic_irq(unsigned int irq)
*/
static void ack_edge_ioapic_irq(unsigned int irq)
{
move_irq(irq);
if ((irq_desc[irq].status & (IRQ_PENDING | IRQ_DISABLED))
== (IRQ_PENDING | IRQ_DISABLED))
mask_IO_APIC_irq(irq);
@ -1343,26 +1373,10 @@ static unsigned int startup_level_ioapic_irq (unsigned int irq)
static void end_level_ioapic_irq (unsigned int irq)
{
move_irq(irq);
ack_APIC_irq();
}
static void set_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
{
unsigned long flags;
unsigned int dest;
dest = cpu_mask_to_apicid(mask);
/*
* Only the high 8 bits are valid.
*/
dest = SET_APIC_LOGICAL_ID(dest);
spin_lock_irqsave(&ioapic_lock, flags);
__DO_ACTION(1, = dest, )
spin_unlock_irqrestore(&ioapic_lock, flags);
}
#ifdef CONFIG_PCI_MSI
static unsigned int startup_edge_ioapic_vector(unsigned int vector)
{
@ -1375,6 +1389,7 @@ static void ack_edge_ioapic_vector(unsigned int vector)
{
int irq = vector_to_irq(vector);
move_native_irq(vector);
ack_edge_ioapic_irq(irq);
}
@ -1389,6 +1404,7 @@ static void end_level_ioapic_vector (unsigned int vector)
{
int irq = vector_to_irq(vector);
move_native_irq(vector);
end_level_ioapic_irq(irq);
}
@ -1406,14 +1422,17 @@ static void unmask_IO_APIC_vector (unsigned int vector)
unmask_IO_APIC_irq(irq);
}
#ifdef CONFIG_SMP
static void set_ioapic_affinity_vector (unsigned int vector,
cpumask_t cpu_mask)
{
int irq = vector_to_irq(vector);
set_native_irq_info(vector, cpu_mask);
set_ioapic_affinity_irq(irq, cpu_mask);
}
#endif
#endif // CONFIG_SMP
#endif // CONFIG_PCI_MSI
/*
* Level and edge triggered IO-APIC interrupts need different handling,
@ -1432,7 +1451,9 @@ static struct hw_interrupt_type ioapic_edge_type = {
.disable = disable_edge_ioapic,
.ack = ack_edge_ioapic,
.end = end_edge_ioapic,
#ifdef CONFIG_SMP
.set_affinity = set_ioapic_affinity,
#endif
};
static struct hw_interrupt_type ioapic_level_type = {
@ -1443,7 +1464,9 @@ static struct hw_interrupt_type ioapic_level_type = {
.disable = disable_level_ioapic,
.ack = mask_and_ack_level_ioapic,
.end = end_level_ioapic,
#ifdef CONFIG_SMP
.set_affinity = set_ioapic_affinity,
#endif
};
static inline void init_IO_APIC_traps(void)
@ -1918,6 +1941,7 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
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);
spin_unlock_irqrestore(&ioapic_lock, flags);
return 0;
@ -1931,6 +1955,7 @@ int io_apic_set_pci_routing (int ioapic, int pin, int irq, int edge_level, int a
* we need to reprogram the ioredtbls to cater for the cpus which have come online
* so mask in all cases should simply be TARGET_CPUS
*/
#ifdef CONFIG_SMP
void __init setup_ioapic_dest(void)
{
int pin, ioapic, irq, irq_entry;
@ -1949,3 +1974,4 @@ void __init setup_ioapic_dest(void)
}
}
#endif

17
drivers/pci/msi.c
View File

@ -91,6 +91,7 @@ static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask)
{
struct msi_desc *entry;
struct msg_address address;
unsigned int irq = vector;
entry = (struct msi_desc *)msi_desc[vector];
if (!entry || !entry->dev)
@ -112,6 +113,7 @@ static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask)
entry->msi_attrib.current_cpu = cpu_mask_to_apicid(cpu_mask);
pci_write_config_dword(entry->dev, msi_lower_address_reg(pos),
address.lo_address.value);
set_native_irq_info(irq, cpu_mask);
break;
}
case PCI_CAP_ID_MSIX:
@ -125,22 +127,13 @@ static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask)
MSI_TARGET_CPU_SHIFT);
entry->msi_attrib.current_cpu = cpu_mask_to_apicid(cpu_mask);
writel(address.lo_address.value, entry->mask_base + offset);
set_native_irq_info(irq, cpu_mask);
break;
}
default:
break;
}
}
#ifdef CONFIG_IRQBALANCE
static inline void move_msi(int vector)
{
if (!cpus_empty(pending_irq_balance_cpumask[vector])) {
set_msi_affinity(vector, pending_irq_balance_cpumask[vector]);
cpus_clear(pending_irq_balance_cpumask[vector]);
}
}
#endif /* CONFIG_IRQBALANCE */
#endif /* CONFIG_SMP */
static void mask_MSI_irq(unsigned int vector)
@ -191,13 +184,13 @@ static void shutdown_msi_irq(unsigned int vector)
static void end_msi_irq_wo_maskbit(unsigned int vector)
{
move_msi(vector);
move_native_irq(vector);
ack_APIC_irq();
}
static void end_msi_irq_w_maskbit(unsigned int vector)
{
move_msi(vector);
move_native_irq(vector);
unmask_MSI_irq(vector);
ack_APIC_irq();
}

5
drivers/pci/msi.h
View File

@ -19,7 +19,6 @@
#define NR_HP_RESERVED_VECTORS 20
extern int vector_irq[NR_VECTORS];
extern cpumask_t pending_irq_balance_cpumask[NR_IRQS];
extern void (*interrupt[NR_IRQS])(void);
extern int pci_vector_resources(int last, int nr_released);
@ -29,10 +28,6 @@ extern int pci_vector_resources(int last, int nr_released);
#define set_msi_irq_affinity NULL
#endif
#ifndef CONFIG_IRQBALANCE
static inline void move_msi(int vector) {}
#endif
/*
* MSI-X Address Register
*/

7
include/asm-ia64/hw_irq.h
View File

@ -116,13 +116,6 @@ __ia64_local_vector_to_irq (ia64_vector vec)
* and to obtain the irq descriptor for a given irq number.
*/
/* Return a pointer to the irq descriptor for IRQ. */
static inline irq_desc_t *
irq_descp (int irq)
{
return irq_desc + irq;
}
/* Extract the IA-64 vector that corresponds to IRQ. */
static inline ia64_vector
irq_to_vector (int irq)

6
include/asm-ia64/irq.h
View File

@ -30,12 +30,6 @@ extern void disable_irq_nosync (unsigned int);
extern void enable_irq (unsigned int);
extern void set_irq_affinity_info (unsigned int irq, int dest, int redir);
#ifdef CONFIG_SMP
extern void move_irq(int irq);
#else
#define move_irq(irq)
#endif
struct irqaction;
struct pt_regs;
int handle_IRQ_event(unsigned int, struct pt_regs *, struct irqaction *);

123
include/linux/irq.h
View File

@ -71,16 +71,139 @@ typedef struct irq_desc {
unsigned int irq_count; /* For detecting broken interrupts */
unsigned int irqs_unhandled;
spinlock_t lock;
#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
unsigned int move_irq; /* Flag need to re-target intr dest*/
#endif
} ____cacheline_aligned irq_desc_t;
extern irq_desc_t irq_desc [NR_IRQS];
/* Return a pointer to the irq descriptor for IRQ. */
static inline irq_desc_t *
irq_descp (int irq)
{
return irq_desc + irq;
}
#include <asm/hw_irq.h> /* the arch dependent stuff */
extern int setup_irq(unsigned int irq, struct irqaction * new);
#ifdef CONFIG_GENERIC_HARDIRQS
extern cpumask_t irq_affinity[NR_IRQS];
#ifdef CONFIG_SMP
static inline void set_native_irq_info(int irq, cpumask_t mask)
{
irq_affinity[irq] = mask;
}
#else
static inline void set_native_irq_info(int irq, cpumask_t mask)
{
}
#endif
#ifdef CONFIG_SMP
#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
extern cpumask_t pending_irq_cpumask[NR_IRQS];
static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
{
irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
desc->move_irq = 1;
pending_irq_cpumask[irq] = mask;
spin_unlock_irqrestore(&desc->lock, flags);
}
static inline void
move_native_irq(int irq)
{
cpumask_t tmp;
irq_desc_t *desc = irq_descp(irq);
if (likely (!desc->move_irq))
return;
desc->move_irq = 0;
if (likely(cpus_empty(pending_irq_cpumask[irq])))
return;
if (!desc->handler->set_affinity)
return;
/* note - we hold the desc->lock */
cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
/*
* If there was a valid mask to work with, please
* do the disable, re-program, enable sequence.
* This is *not* particularly important for level triggered
* but in a edge trigger case, we might be setting rte
* when an active trigger is comming in. This could
* cause some ioapics to mal-function.
* Being paranoid i guess!
*/
if (unlikely(!cpus_empty(tmp))) {
desc->handler->disable(irq);
desc->handler->set_affinity(irq,tmp);
desc->handler->enable(irq);
}
cpus_clear(pending_irq_cpumask[irq]);
}
#ifdef CONFIG_PCI_MSI
/*
* Wonder why these are dummies?
* For e.g the set_ioapic_affinity_vector() calls the set_ioapic_affinity_irq()
* counter part after translating the vector to irq info. We need to perform
* this operation on the real irq, when we dont use vector, i.e when
* pci_use_vector() is false.
*/
static inline void move_irq(int irq)
{
}
static inline void set_irq_info(int irq, cpumask_t mask)
{
}
#else // CONFIG_PCI_MSI
static inline void move_irq(int irq)
{
move_native_irq(irq);
}
static inline void set_irq_info(int irq, cpumask_t mask)
{
set_native_irq_info(irq, mask);
}
#endif // CONFIG_PCI_MSI
#else // CONFIG_GENERIC_PENDING_IRQ || CONFIG_IRQBALANCE
#define move_irq(x)
#define move_native_irq(x)
#define set_pending_irq(x,y)
static inline void set_irq_info(int irq, cpumask_t mask)
{
set_native_irq_info(irq, mask);
}
#endif // CONFIG_GENERIC_PENDING_IRQ
#else // CONFIG_SMP
#define move_irq(x)
#define move_native_irq(x)
#endif // CONFIG_SMP
extern int no_irq_affinity;
extern int noirqdebug_setup(char *str);

4
kernel/irq/manage.c
View File

@ -18,6 +18,10 @@
cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
#endif
/**
* synchronize_irq - wait for pending IRQ handlers (on other CPUs)
*

14
kernel/irq/proc.c
View File

@ -19,12 +19,22 @@ static struct proc_dir_entry *root_irq_dir, *irq_dir[NR_IRQS];
*/
static struct proc_dir_entry *smp_affinity_entry[NR_IRQS];
void __attribute__((weak))
proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
#ifdef CONFIG_GENERIC_PENDING_IRQ
void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
{
/*
* Save these away for later use. Re-progam when the
* interrupt is pending
*/
set_pending_irq(irq, mask_val);
}
#else
void proc_set_irq_affinity(unsigned int irq, cpumask_t mask_val)
{
irq_affinity[irq] = mask_val;
irq_desc[irq].handler->set_affinity(irq, mask_val);
}
#endif
static int irq_affinity_read_proc(char *page, char **start, off_t off,
int count, int *eof, void *data)