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x86/irq: remove leftover code from NUMA_MIGRATE_IRQ_DESC 

The original feature of migrating irq_desc dynamic was too fragile
and was causing problems: it caused crashes on systems with lots of
cards with MSI-X when user-space irq-balancer was enabled.

We now have new patches that create irq_desc according to device
numa node. This patch removes the leftover bits of the dynamic balancer.

[ Impact: remove dead code ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <49F654AF.8000808@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2009-04-27 17:58:23 -07:00 committed by Ingo Molnar
parent 9ec4fa271f
commit fcef5911c7
8 changed files with 9 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/x86/Kconfig
View File

@ -274,16 +274,6 @@ config SPARSE_IRQ
If you don't know what to do here, say N.
config NUMA_MIGRATE_IRQ_DESC
bool "Move irq desc when changing irq smp_affinity"
depends on SPARSE_IRQ && NUMA
depends on BROKEN
default n
---help---
This enables moving irq_desc to cpu/node that irq will use handled.
If you don't know what to do here, say N.
config X86_MPPARSE
bool "Enable MPS table" if ACPI
default y

1
arch/x86/configs/x86_64_defconfig
View File

@ -195,7 +195,6 @@ CONFIG_HIGH_RES_TIMERS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
CONFIG_SMP=y
CONFIG_SPARSE_IRQ=y
# CONFIG_NUMA_MIGRATE_IRQ_DESC is not set
CONFIG_X86_FIND_SMP_CONFIG=y
CONFIG_X86_MPPARSE=y
# CONFIG_X86_ELAN is not set

56
arch/x86/kernel/apic/io_apic.c
View File

@ -148,9 +148,6 @@ struct irq_cfg {
unsigned move_cleanup_count;
u8 vector;
u8 move_in_progress : 1;
#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
u8 move_desc_pending : 1;
#endif
};
/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
@ -254,8 +251,7 @@ int arch_init_chip_data(struct irq_desc *desc, int cpu)
return 0;
}
#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
/* for move_irq_desc */
static void
init_copy_irq_2_pin(struct irq_cfg *old_cfg, struct irq_cfg *cfg, int cpu)
{
@ -356,19 +352,7 @@ void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc)
old_desc->chip_data = NULL;
}
}
static void
set_extra_move_desc(struct irq_desc *desc, const struct cpumask *mask)
{
struct irq_cfg *cfg = desc->chip_data;
if (!cfg->move_in_progress) {
/* it means that domain is not changed */
if (!cpumask_intersects(desc->affinity, mask))
cfg->move_desc_pending = 1;
}
}
#endif
/* end for move_irq_desc */
#else
static struct irq_cfg *irq_cfg(unsigned int irq)
@ -378,13 +362,6 @@ static struct irq_cfg *irq_cfg(unsigned int irq)
#endif
#ifndef CONFIG_NUMA_MIGRATE_IRQ_DESC
static inline void
set_extra_move_desc(struct irq_desc *desc, const struct cpumask *mask)
{
}
#endif
struct io_apic {
unsigned int index;
unsigned int unused[3];
@ -592,9 +569,6 @@ set_desc_affinity(struct irq_desc *desc, const struct cpumask *mask)
if (assign_irq_vector(irq, cfg, mask))
return BAD_APICID;
/* check that before desc->addinity get updated */
set_extra_move_desc(desc, mask);
cpumask_copy(desc->affinity, mask);
return apic->cpu_mask_to_apicid_and(desc->affinity, cfg->domain);
@ -2393,8 +2367,6 @@ migrate_ioapic_irq_desc(struct irq_desc *desc, const struct cpumask *mask)
if (assign_irq_vector(irq, cfg, mask))
return;
set_extra_move_desc(desc, mask);
dest = apic->cpu_mask_to_apicid_and(cfg->domain, mask);
irte.vector = cfg->vector;
@ -2491,34 +2463,14 @@ static void irq_complete_move(struct irq_desc **descp)
struct irq_cfg *cfg = desc->chip_data;
unsigned vector, me;
if (likely(!cfg->move_in_progress)) {
#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
if (likely(!cfg->move_desc_pending))
return;
/* domain has not changed, but affinity did */
me = smp_processor_id();
if (cpumask_test_cpu(me, desc->affinity)) {
*descp = desc = move_irq_desc(desc, me);
/* get the new one */
cfg = desc->chip_data;
cfg->move_desc_pending = 0;
}
#endif
if (likely(!cfg->move_in_progress))
return;
}
vector = ~get_irq_regs()->orig_ax;
me = smp_processor_id();
if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain)) {
#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
*descp = desc = move_irq_desc(desc, me);
/* get the new one */
cfg = desc->chip_data;
#endif
if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
send_cleanup_vector(cfg);
}
}
#else
static inline void irq_complete_move(struct irq_desc **descp) {}

10
include/linux/irq.h
View File

@ -212,16 +212,6 @@ extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int cpu);
extern struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu);
static inline struct irq_desc *
irq_remap_to_desc(unsigned int irq, struct irq_desc *desc)
{
#ifdef CONFIG_NUMA_MIGRATE_IRQ_DESC
return irq_to_desc(irq);
#else
return desc;
#endif
}
/*
* Migration helpers for obsolete names, they will go away:
*/

2
kernel/irq/Makefile
View File

@ -3,5 +3,5 @@ obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o
obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
obj-$(CONFIG_NUMA_MIGRATE_IRQ_DESC) += numa_migrate.o
obj-$(CONFIG_SPARSE_IRQ) += numa_migrate.o
obj-$(CONFIG_PM_SLEEP) += pm.o

12
kernel/irq/chip.c
View File

@ -359,7 +359,6 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
spin_lock(&desc->lock);
mask_ack_irq(desc, irq);
desc = irq_remap_to_desc(irq, desc);
if (unlikely(desc->status & IRQ_INPROGRESS))
goto out_unlock;
@ -438,7 +437,6 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
desc->status &= ~IRQ_INPROGRESS;
out:
desc->chip->eoi(irq);
desc = irq_remap_to_desc(irq, desc);
spin_unlock(&desc->lock);
}
@ -475,7 +473,6 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
!desc->action)) {
desc->status |= (IRQ_PENDING | IRQ_MASKED);
mask_ack_irq(desc, irq);
desc = irq_remap_to_desc(irq, desc);
goto out_unlock;
}
kstat_incr_irqs_this_cpu(irq, desc);
@ -483,7 +480,6 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
/* Start handling the irq */
if (desc->chip->ack)
desc->chip->ack(irq);
desc = irq_remap_to_desc(irq, desc);
/* Mark the IRQ currently in progress.*/
desc->status |= IRQ_INPROGRESS;
@ -544,10 +540,8 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
if (!noirqdebug)
note_interrupt(irq, desc, action_ret);
if (desc->chip->eoi) {
if (desc->chip->eoi)
desc->chip->eoi(irq);
desc = irq_remap_to_desc(irq, desc);
}
}
void
@ -582,10 +576,8 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
/* Uninstall? */
if (handle == handle_bad_irq) {
if (desc->chip != &no_irq_chip) {
if (desc->chip != &no_irq_chip)
mask_ack_irq(desc, irq);
desc = irq_remap_to_desc(irq, desc);
}
desc->status |= IRQ_DISABLED;
desc->depth = 1;
}

9
kernel/irq/handle.c
View File

@ -458,11 +458,8 @@ unsigned int __do_IRQ(unsigned int irq)
/*
* No locking required for CPU-local interrupts:
*/
if (desc->chip->ack) {
if (desc->chip->ack)
desc->chip->ack(irq);
/* get new one */
desc = irq_remap_to_desc(irq, desc);
}
if (likely(!(desc->status & IRQ_DISABLED))) {
action_ret = handle_IRQ_event(irq, desc->action);
if (!noirqdebug)
@ -473,10 +470,8 @@ unsigned int __do_IRQ(unsigned int irq)
}
spin_lock(&desc->lock);
if (desc->chip->ack) {
if (desc->chip->ack)
desc->chip->ack(irq);
desc = irq_remap_to_desc(irq, desc);
}
/*
* REPLAY is when Linux resends an IRQ that was dropped earlier
* WAITING is used by probe to mark irqs that are being tested

2
kernel/irq/numa_migrate.c
View File

@ -97,9 +97,7 @@ static struct irq_desc *__real_move_irq_desc(struct irq_desc *old_desc,
/* free the old one */
free_one_irq_desc(old_desc, desc);
spin_unlock(&old_desc->lock);
kfree(old_desc);
spin_lock(&desc->lock);
return desc;