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genirq: Add IRQ_AFFINITY_MANAGED flag

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Add IRQ_AFFINITY_MANAGED flag and related kernel APIs so that
kernel driver can modify an irq's status in such a way that
user space affinity change will be ignored. Kernel space's
affinity setting will not be changed.

Change-Id: Ib2d5ea651263bff4317562af69079ad950c9e71e
Signed-off-by: Runmin Wang <runminw@codeaurora.org>
This commit is contained in:
Runmin Wang 2017-01-23 12:30:07 -08:00
parent 1cc869442a
commit 778031ccb5
3 changed files with 19 additions and 2 deletions
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4
include/linux/irq.h
View file

@ -73,6 +73,7 @@ enum irqchip_irq_state;
* it from the spurious interrupt detection
* mechanism and from core side polling.
* IRQ_DISABLE_UNLAZY - Disable lazy irq disable
* IRQ_AFFINITY_MANAGED - Affinity is auto-managed by the kernel
*/
enum {
IRQ_TYPE_NONE = 0x00000000,
@ -99,13 +100,14 @@ enum {
IRQ_PER_CPU_DEVID = (1 << 17),
IRQ_IS_POLLED = (1 << 18),
IRQ_DISABLE_UNLAZY = (1 << 19),
IRQ_AFFINITY_MANAGED = (1 << 21),
};
#define IRQF_MODIFY_MASK \
(IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY)
IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_AFFINITY_MANAGED)
#define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)

5
kernel/irq/chip.c
View file

@ -836,7 +836,8 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
irq_settings_clr_and_set(desc, clr, set);
irqd_clear(&desc->irq_data, IRQD_NO_BALANCING | IRQD_PER_CPU |
IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT);
IRQD_TRIGGER_MASK | IRQD_LEVEL | IRQD_MOVE_PCNTXT |
IRQD_AFFINITY_MANAGED);
if (irq_settings_has_no_balance_set(desc))
irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
if (irq_settings_is_per_cpu(desc))
@ -845,6 +846,8 @@ void irq_modify_status(unsigned int irq, unsigned long clr, unsigned long set)
irqd_set(&desc->irq_data, IRQD_MOVE_PCNTXT);
if (irq_settings_is_level(desc))
irqd_set(&desc->irq_data, IRQD_LEVEL);
if (irq_settings_has_affinity_managed_set(desc))
irqd_set(&desc->irq_data, IRQD_AFFINITY_MANAGED);
irqd_set(&desc->irq_data, irq_settings_get_trigger_mask(desc));

12
kernel/irq/settings.h
View file

@ -17,6 +17,7 @@ enum {
_IRQ_IS_POLLED = IRQ_IS_POLLED,
_IRQ_DISABLE_UNLAZY = IRQ_DISABLE_UNLAZY,
_IRQF_MODIFY_MASK = IRQF_MODIFY_MASK,
_IRQ_AFFINITY_MANAGED = IRQ_AFFINITY_MANAGED,
};
#define IRQ_PER_CPU GOT_YOU_MORON
@ -32,6 +33,7 @@ enum {
#define IRQ_DISABLE_UNLAZY GOT_YOU_MORON
#undef IRQF_MODIFY_MASK
#define IRQF_MODIFY_MASK GOT_YOU_MORON
#define IRQ_AFFINITY_MANAGED GOT_YOU_MORON
static inline void
irq_settings_clr_and_set(struct irq_desc *desc, u32 clr, u32 set)
@ -65,6 +67,16 @@ static inline bool irq_settings_has_no_balance_set(struct irq_desc *desc)
return desc->status_use_accessors & _IRQ_NO_BALANCING;
}
static inline void irq_settings_set_affinity_managed(struct irq_desc *desc)
{
desc->status_use_accessors |= _IRQ_AFFINITY_MANAGED;
}
static inline bool irq_settings_has_affinity_managed_set(struct irq_desc *desc)
{
return desc->status_use_accessors & _IRQ_AFFINITY_MANAGED;
}
static inline u32 irq_settings_get_trigger_mask(struct irq_desc *desc)
{
return desc->status_use_accessors & IRQ_TYPE_SENSE_MASK;