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genirq: Separate activation and startup

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Activation of an interrupt and startup are currently a combo
functionlity. That works so far, but upcoming changes require a strict
separation because the activation can fail in future.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Yu Chen <yu.c.chen@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Link: https://lkml.kernel.org/r/20170913213152.754334077@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-09-13 23:29:09 +02:00
parent 239306fee8
commit c942cee46b
4 changed files with 43 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/irq/autoprobe.c
View File

@ -53,7 +53,7 @@ unsigned long probe_irq_on(void)
if (desc->irq_data.chip->irq_set_type)
desc->irq_data.chip->irq_set_type(&desc->irq_data,
IRQ_TYPE_PROBE);
irq_startup(desc, IRQ_NORESEND, IRQ_START_FORCE);
irq_activate_and_startup(desc, IRQ_NORESEND);
}
raw_spin_unlock_irq(&desc->lock);
}

30
kernel/irq/chip.c
View File

@ -207,20 +207,19 @@ __irq_startup_managed(struct irq_desc *desc, struct cpumask *aff, bool force)
* Catch code which fiddles with enable_irq() on a managed
* and potentially shutdown IRQ. Chained interrupt
* installment or irq auto probing should not happen on
* managed irqs either. Emit a warning, break the affinity
* and start it up as a normal interrupt.
* managed irqs either.
*/
if (WARN_ON_ONCE(force))
return IRQ_STARTUP_NORMAL;
return IRQ_STARTUP_ABORT;
/*
* The interrupt was requested, but there is no online CPU
* in it's affinity mask. Put it into managed shutdown
* state and let the cpu hotplug mechanism start it up once
* a CPU in the mask becomes available.
*/
irqd_set_managed_shutdown(d);
return IRQ_STARTUP_ABORT;
}
irq_domain_activate_irq(d);
return IRQ_STARTUP_MANAGED;
}
#else
@ -236,7 +235,9 @@ static int __irq_startup(struct irq_desc *desc)
struct irq_data *d = irq_desc_get_irq_data(desc);
int ret = 0;
irq_domain_activate_irq(d);
/* Warn if this interrupt is not activated but try nevertheless */
WARN_ON_ONCE(!irqd_is_activated(d));
if (d->chip->irq_startup) {
ret = d->chip->irq_startup(d);
irq_state_clr_disabled(desc);
@ -269,6 +270,7 @@ int irq_startup(struct irq_desc *desc, bool resend, bool force)
irq_set_affinity_locked(d, aff, false);
break;
case IRQ_STARTUP_ABORT:
irqd_set_managed_shutdown(d);
return 0;
}
}
@ -278,6 +280,22 @@ int irq_startup(struct irq_desc *desc, bool resend, bool force)
return ret;
}
int irq_activate(struct irq_desc *desc)
{
struct irq_data *d = irq_desc_get_irq_data(desc);
if (!irqd_affinity_is_managed(d))
irq_domain_activate_irq(d);
return 0;
}
void irq_activate_and_startup(struct irq_desc *desc, bool resend)
{
if (WARN_ON(irq_activate(desc)))
return;
irq_startup(desc, resend, IRQ_START_FORCE);
}
static void __irq_disable(struct irq_desc *desc, bool mask);
void irq_shutdown(struct irq_desc *desc)
@ -953,7 +971,7 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
irq_settings_set_norequest(desc);
irq_settings_set_nothread(desc);
desc->action = &chained_action;
irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
irq_activate_and_startup(desc, IRQ_RESEND);
}
}

2
kernel/irq/internals.h
View File

@ -74,6 +74,8 @@ extern void __enable_irq(struct irq_desc *desc);
#define IRQ_START_FORCE true
#define IRQ_START_COND false
extern int irq_activate(struct irq_desc *desc);
extern void irq_activate_and_startup(struct irq_desc *desc, bool resend);
extern int irq_startup(struct irq_desc *desc, bool resend, bool force);
extern void irq_shutdown(struct irq_desc *desc);

17
kernel/irq/manage.c
View File

@ -519,7 +519,7 @@ void __enable_irq(struct irq_desc *desc)
* time. If it was already started up, then irq_startup()
* will invoke irq_enable() under the hood.
*/
irq_startup(desc, IRQ_RESEND, IRQ_START_COND);
irq_startup(desc, IRQ_RESEND, IRQ_START_FORCE);
break;
}
default:
@ -1325,6 +1325,21 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
goto out_unlock;
}
/*
* Activate the interrupt. That activation must happen
* independently of IRQ_NOAUTOEN. request_irq() can fail
* and the callers are supposed to handle
* that. enable_irq() of an interrupt requested with
* IRQ_NOAUTOEN is not supposed to fail. The activation
* keeps it in shutdown mode, it merily associates
* resources if necessary and if that's not possible it
* fails. Interrupts which are in managed shutdown mode
* will simply ignore that activation request.
*/
ret = irq_activate(desc);
if (ret)
goto out_unlock;
desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
IRQS_ONESHOT | IRQS_WAITING);
irqd_clear(&desc->irq_data, IRQD_IRQ_INPROGRESS);