From mboxrd@z Thu Jan  1 00:00:00 1970
References: <20210111064318.6154-1-hongzhan.chen@intel.com>
 <20210111064318.6154-6-hongzhan.chen@intel.com>
From: Philippe Gerum <rpm@xenomai.org>
Subject: Re: [PATCH 06/10] dovetail/pipeline: implement oob irq request and
 free and post for both TIMER_OOB_IPI and RESCHEDULE_OOB_IPI
In-reply-to: <20210111064318.6154-6-hongzhan.chen@intel.com>
Date: Tue, 12 Jan 2021 17:39:09 +0100
Message-ID: <87im82m7o2.fsf@xenomai.org>
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To: hongzha1 <hongzhan.chen@intel.com>
Cc: xenomai@xenomai.org


hongzha1 via Xenomai <xenomai@xenomai.org> writes:

> Signed-off-by: hongzha1 <hongzhan.chen@intel.com>
> ---
>  .../kernel/dovetail/pipeline/pipeline.h       | 44 ++++++++++++++-----
>  1 file changed, 34 insertions(+), 10 deletions(-)
>
> diff --git a/include/cobalt/kernel/dovetail/pipeline/pipeline.h b/include/cobalt/kernel/dovetail/pipeline/pipeline.h
> index 23c4a2c18..a345e1399 100644
> --- a/include/cobalt/kernel/dovetail/pipeline/pipeline.h
> +++ b/include/cobalt/kernel/dovetail/pipeline/pipeline.h
> @@ -8,9 +8,12 @@
>  #include <linux/irq_pipeline.h>
>  #include <cobalt/kernel/assert.h>
>  #include <asm/xenomai/features.h>
> +#include <pipeline/machine.h>
>  
>  typedef unsigned long spl_t;
>  
> +extern void xnintr_core_clock_handler(void);
> +

No need for mentioning the storage class in the declaration. We know
this is extern by default, otherwise we would have mentioned
"static". Will fix while merging.

>  /*
>   * We only keep the LSB when testing in SMP mode in order to strip off
>   * the recursion marker (0x2) the nklock may store there.
> @@ -30,18 +33,29 @@ typedef unsigned long spl_t;
>  
>  #ifdef CONFIG_SMP
>  
> +static irqreturn_t reschedule_interrupt_handler(int irq, void *dev_id)
> +{
> +
> +	/* Will reschedule from irq_exit_pipeline. */
> +
> +	return IRQ_HANDLED;
> +}
> +
> +
>  static inline int pipeline_request_resched_ipi(void (*handler)(void))
>  {
>  	/* Trap the out-of-band rescheduling interrupt. */
> -	TODO();
> -
> -	return 0;
> +	return __request_percpu_irq(RESCHEDULE_OOB_IPI,
> +			reschedule_interrupt_handler,
> +			IRQF_OOB,
> +			"Xenomai reschedule",
> +			&cobalt_machine_cpudata);
>  }
>  
>  static inline void pipeline_free_resched_ipi(void)
>  {
>  	/* Release the out-of-band rescheduling interrupt. */
> -	TODO();
> +	free_percpu_irq(RESCHEDULE_OOB_IPI, &cobalt_machine_cpudata);
>  }
>  
>  static inline void pipeline_send_resched_ipi(const struct cpumask *dest)
> @@ -50,21 +64,31 @@ static inline void pipeline_send_resched_ipi(const struct cpumask *dest)
>  	 * Trigger the out-of-band rescheduling interrupt on remote
>  	 * CPU(s).
>  	 */
> -	TODO();
> +	irq_pipeline_send_remote(RESCHEDULE_OOB_IPI, dest);

This call was recently renamed irq_send_oob_ipi() in an effort to
clarify the interface. I'll fix this up while merging.

>  }
>  
> +static irqreturn_t timer_ipi_interrupt_handler(int irq, void *dev_id)
> +{
> +	xnintr_core_clock_handler();
> +
> +	return IRQ_HANDLED;
> +}
> +
> +
>  static inline int pipeline_request_timer_ipi(void (*handler)(void))
>  {
>  	/* Trap the out-of-band timer interrupt. */
> -	TODO();
> -
> -	return 0;
> +	return __request_percpu_irq(TIMER_OOB_IPI,
> +			timer_ipi_interrupt_handler,
> +			IRQF_OOB, "Xenomai timer IPI",
> +			&cobalt_machine_cpudata);
>  }
>  
>  static inline void pipeline_free_timer_ipi(void)
>  {
>  	/* Release the out-of-band timer interrupt. */
> -	TODO();
> +	free_percpu_irq(TIMER_OOB_IPI,
> +		&cobalt_machine_cpudata);

Single line. Will fix.

>  }
>  
>  static inline void pipeline_send_timer_ipi(const struct cpumask *dest)
> @@ -72,7 +96,7 @@ static inline void pipeline_send_timer_ipi(const struct cpumask *dest)
>  	/*
>  	 * Trigger the out-of-band timer interrupt on remote CPU(s).
>  	 */
> -	TODO();
> +	irq_pipeline_send_remote(TIMER_OOB_IPI, dest);
>  }

Ditto.

Ack.

-- 
Philippe.