linux-kernel - Re: [RFC 2/4] introduce dynamically allocated system vectors

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Date:	Sun, 14 Sep 2008 17:39:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Dean Nelson <dcn@....com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alan Mayer <ajm@....com>, jeremy@...p.org,
	rusty@...tcorp.com.au, suresh.b.siddha@...el.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <Yinghai.lu@....com>
Subject: Re: [RFC 2/4] introduce dynamically allocated system vectors


* Dean Nelson <dcn@....com> wrote:

> Introduce the dynamic allocation and deallocation of system vectors which
> are mapped to irq numbers allowing the use of request_irq()/free_irq().
> 
> Signed-off-by: Dean Nelson <dcn@....com>
> 
> ---
> 
>  arch/x86/kernel/apic.c        |    3 
>  arch/x86/kernel/io_apic.c     |  264 +++++++++++++++++++++++++++++++++-----

it's not clean to put it into io_apic.c:

> -static int __assign_irq_vector(int irq, cpumask_t mask)
> +bool __grab_irq_vector(struct irq_desc *desc, unsigned int vector,
> +		       cpumask_t *new_domain_mask)

please put it into arch/x86/kernel/irq.c or so.

this bit:

> Index: linux/include/linux/irq.h
> ===================================================================
> --- linux.orig/include/linux/irq.h	2008-09-10 12:08:46.000000000 -0500
> +++ linux/include/linux/irq.h	2008-09-11 06:53:16.000000000 -0500
> @@ -390,11 +390,22 @@ set_irq_chained_handler(unsigned int irq
>  extern void set_irq_noprobe(unsigned int irq);
>  extern void set_irq_probe(unsigned int irq);
>  
> -/* Handle dynamic irq creation and destruction */
> +/* Handle dynamic irq device vector allocation and deallocation */
>  extern unsigned int create_irq_nr(unsigned int irq_want);
>  extern int create_irq(void);
>  extern void destroy_irq(unsigned int irq);
>  
> +/* Handle dynamic irq system vector allocation and deallocation */
> +extern unsigned int create_irq_system_vector(cpumask_t *mask, int priority,
> +					     char *irq_name,
> +					     int *assigned_vector);
> +#define IRQ_PRIORITY_LOW	1
> +#define IRQ_PRIORITY_HIGH	2
> +
> +extern void destroy_irq_system_vector(unsigned int irq);
> +
> +extern int reserve_system_vectors(int number);

does not belong into the generic kernel code - it's an x86 property.

	Ingo
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