linux-kernel - Re: [PATCH 1/2] powerpc/44x: Fix PCI MSI support for Maui APM821xx SoC and Bluestone board

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Message-ID: <1331264145.3105.56.camel@pasglop>
Date:	Fri, 09 Mar 2012 14:35:45 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Mai La <mla@....com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	Tirumala R Marri <tmarri@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Michael Neuling <mikey@...ling.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Anton Blanchard <anton@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	open-source-review@....com
Subject: Re: [PATCH 1/2] powerpc/44x: Fix PCI MSI support for Maui APM821xx
 SoC and Bluestone board

On Fri, 2012-03-09 at 10:17 +0700, Mai La wrote:
> This patch consists of:
> - Enable PCI MSI as default for Bluestone board
> - Define number of MSI interrupt for Maui APM821xx SoC using in Bluestone board
> - Fix returning ENODEV as finding MSI node
> - Fix MSI physical high and low address
> - Keep MSI data logically
> 
> Signed-off-by: Mai La <mla@....com>
> ---

> index 7b4df37..c86231e 100644
> --- a/arch/powerpc/sysdev/Kconfig
> +++ b/arch/powerpc/sysdev/Kconfig
> @@ -20,6 +20,12 @@ config PPC_MSI_BITMAP
>  	default y if FSL_PCI
>  	default y if PPC4xx_MSI
>  
> +config PPC4xx_NR_MSI_IRQS
> +	int "Number of PCI MSI interrupts"
> +	depends on PCI_MSI && PPC4xx_MSI
> +	default "4" if !APM821xx
> +	default "8" if APM821xx
> +

 .../...

> +#define NR_MSI_IRQS CONFIG_PPC4xx_NR_MSI_IRQS

ARGH.

We asked to -NOT MAKE THIS A COMPILE TIME OPTION-

CONFIG_foo is as bad as your previous ifdef, in fact you just added a
useless config option here.

Make that number dynamic. Count the entries in the device-tree (or add
a property with the number in it, whatever you fancy the most) but make
it something detected at RUNTIME !!!!!

Ben.


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