linux-kernel - Re: [patch 2/2] fastboot: use a DMI match table to set defaults for port-disable

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Date:	Wed, 20 Aug 2008 16:46:06 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [patch 2/2] fastboot: use a DMI match table to set defaults for port-disable

On Monday 11 August 2008 04:37:30 pm Arjan van de Ven wrote:
> 
> From: Arjan van de Ven <arjan@...ux.intel.com>
> Subject: [PATCH] libata: use a DMI match table to set defaults for port-disable
> 
> As suggested by Jeff:
> This patch adds a DMI table that is used for setting defaults for
> the new dont-probe-port parameter boot time optimization feature.

Isn't this the sort of thing we theoretically could learn from ACPI?
I know we haven't really taken advantage of what ACPI tells us about
the presence of legacy devices like COM ports and IDE ports, but
maybe we should.

> +static int __init dmi_disable_ports(const struct dmi_system_id *d)
> +{
> +	int value = (unsigned long)d->driver_data;
> +
> +	printk(KERN_INFO "libata: DMI match used to disable probing\n");
> +	libata_disable_ports |= value;
> +	return 0;
> +}
> +
> +#define DMI_PORT_ATA1 (void *)0x1
> +#define DMI_PORT_ATA2 (void *)0x2
> +#define DMI_PORT_ATA3 (void *)0x4
> +#define DMI_PORT_ATA4 (void *)0x8
> +
> +static struct dmi_system_id libata_dmi_table[] __initdata = {
> +	/*
> +	 * The Asus EeePC901 has its devices attached to ATA2 only
> +	 */
> +	{
> +	.callback = dmi_disable_ports,
> +	.driver_data = DMI_PORT_ATA1,
> +	.ident = "Asus EeePC 901",
> +	.matches = {
> +		     DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
> +		     DMI_MATCH(DMI_PRODUCT_NAME, "901"),
> +		},
> +	},
> +	{}
> +};
> +
> +
>  /**
>   *	ata_force_cbl - force cable type according to libata.force
>   *	@ap: ATA port of interest
> @@ -6126,6 +6158,7 @@ static void __init ata_parse_force_param(void)
>  static int __init ata_init(void)
>  {
>  	ata_parse_force_param();
> +	dmi_check_system(libata_dmi_table);
>  
>  	ata_wq = create_workqueue("ata");
>  	if (!ata_wq)


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