linux-kernel - Re: [Bugfix 1/3] xen/pci: Kill function xen_setup_acpi

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Message-ID: <54BE25F3.3030807@citrix.com>
Date:	Tue, 20 Jan 2015 09:54:59 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Sander Eikelenboom <linux@...elenboom.it>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	Tony Luck <tony.luck@...el.com>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>
Subject: Re: [Bugfix 1/3] xen/pci: Kill function xen_setup_acpi_sci()

On 20/01/15 02:21, Jiang Liu wrote:
> Currently Xen Domain0 has special treatment for ACPI SCI interrupt,
> that is initialize irq for ACPI SCI at early stage in a special way as:
> xen_init_IRQ()
> 	->pci_xen_initial_domain()
> 		->xen_setup_acpi_sci()
> 			Allocate and initialize irq for ACPI SCI
> 
> Function xen_setup_acpi_sci() calls acpi_gsi_to_irq() to get an irq
> number for ACPI SCI. But unfortunately acpi_gsi_to_irq() depends on
> IOAPIC irqdomains through following path
> acpi_gsi_to_irq()
> 	->mp_map_gsi_to_irq()
> 		->mp_map_pin_to_irq()
> 			->check IOAPIC irqdomain

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

Thanks.

David
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