linux-kernel - Re: Fix interrupt remapping hang if interrupt remapping disable in BIOS

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Date:	Wed, 9 Sep 2009 06:46:06 -0400
From:	"Youquan,Song" <youquan.song@...el.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Youquan Song <youquan.song@...el.com>, mingo@...e.hu,
	hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	dwmw2@...radead.org, Suresh Siddha <suresh.b.siddha@...el.com>,
	youqun.song@...el.com
Subject: Re: Fix interrupt remapping hang if interrupt remapping disable in BIOS

On Mon, Sep 07, 2009 at 06:59:40PM +0400, Cyrill Gorcunov wrote:
> [Youquan Song - Mon, Sep 07, 2009 at 10:13:13AM -0400]
> ...  
> |  static int disable_intremap;
> |  static __init int setup_nointremap(char *str)
> | @@ -607,9 +608,14 @@ end:
> |  int __init intr_remapping_supported(void)
> |  {
> |  	struct dmar_drhd_unit *drhd;
> | -
> | +	struct acpi_table_dmar *dmar;
> | +
> |  	if (disable_intremap)
> |  		return 0;
> | +
> | +	dmar = (struct acpi_table_dmar *)dmar_tbl;
> | +	if (!(dmar->flags & 0x1))
> | +		return 0;
> |  
> |  	for_each_drhd_unit(drhd) {
> |  		struct intel_iommu *iommu = drhd->iommu;
> 
> Hi Youquan,
> 
> perhaps we could move this test to helper function
> in dmar.c instead of plain external variable test?

Good point. I will update it and send it out soon.

- Youquan


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