linux-kernel - Re: [Patch Part2 v4 00/31] Enable hierarchy irqdomian on x86 platforms

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Message-ID: <20141104144730.GE14512@8bytes.org>
Date:	Tue, 4 Nov 2014 15:47:30 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Patch Part2 v4 00/31] Enable hierarchy irqdomian on x86
 platforms

Hi Jiang,

On Tue, Nov 04, 2014 at 08:01:34PM +0800, Jiang Liu wrote:
> This is the second patch set to enable support of hierarchy irqdomain
> on x86 platforms. It depends on the first part at:
> https://lkml.org/lkml/2014/10/27/122
> And you may access it at:
> https://github.com/jiangliu/linux.git irqdomain/p2v4

I gave this some testing on a couple of machines. Unfortunatly it panics
on my AMD Kaveri system with IOMMU enabled in drivers/pci/msi.c:

static void msi_set_mask_bit(struct irq_data *data, u32 flag)
{
        struct msi_desc *desc = irq_data_get_msi(data);

        if (desc->msi_attrib.is_msix) {		<-- at this line something goes wrong
                msix_mask_irq(desc, flag);
                readl(desc->mask_base);         /* Flush write to device */
        } else {
                unsigned offset = data->irq - desc->irq;
                msi_mask_irq(desc, 1 << offset, flag << offset);
        }
}

I am further investigating to find out what went wrong, but maybe you
also have an idea?


	Joerg

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