RE: [PATCH v3 2/2] pci/aer: interrupt fixup in the quirk

[Po Liu <po.liu@nxp.com>]

Hi Bjorn,

Sorry for late reply.

I checked the updated kernel with Dongdong mentioned ACPI patch which was truly affected my quirk patch uploaded. So I suppose the quirk patch is not qualify to fix the bug.

I were keep thinking what your "explicitly checking for a root port device" meaning. Do you mean I should upload again the first version patch which fix it in the portdrv_core.c ? I would upload again if yes. 

Thanks!


Best regards,
Liu Po

>  -----Original Message-----
>  From: Bjorn Helgaas [mailto:helgaas@kernel.org]
>  Sent: Saturday, July 30, 2016 6:42 AM
>  To: Po Liu
>  Cc: linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org;
>  linux-kernel@vger.kernel.org; devicetree@vger.kernel.org; Roy Zang; Arnd
>  Bergmann; Marc Zyngier; Stuart Yoder; Yang-Leo Li; Minghuan Lian; Murali
>  Karicheri; Bjorn Helgaas; Shawn Guo; Mingkai Hu
>  Subject: Re: [PATCH v3 2/2] pci/aer: interrupt fixup in the quirk
>  
>  On Tue, Jun 14, 2016 at 04:24:05PM +0800, Po Liu wrote:
>  > On some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode.
>  > When chip support the aer interrupt with none MSI/MSI-X/INTx mode,
>  > maybe there is interrupt line for aer pme etc. Search the interrupt
>  > number in the fdt file. Then fixup the dev->irq with it.
>  >
>  > Signed-off-by: Po Liu <po.liu@nxp.com>
>  
>  I'm not sure where we're at with this.  Dongdong had some issue
>  (possibly with a version of the quirk on a different platform?), and I
>  think the suggestion of explicitly checking for a root port device was a
>  good one.
>  
>  So please update and repost this for next cycle.
>  
>  > ---
>  > changes for V3:
>  > 	- Move to quirk;
>  > 	- Only correct the irq in RC mode;
>  >
>  >  drivers/pci/quirks.c | 29 +++++++++++++++++++++++++++++
>  >  1 file changed, 29 insertions(+)
>  >
>  > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index
>  > ee72ebe..8b39cce 100644
>  > --- a/drivers/pci/quirks.c
>  > +++ b/drivers/pci/quirks.c
>  > @@ -25,6 +25,7 @@
>  >  #include <linux/sched.h>
>  >  #include <linux/ktime.h>
>  >  #include <linux/mm.h>
>  > +#include <linux/of_irq.h>
>  >  #include <asm/dma.h>	/* isa_dma_bridge_buggy */
>  >  #include "pci.h"
>  >
>  > @@ -4419,3 +4420,31 @@ static void quirk_intel_qat_vf_cap(struct
>  pci_dev *pdev)
>  >  	}
>  >  }
>  >  DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x443,
>  > quirk_intel_qat_vf_cap);
>  > +
>  > +/* If root port doesn't support MSI/MSI-X/INTx in RC mode,
>  > + * but use standalone irq. Read the device tree for the aer
>  > + * interrupt number.
>  > + */
>  > +static void quirk_aer_interrupt(struct pci_dev *dev) {
>  > +	int ret;
>  > +	u8 header_type;
>  > +	struct device_node *np = NULL;
>  > +
>  > +	/* Only for the RC mode device */
>  > +	pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
>  > +	if ((header_type & 0x7F) != PCI_HEADER_TYPE_BRIDGE)
>  > +		return;
>  > +
>  > +	if (dev->bus->dev.of_node)
>  > +		np = dev->bus->dev.of_node;
>  > +
>  > +	if (IS_ENABLED(CONFIG_OF_IRQ) && np) {
>  > +		ret = of_irq_get_byname(np, "aer");
>  > +		if (ret > 0) {
>  > +			dev->no_msi = 1;
>  > +			dev->irq = ret;
>  > +		}
>  > +	}
>  > +}
>  > +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID,
>  > +quirk_aer_interrupt);
>  > --
>  > 2.1.0.27.g96db324
>  >
>  >
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