linux-kernel - RE: [PATCH v2 2/2] pci/aer: interrupt fixup in the quirk

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Date:	Fri, 17 Jun 2016 03:30:56 +0000
From:	Po Liu <po.liu@....com>
To:	Bjorn Helgaas <helgaas@...nel.org>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Rob Herring <robh@...nel.org>, Roy Zang <roy.zang@....com>,
	Mingkai Hu <mingkai.hu@....com>,
	Stuart Yoder <stuart.yoder@....com>,
	Yang-Leo Li <leoyang.li@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Minghuan Lian <minghuan.lian@....com>,
	Murali Karicheri <m-karicheri2@...com>
Subject: RE: [PATCH v2 2/2] pci/aer: interrupt fixup in the quirk



>  -----Original Message-----
>  From: Bjorn Helgaas [mailto:helgaas@...nel.org]
>  Sent: Thursday, June 16, 2016 9:54 PM
>  To: Po Liu
>  Cc: linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
>  linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; Bjorn Helgaas;
>  Shawn Guo; Marc Zyngier; Rob Herring; Roy Zang; Mingkai Hu; Stuart Yoder;
>  Yang-Leo Li; Arnd Bergmann; Minghuan Lian; Murali Karicheri
>  Subject: Re: [PATCH v2 2/2] pci/aer: interrupt fixup in the quirk
>  
>  On Tue, Jun 14, 2016 at 02:12:27PM +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@....com>
>  > ---
>  > changes for V2:
>  > 	- Move to the quirk file
>  >
>  >  drivers/pci/quirks.c | 23 +++++++++++++++++++++++
>  >  1 file changed, 23 insertions(+)
>  >
>  > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index
>  > ee72ebe..909d479 100644
>  > --- a/drivers/pci/quirks.c
>  > +++ b/drivers/pci/quirks.c
>  
>  Is there any possibility of this part being used on different arches, or
>  will it only ever be on arm64 (or whatever it is)?  If the latter, it
>  could go somewhere like arch/arm64/kernel/quirks.c (which doesn't exist
>  yet).

NXP Layerscape1 is base on the arm 32bit design. Also need the fixup.

>  
>  > @@ -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 +4420,25 @@ 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;
>  > +	struct device_node *np = NULL;
>  > +
>  > +	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;
>  > +		}
>  > +	}
>  
>  What does this mean for the other PCIe services, e.g., PME?  I guess
>  this makes the existing AER code work unchanged.  But I thought PME had
>  a similar situation and was connected up to a different interrupt than
>  AER was.

Yes, PME is similar, HP is not support. I think better to disable the PME service irq in the quirk.
But seems it is no use because quirk fixup is only running in init phase time(except suspend, resume).

>  
>  > +}
>  > +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, PCI_ANY_ID,
>  > +quirk_aer_interrupt);
>  > --
>  > 2.1.0.27.g96db324
>  >
>  > --
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