Messages in this thread Patch in this message | | | Subject | Re: [PATCH v3 2/2] pci/aer: interrupt fixup in the quirk | From | Dongdong Liu <> | Date | Mon, 4 Jul 2016 16:44:20 +0800 |
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Hi Po
I found a problem with the similar patch. as the below log.
[ 4.287060] pci 0000:80:00.0: quirk_aer_interrupt dev->irq 416 [ 4.293778] pcieport 0000:80:00.0: pci_device_probe in [ 4.299605] pcieport 0000:80:00.0: of_irq_parse_pci() failed with rc=-22 [ 4.307209] pcieport 0000:80:00.0: init_service_irqs dev->irq 0
The fucntions are called as below sequence. 1. quirk_aer_interrupt, get the aer dev->irq 416. 2. pci_device_probe->of_irq_parse_pci, of_irq_parse_pci() failed, then dev->irq changed to 0.
So this patch could not work with aer.
Thanks Dongdong 在 2016/6/14 16:24, Po Liu 写道: > 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> > --- > 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); >
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