RE: [PATCH 3/3] PCI: Xilinx NWL PCIe: Fix Error for multi function device for legacy interrupts.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> Hi Bharat,
> > @@ -561,7 +561,7 @@ static int nwl_pcie_init_irq_domain(struct nwl_pcie
> *pcie)
> >     }
> >
> >     pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node,
> > -                                                   INTX_NUM,
> > +                                                   INTX_NUM + 1,
> >                                                     &legacy_domain_ops,
> >                                                     pcie);
>
> This feels like the wrong thing to do. You have INTX_NUM irqs, so the domain
> allocation should reflect this. On the other hand, the way the driver currently
> deals with mappings is quite broken (consistently adding 1 to the HW interrupt).
>
Hi Marc,

Without above change I get following crash in kernel while booting.

[    2.441684] error: hwirq 0x4 is too large for dummy

[    2.441694] ------------[ cut here ]------------

[    2.441698] WARNING: at kernel/irq/irqdomain.c:344

[    2.441702] Modules linked in:

[    2.441706]

[    2.441714] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.4.0 #8

[    2.441718] Hardware name: xlnx,zynqmp (DT)

[    2.441723] task: ffffffc071886b80 ti: ffffffc071888000 task.ti: ffffffc071888000

[    2.441732] PC is at irq_domain_associate+0x138/0x1c0

[    2.441738] LR is at irq_domain_associate+0x138/0x1c0

In kernel/irq/irqdomain.c function irq_domain_associate

if (WARN(hwirq >= domain->hwirq_max,
                 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
                return -EINVAL;

Here the hwirq and hwirq_max are equal to 4 without the above condition (INTX_NUM + 1) due to which crash is coming.
This is happening as the legacy interrupts are starting from 1 (INTA).

And I'm  consistently adding 1 to the HW interrupt as in nwl_pcie_leg_handler I get 0th bit set from MSGF_LEG_STATUS
if INTA interrupt is raised but my hwirq number being mapped for INTA is 0x1 so that's I'm adding 1 to obtain correct virtual irq.
Same case in nwl_pcie_free_irq_domain since hwirq starts from one I'm adding 1 to obtain virtual irq and free it.

Thanks & Regards,
Bharat


This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.

--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [DMA Engine]     [Linux Coverity]     [Linux USB]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Greybus]

  Powered by Linux