linux-kernel - Re: [PATCH 02/17] pcie-xilinx: add missing 5th legacy interrupt

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Date:   Wed, 7 Jun 2017 10:24:59 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Palmer Dabbelt <palmer@...belt.com>, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        olof@...om.net
Cc:     albert@...ive.com, patches@...ups.riscv.org,
        "Wesley W. Terpstra" <wesley@...ive.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 02/17] pcie-xilinx: add missing 5th legacy interrupt

+ Bjorn

On 06/06/17 23:59, Palmer Dabbelt wrote:
> From: "Wesley W. Terpstra" <wesley@...ive.com>
> 
> These are numbered from 1.
> 
> Signed-off-by: Palmer Dabbelt <palmer@...belt.com>
> ---
>  drivers/pci/host/pcie-xilinx.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c
> index 2fe2df51f9f8..8804145d399a 100644
> --- a/drivers/pci/host/pcie-xilinx.c
> +++ b/drivers/pci/host/pcie-xilinx.c
> @@ -443,7 +443,7 @@ static irqreturn_t xilinx_pcie_intr_handler(int irq, void *data)
>  			val = ((val & XILINX_PCIE_RPIFR1_INTR_MASK) >>
>  				XILINX_PCIE_RPIFR1_INTR_SHIFT) + 1;
>  			generic_handle_irq(irq_find_mapping(port->leg_domain,
> -							    val));
> +							    val + 1));
>  		}
>  	}
>  
> @@ -524,7 +524,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
>  		return -ENODEV;
>  	}
>  
> -	port->leg_domain = irq_domain_add_linear(pcie_intc_node, 4,
> +	port->leg_domain = irq_domain_add_linear(pcie_intc_node, 5,
>  						 &intx_domain_ops,
>  						 port);
>  	if (!port->leg_domain) {
> 

This is a common problem with the current OF code that numbers INTx from
1 instead of zero (there is no 5th legacy interrupts in the PCI spec,
despite what $SUBJECT says). I'd be inclined to fix this at the core
level rather than papering over it in the various drivers...

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...