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Subject: Re: [PATCH 3/3] PCI: iproc: Set affinity mask on MSI interrupts
To:     Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>,
        bhelgaas@google.com, rjui@broadcom.com, sbranden@broadcom.com,
        f.fainelli@gmail.com
Cc:     linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20200730033747.18931-1-mark.tomlinson@alliedtelesis.co.nz>
 <20200730033747.18931-3-mark.tomlinson@alliedtelesis.co.nz>
From:   Scott Branden <scott.branden@broadcom.com>
Message-ID: <0aa1e61f-4c9c-521e-2652-74942ccda970@broadcom.com>
Date:   Thu, 30 Jul 2020 10:07:52 -0700
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On 2020-07-29 8:37 p.m., Mark Tomlinson wrote:
> The core interrupt code expects the irq_set_affinity call to update the
> effective affinity for the interrupt. This was not being done, so update
> iproc_msi_irq_set_affinity() to do so.
>
> Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
Should this have a Fixes: added to it?
> ---
>  drivers/pci/controller/pcie-iproc-msi.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-iproc-msi.c b/drivers/pci/controller/pcie-iproc-msi.c
> index 3176ad3ab0e5..908475d27e0e 100644
> --- a/drivers/pci/controller/pcie-iproc-msi.c
> +++ b/drivers/pci/controller/pcie-iproc-msi.c
> @@ -209,15 +209,20 @@ static int iproc_msi_irq_set_affinity(struct irq_data *data,
>  	struct iproc_msi *msi = irq_data_get_irq_chip_data(data);
>  	int target_cpu = cpumask_first(mask);
>  	int curr_cpu;
> +	int ret;
>  
>  	curr_cpu = hwirq_to_cpu(msi, data->hwirq);
>  	if (curr_cpu == target_cpu)
> -		return IRQ_SET_MASK_OK_DONE;
> +		ret = IRQ_SET_MASK_OK_DONE;
> +	else {
> +		/* steer MSI to the target CPU */
> +		data->hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq) + target_cpu;
> +		ret = IRQ_SET_MASK_OK;
> +	}
>  
> -	/* steer MSI to the target CPU */
> -	data->hwirq = hwirq_to_canonical_hwirq(msi, data->hwirq) + target_cpu;
> +	irq_data_update_effective_affinity(data, cpumask_of(target_cpu));
>  
> -	return IRQ_SET_MASK_OK;
> +	return ret;
>  }
>  
>  static void iproc_msi_irq_compose_msi_msg(struct irq_data *data,