linux-kernel - Re: [PATCH v3 6/7] irqchip/gic-v3-mbi: Don't map the MSI page in mbi_compose_m{b, s}i

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Date:   Fri, 3 May 2019 15:27:51 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Julien Grall <julien.grall@....com>, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org
Cc:     logang@...tatee.com, douliyangs@...il.com,
        miquel.raynal@...tlin.com, jason@...edaemon.net,
        tglx@...utronix.de, joro@...tes.org, robin.murphy@....com,
        bigeasy@...utronix.de, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH v3 6/7] irqchip/gic-v3-mbi: Don't map the MSI page in
 mbi_compose_m{b, s}i_msg()

On 01/05/2019 14:58, Julien Grall wrote:
> The functions mbi_compose_m{b, s}i_msg may be called from non-preemptible
> context. However, on RT, iommu_dma_map_msi_msg() requires to be called
> from a preemptible context.
> 
> A recent patch split iommu_dma_map_msi_msg in two new functions:
> one that should be called in preemptible context, the other does
> not have any requirement.
> 
> The GICv3 MSI driver is reworked to avoid executing preemptible code in
> non-preemptible context. This can be achieved by preparing the two MSI
> mappings when allocating the MSI interrupt.
> 
> Signed-off-by: Julien Grall <julien.grall@....com>
> 
> ---
>     Changes in v2:
>         - Rework the commit message to use imperative mood
> ---
>  drivers/irqchip/irq-gic-v3-mbi.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-mbi.c b/drivers/irqchip/irq-gic-v3-mbi.c
> index fbfa7ff6deb1..d50f6cdf043c 100644
> --- a/drivers/irqchip/irq-gic-v3-mbi.c
> +++ b/drivers/irqchip/irq-gic-v3-mbi.c
> @@ -84,6 +84,7 @@ static void mbi_free_msi(struct mbi_range *mbi, unsigned int hwirq,
>  static int mbi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
>  				   unsigned int nr_irqs, void *args)
>  {
> +	msi_alloc_info_t *info = args;
>  	struct mbi_range *mbi = NULL;
>  	int hwirq, offset, i, err = 0;
>  
> @@ -104,6 +105,16 @@ static int mbi_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
>  
>  	hwirq = mbi->spi_start + offset;
>  
> +	err = iommu_dma_prepare_msi(info->desc,
> +				    mbi_phys_base + GICD_CLRSPI_NSR);
> +	if (err)
> +		return err;
> +
> +	err = iommu_dma_prepare_msi(info->desc,
> +				    mbi_phys_base + GICD_SETSPI_NSR);
> +	if (err)
> +		return err;

Nit here: The two registers are guaranteed to be in the same 4k page
(respectively offsets 0x48 and 0x40), so the second call is at best
useless. I'll fix it when applying it, no need to resend.

Thanks,

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