linux-kernel - Re: [PATCH 3/3] iommu/amd: Support multiple PCI DMA aliases in IRQ Remapping

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Date:   Tue, 15 Oct 2019 15:37:48 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Kit Chow <kchow@...aio.com>
Subject: Re: [PATCH 3/3] iommu/amd: Support multiple PCI DMA aliases in IRQ
 Remapping

On Tue, Oct 08, 2019 at 04:18:37PM -0600, Logan Gunthorpe wrote:
> -static struct irq_remap_table *alloc_irq_table(u16 devid)
> +static int set_remap_table_entry_alias(struct pci_dev *pdev, u16 alias,
> +				       void *data)
> +{
> +	struct irq_remap_table *table = data;
> +
> +	irq_lookup_table[alias] = table;
> +	set_dte_irq_entry(alias, table);
> +
> +	return 0;
> +}
> +
> +static int iommu_flush_dte_alias(struct pci_dev *pdev, u16 alias, void *data)
> +{
> +	struct amd_iommu *iommu = data;
> +
> +	iommu_flush_dte(iommu, alias);
> +
> +	return 0;
> +}

I think these two functions can be merged into one, saving one
pci_for_each_dma_alias() call below. You can lookup the iommu using the
amd_iommu_rlookup_table[alias] in the first function and issue the flush
there.


Regards,

	Joerg