On Sat, Sep 25, 2021 at 05:18:02PM +0300, Lennert Buytenhek wrote:
> +#define IS_IOMMU_MEM_TRANSACTION(flags) \
> + (((flags) & EVENT_FLAG_I) == 0)
> +
> +#define IS_WRITE_REQUEST(flags) \
> + ((flags) & EVENT_FLAG_RW)
> +
> static void amd_iommu_report_page_fault(u16 devid, u16 domain_id,
> u64 address, int flags)
> {
> @@ -484,6 +490,18 @@ static void amd_iommu_report_page_fault(u16 devid, u16
> domain_id,
> if (pdev)
> dev_data = dev_iommu_priv_get(&pdev->dev);
>
> + /*
> + * If this is a DMA fault (for which the I(nterrupt) bit will
> + * be unset), allow report_iommu_fault() to prevent logging it.
> + */
> + if (dev_data && IS_IOMMU_MEM_TRANSACTION(flags)) {
> + if (!report_iommu_fault(&dev_data->domain->domain,
> + &pdev->dev, address,
> + IS_WRITE_REQUEST(flags) ?
> + IOMMU_FAULT_WRITE : IOMMU_FAULT_READ))
> + goto out;
This is better placed inside the 'if (dev_data)' statement below.
Otherwise it looks good to me.
Regards,
Joerg
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