> Under certain circumstances, an IOTLB flush never completes and the hardware
> just locks up. The fix is meant to idle the GPU both before and after
> any unmap occurs, which should prevent the possibity to hang.
One comment below, noticed by building it for RHEL6.
>
> +/* Certain Gen5 chipsets require require idling the GPU before
> + * unmapping anything from the GTT when VT-d is enabled.
> + */
> +static inline int needs_idle_maps(void)
> +{
> + u16 gmch_ctrl;
> + const unsigned short gpu_devid = intel_private.pcidev->device;
> + bool needs_dmar = USE_PCI_DMA_API;
^^ you don't use needs_dmar anywhere.
Dave.
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