On Wed, May 18, 2022 at 11:21:17AM -0700, Jacob Pan wrote:
> On VT-d platforms with scalable mode enabled, devices issue DMA requests
> with PASID need to attach PASIDs to given IOMMU domains. The attach
> operation involves the following:
> - Programming the PASID into the device's PASID table
> - Tracking device domain and the PASID relationship
> - Managing IOTLB and device TLB invalidations
>
> This patch add attach_dev_pasid functions to the default domain ops which
> is used by DMA and identity domain types. It could be extended to support
> other domain types whenever necessary.
>
> Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
> Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
> drivers/iommu/intel/iommu.c | 72 +++++++++++++++++++++++++++++++++++--
> 1 file changed, 70 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 1c2c92b657c7..75615c105fdf 100644
> +++ b/drivers/iommu/intel/iommu.c
> @@ -1556,12 +1556,18 @@ static void __iommu_flush_dev_iotlb(struct
> device_domain_info *info,
> u64 addr, unsigned int mask)
> {
> u16 sid, qdep;
> + ioasid_t pasid;
>
> if (!info || !info->ats_enabled)
> return;
>
> sid = info->bus << 8 | info->devfn;
> qdep = info->ats_qdep;
> + pasid = iommu_get_pasid_from_domain(info->dev, &info->domain->domain);
No, a simgple domain can be attached to multiple pasids, all need to
be flushed.
This whole API isn't suitable.
Jason
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