Am 01.03.2018 um 07:52 schrieb Lu Baolu:
Hi Jean,
On 02/13/2018 02:33 AM, Jean-Philippe Brucker wrote:
[SNIP]
+ pasid = idr_alloc_cyclic(&iommu_pasid_idr, io_mm, dev_param->min_pasid,
+ dev_param->max_pasid + 1, GFP_ATOMIC);
Can the pasid management code be moved into a common library?
PASID is not stick to SVA. An IOMMU model device could be designed
to use PASID for second level translation (classical DMA translation)
as well.
Yeah, we have the same problem on amdgpu.
We assign PASIDs to clients even when IOMMU isn't present in the system
just because we need it for debugging.
E.g. when the hardware detects that some shader program is doing
something nasty we get the PASID in the interrupt and could for example
use it to inform the client about the fault.
Regards,
Christian.
Best regards,
Lu Baolu
