Joerg Roedel wrote: >On Wed, Mar 05, 2014 at 06:54:18PM -0600, [email protected] wrote: >> From: Suravee Suthikulpanit <[email protected]> >> >> In reality, the spec can only support 16-bit PASID since >> INVALIDATE_IOTLB_PAGES and COMPLETE_PPR_REQUEST commands only allow >> 16-bit PASID. So, we updated the PASID_MASK accordingly and invoke >>BUG_ON if the hardware is reporting PASmax more than 16-bit. >> >>Besides, max PASID is defined as ((2^(PASmax+1)) - 1). The current >> does not determine this correctly. >> >> Signed-off-by: Suravee Suthikulpanit <[email protected]> >> Tested-by: Jay Cornwall <[email protected]> > > Applied, thanks. > > Btw, is there any publicly available driver/way/whatever for me to test the > AMD IOMMUv2 code paths?
We are testing on a kernel development branch which enables ATS translation from shaders on the Kaveri APU. See drivers/gpu/hsa/radeon at http://cgit.freedesktop.org/~gabbayo/linux/ for the kernel driver. Testing requires some setup in user mode to construct a PM4 command stream and CIK assembly, similar to the DRM/Mesa UMD implementation. Even then, it is not possible to observe translations directly. Our testing is limited to indirect observations; e.g. modifying VA:PA mappings and ensuring shader loads/stores reflect expected results. I don't know of a way to exercise the IOMMUv2 code paths without an IOTLB client. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
