[PATCH V2 1/2] powerpc/vas: Report proper error code for address translation failure

[Michael Ellerman]

On Fri, 10 Jul 2020 16:47:19 -0700, Haren Myneni wrote:
> P9 DD2 NX workbook (Table 4-36) says DMA controller uses CC=5
> internally for translation fault handling. NX reserves CC=250 for
> OS to notify user space when NX encounters address translation
> failure on the request buffer. Not an issue in earlier releases
> as NX does not get faults on kernel addresses.
> 
> This patch defines CSB_CC_FAULT_ADDRESS(250) and updates CSB.CC with
> this proper error code for user space.
> 
> [...]

Applied to powerpc/fixes.

[1/2] powerpc/vas: Report proper error code for address translation failure
      https://git.kernel.org/powerpc/c/6068e1a4427e88f5cc62f238d1baf94a8b824ef4
[2/2] selftests/powerpc: Use proper error code to check fault address
      https://git.kernel.org/powerpc/c/f0479c4bcbd92d1a457d4a43bcab79f29d11334a

cheers