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

2020-07-16 Thread 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

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

2020-07-15 Thread Michael Ellerman
Haren Myneni writes: > 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 n

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

2020-07-10 Thread Haren Myneni
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 addres