Messages in this thread | | | From | "Aneesh Kumar K.V" <> | Subject | Re: [PATCH v2 02/17] powerpc/cell: Move data segment faulting code out of cell platform | Date | Wed, 01 Oct 2014 15:15:40 +0530 |
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Michael Neuling <mikey@neuling.org> writes:
> From: Ian Munsie <imunsie@au1.ibm.com> > > __spu_trap_data_seg() currently contains code to determine the VSID and ESID > required for a particular EA and mm struct. > > This code is generically useful for other co-processors. This moves the code > of the cell platform so it can be used by other powerpc code. It also adds 1TB > segment handling which Cell didn't have. > > Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> > Signed-off-by: Michael Neuling <mikey@neuling.org> > --- > arch/powerpc/include/asm/mmu-hash64.h | 7 ++++- > arch/powerpc/mm/copro_fault.c | 48 ++++++++++++++++++++++++++++++++++ > arch/powerpc/mm/slb.c | 3 --- > arch/powerpc/platforms/cell/spu_base.c | 41 +++-------------------------- > 4 files changed, 58 insertions(+), 41 deletions(-) > > diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h > index d765144..6d0b7a2 100644 > --- a/arch/powerpc/include/asm/mmu-hash64.h > +++ b/arch/powerpc/include/asm/mmu-hash64.h > @@ -189,7 +189,12 @@ static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize) > #define LP_MASK(i) ((0xFF >> (i)) << LP_SHIFT) > > #ifndef __ASSEMBLY__ > - > +static inline int slb_vsid_shift(int ssize) > +{ > + if (ssize == MMU_SEGSIZE_256M) > + return SLB_VSID_SHIFT; > + return SLB_VSID_SHIFT_1T; > +} > static inline int segment_shift(int ssize) > { > if (ssize == MMU_SEGSIZE_256M) > diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c > index ba7df14..b865697 100644 > --- a/arch/powerpc/mm/copro_fault.c > +++ b/arch/powerpc/mm/copro_fault.c > @@ -90,3 +90,51 @@ out_unlock: > return ret; > } > EXPORT_SYMBOL_GPL(copro_handle_mm_fault); > + > +int copro_data_segment(struct mm_struct *mm, u64 ea, u64 *esid, u64 *vsid) > +{ > + int psize, ssize; > + > + *esid = (ea & ESID_MASK) | SLB_ESID_V; > + > + switch (REGION_ID(ea)) { > + case USER_REGION_ID: > + pr_devel("copro_data_segment: 0x%llx -- USER_REGION_ID\n", ea); > +#ifdef CONFIG_PPC_MM_SLICES > + psize = get_slice_psize(mm, ea); > +#else > + psize = mm->context.user_psize; > +#endif
We don't really need that as explained in last review.
-aneesh
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