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authorAlistair Popple <alistair@popple.id.au>2017-04-03 19:51:44 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2017-04-04 13:27:26 +1000
commit1ab66d1fbadad86b1f4a9c7857e193af0ee0022c (patch)
tree0416486fa6ef85c67e1f679b5df5a110ef68b734 /arch/powerpc/mm
parent4c3b89effc281704d5395282c800c45e453235f6 (diff)
powerpc/powernv: Introduce address translation services for Nvlink2
Nvlink2 supports address translation services (ATS) allowing devices to request address translations from an mmu known as the nest MMU which is setup to walk the CPU page tables. To access this functionality certain firmware calls are required to setup and manage hardware context tables in the nvlink processing unit (NPU). The NPU also manages forwarding of TLB invalidates (known as address translation shootdowns/ATSDs) to attached devices. This patch exports several methods to allow device drivers to register a process id (PASID/PID) in the hardware tables and to receive notification of when a device should stop issuing address translation requests (ATRs). It also adds a fault handler to allow device drivers to demand fault pages in. Signed-off-by: Alistair Popple <alistair@popple.id.au> [mpe: Fix up comment formatting, use flush_tlb_mm()] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/mmu_context_book3s64.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
index 86719f6b5a7c..c6dca2ae78ef 100644
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -138,6 +138,8 @@ static int radix__init_new_context(struct mm_struct *mm)
rts_field = radix__get_tree_size();
process_tb[index].prtb0 = cpu_to_be64(rts_field | __pa(mm->pgd) | RADIX_PGD_INDEX_SIZE);
+ mm->context.npu_context = NULL;
+
return index;
}