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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2018-03-23 09:29:05 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2018-03-23 14:14:31 +1100
commitaff6f8cb3e2170b9e58b0932bce7bfb492775e23 (patch)
tree70b8f5db0da67c2a359166e793539dc1bdd9cdbd /arch/powerpc/mm
parentff6781fd1bb404d8a551c02c35c70cec1da17ff1 (diff)
powerpc/mm: Add tracking of the number of coprocessors using a context
Currently, when using coprocessors (which use the Nest MMU), we simply increment the active_cpu count to force all TLB invalidations to be come broadcast. Unfortunately, due to an errata in POWER9, we will need to know more specifically that coprocessors are in use. This maintains a separate copros counter in the MMU context for that purpose. NB. The commit mentioned in the fixes tag below is not at fault for the bug we're fixing in this commit and the next, but this fix applies on top the infrastructure it introduced. Fixes: 03b8abedf4f4 ("cxl: Enable global TLBIs for cxl contexts") Cc: stable@vger.kernel.org # v4.15+ Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Tested-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm')
-rw-r--r--arch/powerpc/mm/mmu_context_book3s64.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mmu_context_book3s64.c b/arch/powerpc/mm/mmu_context_book3s64.c
index 929d9ef7083f..3f980baade4c 100644
--- a/arch/powerpc/mm/mmu_context_book3s64.c
+++ b/arch/powerpc/mm/mmu_context_book3s64.c
@@ -173,6 +173,7 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
mm_iommu_init(mm);
#endif
atomic_set(&mm->context.active_cpus, 0);
+ atomic_set(&mm->context.copros, 0);
return 0;
}