[PATCH v3 11/16] powerpc/mm: Add hooks for cxl

Michael Neuling mikey at neuling.org
Tue Oct 7 21:48:17 EST 2014

From: Ian Munsie <imunsie at au1.ibm.com>

This add a hook into tlbie() so that we use global invalidations when there are
cxl contexts active.

Normally cxl snoops broadcast tlbie. cxl can have TLB entries invalidated via
MMIO, but we aren't doing that yet. So for now we are just disabling local
tlbies when cxl contexts are active. In future we can make tlbie() local mode
smarter so that it invalidates cxl contexts explicitly when it needs to.

This also adds a hooks for when SLBs are invalidated to ensure any
corresponding SLBs in cxl are also invalidated at the same time.

Signed-off-by: Ian Munsie <imunsie at au1.ibm.com>
Signed-off-by: Michael Neuling <mikey at neuling.org>
 arch/powerpc/mm/copro_fault.c    | 2 ++
 arch/powerpc/mm/hash_native_64.c | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/copro_fault.c b/arch/powerpc/mm/copro_fault.c
index 222ef9b..55791fc 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -26,6 +26,7 @@
 #include <asm/reg.h>
 #include <asm/copro.h>
 #include <asm/spu.h>
+#include <misc/cxl.h>
  * This ought to be kept in sync with the powerpc specific do_page_fault
@@ -143,5 +144,6 @@ void copro_flush_all_slbs(struct mm_struct *mm)
+	cxl_slbia(mm);
diff --git a/arch/powerpc/mm/hash_native_64.c b/arch/powerpc/mm/hash_native_64.c
index afc0a82..ae4962a 100644
--- a/arch/powerpc/mm/hash_native_64.c
+++ b/arch/powerpc/mm/hash_native_64.c
@@ -29,6 +29,8 @@
 #include <asm/kexec.h>
 #include <asm/ppc-opcode.h>
+#include <misc/cxl.h>
 #ifdef DEBUG_LOW
 #define DBG_LOW(fmt...) udbg_printf(fmt)
@@ -149,9 +151,11 @@ static inline void __tlbiel(unsigned long vpn, int psize, int apsize, int ssize)
 static inline void tlbie(unsigned long vpn, int psize, int apsize,
 			 int ssize, int local)
-	unsigned int use_local = local && mmu_has_feature(MMU_FTR_TLBIEL);
+	unsigned int use_local;
 	int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
+	use_local = local && mmu_has_feature(MMU_FTR_TLBIEL) && !cxl_ctx_in_use();
 	if (use_local)
 		use_local = mmu_psize_defs[psize].tlbiel;
 	if (lock_tlbie && !use_local)

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