linux-kernel - [PATCH v2 12/17] powerpc/mm: Add hooks for cxl

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Message-Id: <1412073306-13812-13-git-send-email-mikey@neuling.org>
Date:	Tue, 30 Sep 2014 20:35:01 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	greg@...ah.com, arnd@...db.de, mpe@...erman.id.au,
	benh@...nel.crashing.org
Cc:	mikey@...ling.org, anton@...ba.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, jk@...abs.org, imunsie@...ibm.com,
	cbe-oss-dev@...ts.ozlabs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH v2 12/17] powerpc/mm: Add hooks for cxl

From: Ian Munsie <imunsie@....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@....ibm.com>
Signed-off-by: Michael Neuling <mikey@...ling.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 ba8bf8e..219dadb 100644
--- a/arch/powerpc/mm/copro_fault.c
+++ b/arch/powerpc/mm/copro_fault.c
@@ -25,6 +25,7 @@
 #include <linux/export.h>
 #include <asm/reg.h>
 #include <asm/spu.h>
+#include <misc/cxl.h>
 
 /*
  * This ought to be kept in sync with the powerpc specific do_page_fault
@@ -118,5 +119,6 @@ void copro_flush_all_slbs(struct mm_struct *mm)
 #ifdef CONFIG_SPU_BASE
 	spu_flush_all_slbs(mm);
 #endif
+	cxl_slbia(mm);
 }
 EXPORT_SYMBOL_GPL(copro_flush_all_slbs);
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)
 #else
@@ -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)
-- 
1.9.1

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