s390/mm: add no-dat TLB flush optimization

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 37 insertions, 15 deletions

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 57057fb..c927138 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -952,15 +952,27 @@ static inline pte_t pte_mkhuge(pte_t pte)
 #define IPTE_GLOBAL	0
 #define	IPTE_LOCAL	1
 
-static inline void __ptep_ipte(unsigned long address, pte_t *ptep, int local)
+#define IPTE_NODAT	0x400
+
+static inline void __ptep_ipte(unsigned long address, pte_t *ptep,
+			       unsigned long opt, int local)
 {
 	unsigned long pto = (unsigned long) ptep;
 
-	/* Invalidation + TLB flush for the pte */
+	if (__builtin_constant_p(opt) && opt == 0) {
+		/* Invalidation + TLB flush for the pte */
+		asm volatile(
+			"	.insn	rrf,0xb2210000,%[r1],%[r2],0,%[m4]"
+			: "+m" (*ptep) : [r1] "a" (pto), [r2] "a" (address),
+			  [m4] "i" (local));
+		return;
+	}
+
+	/* Invalidate ptes with options + TLB flush of the ptes */
 	asm volatile(
-		"       .insn rrf,0xb2210000,%[r1],%[r2],0,%[m4]"
-		: "+m" (*ptep) : [r1] "a" (pto), [r2] "a" (address),
-		  [m4] "i" (local));
+		"	.insn	rrf,0xb2210000,%[r1],%[r2],%[r3],%[m4]"
+		: [r2] "+a" (address), [r3] "+a" (opt)
+		: [r1] "a" (pto), [m4] "i" (local) : "memory");
 }
 
 static inline void __ptep_ipte_range(unsigned long address, int nr,
@@ -1341,31 +1353,36 @@ static inline void __pmdp_csp(pmd_t *pmdp)
 #define IDTE_GLOBAL	0
 #define IDTE_LOCAL	1
 
-static inline void __pmdp_idte(unsigned long address, pmd_t *pmdp, int local)
+#define IDTE_PTOA	0x0800
+#define IDTE_NODAT	0x1000
+
+static inline void __pmdp_idte(unsigned long addr, pmd_t *pmdp,
+			       unsigned long opt, int local)
 {
 	unsigned long sto;
 
-	sto = (unsigned long) pmdp - pmd_index(address) * sizeof(pmd_t);
+	sto = (unsigned long) pmdp - pmd_index(addr) * sizeof(pmd_t);
 	asm volatile(
 		"	.insn	rrf,0xb98e0000,%[r1],%[r2],0,%[m4]"
 		: "+m" (*pmdp)
-		: [r1] "a" (sto), [r2] "a" ((address & HPAGE_MASK)),
+		: [r1] "a" (sto), [r2] "a" ((addr & HPAGE_MASK) | opt),
 		  [m4] "i" (local)
 		: "cc" );
 }
 
-static inline void __pudp_idte(unsigned long address, pud_t *pudp, int local)
+static inline void __pudp_idte(unsigned long addr, pud_t *pudp,
+			       unsigned long opt, int local)
 {
 	unsigned long r3o;
 
-	r3o = (unsigned long) pudp - pud_index(address) * sizeof(pud_t);
+	r3o = (unsigned long) pudp - pud_index(addr) * sizeof(pud_t);
 	r3o |= _ASCE_TYPE_REGION3;
 	asm volatile(
 		"	.insn	rrf,0xb98e0000,%[r1],%[r2],0,%[m4]"
 		: "+m" (*pudp)
-		: [r1] "a" (r3o), [r2] "a" ((address & PUD_MASK)),
+		: [r1] "a" (r3o), [r2] "a" ((addr & PUD_MASK) | opt),
 		  [m4] "i" (local)
-		: "cc");
+		: "cc" );
 }
 
 pmd_t pmdp_xchg_direct(struct mm_struct *, unsigned long, pmd_t *, pmd_t);
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 11e59ba..49c4259 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -29,8 +29,9 @@
 #define MACHINE_FLAG_TE		_BITUL(11)
 #define MACHINE_FLAG_TLB_LC	_BITUL(12)
 #define MACHINE_FLAG_VX		_BITUL(13)
-#define MACHINE_FLAG_NX		_BITUL(14)
-#define MACHINE_FLAG_GS		_BITUL(15)
+#define MACHINE_FLAG_TLB_GUEST	_BITUL(14)
+#define MACHINE_FLAG_NX		_BITUL(15)
+#define MACHINE_FLAG_GS		_BITUL(16)
 
 #define LPP_MAGIC		_BITUL(31)
 #define LPP_PFAULT_PID_MASK	_AC(0xffffffff, UL)
@@ -68,6 +69,7 @@ extern void detect_memory_memblock(void);
 #define MACHINE_HAS_TE		(S390_lowcore.machine_flags & MACHINE_FLAG_TE)
 #define MACHINE_HAS_TLB_LC	(S390_lowcore.machine_flags & MACHINE_FLAG_TLB_LC)
 #define MACHINE_HAS_VX		(S390_lowcore.machine_flags & MACHINE_FLAG_VX)
+#define MACHINE_HAS_TLB_GUEST	(S390_lowcore.machine_flags & MACHINE_FLAG_TLB_GUEST)
 #define MACHINE_HAS_NX		(S390_lowcore.machine_flags & MACHINE_FLAG_NX)
 #define MACHINE_HAS_GS		(S390_lowcore.machine_flags & MACHINE_FLAG_GS)
 
diff --git a/arch/s390/include/asm/tlbflush.h b/arch/s390/include/asm/tlbflush.h
index 3984610..38d82ed 100644
--- a/arch/s390/include/asm/tlbflush.h
+++ b/arch/s390/include/asm/tlbflush.h
@@ -20,10 +20,13 @@ static inline void __tlb_flush_local(void)
  */
 static inline void __tlb_flush_idte(unsigned long asce)
 {
+	unsigned long opt;
+
+	opt = IDTE_PTOA;
 	/* Global TLB flush for the mm */
 	asm volatile(
 		"	.insn	rrf,0xb98e0000,0,%0,%1,0"
-		: : "a" (2048), "a" (asce) : "cc");
+		: : "a" (opt), "a" (asce) : "cc");
 }
 
 #ifdef CONFIG_SMP