s390/mm: Remove cpu_has_idte()

Remove cpu_has_idte(). The IDTE instruction is part of the
Dat-Enhancement facility 1, which is always available.
Therefore remove the helper and now superfluous code.

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: hcahca

arch/s390/include/asm/cpufeature.h

@@ -27,7 +27,6 @@ int cpu_have_feature(unsigned int nr);
 #define cpu_has_edat1()		test_facility(8)
 #define cpu_has_edat2()		test_facility(78)
 #define cpu_has_gs()		test_facility(133)
-#define cpu_has_idte()		test_facility(3)
 #define cpu_has_nx()		test_facility(130)
 #define cpu_has_rdp()		test_facility(194)
 #define cpu_has_seq_insn()	test_facility(85)

arch/s390/include/asm/tlbflush.h

@@ -54,7 +54,7 @@ static inline void __tlb_flush_mm(struct mm_struct *mm)
 	cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask);
 	barrier();
 	gmap_asce = READ_ONCE(mm->context.gmap_asce);
-	if (cpu_has_idte() && gmap_asce != -1UL) {
+	if (gmap_asce != -1UL) {
 		if (gmap_asce)
 			__tlb_flush_idte(gmap_asce);
 		__tlb_flush_idte(mm->context.asce);
@@ -68,10 +68,7 @@ static inline void __tlb_flush_mm(struct mm_struct *mm)
 
 static inline void __tlb_flush_kernel(void)
 {
-	if (cpu_has_idte())
-		__tlb_flush_idte(init_mm.context.asce);
-	else
-		__tlb_flush_global();
+	__tlb_flush_idte(init_mm.context.asce);
 }
 
 static inline void __tlb_flush_mm_lazy(struct mm_struct * mm)

arch/s390/mm/gmap.c

@@ -138,10 +138,7 @@ EXPORT_SYMBOL_GPL(gmap_create);
 
 static void gmap_flush_tlb(struct gmap *gmap)
 {
-	if (cpu_has_idte())
-		__tlb_flush_idte(gmap->asce);
-	else
-		__tlb_flush_global();
+	__tlb_flush_idte(gmap->asce);
 }
 
 static void gmap_radix_tree_free(struct radix_tree_root *root)
@@ -1988,10 +1985,8 @@ static void gmap_pmdp_xchg(struct gmap *gmap, pmd_t *pmdp, pmd_t new,
 	if (machine_has_tlb_guest())
 		__pmdp_idte(gaddr, (pmd_t *)pmdp, IDTE_GUEST_ASCE, gmap->asce,
 			    IDTE_GLOBAL);
-	else if (cpu_has_idte())
-		__pmdp_idte(gaddr, (pmd_t *)pmdp, 0, 0, IDTE_GLOBAL);
 	else
-		__pmdp_csp(pmdp);
+		__pmdp_idte(gaddr, (pmd_t *)pmdp, 0, 0, IDTE_GLOBAL);
 	set_pmd(pmdp, new);
 }
 
@@ -2066,7 +2061,7 @@ void gmap_pmdp_idte_local(struct mm_struct *mm, unsigned long vmaddr)
 			if (machine_has_tlb_guest())
 				__pmdp_idte(gaddr, pmdp, IDTE_GUEST_ASCE,
 					    gmap->asce, IDTE_LOCAL);
-			else if (cpu_has_idte())
+			else
 				__pmdp_idte(gaddr, pmdp, 0, 0, IDTE_LOCAL);
 			*pmdp = __pmd(_SEGMENT_ENTRY_EMPTY);
 		}
@@ -2099,10 +2094,8 @@ void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr)
 			if (machine_has_tlb_guest())
 				__pmdp_idte(gaddr, pmdp, IDTE_GUEST_ASCE,
 					    gmap->asce, IDTE_GLOBAL);
-			else if (cpu_has_idte())
-				__pmdp_idte(gaddr, pmdp, 0, 0, IDTE_GLOBAL);
 			else
-				__pmdp_csp(pmdp);
+				__pmdp_idte(gaddr, pmdp, 0, 0, IDTE_GLOBAL);
 			*pmdp = __pmd(_SEGMENT_ENTRY_EMPTY);
 		}
 		spin_unlock(&gmap->guest_table_lock);

arch/s390/mm/pageattr.c

@@ -78,10 +78,8 @@ static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
 		}
 		table = (unsigned long *)((unsigned long)old & mask);
 		crdte(*old, new, table, dtt, addr, get_lowcore()->kernel_asce.val);
-	} else if (cpu_has_idte()) {
-		cspg(old, *old, new);
 	} else {
-		csp((unsigned int *)old + 1, *old, new);
+		cspg(old, *old, new);
 	}
 }
 

arch/s390/mm/pgtable.c

@@ -360,14 +360,10 @@ static inline void pmdp_idte_global(struct mm_struct *mm,
 			    mm->context.asce, IDTE_GLOBAL);
 		if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m)
 			gmap_pmdp_idte_global(mm, addr);
-	} else if (cpu_has_idte()) {
+	} else {
 		__pmdp_idte(addr, pmdp, 0, 0, IDTE_GLOBAL);
 		if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m)
 			gmap_pmdp_idte_global(mm, addr);
-	} else {
-		__pmdp_csp(pmdp);
-		if (mm_has_pgste(mm) && mm->context.allow_gmap_hpage_1m)
-			gmap_pmdp_csp(mm, addr);
 	}
 }
 
@@ -487,14 +483,8 @@ static inline void pudp_idte_global(struct mm_struct *mm,
 	if (machine_has_tlb_guest())
 		__pudp_idte(addr, pudp, IDTE_NODAT | IDTE_GUEST_ASCE,
 			    mm->context.asce, IDTE_GLOBAL);
-	else if (cpu_has_idte())
-		__pudp_idte(addr, pudp, 0, 0, IDTE_GLOBAL);
 	else
-		/*
-		 * Invalid bit position is the same for pmd and pud, so we can
-		 * reuse _pmd_csp() here
-		 */
-		__pmdp_csp((pmd_t *) pudp);
+		__pudp_idte(addr, pudp, 0, 0, IDTE_GLOBAL);
 }
 
 static inline pud_t pudp_flush_direct(struct mm_struct *mm,