arm64: Rename arm64-internal cache maintenance functions

Although naming across the codebase isn't that consistent, it
tends to follow certain patterns. Moreover, the term "flush"
isn't defined in the Arm Architecture reference manual, and might
be interpreted to mean clean, invalidate, or both for a cache.

Rename arm64-internal functions to make the naming internally
consistent, as well as making it consistent with the Arm ARM, by
specifying whether it applies to the instruction, data, or both
caches, whether the operation is a clean, invalidate, or both.
Also specify which point the operation applies to, i.e., to the
point of unification (PoU), coherency (PoC), or persistence
(PoP).

This commit applies the following sed transformation to all files
under arch/arm64:

"s/\b__flush_cache_range\b/caches_clean_inval_pou_macro/g;"\
"s/\b__flush_icache_range\b/caches_clean_inval_pou/g;"\
"s/\binvalidate_icache_range\b/icache_inval_pou/g;"\
"s/\b__flush_dcache_area\b/dcache_clean_inval_poc/g;"\
"s/\b__inval_dcache_area\b/dcache_inval_poc/g;"\
"s/__clean_dcache_area_poc\b/dcache_clean_poc/g;"\
"s/\b__clean_dcache_area_pop\b/dcache_clean_pop/g;"\
"s/\b__clean_dcache_area_pou\b/dcache_clean_pou/g;"\
"s/\b__flush_cache_user_range\b/caches_clean_inval_user_pou/g;"\
"s/\b__flush_icache_all\b/icache_inval_all_pou/g;"

Note that __clean_dcache_area_poc is deliberately missing a word
boundary check at the beginning in order to match the efistub
symbols in image-vars.h.

Also note that, despite its name, __flush_icache_range operates
on both instruction and data caches. The name change here
reflects that.

No functional change intended.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20210524083001.2586635-19-tabba@google.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: Fuad Tabba

arch/arm64/include/asm/arch_gicv3.h

@@ -125,7 +125,7 @@ static inline u32 gic_read_rpr(void)
 #define gic_write_lpir(v, c)		writeq_relaxed(v, c)
 
 #define gic_flush_dcache_to_poc(a,l)	\
-	__flush_dcache_area((unsigned long)(a), (unsigned long)(a)+(l))
+	dcache_clean_inval_poc((unsigned long)(a), (unsigned long)(a)+(l))
 
 #define gits_read_baser(c)		readq_relaxed(c)
 #define gits_write_baser(v, c)		writeq_relaxed(v, c)

arch/arm64/include/asm/cacheflush.h

@@ -34,54 +34,54 @@
  *		- start  - virtual start address (inclusive)
  *		- end    - virtual end address (exclusive)
  *
- *	__flush_icache_range(start, end)
+ *	caches_clean_inval_pou(start, end)
  *
  *		Ensure coherency between the I-cache and the D-cache region to
  *		the Point of Unification.
  *
- *	__flush_cache_user_range(start, end)
+ *	caches_clean_inval_user_pou(start, end)
  *
  *		Ensure coherency between the I-cache and the D-cache region to
  *		the Point of Unification.
  *		Use only if the region might access user memory.
  *
- *	invalidate_icache_range(start, end)
+ *	icache_inval_pou(start, end)
  *
  *		Invalidate I-cache region to the Point of Unification.
  *
- *	__flush_dcache_area(start, end)
+ *	dcache_clean_inval_poc(start, end)
  *
  *		Clean and invalidate D-cache region to the Point of Coherency.
  *
- *	__inval_dcache_area(start, end)
+ *	dcache_inval_poc(start, end)
  *
  *		Invalidate D-cache region to the Point of Coherency.
  *
- *	__clean_dcache_area_poc(start, end)
+ *	dcache_clean_poc(start, end)
  *
  *		Clean D-cache region to the Point of Coherency.
  *
- *	__clean_dcache_area_pop(start, end)
+ *	dcache_clean_pop(start, end)
  *
  *		Clean D-cache region to the Point of Persistence.
  *
- *	__clean_dcache_area_pou(start, end)
+ *	dcache_clean_pou(start, end)
  *
  *		Clean D-cache region to the Point of Unification.
  */
-extern void __flush_icache_range(unsigned long start, unsigned long end);
-extern void invalidate_icache_range(unsigned long start, unsigned long end);
-extern void __flush_dcache_area(unsigned long start, unsigned long end);
-extern void __inval_dcache_area(unsigned long start, unsigned long end);
-extern void __clean_dcache_area_poc(unsigned long start, unsigned long end);
-extern void __clean_dcache_area_pop(unsigned long start, unsigned long end);
-extern void __clean_dcache_area_pou(unsigned long start, unsigned long end);
-extern long __flush_cache_user_range(unsigned long start, unsigned long end);
+extern void caches_clean_inval_pou(unsigned long start, unsigned long end);
+extern void icache_inval_pou(unsigned long start, unsigned long end);
+extern void dcache_clean_inval_poc(unsigned long start, unsigned long end);
+extern void dcache_inval_poc(unsigned long start, unsigned long end);
+extern void dcache_clean_poc(unsigned long start, unsigned long end);
+extern void dcache_clean_pop(unsigned long start, unsigned long end);
+extern void dcache_clean_pou(unsigned long start, unsigned long end);
+extern long caches_clean_inval_user_pou(unsigned long start, unsigned long end);
 extern void sync_icache_aliases(unsigned long start, unsigned long end);
 
 static inline void flush_icache_range(unsigned long start, unsigned long end)
 {
-	__flush_icache_range(start, end);
+	caches_clean_inval_pou(start, end);
 
 	/*
 	 * IPI all online CPUs so that they undergo a context synchronization
@@ -135,7 +135,7 @@ extern void copy_to_user_page(struct vm_area_struct *, struct page *,
 #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
 extern void flush_dcache_page(struct page *);
 
-static __always_inline void __flush_icache_all(void)
+static __always_inline void icache_inval_all_pou(void)
 {
 	if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC))
 		return;

arch/arm64/include/asm/efi.h

@@ -137,7 +137,7 @@ void efi_virtmap_unload(void);
 
 static inline void efi_capsule_flush_cache_range(void *addr, int size)
 {
-	__flush_dcache_area((unsigned long)addr, (unsigned long)addr + size);
+	dcache_clean_inval_poc((unsigned long)addr, (unsigned long)addr + size);
 }
 
 #endif /* _ASM_EFI_H */

arch/arm64/include/asm/kvm_mmu.h

@@ -181,7 +181,7 @@ static inline void *__kvm_vector_slot2addr(void *base,
 struct kvm;
 
 #define kvm_flush_dcache_to_poc(a,l)	\
-	__flush_dcache_area((unsigned long)(a), (unsigned long)(a)+(l))
+	dcache_clean_inval_poc((unsigned long)(a), (unsigned long)(a)+(l))
 
 static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
 {
@@ -209,12 +209,12 @@ static inline void __invalidate_icache_guest_page(kvm_pfn_t pfn,
 {
 	if (icache_is_aliasing()) {
 		/* any kind of VIPT cache */
-		__flush_icache_all();
+		icache_inval_all_pou();
 	} else if (is_kernel_in_hyp_mode() || !icache_is_vpipt()) {
 		/* PIPT or VPIPT at EL2 (see comment in __kvm_tlb_flush_vmid_ipa) */
 		void *va = page_address(pfn_to_page(pfn));
 
-		invalidate_icache_range((unsigned long)va,
+		icache_inval_pou((unsigned long)va,
 					(unsigned long)va + size);
 	}
 }

arch/arm64/kernel/alternative.c

@@ -181,7 +181,7 @@ static void __nocfi __apply_alternatives(struct alt_region *region, bool is_modu
 	 */
 	if (!is_module) {
 		dsb(ish);
-		__flush_icache_all();
+		icache_inval_all_pou();
 		isb();
 
 		/* Ignore ARM64_CB bit from feature mask */

arch/arm64/kernel/efi-entry.S

@@ -29,7 +29,7 @@ SYM_CODE_START(efi_enter_kernel)
 	 */
 	ldr	w1, =kernel_size
 	add	x1, x0, x1
-	bl	__clean_dcache_area_poc
+	bl	dcache_clean_poc
 	ic	ialluis
 
 	/*
@@ -38,7 +38,7 @@ SYM_CODE_START(efi_enter_kernel)
 	 */
 	adr	x0, 0f
 	adr	x1, 3f
-	bl	__clean_dcache_area_poc
+	bl	dcache_clean_poc
 0:
 	/* Turn off Dcache and MMU */
 	mrs	x0, CurrentEL

arch/arm64/kernel/head.S

@@ -118,7 +118,7 @@ SYM_CODE_START_LOCAL(preserve_boot_args)
 						// MMU off
 
 	add	x1, x0, #0x20			// 4 x 8 bytes
-	b	__inval_dcache_area		// tail call
+	b	dcache_inval_poc		// tail call
 SYM_CODE_END(preserve_boot_args)
 
 /*
@@ -268,7 +268,7 @@ SYM_FUNC_START_LOCAL(__create_page_tables)
 	 */
 	adrp	x0, init_pg_dir
 	adrp	x1, init_pg_end
-	bl	__inval_dcache_area
+	bl	dcache_inval_poc
 
 	/*
 	 * Clear the init page tables.
@@ -381,11 +381,11 @@ SYM_FUNC_START_LOCAL(__create_page_tables)
 
 	adrp	x0, idmap_pg_dir
 	adrp	x1, idmap_pg_end
-	bl	__inval_dcache_area
+	bl	dcache_inval_poc
 
 	adrp	x0, init_pg_dir
 	adrp	x1, init_pg_end
-	bl	__inval_dcache_area
+	bl	dcache_inval_poc
 
 	ret	x28
 SYM_FUNC_END(__create_page_tables)

arch/arm64/kernel/hibernate-asm.S

@@ -45,7 +45,7 @@
  * Because this code has to be copied to a 'safe' page, it can't call out to
  * other functions by PC-relative address. Also remember that it may be
  * mid-way through over-writing other functions. For this reason it contains
- * code from __flush_icache_range() and uses the copy_page() macro.
+ * code from caches_clean_inval_pou() and uses the copy_page() macro.
  *
  * This 'safe' page is mapped via ttbr0, and executed from there. This function
  * switches to a copy of the linear map in ttbr1, performs the restore, then
@@ -87,7 +87,7 @@ SYM_CODE_START(swsusp_arch_suspend_exit)
 	copy_page	x0, x1, x2, x3, x4, x5, x6, x7, x8, x9
 
 	add	x1, x10, #PAGE_SIZE
-	/* Clean the copied page to PoU - based on __flush_icache_range() */
+	/* Clean the copied page to PoU - based on caches_clean_inval_pou() */
 	raw_dcache_line_size x2, x3
 	sub	x3, x2, #1
 	bic	x4, x10, x3

arch/arm64/kernel/hibernate.c

@@ -210,7 +210,7 @@ static int create_safe_exec_page(void *src_start, size_t length,
 		return -ENOMEM;
 
 	memcpy(page, src_start, length);
-	__flush_icache_range((unsigned long)page, (unsigned long)page + length);
+	caches_clean_inval_pou((unsigned long)page, (unsigned long)page + length);
 	rc = trans_pgd_idmap_page(&trans_info, &trans_ttbr0, &t0sz, page);
 	if (rc)
 		return rc;
@@ -381,17 +381,17 @@ int swsusp_arch_suspend(void)
 		ret = swsusp_save();
 	} else {
 		/* Clean kernel core startup/idle code to PoC*/
-		__flush_dcache_area((unsigned long)__mmuoff_data_start,
+		dcache_clean_inval_poc((unsigned long)__mmuoff_data_start,
 				    (unsigned long)__mmuoff_data_end);
-		__flush_dcache_area((unsigned long)__idmap_text_start,
+		dcache_clean_inval_poc((unsigned long)__idmap_text_start,
 				    (unsigned long)__idmap_text_end);
 
 		/* Clean kvm setup code to PoC? */
 		if (el2_reset_needed()) {
-			__flush_dcache_area(
+			dcache_clean_inval_poc(
 				(unsigned long)__hyp_idmap_text_start,
 				(unsigned long)__hyp_idmap_text_end);
-			__flush_dcache_area((unsigned long)__hyp_text_start,
+			dcache_clean_inval_poc((unsigned long)__hyp_text_start,
 					    (unsigned long)__hyp_text_end);
 		}
 
@@ -477,7 +477,7 @@ int swsusp_arch_resume(void)
 	 * The hibernate exit text contains a set of el2 vectors, that will
 	 * be executed at el2 with the mmu off in order to reload hyp-stub.
 	 */
-	__flush_dcache_area((unsigned long)hibernate_exit,
+	dcache_clean_inval_poc((unsigned long)hibernate_exit,
 			    (unsigned long)hibernate_exit + exit_size);
 
 	/*

arch/arm64/kernel/idreg-override.c

@@ -237,7 +237,7 @@ asmlinkage void __init init_feature_override(void)
 
 	for (i = 0; i < ARRAY_SIZE(regs); i++) {
 		if (regs[i]->override)
-			__flush_dcache_area((unsigned long)regs[i]->override,
+			dcache_clean_inval_poc((unsigned long)regs[i]->override,
 					    (unsigned long)regs[i]->override +
 					    sizeof(*regs[i]->override));
 	}