linux-kernel - [PATCH v5 5/6] arm64: move ARM64_HAS_CACHE_DIC/

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Date:   Thu,  2 Jan 2020 16:13:56 -0500
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     pasha.tatashin@...een.com, jmorris@...ei.org, sashal@...nel.org,
        linux-kernel@...r.kernel.org, catalin.marinas@....com,
        will@...nel.org, steve.capper@....com,
        linux-arm-kernel@...ts.infradead.org, maz@...nel.org,
        james.morse@....com, vladimir.murzin@....com, mark.rutland@....com,
        tglx@...utronix.de, gregkh@...uxfoundation.org,
        allison@...utok.net, info@...ux.net, alexios.zavras@...el.com,
        sstabellini@...nel.org, boris.ostrovsky@...cle.com,
        jgross@...e.com, stefan@...er.ch, yamada.masahiro@...ionext.com,
        xen-devel@...ts.xenproject.org, linux@...linux.org.uk,
        andrew.cooper3@...rix.com, julien@....org
Subject: [PATCH v5 5/6] arm64: move ARM64_HAS_CACHE_DIC/_IDC from asm to C

The assmbly functions __asm_flush_cache_user_range and
__asm_invalidate_icache_range have alternatives:

alternative_if ARM64_HAS_CACHE_DIC
...

alternative_if ARM64_HAS_CACHE_IDC
...

But, the implementation of those alternatives is trivial and therefore
can be done in the C inline wrappers.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
---
 arch/arm64/include/asm/cacheflush.h | 19 +++++++++++++++++++
 arch/arm64/mm/cache.S               | 27 +++++----------------------
 arch/arm64/mm/flush.c               |  1 +
 3 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 047af338ba15..fc5217a18398 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -77,8 +77,22 @@ static inline long __flush_cache_user_range(unsigned long start,
 {
 	int ret;
 
+	if (cpus_have_const_cap(ARM64_HAS_CACHE_IDC)) {
+		dsb(ishst);
+		if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) {
+			isb();
+			return 0;
+		}
+	}
+
 	uaccess_ttbr0_enable();
 	ret = __asm_flush_cache_user_range(start, end);
+
+	if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC))
+		isb();
+	else
+		__asm_invalidate_icache_range(start, end);
+
 	uaccess_ttbr0_disable();
 
 	return ret;
@@ -94,6 +108,11 @@ static inline int invalidate_icache_range(unsigned long start,
 {
 	int ret;
 
+	if (cpus_have_const_cap(ARM64_HAS_CACHE_DIC)) {
+		isb();
+		return 0;
+	}
+
 	uaccess_ttbr0_enable();
 	ret = __asm_invalidate_icache_range(start, end);
 	uaccess_ttbr0_disable();
diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
index 1981cbaf5d92..0093bb9fcd12 100644
--- a/arch/arm64/mm/cache.S
+++ b/arch/arm64/mm/cache.S
@@ -25,30 +25,18 @@
  *	- end     - virtual end address of region
  */
 ENTRY(__asm_flush_cache_user_range)
-alternative_if ARM64_HAS_CACHE_IDC
-	dsb	ishst
-	b	7f
-alternative_else_nop_endif
 	dcache_line_size x2, x3
 	sub	x3, x2, #1
 	bic	x4, x0, x3
-1:
-user_alt 9f, "dc cvau, x4",  "dc civac, x4",  ARM64_WORKAROUND_CLEAN_CACHE
+1:	user_alt 3f, "dc cvau, x4",  "dc civac, x4",  ARM64_WORKAROUND_CLEAN_CACHE
 	add	x4, x4, x2
 	cmp	x4, x1
 	b.lo	1b
 	dsb	ish
-
-7:
-alternative_if ARM64_HAS_CACHE_DIC
-	isb
-	b	8f
-alternative_else_nop_endif
-	invalidate_icache_by_line x0, x1, x2, x3, 9f
-8:	mov	x0, #0
-1:	ret
-9:	mov	x0, #-EFAULT
-	b	1b
+	mov	x0, #0
+2:	ret
+3:	mov	x0, #-EFAULT
+	b	2b
 ENDPROC(__asm_flush_cache_user_range)
 
 /*
@@ -60,11 +48,6 @@ ENDPROC(__asm_flush_cache_user_range)
  *	- end     - virtual end address of region
  */
 ENTRY(__asm_invalidate_icache_range)
-alternative_if ARM64_HAS_CACHE_DIC
-	mov	x0, xzr
-	isb
-	ret
-alternative_else_nop_endif
 	invalidate_icache_by_line x0, x1, x2, x3, 2f
 	mov	x0, xzr
 1:	ret
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index 61521285f27d..adfdacb163ad 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -76,6 +76,7 @@ EXPORT_SYMBOL(flush_dcache_page);
  * Additional functions defined in assembly.
  */
 EXPORT_SYMBOL(__asm_flush_cache_user_range);
+EXPORT_SYMBOL(__asm_invalidate_icache_range);
 
 #ifdef CONFIG_ARCH_HAS_PMEM_API
 void arch_wb_cache_pmem(void *addr, size_t size)
-- 
2.17.1