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arm64: Update memcpy_{from, to}io() helpers

At early U-Boot stage, before relocation, MMU is not yet configured
and disabled. DDR may not be configured with the correct memory
attributes (can be configured in MT_DEVICE instead of MT_MEMORY).

In this case, usage of memcpy_{from, to}io() may leads to synchronous
abort in AARCH64 in case the normal memory address is not 64Bits aligned.

To avoid such situation, forbid usage of normal memory cast to (u64 *) in
case MMU is not enabled.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Cc: mark.kettenis@xs4all.nl
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Patrice Chotard 2 lat temu
rodzic
commit
268f6ac1f9
3 zmienionych plików z 26 dodań i 10 usunięć
  1. 10 0
      arch/arm/cpu/armv8/cache_v8.c
  2. 15 10
      arch/arm/include/asm/io.h
  3. 1 0
      include/cpu_func.h

+ 10 - 0
arch/arm/cpu/armv8/cache_v8.c

@@ -719,6 +719,11 @@ int icache_status(void)
 	return (get_sctlr() & CR_I) != 0;
 }
 
+int mmu_status(void)
+{
+	return (get_sctlr() & CR_M) != 0;
+}
+
 void invalidate_icache_all(void)
 {
 	__asm_invalidate_icache_all();
@@ -740,6 +745,11 @@ int icache_status(void)
 	return 0;
 }
 
+int mmu_status(void)
+{
+	return 0;
+}
+
 void invalidate_icache_all(void)
 {
 }

+ 15 - 10
arch/arm/include/asm/io.h

@@ -338,6 +338,7 @@ extern void __readwrite_bug(const char *fn);
 
 /* Optimized copy functions to read from/write to IO sapce */
 #ifdef CONFIG_ARM64
+#include <cpu_func.h>
 /*
  * Copy data from IO memory space to "real" memory space.
  */
@@ -351,11 +352,13 @@ void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
 		count--;
 	}
 
-	while (count >= 8) {
-		*(u64 *)to = __raw_readq(from);
-		from += 8;
-		to += 8;
-		count -= 8;
+	if (mmu_status()) {
+		while (count >= 8) {
+			*(u64 *)to = __raw_readq(from);
+			from += 8;
+			to += 8;
+			count -= 8;
+		}
 	}
 
 	while (count) {
@@ -379,11 +382,13 @@ void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
 		count--;
 	}
 
-	while (count >= 8) {
-		__raw_writeq(*(u64 *)from, to);
-		from += 8;
-		to += 8;
-		count -= 8;
+	if (mmu_status()) {
+		while (count >= 8) {
+			__raw_writeq(*(u64 *)from, to);
+			from += 8;
+			to += 8;
+			count -= 8;
+		}
 	}
 
 	while (count) {

+ 1 - 0
include/cpu_func.h

@@ -59,6 +59,7 @@ int dcache_status(void);
 void dcache_enable(void);
 void dcache_disable(void);
 void mmu_disable(void);
+int mmu_status(void);
 
 /* arch/$(ARCH)/lib/cache.c */
 void enable_caches(void);