[Xen-devel] [PATCH v1 1/2] xen/arm: Introduce clean_and_invalidate_xen_dcache() macro

[Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>]

This macro is very similar to clean_xen_dcache(), but it performs
clean and invalidate dcache.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Oleksandr Tyshchenko <oleksandr.tyshchenko@xxxxxxxxxxxxxxx>
---
 xen/include/asm-arm/page.h |   26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/xen/include/asm-arm/page.h b/xen/include/asm-arm/page.h
index e00be9e..34effa1 100644
--- a/xen/include/asm-arm/page.h
+++ b/xen/include/asm-arm/page.h
@@ -226,7 +226,7 @@ static inline lpae_t mfn_to_xen_entry(unsigned long mfn)
 /* Actual cacheline size on the boot CPU. */
 extern size_t cacheline_bytes;
 
-/* Function for flushing medium-sized areas.
+/* Functions for flushing medium-sized areas.
  * if 'range' is large enough we might want to use model-specific
  * full-cache flushes. */
 static inline void clean_xen_dcache_va_range(void *p, unsigned long size)
@@ -238,7 +238,17 @@ static inline void clean_xen_dcache_va_range(void *p, 
unsigned long size)
     dsb();           /* So we know the flushes happen before continuing */
 }
 
-/* Macro for flushing a single small item.  The predicate is always
+static inline void clean_and_invalidate_xen_dcache_va_range(void *p,
+               unsigned long size)
+{
+    void *end;
+    dsb();           /* So the CPU issues all writes to the range */
+    for ( end = p + size; p < end; p += cacheline_bytes )
+        asm volatile (__clean_and_invalidate_xen_dcache_one(0) : : "r" (p));
+    dsb();           /* So we know the flushes happen before continuing */
+}
+
+/* Macros for flushing a single small item.  The predicate is always
  * compile-time constant so this will compile down to 3 instructions in
  * the common case. */
 #define clean_xen_dcache(x) do {                                        \
@@ -253,6 +263,18 @@ static inline void clean_xen_dcache_va_range(void *p, 
unsigned long size)
             : : "r" (_p), "m" (*_p));                                   \
 } while (0)
 
+#define clean_and_invalidate_xen_dcache(x) do {                         \
+    typeof(x) *_p = &(x);                                               \
+    if ( sizeof(x) > MIN_CACHELINE_BYTES || sizeof(x) > alignof(x) )    \
+        clean_and_invalidate_xen_dcache_va_range(_p, sizeof(x));        \
+    else                                                                \
+        asm volatile (                                                  \
+            "dsb sy;"   /* Finish all earlier writes */                 \
+            __clean_and_invalidate_xen_dcache_one(0)                    \
+            "dsb sy;"   /* Finish flush before continuing */            \
+            : : "r" (_p), "m" (*_p));                                   \
+} while (0)
+
 /* Flush the dcache for an entire page. */
 void flush_page_to_ram(unsigned long mfn);
 
-- 
1.7.9.5


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