This makes it simple to test if all cache types are mappable.

Signed-off-by: Guido Günther <guido.gunt...@puri.sm>
---
Prompted by 

  https://lists.freedesktop.org/archives/etnaviv/2018-September/001946.html

 tests/etnaviv/etnaviv_bo_cache_test.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tests/etnaviv/etnaviv_bo_cache_test.c 
b/tests/etnaviv/etnaviv_bo_cache_test.c
index 7fb06293..0ad37e19 100644
--- a/tests/etnaviv/etnaviv_bo_cache_test.c
+++ b/tests/etnaviv/etnaviv_bo_cache_test.c
@@ -28,6 +28,7 @@
 #include <assert.h>
 
 #include <fcntl.h>
+#include <inttypes.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
@@ -78,6 +79,28 @@ static void test_size_rounding(struct etna_device *dev)
        printf("ok\n");
 }
 
+
+static void test_write(struct etna_device *dev, uint32_t flags)
+{
+       struct etna_bo *bo;
+       uint32_t *buf;
+
+       /* allocate, map, write to, and free of a bo */
+       printf("testing bo map with flags 0x%"PRIx32"... ", flags);
+       fflush(stdout);
+
+       bo = etna_bo_new(dev, 0x100, flags);
+       assert(bo);
+       buf = etna_bo_map(bo);
+       assert(buf);
+       assert(!etna_bo_cpu_prep(bo, DRM_ETNA_PREP_WRITE));
+       memset(buf, 0, 0x100);
+       etna_bo_cpu_fini(bo);
+       etna_bo_del(bo);
+
+       printf("ok\n");
+}
+
 int main(int argc, char *argv[])
 {
        struct etna_device *dev;
@@ -107,6 +130,9 @@ int main(int argc, char *argv[])
 
        test_cache(dev);
        test_size_rounding(dev);
+       test_write(dev, ETNA_BO_CACHED);
+       test_write(dev, ETNA_BO_WC);
+       test_write(dev, ETNA_BO_UNCACHED);
 
        etna_device_del(dev);
 
-- 
2.18.0
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