add mappable bit in DMA segment (#215)

remove duplicate code for initializing DMA segment,  mark DMA segment whether it's mappable, plus basic unit test for dma_addr_to_sg

Signed-off-by: Thanos Makatos <thanos.makatos@nutanix.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/test/unit-tests.c b/test/unit-tests.c
index 6355843..9063038 100644
--- a/test/unit-tests.c
+++ b/test/unit-tests.c
@@ -681,6 +681,31 @@ test_dma_map_sg(void **state __attribute__((unused)))
 }
 
 static void
+test_dma_addr_to_sg(void **state __attribute__((unused)))
+{
+    dma_controller_t *dma = alloca(sizeof(dma_controller_t) + sizeof(dma_memory_region_t));
+    dma_sg_t sg;
+    dma_memory_region_t *r;
+
+    dma->nregions = 1;
+    r = &dma->regions[0];
+    r->dma_addr = 0x1000;
+    r->size = 0x4000;
+    r->virt_addr = (void*)0xdeadbeef;
+
+    /* fast path, region hint hit */
+    assert_int_equal(1,
+        dma_addr_to_sg(dma, 0x2000, 0x400, &sg, 1, PROT_NONE));
+    assert_int_equal(r->dma_addr, sg.dma_addr);
+    assert_int_equal(0, sg.region);
+    assert_int_equal(0x2000 - r->dma_addr, sg.offset);
+    assert_int_equal(0x400, sg.length);
+    assert_true(sg.mappable);
+
+    /* TODO test more scenarios */
+}
+
+static void
 test_vfu_setup_device_dma_cb(void **state __attribute__((unused)))
 {
     vfu_ctx_t vfu_ctx = { 0 };
@@ -722,6 +747,7 @@ int main(void)
         cmocka_unit_test_setup(test_setup_sparse_region, setup),
         cmocka_unit_test_setup(test_dma_map_return_value, setup),
         cmocka_unit_test_setup(test_dma_map_sg, setup),
+        cmocka_unit_test_setup(test_dma_addr_to_sg, setup),
         cmocka_unit_test_setup(test_vfu_setup_device_dma_cb, setup)
     };