1 files changed, 99 insertions, 0 deletions
diff --git a/test/dm/iommu.c b/test/dm/iommu.c
new file mode 100644
index 00000000000..acea5f28971
--- /dev/null
+++ b/test/dm/iommu.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
+ */
+
+#include <dm.h>
+#include <dm/test.h>
+#include <dm/uclass-internal.h>
+#include <iommu.h>
+#include <malloc.h>
+#include <test/test.h>
+#include <test/ut.h>
+#include <asm/io.h>
+
+static int dm_test_iommu(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+	dma_addr_t dva;
+	void *addr;
+
+	ut_assertok(uclass_find_device(UCLASS_IOMMU, 0, &dev));
+	ut_assert(!(dev_get_flags(dev) & DM_FLAG_ACTIVATED));
+
+	/* Probing USB probes the IOMMU through the "iommus" property */
+	ut_assertok(uclass_probe_all(UCLASS_USB));
+	ut_assert(dev_get_flags(dev) & DM_FLAG_ACTIVATED);
+
+	addr = malloc(256);
+	ut_assert(addr);
+
+	ut_assertok(uclass_find_device(UCLASS_USB, 0, &dev));
+	dva = dev_iommu_dma_map(dev, addr, 256);
+	ut_assert(dva >= 0x89abc000 && dva < 0x89ac00000);
+
+	dev_iommu_dma_unmap(dev, dva, 256);
+
+	free(addr);
+
+	return 0;
+}
+DM_TEST(dm_test_iommu, UT_TESTF_SCAN_FDT);
+
+static int dm_test_iommu_noiommu(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+	dma_addr_t dva;
+	void *addr;
+
+	ut_assertok(uclass_find_device(UCLASS_IOMMU, 0, &dev));
+	ut_assert(!(dev_get_flags(dev) & DM_FLAG_ACTIVATED));
+
+	/* Probing ethernet should not probe the IOMMU */
+	ut_assertok(uclass_probe_all(UCLASS_ETH));
+	ut_assert(!(dev_get_flags(dev) & DM_FLAG_ACTIVATED));
+
+	addr = malloc(256);
+	ut_assert(addr);
+
+	ut_assertok(uclass_find_device(UCLASS_ETH, 0, &dev));
+	dva = dev_iommu_dma_map(dev, addr, 256);
+	ut_assert(dva == virt_to_phys(addr));
+
+	dev_iommu_dma_unmap(dev, dva, 256);
+
+	free(addr);
+
+	return 0;
+}
+DM_TEST(dm_test_iommu_noiommu, UT_TESTF_SCAN_FDT);
+
+static int dm_test_iommu_pci(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+
+	ut_assertok(uclass_find_device(UCLASS_IOMMU, 0, &dev));
+	ut_assert(!(dev_get_flags(dev) & DM_FLAG_ACTIVATED));
+
+	/* Probing P2SB probes the IOMMU through the "iommu-map" property */
+	ut_assertok(uclass_probe_all(UCLASS_P2SB));
+	ut_assert(dev_get_flags(dev) & DM_FLAG_ACTIVATED);
+
+	return 0;
+}
+DM_TEST(dm_test_iommu_pci, UT_TESTF_SCAN_FDT);
+
+static int dm_test_iommu_pci_noiommu(struct unit_test_state *uts)
+{
+	struct udevice *dev;
+
+	ut_assertok(uclass_find_device(UCLASS_IOMMU, 0, &dev));
+	ut_assert(!(dev_get_flags(dev) & DM_FLAG_ACTIVATED));
+
+	/* Probing PMC should not probe the IOMMU */
+	ut_assertok(uclass_probe_all(UCLASS_ACPI_PMC));
+	ut_assert(!(dev_get_flags(dev) & DM_FLAG_ACTIVATED));
+
+	return 0;
+}
+DM_TEST(dm_test_iommu_pci_noiommu, UT_TESTF_SCAN_FDT);