[PATCH 1/2] of/unittest: Add empty dma-ranges address translation tests

Andrea della Porta
2024-11-08T10:38:58Z

Intermediate DT PCI nodes dynamically generated by enabling
CONFIG_PCI_DYNAMIC_OF_NODES have empty dma-ranges property. PCI address
specifiers have 3 cells and when dma-ranges is missing or empty,
of_translate_one() is currently dropping the flag portion of PCI addresses
which are subnodes of the aforementioned ones, failing the translation.
Add new tests covering this case.

With this test, we get 1 new failure which is fixed in subsequent
commit:

FAIL of_unittest_pci_empty_dma_ranges():1245 for_each_of_pci_range wrong CPU addr (ffffffffffffffff) on node /testcase-data/address-tests2/pcie@d1070000/pci@0,0/dev@0,0/local-bus@0

Signed-off-by: Andrea della Porta <andrea.porta@suse.com>
---
drivers/of/unittest-data/tests-address.dtsi | 2 ++
drivers/of/unittest.c | 39 +++++++++++++++++++++
2 files changed, 41 insertions(+)

diff --git a/drivers/of/unittest-data/tests-address.dtsi b/drivers/of/unittest-data/tests-address.dtsi
index 3344f15c3755..f02a181bb125 100644
--- a/drivers/of/unittest-data/tests-address.dtsi
+++ b/drivers/of/unittest-data/tests-address.dtsi
@@ -114,6 +114,7 @@ pcie@d1070000 {
device_type = "pci";
ranges = <0x82000000 0 0xe8000000 0 0xe8000000 0 0x7f00000>,
<0x81000000 0 0x00000000 0 0xefff0000 0 0x0010000>;
+ dma-ranges = <0x43000000 0x10 0x00 0x00 0x00 0x00 0x10000000>;
reg = <0x00000000 0xd1070000 0x20000>;

pci@0,0 {
@@ -142,6 +143,7 @@ local-bus@0 {
#size-cells = <0x01>;
ranges = <0xa0000000 0 0 0 0x2000000>,
<0xb0000000 1 0 0 0x1000000>;
+ dma-ranges = <0xc0000000 0x43000000 0x10 0x00 0x10000000>;

dev@e0000000 {
reg = <0xa0001000 0x1000>,
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index daf9a2dddd7e..80483e38d7b4 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -1213,6 +1213,44 @@ static void __init of_unittest_pci_dma_ranges(void)
of_node_put(np);
}

+static void __init of_unittest_pci_empty_dma_ranges(void)
+{
+ struct device_node *np;
+ struct of_pci_range range;
+ struct of_pci_range_parser parser;
+
+ if (!IS_ENABLED(CONFIG_PCI))
+ return;
+
+ np = of_find_node_by_path("/testcase-data/address-tests2/pcie@d1070000/pci@0,0/dev@0,0/local-bus@0");
+ if (!np) {
+ pr_err("missing testcase data\n");
+ return;
+ }
+
+ if (of_pci_dma_range_parser_init(&parser, np)) {
+ pr_err("missing dma-ranges property\n");
+ return;
+ }
+
+ /*
+ * Get the dma-ranges from the device tree
+ */
+ for_each_of_pci_range(&parser, &range) {
+ unittest(range.size == 0x10000000,
+ "for_each_of_pci_range wrong size on node %pOF size=%llx\n",
+ np, range.size);
+ unittest(range.cpu_addr == 0x00000000,
+ "for_each_of_pci_range wrong CPU addr (%llx) on node %pOF",
+ range.cpu_addr, np);
+ unittest(range.pci_addr == 0xc0000000,
+ "for_each_of_pci_range wrong DMA addr (%llx) on node %pOF",
+ range.pci_addr, np);
+ }
+
+ of_node_put(np);
+}
+
static void __init of_unittest_bus_ranges(void)
{
struct device_node *np;
@@ -4272,6 +4310,7 @@ static int __init of_unittest(void)
of_unittest_dma_get_max_cpu_address();
of_unittest_parse_dma_ranges();
of_unittest_pci_dma_ranges();
+ of_unittest_pci_empty_dma_ranges();
of_unittest_bus_ranges();
of_unittest_bus_3cell_ranges();
of_unittest_reg();
--
2.35.3