firewire: test: add test of device attributes for simple AV/C device

At present, core function can handle node which has configuration ROM
similar to standard AV/C device somehow. The standard layout of
configuration ROM is described in the following document.

- Configuration ROM for AV/C Devices 1.0 (Dec. 12, 2000, 1394 Trading
  Association)

This commit adds a KUnit test for the above case.

The following output is the parse result for the hard-coded data, by
config-rom-pretty-printer in linux-firewire-utils
(https://git.kernel.org/pub/scm/utils/ieee1394/linux-firewire-utils.git/).

$ config-rom-pretty-printer < /tmp/rom.img
               ROM header and bus information block
               -----------------------------------------------------------------
1024  0404eabf  bus_info_length 4, crc_length 4, crc 60095
1028  31333934  bus_name "1394"
1032  e0646102  irmc 1, cmc 1, isc 1, bmc 0, cyc_clk_acc 100, max_rec 6 (128)
1036  ffffffff  company_id ffffff     |
1040  ffffffff  device_id 1099511627775  | EUI-64 18446744073709551615

               root directory
               -----------------------------------------------------------------
1044  00063287  directory_length 6, crc 12935
1048  03ffffff  vendor
1052  8100000a  --> descriptor leaf at 1092
1056  17ffffff  model
1060  8100000e  --> descriptor leaf at 1116
1064  0c0083c0  node capabilities: per IEEE 1394
1068  d1000001  --> unit directory at 1072

               unit directory at 1072
               -----------------------------------------------------------------
1072  0004442d  directory_length 4, crc 17453
1076  1200a02d  specifier id
1080  13010001  version
1084  17ffffff  model
1088  81000007  --> descriptor leaf at 1116

               descriptor leaf at 1092
               -----------------------------------------------------------------
1092  0005c915  leaf_length 5, crc 51477
1096  00000000  textual descriptor
1100  00000000  minimal ASCII
1104  56656e64  "Vend"
1108  6f72204e  "or N"
1112  616d6500  "ame"

               descriptor leaf at 1116
               -----------------------------------------------------------------
1116  00057f16  leaf_length 5, crc 32534
1120  00000000  textual descriptor
1124  00000000  minimal ASCII
1128  4d6f6465  "Mode"
1132  6c204e61  "l Na"
1136  6d650000  "me"

Link: https://lore.kernel.org/r/20231221134849.603857-5-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

1 files changed, 119 insertions, 0 deletions

diff --git a/drivers/firewire/device-attribute-test.c b/drivers/firewire/device-attribute-test.c
index 87cfdf97c898..e2c5587d0757 100644
--- a/drivers/firewire/device-attribute-test.c
+++ b/drivers/firewire/device-attribute-test.c
@@ -8,7 +8,126 @@
 
 #include <kunit/test.h>
 
+// Configuration ROM for AV/C Devices 1.0 (Dec. 12, 2000, 1394 Trading Association)
+// Annex C:Configuration ROM example(informative)
+// C.1 Simple AV/C device
+//
+// Copied from the documentation.
+static const u32 simple_avc_config_rom[] = {
+	0x0404eabf,
+	0x31333934,
+	0xe0646102,
+	0xffffffff,
+	0xffffffff,
+	0x00063287, // root directory.
+	0x03ffffff,
+	0x8100000a,
+	0x17ffffff,
+	0x8100000e,
+	0x0c0083c0,
+	0xd1000001,
+	0x0004442d, // unit 0 directory.
+	0x1200a02d,
+	0x13010001,
+	0x17ffffff,
+	0x81000007,
+	0x0005c915, // leaf for textual descriptor.
+	0x00000000,
+	0x00000000,
+	0x56656e64,
+	0x6f72204e,
+	0x616d6500,
+	0x00057f16, // leaf for textual descriptor.
+	0x00000000,
+	0x00000000,
+	0x4d6f6465,
+	0x6c204e61,
+	0x6d650000,
+};
+
+static void device_attr_simple_avc(struct kunit *test)
+{
+	static const struct fw_device node = {
+		.device = {
+			.type = &fw_device_type,
+		},
+		.config_rom = simple_avc_config_rom,
+		.config_rom_length = sizeof(simple_avc_config_rom),
+	};
+	static const struct fw_unit unit0 = {
+		.device = {
+			.type = &fw_unit_type,
+			.parent = (struct device *)&node.device,
+		},
+		.directory = &simple_avc_config_rom[12],
+	};
+	struct device *node_dev = (struct device *)&node.device;
+	struct device *unit0_dev = (struct device *)&unit0.device;
+	static const int unit0_expected_ids[] = {0x00ffffff, 0x00ffffff, 0x0000a02d, 0x00010001};
+	char *buf = kunit_kzalloc(test, PAGE_SIZE, GFP_KERNEL);
+	int ids[4] = {0, 0, 0, 0};
+
+	// Ensure associations for node and unit devices.
+
+	KUNIT_ASSERT_TRUE(test, is_fw_device(node_dev));
+	KUNIT_ASSERT_FALSE(test, is_fw_unit(node_dev));
+	KUNIT_ASSERT_PTR_EQ(test, fw_device(node_dev), &node);
+
+	KUNIT_ASSERT_FALSE(test, is_fw_device(unit0_dev));
+	KUNIT_ASSERT_TRUE(test, is_fw_unit(unit0_dev));
+	KUNIT_ASSERT_PTR_EQ(test, fw_parent_device((&unit0)), &node);
+	KUNIT_ASSERT_PTR_EQ(test, fw_unit(unit0_dev), &unit0);
+
+	// For entries in root directory.
+
+	// Vendor immediate entry is found.
+	KUNIT_EXPECT_GT(test, show_immediate(node_dev, &config_rom_attributes[0].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "0xffffff\n");
+
+	// Model immediate entry is found.
+	KUNIT_EXPECT_GT(test, show_immediate(node_dev, &config_rom_attributes[4].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "0xffffff\n");
+
+	// Descriptor leaf entry for vendor is found.
+	KUNIT_EXPECT_GT(test, show_text_leaf(node_dev, &config_rom_attributes[5].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "Vendor Name\n");
+
+	// Descriptor leaf entry for model is found.
+	KUNIT_EXPECT_GT(test, show_text_leaf(node_dev, &config_rom_attributes[6].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "Model Name\n");
+
+	// For entries in unit 0 directory.
+
+	// Vendor immediate entry is not found.
+	KUNIT_EXPECT_LT(test, show_immediate(unit0_dev, &config_rom_attributes[0].attr, buf), 0);
+
+	// Model immediate entry is found.
+	KUNIT_EXPECT_GT(test, show_immediate(unit0_dev, &config_rom_attributes[4].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "0xffffff\n");
+
+	// Descriptor leaf entry for vendor is not found.
+	KUNIT_EXPECT_LT(test, show_text_leaf(unit0_dev, &config_rom_attributes[5].attr, buf), 0);
+
+	// Descriptor leaf entry for model is found.
+	KUNIT_EXPECT_GT(test, show_text_leaf(unit0_dev, &config_rom_attributes[6].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "Model Name\n");
+
+	// Specifier_ID immediate entry is found.
+	KUNIT_EXPECT_GT(test, show_immediate(unit0_dev, &config_rom_attributes[2].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "0x00a02d\n");
+
+	// Version immediate entry is found.
+	KUNIT_EXPECT_GT(test, show_immediate(unit0_dev, &config_rom_attributes[3].attr, buf), 0);
+	KUNIT_EXPECT_STREQ(test, buf, "0x010001\n");
+
+	kunit_kfree(test, buf);
+
+	get_modalias_ids(&unit0, ids);
+	KUNIT_EXPECT_MEMEQ(test, ids, unit0_expected_ids, sizeof(ids));
+}
+
 static struct kunit_case device_attr_test_cases[] = {
+	KUNIT_CASE(device_attr_simple_avc),
 	{}
 };