diff options
| -rw-r--r-- | doc/develop/driver-model/livetree.rst | 17 | ||||
| -rw-r--r-- | include/test/test.h | 6 | ||||
| -rw-r--r-- | test/test-main.c | 74 |
3 files changed, 83 insertions, 14 deletions
diff --git a/doc/develop/driver-model/livetree.rst b/doc/develop/driver-model/livetree.rst index faf3eb5b5f0..4ef8c517325 100644 --- a/doc/develop/driver-model/livetree.rst +++ b/doc/develop/driver-model/livetree.rst @@ -235,20 +235,9 @@ tree either present or absent. This is to make sure that the flat tree functions work correctly even with OF_LIVE is enabled. But if a test modifies the flat device tree, then the live tree can become invalid. Any live tree tests that run after that point will use a corrupted tree, e.g. with an incorrect property name -or worse. To deal with this we use a flag UT_TESTF_LIVE_OR_FLAT then ensures -that tests which write to the flat tree are not run if OF_LIVE is enabled. Only -the live tree version of the test is run, when OF_LIVE is enabled, with -sandbox_flattree running the flat tree version. - -This is of course a work-around, even if a reasonable one. One solution to this -problem would be to make a copy of the flat tree before the test and restore it -afterwards, in the same memory location, so that the live tree pointers work -again. Another would be to regenerate the live tree if a test modified the flat -tree. - -Neither of these solutions is currently implemented, since the situation that -causes the problem can only occur in sandbox tests, is somewhat esoteric and -the UT_TESTF_LIVE_OR_FLAT flag deals with it in a reasonable way. +or worse. To deal with this we take a copy of the device tree and restore it +after any test that modifies it. Note that this copy is not made on other +boards, only sandbox. Multiple livetrees diff --git a/include/test/test.h b/include/test/test.h index 799e9180863..92215d427b0 100644 --- a/include/test/test.h +++ b/include/test/test.h @@ -20,6 +20,9 @@ * @testdev: Test device * @force_fail_alloc: Force all memory allocs to fail * @skip_post_probe: Skip uclass post-probe processing + * @fdt_chksum: crc8 of the device tree contents + * @fdt_copy: Copy of the device tree + * @fdt_size: Size of the device-tree copy * @runs_per_test: Number of times to run each test (typically 1) * @expect_str: Temporary string used to hold expected string value * @actual_str: Temporary string used to hold actual string value @@ -33,6 +36,9 @@ struct unit_test_state { struct udevice *testdev; int force_fail_alloc; int skip_post_probe; + uint fdt_chksum; + void *fdt_copy; + uint fdt_size; int runs_per_test; char expect_str[512]; char actual_str[512]; diff --git a/test/test-main.c b/test/test-main.c index 7a3871624cb..082821ef3e0 100644 --- a/test/test-main.c +++ b/test/test-main.c @@ -9,14 +9,51 @@ #include <cyclic.h> #include <dm.h> #include <event.h> +#include <os.h> #include <dm/root.h> #include <dm/test.h> #include <dm/uclass-internal.h> #include <test/test.h> #include <test/ut.h> +#include <u-boot/crc.h> DECLARE_GLOBAL_DATA_PTR; +/** + * enum fdtchk_t - what to do with the device tree (gd->fdt_blob) + * + * This affects what happens with the device tree before and after a test + * + * @FDTCHK_NONE: Do nothing + * @FDTCHK_CHECKSUM: Take a checksum of the FDT before the test runs and + * compare it afterwards to detect any changes + * @FDTCHK_COPY: Make a copy of the FDT and restore it afterwards + */ +enum fdtchk_t { + FDTCHK_NONE, + FDTCHK_CHECKSUM, + FDTCHK_COPY, +}; + +/** + * fdt_action() - get the required action for the FDT + * + * @return the action that should be taken for this build + */ +static enum fdtchk_t fdt_action(void) +{ + /* Do a copy for sandbox (but only the U-Boot build, not SPL) */ + if (CONFIG_IS_ENABLED(SANDBOX)) + return FDTCHK_COPY; + + /* For sandbox SPL builds, do nothing */ + if (IS_ENABLED(CONFIG_SANDBOX)) + return FDTCHK_NONE; + + /* For all other boards, do a checksum */ + return FDTCHK_CHECKSUM; +} + /* This is valid when a test is running, NULL otherwise */ static struct unit_test_state *cur_test_state; @@ -46,6 +83,9 @@ static int dm_test_pre_run(struct unit_test_state *uts) uts->testdev = NULL; uts->force_fail_alloc = false; uts->skip_post_probe = false; + if (fdt_action() == FDTCHK_CHECKSUM) + uts->fdt_chksum = crc8(0, gd->fdt_blob, + fdt_totalsize(gd->fdt_blob)); gd->dm_root = NULL; malloc_disable_testing(); if (CONFIG_IS_ENABLED(UT_DM) && !CONFIG_IS_ENABLED(OF_PLATDATA)) @@ -64,6 +104,25 @@ static int dm_test_post_run(struct unit_test_state *uts) { int id; + if (gd->fdt_blob) { + switch (fdt_action()) { + case FDTCHK_COPY: + memcpy((void *)gd->fdt_blob, uts->fdt_copy, uts->fdt_size); + break; + case FDTCHK_CHECKSUM: { + uint chksum; + + chksum = crc8(0, gd->fdt_blob, fdt_totalsize(gd->fdt_blob)); + + if (chksum != uts->fdt_chksum) + printf("Device tree changed: cannot run live tree tests\n"); + break; + } + case FDTCHK_NONE: + break; + } + } + /* * With of-platdata-inst the uclasses are created at build time. If we * destroy them we cannot get them back since uclass_add() is not @@ -443,8 +502,23 @@ int ut_run_list(const char *category, const char *prefix, uts.of_root = gd_of_root(); uts.runs_per_test = runs_per_test; + if (fdt_action() == FDTCHK_COPY && gd->fdt_blob) { + uts.fdt_size = fdt_totalsize(gd->fdt_blob); + uts.fdt_copy = os_malloc(uts.fdt_size); + if (!uts.fdt_copy) { + printf("Out of memory for device tree copy\n"); + return -ENOMEM; + } + memcpy(uts.fdt_copy, gd->fdt_blob, uts.fdt_size); + } ret = ut_run_tests(&uts, prefix, tests, count, select_name); + /* Best efforts only...ignore errors */ + if (has_dm_tests) + dm_test_restore(uts.of_root); + if (IS_ENABLED(CONFIG_SANDBOX)) + os_free(uts.fdt_copy); + if (ret == -ENOENT) printf("Test '%s' not found\n", select_name); else |