Add basic tests for the lmb memory allocation code used to reserve and allocate memory during boot.
Signed-off-by: Simon Goldschmidt simon.k.r.goldschmidt@gmail.com ---
Changes in v7: None Changes in v6: None Changes in v5: - this patch is new in v5
Changes in v4: None Changes in v2: None
test/lib/Makefile | 1 + test/lib/lmb.c | 297 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 298 insertions(+) create mode 100644 test/lib/lmb.c
diff --git a/test/lib/Makefile b/test/lib/Makefile index ea68fae566..5a636aac74 100644 --- a/test/lib/Makefile +++ b/test/lib/Makefile @@ -3,3 +3,4 @@ # (C) Copyright 2018 # Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc obj-y += hexdump.o +obj-y += lmb.o diff --git a/test/lib/lmb.c b/test/lib/lmb.c new file mode 100644 index 0000000000..dd7ba14b34 --- /dev/null +++ b/test/lib/lmb.c @@ -0,0 +1,297 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2018 Simon Goldschmidt + */ + +#include <common.h> +#include <lmb.h> +#include <dm/test.h> +#include <test/ut.h> + +static int check_lmb(struct unit_test_state *uts, struct lmb *lmb, + phys_addr_t ram_base, phys_size_t ram_size, + unsigned long num_reserved, + phys_addr_t base1, phys_size_t size1, + phys_addr_t base2, phys_size_t size2, + phys_addr_t base3, phys_size_t size3) +{ + ut_asserteq(lmb->memory.cnt, 1); + ut_asserteq(lmb->memory.region[0].base, ram_base); + ut_asserteq(lmb->memory.region[0].size, ram_size); + + ut_asserteq(lmb->reserved.cnt, num_reserved); + if (num_reserved > 0) { + ut_asserteq(lmb->reserved.region[0].base, base1); + ut_asserteq(lmb->reserved.region[0].size, size1); + } + if (num_reserved > 1) { + ut_asserteq(lmb->reserved.region[1].base, base2); + ut_asserteq(lmb->reserved.region[1].size, size2); + } + if (num_reserved > 2) { + ut_asserteq(lmb->reserved.region[2].base, base3); + ut_asserteq(lmb->reserved.region[2].size, size3); + } + return 0; +} + +#define ASSERT_LMB(lmb, ram_base, ram_size, num_reserved, base1, size1, \ + base2, size2, base3, size3) \ + ut_assert(!check_lmb(uts, lmb, ram_base, ram_size, \ + num_reserved, base1, size1, base2, size2, base3, \ + size3)) + +/* + * Test helper function that reserves 64 KiB somewhere in the simulated RAM and + * then does some alloc + free tests. + */ +static int test_multi_alloc(struct unit_test_state *uts, + const phys_addr_t ram, const phys_size_t ram_size, + const phys_addr_t alloc_64k_addr) +{ + const phys_addr_t ram_end = ram + ram_size; + const phys_addr_t alloc_64k_end = alloc_64k_addr + 0x10000; + + struct lmb lmb; + long ret; + phys_addr_t a, a2, b, b2, c, d; + + /* check for overflow */ + ut_assert(ram_end == 0 || ram_end > ram); + ut_assert(alloc_64k_end > alloc_64k_addr); + /* check input addresses + size */ + ut_assert(alloc_64k_addr >= ram + 8); + ut_assert(alloc_64k_end <= ram_end - 8); + + lmb_init(&lmb); + + ret = lmb_add(&lmb, ram, ram_size); + ut_asserteq(ret, 0); + + /* reserve 64KiB somewhere */ + ret = lmb_reserve(&lmb, alloc_64k_addr, 0x10000); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000, + 0, 0, 0, 0); + + /* allocate somewhere, should be at the end of RAM */ + a = lmb_alloc(&lmb, 4, 1); + ut_asserteq(a, ram_end - 4); + ASSERT_LMB(&lmb, ram, ram_size, 2, alloc_64k_addr, 0x10000, + ram_end - 4, 4, 0, 0); + /* alloc below end of reserved region -> below reserved region */ + b = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end); + ut_asserteq(b, alloc_64k_addr - 4); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 4, 0x10000 + 4, ram_end - 4, 4, 0, 0); + + /* 2nd time */ + c = lmb_alloc(&lmb, 4, 1); + ut_asserteq(c, ram_end - 8); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 4, 0x10000 + 4, ram_end - 8, 8, 0, 0); + d = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end); + ut_asserteq(d, alloc_64k_addr - 8); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 8, 0, 0); + + ret = lmb_free(&lmb, a, 4); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0); + /* allocate again to ensure we get the same address */ + a2 = lmb_alloc(&lmb, 4, 1); + ut_asserteq(a, a2); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 8, 0, 0); + ret = lmb_free(&lmb, a2, 4); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0); + + ret = lmb_free(&lmb, b, 4); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 3, + alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000, + ram_end - 8, 4); + /* allocate again to ensure we get the same address */ + b2 = lmb_alloc_base(&lmb, 4, 1, alloc_64k_end); + ut_asserteq(b, b2); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 8, 0x10000 + 8, ram_end - 8, 4, 0, 0); + ret = lmb_free(&lmb, b2, 4); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 3, + alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000, + ram_end - 8, 4); + + ret = lmb_free(&lmb, c, 4); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 2, + alloc_64k_addr - 8, 4, alloc_64k_addr, 0x10000, 0, 0); + ret = lmb_free(&lmb, d, 4); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000, + 0, 0, 0, 0); + + return 0; +} + +static int test_multi_alloc_512mb(struct unit_test_state *uts, + const phys_addr_t ram) +{ + return test_multi_alloc(uts, ram, 0x20000000, ram + 0x10000000); +} + +/* Create a memory region with one reserved region and allocate */ +static int lib_test_lmb_simple(struct unit_test_state *uts) +{ + /* simulate 512 MiB RAM beginning at 1GiB */ + return test_multi_alloc_512mb(uts, 0x40000000); +} + +DM_TEST(lib_test_lmb_simple, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT); + +/* Simulate 512 MiB RAM, allocate some blocks that fit/don't fit */ +static int test_bigblock(struct unit_test_state *uts, const phys_addr_t ram) +{ + const phys_size_t ram_size = 0x20000000; + const phys_size_t big_block_size = 0x10000000; + const phys_addr_t ram_end = ram + ram_size; + const phys_addr_t alloc_64k_addr = ram + 0x10000000; + struct lmb lmb; + long ret; + phys_addr_t a, b; + + /* check for overflow */ + ut_assert(ram_end == 0 || ram_end > ram); + + lmb_init(&lmb); + + ret = lmb_add(&lmb, ram, ram_size); + ut_asserteq(ret, 0); + + /* reserve 64KiB in the middle of RAM */ + ret = lmb_reserve(&lmb, alloc_64k_addr, 0x10000); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000, + 0, 0, 0, 0); + + /* allocate a big block, should be below reserved */ + a = lmb_alloc(&lmb, big_block_size, 1); + ut_asserteq(a, ram); + ASSERT_LMB(&lmb, ram, ram_size, 1, a, + big_block_size + 0x10000, 0, 0, 0, 0); + /* allocate 2nd big block */ + /* This should fail, printing an error */ + b = lmb_alloc(&lmb, big_block_size, 1); + ut_asserteq(b, 0); + ASSERT_LMB(&lmb, ram, ram_size, 1, a, + big_block_size + 0x10000, 0, 0, 0, 0); + + ret = lmb_free(&lmb, a, big_block_size); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000, + 0, 0, 0, 0); + + /* allocate too big block */ + /* This should fail, printing an error */ + a = lmb_alloc(&lmb, ram_size, 1); + ut_asserteq(a, 0); + ASSERT_LMB(&lmb, ram, ram_size, 1, alloc_64k_addr, 0x10000, + 0, 0, 0, 0); + + return 0; +} + +static int lib_test_lmb_big(struct unit_test_state *uts) +{ + return test_bigblock(uts, 0x40000000); +} + +DM_TEST(lib_test_lmb_big, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT); + +/* Simulate 512 MiB RAM, allocate a block without previous reservation */ +static int test_noreserved(struct unit_test_state *uts, const phys_addr_t ram) +{ + const phys_size_t ram_size = 0x20000000; + const phys_addr_t ram_end = ram + ram_size; + struct lmb lmb; + long ret; + phys_addr_t a, b; + + /* check for overflow */ + ut_assert(ram_end == 0 || ram_end > ram); + + lmb_init(&lmb); + + ret = lmb_add(&lmb, ram, ram_size); + ut_asserteq(ret, 0); + + /* allocate a block */ + a = lmb_alloc(&lmb, 4, 1); + ut_assert(a != 0); + /* and free it */ + ret = lmb_free(&lmb, a, 4); + ut_asserteq(ret, 0); + + /* allocate a block with base*/ + b = lmb_alloc_base(&lmb, 4, 1, ram_end); + ut_assert(a == b); + /* and free it */ + ret = lmb_free(&lmb, b, 4); + ut_asserteq(ret, 0); + + return 0; +} + +static int lib_test_lmb_noreserved(struct unit_test_state *uts) +{ + return test_noreserved(uts, 0x40000000); +} + +DM_TEST(lib_test_lmb_noreserved, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT); + +/* + * Simulate a RAM that starts at 0 and allocate down to address 0, which must + * fail as '0' means failure for the lmb_alloc functions. + */ +static int lib_test_lmb_at_0(struct unit_test_state *uts) +{ + const phys_addr_t ram = 0; + const phys_size_t ram_size = 0x20000000; + struct lmb lmb; + long ret; + phys_addr_t a, b; + + lmb_init(&lmb); + + ret = lmb_add(&lmb, ram, ram_size); + ut_asserteq(ret, 0); + + /* allocate nearly everything */ + a = lmb_alloc(&lmb, ram_size - 4, 1); + ut_asserteq(a, ram + 4); + ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4, + 0, 0, 0, 0); + /* allocate the rest */ + /* This should fail as the allocated address would be 0 */ + b = lmb_alloc(&lmb, 4, 1); + ut_asserteq(b, 0); + /* check that this was an error by checking lmb */ + ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4, + 0, 0, 0, 0); + /* check that this was an error by freeing b */ + ret = lmb_free(&lmb, b, 4); + ut_asserteq(ret, -1); + ASSERT_LMB(&lmb, ram, ram_size, 1, a, ram_size - 4, + 0, 0, 0, 0); + + ret = lmb_free(&lmb, a, ram_size - 4); + ut_asserteq(ret, 0); + ASSERT_LMB(&lmb, ram, ram_size, 0, 0, 0, 0, 0, 0, 0); + + return 0; +} + +DM_TEST(lib_test_lmb_at_0, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);