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Diffstat (limited to 'quantum/wear_leveling/tests/wear_leveling_4byte.cpp')
| -rw-r--r-- | quantum/wear_leveling/tests/wear_leveling_4byte.cpp | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/quantum/wear_leveling/tests/wear_leveling_4byte.cpp b/quantum/wear_leveling/tests/wear_leveling_4byte.cpp new file mode 100644 index 0000000000..54482c5fe7 --- /dev/null +++ b/quantum/wear_leveling/tests/wear_leveling_4byte.cpp @@ -0,0 +1,193 @@ +// Copyright 2022 Nick Brassel (@tzarc) +// SPDX-License-Identifier: GPL-2.0-or-later +#include <numeric> +#include "gtest/gtest.h" +#include "gmock/gmock.h" +#include "backing_mocks.hpp" + +class WearLeveling4Byte : public ::testing::Test { + protected: + void SetUp() override { + MockBackingStore::Instance().reset_instance(); + wear_leveling_init(); + } +}; + +static std::array<std::uint8_t, WEAR_LEVELING_LOGICAL_SIZE> verify_data; + +static wear_leveling_status_t test_write(const uint32_t address, const void* value, size_t length) { + memcpy(&verify_data[address], value, length); + return wear_leveling_write(address, value, length); +} + +/** + * This test verifies that the first write after initialisation occurs after the FNV1a_64 hash location. + */ +TEST_F(WearLeveling4Byte, FirstWriteOccursAfterHash) { + auto& inst = MockBackingStore::Instance(); + uint8_t test_value = 0x15; + test_write(0x02, &test_value, sizeof(test_value)); + EXPECT_EQ(inst.log_begin()->address, WEAR_LEVELING_LOGICAL_SIZE + 8) << "Invalid first write address."; +} + +/** + * This test verifies that the first write after initialisation occurs after the FNV1a_64 hash location, after an erase has occurred. + */ +TEST_F(WearLeveling4Byte, FirstWriteOccursAfterHash_AfterErase) { + auto& inst = MockBackingStore::Instance(); + uint8_t test_value = 0x15; + wear_leveling_erase(); + test_write(0x02, &test_value, sizeof(test_value)); + EXPECT_EQ((inst.log_begin() + 1)->address, WEAR_LEVELING_LOGICAL_SIZE + 8) << "Invalid first write address."; +} + +/** + * This test ensures the correct number of backing store writes occurs with a multibyte write, given the input buffer size. + */ +TEST_F(WearLeveling4Byte, MultibyteBackingStoreWriteCounts) { + auto& inst = MockBackingStore::Instance(); + + for (std::size_t length = 1; length <= 5; ++length) { + // Clear things out + std::fill(verify_data.begin(), verify_data.end(), 0); + inst.reset_instance(); + wear_leveling_init(); + + // Generate a test block of data + std::vector<std::uint8_t> testvalue(length); + std::iota(testvalue.begin(), testvalue.end(), 0x20); + + // Write the data + EXPECT_EQ(test_write(0, testvalue.data(), testvalue.size()), WEAR_LEVELING_SUCCESS) << "Write failed with incorrect status"; + + std::size_t expected; + if (length > 1) { + expected = 2; + } else { + expected = 1; + } + + // Check that we got the expected number of write log entries + EXPECT_EQ(std::distance(inst.log_begin(), inst.log_end()), expected); + } +} + +/** + * This test forces consolidation by writing enough to the write log that it overflows, consolidating the data into the + * base logical area. + */ +TEST_F(WearLeveling4Byte, ConsolidationOverflow) { + auto& inst = MockBackingStore::Instance(); + + // Generate a test block of data + std::array<std::uint8_t, WEAR_LEVELING_LOGICAL_SIZE> testvalue; + + // Write the data + std::iota(testvalue.begin(), testvalue.end(), 0x20); + EXPECT_EQ(test_write(0, testvalue.data(), testvalue.size()), WEAR_LEVELING_CONSOLIDATED) << "Write returned incorrect status"; + uint8_t dummy = 0x40; + EXPECT_EQ(test_write(0x04, &dummy, sizeof(dummy)), WEAR_LEVELING_SUCCESS) << "Write returned incorrect status"; + + // Expected log: + // [0,1]: multibyte, 5 bytes, backing address 0x18, logical address 0x00 + // [2,3]: multibyte, 5 bytes, backing address 0x20, logical address 0x05 + // [4,5]: multibyte, 5 bytes, backing address 0x28, logical address 0x0A, triggers consolidation + // [6]: erase + // [7,8]: consolidated data, backing address 0x00, logical address 0x00 + // [9,10]: consolidated data, backing address 0x08, logical address 0x08 + // [11,12]: FNV1a_64 result, backing address 0x10 + // [13]: multibyte, 1 byte, backing address 0x18, logical address 0x04 + EXPECT_EQ(std::distance(inst.log_begin(), inst.log_end()), 14); + + // Verify the backing store writes for the write log + std::size_t index; + write_log_entry_t e; + for (index = 0; index < 6; ++index) { + auto write_iter = inst.log_begin() + index; + EXPECT_EQ(write_iter->address, WEAR_LEVELING_LOGICAL_SIZE + 8 + (index * BACKING_STORE_WRITE_SIZE)) << "Invalid write log address"; + + // If this is the backing store write that contains the metadata, verify it + if (index % 2 == 0) { + write_log_entry_t e; + e.raw64 = write_iter->value; + EXPECT_EQ(LOG_ENTRY_GET_TYPE(e), LOG_ENTRY_TYPE_MULTIBYTE) << "Invalid write log entry type"; + } + } + + // Verify the backing store erase + { + index = 6; + auto write_iter = inst.log_begin() + index; + e.raw64 = write_iter->value; + EXPECT_TRUE(write_iter->erased) << "Backing store erase did not occur as required"; + } + + // Verify the backing store writes for consolidation + for (index = 7; index < 11; ++index) { + auto write_iter = inst.log_begin() + index; + EXPECT_EQ(write_iter->address, (index - 7) * BACKING_STORE_WRITE_SIZE) << "Invalid write log entry address"; + } + + // Verify the FNV1a_64 write + { + EXPECT_EQ((inst.log_begin() + 11)->address, WEAR_LEVELING_LOGICAL_SIZE) << "Invalid write log address"; + e.raw32[0] = (inst.log_begin() + 11)->value; + e.raw32[1] = (inst.log_begin() + 12)->value; + EXPECT_EQ(e.raw64, fnv_64a_buf(testvalue.data(), testvalue.size(), FNV1A_64_INIT)) << "Invalid checksum"; // Note that checksum is based on testvalue, as we overwrote one byte and need to consult the consolidated data, not the current + } + + // Verify the final write + EXPECT_EQ((inst.log_begin() + 13)->address, WEAR_LEVELING_LOGICAL_SIZE + 8) << "Invalid write log address"; + + // Verify the data is what we expected + std::array<std::uint8_t, WEAR_LEVELING_LOGICAL_SIZE> readback; + EXPECT_EQ(wear_leveling_read(0, readback.data(), WEAR_LEVELING_LOGICAL_SIZE), WEAR_LEVELING_SUCCESS) << "Failed to read back the saved data"; + EXPECT_TRUE(memcmp(readback.data(), verify_data.data(), WEAR_LEVELING_LOGICAL_SIZE) == 0) << "Readback did not match"; + + // Re-init and re-read, verifying the reload capability + EXPECT_NE(wear_leveling_init(), WEAR_LEVELING_FAILED) << "Re-initialisation failed"; + EXPECT_EQ(wear_leveling_read(0, readback.data(), WEAR_LEVELING_LOGICAL_SIZE), WEAR_LEVELING_SUCCESS) << "Failed to read back the saved data"; + EXPECT_TRUE(memcmp(readback.data(), verify_data.data(), WEAR_LEVELING_LOGICAL_SIZE) == 0) << "Readback did not match"; +} + +/** + * This test verifies multibyte readback gets canceled with an out-of-bounds address. + */ +TEST_F(WearLeveling4Byte, PlaybackReadbackMultibyte_OOB) { + auto& inst = MockBackingStore::Instance(); + auto logstart = inst.storage_begin() + (WEAR_LEVELING_LOGICAL_SIZE / sizeof(backing_store_int_t)); + + // Invalid FNV1a_64 hash + (logstart + 0)->set(0); + (logstart + 1)->set(0); + + // Set up a 2-byte logical write of [0x11,0x12] at logical offset 0x01 + auto entry0 = LOG_ENTRY_MAKE_MULTIBYTE(0x01, 2); + entry0.raw8[3] = 0x11; + entry0.raw8[4] = 0x12; + (logstart + 2)->set(~entry0.raw32[0]); + (logstart + 3)->set(~entry0.raw32[1]); + + // Set up a 2-byte logical write of [0x13,0x14] at logical offset 0x1000 (out of bounds) + auto entry1 = LOG_ENTRY_MAKE_MULTIBYTE(0x1000, 2); + entry1.raw8[3] = 0x13; + entry1.raw8[4] = 0x14; + (logstart + 4)->set(~entry1.raw32[0]); + (logstart + 5)->set(~entry1.raw32[1]); + + // Set up a 2-byte logical write of [0x15,0x16] at logical offset 0x10 + auto entry2 = LOG_ENTRY_MAKE_MULTIBYTE(0x01, 2); + entry2.raw8[3] = 0x15; + entry2.raw8[4] = 0x16; + (logstart + 6)->set(~entry2.raw32[0]); + (logstart + 7)->set(~entry2.raw32[1]); + + EXPECT_EQ(inst.erasure_count(), 0) << "Invalid initial erase count"; + EXPECT_EQ(wear_leveling_init(), WEAR_LEVELING_CONSOLIDATED) << "Readback should have failed and triggered consolidation"; + EXPECT_EQ(inst.erasure_count(), 1) << "Invalid final erase count"; + + uint8_t buf[2]; + wear_leveling_read(0x01, buf, sizeof(buf)); + EXPECT_EQ(buf[0], 0x11) << "Readback should have maintained the previous pre-failure value from the write log"; + EXPECT_EQ(buf[1], 0x12) << "Readback should have maintained the previous pre-failure value from the write log"; +} |