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// 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";
}
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