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spi_flash: Remove 16KB free internal heap limit for esp_flash_read() into PSRAM

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Allocation of the temporary internal buffer will now repeat until a small enough buffer can be
allocated, and only fail if less than a 256 byte block of internal RAM is free.

Adds unit test for the same, and generic test utility for creating memory pressure.
This commit is contained in:
Angus Gratton
2020-02-27 11:57:00 +11:00
committed by Angus Gratton
parent af4c6ac0f3
commit c38c3ff3f0
4 changed files with 136 additions and 18 deletions
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38
tools/unit-test-app/components/test_utils/test_utils.c
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@@ -143,3 +143,41 @@ size_t test_utils_get_leak_level(esp_type_leak_t type_of_leak, esp_comp_leak_t c
}
return leak_level;
}
#define EXHAUST_MEMORY_ENTRIES 100
struct test_utils_exhaust_memory_record_s {
int *entries[EXHAUST_MEMORY_ENTRIES];
};
test_utils_exhaust_memory_rec test_utils_exhaust_memory(uint32_t caps, size_t limit)
{
int idx = 0;
test_utils_exhaust_memory_rec rec = calloc(1, sizeof(struct test_utils_exhaust_memory_record_s));
TEST_ASSERT_NOT_NULL_MESSAGE(rec, "test_utils_exhaust_memory: not enough free memory to allocate record structure!");
while (idx < EXHAUST_MEMORY_ENTRIES) {
size_t free_caps = heap_caps_get_largest_free_block(caps);
if (free_caps <= limit) {
return rec; // done!
}
rec->entries[idx] = heap_caps_malloc(free_caps - limit, caps);
TEST_ASSERT_NOT_NULL_MESSAGE(rec->entries[idx],
"test_utils_exhaust_memory: something went wrong while freeing up memory, is another task using heap?");
heap_caps_check_integrity_all(true);
idx++;
}
TEST_FAIL_MESSAGE("test_utils_exhaust_memory: The heap with the requested caps is too fragmented, increase EXHAUST_MEMORY_ENTRIES or defrag the heap!");
abort();
}
void test_utils_free_exhausted_memory(test_utils_exhaust_memory_rec rec)
{
for (int i = 0; i < EXHAUST_MEMORY_ENTRIES; i++) {
free(rec->entries[i]);
}
free(rec);
}