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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* test_page_cache.cc — Self-tests for the page cache hash table
*
* Tests: insert, get, remove, duplicate insert, invalidate,
* get_or_alloc, null args.
*/
#include <lume/selftest.h>
#include <lume/page_cache.h>
#include <lume/page.h>
#include <lume/pmm.h>
#include <lume/errno.h>
void selftest_page_cache()
{
/* Use sentinel pointers as fake "mapping" identifiers.
* These are never dereferenced — only used as hash keys. */
int mapping_a_tag = 0;
int mapping_b_tag = 0;
void* mapping_a = &mapping_a_tag;
void* mapping_b = &mapping_b_tag;
/* ---- insert and get ---- */
st_begin("page_cache: insert then get returns same page");
{
Page* page = pmm_alloc_page();
ST_ASSERT(page != nullptr);
int ret = page_cache_insert(mapping_a, 0, page);
ST_ASSERT_EQ(ret, 0);
Page* got = page_cache_get(mapping_a, 0);
ST_ASSERT_EQ(got, page);
/* put the reference from get */
page_cache_put(got);
/* Clean up */
page_cache_remove(mapping_a, 0);
pmm_free_page(page);
}
st_pass();
/* ---- get nonexistent returns nullptr ---- */
st_begin("page_cache: get nonexistent returns nullptr");
{
Page* got = page_cache_get(mapping_a, 99999);
ST_ASSERT(got == nullptr);
}
st_pass();
/* ---- duplicate insert returns -EEXIST ---- */
st_begin("page_cache: duplicate insert returns -EEXIST");
{
Page* page = pmm_alloc_page();
ST_ASSERT(page != nullptr);
int ret1 = page_cache_insert(mapping_a, 1, page);
ST_ASSERT_EQ(ret1, 0);
Page* page2 = pmm_alloc_page();
ST_ASSERT(page2 != nullptr);
int ret2 = page_cache_insert(mapping_a, 1, page2);
ST_ASSERT_EQ(ret2, -EEXIST);
/* Clean up */
page_cache_remove(mapping_a, 1);
pmm_free_page(page);
pmm_free_page(page2);
}
st_pass();
/* ---- remove returns page ---- */
st_begin("page_cache: remove returns page and deletes entry");
{
Page* page = pmm_alloc_page();
ST_ASSERT(page != nullptr);
page_cache_insert(mapping_a, 2, page);
Page* removed = page_cache_remove(mapping_a, 2);
ST_ASSERT_EQ(removed, page);
/* Should be gone now */
Page* got = page_cache_get(mapping_a, 2);
ST_ASSERT(got == nullptr);
pmm_free_page(page);
}
st_pass();
/* ---- remove nonexistent returns nullptr ---- */
st_begin("page_cache: remove nonexistent returns nullptr");
{
Page* got = page_cache_remove(mapping_a, 77777);
ST_ASSERT(got == nullptr);
}
st_pass();
/* ---- different mappings are independent ---- */
st_begin("page_cache: different mappings are independent");
{
Page* pa = pmm_alloc_page();
Page* pb = pmm_alloc_page();
ST_ASSERT(pa != nullptr);
ST_ASSERT(pb != nullptr);
page_cache_insert(mapping_a, 5, pa);
page_cache_insert(mapping_b, 5, pb);
Page* got_a = page_cache_get(mapping_a, 5);
Page* got_b = page_cache_get(mapping_b, 5);
ST_ASSERT_EQ(got_a, pa);
ST_ASSERT_EQ(got_b, pb);
ST_ASSERT_NE(got_a, got_b);
page_cache_put(got_a);
page_cache_put(got_b);
page_cache_remove(mapping_a, 5);
page_cache_remove(mapping_b, 5);
pmm_free_page(pa);
pmm_free_page(pb);
}
st_pass();
/* ---- invalidate removes all entries for a mapping ---- */
st_begin("page_cache: invalidate removes all entries for mapping");
{
Page* pages[4];
for (int i = 0; i < 4; i++) {
pages[i] = pmm_alloc_page();
ST_ASSERT(pages[i] != nullptr);
page_cache_insert(mapping_a, 10 + i, pages[i]);
}
/* Also insert one for mapping_b */
Page* pb = pmm_alloc_page();
page_cache_insert(mapping_b, 10, pb);
/* Invalidate mapping_a */
page_cache_invalidate(mapping_a);
/* All mapping_a entries should be gone */
for (int i = 0; i < 4; i++) {
Page* got = page_cache_get(mapping_a, 10 + i);
ST_ASSERT(got == nullptr);
pmm_free_page(pages[i]);
}
/* mapping_b should still be there */
Page* got_b = page_cache_get(mapping_b, 10);
ST_ASSERT_EQ(got_b, pb);
page_cache_put(got_b);
page_cache_remove(mapping_b, 10);
pmm_free_page(pb);
}
st_pass();
/* ---- insert null mapping returns -EINVAL ---- */
st_begin("page_cache: insert null mapping returns -EINVAL");
{
Page* page = pmm_alloc_page();
int ret = page_cache_insert(nullptr, 0, page);
ST_ASSERT_EQ(ret, -EINVAL);
pmm_free_page(page);
}
st_pass();
/* ---- insert null page returns -EINVAL ---- */
st_begin("page_cache: insert null page returns -EINVAL");
{
int ret = page_cache_insert(mapping_a, 0, nullptr);
ST_ASSERT_EQ(ret, -EINVAL);
}
st_pass();
}
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