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// SPDX-License-Identifier: GPL-2.0-only
/*
* CPU-agnostic ARM page table allocator.
*
* Copyright (C) 2014 ARM Limited
*
* Author: Will Deacon <will.deacon@arm.com>
*/
#define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt
#include <kunit/device.h>
#include <kunit/test.h>
#include <linux/io-pgtable.h>
#include <linux/kernel.h>
#include "io-pgtable-arm.h"
static struct io_pgtable_cfg *cfg_cookie;
static void dummy_tlb_flush_all(void *cookie)
{
WARN_ON(cookie != cfg_cookie);
}
static void dummy_tlb_flush(unsigned long iova, size_t size,
size_t granule, void *cookie)
{
WARN_ON(cookie != cfg_cookie);
WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
}
static void dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
unsigned long iova, size_t granule,
void *cookie)
{
dummy_tlb_flush(iova, granule, granule, cookie);
}
static const struct iommu_flush_ops dummy_tlb_ops = {
.tlb_flush_all = dummy_tlb_flush_all,
.tlb_flush_walk = dummy_tlb_flush,
.tlb_add_page = dummy_tlb_add_page,
};
#define __FAIL(test, i) ({ \
KUNIT_FAIL(test, "test failed for fmt idx %d\n", (i)); \
-EFAULT; \
})
static int arm_lpae_run_tests(struct kunit *test, struct io_pgtable_cfg *cfg)
{
static const enum io_pgtable_fmt fmts[] = {
ARM_64_LPAE_S1,
ARM_64_LPAE_S2,
};
int i, j;
unsigned long iova;
size_t size, mapped;
struct io_pgtable_ops *ops;
for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
cfg_cookie = cfg;
ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
if (!ops) {
kunit_err(test, "failed to allocate io pgtable ops\n");
return -ENOMEM;
}
/*
* Initial sanity checks.
* Empty page tables shouldn't provide any translations.
*/
if (ops->iova_to_phys(ops, 42))
return __FAIL(test, i);
if (ops->iova_to_phys(ops, SZ_1G + 42))
return __FAIL(test, i);
if (ops->iova_to_phys(ops, SZ_2G + 42))
return __FAIL(test, i);
/*
* Distinct mappings of different granule sizes.
*/
iova = 0;
for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
size = 1UL << j;
if (ops->map_pages(ops, iova, iova, size, 1,
IOMMU_READ | IOMMU_WRITE |
IOMMU_NOEXEC | IOMMU_CACHE,
GFP_KERNEL, &mapped))
return __FAIL(test, i);
/* Overlapping mappings */
if (!ops->map_pages(ops, iova, iova + size, size, 1,
IOMMU_READ | IOMMU_NOEXEC,
GFP_KERNEL, &mapped))
return __FAIL(test, i);
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
return __FAIL(test, i);
iova += SZ_1G;
}
/* Full unmap */
iova = 0;
for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
size = 1UL << j;
if (ops->unmap_pages(ops, iova, size, 1, NULL) != size)
return __FAIL(test, i);
if (ops->iova_to_phys(ops, iova + 42))
return __FAIL(test, i);
/* Remap full block */
if (ops->map_pages(ops, iova, iova, size, 1,
IOMMU_WRITE, GFP_KERNEL, &mapped))
return __FAIL(test, i);
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
return __FAIL(test, i);
iova += SZ_1G;
}
/*
* Map/unmap the last largest supported page of the IAS, this can
* trigger corner cases in the concatednated page tables.
*/
mapped = 0;
size = 1UL << __fls(cfg->pgsize_bitmap);
iova = (1UL << cfg->ias) - size;
if (ops->map_pages(ops, iova, iova, size, 1,
IOMMU_READ | IOMMU_WRITE |
IOMMU_NOEXEC | IOMMU_CACHE,
GFP_KERNEL, &mapped))
return __FAIL(test, i);
if (mapped != size)
return __FAIL(test, i);
if (ops->unmap_pages(ops, iova, size, 1, NULL) != size)
return __FAIL(test, i);
free_io_pgtable_ops(ops);
}
return 0;
}
static void arm_lpae_do_selftests(struct kunit *test)
{
static const unsigned long pgsize[] = {
SZ_4K | SZ_2M | SZ_1G,
SZ_16K | SZ_32M,
SZ_64K | SZ_512M,
};
static const unsigned int address_size[] = {
32, 36, 40, 42, 44, 48,
};
int i, j, k, pass = 0, fail = 0;
struct device *dev;
struct io_pgtable_cfg cfg = {
.tlb = &dummy_tlb_ops,
.coherent_walk = true,
.quirks = IO_PGTABLE_QUIRK_NO_WARN,
};
dev = kunit_device_register(test, "io-pgtable-test");
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, dev);
if (IS_ERR_OR_NULL(dev))
return;
cfg.iommu_dev = dev;
for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
for (j = 0; j < ARRAY_SIZE(address_size); ++j) {
/* Don't use ias > oas as it is not valid for stage-2. */
for (k = 0; k <= j; ++k) {
cfg.pgsize_bitmap = pgsize[i];
cfg.ias = address_size[k];
cfg.oas = address_size[j];
kunit_info(test, "pgsize_bitmap 0x%08lx, IAS %u OAS %u\n",
pgsize[i], cfg.ias, cfg.oas);
if (arm_lpae_run_tests(test, &cfg))
fail++;
else
pass++;
}
}
}
kunit_info(test, "completed with %d PASS %d FAIL\n", pass, fail);
}
static struct kunit_case io_pgtable_arm_test_cases[] = {
KUNIT_CASE(arm_lpae_do_selftests),
{},
};
static struct kunit_suite io_pgtable_arm_test = {
.name = "io-pgtable-arm-test",
.test_cases = io_pgtable_arm_test_cases,
};
kunit_test_suite(io_pgtable_arm_test);
MODULE_DESCRIPTION("io-pgtable-arm library kunit tests");
MODULE_LICENSE("GPL");
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