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// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Authors: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
* Authors: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
*/
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include "../kselftest.h"
#ifdef __powerpc64__
#define PAGE_SIZE (64 << 10)
/*
* This will work with 16M and 2M hugepage size
*/
#define HUGETLB_SIZE (16 << 20)
#elif __aarch64__
/*
* The default hugepage size for 64k base pagesize
* is 512MB.
*/
#define PAGE_SIZE (64 << 10)
#define HUGETLB_SIZE (512 << 20)
#else
#define PAGE_SIZE (4 << 10)
#define HUGETLB_SIZE (2 << 20)
#endif
/*
* The hint addr value is used to allocate addresses
* beyond the high address switch boundary.
*/
#define ADDR_MARK_128TB (1UL << 47)
#define ADDR_MARK_256TB (1UL << 48)
#define HIGH_ADDR_128TB ((void *) (1UL << 48))
#define HIGH_ADDR_256TB ((void *) (1UL << 49))
#define LOW_ADDR ((void *) (1UL << 30))
#ifdef __aarch64__
#define ADDR_SWITCH_HINT ADDR_MARK_256TB
#define HIGH_ADDR HIGH_ADDR_256TB
#else
#define ADDR_SWITCH_HINT ADDR_MARK_128TB
#define HIGH_ADDR HIGH_ADDR_128TB
#endif
struct testcase {
void *addr;
unsigned long size;
unsigned long flags;
const char *msg;
unsigned int low_addr_required:1;
unsigned int keep_mapped:1;
};
static struct testcase testcases[] = {
{
/*
* If stack is moved, we could possibly allocate
* this at the requested address.
*/
.addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
.size = PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE)",
.low_addr_required = 1,
},
{
/*
* Unless MAP_FIXED is specified, allocation based on hint
* addr is never at requested address or above it, which is
* beyond high address switch boundary in this case. Instead,
* a suitable allocation is found in lower address space.
*/
.addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, (2 * PAGE_SIZE))",
.low_addr_required = 1,
},
{
/*
* Exact mapping at high address switch boundary, should
* be obtained even without MAP_FIXED as area is free.
*/
.addr = ((void *)(ADDR_SWITCH_HINT)),
.size = PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT, PAGE_SIZE)",
.keep_mapped = 1,
},
{
.addr = (void *)(ADDR_SWITCH_HINT),
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
.msg = "mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED)",
},
{
.addr = NULL,
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(NULL)",
.low_addr_required = 1,
},
{
.addr = LOW_ADDR,
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(LOW_ADDR)",
.low_addr_required = 1,
},
{
.addr = HIGH_ADDR,
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(HIGH_ADDR)",
.keep_mapped = 1,
},
{
.addr = HIGH_ADDR,
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(HIGH_ADDR) again",
.keep_mapped = 1,
},
{
.addr = HIGH_ADDR,
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
.msg = "mmap(HIGH_ADDR, MAP_FIXED)",
},
{
.addr = (void *) -1,
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(-1)",
.keep_mapped = 1,
},
{
.addr = (void *) -1,
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(-1) again",
},
{
.addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
.size = PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE)",
.low_addr_required = 1,
},
{
.addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE),
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2 * PAGE_SIZE)",
.low_addr_required = 1,
.keep_mapped = 1,
},
{
.addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE / 2),
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE/2 , 2 * PAGE_SIZE)",
.low_addr_required = 1,
.keep_mapped = 1,
},
{
.addr = ((void *)(ADDR_SWITCH_HINT)),
.size = PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT, PAGE_SIZE)",
},
{
.addr = (void *)(ADDR_SWITCH_HINT),
.size = 2 * PAGE_SIZE,
.flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
.msg = "mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED)",
},
};
static struct testcase hugetlb_testcases[] = {
{
.addr = NULL,
.size = HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(NULL, MAP_HUGETLB)",
.low_addr_required = 1,
},
{
.addr = LOW_ADDR,
.size = HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(LOW_ADDR, MAP_HUGETLB)",
.low_addr_required = 1,
},
{
.addr = HIGH_ADDR,
.size = HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(HIGH_ADDR, MAP_HUGETLB)",
.keep_mapped = 1,
},
{
.addr = HIGH_ADDR,
.size = HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(HIGH_ADDR, MAP_HUGETLB) again",
.keep_mapped = 1,
},
{
.addr = HIGH_ADDR,
.size = HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
.msg = "mmap(HIGH_ADDR, MAP_FIXED | MAP_HUGETLB)",
},
{
.addr = (void *) -1,
.size = HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(-1, MAP_HUGETLB)",
.keep_mapped = 1,
},
{
.addr = (void *) -1,
.size = HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(-1, MAP_HUGETLB) again",
},
{
.addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE),
.size = 2 * HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
.msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2*HUGETLB_SIZE, MAP_HUGETLB)",
.low_addr_required = 1,
.keep_mapped = 1,
},
{
.addr = (void *)(ADDR_SWITCH_HINT),
.size = 2 * HUGETLB_SIZE,
.flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
.msg = "mmap(ADDR_SWITCH_HINT , 2*HUGETLB_SIZE, MAP_FIXED | MAP_HUGETLB)",
},
};
static int run_test(struct testcase *test, int count)
{
void *p;
int i, ret = KSFT_PASS;
for (i = 0; i < count; i++) {
struct testcase *t = test + i;
p = mmap(t->addr, t->size, PROT_READ | PROT_WRITE, t->flags, -1, 0);
printf("%s: %p - ", t->msg, p);
if (p == MAP_FAILED) {
printf("FAILED\n");
ret = KSFT_FAIL;
continue;
}
if (t->low_addr_required && p >= (void *)(ADDR_SWITCH_HINT)) {
printf("FAILED\n");
ret = KSFT_FAIL;
} else {
/*
* Do a dereference of the address returned so that we catch
* bugs in page fault handling
*/
memset(p, 0, t->size);
printf("OK\n");
}
if (!t->keep_mapped)
munmap(p, t->size);
}
return ret;
}
static int supported_arch(void)
{
#if defined(__powerpc64__)
return 1;
#elif defined(__x86_64__)
return 1;
#elif defined(__aarch64__)
return getpagesize() == PAGE_SIZE;
#else
return 0;
#endif
}
int main(int argc, char **argv)
{
int ret;
if (!supported_arch())
return KSFT_SKIP;
ret = run_test(testcases, ARRAY_SIZE(testcases));
if (argc == 2 && !strcmp(argv[1], "--run-hugetlb"))
ret = run_test(hugetlb_testcases, ARRAY_SIZE(hugetlb_testcases));
return ret;
}
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