| // SPDX-License-Identifier: GPL-2.0 |
| /** |
| * imr_selftest.c -- Intel Isolated Memory Region self-test driver |
| * |
| * Copyright(c) 2013 Intel Corporation. |
| * Copyright(c) 2015 Bryan O'Donoghue <pure.logic@nexus-software.ie> |
| * |
| * IMR self test. The purpose of this module is to run a set of tests on the |
| * IMR API to validate it's sanity. We check for overlapping, reserved |
| * addresses and setup/teardown sanity. |
| * |
| */ |
| |
| #include <asm-generic/sections.h> |
| #include <asm/cpu_device_id.h> |
| #include <asm/imr.h> |
| #include <asm/io.h> |
| |
| #include <linux/init.h> |
| #include <linux/mm.h> |
| #include <linux/types.h> |
| |
| #define SELFTEST KBUILD_MODNAME ": " |
| /** |
| * imr_self_test_result - Print result string for self test. |
| * |
| * @res: result code - true if test passed false otherwise. |
| * @fmt: format string. |
| * ... variadic argument list. |
| */ |
| static __printf(2, 3) |
| void __init imr_self_test_result(int res, const char *fmt, ...) |
| { |
| va_list vlist; |
| |
| /* Print pass/fail. */ |
| if (res) |
| pr_info(SELFTEST "pass "); |
| else |
| pr_info(SELFTEST "fail "); |
| |
| /* Print variable string. */ |
| va_start(vlist, fmt); |
| vprintk(fmt, vlist); |
| va_end(vlist); |
| |
| /* Optional warning. */ |
| WARN(res == 0, "test failed"); |
| } |
| #undef SELFTEST |
| |
| /** |
| * imr_self_test |
| * |
| * Verify IMR self_test with some simple tests to verify overlap, |
| * zero sized allocations and 1 KiB sized areas. |
| * |
| */ |
| static void __init imr_self_test(void) |
| { |
| phys_addr_t base = virt_to_phys(&_text); |
| size_t size = virt_to_phys(&__end_rodata) - base; |
| const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n"; |
| int ret; |
| |
| /* Test zero zero. */ |
| ret = imr_add_range(0, 0, 0, 0); |
| imr_self_test_result(ret < 0, "zero sized IMR\n"); |
| |
| /* Test exact overlap. */ |
| ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); |
| imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
| |
| /* Test overlap with base inside of existing. */ |
| base += size - IMR_ALIGN; |
| ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); |
| imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
| |
| /* Test overlap with end inside of existing. */ |
| base -= size + IMR_ALIGN * 2; |
| ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); |
| imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
| |
| /* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */ |
| ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL, |
| IMR_WRITE_ACCESS_ALL); |
| imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n"); |
| |
| /* Test that a 1 KiB IMR @ zero with CPU only will work. */ |
| ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU); |
| imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n"); |
| if (ret >= 0) { |
| ret = imr_remove_range(0, IMR_ALIGN); |
| imr_self_test_result(ret == 0, "teardown - cpu-access\n"); |
| } |
| |
| /* Test 2 KiB works. */ |
| size = IMR_ALIGN * 2; |
| ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, IMR_WRITE_ACCESS_ALL); |
| imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n"); |
| if (ret >= 0) { |
| ret = imr_remove_range(0, size); |
| imr_self_test_result(ret == 0, "teardown 2KiB\n"); |
| } |
| } |
| |
| static const struct x86_cpu_id imr_ids[] __initconst = { |
| { X86_VENDOR_INTEL, 5, 9 }, /* Intel Quark SoC X1000. */ |
| {} |
| }; |
| |
| /** |
| * imr_self_test_init - entry point for IMR driver. |
| * |
| * return: -ENODEV for no IMR support 0 if good to go. |
| */ |
| static int __init imr_self_test_init(void) |
| { |
| if (x86_match_cpu(imr_ids)) |
| imr_self_test(); |
| return 0; |
| } |
| |
| /** |
| * imr_self_test_exit - exit point for IMR code. |
| * |
| * return: |
| */ |
| device_initcall(imr_self_test_init); |