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129 lines
3.4 KiB
129 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/** |
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* imr_selftest.c -- Intel Isolated Memory Region self-test driver |
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* |
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* Copyright(c) 2013 Intel Corporation. |
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* Copyright(c) 2015 Bryan O'Donoghue <[email protected]> |
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* |
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* IMR self test. The purpose of this module is to run a set of tests on the |
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* IMR API to validate it's sanity. We check for overlapping, reserved |
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* addresses and setup/teardown sanity. |
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* |
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*/ |
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#include <asm-generic/sections.h> |
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#include <asm/cpu_device_id.h> |
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#include <asm/imr.h> |
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#include <asm/io.h> |
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#include <linux/init.h> |
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#include <linux/mm.h> |
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#include <linux/types.h> |
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#define SELFTEST KBUILD_MODNAME ": " |
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/** |
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* imr_self_test_result - Print result string for self test. |
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* |
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* @res: result code - true if test passed false otherwise. |
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* @fmt: format string. |
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* ... variadic argument list. |
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*/ |
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static __printf(2, 3) |
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void __init imr_self_test_result(int res, const char *fmt, ...) |
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{ |
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va_list vlist; |
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/* Print pass/fail. */ |
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if (res) |
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pr_info(SELFTEST "pass "); |
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else |
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pr_info(SELFTEST "fail "); |
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/* Print variable string. */ |
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va_start(vlist, fmt); |
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vprintk(fmt, vlist); |
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va_end(vlist); |
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/* Optional warning. */ |
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WARN(res == 0, "test failed"); |
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} |
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#undef SELFTEST |
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/** |
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* imr_self_test |
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* |
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* Verify IMR self_test with some simple tests to verify overlap, |
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* zero sized allocations and 1 KiB sized areas. |
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* |
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*/ |
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static void __init imr_self_test(void) |
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{ |
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phys_addr_t base = virt_to_phys(&_text); |
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size_t size = virt_to_phys(&__end_rodata) - base; |
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const char *fmt_over = "overlapped IMR @ (0x%08lx - 0x%08lx)\n"; |
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int ret; |
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/* Test zero zero. */ |
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ret = imr_add_range(0, 0, 0, 0); |
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imr_self_test_result(ret < 0, "zero sized IMR\n"); |
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/* Test exact overlap. */ |
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ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); |
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imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
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/* Test overlap with base inside of existing. */ |
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base += size - IMR_ALIGN; |
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ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); |
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imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
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/* Test overlap with end inside of existing. */ |
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base -= size + IMR_ALIGN * 2; |
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ret = imr_add_range(base, size, IMR_CPU, IMR_CPU); |
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imr_self_test_result(ret < 0, fmt_over, __va(base), __va(base + size)); |
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/* Test that a 1 KiB IMR @ zero with read/write all will bomb out. */ |
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ret = imr_add_range(0, IMR_ALIGN, IMR_READ_ACCESS_ALL, |
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IMR_WRITE_ACCESS_ALL); |
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imr_self_test_result(ret < 0, "1KiB IMR @ 0x00000000 - access-all\n"); |
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/* Test that a 1 KiB IMR @ zero with CPU only will work. */ |
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ret = imr_add_range(0, IMR_ALIGN, IMR_CPU, IMR_CPU); |
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imr_self_test_result(ret >= 0, "1KiB IMR @ 0x00000000 - cpu-access\n"); |
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if (ret >= 0) { |
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ret = imr_remove_range(0, IMR_ALIGN); |
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imr_self_test_result(ret == 0, "teardown - cpu-access\n"); |
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} |
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/* Test 2 KiB works. */ |
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size = IMR_ALIGN * 2; |
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ret = imr_add_range(0, size, IMR_READ_ACCESS_ALL, IMR_WRITE_ACCESS_ALL); |
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imr_self_test_result(ret >= 0, "2KiB IMR @ 0x00000000\n"); |
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if (ret >= 0) { |
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ret = imr_remove_range(0, size); |
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imr_self_test_result(ret == 0, "teardown 2KiB\n"); |
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} |
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} |
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static const struct x86_cpu_id imr_ids[] __initconst = { |
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X86_MATCH_VENDOR_FAM_MODEL(INTEL, 5, INTEL_FAM5_QUARK_X1000, NULL), |
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{} |
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}; |
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/** |
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* imr_self_test_init - entry point for IMR driver. |
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* |
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* return: -ENODEV for no IMR support 0 if good to go. |
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*/ |
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static int __init imr_self_test_init(void) |
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{ |
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if (x86_match_cpu(imr_ids)) |
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imr_self_test(); |
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return 0; |
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} |
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/** |
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* imr_self_test_exit - exit point for IMR code. |
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* |
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* return: |
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*/ |
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device_initcall(imr_self_test_init);
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