diff options
Diffstat (limited to 'arch/x86/platform/intel-quark/imr_selftest.c')
| -rw-r--r-- | arch/x86/platform/intel-quark/imr_selftest.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/arch/x86/platform/intel-quark/imr_selftest.c b/arch/x86/platform/intel-quark/imr_selftest.c new file mode 100644 index 000000000..570e3062f --- /dev/null +++ b/arch/x86/platform/intel-quark/imr_selftest.c @@ -0,0 +1,129 @@ +// 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_MATCH_VENDOR_FAM_MODEL(INTEL, 5, INTEL_FAM5_QUARK_X1000, NULL), + {} +}; + +/** + * 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); |