forked from Minki/linux
c637fa5294
Isolated Memory Regions support a lock bit. The lock bit in an IMR prevents modification of the IMR until the core goes through a warm or cold reset. The lock bit feature is not useful in the context of the kernel API and is not really necessary since modification of IMRs is possible only from ring-zero anyway. This patch drops support for IMR locks bits, it simplifies the kernel API and removes an unnecessary and needlessly complex feature. Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: andriy.shevchenko@linux.intel.com Cc: boon.leong.ong@intel.com Cc: paul.gortmaker@windriver.com Link: http://lkml.kernel.org/r/1456190999-12685-3-git-send-email-pure.logic@nexus-software.ie Signed-off-by: Ingo Molnar <mingo@kernel.org>
126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/**
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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 <pure.logic@nexus-software.ie>
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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 <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 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_VENDOR_INTEL, 5, 9 }, /* Intel Quark SoC X1000. */
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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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