Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 127 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..42f879b75
--- /dev/null
+++ b/arch/x86/platform/intel-quark/imr_selftest.c
@@ -0,0 +1,127 @@
+// 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 <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);