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authorDan Williams <dan.j.williams@intel.com>2018-05-01 06:49:45 -0700
committerDan Williams <dan.j.williams@intel.com>2018-05-22 23:18:31 -0700
commit5d8beee20d89e34ff1dcb0da84adf7607858c59d (patch)
tree8ec057691e285c7244b82bc47b077fa0ce50fae5 /tools/testing/nvdimm
parentpmem: Switch to copy_to_iter_mcsafe() (diff)
downloadlinux-dev-5d8beee20d89e34ff1dcb0da84adf7607858c59d.tar.xz
linux-dev-5d8beee20d89e34ff1dcb0da84adf7607858c59d.zip
x86, nfit_test: Add unit test for memcpy_mcsafe()
Given the fact that the ACPI "EINJ" (error injection) facility is not universally available, implement software infrastructure to validate the memcpy_mcsafe() exception handling implementation. For each potential read exception point in memcpy_mcsafe(), inject a emulated exception point at the address identified by 'mcsafe_inject' variable. With this infrastructure implement a test to validate that the 'bytes remaining' calculation is correct for a range of various source buffer alignments. This code is compiled out by default. The CONFIG_MCSAFE_DEBUG configuration symbol needs to be manually enabled by editing Kconfig.debug. I.e. this functionality can not be accidentally enabled by a user / distro, it's only for development. Cc: <x86@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Reported-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'tools/testing/nvdimm')
-rw-r--r--tools/testing/nvdimm/test/nfit.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/tools/testing/nvdimm/test/nfit.c b/tools/testing/nvdimm/test/nfit.c
index 4ea385be528f..a8fb63edcf89 100644
--- a/tools/testing/nvdimm/test/nfit.c
+++ b/tools/testing/nvdimm/test/nfit.c
@@ -29,6 +29,8 @@
#include "nfit_test.h"
#include "../watermark.h"
+#include <asm/mcsafe_test.h>
+
/*
* Generate an NFIT table to describe the following topology:
*
@@ -2681,6 +2683,107 @@ static struct platform_driver nfit_test_driver = {
.id_table = nfit_test_id,
};
+static char mcsafe_buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
+
+enum INJECT {
+ INJECT_NONE,
+ INJECT_SRC,
+ INJECT_DST,
+};
+
+static void mcsafe_test_init(char *dst, char *src, size_t size)
+{
+ size_t i;
+
+ memset(dst, 0xff, size);
+ for (i = 0; i < size; i++)
+ src[i] = (char) i;
+}
+
+static bool mcsafe_test_validate(unsigned char *dst, unsigned char *src,
+ size_t size, unsigned long rem)
+{
+ size_t i;
+
+ for (i = 0; i < size - rem; i++)
+ if (dst[i] != (unsigned char) i) {
+ pr_info_once("%s:%d: offset: %zd got: %#x expect: %#x\n",
+ __func__, __LINE__, i, dst[i],
+ (unsigned char) i);
+ return false;
+ }
+ for (i = size - rem; i < size; i++)
+ if (dst[i] != 0xffU) {
+ pr_info_once("%s:%d: offset: %zd got: %#x expect: 0xff\n",
+ __func__, __LINE__, i, dst[i]);
+ return false;
+ }
+ return true;
+}
+
+void mcsafe_test(void)
+{
+ char *inject_desc[] = { "none", "source", "destination" };
+ enum INJECT inj;
+
+ if (IS_ENABLED(CONFIG_MCSAFE_TEST)) {
+ pr_info("%s: run...\n", __func__);
+ } else {
+ pr_info("%s: disabled, skip.\n", __func__);
+ return;
+ }
+
+ for (inj = INJECT_NONE; inj <= INJECT_DST; inj++) {
+ int i;
+
+ pr_info("%s: inject: %s\n", __func__, inject_desc[inj]);
+ for (i = 0; i < 512; i++) {
+ unsigned long expect, rem;
+ void *src, *dst;
+ bool valid;
+
+ switch (inj) {
+ case INJECT_NONE:
+ mcsafe_inject_src(NULL);
+ mcsafe_inject_dst(NULL);
+ dst = &mcsafe_buf[2048];
+ src = &mcsafe_buf[1024 - i];
+ expect = 0;
+ break;
+ case INJECT_SRC:
+ mcsafe_inject_src(&mcsafe_buf[1024]);
+ mcsafe_inject_dst(NULL);
+ dst = &mcsafe_buf[2048];
+ src = &mcsafe_buf[1024 - i];
+ expect = 512 - i;
+ break;
+ case INJECT_DST:
+ mcsafe_inject_src(NULL);
+ mcsafe_inject_dst(&mcsafe_buf[2048]);
+ dst = &mcsafe_buf[2048 - i];
+ src = &mcsafe_buf[1024];
+ expect = 512 - i;
+ break;
+ }
+
+ mcsafe_test_init(dst, src, 512);
+ rem = __memcpy_mcsafe(dst, src, 512);
+ valid = mcsafe_test_validate(dst, src, 512, expect);
+ if (rem == expect && valid)
+ continue;
+ pr_info("%s: copy(%#lx, %#lx, %d) off: %d rem: %ld %s expect: %ld\n",
+ __func__,
+ ((unsigned long) dst) & ~PAGE_MASK,
+ ((unsigned long ) src) & ~PAGE_MASK,
+ 512, i, rem, valid ? "valid" : "bad",
+ expect);
+ }
+ }
+
+ mcsafe_inject_src(NULL);
+ mcsafe_inject_dst(NULL);
+}
+
static __init int nfit_test_init(void)
{
int rc, i;
@@ -2689,6 +2792,7 @@ static __init int nfit_test_init(void)
libnvdimm_test();
acpi_nfit_test();
device_dax_test();
+ mcsafe_test();
nfit_test_setup(nfit_test_lookup, nfit_test_evaluate_dsm);