From 940acf65a61595e8c0db3aebe1c74307acbbef68 Mon Sep 17 00:00:00 2001

From: Dan Williams <dan.j.williams@intel.com>

Date: Tue, 12 Jan 2021 23:15:14 -0800

Subject: [PATCH 006/217] ndctl/test: Exercise soft_offline_page() corner cases

Test soft-offline injection into PMEM namespace metadata and user mapped

space. Both attempts should fail on kernels with a pfn_to_online_page()

implementation that considers subsection ZONE_DEVICE ranges.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>

Link: https://lore.kernel.org/r/161052211455.1804207.13884321454837200896.stgit@dwillia2-desk3.amr.corp.intel.com

---

 test/dax-poison.c | 19 +++++++++++++++++++

 test/device-dax.c | 45 +++++++++++++++++++++++++++++++++++++++++++++

 2 files changed, 64 insertions(+)

diff --git a/test/dax-poison.c b/test/dax-poison.c

index a4ef12e..4e09761 100644

--- a/test/dax-poison.c

+++ b/test/dax-poison.c

@@ -5,6 +5,7 @@

 #include <signal.h>

 #include <setjmp.h>

 #include <sys/mman.h>

+#include <linux/mman.h>

 #include <fcntl.h>

 #include <string.h>

 #include <errno.h>

@@ -49,6 +50,7 @@ int test_dax_poison(struct ndctl_test *test, int dax_fd, unsigned long align,

 	unsigned char *addr = MAP_FAILED;

 	struct sigaction act;

 	unsigned x = x;

+	FILE *smaps;

 	void *buf;

 	int rc;

@@ -94,6 +96,9 @@ int test_dax_poison(struct ndctl_test *test, int dax_fd, unsigned long align,

 		goto out;

 	}

+	fprintf(stderr, "%s: mmap got %p align: %ld offset: %zd\n",

+			__func__, addr, align, offset);

+

 	if (sigsetjmp(sj_env, 1)) {

 		if (sig_mcerr_ar) {

 			fprintf(stderr, "madvise triggered 'action required' sigbus\n");

@@ -104,6 +109,20 @@ int test_dax_poison(struct ndctl_test *test, int dax_fd, unsigned long align,

 		}

 	}

+	rc = madvise(addr + align / 2, 4096, MADV_SOFT_OFFLINE);

+	if (rc == 0) {

+		fprintf(stderr, "softoffline should always fail for dax\n");

+		smaps = fopen("/proc/self/smaps", "r");

+		do {

+			rc = fread(buf, 1, 4096, smaps);

+			fwrite(buf, 1, rc, stderr);

+		} while (rc);

+		fclose(smaps);

+		fail();

+		rc = -ENXIO;

+		goto out;

+	}

+

 	rc = madvise(addr + align / 2, 4096, MADV_HWPOISON);

 	if (rc) {

 		fail();

diff --git a/test/device-dax.c b/test/device-dax.c

index 5f0da29..aad8fa5 100644

--- a/test/device-dax.c

+++ b/test/device-dax.c

@@ -128,6 +128,44 @@ static int verify_data(struct daxctl_dev *dev, char *dax_buf,

 	return 0;

 }

+static int test_dax_soft_offline(struct ndctl_test *test, struct ndctl_namespace *ndns)

+{

+	unsigned long long resource = ndctl_namespace_get_resource(ndns);

+	int fd, rc;

+	char *buf;

+

+	if (resource == ULLONG_MAX) {

+		fprintf(stderr, "failed to get resource: %s\n",

+				ndctl_namespace_get_devname(ndns));

+		return -ENXIO;

+	}

+

+	fd = open("/sys/devices/system/memory/soft_offline_page", O_WRONLY);

+	if (fd < 0) {

+		fprintf(stderr, "failed to open soft_offline_page\n");

+		return -ENOENT;

+	}

+

+	rc = asprintf(&buf, "%#llx\n", resource);

+	if (rc < 0) {

+		fprintf(stderr, "failed to alloc resource\n");

+		close(fd);

+		return -ENOMEM;

+	}

+

+	fprintf(stderr, "%s: try to offline page @%#llx\n", __func__, resource);

+	rc = write(fd, buf, rc);

+	free(buf);

+	close(fd);

+

+	if (rc >= 0) {

+		fprintf(stderr, "%s: should have failed\n", __func__);

+		return -ENXIO;

+	}

+

+	return 0;

+}

+

 static int __test_device_dax(unsigned long align, int loglevel,

 		struct ndctl_test *test, struct ndctl_ctx *ctx)

 {

@@ -278,6 +316,13 @@ static int __test_device_dax(unsigned long align, int loglevel,

 			goto out;

 		}

+		rc = test_dax_soft_offline(test, ndns);

+		if (rc) {

+			fprintf(stderr, "%s: failed dax soft offline\n",

+					ndctl_namespace_get_devname(ndns));

+			goto out;

+		}

+

 		rc = test_dax_poison(test, fd, align, NULL, 0, devdax);

 		if (rc) {

 			fprintf(stderr, "%s: failed dax poison\n",

-- 

2.27.0