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Message-ID: <20250731201009.888945-1-sudarsanm@google.com>
Date: Thu, 31 Jul 2025 13:10:09 -0700
From: Sudarsan Mahendran <sudarsanm@...gle.com>
To: linux-kselftest@...r.kernel.org, David Hildenbrand <david@...hat.com>
Cc: Shuah Khan <shuah@...nel.org>, Axel Rasmussen <axelrasmussen@...gle.com>, linux-mm@...ck.org,
Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
trivial@...nel.org, Sudarsan Mahendran <sudarsanm@...gle.com>
Subject: [PATCH] selftests/mm: pass filename as input param to VM_PFNMAP tests
Enable these tests to be run on other pfnmap'ed memory like
NVIDIA's EGM.
Add '--' as a separator to pass in file path. This allows
passing of cmd line arguments to kselftest_harness.
Use '/dev/mem' as default filename.
Existing test passes:
pfnmap
TAP version 13
1..6
# Starting 6 tests from 1 test cases.
# PASSED: 6 / 6 tests passed.
# Totals: pass:6 fail:0 xfail:0 xpass:0 skip:0 error:0
Pass params to kselftest_harness:
pfnmap -r pfnmap:mremap_fixed
TAP version 13
1..1
# Starting 1 tests from 1 test cases.
# RUN pfnmap.mremap_fixed ...
# OK pfnmap.mremap_fixed
ok 1 pfnmap.mremap_fixed
# PASSED: 1 / 1 tests passed.
# Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
Pass random file name as input:
pfnmap -- /dev/blah
TAP version 13
1..6
# Starting 6 tests from 1 test cases.
# RUN pfnmap.madvise_disallowed ...
# SKIP Cannot open '/dev/blah'
Signed-off-by: Sudarsan Mahendran <sudarsanm@...gle.com>
---
tools/testing/selftests/mm/pfnmap.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/mm/pfnmap.c b/tools/testing/selftests/mm/pfnmap.c
index 866ac023baf5..2d4e8b165f91 100644
--- a/tools/testing/selftests/mm/pfnmap.c
+++ b/tools/testing/selftests/mm/pfnmap.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Basic VM_PFNMAP tests relying on mmap() of '/dev/mem'
+ * Basic VM_PFNMAP tests relying on mmap() of input file provided.
+ * Use '/dev/mem' as default.
*
* Copyright 2025, Red Hat, Inc.
*
@@ -25,6 +26,7 @@
#include "vm_util.h"
static sigjmp_buf sigjmp_buf_env;
+static char *file = "/dev/mem";
static void signal_handler(int sig)
{
@@ -117,19 +119,19 @@ FIXTURE_SETUP(pfnmap)
if (find_ram_target(&self->phys_addr, self->pagesize))
SKIP(return, "Cannot find ram target in '/proc/iomem'\n");
- self->dev_mem_fd = open("/dev/mem", O_RDONLY);
+ self->dev_mem_fd = open(file, O_RDONLY);
if (self->dev_mem_fd < 0)
- SKIP(return, "Cannot open '/dev/mem'\n");
+ SKIP(return, "Cannot open '%s'\n", file);
self->size1 = self->pagesize * 2;
self->addr1 = mmap(NULL, self->size1, PROT_READ, MAP_SHARED,
self->dev_mem_fd, self->phys_addr);
if (self->addr1 == MAP_FAILED)
- SKIP(return, "Cannot mmap '/dev/mem'\n");
+ SKIP(return, "Cannot mmap '%s'\n", file);
/* ... and want to be able to read from them. */
if (test_read_access(self->addr1, self->size1, self->pagesize))
- SKIP(return, "Cannot read-access mmap'ed '/dev/mem'\n");
+ SKIP(return, "Cannot read-access mmap'ed '%s'\n", file);
self->size2 = 0;
self->addr2 = MAP_FAILED;
@@ -246,4 +248,14 @@ TEST_F(pfnmap, fork)
ASSERT_EQ(ret, 0);
}
-TEST_HARNESS_MAIN
+int main(int argc, char **argv)
+{
+ for (int i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "--") == 0) {
+ if (i + 1 < argc && strlen(argv[i + 1]) > 0)
+ file = argv[i + 1];
+ return test_harness_run(i, argv);
+ }
+ }
+ return test_harness_run(argc, argv);
+}
--
2.50.1.565.gc32cd1483b-goog
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