linux-kernel - [PATCH v2 2/2] lib/test_vmalloc.c: Add vm_map_ram()/vm_unmap

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Date:   Mon, 27 Mar 2023 18:52:27 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
        Baoquan He <bhe@...hat.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Dave Chinner <david@...morbit.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH v2 2/2] lib/test_vmalloc.c: Add vm_map_ram()/vm_unmap_ram() test case

Add vm_map_ram()/vm_unmap_ram() test case to our stress test-suite.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 lib/test_vmalloc.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c
index cd2bdba6d3ed..6633eda4cd4d 100644
--- a/lib/test_vmalloc.c
+++ b/lib/test_vmalloc.c
@@ -53,6 +53,7 @@ __param(int, run_test_mask, INT_MAX,
 		"\t\tid: 128,  name: pcpu_alloc_test\n"
 		"\t\tid: 256,  name: kvfree_rcu_1_arg_vmalloc_test\n"
 		"\t\tid: 512,  name: kvfree_rcu_2_arg_vmalloc_test\n"
+		"\t\tid: 1024, name: vm_map_ram_test\n"
 		/* Add a new test case description here. */
 );
 
@@ -358,6 +359,45 @@ kvfree_rcu_2_arg_vmalloc_test(void)
 	return 0;
 }
 
+static int
+vm_map_ram_test(void)
+{
+	unsigned int map_nr_pages;
+	unsigned char *v_ptr;
+	unsigned char *p_ptr;
+	struct page **pages;
+	struct page *page;
+	int i;
+
+	map_nr_pages = nr_pages > 0 ? nr_pages:1;
+	pages = kmalloc(map_nr_pages * sizeof(*page), GFP_KERNEL);
+	if (!pages)
+		return -1;
+
+	for (i = 0; i < map_nr_pages; i++) {
+		page = alloc_pages(GFP_KERNEL, 1);
+		if (!page)
+			return -1;
+
+		pages[i] = page;
+	}
+
+	/* Run the test loop. */
+	for (i = 0; i < test_loop_count; i++) {
+		v_ptr = vm_map_ram(pages, map_nr_pages, -1);
+		*v_ptr = 'a';
+		vm_unmap_ram(v_ptr, map_nr_pages);
+	}
+
+	for (i = 0; i < map_nr_pages; i++) {
+		p_ptr = page_address(pages[i]);
+		free_pages((unsigned long)p_ptr, 1);
+	}
+
+	kfree(pages);
+	return 0;
+}
+
 struct test_case_desc {
 	const char *test_name;
 	int (*test_func)(void);
@@ -374,6 +414,7 @@ static struct test_case_desc test_case_array[] = {
 	{ "pcpu_alloc_test", pcpu_alloc_test },
 	{ "kvfree_rcu_1_arg_vmalloc_test", kvfree_rcu_1_arg_vmalloc_test },
 	{ "kvfree_rcu_2_arg_vmalloc_test", kvfree_rcu_2_arg_vmalloc_test },
+	{ "vm_map_ram_test", vm_map_ram_test },
 	/* Add a new test case here. */
 };
 
-- 
2.30.2