linux-kernel - [RFC][PATCH 02/10] x86/mm/cpa: Add ARRAY and PAGES

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Date:   Mon, 03 Dec 2018 18:03:45 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     dave.hansen@...el.com, luto@...nel.org, peterz@...radead.org
Cc:     x86@...nel.org, Tom.StDenis@....com, linux-kernel@...r.kernel.org
Subject: [RFC][PATCH 02/10] x86/mm/cpa: Add ARRAY and PAGES_ARRAY selftests

The current pageattr-test code only uses the regular range interface,
add code that also tests the array and pages interface.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/mm/pageattr-test.c |   28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

--- a/arch/x86/mm/pageattr-test.c
+++ b/arch/x86/mm/pageattr-test.c
@@ -23,7 +23,8 @@
 static __read_mostly int print = 1;
 
 enum {
-	NTEST			= 400,
+	NTEST			= 3 * 100,
+	NPAGES			= 100,
 #ifdef CONFIG_X86_64
 	LPS			= (1 << PMD_SHIFT),
 #elif defined(CONFIG_X86_PAE)
@@ -110,6 +111,9 @@ static int print_split(struct split_stat
 static unsigned long addr[NTEST];
 static unsigned int len[NTEST];
 
+static struct page *pages[NPAGES];
+static unsigned long addrs[NPAGES];
+
 /* Change the global bit on random pages in the direct mapping */
 static int pageattr_test(void)
 {
@@ -137,7 +141,7 @@ static int pageattr_test(void)
 		unsigned long pfn = prandom_u32() % max_pfn_mapped;
 
 		addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT);
-		len[i] = prandom_u32() % 100;
+		len[i] = prandom_u32() % NPAGES;
 		len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1);
 
 		if (len[i] == 0)
@@ -167,14 +171,30 @@ static int pageattr_test(void)
 				break;
 			}
 			__set_bit(pfn + k, bm);
+			addrs[k] = addr[i] + k*PAGE_SIZE;
+			pages[k] = pfn_to_page(pfn + k);
 		}
 		if (!addr[i] || !pte || !k) {
 			addr[i] = 0;
 			continue;
 		}
 
-		test_addr = addr[i];
-		err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0);
+		switch (i % 3) {
+		case 0:
+			test_addr = addr[i];
+			err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0);
+			break;
+
+		case 1:
+			err = change_page_attr_set(addrs, len[1], PAGE_CPA_TEST, 1);
+			break;
+
+		case 2:
+			err = cpa_set_pages_array(pages, len[i], PAGE_CPA_TEST);
+			break;
+		}
+
+
 		if (err < 0) {
 			printk(KERN_ERR "CPA %d failed %d\n", i, err);
 			failed++;