/*
* self test for change_page_attr.
*
- * Clears the global bit on random pages in the direct mapping, then reverts
- * and compares page tables forwards and afterwards.
+ * Clears the a test pte bit on random pages in the direct mapping,
+ * then reverts and compares page tables forwards and afterwards.
*/
#include <linux/bootmem.h>
+#include <linux/kthread.h>
#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/pgtable.h>
#include <asm/kdebug.h>
+/*
+ * Only print the results of the first pass:
+ */
+static __read_mostly int print = 1;
+
enum {
NTEST = 400,
- LOWEST_LEVEL = PG_LEVEL_4K,
#ifdef CONFIG_X86_64
LPS = (1 << PMD_SHIFT),
#elif defined(CONFIG_X86_PAE)
GPS = (1<<30)
};
+#define PAGE_CPA_TEST __pgprot(_PAGE_CPA_TEST)
+
+static int pte_testbit(pte_t pte)
+{
+ return pte_flags(pte) & _PAGE_UNUSED1;
+}
+
struct split_state {
long lpg, gpg, spg, exec;
long min_exec, max_exec;
};
-static __init int print_split(struct split_state *s)
+static int print_split(struct split_state *s)
{
long i, expected, missed = 0;
- int printed = 0;
int err = 0;
s->lpg = s->gpg = s->spg = s->exec = 0;
s->max_exec = 0;
for (i = 0; i < max_pfn_mapped; ) {
unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT);
- int level;
+ unsigned int level;
pte_t *pte;
pte = lookup_address(addr, &level);
if (!pte) {
- if (!printed) {
- dump_pagetable(addr);
- printk(KERN_INFO "CPA %lx no pte level %d\n",
- addr, level);
- printed = 1;
- }
missed++;
i++;
continue;
}
- if (level == 2 && sizeof(long) == 8) {
+ if (level == PG_LEVEL_1G && sizeof(long) == 8) {
s->gpg++;
i += GPS/PAGE_SIZE;
- } else if (level != LOWEST_LEVEL) {
+ } else if (level == PG_LEVEL_2M) {
if (!(pte_val(*pte) & _PAGE_PSE)) {
printk(KERN_ERR
"%lx level %d but not PSE %Lx\n",
s->max_exec = addr;
}
}
- printk(KERN_INFO
- "CPA mapping 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n",
- s->spg, s->lpg, s->gpg, s->exec,
- s->min_exec != ~0UL ? s->min_exec : 0, s->max_exec, missed);
+ if (print) {
+ printk(KERN_INFO
+ " 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n",
+ s->spg, s->lpg, s->gpg, s->exec,
+ s->min_exec != ~0UL ? s->min_exec : 0,
+ s->max_exec, missed);
+ }
expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed;
if (expected != i) {
return err;
}
-static unsigned long __initdata addr[NTEST];
-static unsigned int __initdata len[NTEST];
+static unsigned long addr[NTEST];
+static unsigned int len[NTEST];
/* Change the global bit on random pages in the direct mapping */
-static __init int exercise_pageattr(void)
+static int pageattr_test(void)
{
struct split_state sa, sb, sc;
unsigned long *bm;
pte_t *pte, pte0;
int failed = 0;
- int level;
+ unsigned int level;
int i, k;
int err;
+ unsigned long test_addr;
- printk(KERN_INFO "CPA exercising pageattr\n");
+ if (print)
+ printk(KERN_INFO "CPA self-test:\n");
bm = vmalloc((max_pfn_mapped + 7) / 8);
if (!bm) {
for (k = 0; k < len[i]; k++) {
pte = lookup_address(addr[i] + k*PAGE_SIZE, &level);
- if (!pte || pgprot_val(pte_pgprot(*pte)) == 0) {
+ if (!pte || pgprot_val(pte_pgprot(*pte)) == 0 ||
+ !(pte_val(*pte) & _PAGE_PRESENT)) {
addr[i] = 0;
break;
}
continue;
}
- err = change_page_attr_clear(addr[i], len[i],
- __pgprot(_PAGE_GLOBAL));
+ test_addr = addr[i];
+ err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0);
if (err < 0) {
printk(KERN_ERR "CPA %d failed %d\n", i, err);
failed++;
}
pte = lookup_address(addr[i], &level);
- if (!pte || pte_global(*pte) || pte_huge(*pte)) {
+ if (!pte || !pte_testbit(*pte) || pte_huge(*pte)) {
printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i],
pte ? (u64)pte_val(*pte) : 0ULL);
failed++;
}
- if (level != LOWEST_LEVEL) {
+ if (level != PG_LEVEL_4K) {
printk(KERN_ERR "CPA %lx: unexpected level %d\n",
addr[i], level);
failed++;
}
vfree(bm);
- global_flush_tlb();
failed += print_split(&sb);
- printk(KERN_INFO "CPA reverting everything\n");
for (i = 0; i < NTEST; i++) {
if (!addr[i])
continue;
failed++;
continue;
}
- err = change_page_attr_set(addr[i], len[i],
- __pgprot(_PAGE_GLOBAL));
+ test_addr = addr[i];
+ err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0);
if (err < 0) {
printk(KERN_ERR "CPA reverting failed: %d\n", err);
failed++;
}
pte = lookup_address(addr[i], &level);
- if (!pte || !pte_global(*pte)) {
+ if (!pte || pte_testbit(*pte)) {
printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n",
addr[i], pte ? (u64)pte_val(*pte) : 0ULL);
failed++;
}
}
- global_flush_tlb();
failed += print_split(&sc);
if (failed) {
- printk(KERN_ERR "CPA selftests NOT PASSED. Please report.\n");
- WARN_ON(1);
+ WARN(1, KERN_ERR "NOT PASSED. Please report.\n");
+ return -EINVAL;
} else {
- printk(KERN_INFO "CPA selftests PASSED\n");
+ if (print)
+ printk(KERN_INFO "ok.\n");
}
return 0;
}
-module_init(exercise_pageattr);
+
+static int do_pageattr_test(void *__unused)
+{
+ while (!kthread_should_stop()) {
+ schedule_timeout_interruptible(HZ*30);
+ if (pageattr_test() < 0)
+ break;
+ if (print)
+ print--;
+ }
+ return 0;
+}
+
+static int start_pageattr_test(void)
+{
+ struct task_struct *p;
+
+ p = kthread_create(do_pageattr_test, NULL, "pageattr-test");
+ if (!IS_ERR(p))
+ wake_up_process(p);
+ else
+ WARN_ON(1);
+
+ return 0;
+}
+
+module_init(start_pageattr_test);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff