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Diffstat (limited to 'arch/x86/mm/pageattr-test.c')
-rw-r--r--arch/x86/mm/pageattr-test.c113
1 files changed, 61 insertions, 52 deletions
diff --git a/arch/x86/mm/pageattr-test.c b/arch/x86/mm/pageattr-test.c
index 4b22eb47f23a..c58fab061762 100644
--- a/arch/x86/mm/pageattr-test.c
+++ b/arch/x86/mm/pageattr-test.c
@@ -4,36 +4,36 @@
* Clears the global bit on random pages in the direct mapping, then reverts
* and compares page tables forwards and afterwards.
*/
-
-#include <linux/mm.h>
+#include <linux/bootmem.h>
#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/init.h>
-#include <linux/bootmem.h>
+#include <linux/mm.h>
+
#include <asm/cacheflush.h>
#include <asm/pgtable.h>
#include <asm/kdebug.h>
enum {
- NTEST = 400,
+ NTEST = 400,
#ifdef CONFIG_X86_64
- LOWEST_LEVEL = 4,
- LPS = (1 << PMD_SHIFT),
+ LOWEST_LEVEL = 4,
+ LPS = (1 << PMD_SHIFT),
#elif defined(CONFIG_X86_PAE)
- LOWEST_LEVEL = 3,
- LPS = (1 << PMD_SHIFT),
+ LOWEST_LEVEL = 3,
+ LPS = (1 << PMD_SHIFT),
#else
- LOWEST_LEVEL = 3, /* lookup_address lies here */
- LPS = (1 << 22),
+ LOWEST_LEVEL = 3, /* lookup_address lies here */
+ LPS = (1 << 22),
#endif
- GPS = (1<<30)
+ GPS = (1<<30)
};
#ifdef CONFIG_X86_64
-#include <asm/proto.h>
-#define max_mapped end_pfn_map
+# include <asm/proto.h>
+# define max_mapped end_pfn_map
#else
-#define max_mapped max_low_pfn
+# define max_mapped max_low_pfn
#endif
struct split_state {
@@ -43,23 +43,24 @@ struct split_state {
static __init int print_split(struct split_state *s)
{
- int printed = 0;
long i, expected, missed = 0;
+ int printed = 0;
int err = 0;
s->lpg = s->gpg = s->spg = s->exec = 0;
s->min_exec = ~0UL;
s->max_exec = 0;
for (i = 0; i < max_mapped; ) {
+ unsigned long addr = (unsigned long)__va(i << PAGE_SHIFT);
int level;
pte_t *pte;
- unsigned long adr = (unsigned long)__va(i << PAGE_SHIFT);
- pte = lookup_address(adr, &level);
+ pte = lookup_address(addr, &level);
if (!pte) {
if (!printed) {
- dump_pagetable(adr);
- printk("CPA %lx no pte level %d\n", adr, level);
+ dump_pagetable(addr);
+ printk(KERN_INFO "CPA %lx no pte level %d\n",
+ addr, level);
printed = 1;
}
missed++;
@@ -72,8 +73,9 @@ static __init int print_split(struct split_state *s)
i += GPS/PAGE_SIZE;
} else if (level != LOWEST_LEVEL) {
if (!(pte_val(*pte) & _PAGE_PSE)) {
- printk("%lx level %d but not PSE %Lx\n",
- adr, level, (u64)pte_val(*pte));
+ printk(KERN_ERR
+ "%lx level %d but not PSE %Lx\n",
+ addr, level, (u64)pte_val(*pte));
err = 1;
}
s->lpg++;
@@ -84,18 +86,20 @@ static __init int print_split(struct split_state *s)
}
if (!(pte_val(*pte) & _PAGE_NX)) {
s->exec++;
- if (adr < s->min_exec)
- s->min_exec = adr;
- if (adr > s->max_exec)
- s->max_exec = adr;
+ if (addr < s->min_exec)
+ s->min_exec = addr;
+ if (addr > s->max_exec)
+ s->max_exec = addr;
}
}
- printk("CPA mapping 4k %lu large %lu gb %lu x %lu[%lx-%lx] miss %lu\n",
+ 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);
+
expected = (s->gpg*GPS + s->lpg*LPS)/PAGE_SIZE + s->spg + missed;
if (expected != i) {
- printk("CPA max_mapped %lu but expected %lu\n",
+ printk(KERN_ERR "CPA max_mapped %lu but expected %lu\n",
max_mapped, expected);
return 1;
}
@@ -105,56 +109,62 @@ static __init int print_split(struct split_state *s)
static __init int state_same(struct split_state *a, struct split_state *b)
{
return a->lpg == b->lpg && a->gpg == b->gpg && a->spg == b->spg &&
- a->exec == b->exec;
+ a->exec == b->exec;
}
-static unsigned long addr[NTEST] __initdata;
-static unsigned len[NTEST] __initdata;
+static unsigned long __initdata addr[NTEST];
+static unsigned int __initdata len[NTEST];
/* Change the global bit on random pages in the direct mapping */
static __init int exercise_pageattr(void)
{
- int i, k;
+ struct split_state sa, sb, sc;
+ unsigned long *bm;
pte_t *pte, pte0;
+ int failed = 0;
int level;
+ int i, k;
int err;
- struct split_state sa, sb, sc;
- int failed = 0;
- unsigned long *bm;
- printk("CPA exercising pageattr\n");
+ printk(KERN_INFO "CPA exercising pageattr\n");
bm = vmalloc((max_mapped + 7) / 8);
if (!bm) {
- printk("CPA Cannot vmalloc bitmap\n");
+ printk(KERN_ERR "CPA Cannot vmalloc bitmap\n");
return -ENOMEM;
}
memset(bm, 0, (max_mapped + 7) / 8);
failed += print_split(&sa);
srandom32(100);
+
for (i = 0; i < NTEST; i++) {
unsigned long pfn = random32() % max_mapped;
+
addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT);
len[i] = random32() % 100;
len[i] = min_t(unsigned long, len[i], max_mapped - pfn - 1);
+
if (len[i] == 0)
len[i] = 1;
pte = NULL;
pte0 = pfn_pte(0, __pgprot(0)); /* shut gcc up */
+
for (k = 0; k < len[i]; k++) {
pte = lookup_address(addr[i] + k*PAGE_SIZE, &level);
if (!pte || pgprot_val(pte_pgprot(*pte)) == 0) {
addr[i] = 0;
break;
}
- if (k == 0)
+ if (k == 0) {
pte0 = *pte;
- else if (pgprot_val(pte_pgprot(*pte)) !=
+ } else {
+ if (pgprot_val(pte_pgprot(*pte)) !=
pgprot_val(pte_pgprot(pte0))) {
- len[i] = k;
- break;
+ len[i] = k;
+ break;
+ }
}
if (test_bit(pfn + k, bm)) {
len[i] = k;
@@ -170,19 +180,19 @@ static __init int exercise_pageattr(void)
err = change_page_attr(virt_to_page(addr[i]), len[i],
pte_pgprot(pte_clrhuge(pte_clrglobal(pte0))));
if (err < 0) {
- printk("CPA %d failed %d\n", i, err);
+ 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)) {
- printk("CPA %lx: bad pte %Lx\n", addr[i],
+ printk(KERN_ERR "CPA %lx: bad pte %Lx\n", addr[i],
pte ? (u64)pte_val(*pte) : 0ULL);
failed++;
}
if (level != LOWEST_LEVEL) {
- printk("CPA %lx: unexpected level %d\n", addr[i],
- level);
+ printk(KERN_ERR "CPA %lx: unexpected level %d\n",
+ addr[i], level);
failed++;
}
@@ -192,26 +202,26 @@ static __init int exercise_pageattr(void)
failed += print_split(&sb);
- printk("CPA reverting everything\n");
+ printk(KERN_INFO "CPA reverting everything\n");
for (i = 0; i < NTEST; i++) {
if (!addr[i])
continue;
pte = lookup_address(addr[i], &level);
if (!pte) {
- printk("CPA lookup of %lx failed\n", addr[i]);
+ printk(KERN_ERR "CPA lookup of %lx failed\n", addr[i]);
failed++;
continue;
}
err = change_page_attr(virt_to_page(addr[i]), len[i],
pte_pgprot(pte_mkglobal(*pte)));
if (err < 0) {
- printk("CPA reverting failed: %d\n", err);
+ printk(KERN_ERR "CPA reverting failed: %d\n", err);
failed++;
}
pte = lookup_address(addr[i], &level);
if (!pte || !pte_global(*pte)) {
- printk("CPA %lx: bad pte after revert %Lx\n", addr[i],
- pte ? (u64)pte_val(*pte) : 0ULL);
+ printk(KERN_ERR "CPA %lx: bad pte after revert %Lx\n",
+ addr[i], pte ? (u64)pte_val(*pte) : 0ULL);
failed++;
}
@@ -223,11 +233,10 @@ static __init int exercise_pageattr(void)
failed++;
if (failed)
- printk("CPA selftests NOT PASSED. Please report.\n");
+ printk(KERN_ERR "CPA selftests NOT PASSED. Please report.\n");
else
- printk("CPA selftests PASSED\n");
+ printk(KERN_INFO "CPA selftests PASSED\n");
return 0;
}
-
module_init(exercise_pageattr);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-16 22:10:26 +0300