x86: c_p_a(), add simple self test at boot

Since change_page_attr() is tricky code it is good to have some regression
test code. This patch maps and unmaps some random pages in the direct mapping
at boot and then dumps the state and does some simple sanity checks.

Add it with a CONFIG option.

Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andi Kleen 2008-01-30 13:33:43 +01:00 committed by Ingo Molnar
parent f0646e43ac
commit fa2d8369a1
3 changed files with 235 additions and 0 deletions

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@ -4,6 +4,7 @@
obj-y := init_32.o pgtable_32.o fault_32.o ioremap_32.o extable.o pageattr_32.o mmap.o
obj-$(CONFIG_CPA_DEBUG) += pageattr-test.o
obj-$(CONFIG_NUMA) += discontig_32.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_HIGHMEM) += highmem_32.o

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@ -7,3 +7,4 @@ obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_NUMA) += numa_64.o
obj-$(CONFIG_K8_NUMA) += k8topology_64.o
obj-$(CONFIG_ACPI_NUMA) += srat_64.o
obj-$(CONFIG_CPA_DEBUG) += pageattr-test.o

233
arch/x86/mm/pageattr-test.c Normal file
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@ -0,0 +1,233 @@
/*
* 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.
*/
#include <linux/mm.h>
#include <linux/random.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <asm/cacheflush.h>
#include <asm/pgtable.h>
#include <asm/kdebug.h>
enum {
NTEST = 400,
#ifdef CONFIG_X86_64
LOWEST_LEVEL = 4,
LPS = (1 << PMD_SHIFT),
#elif defined(CONFIG_X86_PAE)
LOWEST_LEVEL = 3,
LPS = (1 << PMD_SHIFT),
#else
LOWEST_LEVEL = 3, /* lookup_address lies here */
LPS = (1 << 22),
#endif
GPS = (1<<30)
};
#ifdef CONFIG_X86_64
#include <asm/proto.h>
#define max_mapped end_pfn_map
#else
#define max_mapped max_low_pfn
#endif
struct split_state {
long lpg, gpg, spg, exec;
long min_exec, max_exec;
};
static __init int print_split(struct split_state *s)
{
int printed = 0;
long i, expected, missed = 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; ) {
int level;
pte_t *pte;
unsigned long adr = (unsigned long)__va(i << PAGE_SHIFT);
pte = lookup_address(adr, &level);
if (!pte) {
if (!printed) {
dump_pagetable(adr);
printk("CPA %lx no pte level %d\n", adr, level);
printed = 1;
}
missed++;
i++;
continue;
}
if (level == 2 && sizeof(long) == 8) {
s->gpg++;
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));
err = 1;
}
s->lpg++;
i += LPS/PAGE_SIZE;
} else {
s->spg++;
i++;
}
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;
}
}
printk("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",
max_mapped, expected);
return 1;
}
return err;
}
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;
}
static unsigned long addr[NTEST] __initdata;
static unsigned len[NTEST] __initdata;
/* Change the global bit on random pages in the direct mapping */
static __init int exercise_pageattr(void)
{
int i, k;
pte_t *pte, pte0;
int level;
int err;
struct split_state sa, sb, sc;
int failed = 0;
unsigned long *bm;
printk("CPA exercising pageattr\n");
bm = vmalloc((max_mapped + 7) / 8);
if (!bm) {
printk("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)
pte0 = *pte;
else if (pgprot_val(pte_pgprot(*pte)) !=
pgprot_val(pte_pgprot(pte0))) {
len[i] = k;
break;
}
if (test_bit(pfn + k, bm)) {
len[i] = k;
break;
}
__set_bit(pfn + k, bm);
}
if (!addr[i] || !pte || !k) {
addr[i] = 0;
continue;
}
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);
failed++;
}
pte = lookup_address(addr[i], &level);
if (!pte || pte_global(*pte) || pte_huge(*pte)) {
printk("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);
failed++;
}
}
vfree(bm);
global_flush_tlb();
failed += print_split(&sb);
printk("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]);
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);
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);
failed++;
}
}
global_flush_tlb();
failed += print_split(&sc);
if (!state_same(&sa, &sc))
failed++;
if (failed)
printk("CPA selftests NOT PASSED. Please report.\n");
else
printk("CPA selftests PASSED\n");
return 0;
}
module_init(exercise_pageattr);