selftests/mm: check that PAGEMAP_SCAN returns correct categories
Right now, tests read page flags from /proc/pid/pagemap files. With this change, tests will check that PAGEMAP_SCAN return correct information too. [colin.i.king@gmail.com: fix spelling mistake "succedded" -> "succeeded"] Link: https://lkml.kernel.org/r/20231121093104.1728332-1-colin.i.king@gmail.com Link: https://lkml.kernel.org/r/20231106220959.296568-2-avagin@google.com Signed-off-by: Andrei Vagin <avagin@google.com> Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com> Tested-by: Muhammad Usama Anjum <usama.anjum@collabora.com> Cc: Michał Mirosław <mirq-linux@rere.qmqm.pl> [avagin@google.com: allow running tests on old kernels] Link: https://lkml.kernel.org/r/20231117181127.2574897-1-avagin@google.com Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -4,6 +4,7 @@
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#include <dirent.h>
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#include <dirent.h>
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#include <sys/ioctl.h>
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#include <sys/ioctl.h>
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#include <linux/userfaultfd.h>
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#include <linux/userfaultfd.h>
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#include <linux/fs.h>
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#include <sys/syscall.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include <unistd.h>
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#include "../kselftest.h"
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#include "../kselftest.h"
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@ -28,19 +29,92 @@ uint64_t pagemap_get_entry(int fd, char *start)
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return entry;
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return entry;
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}
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}
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static uint64_t __pagemap_scan_get_categories(int fd, char *start, struct page_region *r)
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{
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struct pm_scan_arg arg;
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arg.start = (uintptr_t)start;
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arg.end = (uintptr_t)(start + psize());
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arg.vec = (uintptr_t)r;
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arg.vec_len = 1;
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arg.flags = 0;
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arg.size = sizeof(struct pm_scan_arg);
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arg.max_pages = 0;
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arg.category_inverted = 0;
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arg.category_mask = 0;
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arg.category_anyof_mask = PAGE_IS_WPALLOWED | PAGE_IS_WRITTEN | PAGE_IS_FILE |
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PAGE_IS_PRESENT | PAGE_IS_SWAPPED | PAGE_IS_PFNZERO |
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PAGE_IS_HUGE | PAGE_IS_SOFT_DIRTY;
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arg.return_mask = arg.category_anyof_mask;
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return ioctl(fd, PAGEMAP_SCAN, &arg);
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}
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static uint64_t pagemap_scan_get_categories(int fd, char *start)
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{
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struct page_region r;
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long ret;
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ret = __pagemap_scan_get_categories(fd, start, &r);
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if (ret < 0)
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ksft_exit_fail_msg("PAGEMAP_SCAN failed: %s\n", strerror(errno));
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if (ret == 0)
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return 0;
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return r.categories;
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}
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/* `start` is any valid address. */
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static bool pagemap_scan_supported(int fd, char *start)
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{
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static int supported = -1;
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int ret;
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if (supported != -1)
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return supported;
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/* Provide an invalid address in order to trigger EFAULT. */
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ret = __pagemap_scan_get_categories(fd, start, (struct page_region *) ~0UL);
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if (ret == 0)
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ksft_exit_fail_msg("PAGEMAP_SCAN succeeded unexpectedly\n");
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supported = errno == EFAULT;
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return supported;
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}
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static bool page_entry_is(int fd, char *start, char *desc,
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uint64_t pagemap_flags, uint64_t pagescan_flags)
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{
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bool m = pagemap_get_entry(fd, start) & pagemap_flags;
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if (pagemap_scan_supported(fd, start)) {
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bool s = pagemap_scan_get_categories(fd, start) & pagescan_flags;
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if (m == s)
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return m;
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ksft_exit_fail_msg(
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"read and ioctl return unmatched results for %s: %d %d", desc, m, s);
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}
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return m;
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}
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bool pagemap_is_softdirty(int fd, char *start)
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bool pagemap_is_softdirty(int fd, char *start)
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{
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{
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return pagemap_get_entry(fd, start) & PM_SOFT_DIRTY;
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return page_entry_is(fd, start, "soft-dirty",
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PM_SOFT_DIRTY, PAGE_IS_SOFT_DIRTY);
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}
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}
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bool pagemap_is_swapped(int fd, char *start)
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bool pagemap_is_swapped(int fd, char *start)
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{
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{
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return pagemap_get_entry(fd, start) & PM_SWAP;
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return page_entry_is(fd, start, "swap", PM_SWAP, PAGE_IS_SWAPPED);
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}
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}
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bool pagemap_is_populated(int fd, char *start)
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bool pagemap_is_populated(int fd, char *start)
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{
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{
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return pagemap_get_entry(fd, start) & (PM_PRESENT | PM_SWAP);
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return page_entry_is(fd, start, "populated",
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PM_PRESENT | PM_SWAP,
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PAGE_IS_PRESENT | PAGE_IS_SWAPPED);
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}
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}
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unsigned long pagemap_get_pfn(int fd, char *start)
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unsigned long pagemap_get_pfn(int fd, char *start)
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