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- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/uaccess.h>
- #include <linux/ktime.h>
- #include <linux/debugfs.h>
- #include "gup_test.h"
- static void put_back_pages(unsigned int cmd, struct page **pages,
- unsigned long nr_pages, unsigned int gup_test_flags)
- {
- unsigned long i;
- switch (cmd) {
- case GUP_FAST_BENCHMARK:
- case GUP_BASIC_TEST:
- for (i = 0; i < nr_pages; i++)
- put_page(pages[i]);
- break;
- case PIN_FAST_BENCHMARK:
- case PIN_BASIC_TEST:
- case PIN_LONGTERM_BENCHMARK:
- unpin_user_pages(pages, nr_pages);
- break;
- case DUMP_USER_PAGES_TEST:
- if (gup_test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN) {
- unpin_user_pages(pages, nr_pages);
- } else {
- for (i = 0; i < nr_pages; i++)
- put_page(pages[i]);
- }
- break;
- }
- }
- static void verify_dma_pinned(unsigned int cmd, struct page **pages,
- unsigned long nr_pages)
- {
- unsigned long i;
- struct page *page;
- switch (cmd) {
- case PIN_FAST_BENCHMARK:
- case PIN_BASIC_TEST:
- case PIN_LONGTERM_BENCHMARK:
- for (i = 0; i < nr_pages; i++) {
- page = pages[i];
- if (WARN(!page_maybe_dma_pinned(page),
- "pages[%lu] is NOT dma-pinned\n", i)) {
- dump_page(page, "gup_test failure");
- break;
- } else if (cmd == PIN_LONGTERM_BENCHMARK &&
- WARN(!is_longterm_pinnable_page(page),
- "pages[%lu] is NOT pinnable but pinned\n",
- i)) {
- dump_page(page, "gup_test failure");
- break;
- }
- }
- break;
- }
- }
- static void dump_pages_test(struct gup_test *gup, struct page **pages,
- unsigned long nr_pages)
- {
- unsigned int index_to_dump;
- unsigned int i;
- /*
- * Zero out any user-supplied page index that is out of range. Remember:
- * .which_pages[] contains a 1-based set of page indices.
- */
- for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) {
- if (gup->which_pages[i] > nr_pages) {
- pr_warn("ZEROING due to out of range: .which_pages[%u]: %u\n",
- i, gup->which_pages[i]);
- gup->which_pages[i] = 0;
- }
- }
- for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) {
- index_to_dump = gup->which_pages[i];
- if (index_to_dump) {
- index_to_dump--; // Decode from 1-based, to 0-based
- pr_info("---- page #%u, starting from user virt addr: 0x%llx\n",
- index_to_dump, gup->addr);
- dump_page(pages[index_to_dump],
- "gup_test: dump_pages() test");
- }
- }
- }
- static int __gup_test_ioctl(unsigned int cmd,
- struct gup_test *gup)
- {
- ktime_t start_time, end_time;
- unsigned long i, nr_pages, addr, next;
- long nr;
- struct page **pages;
- int ret = 0;
- bool needs_mmap_lock =
- cmd != GUP_FAST_BENCHMARK && cmd != PIN_FAST_BENCHMARK;
- if (gup->size > ULONG_MAX)
- return -EINVAL;
- nr_pages = gup->size / PAGE_SIZE;
- pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
- if (!pages)
- return -ENOMEM;
- if (needs_mmap_lock && mmap_read_lock_killable(current->mm)) {
- ret = -EINTR;
- goto free_pages;
- }
- i = 0;
- nr = gup->nr_pages_per_call;
- start_time = ktime_get();
- for (addr = gup->addr; addr < gup->addr + gup->size; addr = next) {
- if (nr != gup->nr_pages_per_call)
- break;
- next = addr + nr * PAGE_SIZE;
- if (next > gup->addr + gup->size) {
- next = gup->addr + gup->size;
- nr = (next - addr) / PAGE_SIZE;
- }
- switch (cmd) {
- case GUP_FAST_BENCHMARK:
- nr = get_user_pages_fast(addr, nr, gup->gup_flags,
- pages + i);
- break;
- case GUP_BASIC_TEST:
- nr = get_user_pages(addr, nr, gup->gup_flags, pages + i,
- NULL);
- break;
- case PIN_FAST_BENCHMARK:
- nr = pin_user_pages_fast(addr, nr, gup->gup_flags,
- pages + i);
- break;
- case PIN_BASIC_TEST:
- nr = pin_user_pages(addr, nr, gup->gup_flags, pages + i,
- NULL);
- break;
- case PIN_LONGTERM_BENCHMARK:
- nr = pin_user_pages(addr, nr,
- gup->gup_flags | FOLL_LONGTERM,
- pages + i, NULL);
- break;
- case DUMP_USER_PAGES_TEST:
- if (gup->test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN)
- nr = pin_user_pages(addr, nr, gup->gup_flags,
- pages + i, NULL);
- else
- nr = get_user_pages(addr, nr, gup->gup_flags,
- pages + i, NULL);
- break;
- default:
- ret = -EINVAL;
- goto unlock;
- }
- if (nr <= 0)
- break;
- i += nr;
- }
- end_time = ktime_get();
- /* Shifting the meaning of nr_pages: now it is actual number pinned: */
- nr_pages = i;
- gup->get_delta_usec = ktime_us_delta(end_time, start_time);
- gup->size = addr - gup->addr;
- /*
- * Take an un-benchmark-timed moment to verify DMA pinned
- * state: print a warning if any non-dma-pinned pages are found:
- */
- verify_dma_pinned(cmd, pages, nr_pages);
- if (cmd == DUMP_USER_PAGES_TEST)
- dump_pages_test(gup, pages, nr_pages);
- start_time = ktime_get();
- put_back_pages(cmd, pages, nr_pages, gup->test_flags);
- end_time = ktime_get();
- gup->put_delta_usec = ktime_us_delta(end_time, start_time);
- unlock:
- if (needs_mmap_lock)
- mmap_read_unlock(current->mm);
- free_pages:
- kvfree(pages);
- return ret;
- }
- static long gup_test_ioctl(struct file *filep, unsigned int cmd,
- unsigned long arg)
- {
- struct gup_test gup;
- int ret;
- switch (cmd) {
- case GUP_FAST_BENCHMARK:
- case PIN_FAST_BENCHMARK:
- case PIN_LONGTERM_BENCHMARK:
- case GUP_BASIC_TEST:
- case PIN_BASIC_TEST:
- case DUMP_USER_PAGES_TEST:
- break;
- default:
- return -EINVAL;
- }
- if (copy_from_user(&gup, (void __user *)arg, sizeof(gup)))
- return -EFAULT;
- ret = __gup_test_ioctl(cmd, &gup);
- if (ret)
- return ret;
- if (copy_to_user((void __user *)arg, &gup, sizeof(gup)))
- return -EFAULT;
- return 0;
- }
- static const struct file_operations gup_test_fops = {
- .open = nonseekable_open,
- .unlocked_ioctl = gup_test_ioctl,
- };
- static int __init gup_test_init(void)
- {
- debugfs_create_file_unsafe("gup_test", 0600, NULL, NULL,
- &gup_test_fops);
- return 0;
- }
- late_initcall(gup_test_init);
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