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