396 lines
9.0 KiB
C
396 lines
9.0 KiB
C
#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 <linux/highmem.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 folio *folio;
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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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folio = page_folio(pages[i]);
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if (WARN(!folio_maybe_dma_pinned(folio),
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"pages[%lu] is NOT dma-pinned\n", i)) {
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dump_page(&folio->page, "gup_test failure");
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break;
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} else if (cmd == PIN_LONGTERM_BENCHMARK &&
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WARN(!folio_is_longterm_pinnable(folio),
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"pages[%lu] is NOT pinnable but pinned\n",
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i)) {
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dump_page(&folio->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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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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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);
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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);
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else
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nr = get_user_pages(addr, nr, gup->gup_flags,
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pages + i);
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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 DEFINE_MUTEX(pin_longterm_test_mutex);
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static struct page **pin_longterm_test_pages;
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static unsigned long pin_longterm_test_nr_pages;
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static inline void pin_longterm_test_stop(void)
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{
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if (pin_longterm_test_pages) {
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if (pin_longterm_test_nr_pages)
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unpin_user_pages(pin_longterm_test_pages,
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pin_longterm_test_nr_pages);
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kvfree(pin_longterm_test_pages);
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pin_longterm_test_pages = NULL;
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pin_longterm_test_nr_pages = 0;
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}
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}
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static inline int pin_longterm_test_start(unsigned long arg)
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{
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long nr_pages, cur_pages, addr, remaining_pages;
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int gup_flags = FOLL_LONGTERM;
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struct pin_longterm_test args;
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struct page **pages;
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int ret = 0;
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bool fast;
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if (pin_longterm_test_pages)
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return -EINVAL;
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if (copy_from_user(&args, (void __user *)arg, sizeof(args)))
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return -EFAULT;
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if (args.flags &
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~(PIN_LONGTERM_TEST_FLAG_USE_WRITE|PIN_LONGTERM_TEST_FLAG_USE_FAST))
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return -EINVAL;
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if (!IS_ALIGNED(args.addr | args.size, PAGE_SIZE))
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return -EINVAL;
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if (args.size > LONG_MAX)
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return -EINVAL;
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nr_pages = args.size / PAGE_SIZE;
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if (!nr_pages)
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return -EINVAL;
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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 (args.flags & PIN_LONGTERM_TEST_FLAG_USE_WRITE)
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gup_flags |= FOLL_WRITE;
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fast = !!(args.flags & PIN_LONGTERM_TEST_FLAG_USE_FAST);
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if (!fast && mmap_read_lock_killable(current->mm)) {
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kvfree(pages);
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return -EINTR;
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}
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pin_longterm_test_pages = pages;
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pin_longterm_test_nr_pages = 0;
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while (nr_pages - pin_longterm_test_nr_pages) {
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remaining_pages = nr_pages - pin_longterm_test_nr_pages;
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addr = args.addr + pin_longterm_test_nr_pages * PAGE_SIZE;
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if (fast)
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cur_pages = pin_user_pages_fast(addr, remaining_pages,
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gup_flags, pages);
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else
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cur_pages = pin_user_pages(addr, remaining_pages,
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gup_flags, pages);
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if (cur_pages < 0) {
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pin_longterm_test_stop();
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ret = cur_pages;
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break;
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}
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pin_longterm_test_nr_pages += cur_pages;
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pages += cur_pages;
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}
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if (!fast)
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mmap_read_unlock(current->mm);
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return ret;
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}
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static inline int pin_longterm_test_read(unsigned long arg)
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{
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__u64 user_addr;
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unsigned long i;
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if (!pin_longterm_test_pages)
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return -EINVAL;
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if (copy_from_user(&user_addr, (void __user *)arg, sizeof(user_addr)))
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return -EFAULT;
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for (i = 0; i < pin_longterm_test_nr_pages; i++) {
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void *addr = kmap_local_page(pin_longterm_test_pages[i]);
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unsigned long ret;
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ret = copy_to_user((void __user *)(unsigned long)user_addr, addr,
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PAGE_SIZE);
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kunmap_local(addr);
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if (ret)
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return -EFAULT;
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user_addr += PAGE_SIZE;
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}
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return 0;
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}
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static long pin_longterm_test_ioctl(struct file *filep, unsigned int cmd,
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unsigned long arg)
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{
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int ret = -EINVAL;
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if (mutex_lock_killable(&pin_longterm_test_mutex))
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return -EINTR;
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switch (cmd) {
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case PIN_LONGTERM_TEST_START:
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ret = pin_longterm_test_start(arg);
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break;
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case PIN_LONGTERM_TEST_STOP:
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pin_longterm_test_stop();
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ret = 0;
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break;
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case PIN_LONGTERM_TEST_READ:
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ret = pin_longterm_test_read(arg);
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break;
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}
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mutex_unlock(&pin_longterm_test_mutex);
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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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case PIN_LONGTERM_TEST_START:
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case PIN_LONGTERM_TEST_STOP:
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case PIN_LONGTERM_TEST_READ:
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return pin_longterm_test_ioctl(filep, cmd, arg);
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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 int gup_test_release(struct inode *inode, struct file *file)
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{
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pin_longterm_test_stop();
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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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.compat_ioctl = compat_ptr_ioctl,
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.release = gup_test_release,
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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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