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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /mm/gup_test.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'mm/gup_test.c')
-rw-r--r--mm/gup_test.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/mm/gup_test.c b/mm/gup_test.c
new file mode 100644
index 0000000000..eeb3f4d87c
--- /dev/null
+++ b/mm/gup_test.c
@@ -0,0 +1,395 @@
+#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 <linux/highmem.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 folio *folio;
+
+ switch (cmd) {
+ case PIN_FAST_BENCHMARK:
+ case PIN_BASIC_TEST:
+ case PIN_LONGTERM_BENCHMARK:
+ for (i = 0; i < nr_pages; i++) {
+ folio = page_folio(pages[i]);
+
+ if (WARN(!folio_maybe_dma_pinned(folio),
+ "pages[%lu] is NOT dma-pinned\n", i)) {
+
+ dump_page(&folio->page, "gup_test failure");
+ break;
+ } else if (cmd == PIN_LONGTERM_BENCHMARK &&
+ WARN(!folio_is_longterm_pinnable(folio),
+ "pages[%lu] is NOT pinnable but pinned\n",
+ i)) {
+ dump_page(&folio->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);
+ 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);
+ break;
+ case PIN_LONGTERM_BENCHMARK:
+ nr = pin_user_pages(addr, nr,
+ gup->gup_flags | FOLL_LONGTERM,
+ pages + i);
+ 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);
+ else
+ nr = get_user_pages(addr, nr, gup->gup_flags,
+ pages + i);
+ 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 DEFINE_MUTEX(pin_longterm_test_mutex);
+static struct page **pin_longterm_test_pages;
+static unsigned long pin_longterm_test_nr_pages;
+
+static inline void pin_longterm_test_stop(void)
+{
+ if (pin_longterm_test_pages) {
+ if (pin_longterm_test_nr_pages)
+ unpin_user_pages(pin_longterm_test_pages,
+ pin_longterm_test_nr_pages);
+ kvfree(pin_longterm_test_pages);
+ pin_longterm_test_pages = NULL;
+ pin_longterm_test_nr_pages = 0;
+ }
+}
+
+static inline int pin_longterm_test_start(unsigned long arg)
+{
+ long nr_pages, cur_pages, addr, remaining_pages;
+ int gup_flags = FOLL_LONGTERM;
+ struct pin_longterm_test args;
+ struct page **pages;
+ int ret = 0;
+ bool fast;
+
+ if (pin_longterm_test_pages)
+ return -EINVAL;
+
+ if (copy_from_user(&args, (void __user *)arg, sizeof(args)))
+ return -EFAULT;
+
+ if (args.flags &
+ ~(PIN_LONGTERM_TEST_FLAG_USE_WRITE|PIN_LONGTERM_TEST_FLAG_USE_FAST))
+ return -EINVAL;
+ if (!IS_ALIGNED(args.addr | args.size, PAGE_SIZE))
+ return -EINVAL;
+ if (args.size > LONG_MAX)
+ return -EINVAL;
+ nr_pages = args.size / PAGE_SIZE;
+ if (!nr_pages)
+ return -EINVAL;
+
+ pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
+ if (!pages)
+ return -ENOMEM;
+
+ if (args.flags & PIN_LONGTERM_TEST_FLAG_USE_WRITE)
+ gup_flags |= FOLL_WRITE;
+ fast = !!(args.flags & PIN_LONGTERM_TEST_FLAG_USE_FAST);
+
+ if (!fast && mmap_read_lock_killable(current->mm)) {
+ kvfree(pages);
+ return -EINTR;
+ }
+
+ pin_longterm_test_pages = pages;
+ pin_longterm_test_nr_pages = 0;
+
+ while (nr_pages - pin_longterm_test_nr_pages) {
+ remaining_pages = nr_pages - pin_longterm_test_nr_pages;
+ addr = args.addr + pin_longterm_test_nr_pages * PAGE_SIZE;
+
+ if (fast)
+ cur_pages = pin_user_pages_fast(addr, remaining_pages,
+ gup_flags, pages);
+ else
+ cur_pages = pin_user_pages(addr, remaining_pages,
+ gup_flags, pages);
+ if (cur_pages < 0) {
+ pin_longterm_test_stop();
+ ret = cur_pages;
+ break;
+ }
+ pin_longterm_test_nr_pages += cur_pages;
+ pages += cur_pages;
+ }
+
+ if (!fast)
+ mmap_read_unlock(current->mm);
+ return ret;
+}
+
+static inline int pin_longterm_test_read(unsigned long arg)
+{
+ __u64 user_addr;
+ unsigned long i;
+
+ if (!pin_longterm_test_pages)
+ return -EINVAL;
+
+ if (copy_from_user(&user_addr, (void __user *)arg, sizeof(user_addr)))
+ return -EFAULT;
+
+ for (i = 0; i < pin_longterm_test_nr_pages; i++) {
+ void *addr = kmap_local_page(pin_longterm_test_pages[i]);
+ unsigned long ret;
+
+ ret = copy_to_user((void __user *)(unsigned long)user_addr, addr,
+ PAGE_SIZE);
+ kunmap_local(addr);
+ if (ret)
+ return -EFAULT;
+ user_addr += PAGE_SIZE;
+ }
+ return 0;
+}
+
+static long pin_longterm_test_ioctl(struct file *filep, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret = -EINVAL;
+
+ if (mutex_lock_killable(&pin_longterm_test_mutex))
+ return -EINTR;
+
+ switch (cmd) {
+ case PIN_LONGTERM_TEST_START:
+ ret = pin_longterm_test_start(arg);
+ break;
+ case PIN_LONGTERM_TEST_STOP:
+ pin_longterm_test_stop();
+ ret = 0;
+ break;
+ case PIN_LONGTERM_TEST_READ:
+ ret = pin_longterm_test_read(arg);
+ break;
+ }
+
+ mutex_unlock(&pin_longterm_test_mutex);
+ 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;
+ case PIN_LONGTERM_TEST_START:
+ case PIN_LONGTERM_TEST_STOP:
+ case PIN_LONGTERM_TEST_READ:
+ return pin_longterm_test_ioctl(filep, cmd, arg);
+ 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 int gup_test_release(struct inode *inode, struct file *file)
+{
+ pin_longterm_test_stop();
+
+ return 0;
+}
+
+static const struct file_operations gup_test_fops = {
+ .open = nonseekable_open,
+ .unlocked_ioctl = gup_test_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
+ .release = gup_test_release,
+};
+
+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);