[thirdparty/linux.git] / mm / gup_test.c

#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);
Commit	Line	Data
64c349f4 KS	1	#include <linux/kernel.h>
	2	#include <linux/mm.h>
	3	#include <linux/slab.h>
	4	#include <linux/uaccess.h>
	5	#include <linux/ktime.h>
	6	#include <linux/debugfs.h>
a0ac9b35	7	#include <linux/highmem.h>
b9dcfdff	8	#include "gup_test.h"
64c349f4	9
41c45d37	10	static void put_back_pages(unsigned int cmd, struct page **pages,
f4f9bda4	11	unsigned long nr_pages, unsigned int gup_test_flags)
41c45d37 JH	12	{
	13	unsigned long i;
	14
	15	switch (cmd) {
	16	case GUP_FAST_BENCHMARK:
a9bed1e1	17	case GUP_BASIC_TEST:
41c45d37 JH	18	for (i = 0; i < nr_pages; i++)
	19	put_page(pages[i]);
	20	break;
	21
	22	case PIN_FAST_BENCHMARK:
a9bed1e1	23	case PIN_BASIC_TEST:
657d4f79	24	case PIN_LONGTERM_BENCHMARK:
41c45d37 JH	25	unpin_user_pages(pages, nr_pages);
41c45d37 JH	26	break;
f4f9bda4 JH	27	case DUMP_USER_PAGES_TEST:
	28	if (gup_test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN) {
	29	unpin_user_pages(pages, nr_pages);
	30	} else {
	31	for (i = 0; i < nr_pages; i++)
	32	put_page(pages[i]);
	33
	34	}
	35	break;
41c45d37 JH	36	}
	37	}
	38
	39	static void verify_dma_pinned(unsigned int cmd, struct page **pages,
	40	unsigned long nr_pages)
	41	{
	42	unsigned long i;
c9223a4a	43	struct folio *folio;
41c45d37 JH	44
	45	switch (cmd) {
	46	case PIN_FAST_BENCHMARK:
a9bed1e1	47	case PIN_BASIC_TEST:
657d4f79	48	case PIN_LONGTERM_BENCHMARK:
41c45d37	49	for (i = 0; i < nr_pages; i++) {
c9223a4a VMO	50	folio = page_folio(pages[i]);
	51
	52	if (WARN(!folio_maybe_dma_pinned(folio),
41c45d37 JH	53	"pages[%lu] is NOT dma-pinned\n", i)) {
41c45d37 JH	54
c9223a4a	55	dump_page(&folio->page, "gup_test failure");
41c45d37	56	break;
e44605a8	57	} else if (cmd == PIN_LONGTERM_BENCHMARK &&
c9223a4a	58	WARN(!folio_is_longterm_pinnable(folio),
e44605a8 PT	59	"pages[%lu] is NOT pinnable but pinned\n",
e44605a8 PT	60	i)) {
c9223a4a	61	dump_page(&folio->page, "gup_test failure");
e44605a8	62	break;
41c45d37 JH	63	}
	64	}
	65	break;
	66	}
	67	}
	68
f4f9bda4 JH	69	static void dump_pages_test(struct gup_test gup, struct page *pages,
	70	unsigned long nr_pages)
	71	{
	72	unsigned int index_to_dump;
	73	unsigned int i;
	74
	75	/*
	76	* Zero out any user-supplied page index that is out of range. Remember:
	77	* .which_pages[] contains a 1-based set of page indices.
	78	*/
	79	for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) {
	80	if (gup->which_pages[i] > nr_pages) {
	81	pr_warn("ZEROING due to out of range: .which_pages[%u]: %u\n",
	82	i, gup->which_pages[i]);
	83	gup->which_pages[i] = 0;
	84	}
	85	}
	86
	87	for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) {
	88	index_to_dump = gup->which_pages[i];
	89
	90	if (index_to_dump) {
	91	index_to_dump--; // Decode from 1-based, to 0-based
	92	pr_info("---- page #%u, starting from user virt addr: 0x%llx\n",
	93	index_to_dump, gup->addr);
	94	dump_page(pages[index_to_dump],
	95	"gup_test: dump_pages() test");
	96	}
	97	}
	98	}
	99
9c84f229 JH	100	static int __gup_test_ioctl(unsigned int cmd,
9c84f229 JH	101	struct gup_test *gup)
64c349f4 KS	102	{
64c349f4 KS	103	ktime_t start_time, end_time;
51896864	104	unsigned long i, nr_pages, addr, next;
79dbf135	105	long nr;
64c349f4	106	struct page **pages;
a7c46c0c	107	int ret = 0;
f3964599 JH	108	bool needs_mmap_lock =
f3964599 JH	109	cmd != GUP_FAST_BENCHMARK && cmd != PIN_FAST_BENCHMARK;
64c349f4	110
4b408c74 DC	111	if (gup->size > ULONG_MAX)
	112	return -EINVAL;
	113
64c349f4	114	nr_pages = gup->size / PAGE_SIZE;
778e1cdd	115	pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
64c349f4 KS	116	if (!pages)
	117	return -ENOMEM;
	118
f3964599 JH	119	if (needs_mmap_lock && mmap_read_lock_killable(current->mm)) {
	120	ret = -EINTR;
	121	goto free_pages;
	122	}
	123
64c349f4 KS	124	i = 0;
	125	nr = gup->nr_pages_per_call;
	126	start_time = ktime_get();
	127	for (addr = gup->addr; addr < gup->addr + gup->size; addr = next) {
	128	if (nr != gup->nr_pages_per_call)
	129	break;
	130
	131	next = addr + nr * PAGE_SIZE;
	132	if (next > gup->addr + gup->size) {
	133	next = gup->addr + gup->size;
	134	nr = (next - addr) / PAGE_SIZE;
	135	}
	136
714a3a1e KB	137	switch (cmd) {
714a3a1e KB	138	case GUP_FAST_BENCHMARK:
79dbf135	139	nr = get_user_pages_fast(addr, nr, gup->gup_flags,
714a3a1e KB	140	pages + i);
714a3a1e KB	141	break;
a9bed1e1	142	case GUP_BASIC_TEST:
54d02069	143	nr = get_user_pages(addr, nr, gup->gup_flags, pages + i);
714a3a1e	144	break;
41c45d37	145	case PIN_FAST_BENCHMARK:
79dbf135	146	nr = pin_user_pages_fast(addr, nr, gup->gup_flags,
41c45d37 JH	147	pages + i);
41c45d37 JH	148	break;
a9bed1e1	149	case PIN_BASIC_TEST:
4c630f30	150	nr = pin_user_pages(addr, nr, gup->gup_flags, pages + i);
41c45d37	151	break;
657d4f79 BS	152	case PIN_LONGTERM_BENCHMARK:
657d4f79 BS	153	nr = pin_user_pages(addr, nr,
79dbf135	154	gup->gup_flags \| FOLL_LONGTERM,
4c630f30	155	pages + i);
657d4f79	156	break;
f4f9bda4	157	case DUMP_USER_PAGES_TEST:
79dbf135 PT	158	if (gup->test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN)
79dbf135 PT	159	nr = pin_user_pages(addr, nr, gup->gup_flags,
4c630f30	160	pages + i);
f4f9bda4	161	else
79dbf135	162	nr = get_user_pages(addr, nr, gup->gup_flags,
54d02069	163	pages + i);
f4f9bda4	164	break;
714a3a1e	165	default:
a7c46c0c	166	ret = -EINVAL;
f3964599	167	goto unlock;
714a3a1e KB	168	}
714a3a1e KB	169
09e35a4a MT	170	if (nr <= 0)
09e35a4a MT	171	break;
64c349f4 KS	172	i += nr;
	173	}
	174	end_time = ktime_get();
	175
41c45d37 JH	176	/* Shifting the meaning of nr_pages: now it is actual number pinned: */
	177	nr_pages = i;
	178
26db3d09	179	gup->get_delta_usec = ktime_us_delta(end_time, start_time);
64c349f4 KS	180	gup->size = addr - gup->addr;
64c349f4 KS	181
41c45d37 JH	182	/*
	183	* Take an un-benchmark-timed moment to verify DMA pinned
	184	* state: print a warning if any non-dma-pinned pages are found:
	185	*/
	186	verify_dma_pinned(cmd, pages, nr_pages);
	187
f4f9bda4 JH	188	if (cmd == DUMP_USER_PAGES_TEST)
	189	dump_pages_test(gup, pages, nr_pages);
	190
26db3d09	191	start_time = ktime_get();
41c45d37	192
79dbf135	193	put_back_pages(cmd, pages, nr_pages, gup->test_flags);
41c45d37	194
26db3d09 KB	195	end_time = ktime_get();
26db3d09 KB	196	gup->put_delta_usec = ktime_us_delta(end_time, start_time);
64c349f4	197
f3964599 JH	198	unlock:
	199	if (needs_mmap_lock)
	200	mmap_read_unlock(current->mm);
	201	free_pages:
64c349f4	202	kvfree(pages);
a7c46c0c	203	return ret;
64c349f4 KS	204	}
64c349f4 KS	205
c77369b4 DH	206	static DEFINE_MUTEX(pin_longterm_test_mutex);
	207	static struct page **pin_longterm_test_pages;
	208	static unsigned long pin_longterm_test_nr_pages;
	209
	210	static inline void pin_longterm_test_stop(void)
	211	{
	212	if (pin_longterm_test_pages) {
	213	if (pin_longterm_test_nr_pages)
	214	unpin_user_pages(pin_longterm_test_pages,
	215	pin_longterm_test_nr_pages);
61b963b5	216	kvfree(pin_longterm_test_pages);
c77369b4 DH	217	pin_longterm_test_pages = NULL;
	218	pin_longterm_test_nr_pages = 0;
	219	}
	220	}
	221
	222	static inline int pin_longterm_test_start(unsigned long arg)
	223	{
	224	long nr_pages, cur_pages, addr, remaining_pages;
	225	int gup_flags = FOLL_LONGTERM;
	226	struct pin_longterm_test args;
	227	struct page **pages;
	228	int ret = 0;
	229	bool fast;
	230
	231	if (pin_longterm_test_pages)
	232	return -EINVAL;
	233
	234	if (copy_from_user(&args, (void __user *)arg, sizeof(args)))
	235	return -EFAULT;
	236
	237	if (args.flags &
	238	~(PIN_LONGTERM_TEST_FLAG_USE_WRITE\|PIN_LONGTERM_TEST_FLAG_USE_FAST))
	239	return -EINVAL;
	240	if (!IS_ALIGNED(args.addr \| args.size, PAGE_SIZE))
	241	return -EINVAL;
	242	if (args.size > LONG_MAX)
	243	return -EINVAL;
	244	nr_pages = args.size / PAGE_SIZE;
	245	if (!nr_pages)
	246	return -EINVAL;
	247
	248	pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
	249	if (!pages)
	250	return -ENOMEM;
	251
	252	if (args.flags & PIN_LONGTERM_TEST_FLAG_USE_WRITE)
	253	gup_flags \|= FOLL_WRITE;
	254	fast = !!(args.flags & PIN_LONGTERM_TEST_FLAG_USE_FAST);
	255
	256	if (!fast && mmap_read_lock_killable(current->mm)) {
61b963b5	257	kvfree(pages);
c77369b4 DH	258	return -EINTR;
	259	}
	260
	261	pin_longterm_test_pages = pages;
	262	pin_longterm_test_nr_pages = 0;
	263
	264	while (nr_pages - pin_longterm_test_nr_pages) {
	265	remaining_pages = nr_pages - pin_longterm_test_nr_pages;
	266	addr = args.addr + pin_longterm_test_nr_pages * PAGE_SIZE;
	267
	268	if (fast)
	269	cur_pages = pin_user_pages_fast(addr, remaining_pages,
	270	gup_flags, pages);
	271	else
	272	cur_pages = pin_user_pages(addr, remaining_pages,
4c630f30	273	gup_flags, pages);
c77369b4 DH	274	if (cur_pages < 0) {
	275	pin_longterm_test_stop();
	276	ret = cur_pages;
	277	break;
	278	}
	279	pin_longterm_test_nr_pages += cur_pages;
	280	pages += cur_pages;
	281	}
	282
	283	if (!fast)
	284	mmap_read_unlock(current->mm);
	285	return ret;
	286	}
	287
	288	static inline int pin_longterm_test_read(unsigned long arg)
	289	{
	290	__u64 user_addr;
	291	unsigned long i;
	292
	293	if (!pin_longterm_test_pages)
	294	return -EINVAL;
	295
	296	if (copy_from_user(&user_addr, (void __user *)arg, sizeof(user_addr)))
	297	return -EFAULT;
	298
	299	for (i = 0; i < pin_longterm_test_nr_pages; i++) {
a0ac9b35 DH	300	void *addr = kmap_local_page(pin_longterm_test_pages[i]);
a0ac9b35 DH	301	unsigned long ret;
c77369b4	302
a0ac9b35 DH	303	ret = copy_to_user((void __user *)(unsigned long)user_addr, addr,
	304	PAGE_SIZE);
	305	kunmap_local(addr);
	306	if (ret)
c77369b4 DH	307	return -EFAULT;
	308	user_addr += PAGE_SIZE;
	309	}
	310	return 0;
	311	}
	312
	313	static long pin_longterm_test_ioctl(struct file *filep, unsigned int cmd,
	314	unsigned long arg)
	315	{
	316	int ret = -EINVAL;
	317
	318	if (mutex_lock_killable(&pin_longterm_test_mutex))
	319	return -EINTR;
	320
	321	switch (cmd) {
	322	case PIN_LONGTERM_TEST_START:
	323	ret = pin_longterm_test_start(arg);
	324	break;
	325	case PIN_LONGTERM_TEST_STOP:
	326	pin_longterm_test_stop();
	327	ret = 0;
	328	break;
	329	case PIN_LONGTERM_TEST_READ:
	330	ret = pin_longterm_test_read(arg);
	331	break;
	332	}
	333
	334	mutex_unlock(&pin_longterm_test_mutex);
	335	return ret;
	336	}
	337
9c84f229	338	static long gup_test_ioctl(struct file *filep, unsigned int cmd,
64c349f4 KS	339	unsigned long arg)
64c349f4 KS	340	{
9c84f229	341	struct gup_test gup;
64c349f4 KS	342	int ret;
64c349f4 KS	343
714a3a1e KB	344	switch (cmd) {
714a3a1e KB	345	case GUP_FAST_BENCHMARK:
41c45d37	346	case PIN_FAST_BENCHMARK:
657d4f79	347	case PIN_LONGTERM_BENCHMARK:
a9bed1e1 JH	348	case GUP_BASIC_TEST:
a9bed1e1 JH	349	case PIN_BASIC_TEST:
f4f9bda4	350	case DUMP_USER_PAGES_TEST:
714a3a1e	351	break;
c77369b4 DH	352	case PIN_LONGTERM_TEST_START:
	353	case PIN_LONGTERM_TEST_STOP:
	354	case PIN_LONGTERM_TEST_READ:
	355	return pin_longterm_test_ioctl(filep, cmd, arg);
714a3a1e	356	default:
64c349f4	357	return -EINVAL;
714a3a1e	358	}
64c349f4 KS	359
	360	if (copy_from_user(&gup, (void __user *)arg, sizeof(gup)))
	361	return -EFAULT;
	362
9c84f229	363	ret = __gup_test_ioctl(cmd, &gup);
64c349f4 KS	364	if (ret)
	365	return ret;
	366
	367	if (copy_to_user((void __user *)arg, &gup, sizeof(gup)))
	368	return -EFAULT;
	369
	370	return 0;
	371	}
	372
c77369b4 DH	373	static int gup_test_release(struct inode inode, struct file file)
	374	{
	375	pin_longterm_test_stop();
	376
	377	return 0;
	378	}
	379
9c84f229	380	static const struct file_operations gup_test_fops = {
64c349f4	381	.open = nonseekable_open,
9c84f229	382	.unlocked_ioctl = gup_test_ioctl,
4f572f00	383	.compat_ioctl = compat_ptr_ioctl,
c77369b4	384	.release = gup_test_release,
64c349f4 KS	385	};
64c349f4 KS	386
afaa7888	387	static int __init gup_test_init(void)
64c349f4	388	{
9c84f229 JH	389	debugfs_create_file_unsafe("gup_test", 0600, NULL, NULL,
9c84f229 JH	390	&gup_test_fops);
64c349f4 KS	391
	392	return 0;
	393	}
	394
9c84f229	395	late_initcall(gup_test_init);