[linux-block.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 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 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, NULL);
		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,
	.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;
	43	struct page *page;
	44
	45	switch (cmd) {
	46	case PIN_FAST_BENCHMARK:
a9bed1e1	47	case PIN_BASIC_TEST:
657d4f79	48	case PIN_LONGTERM_BENCHMARK:
41c45d37 JH	49	for (i = 0; i < nr_pages; i++) {
	50	page = pages[i];
	51	if (WARN(!page_maybe_dma_pinned(page),
	52	"pages[%lu] is NOT dma-pinned\n", i)) {
	53
9c84f229	54	dump_page(page, "gup_test failure");
41c45d37	55	break;
e44605a8	56	} else if (cmd == PIN_LONGTERM_BENCHMARK &&
6077c943	57	WARN(!is_longterm_pinnable_page(page),
e44605a8 PT	58	"pages[%lu] is NOT pinnable but pinned\n",
	59	i)) {
	60	dump_page(page, "gup_test failure");
	61	break;
41c45d37 JH	62	}
	63	}
	64	break;
	65	}
	66	}
	67
f4f9bda4 JH	68	static void dump_pages_test(struct gup_test gup, struct page *pages,
	69	unsigned long nr_pages)
	70	{
	71	unsigned int index_to_dump;
	72	unsigned int i;
	73
	74	/*
	75	* Zero out any user-supplied page index that is out of range. Remember:
	76	* .which_pages[] contains a 1-based set of page indices.
	77	*/
	78	for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) {
	79	if (gup->which_pages[i] > nr_pages) {
	80	pr_warn("ZEROING due to out of range: .which_pages[%u]: %u\n",
	81	i, gup->which_pages[i]);
	82	gup->which_pages[i] = 0;
	83	}
	84	}
	85
	86	for (i = 0; i < GUP_TEST_MAX_PAGES_TO_DUMP; i++) {
	87	index_to_dump = gup->which_pages[i];
	88
	89	if (index_to_dump) {
	90	index_to_dump--; // Decode from 1-based, to 0-based
	91	pr_info("---- page #%u, starting from user virt addr: 0x%llx\n",
	92	index_to_dump, gup->addr);
	93	dump_page(pages[index_to_dump],
	94	"gup_test: dump_pages() test");
	95	}
	96	}
	97	}
	98
9c84f229 JH	99	static int __gup_test_ioctl(unsigned int cmd,
9c84f229 JH	100	struct gup_test *gup)
64c349f4 KS	101	{
64c349f4 KS	102	ktime_t start_time, end_time;
51896864	103	unsigned long i, nr_pages, addr, next;
79dbf135	104	long nr;
64c349f4	105	struct page **pages;
a7c46c0c	106	int ret = 0;
f3964599 JH	107	bool needs_mmap_lock =
f3964599 JH	108	cmd != GUP_FAST_BENCHMARK && cmd != PIN_FAST_BENCHMARK;
64c349f4	109
4b408c74 DC	110	if (gup->size > ULONG_MAX)
	111	return -EINVAL;
	112
64c349f4	113	nr_pages = gup->size / PAGE_SIZE;
778e1cdd	114	pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
64c349f4 KS	115	if (!pages)
	116	return -ENOMEM;
	117
f3964599 JH	118	if (needs_mmap_lock && mmap_read_lock_killable(current->mm)) {
	119	ret = -EINTR;
	120	goto free_pages;
	121	}
	122
64c349f4 KS	123	i = 0;
	124	nr = gup->nr_pages_per_call;
	125	start_time = ktime_get();
	126	for (addr = gup->addr; addr < gup->addr + gup->size; addr = next) {
	127	if (nr != gup->nr_pages_per_call)
	128	break;
	129
	130	next = addr + nr * PAGE_SIZE;
	131	if (next > gup->addr + gup->size) {
	132	next = gup->addr + gup->size;
	133	nr = (next - addr) / PAGE_SIZE;
	134	}
	135
714a3a1e KB	136	switch (cmd) {
714a3a1e KB	137	case GUP_FAST_BENCHMARK:
79dbf135	138	nr = get_user_pages_fast(addr, nr, gup->gup_flags,
714a3a1e KB	139	pages + i);
714a3a1e KB	140	break;
a9bed1e1	141	case GUP_BASIC_TEST:
79dbf135	142	nr = get_user_pages(addr, nr, gup->gup_flags, pages + i,
714a3a1e KB	143	NULL);
714a3a1e KB	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:
79dbf135	150	nr = pin_user_pages(addr, nr, gup->gup_flags, pages + i,
41c45d37 JH	151	NULL);
41c45d37 JH	152	break;
657d4f79 BS	153	case PIN_LONGTERM_BENCHMARK:
657d4f79 BS	154	nr = pin_user_pages(addr, nr,
79dbf135	155	gup->gup_flags \| FOLL_LONGTERM,
657d4f79 BS	156	pages + i, NULL);
657d4f79 BS	157	break;
f4f9bda4	158	case DUMP_USER_PAGES_TEST:
79dbf135 PT	159	if (gup->test_flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN)
79dbf135 PT	160	nr = pin_user_pages(addr, nr, gup->gup_flags,
f4f9bda4 JH	161	pages + i, NULL);
f4f9bda4 JH	162	else
79dbf135	163	nr = get_user_pages(addr, nr, gup->gup_flags,
f4f9bda4 JH	164	pages + i, NULL);
f4f9bda4 JH	165	break;
714a3a1e	166	default:
a7c46c0c	167	ret = -EINVAL;
f3964599	168	goto unlock;
714a3a1e KB	169	}
714a3a1e KB	170
09e35a4a MT	171	if (nr <= 0)
09e35a4a MT	172	break;
64c349f4 KS	173	i += nr;
	174	}
	175	end_time = ktime_get();
	176
41c45d37 JH	177	/* Shifting the meaning of nr_pages: now it is actual number pinned: */
	178	nr_pages = i;
	179
26db3d09	180	gup->get_delta_usec = ktime_us_delta(end_time, start_time);
64c349f4 KS	181	gup->size = addr - gup->addr;
64c349f4 KS	182
41c45d37 JH	183	/*
	184	* Take an un-benchmark-timed moment to verify DMA pinned
	185	* state: print a warning if any non-dma-pinned pages are found:
	186	*/
	187	verify_dma_pinned(cmd, pages, nr_pages);
	188
f4f9bda4 JH	189	if (cmd == DUMP_USER_PAGES_TEST)
	190	dump_pages_test(gup, pages, nr_pages);
	191
26db3d09	192	start_time = ktime_get();
41c45d37	193
79dbf135	194	put_back_pages(cmd, pages, nr_pages, gup->test_flags);
41c45d37	195
26db3d09 KB	196	end_time = ktime_get();
26db3d09 KB	197	gup->put_delta_usec = ktime_us_delta(end_time, start_time);
64c349f4	198
f3964599 JH	199	unlock:
	200	if (needs_mmap_lock)
	201	mmap_read_unlock(current->mm);
	202	free_pages:
64c349f4	203	kvfree(pages);
a7c46c0c	204	return ret;
64c349f4 KS	205	}
64c349f4 KS	206
c77369b4 DH	207	static DEFINE_MUTEX(pin_longterm_test_mutex);
	208	static struct page **pin_longterm_test_pages;
	209	static unsigned long pin_longterm_test_nr_pages;
	210
	211	static inline void pin_longterm_test_stop(void)
	212	{
	213	if (pin_longterm_test_pages) {
	214	if (pin_longterm_test_nr_pages)
	215	unpin_user_pages(pin_longterm_test_pages,
	216	pin_longterm_test_nr_pages);
61b963b5	217	kvfree(pin_longterm_test_pages);
c77369b4 DH	218	pin_longterm_test_pages = NULL;
	219	pin_longterm_test_nr_pages = 0;
	220	}
	221	}
	222
	223	static inline int pin_longterm_test_start(unsigned long arg)
	224	{
	225	long nr_pages, cur_pages, addr, remaining_pages;
	226	int gup_flags = FOLL_LONGTERM;
	227	struct pin_longterm_test args;
	228	struct page **pages;
	229	int ret = 0;
	230	bool fast;
	231
	232	if (pin_longterm_test_pages)
	233	return -EINVAL;
	234
	235	if (copy_from_user(&args, (void __user *)arg, sizeof(args)))
	236	return -EFAULT;
	237
	238	if (args.flags &
	239	~(PIN_LONGTERM_TEST_FLAG_USE_WRITE\|PIN_LONGTERM_TEST_FLAG_USE_FAST))
	240	return -EINVAL;
	241	if (!IS_ALIGNED(args.addr \| args.size, PAGE_SIZE))
	242	return -EINVAL;
	243	if (args.size > LONG_MAX)
	244	return -EINVAL;
	245	nr_pages = args.size / PAGE_SIZE;
	246	if (!nr_pages)
	247	return -EINVAL;
	248
	249	pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
	250	if (!pages)
	251	return -ENOMEM;
	252
	253	if (args.flags & PIN_LONGTERM_TEST_FLAG_USE_WRITE)
	254	gup_flags \|= FOLL_WRITE;
	255	fast = !!(args.flags & PIN_LONGTERM_TEST_FLAG_USE_FAST);
	256
	257	if (!fast && mmap_read_lock_killable(current->mm)) {
61b963b5	258	kvfree(pages);
c77369b4 DH	259	return -EINTR;
	260	}
	261
	262	pin_longterm_test_pages = pages;
	263	pin_longterm_test_nr_pages = 0;
	264
	265	while (nr_pages - pin_longterm_test_nr_pages) {
	266	remaining_pages = nr_pages - pin_longterm_test_nr_pages;
	267	addr = args.addr + pin_longterm_test_nr_pages * PAGE_SIZE;
	268
	269	if (fast)
	270	cur_pages = pin_user_pages_fast(addr, remaining_pages,
	271	gup_flags, pages);
	272	else
	273	cur_pages = pin_user_pages(addr, remaining_pages,
	274	gup_flags, pages, NULL);
	275	if (cur_pages < 0) {
	276	pin_longterm_test_stop();
	277	ret = cur_pages;
	278	break;
	279	}
	280	pin_longterm_test_nr_pages += cur_pages;
	281	pages += cur_pages;
	282	}
	283
	284	if (!fast)
	285	mmap_read_unlock(current->mm);
	286	return ret;
	287	}
	288
	289	static inline int pin_longterm_test_read(unsigned long arg)
	290	{
	291	__u64 user_addr;
	292	unsigned long i;
	293
	294	if (!pin_longterm_test_pages)
	295	return -EINVAL;
	296
	297	if (copy_from_user(&user_addr, (void __user *)arg, sizeof(user_addr)))
	298	return -EFAULT;
	299
	300	for (i = 0; i < pin_longterm_test_nr_pages; i++) {
a0ac9b35 DH	301	void *addr = kmap_local_page(pin_longterm_test_pages[i]);
a0ac9b35 DH	302	unsigned long ret;
c77369b4	303
a0ac9b35 DH	304	ret = copy_to_user((void __user *)(unsigned long)user_addr, addr,
	305	PAGE_SIZE);
	306	kunmap_local(addr);
	307	if (ret)
c77369b4 DH	308	return -EFAULT;
	309	user_addr += PAGE_SIZE;
	310	}
	311	return 0;
	312	}
	313
	314	static long pin_longterm_test_ioctl(struct file *filep, unsigned int cmd,
	315	unsigned long arg)
	316	{
	317	int ret = -EINVAL;
	318
	319	if (mutex_lock_killable(&pin_longterm_test_mutex))
	320	return -EINTR;
	321
	322	switch (cmd) {
	323	case PIN_LONGTERM_TEST_START:
	324	ret = pin_longterm_test_start(arg);
	325	break;
	326	case PIN_LONGTERM_TEST_STOP:
	327	pin_longterm_test_stop();
	328	ret = 0;
	329	break;
	330	case PIN_LONGTERM_TEST_READ:
	331	ret = pin_longterm_test_read(arg);
	332	break;
	333	}
	334
	335	mutex_unlock(&pin_longterm_test_mutex);
	336	return ret;
	337	}
	338
9c84f229	339	static long gup_test_ioctl(struct file *filep, unsigned int cmd,
64c349f4 KS	340	unsigned long arg)
64c349f4 KS	341	{
9c84f229	342	struct gup_test gup;
64c349f4 KS	343	int ret;
64c349f4 KS	344
714a3a1e KB	345	switch (cmd) {
714a3a1e KB	346	case GUP_FAST_BENCHMARK:
41c45d37	347	case PIN_FAST_BENCHMARK:
657d4f79	348	case PIN_LONGTERM_BENCHMARK:
a9bed1e1 JH	349	case GUP_BASIC_TEST:
a9bed1e1 JH	350	case PIN_BASIC_TEST:
f4f9bda4	351	case DUMP_USER_PAGES_TEST:
714a3a1e	352	break;
c77369b4 DH	353	case PIN_LONGTERM_TEST_START:
	354	case PIN_LONGTERM_TEST_STOP:
	355	case PIN_LONGTERM_TEST_READ:
	356	return pin_longterm_test_ioctl(filep, cmd, arg);
714a3a1e	357	default:
64c349f4	358	return -EINVAL;
714a3a1e	359	}
64c349f4 KS	360
	361	if (copy_from_user(&gup, (void __user *)arg, sizeof(gup)))
	362	return -EFAULT;
	363
9c84f229	364	ret = __gup_test_ioctl(cmd, &gup);
64c349f4 KS	365	if (ret)
	366	return ret;
	367
	368	if (copy_to_user((void __user *)arg, &gup, sizeof(gup)))
	369	return -EFAULT;
	370
	371	return 0;
	372	}
	373
c77369b4 DH	374	static int gup_test_release(struct inode inode, struct file file)
	375	{
	376	pin_longterm_test_stop();
	377
	378	return 0;
	379	}
	380
9c84f229	381	static const struct file_operations gup_test_fops = {
64c349f4	382	.open = nonseekable_open,
9c84f229	383	.unlocked_ioctl = gup_test_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);