mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Barry Song](/assets/img/avatar_default.png)
gup_test_init() is only called during initialization, mark it as __init to save some memory. Link: https://lkml.kernel.org/r/20201103081016.16532-1-song.bao.hua@hisilicon.com Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
247 lines
5.4 KiB
C
247 lines
5.4 KiB
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 "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;
|
|
}
|
|
}
|
|
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;
|
|
int 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;
|
|
}
|
|
|
|
/* Filter out most gup flags: only allow a tiny subset here: */
|
|
gup->flags &= FOLL_WRITE;
|
|
|
|
switch (cmd) {
|
|
case GUP_FAST_BENCHMARK:
|
|
nr = get_user_pages_fast(addr, nr, gup->flags,
|
|
pages + i);
|
|
break;
|
|
case GUP_BASIC_TEST:
|
|
nr = get_user_pages(addr, nr, gup->flags, pages + i,
|
|
NULL);
|
|
break;
|
|
case PIN_FAST_BENCHMARK:
|
|
nr = pin_user_pages_fast(addr, nr, gup->flags,
|
|
pages + i);
|
|
break;
|
|
case PIN_BASIC_TEST:
|
|
nr = pin_user_pages(addr, nr, gup->flags, pages + i,
|
|
NULL);
|
|
break;
|
|
case PIN_LONGTERM_BENCHMARK:
|
|
nr = pin_user_pages(addr, nr,
|
|
gup->flags | FOLL_LONGTERM,
|
|
pages + i, NULL);
|
|
break;
|
|
case DUMP_USER_PAGES_TEST:
|
|
if (gup->flags & GUP_TEST_FLAG_DUMP_PAGES_USE_PIN)
|
|
nr = pin_user_pages(addr, nr, gup->flags,
|
|
pages + i, NULL);
|
|
else
|
|
nr = get_user_pages(addr, nr, 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->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 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;
|
|
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 const struct file_operations gup_test_fops = {
|
|
.open = nonseekable_open,
|
|
.unlocked_ioctl = gup_test_ioctl,
|
|
};
|
|
|
|
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);
|