diff options
Diffstat (limited to 'mm/gup_benchmark.c')
| -rw-r--r-- | mm/gup_benchmark.c | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c deleted file mode 100644 index be690fa66a46..000000000000 --- a/mm/gup_benchmark.c +++ /dev/null @@ -1,200 +0,0 @@ -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/uaccess.h> -#include <linux/ktime.h> -#include <linux/debugfs.h> - -#define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark) -#define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) -#define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) -#define PIN_FAST_BENCHMARK _IOWR('g', 4, struct gup_benchmark) -#define PIN_BENCHMARK _IOWR('g', 5, struct gup_benchmark) - -struct gup_benchmark { - __u64 get_delta_usec; - __u64 put_delta_usec; - __u64 addr; - __u64 size; - __u32 nr_pages_per_call; - __u32 flags; - __u64 expansion[10]; /* For future use */ -}; - -static void put_back_pages(unsigned int cmd, struct page **pages, - unsigned long nr_pages) -{ - unsigned long i; - - switch (cmd) { - case GUP_FAST_BENCHMARK: - case GUP_LONGTERM_BENCHMARK: - case GUP_BENCHMARK: - for (i = 0; i < nr_pages; i++) - put_page(pages[i]); - break; - - case PIN_FAST_BENCHMARK: - case PIN_BENCHMARK: - unpin_user_pages(pages, nr_pages); - 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_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_benchmark failure"); - break; - } - } - break; - } -} - -static int __gup_benchmark_ioctl(unsigned int cmd, - struct gup_benchmark *gup) -{ - ktime_t start_time, end_time; - unsigned long i, nr_pages, addr, next; - int nr; - struct page **pages; - int ret = 0; - - 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; - - 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_LONGTERM_BENCHMARK: - nr = get_user_pages(addr, nr, - gup->flags | FOLL_LONGTERM, - pages + i, NULL); - break; - case GUP_BENCHMARK: - 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_BENCHMARK: - nr = pin_user_pages(addr, nr, gup->flags, pages + i, - NULL); - break; - default: - kvfree(pages); - ret = -EINVAL; - goto out; - } - - 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); - - start_time = ktime_get(); - - put_back_pages(cmd, pages, nr_pages); - - end_time = ktime_get(); - gup->put_delta_usec = ktime_us_delta(end_time, start_time); - - kvfree(pages); -out: - return ret; -} - -static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd, - unsigned long arg) -{ - struct gup_benchmark gup; - int ret; - - switch (cmd) { - case GUP_FAST_BENCHMARK: - case GUP_LONGTERM_BENCHMARK: - case GUP_BENCHMARK: - case PIN_FAST_BENCHMARK: - case PIN_BENCHMARK: - break; - default: - return -EINVAL; - } - - if (copy_from_user(&gup, (void __user *)arg, sizeof(gup))) - return -EFAULT; - - ret = __gup_benchmark_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_benchmark_fops = { - .open = nonseekable_open, - .unlocked_ioctl = gup_benchmark_ioctl, -}; - -static int gup_benchmark_init(void) -{ - debugfs_create_file_unsafe("gup_benchmark", 0600, NULL, NULL, - &gup_benchmark_fops); - - return 0; -} - -late_initcall(gup_benchmark_init); |