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selftests/udmabuf: add tests to verify data after page migration
Since the memfd pages associated with a udmabuf may be migrated as part of udmabuf create, we need to verify the data coherency after successful migration. The new tests added in this patch try to do just that using 4k sized pages and also 2 MB sized huge pages for the memfd. Successful completion of the tests would mean that there is no disconnect between the memfd pages and the ones associated with a udmabuf. And, these tests can also be augmented in the future to test newer udmabuf features (such as handling memfd hole punch). The idea for these tests comes from a patch by Mike Kravetz here: https://lists.freedesktop.org/archives/dri-devel/2023-June/410623.html v1->v2: (suggestions from Shuah) - Use ksft_* functions to print and capture results of tests - Use appropriate KSFT_* status codes for exit() - Add Mike Kravetz's suggested-by tag Link: https://lkml.kernel.org/r/20240624063952.1572359-10-vivek.kasireddy@intel.com Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com> Suggested-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Dave Airlie <airlied@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Hugh Dickins <hughd@google.com> Cc: Peter Xu <peterx@redhat.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Dongwon Kim <dongwon.kim@intel.com> Cc: Junxiao Chang <junxiao.chang@intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@infradead.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Oscar Salvador <osalvador@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vivek Kasireddy
Andrew Morton
parent
c6a3194c05
commit
8d42e2a91d
@ -9,52 +9,162 @@
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#include <errno.h>
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#include <fcntl.h>
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#include <malloc.h>
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#include <stdbool.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <sys/mman.h>
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#include <linux/memfd.h>
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#include <linux/udmabuf.h>
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#include "../../kselftest.h"
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#define TEST_PREFIX "drivers/dma-buf/udmabuf"
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#define NUM_PAGES 4
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#define NUM_ENTRIES 4
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#define MEMFD_SIZE 1024 /* in pages */
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static int memfd_create(const char *name, unsigned int flags)
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static unsigned int page_size;
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static int create_memfd_with_seals(off64_t size, bool hpage)
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{
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return syscall(__NR_memfd_create, name, flags);
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int memfd, ret;
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unsigned int flags = MFD_ALLOW_SEALING;
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if (hpage)
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flags |= MFD_HUGETLB;
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memfd = memfd_create("udmabuf-test", flags);
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if (memfd < 0) {
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ksft_print_msg("%s: [skip,no-memfd]\n", TEST_PREFIX);
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exit(KSFT_SKIP);
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}
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ret = fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK);
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if (ret < 0) {
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ksft_print_msg("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
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exit(KSFT_SKIP);
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}
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ret = ftruncate(memfd, size);
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if (ret == -1) {
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ksft_print_msg("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
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exit(KSFT_FAIL);
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}
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return memfd;
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}
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static int create_udmabuf_list(int devfd, int memfd, off64_t memfd_size)
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{
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struct udmabuf_create_list *list;
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int ubuf_fd, i;
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list = malloc(sizeof(struct udmabuf_create_list) +
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sizeof(struct udmabuf_create_item) * NUM_ENTRIES);
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if (!list) {
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ksft_print_msg("%s: [FAIL, udmabuf-malloc]\n", TEST_PREFIX);
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exit(KSFT_FAIL);
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}
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for (i = 0; i < NUM_ENTRIES; i++) {
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list->list[i].memfd = memfd;
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list->list[i].offset = i * (memfd_size / NUM_ENTRIES);
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list->list[i].size = getpagesize() * NUM_PAGES;
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}
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list->count = NUM_ENTRIES;
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list->flags = UDMABUF_FLAGS_CLOEXEC;
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ubuf_fd = ioctl(devfd, UDMABUF_CREATE_LIST, list);
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free(list);
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if (ubuf_fd < 0) {
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ksft_print_msg("%s: [FAIL, udmabuf-create]\n", TEST_PREFIX);
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exit(KSFT_FAIL);
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}
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return ubuf_fd;
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}
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static void write_to_memfd(void *addr, off64_t size, char chr)
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{
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int i;
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for (i = 0; i < size / page_size; i++) {
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*((char *)addr + (i * page_size)) = chr;
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}
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}
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static void *mmap_fd(int fd, off64_t size)
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{
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void *addr;
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addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (addr == MAP_FAILED) {
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ksft_print_msg("%s: ubuf_fd mmap fail\n", TEST_PREFIX);
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exit(KSFT_FAIL);
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}
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return addr;
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}
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static int compare_chunks(void *addr1, void *addr2, off64_t memfd_size)
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{
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off64_t off;
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int i = 0, j, k = 0, ret = 0;
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char char1, char2;
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while (i < NUM_ENTRIES) {
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off = i * (memfd_size / NUM_ENTRIES);
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for (j = 0; j < NUM_PAGES; j++, k++) {
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char1 = *((char *)addr1 + off + (j * getpagesize()));
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char2 = *((char *)addr2 + (k * getpagesize()));
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if (char1 != char2) {
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ret = -1;
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goto err;
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}
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}
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i++;
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}
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err:
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munmap(addr1, memfd_size);
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munmap(addr2, NUM_ENTRIES * NUM_PAGES * getpagesize());
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return ret;
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}
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int main(int argc, char *argv[])
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{
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struct udmabuf_create create;
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int devfd, memfd, buf, ret;
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off_t size;
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void *mem;
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off64_t size;
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void *addr1, *addr2;
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ksft_print_header();
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ksft_set_plan(6);
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devfd = open("/dev/udmabuf", O_RDWR);
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if (devfd < 0) {
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printf("%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n",
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TEST_PREFIX);
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exit(77);
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ksft_print_msg(
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"%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n",
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TEST_PREFIX);
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exit(KSFT_SKIP);
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}
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memfd = memfd_create("udmabuf-test", MFD_ALLOW_SEALING);
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if (memfd < 0) {
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printf("%s: [skip,no-memfd]\n", TEST_PREFIX);
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exit(77);
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ksft_print_msg("%s: [skip,no-memfd]\n", TEST_PREFIX);
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exit(KSFT_SKIP);
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}
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ret = fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK);
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if (ret < 0) {
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printf("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
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exit(77);
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ksft_print_msg("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
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exit(KSFT_SKIP);
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}
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size = getpagesize() * NUM_PAGES;
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ret = ftruncate(memfd, size);
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if (ret == -1) {
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printf("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
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exit(1);
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ksft_print_msg("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
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exit(KSFT_FAIL);
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}
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memset(&create, 0, sizeof(create));
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@ -64,44 +174,86 @@ int main(int argc, char *argv[])
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create.offset = getpagesize()/2;
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create.size = getpagesize();
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buf = ioctl(devfd, UDMABUF_CREATE, &create);
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if (buf >= 0) {
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printf("%s: [FAIL,test-1]\n", TEST_PREFIX);
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exit(1);
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}
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if (buf >= 0)
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ksft_test_result_fail("%s: [FAIL,test-1]\n", TEST_PREFIX);
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else
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ksft_test_result_pass("%s: [PASS,test-1]\n", TEST_PREFIX);
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/* should fail (size not multiple of page) */
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create.memfd = memfd;
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create.offset = 0;
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create.size = getpagesize()/2;
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buf = ioctl(devfd, UDMABUF_CREATE, &create);
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if (buf >= 0) {
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printf("%s: [FAIL,test-2]\n", TEST_PREFIX);
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exit(1);
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}
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if (buf >= 0)
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ksft_test_result_fail("%s: [FAIL,test-2]\n", TEST_PREFIX);
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else
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ksft_test_result_pass("%s: [PASS,test-2]\n", TEST_PREFIX);
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/* should fail (not memfd) */
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create.memfd = 0; /* stdin */
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create.offset = 0;
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create.size = size;
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buf = ioctl(devfd, UDMABUF_CREATE, &create);
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if (buf >= 0) {
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printf("%s: [FAIL,test-3]\n", TEST_PREFIX);
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exit(1);
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}
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if (buf >= 0)
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ksft_test_result_fail("%s: [FAIL,test-3]\n", TEST_PREFIX);
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else
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ksft_test_result_pass("%s: [PASS,test-3]\n", TEST_PREFIX);
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/* should work */
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page_size = getpagesize();
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addr1 = mmap_fd(memfd, size);
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write_to_memfd(addr1, size, 'a');
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create.memfd = memfd;
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create.offset = 0;
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create.size = size;
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buf = ioctl(devfd, UDMABUF_CREATE, &create);
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if (buf < 0) {
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printf("%s: [FAIL,test-4]\n", TEST_PREFIX);
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exit(1);
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}
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if (buf < 0)
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ksft_test_result_fail("%s: [FAIL,test-4]\n", TEST_PREFIX);
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else
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ksft_test_result_pass("%s: [PASS,test-4]\n", TEST_PREFIX);
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munmap(addr1, size);
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close(buf);
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close(memfd);
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/* should work (migration of 4k size pages)*/
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size = MEMFD_SIZE * page_size;
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memfd = create_memfd_with_seals(size, false);
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addr1 = mmap_fd(memfd, size);
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write_to_memfd(addr1, size, 'a');
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buf = create_udmabuf_list(devfd, memfd, size);
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addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
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write_to_memfd(addr1, size, 'b');
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ret = compare_chunks(addr1, addr2, size);
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if (ret < 0)
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ksft_test_result_fail("%s: [FAIL,test-5]\n", TEST_PREFIX);
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else
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ksft_test_result_pass("%s: [PASS,test-5]\n", TEST_PREFIX);
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close(buf);
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close(memfd);
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/* should work (migration of 2MB size huge pages)*/
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page_size = getpagesize() * 512; /* 2 MB */
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size = MEMFD_SIZE * page_size;
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memfd = create_memfd_with_seals(size, true);
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addr1 = mmap_fd(memfd, size);
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write_to_memfd(addr1, size, 'a');
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buf = create_udmabuf_list(devfd, memfd, size);
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addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
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write_to_memfd(addr1, size, 'b');
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ret = compare_chunks(addr1, addr2, size);
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if (ret < 0)
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ksft_test_result_fail("%s: [FAIL,test-6]\n", TEST_PREFIX);
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else
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ksft_test_result_pass("%s: [PASS,test-6]\n", TEST_PREFIX);
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fprintf(stderr, "%s: ok\n", TEST_PREFIX);
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close(buf);
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close(memfd);
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close(devfd);
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ksft_print_msg("%s: ok\n", TEST_PREFIX);
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ksft_print_cnts();
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return 0;
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}
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