// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#define __EXPORTED_HEADERS__

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <malloc.h>
#include <stdbool.h>

#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#include <linux/memfd.h>
#include <linux/udmabuf.h>
#include "kselftest.h"

#define TEST_PREFIX     "drivers/dma-buf/udmabuf"
#define NUM_PAGES       4
#define NUM_ENTRIES     4
#define MEMFD_SIZE      1024 /* in pages */

static unsigned int page_size;

static int create_memfd_with_seals(off64_t size, bool hpage)
{
        int memfd, ret;
        unsigned int flags = MFD_ALLOW_SEALING;

        if (hpage)
                flags |= MFD_HUGETLB;

        memfd = memfd_create("udmabuf-test", flags);
        if (memfd < 0) {
                ksft_print_msg("%s: [skip,no-memfd]\n", TEST_PREFIX);
                exit(KSFT_SKIP);
        }

        ret = fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK);
        if (ret < 0) {
                ksft_print_msg("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
                exit(KSFT_SKIP);
        }

        ret = ftruncate(memfd, size);
        if (ret == -1) {
                ksft_print_msg("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
                exit(KSFT_FAIL);
        }

        return memfd;
}

static int create_udmabuf_list(int devfd, int memfd, off64_t memfd_size)
{
        struct udmabuf_create_list *list;
        int ubuf_fd, i;

        list = malloc(sizeof(struct udmabuf_create_list) +
                      sizeof(struct udmabuf_create_item) * NUM_ENTRIES);
        if (!list) {
                ksft_print_msg("%s: [FAIL, udmabuf-malloc]\n", TEST_PREFIX);
                exit(KSFT_FAIL);
        }

        for (i = 0; i < NUM_ENTRIES; i++) {
                list->list[i].memfd  = memfd;
                list->list[i].offset = i * (memfd_size / NUM_ENTRIES);
                list->list[i].size   = getpagesize() * NUM_PAGES;
        }

        list->count = NUM_ENTRIES;
        list->flags = UDMABUF_FLAGS_CLOEXEC;
        ubuf_fd = ioctl(devfd, UDMABUF_CREATE_LIST, list);
        free(list);
        if (ubuf_fd < 0) {
                ksft_print_msg("%s: [FAIL, udmabuf-create]\n", TEST_PREFIX);
                exit(KSFT_FAIL);
        }

        return ubuf_fd;
}

static void write_to_memfd(void *addr, off64_t size, char chr)
{
        int i;

        for (i = 0; i < size / page_size; i++) {
                *((char *)addr + (i * page_size)) = chr;
        }
}

static void *mmap_fd(int fd, off64_t size)
{
        void *addr;

        addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
        if (addr == MAP_FAILED) {
                ksft_print_msg("%s: ubuf_fd mmap fail\n", TEST_PREFIX);
                exit(KSFT_FAIL);
        }

        return addr;
}

static int compare_chunks(void *addr1, void *addr2, off64_t memfd_size)
{
        off64_t off;
        int i = 0, j, k = 0, ret = 0;
        char char1, char2;

        while (i < NUM_ENTRIES) {
                off = i * (memfd_size / NUM_ENTRIES);
                for (j = 0; j < NUM_PAGES; j++, k++) {
                        char1 = *((char *)addr1 + off + (j * getpagesize()));
                        char2 = *((char *)addr2 + (k * getpagesize()));
                        if (char1 != char2) {
                                ret = -1;
                                goto err;
                        }
                }
                i++;
        }
err:
        munmap(addr1, memfd_size);
        munmap(addr2, NUM_ENTRIES * NUM_PAGES * getpagesize());
        return ret;
}

int main(int argc, char *argv[])
{
        struct udmabuf_create create;
        int devfd, memfd, buf, ret;
        off64_t size;
        void *addr1, *addr2;

        ksft_print_header();
        ksft_set_plan(7);

        devfd = open("/dev/udmabuf", O_RDWR);
        if (devfd < 0) {
                ksft_print_msg(
                        "%s: [skip,no-udmabuf: Unable to access DMA buffer device file]\n",
                        TEST_PREFIX);
                exit(KSFT_SKIP);
        }

        memfd = memfd_create("udmabuf-test", MFD_ALLOW_SEALING);
        if (memfd < 0) {
                ksft_print_msg("%s: [skip,no-memfd]\n", TEST_PREFIX);
                exit(KSFT_SKIP);
        }

        ret = fcntl(memfd, F_ADD_SEALS, F_SEAL_SHRINK);
        if (ret < 0) {
                ksft_print_msg("%s: [skip,fcntl-add-seals]\n", TEST_PREFIX);
                exit(KSFT_SKIP);
        }

        size = getpagesize() * NUM_PAGES;
        ret = ftruncate(memfd, size);
        if (ret == -1) {
                ksft_print_msg("%s: [FAIL,memfd-truncate]\n", TEST_PREFIX);
                exit(KSFT_FAIL);
        }

        memset(&create, 0, sizeof(create));

        /* should fail (offset not page aligned) */
        create.memfd  = memfd;
        create.offset = getpagesize()/2;
        create.size   = getpagesize();
        buf = ioctl(devfd, UDMABUF_CREATE, &create);
        if (buf >= 0)
                ksft_test_result_fail("%s: [FAIL,test-1]\n", TEST_PREFIX);
        else
                ksft_test_result_pass("%s: [PASS,test-1]\n", TEST_PREFIX);

        /* should fail (size not multiple of page) */
        create.memfd  = memfd;
        create.offset = 0;
        create.size   = getpagesize()/2;
        buf = ioctl(devfd, UDMABUF_CREATE, &create);
        if (buf >= 0)
                ksft_test_result_fail("%s: [FAIL,test-2]\n", TEST_PREFIX);
        else
                ksft_test_result_pass("%s: [PASS,test-2]\n", TEST_PREFIX);

        /* should fail (not memfd) */
        create.memfd  = 0; /* stdin */
        create.offset = 0;
        create.size   = size;
        buf = ioctl(devfd, UDMABUF_CREATE, &create);
        if (buf >= 0)
                ksft_test_result_fail("%s: [FAIL,test-3]\n", TEST_PREFIX);
        else
                ksft_test_result_pass("%s: [PASS,test-3]\n", TEST_PREFIX);

        /* should work */
        page_size = getpagesize();
        addr1 = mmap_fd(memfd, size);
        write_to_memfd(addr1, size, 'a');
        create.memfd  = memfd;
        create.offset = 0;
        create.size   = size;
        buf = ioctl(devfd, UDMABUF_CREATE, &create);
        if (buf < 0)
                ksft_test_result_fail("%s: [FAIL,test-4]\n", TEST_PREFIX);
        else
                ksft_test_result_pass("%s: [PASS,test-4]\n", TEST_PREFIX);

        munmap(addr1, size);
        close(buf);
        close(memfd);

        /* should work (migration of 4k size pages)*/
        size = MEMFD_SIZE * page_size;
        memfd = create_memfd_with_seals(size, false);
        addr1 = mmap_fd(memfd, size);
        write_to_memfd(addr1, size, 'a');
        buf = create_udmabuf_list(devfd, memfd, size);
        addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
        write_to_memfd(addr1, size, 'b');
        ret = compare_chunks(addr1, addr2, size);
        if (ret < 0)
                ksft_test_result_fail("%s: [FAIL,test-5]\n", TEST_PREFIX);
        else
                ksft_test_result_pass("%s: [PASS,test-5]\n", TEST_PREFIX);

        close(buf);
        close(memfd);

        /* should work (migration of 2MB size huge pages)*/
        page_size = getpagesize() * 512; /* 2 MB */
        size = MEMFD_SIZE * page_size;
        memfd = create_memfd_with_seals(size, true);
        addr1 = mmap_fd(memfd, size);
        write_to_memfd(addr1, size, 'a');
        buf = create_udmabuf_list(devfd, memfd, size);
        addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
        write_to_memfd(addr1, size, 'b');
        ret = compare_chunks(addr1, addr2, size);
        if (ret < 0)
                ksft_test_result_fail("%s: [FAIL,test-6]\n", TEST_PREFIX);
        else
                ksft_test_result_pass("%s: [PASS,test-6]\n", TEST_PREFIX);

        close(buf);
        close(memfd);

        /* same test as above but we pin first before writing to memfd */
        page_size = getpagesize() * 512; /* 2 MB */
        size = MEMFD_SIZE * page_size;
        memfd = create_memfd_with_seals(size, true);
        buf = create_udmabuf_list(devfd, memfd, size);
        addr2 = mmap_fd(buf, NUM_PAGES * NUM_ENTRIES * getpagesize());
        addr1 = mmap_fd(memfd, size);
        write_to_memfd(addr1, size, 'a');
        write_to_memfd(addr1, size, 'b');
        ret = compare_chunks(addr1, addr2, size);
        if (ret < 0)
                ksft_test_result_fail("%s: [FAIL,test-7]\n", TEST_PREFIX);
        else
                ksft_test_result_pass("%s: [PASS,test-7]\n", TEST_PREFIX);

        close(buf);
        close(memfd);
        close(devfd);

        ksft_print_msg("%s: ok\n", TEST_PREFIX);
        ksft_print_cnts();

        return 0;
}