[Intel-gfx] [RFC PATCH] tests/gem_userptr_blits: Check for banned mmap-offset
Marcin Bernatowicz
marcin.bernatowicz at linux.intel.com
Thu Apr 15 09:47:29 UTC 2021
On Fri, 2021-04-09 at 10:57 +0200, Janusz Krzysztofik wrote:
> Support for mmap-offset to userptr has been obsoleted, then related
> lockdep splat reported issues are not going to be resolved other than
> still banning mmap-offset to userptr attempts.
>
> Replace "mmap-offset-invalidate-*" and "readonly-mmap-unsync"
> subtests
> which now skip with a negative "mmap-offset-banned" that fails if a
> mmap-offset attempt to a userptr object doesn't return ENODEV. Also,
> remove mmap-offset to userptr dependent processing paths from other
> subtest bodies and drop obsolete subtest variants.
>
> Signed-off-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com
> >
> ---
> tests/i915/gem_userptr_blits.c | 324 +++--------------------------
> ----
> 1 file changed, 30 insertions(+), 294 deletions(-)
>
> diff --git a/tests/i915/gem_userptr_blits.c
> b/tests/i915/gem_userptr_blits.c
> index 7a80c0161..aad5f141b 100644
> --- a/tests/i915/gem_userptr_blits.c
> +++ b/tests/i915/gem_userptr_blits.c
> @@ -70,52 +70,12 @@
> #endif
>
> static uint32_t userptr_flags;
> -static bool *can_mmap;
>
> #define WIDTH 512
> #define HEIGHT 512
>
> static uint32_t linear[WIDTH*HEIGHT];
>
> -static bool has_mmap(int i915, const struct mmap_offset *t)
> -{
> - void *ptr, *map;
> - uint32_t handle;
> -
> - handle = gem_create(i915, PAGE_SIZE);
> - map = __gem_mmap_offset(i915, handle, 0, PAGE_SIZE, PROT_WRITE,
> - t->type);
> - gem_close(i915, handle);
> - if (map) {
> - munmap(map, PAGE_SIZE);
> - } else {
> - igt_debug("no HW / kernel support for mmap-
> offset(%s)\n",
> - t->name);
> - return false;
> - }
> - map = NULL;
> -
> - igt_assert(posix_memalign(&ptr, PAGE_SIZE, PAGE_SIZE) == 0);
> -
> - if (__gem_userptr(i915, ptr, 4096, 0,
> - I915_USERPTR_UNSYNCHRONIZED, &handle))
> - goto out_ptr;
> - igt_assert(handle != 0);
> -
> - map = __gem_mmap_offset(i915, handle, 0, 4096, PROT_WRITE, t-
> >type);
> - if (map)
> - munmap(map, 4096);
> - else
> - igt_debug("mmap-offset(%s) banned, lockdep loop
> prevention\n",
> - t->name);
> -
> - gem_close(i915, handle);
> -out_ptr:
> - free(ptr);
> -
> - return map != NULL;
> -}
> -
> static void gem_userptr_test_unsynchronized(void)
> {
> userptr_flags = I915_USERPTR_UNSYNCHRONIZED;
> @@ -914,28 +874,13 @@ static int test_invalid_mapping(int fd, const
> struct mmap_offset *t)
> }
>
> #define PE_BUSY 0x1
> -static void test_process_exit(int fd, const struct mmap_offset *mmo,
> int flags)
> +static void test_process_exit(int fd, int flags)
> {
> - if (mmo)
> - igt_require_f(can_mmap[mmo->type],
> - "HW & kernel support for LLC and mmap-
> offset(%s) over userptr\n",
> - mmo->name);
> -
> igt_fork(child, 1) {
> uint32_t handle;
>
> handle = create_userptr_bo(fd, sizeof(linear));
>
> - if (mmo) {
> - uint32_t *ptr;
> -
> - ptr = __gem_mmap_offset(fd, handle, 0,
> sizeof(linear),
> - PROT_READ | PROT_WRITE,
> - mmo->type);
> - if (ptr)
> - *ptr = 0;
> - }
> -
> if (flags & PE_BUSY)
> igt_assert_eq(copy(fd, handle, handle), 0);
> }
> @@ -1064,53 +1009,30 @@ static int test_map_fixed_invalidate(int fd,
> uint32_t flags,
> return 0;
> }
>
> -static void test_mmap_offset_invalidate(int fd,
> - const struct mmap_offset *t,
> - unsigned int flags)
> -#define MMOI_ACTIVE (1u << 0)
> +static void test_mmap_offset_banned(int fd, const struct mmap_offset
> *t)
> {
> - igt_spin_t *spin = NULL;
> - uint32_t handle;
> - uint32_t *map;
> + struct drm_i915_gem_mmap_offset arg;
> void *ptr;
>
> /* check if mmap_offset type is supported by hardware, skip if
> not */
> - handle = gem_create(fd, PAGE_SIZE);
> - map = __gem_mmap_offset(fd, handle, 0, PAGE_SIZE,
> - PROT_READ | PROT_WRITE, t->type);
> - igt_require_f(map,
> - "HW & kernel support for mmap_offset(%s)\n", t-
> >name);
> - munmap(map, PAGE_SIZE);
> - gem_close(fd, handle);
> + memset(&arg, 0, sizeof(arg));
> + arg.flags = t->type;
> + arg.handle = gem_create(fd, PAGE_SIZE);
> + igt_skip_on_f(igt_ioctl(fd, DRM_IOCTL_I915_GEM_MMAP_OFFSET,
> &arg),
> + "HW & kernel support for
> mmap_offset(%s)\n", t->name);
> + gem_close(fd, arg.handle);
>
> /* create userptr object */
> + memset(&arg, 0, sizeof(arg));
> + arg.flags = t->type;
> igt_assert_eq(posix_memalign(&ptr, PAGE_SIZE, PAGE_SIZE), 0);
> - gem_userptr(fd, ptr, PAGE_SIZE, 0, userptr_flags, &handle);
> + gem_userptr(fd, ptr, PAGE_SIZE, 0, userptr_flags, &arg.handle);
>
> - /* set up mmap-offset mapping on top of the object, skip if
> refused */
> - map = __gem_mmap_offset(fd, handle, 0, PAGE_SIZE,
> - PROT_READ | PROT_WRITE, t->type);
> - igt_require_f(map, "mmap-offset banned, lockdep loop
> prevention\n");
> -
> - /* set object pages in order to activate MMU notifier for it */
> - gem_set_domain(fd, handle, t->domain, t->domain);
> - *map = 0;
> -
> - if (flags & MMOI_ACTIVE) {
> - gem_quiescent_gpu(fd);
> - spin = igt_spin_new(fd,
> - .dependency = handle,
> - .flags = IGT_SPIN_NO_PREEMPTION);
> - igt_spin_set_timeout(spin, NSEC_PER_SEC); /* XXX borked
> */
> - }
> + /* try to set up mmap-offset mapping on top of the object, fail
> if not banned */
> + do_ioctl_err(fd, DRM_IOCTL_I915_GEM_MMAP_OFFSET, &arg, ENODEV);
>
> - /* trigger the notifier */
> + gem_close(fd, arg.handle);
> munmap(ptr, PAGE_SIZE);
> -
> - /* cleanup */
> - igt_spin_free(fd, spin);
> - munmap(map, PAGE_SIZE);
> - gem_close(fd, handle);
> }
>
> static int test_forbidden_ops(int fd)
> @@ -1195,36 +1117,28 @@ static void (* volatile orig_sigbus)(int sig,
> siginfo_t *info, void *param);
> static volatile unsigned long sigbus_start;
> static volatile long sigbus_cnt = -1;
>
> -static void *umap(int fd, uint32_t handle, const struct mmap_offset
> *mmo)
> +static void *umap(int fd, uint32_t handle)
> {
> void *ptr;
> + uint32_t tmp = gem_create(fd, sizeof(linear));
>
> - if (mmo) {
> - ptr = __gem_mmap_offset(fd, handle, 0, sizeof(linear),
> - PROT_READ | PROT_WRITE, mmo-
> >type);
> - igt_assert(ptr);
> - } else {
> - uint32_t tmp = gem_create(fd, sizeof(linear));
> - igt_assert_eq(copy(fd, tmp, handle), 0);
> - ptr = gem_mmap__cpu(fd, tmp, 0, sizeof(linear),
> PROT_READ);
> - gem_close(fd, tmp);
> - }
> + igt_assert_eq(copy(fd, tmp, handle), 0);
> + ptr = gem_mmap__cpu(fd, tmp, 0, sizeof(linear), PROT_READ);
> + gem_close(fd, tmp);
>
> return ptr;
> }
>
> static void
> -check_bo(int fd1, uint32_t handle1, int is_userptr, int fd2,
> uint32_t handle2,
> - const struct mmap_offset *mmo)
> +check_bo(int fd1, uint32_t handle1, int is_userptr, int fd2,
> uint32_t handle2)
> {
> unsigned char *ptr1, *ptr2;
> - unsigned long size = sizeof(linear);
>
> - ptr2 = umap(fd2, handle2, mmo);
> + ptr2 = umap(fd2, handle2);
> if (is_userptr)
> ptr1 = is_userptr > 0 ? get_handle_ptr(handle1) : ptr2;
> else
> - ptr1 = umap(fd1, handle1, mmo);
> + ptr1 = umap(fd1, handle1);
>
> igt_assert(ptr1);
> igt_assert(ptr2);
> @@ -1232,12 +1146,6 @@ check_bo(int fd1, uint32_t handle1, int
> is_userptr, int fd2, uint32_t handle2,
> sigbus_start = (unsigned long)ptr2;
> igt_assert(memcmp(ptr1, ptr2, sizeof(linear)) == 0);
>
> - if (mmo) {
> - counter++;
> - memset(ptr1, counter, size);
> - memset(ptr2, counter, size);
> - }
> -
> if (!is_userptr)
> munmap(ptr1, sizeof(linear));
> munmap(ptr2, sizeof(linear));
> @@ -1260,47 +1168,15 @@ static int export_handle(int fd, uint32_t
> handle, int *outfd)
> return ret;
> }
>
> -static void sigbus(int sig, siginfo_t *info, void *param)
> -{
> - unsigned long ptr = (unsigned long)info->si_addr;
> - void *addr;
> -
> - if (ptr >= sigbus_start &&
> - ptr < sigbus_start + sizeof(linear)) {
> - /* replace mapping to allow progress */
> - munmap((void *)sigbus_start, sizeof(linear));
> - addr = mmap((void *)sigbus_start, sizeof(linear),
> - PROT_READ | PROT_WRITE,
> - MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED,
> -1, 0);
> - igt_assert((unsigned long)addr == sigbus_start);
> - memset(addr, counter, sizeof(linear));
> -
> - sigbus_cnt++;
> - return;
> - }
> -
> - if (orig_sigbus)
> - orig_sigbus(sig, info, param);
> - igt_assert(0);
> -}
> -
> static int test_dmabuf(void)
> {
> int fd1, fd2;
> uint32_t handle, handle_import;
> int dma_buf_fd = -1;
> int ret;
> - const struct mmap_offset *mmo = NULL;
>
> fd1 = drm_open_driver(DRIVER_INTEL);
>
> - for_each_mmap_offset_type(fd1, t)
> - if (can_mmap[t->type]) {
> - igt_debug("using mmap-offset(%s)\n", t->name);
> - mmo = t;
> - break;
> - }
> -
> handle = create_userptr_bo(fd1, sizeof(linear));
> memset(get_handle_ptr(handle), counter, sizeof(linear));
>
> @@ -1317,35 +1193,16 @@ static int test_dmabuf(void)
>
> fd2 = drm_open_driver(DRIVER_INTEL);
> handle_import = prime_fd_to_handle(fd2, dma_buf_fd);
> - check_bo(fd1, handle, 1, fd2, handle_import, mmo);
> + check_bo(fd1, handle, 1, fd2, handle_import);
>
> /* close dma_buf, check whether nothing disappears. */
> close(dma_buf_fd);
> - check_bo(fd1, handle, 1, fd2, handle_import, mmo);
> + check_bo(fd1, handle, 1, fd2, handle_import);
>
> /* destroy userptr object and expect SIGBUS */
> free_userptr_bo(fd1, handle);
> close(fd1);
>
> - if (mmo) {
> - struct sigaction sigact, orig_sigact;
> -
> - memset(&sigact, 0, sizeof(sigact));
> - sigact.sa_sigaction = sigbus;
> - sigact.sa_flags = SA_SIGINFO;
> - ret = sigaction(SIGBUS, &sigact, &orig_sigact);
> - igt_assert_eq(ret, 0);
> -
> - orig_sigbus = orig_sigact.sa_sigaction;
> -
> - sigbus_cnt = 0;
> - check_bo(fd2, handle_import, -1, fd2, handle_import,
> mmo);
> - igt_assert(sigbus_cnt > 0);
> -
> - ret = sigaction(SIGBUS, &orig_sigact, NULL);
> - igt_assert_eq(ret, 0);
> - }
> -
> close(fd2);
> reset_handle_ptr();
>
> @@ -1548,93 +1405,6 @@ static void test_readonly(int i915)
> munmap(pages, sz);
> }
>
> -static jmp_buf sigjmp;
> -
> -__noreturn static void sigjmp_handler(int sig)
> -{
> - siglongjmp(sigjmp, sig);
> -}
> -
> -static void test_readonly_mmap(int i915, const struct mmap_offset
> *t)
> -{
> - char *original, *result;
> - uint32_t handle;
> - uint32_t sz;
> - void *pages;
> - void *ptr;
> - int sig;
> -
> - /*
> - * A quick check to ensure that we cannot circumvent the
> - * read-only nature of our memory by creating a GTT mmap into
> - * the pages. Imagine receiving a readonly SHM segment from
> - * another process, or a readonly file mmap, it must remain
> readonly
> - * on the GPU as well.
> - */
> -
> - handle = gem_create(i915, PAGE_SIZE);
> - ptr = __gem_mmap_offset(i915, handle, 0, PAGE_SIZE,
> - PROT_READ | PROT_WRITE, t->type);
> - gem_close(i915, handle);
> - igt_require_f(ptr, "HW & kernel support for mmap-offset(%s)\n",
> - t->name);
> - munmap(ptr, PAGE_SIZE);
> -
> - igt_require(igt_setup_clflush());
> -
> - sz = 16 << 12;
> - pages = mmap(NULL, sz, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1,
> 0);
> - igt_assert(pages != MAP_FAILED);
> -
> - igt_require(__gem_userptr(i915, pages, sz, true, userptr_flags,
> &handle) == 0);
> - gem_set_caching(i915, handle, 0);
> -
> - memset(pages, 0xa5, sz);
> - igt_clflush_range(pages, sz);
> - original = g_compute_checksum_for_data(G_CHECKSUM_SHA1, pages,
> sz);
> -
> - ptr = __gem_mmap_offset(i915, handle, 0, sz, PROT_WRITE, t-
> >type);
> - igt_assert(ptr == NULL);
> -
> - /* Optional kernel support for GTT mmaps of userptr */
> - ptr = __gem_mmap_offset(i915, handle, 0, sz, PROT_READ, t-
> >type);
> - gem_close(i915, handle);
> -
> - if (ptr) { /* Check that a write into the GTT readonly map
> fails */
> - if (!(sig = sigsetjmp(sigjmp, 1))) {
> - signal(SIGBUS, sigjmp_handler);
> - signal(SIGSEGV, sigjmp_handler);
> - memset(ptr, 0x5a, sz);
> - igt_assert(0);
> - }
> - igt_assert_eq(sig, SIGSEGV);
> -
> - /* Check that we disallow removing the readonly
> protection */
> - igt_assert(mprotect(ptr, sz, PROT_WRITE));
> - if (!(sig = sigsetjmp(sigjmp, 1))) {
> - signal(SIGBUS, sigjmp_handler);
> - signal(SIGSEGV, sigjmp_handler);
> - memset(ptr, 0x5a, sz);
> - igt_assert(0);
> - }
> - igt_assert_eq(sig, SIGSEGV);
> -
> - /* A single read from the GTT pointer to prove that
> works */
> - igt_assert_eq_u32(*(uint8_t *)ptr, 0xa5);
> - munmap(ptr, sz);
> - }
> -
> - /* Double check that the kernel did indeed not let any writes
> through */
> - igt_clflush_range(pages, sz);
> - result = g_compute_checksum_for_data(G_CHECKSUM_SHA1, pages,
> sz);
> - igt_assert(!strcmp(original, result));
> -
> - g_free(original);
> - g_free(result);
> -
> - munmap(pages, sz);
> -}
> -
> static void test_readonly_pwrite(int i915)
> {
> char *original, *result;
> @@ -2423,12 +2193,6 @@ igt_main_args("c:", NULL, help_str,
> opt_handler, NULL)
> mmo_max = t->type + 1;
> igt_assert(mmo_max);
>
> - can_mmap = calloc(mmo_max, sizeof(*can_mmap));
> - igt_assert(can_mmap);
> -
> - for_each_mmap_offset_type(fd, t)
> - can_mmap[t->type] = has_mmap(fd, t) &&
> gem_has_llc(fd);
> -
> size = sizeof(linear);
>
> aperture_size = gem_aperture_size(fd);
> @@ -2520,12 +2284,6 @@ igt_main_args("c:", NULL, help_str,
> opt_handler, NULL)
> igt_subtest("readonly-unsync")
> test_readonly(fd);
>
> - igt_describe("Examine mmap-offset mapping to read-only
> userptr");
> - igt_subtest_with_dynamic("readonly-mmap-unsync")
> - for_each_mmap_offset_type(fd, t)
> - igt_dynamic(t->name)
> - test_readonly_mmap(fd, t);
> -
> igt_subtest("readonly-pwrite-unsync")
> test_readonly_pwrite(fd);
>
> @@ -2595,22 +2353,10 @@ igt_main_args("c:", NULL, help_str,
> opt_handler, NULL)
> }
>
> igt_subtest("process-exit")
> - test_process_exit(fd, NULL, 0);
> -
> - igt_describe("Test process exit with userptr object
> mmapped via mmap-offset");
> - igt_subtest_with_dynamic("process-exit-mmap")
> - for_each_mmap_offset_type(fd, t)
> - igt_dynamic(t->name)
> - test_process_exit(fd, t, 0);
> + test_process_exit(fd, 0);
>
> igt_subtest("process-exit-busy")
> - test_process_exit(fd, NULL, PE_BUSY);
> -
> - igt_describe("Test process exit with busy userptr
> object mmapped via mmap-offset");
> - igt_subtest_with_dynamic("process-exit-mmap-busy")
> - for_each_mmap_offset_type(fd, t)
> - igt_dynamic(t->name)
> - test_process_exit(fd, t,
> PE_BUSY);
> + test_process_exit(fd, PE_BUSY);
>
> igt_subtest("create-destroy-sync")
> test_create_destroy(fd, 5);
> @@ -2655,18 +2401,11 @@ igt_main_args("c:", NULL, help_str,
> opt_handler, NULL)
> }
> }
>
> - igt_describe("Invalidate pages of idle userptr with
> mmap-offset on top");
> - igt_subtest_with_dynamic("mmap-offset-invalidate-idle")
> + igt_describe("Verify mmap_offset to userptr is
> banned");
> + igt_subtest_with_dynamic("mmap-offset-banned")
> for_each_mmap_offset_type(fd, t)
> igt_dynamic_f("%s", t->name)
> - test_mmap_offset_invalidate(fd,
> t, 0);
> -
> - igt_describe("Invalidate pages of active userptr with
> mmap-offset on top");
> - igt_subtest_with_dynamic("mmap-offset-invalidate-
> active")
> - for_each_mmap_offset_type(fd, t)
> - igt_dynamic_f("%s", t->name)
> - test_mmap_offset_invalidate(fd,
> t,
> - MMOI
> _ACTIVE);
> + test_mmap_offset_banned(fd, t);
>
> igt_subtest("coherency-sync")
> test_coherency(fd, count);
> @@ -2748,7 +2487,4 @@ igt_main_args("c:", NULL, help_str,
> opt_handler, NULL)
>
> igt_subtest("access-control")
> test_access_control(fd);
> -
> - igt_fixture
> - free(can_mmap);
> }
LGTM,
Reviewed-by: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
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