[Intel-gfx] [PATCH i-g-t 2/2] tests/i915/gem_mmap_offset: Add new API test for gem_mmap_offset
Chris Wilson
chris at chris-wilson.co.uk
Wed Dec 4 16:28:35 UTC 2019
From: Lukasz Kalamarz <lukasz.kalamarz at intel.com>
Few simple tests which tries to create / mmap buffer objects
using GEM_MMAP_OFFSET uAPI.
v2: change from WC -> WB (according to Chris review comment)
v3: add mmap-offset-close-race test
Signed-off-by: Lukasz Kalamarz <lukasz.kalamarz at intel.com>
Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Vanshidhar Konda <vanshidhar.r.konda at intel.com>
---
Required (look to gem_mmap_(gtt,wc,cpu) for ideas):
size - check we can handle objects beyond a reasonable limit (note the
kernel fails at beyond RAM)
forked - interactions with pagefault + new mmap_offsets across
threads/processes
suspend - check speed is consistent before/after suspend
coherency - combinatorial checker between all pointer types, prw and gpu
---
tests/Makefile.sources | 3 +
tests/i915/gem_mmap_offset.c | 483 +++++++++++++++++++++++++++++++++++
tests/meson.build | 1 +
3 files changed, 487 insertions(+)
create mode 100644 tests/i915/gem_mmap_offset.c
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 17980ed60..0de908de2 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -318,6 +318,9 @@ gem_mmap_SOURCES = i915/gem_mmap.c
TESTS_progs += gem_mmap_gtt
gem_mmap_gtt_SOURCES = i915/gem_mmap_gtt.c
+TESTS_progs += gem_mmap_offset
+gem_mmap_offset_SOURCES = i915/gem_mmap_offset.c
+
TESTS_progs += gem_mmap_offset_exhaustion
gem_mmap_offset_exhaustion_SOURCES = i915/gem_mmap_offset_exhaustion.c
diff --git a/tests/i915/gem_mmap_offset.c b/tests/i915/gem_mmap_offset.c
new file mode 100644
index 000000000..7c4088cdf
--- /dev/null
+++ b/tests/i915/gem_mmap_offset.c
@@ -0,0 +1,483 @@
+/*
+ * Copyright © 2019 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdatomic.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include "drm.h"
+
+#include "igt.h"
+#include "igt_x86.h"
+
+IGT_TEST_DESCRIPTION("Basic MMAP_OFFSET IOCTL tests for mem regions\n");
+
+static const struct mmap_offset {
+ const char *name;
+ unsigned int type;
+ unsigned int domain;
+} mmap_offset_types[] = {
+ { "gtt", I915_MMAP_OFFSET_GTT, I915_GEM_DOMAIN_GTT },
+ { "wb", I915_MMAP_OFFSET_WB, I915_GEM_DOMAIN_CPU },
+ { "wc", I915_MMAP_OFFSET_WC, I915_GEM_DOMAIN_WC },
+ { "uc", I915_MMAP_OFFSET_UC, I915_GEM_DOMAIN_WC },
+ {},
+};
+
+#define for_each_mmap_offset_type(__t) \
+ for (const struct mmap_offset *__t = mmap_offset_types; \
+ (__t)->name; \
+ (__t)++)
+
+static int mmap_offset_ioctl(int i915, struct drm_i915_gem_mmap_offset *arg)
+{
+ int err = 0;
+
+ if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_MMAP_OFFSET, arg)) {
+ err = -errno;
+ igt_assume(err);
+ }
+
+ errno = 0;
+ return err;
+}
+
+static void *
+__mmap_offset(int i915, uint32_t handle, uint64_t offset, uint64_t size,
+ unsigned int prot, uint64_t flags)
+{
+ struct drm_i915_gem_mmap_offset arg = {
+ .handle = handle,
+ .flags = flags,
+ };
+ void *ptr;
+
+ if (mmap_offset_ioctl(i915, &arg))
+ return NULL;
+
+ ptr = mmap64(0, size, prot, MAP_SHARED, i915, arg.offset + offset);
+ if (ptr == MAP_FAILED)
+ ptr = NULL;
+ else
+ errno = 0;
+
+ return ptr;
+}
+
+static void bad_object(int i915)
+{
+ uint32_t real_handle;
+ uint32_t handles[20];
+ int i = 0;
+
+ real_handle = gem_create(i915, 4096);
+
+ handles[i++] = 0xdeadbeef;
+ for (int bit = 0; bit < 16; bit++)
+ handles[i++] = real_handle | (1 << (bit + 16));
+ handles[i] = real_handle + 1;
+
+ for (; i >= 0; i--) {
+ struct drm_i915_gem_mmap_offset arg = {
+ .handle = handles[i],
+ .flags = I915_MMAP_OFFSET_WB,
+ };
+
+ igt_debug("Trying MMAP IOCTL with handle %x\n",
+ handles[i]);
+ igt_assert_eq(mmap_offset_ioctl(i915, &arg),
+ -ENOENT);
+ }
+
+ gem_close(i915, real_handle);
+}
+
+static void bad_flags(int i915)
+{
+ struct drm_i915_gem_mmap_offset arg = {
+ .handle = gem_create(i915, 4096),
+ .flags = -1ull,
+ };
+
+ igt_assert_eq(mmap_offset_ioctl(i915, &arg), -EINVAL);
+ gem_close(i915, arg.handle);
+}
+
+static void bad_extensions(int i915)
+{
+ struct i915_user_extension ext;
+ struct drm_i915_gem_mmap_offset arg = {
+ .handle = gem_create(i915, 4096),
+ .extensions = -1ull,
+ };
+
+ igt_assert_eq(mmap_offset_ioctl(i915, &arg), -EFAULT);
+ arg.extensions = to_user_pointer(&ext);
+
+ ext.name = -1;
+ igt_assert_eq(mmap_offset_ioctl(i915, &arg), -EINVAL);
+
+ gem_close(i915, arg.handle);
+}
+
+static void basic_uaf(int i915)
+{
+ const uint32_t obj_size = 4096;
+
+ for_each_mmap_offset_type(t) {
+ uint32_t handle = gem_create(i915, obj_size);
+ uint8_t *expected, *buf, *addr;
+
+ addr = __mmap_offset(i915, handle, 0, obj_size,
+ PROT_READ | PROT_WRITE,
+ t->type);
+ if (!addr) {
+ gem_close(i915, handle);
+ continue;
+ }
+
+ expected = calloc(obj_size, sizeof(*expected));
+ gem_set_domain(i915, handle, t->domain, 0);
+ igt_assert_f(memcmp(addr, expected, obj_size) == 0,
+ "mmap(%s) not clear on gem_create()\n",
+ t->name);
+ free(expected);
+
+ buf = calloc(obj_size, sizeof(*buf));
+ memset(buf + 1024, 0x01, 1024);
+ gem_write(i915, handle, 0, buf, obj_size);
+ gem_set_domain(i915, handle, t->domain, 0);
+ igt_assert_f(memcmp(buf, addr, obj_size) == 0,
+ "mmap(%s) not coherent with gem_write()\n",
+ t->name);
+
+ gem_set_domain(i915, handle, t->domain, t->domain);
+ memset(addr + 2048, 0xff, 1024);
+ gem_read(i915, handle, 0, buf, obj_size);
+ gem_set_domain(i915, handle, t->domain, 0);
+ igt_assert_f(memcmp(buf, addr, obj_size) == 0,
+ "mmap(%s) not coherent with gem_read()\n",
+ t->name);
+
+ gem_close(i915, handle);
+ igt_assert_f(memcmp(buf, addr, obj_size) == 0,
+ "mmap(%s) not resident after gem_close()\n",
+ t->name);
+ free(buf);
+
+ igt_debug("Testing unmapping\n");
+ munmap(addr, obj_size);
+ }
+}
+
+static void isolation(int i915)
+{
+ for_each_mmap_offset_type(t) {
+ struct drm_i915_gem_mmap_offset mmap_arg = {
+ .flags = t->type
+ };
+ int A = gem_reopen_driver(i915);
+ int B = gem_reopen_driver(i915);
+ uint64_t offset_a, offset_b;
+ uint32_t a, b;
+ void *ptr;
+
+ a = gem_create(A, 4096);
+ b = gem_open(B, gem_flink(A, a));
+
+ mmap_arg.handle = a;
+ if (mmap_offset_ioctl(i915, &mmap_arg)) {
+ close(A);
+ close(B);
+ continue;
+ }
+ offset_a = mmap_arg.offset;
+
+ mmap_arg.handle = b;
+ igt_assert_eq(mmap_offset_ioctl(i915, &mmap_arg), 0);
+ offset_b = mmap_arg.offset;
+
+ igt_info("A[%s]: {fd:%d, handle:%d, offset:%"PRIx64"}\n",
+ t->name, A, a, offset_a);
+ igt_info("B[%s]: {fd:%d, handle:%d, offset:%"PRIx64"}\n",
+ t->name, B, b, offset_b);
+
+ ptr = mmap64(0, 4096, PROT_READ, MAP_SHARED, B, offset_a);
+ igt_assert(ptr == MAP_FAILED);
+
+ ptr = mmap64(0, 4096, PROT_READ, MAP_SHARED, A, offset_b);
+ igt_assert(ptr == MAP_FAILED);
+
+ close(B);
+
+ ptr = mmap64(0, 4096, PROT_READ, MAP_SHARED, A, offset_a);
+ igt_assert(ptr != MAP_FAILED);
+ munmap(ptr, 4096);
+
+ close(A);
+
+ ptr = mmap64(0, 4096, PROT_READ, MAP_SHARED, A, offset_a);
+ igt_assert(ptr == MAP_FAILED);
+ }
+}
+
+static void pf_nonblock(int i915)
+{
+ igt_spin_t *spin = igt_spin_new(i915);
+
+ for_each_mmap_offset_type(t) {
+ uint32_t *ptr;
+
+ ptr = __mmap_offset(i915, spin->handle, 0, 4096,
+ PROT_READ | PROT_WRITE,
+ t->type);
+ if (!ptr)
+ continue;
+
+ igt_set_timeout(1, t->name);
+ /* no set-domain as we want to verify the pagefault is async */
+ ptr[256] = 0;
+ igt_reset_timeout();
+
+ munmap(ptr, 4096);
+ }
+
+ igt_spin_free(i915, spin);
+}
+
+static void close_race(int i915, int timeout)
+{
+ const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+ _Atomic uint32_t *handles;
+ size_t len = ALIGN((ncpus + 1) * sizeof(uint32_t), 4096);
+
+ handles = mmap64(0, len, PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);
+ igt_assert(handles != MAP_FAILED);
+
+ igt_fork(child, ncpus + 1) {
+ do {
+ struct drm_i915_gem_mmap_offset mmap_arg = {};
+ const int i = 1 + random() % ncpus;
+ uint32_t old;
+
+ mmap_arg.handle = gem_create(i915, 4096);
+ mmap_arg.flags = I915_MMAP_OFFSET_WB;
+ old = atomic_exchange(&handles[i], mmap_arg.handle);
+ ioctl(i915, DRM_IOCTL_GEM_CLOSE, &old);
+
+ if (ioctl(i915,
+ DRM_IOCTL_I915_GEM_MMAP_OFFSET,
+ &mmap_arg) != -1) {
+ void *ptr;
+
+ ptr = mmap64(0, 4096,
+ PROT_WRITE, MAP_SHARED, i915,
+ mmap_arg.offset);
+ if (ptr != MAP_FAILED) {
+ *(volatile uint32_t *)ptr = 0;
+ munmap(ptr, 4096);
+ }
+ }
+
+ } while (!READ_ONCE(handles[0]));
+ }
+
+ sleep(timeout);
+ handles[0] = 1;
+ igt_waitchildren();
+
+ for (int i = 1; i <= ncpus; i++)
+ ioctl(i915, DRM_IOCTL_GEM_CLOSE, handles[i]);
+ munmap(handles, len);
+}
+
+static uint64_t atomic_compare_swap_u64(_Atomic(uint64_t) *ptr,
+ uint64_t oldval, uint64_t newval)
+{
+ atomic_compare_exchange_strong(ptr, &oldval, newval);
+ return oldval;
+}
+
+static uint64_t get_npages(_Atomic(uint64_t) *global, uint64_t npages)
+{
+ uint64_t try, old, max;
+
+ max = *global;
+ do {
+ old = max;
+ try = 1 + npages % (max / 2);
+ max -= try;
+ } while ((max = atomic_compare_swap_u64(global, old, max)) != old);
+
+ return try;
+}
+
+struct thread_clear {
+ _Atomic(uint64_t) max;
+ int timeout;
+ int i915;
+};
+
+static int create_ioctl(int i915, struct drm_i915_gem_create *create)
+{
+ int err = 0;
+
+ if (igt_ioctl(i915, DRM_IOCTL_I915_GEM_CREATE, create)) {
+ err = -errno;
+ igt_assume(err != 0);
+ }
+
+ errno = 0;
+ return err;
+}
+
+static void *thread_clear(void *data)
+{
+ struct thread_clear *arg = data;
+ const struct mmap_offset *t;
+ unsigned long checked = 0;
+ int i915 = arg->i915;
+
+ t = mmap_offset_types;
+ igt_until_timeout(arg->timeout) {
+ struct drm_i915_gem_create create = {};
+ uint64_t npages;
+ void *ptr;
+
+ npages = random();
+ npages <<= 32;
+ npages |= random();
+ npages = get_npages(&arg->max, npages);
+ create.size = npages << 12;
+
+ create_ioctl(i915, &create);
+ ptr = __mmap_offset(i915, create.handle, 0, create.size,
+ PROT_READ | PROT_WRITE,
+ t->type);
+ /* No set-domains as we are being as naughty as possible */
+ for (uint64_t page = 0; ptr && page < npages; page++) {
+ uint64_t x[8] = {
+ page * 4096 +
+ sizeof(x) * ((page % (4096 - sizeof(x)) / sizeof(x)))
+ };
+
+ if (page & 1)
+ igt_memcpy_from_wc(x, ptr + x[0], sizeof(x));
+ else
+ memcpy(x, ptr + x[0], sizeof(x));
+
+ for (int i = 0; i < ARRAY_SIZE(x); i++)
+ igt_assert_eq_u64(x[i], 0);
+ }
+ if (ptr)
+ munmap(ptr, create.size);
+ gem_close(i915, create.handle);
+ checked += npages;
+
+ atomic_fetch_add(&arg->max, npages);
+
+ if (!(++t)->name)
+ t = mmap_offset_types;
+ }
+
+ return (void *)(uintptr_t)checked;
+}
+
+static void always_clear(int i915, int timeout)
+{
+ struct thread_clear arg = {
+ .i915 = i915,
+ .timeout = timeout,
+ .max = intel_get_avail_ram_mb() << (20 - 12), /* in pages */
+ };
+ const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+ unsigned long checked;
+ pthread_t thread[ncpus];
+ void *result;
+
+ for (int i = 0; i < ncpus; i++)
+ pthread_create(&thread[i], NULL, thread_clear, &arg);
+
+ checked = 0;
+ for (int i = 0; i < ncpus; i++) {
+ pthread_join(thread[i], &result);
+ checked += (uintptr_t)result;
+ }
+ igt_info("Checked %'lu page allocations\n", checked);
+}
+
+static int mmap_gtt_version(int i915)
+{
+ int gtt_version = -1;
+ struct drm_i915_getparam gp = {
+ .param = I915_PARAM_MMAP_GTT_VERSION,
+ .value = >t_version,
+ };
+ ioctl(i915, DRM_IOCTL_I915_GETPARAM, &gp);
+
+ return gtt_version;
+}
+
+static bool has_mmap_offset(int i915)
+{
+ return mmap_gtt_version(i915) >= 4;
+}
+
+igt_main
+{
+ int i915;
+
+ igt_fixture {
+ i915 = drm_open_driver(DRIVER_INTEL);
+ igt_require(has_mmap_offset(i915));
+ }
+
+ igt_describe("Verify mapping to invalid gem objects won't be created");
+ igt_subtest_f("bad-object")
+ bad_object(i915);
+ igt_subtest_f("bad-flags")
+ bad_flags(i915);
+ igt_subtest_f("bad-extensions")
+ bad_extensions(i915);
+
+ igt_describe("Check buffer object mapping persists after gem_close");
+ igt_subtest_f("basic-uaf")
+ basic_uaf(i915);
+
+ igt_subtest_f("isolation")
+ isolation(i915);
+ igt_subtest_f("pf-nonblock")
+ pf_nonblock(i915);
+
+ igt_describe("Check race between close and mmap offset between threads");
+ igt_subtest_f("close-race")
+ close_race(i915, 20);
+
+ igt_subtest_f("clear")
+ always_clear(i915, 20);
+
+ igt_fixture {
+ close(i915);
+ }
+}
diff --git a/tests/meson.build b/tests/meson.build
index 0b15609c2..7c8a988f6 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -172,6 +172,7 @@ i915_progs = [
'gem_media_vme',
'gem_mmap',
'gem_mmap_gtt',
+ 'gem_mmap_offset',
'gem_mmap_offset_exhaustion',
'gem_mmap_wc',
'gem_partial_pwrite_pread',
--
2.24.0
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