--- /dev/null
+/*
+ * Copyright © 2017 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 <linux/completion.h>
+#include <linux/delay.h>
+
+#include "../i915_selftest.h"
+
+static int __i915_sw_fence_call
+fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
+{
+ switch (state) {
+ case FENCE_COMPLETE:
+ break;
+
+ case FENCE_FREE:
+ /* Leave the fence for the caller to free it after testing */
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct i915_sw_fence *alloc_fence(void)
+{
+ struct i915_sw_fence *fence;
+
+ fence = kmalloc(sizeof(*fence), GFP_KERNEL);
+ if (!fence)
+ return NULL;
+
+ i915_sw_fence_init(fence, fence_notify);
+ return fence;
+}
+
+static void free_fence(struct i915_sw_fence *fence)
+{
+ i915_sw_fence_fini(fence);
+ kfree(fence);
+}
+
+static int __test_self(struct i915_sw_fence *fence)
+{
+ if (i915_sw_fence_done(fence))
+ return -EINVAL;
+
+ i915_sw_fence_commit(fence);
+ if (!i915_sw_fence_done(fence))
+ return -EINVAL;
+
+ i915_sw_fence_wait(fence);
+ if (!i915_sw_fence_done(fence))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int test_self(void *arg)
+{
+ struct i915_sw_fence *fence;
+ int ret;
+
+ /* Test i915_sw_fence signaling and completion testing */
+ fence = alloc_fence();
+ if (!fence)
+ return -ENOMEM;
+
+ ret = __test_self(fence);
+
+ free_fence(fence);
+ return ret;
+}
+
+static int test_dag(void *arg)
+{
+ struct i915_sw_fence *A, *B, *C;
+ int ret = -EINVAL;
+
+ /* Test detection of cycles within the i915_sw_fence graphs */
+ if (!IS_ENABLED(CONFIG_DRM_I915_SW_FENCE_CHECK_DAG))
+ return 0;
+
+ A = alloc_fence();
+ if (!A)
+ return -ENOMEM;
+
+ if (i915_sw_fence_await_sw_fence_gfp(A, A, GFP_KERNEL) != -EINVAL) {
+ pr_err("recursive cycle not detected (AA)\n");
+ goto err_A;
+ }
+
+ B = alloc_fence();
+ if (!B) {
+ ret = -ENOMEM;
+ goto err_A;
+ }
+
+ i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
+ if (i915_sw_fence_await_sw_fence_gfp(B, A, GFP_KERNEL) != -EINVAL) {
+ pr_err("single depth cycle not detected (BAB)\n");
+ goto err_B;
+ }
+
+ C = alloc_fence();
+ if (i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL) == -EINVAL) {
+ pr_err("invalid cycle detected\n");
+ goto err_C;
+ }
+ if (i915_sw_fence_await_sw_fence_gfp(C, B, GFP_KERNEL) != -EINVAL) {
+ pr_err("single depth cycle not detected (CBC)\n");
+ goto err_C;
+ }
+ if (i915_sw_fence_await_sw_fence_gfp(C, A, GFP_KERNEL) != -EINVAL) {
+ pr_err("cycle not detected (BA, CB, AC)\n");
+ goto err_C;
+ }
+ if (i915_sw_fence_await_sw_fence_gfp(A, C, GFP_KERNEL) == -EINVAL) {
+ pr_err("invalid cycle detected\n");
+ goto err_C;
+ }
+
+ i915_sw_fence_commit(A);
+ i915_sw_fence_commit(B);
+ i915_sw_fence_commit(C);
+
+ ret = 0;
+ if (!i915_sw_fence_done(C)) {
+ pr_err("fence C not done\n");
+ ret = -EINVAL;
+ }
+ if (!i915_sw_fence_done(B)) {
+ pr_err("fence B not done\n");
+ ret = -EINVAL;
+ }
+ if (!i915_sw_fence_done(A)) {
+ pr_err("fence A not done\n");
+ ret = -EINVAL;
+ }
+err_C:
+ free_fence(C);
+err_B:
+ free_fence(B);
+err_A:
+ free_fence(A);
+ return ret;
+}
+
+static int test_AB(void *arg)
+{
+ struct i915_sw_fence *A, *B;
+ int ret;
+
+ /* Test i915_sw_fence (A) waiting on an event source (B) */
+ A = alloc_fence();
+ if (!A)
+ return -ENOMEM;
+ B = alloc_fence();
+ if (!B) {
+ ret = -ENOMEM;
+ goto err_A;
+ }
+
+ ret = i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
+ if (ret < 0)
+ goto err_B;
+ if (ret == 0) {
+ pr_err("Incorrectly reported fence A was complete before await\n");
+ ret = -EINVAL;
+ goto err_B;
+ }
+
+ ret = -EINVAL;
+ i915_sw_fence_commit(A);
+ if (i915_sw_fence_done(A))
+ goto err_B;
+
+ i915_sw_fence_commit(B);
+ if (!i915_sw_fence_done(B)) {
+ pr_err("Fence B is not done\n");
+ goto err_B;
+ }
+
+ if (!i915_sw_fence_done(A)) {
+ pr_err("Fence A is not done\n");
+ goto err_B;
+ }
+
+ ret = 0;
+err_B:
+ free_fence(B);
+err_A:
+ free_fence(A);
+ return ret;
+}
+
+static int test_ABC(void *arg)
+{
+ struct i915_sw_fence *A, *B, *C;
+ int ret;
+
+ /* Test a chain of fences, A waits on B who waits on C */
+ A = alloc_fence();
+ if (!A)
+ return -ENOMEM;
+
+ B = alloc_fence();
+ if (!B) {
+ ret = -ENOMEM;
+ goto err_A;
+ }
+
+ C = alloc_fence();
+ if (!C) {
+ ret = -ENOMEM;
+ goto err_B;
+ }
+
+ ret = i915_sw_fence_await_sw_fence_gfp(A, B, GFP_KERNEL);
+ if (ret < 0)
+ goto err_C;
+ if (ret == 0) {
+ pr_err("Incorrectly reported fence B was complete before await\n");
+ goto err_C;
+ }
+
+ ret = i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL);
+ if (ret < 0)
+ goto err_C;
+ if (ret == 0) {
+ pr_err("Incorrectly reported fence C was complete before await\n");
+ goto err_C;
+ }
+
+ ret = -EINVAL;
+ i915_sw_fence_commit(A);
+ if (i915_sw_fence_done(A)) {
+ pr_err("Fence A completed early\n");
+ goto err_C;
+ }
+
+ i915_sw_fence_commit(B);
+ if (i915_sw_fence_done(B)) {
+ pr_err("Fence B completed early\n");
+ goto err_C;
+ }
+
+ if (i915_sw_fence_done(A)) {
+ pr_err("Fence A completed early (after signaling B)\n");
+ goto err_C;
+ }
+
+ i915_sw_fence_commit(C);
+
+ ret = 0;
+ if (!i915_sw_fence_done(C)) {
+ pr_err("Fence C not done\n");
+ ret = -EINVAL;
+ }
+ if (!i915_sw_fence_done(B)) {
+ pr_err("Fence B not done\n");
+ ret = -EINVAL;
+ }
+ if (!i915_sw_fence_done(A)) {
+ pr_err("Fence A not done\n");
+ ret = -EINVAL;
+ }
+err_C:
+ free_fence(C);
+err_B:
+ free_fence(B);
+err_A:
+ free_fence(A);
+ return ret;
+}
+
+static int test_AB_C(void *arg)
+{
+ struct i915_sw_fence *A, *B, *C;
+ int ret = -EINVAL;
+
+ /* Test multiple fences (AB) waiting on a single event (C) */
+ A = alloc_fence();
+ if (!A)
+ return -ENOMEM;
+
+ B = alloc_fence();
+ if (!B) {
+ ret = -ENOMEM;
+ goto err_A;
+ }
+
+ C = alloc_fence();
+ if (!B) {
+ ret = -ENOMEM;
+ goto err_B;
+ }
+
+ ret = i915_sw_fence_await_sw_fence_gfp(A, C, GFP_KERNEL);
+ if (ret < 0)
+ goto err_C;
+ if (ret == 0) {
+ ret = -EINVAL;
+ goto err_C;
+ }
+
+ ret = i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL);
+ if (ret < 0)
+ goto err_C;
+ if (ret == 0) {
+ ret = -EINVAL;
+ goto err_C;
+ }
+
+ i915_sw_fence_commit(A);
+ i915_sw_fence_commit(B);
+
+ ret = 0;
+ if (i915_sw_fence_done(A)) {
+ pr_err("Fence A completed early\n");
+ ret = -EINVAL;
+ }
+
+ if (i915_sw_fence_done(B)) {
+ pr_err("Fence B completed early\n");
+ ret = -EINVAL;
+ }
+
+ i915_sw_fence_commit(C);
+ if (!i915_sw_fence_done(C)) {
+ pr_err("Fence C not done\n");
+ ret = -EINVAL;
+ }
+
+ if (!i915_sw_fence_done(B)) {
+ pr_err("Fence B not done\n");
+ ret = -EINVAL;
+ }
+
+ if (!i915_sw_fence_done(A)) {
+ pr_err("Fence A not done\n");
+ ret = -EINVAL;
+ }
+
+err_C:
+ free_fence(C);
+err_B:
+ free_fence(B);
+err_A:
+ free_fence(A);
+ return ret;
+}
+
+static int test_C_AB(void *arg)
+{
+ struct i915_sw_fence *A, *B, *C;
+ int ret;
+
+ /* Test multiple event sources (A,B) for a single fence (C) */
+ A = alloc_fence();
+ if (!A)
+ return -ENOMEM;
+
+ B = alloc_fence();
+ if (!B) {
+ ret = -ENOMEM;
+ goto err_A;
+ }
+
+ C = alloc_fence();
+ if (!B) {
+ ret = -ENOMEM;
+ goto err_B;
+ }
+
+ ret = i915_sw_fence_await_sw_fence_gfp(C, A, GFP_KERNEL);
+ if (ret < 0)
+ goto err_C;
+ if (ret == 0) {
+ ret = -EINVAL;
+ goto err_C;
+ }
+
+ ret = i915_sw_fence_await_sw_fence_gfp(C, B, GFP_KERNEL);
+ if (ret < 0)
+ goto err_C;
+ if (ret == 0) {
+ ret = -EINVAL;
+ goto err_C;
+ }
+
+ ret = 0;
+ i915_sw_fence_commit(C);
+ if (i915_sw_fence_done(C))
+ ret = -EINVAL;
+
+ i915_sw_fence_commit(A);
+ i915_sw_fence_commit(B);
+
+ if (!i915_sw_fence_done(A)) {
+ pr_err("Fence A not done\n");
+ ret = -EINVAL;
+ }
+
+ if (!i915_sw_fence_done(B)) {
+ pr_err("Fence B not done\n");
+ ret = -EINVAL;
+ }
+
+ if (!i915_sw_fence_done(C)) {
+ pr_err("Fence C not done\n");
+ ret = -EINVAL;
+ }
+
+err_C:
+ free_fence(C);
+err_B:
+ free_fence(B);
+err_A:
+ free_fence(A);
+ return ret;
+}
+
+static int test_chain(void *arg)
+{
+ int nfences = 4096;
+ struct i915_sw_fence **fences;
+ int ret, i;
+
+ /* Test a long chain of fences */
+ fences = kmalloc_array(nfences, sizeof(*fences), GFP_KERNEL);
+ if (!fences)
+ return -ENOMEM;
+
+ for (i = 0; i < nfences; i++) {
+ fences[i] = alloc_fence();
+ if (!fences[i]) {
+ nfences = i;
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ if (i > 0) {
+ ret = i915_sw_fence_await_sw_fence_gfp(fences[i],
+ fences[i - 1],
+ GFP_KERNEL);
+ if (ret < 0) {
+ nfences = i + 1;
+ goto err;
+ }
+
+ i915_sw_fence_commit(fences[i]);
+ }
+ }
+
+ ret = 0;
+ for (i = nfences; --i; ) {
+ if (i915_sw_fence_done(fences[i])) {
+ if (ret == 0)
+ pr_err("Fence[%d] completed early\n", i);
+ ret = -EINVAL;
+ }
+ }
+ i915_sw_fence_commit(fences[0]);
+ for (i = 0; ret == 0 && i < nfences; i++) {
+ if (!i915_sw_fence_done(fences[i])) {
+ pr_err("Fence[%d] is not done\n", i);
+ ret = -EINVAL;
+ }
+ }
+
+err:
+ for (i = 0; i < nfences; i++)
+ free_fence(fences[i]);
+ kfree(fences);
+ return ret;
+}
+
+struct task_ipc {
+ struct work_struct work;
+ struct completion started;
+ struct i915_sw_fence *in, *out;
+ int value;
+};
+
+static void task_ipc(struct work_struct *work)
+{
+ struct task_ipc *ipc = container_of(work, typeof(*ipc), work);
+
+ complete(&ipc->started);
+
+ i915_sw_fence_wait(ipc->in);
+ smp_store_mb(ipc->value, 1);
+ i915_sw_fence_commit(ipc->out);
+}
+
+static int test_ipc(void *arg)
+{
+ struct task_ipc ipc;
+ int ret = 0;
+
+ /* Test use of i915_sw_fence as an interprocess signaling mechanism */
+ ipc.in = alloc_fence();
+ if (!ipc.in)
+ return -ENOMEM;
+ ipc.out = alloc_fence();
+ if (!ipc.out) {
+ ret = -ENOMEM;
+ goto err_in;
+ }
+
+ /* use a completion to avoid chicken-and-egg testing */
+ init_completion(&ipc.started);
+
+ ipc.value = 0;
+ INIT_WORK_ONSTACK(&ipc.work, task_ipc);
+ schedule_work(&ipc.work);
+
+ wait_for_completion(&ipc.started);
+
+ usleep_range(1000, 2000);
+ if (READ_ONCE(ipc.value)) {
+ pr_err("worker updated value before i915_sw_fence was signaled\n");
+ ret = -EINVAL;
+ }
+
+ i915_sw_fence_commit(ipc.in);
+ i915_sw_fence_wait(ipc.out);
+
+ if (!READ_ONCE(ipc.value)) {
+ pr_err("worker signaled i915_sw_fence before value was posted\n");
+ ret = -EINVAL;
+ }
+
+ flush_work(&ipc.work);
+ destroy_work_on_stack(&ipc.work);
+ free_fence(ipc.out);
+err_in:
+ free_fence(ipc.in);
+ return ret;
+}
+
+int i915_sw_fence_mock_selftests(void)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(test_self),
+ SUBTEST(test_dag),
+ SUBTEST(test_AB),
+ SUBTEST(test_ABC),
+ SUBTEST(test_AB_C),
+ SUBTEST(test_C_AB),
+ SUBTEST(test_chain),
+ SUBTEST(test_ipc),
+ };
+
+ return i915_subtests(tests, NULL);
+}
projects / karo-tx-linux.git / commitdiff