Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> A long time ago, I wrote some selftests for the struct kfence idea. Now
> that we have infrastructure in i915/igt for running kselftests, include
> some for i915_sw_fence.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Only minor thing that caught my eye was that I would
have preferred:
err_free_C: type of gotos instead of just err_C. In here
tho everything was straightfoward teardown of allocations
so it was clear.
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/Kconfig.debug | 12 +
> drivers/gpu/drm/i915/i915_sw_fence.c | 7 +-
> .../gpu/drm/i915/selftests/i915_mock_selftests.h | 1 +
> drivers/gpu/drm/i915/selftests/i915_sw_fence.c | 576 +++++++++++++++++++++
> 4 files changed, 595 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/i915/selftests/i915_sw_fence.c
>
> diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
> index b00edd3b8800..78c5c049a347 100644
> --- a/drivers/gpu/drm/i915/Kconfig.debug
> +++ b/drivers/gpu/drm/i915/Kconfig.debug
> @@ -61,6 +61,18 @@ config DRM_I915_SW_FENCE_DEBUG_OBJECTS
>
> If in doubt, say "N".
>
> +config DRM_I915_SW_FENCE_CHECK_DAG
> + bool "Enable additional driver debugging for detecting dependency cycles"
> + depends on DRM_I915
> + default n
> + help
> + Choose this option to turn on extra driver debugging that may affect
> + performance but will catch some internal issues.
> +
> + Recommended for driver developers only.
> +
> + If in doubt, say "N".
> +
> config DRM_I915_SELFTEST
> bool "Enable selftests upon driver load"
> depends on DRM_I915
> diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
> index a0a690d6627e..474d23c0c0ce 100644
> --- a/drivers/gpu/drm/i915/i915_sw_fence.c
> +++ b/drivers/gpu/drm/i915/i915_sw_fence.c
> @@ -12,6 +12,7 @@
> #include <linux/reservation.h>
>
> #include "i915_sw_fence.h"
> +#include "i915_selftest.h"
>
> #define I915_SW_FENCE_FLAG_ALLOC BIT(3) /* after WQ_FLAG_* for safety */
>
> @@ -274,7 +275,7 @@ static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
> unsigned long flags;
> bool err;
>
> - if (!IS_ENABLED(CONFIG_I915_SW_FENCE_CHECK_DAG))
> + if (!IS_ENABLED(CONFIG_DRM_I915_SW_FENCE_CHECK_DAG))
> return false;
>
> spin_lock_irqsave(&i915_sw_fence_lock, flags);
> @@ -490,3 +491,7 @@ int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
>
> return ret;
> }
> +
> +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
> +#include "selftests/i915_sw_fence.c"
> +#endif
> diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
> index 76c1f149a0a0..fc74687501ba 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
> +++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
> @@ -9,6 +9,7 @@
> * Tests are executed in order by igt/drv_selftest
> */
> selftest(sanitycheck, i915_mock_sanitycheck) /* keep first (igt selfcheck) */
> +selftest(fence, i915_sw_fence_mock_selftests)
> selftest(scatterlist, scatterlist_mock_selftests)
> selftest(syncmap, i915_syncmap_mock_selftests)
> selftest(uncore, intel_uncore_mock_selftests)
> diff --git a/drivers/gpu/drm/i915/selftests/i915_sw_fence.c b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
> new file mode 100644
> index 000000000000..c552c23eecff
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
> @@ -0,0 +1,576 @@
> +/*
> + * 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(&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);
> + 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);
> +}
> --
> 2.11.0
>
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