On Sat, 09 Mar 2019, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> In the next patch, we will want to update live state within a context.
> As this state may be in use by the GPU and we haven't been explicitly
> tracking its activity, we instead attach it to a request we send down
> the context setup with its new state and on retiring that request
> cleanup the old state as we then know that it is no longer live.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
This, or more precisely commit 85fddf0b0027 ("drm/i915: Introduce a
context barrier callback"), breaks build for
CONFIG_DRM_I915_WERROR=y
CONFIG_DRM_I915_SELFTEST=n
with
CC [M] drivers/gpu/drm/i915/i915_gem_context.o
drivers/gpu/drm/i915/i915_gem_context.c:698:12: error: ‘context_barrier_task’ defined but not used [-Werror=unused-function]
static int context_barrier_task(struct i915_gem_context *ctx,
^~~~~~~~~~~~~~~~~~~~
Please fix.
BR,
Jani.
> ---
> drivers/gpu/drm/i915/i915_gem_context.c | 74 ++++++++++++
> .../gpu/drm/i915/selftests/i915_gem_context.c | 106 ++++++++++++++++++
> 2 files changed, 180 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index f9a21a891aa4..b6370225dcb5 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -677,6 +677,80 @@ last_request_on_engine(struct i915_timeline *timeline,
> return NULL;
> }
>
> +struct context_barrier_task {
> + struct i915_active base;
> + void (*task)(void *data);
> + void *data;
> +};
> +
> +static void cb_retire(struct i915_active *base)
> +{
> + struct context_barrier_task *cb = container_of(base, typeof(*cb), base);
> +
> + if (cb->task)
> + cb->task(cb->data);
> +
> + i915_active_fini(&cb->base);
> + kfree(cb);
> +}
> +
> +I915_SELFTEST_DECLARE(static unsigned long context_barrier_inject_fault);
> +static int context_barrier_task(struct i915_gem_context *ctx,
> + unsigned long engines,
> + void (*task)(void *data),
> + void *data)
> +{
> + struct drm_i915_private *i915 = ctx->i915;
> + struct context_barrier_task *cb;
> + struct intel_context *ce;
> + intel_wakeref_t wakeref;
> + int err = 0;
> +
> + lockdep_assert_held(&i915->drm.struct_mutex);
> + GEM_BUG_ON(!task);
> +
> + cb = kmalloc(sizeof(*cb), GFP_KERNEL);
> + if (!cb)
> + return -ENOMEM;
> +
> + i915_active_init(i915, &cb->base, cb_retire);
> + i915_active_acquire(&cb->base);
> +
> + wakeref = intel_runtime_pm_get(i915);
> + list_for_each_entry(ce, &ctx->active_engines, active_link) {
> + struct intel_engine_cs *engine = ce->engine;
> + struct i915_request *rq;
> +
> + if (!(ce->engine->mask & engines))
> + continue;
> +
> + if (I915_SELFTEST_ONLY(context_barrier_inject_fault &
> + engine->mask)) {
> + err = -ENXIO;
> + break;
> + }
> +
> + rq = i915_request_alloc(engine, ctx);
> + if (IS_ERR(rq)) {
> + err = PTR_ERR(rq);
> + break;
> + }
> +
> + err = i915_active_ref(&cb->base, rq->fence.context, rq);
> + i915_request_add(rq);
> + if (err)
> + break;
> + }
> + intel_runtime_pm_put(i915, wakeref);
> +
> + cb->task = err ? NULL : task; /* caller needs to unwind instead */
> + cb->data = data;
> +
> + i915_active_release(&cb->base);
> +
> + return err;
> +}
> +
> int i915_gem_switch_to_kernel_context(struct drm_i915_private *i915,
> unsigned long mask)
> {
> diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
> index 5b8614b2fbe4..4399ef9ebf15 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
> @@ -1594,10 +1594,116 @@ static int igt_switch_to_kernel_context(void *arg)
> return err;
> }
>
> +static void mock_barrier_task(void *data)
> +{
> + unsigned int *counter = data;
> +
> + ++*counter;
> +}
> +
> +static int mock_context_barrier(void *arg)
> +{
> +#undef pr_fmt
> +#define pr_fmt(x) "context_barrier_task():" # x
> + struct drm_i915_private *i915 = arg;
> + struct i915_gem_context *ctx;
> + struct i915_request *rq;
> + intel_wakeref_t wakeref;
> + unsigned int counter;
> + int err;
> +
> + /*
> + * The context barrier provides us with a callback after it emits
> + * a request; useful for retiring old state after loading new.
> + */
> +
> + mutex_lock(&i915->drm.struct_mutex);
> +
> + ctx = mock_context(i915, "mock");
> + if (IS_ERR(ctx)) {
> + err = PTR_ERR(ctx);
> + goto unlock;
> + }
> +
> + counter = 0;
> + err = context_barrier_task(ctx, 0, mock_barrier_task, &counter);
> + if (err) {
> + pr_err("Failed at line %d, err=%d\n", __LINE__, err);
> + goto out;
> + }
> + if (counter == 0) {
> + pr_err("Did not retire immediately with 0 engines\n");
> + err = -EINVAL;
> + goto out;
> + }
> +
> + counter = 0;
> + err = context_barrier_task(ctx,
> + ALL_ENGINES, mock_barrier_task, &counter);
> + if (err) {
> + pr_err("Failed at line %d, err=%d\n", __LINE__, err);
> + goto out;
> + }
> + if (counter == 0) {
> + pr_err("Did not retire immediately for all inactive engines\n");
> + err = -EINVAL;
> + goto out;
> + }
> +
> + rq = ERR_PTR(-ENODEV);
> + with_intel_runtime_pm(i915, wakeref)
> + rq = i915_request_alloc(i915->engine[RCS0], ctx);
> + if (IS_ERR(rq)) {
> + pr_err("Request allocation failed!\n");
> + goto out;
> + }
> + i915_request_add(rq);
> + GEM_BUG_ON(list_empty(&ctx->active_engines));
> +
> + counter = 0;
> + context_barrier_inject_fault = BIT(RCS0);
> + err = context_barrier_task(ctx,
> + ALL_ENGINES, mock_barrier_task, &counter);
> + context_barrier_inject_fault = 0;
> + if (err == -ENXIO)
> + err = 0;
> + else
> + pr_err("Did not hit fault injection!\n");
> + if (counter != 0) {
> + pr_err("Invoked callback on error!\n");
> + err = -EIO;
> + }
> + if (err)
> + goto out;
> +
> + counter = 0;
> + err = context_barrier_task(ctx,
> + ALL_ENGINES, mock_barrier_task, &counter);
> + if (err) {
> + pr_err("Failed at line %d, err=%d\n", __LINE__, err);
> + goto out;
> + }
> + mock_device_flush(i915);
> + if (counter == 0) {
> + pr_err("Did not retire on each active engines\n");
> + err = -EINVAL;
> + goto out;
> + }
> +
> +out:
> + mock_context_close(ctx);
> +unlock:
> + mutex_unlock(&i915->drm.struct_mutex);
> + return err;
> +#undef pr_fmt
> +#define pr_fmt(x) x
> +}
> +
> int i915_gem_context_mock_selftests(void)
> {
> static const struct i915_subtest tests[] = {
> SUBTEST(igt_switch_to_kernel_context),
> + SUBTEST(mock_context_barrier),
> };
> struct drm_i915_private *i915;
> int err;
--
Jani Nikula, Intel Open Source Graphics Center
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