Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> Avoid injecting hangs in to the i915->kernel_context in case the GPU
> reset leaves corruption in the context image in its wake (leading to
> continual failures and system hangs after the selftests are ostensibly
> complete). Use a sacrificial kernel_context instead.
>
> v2: Closing a context is tricky; export a function (for selftests) from
> i915_gem_context.c to get it right.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Cc: Michel Thierry <michel.thierry@xxxxxxxxx
> ---
> drivers/gpu/drm/i915/selftests/intel_hangcheck.c | 39 +++++++++++++-----------
> drivers/gpu/drm/i915/selftests/mock_context.c | 11 +++++++
> drivers/gpu/drm/i915/selftests/mock_context.h | 3 ++
> 3 files changed, 36 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
> index a4f4ff22389b..e0b662a2b8ae 100644
> --- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
> +++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
> @@ -33,6 +33,7 @@ struct hang {
> struct drm_i915_private *i915;
> struct drm_i915_gem_object *hws;
> struct drm_i915_gem_object *obj;
> + struct i915_gem_context *ctx;
> u32 *seqno;
> u32 *batch;
> };
> @@ -45,9 +46,15 @@ static int hang_init(struct hang *h, struct drm_i915_private *i915)
> memset(h, 0, sizeof(*h));
> h->i915 = i915;
>
> + h->ctx = kernel_context(i915);
> + if (IS_ERR(h->ctx))
> + return PTR_ERR(h->ctx);
> +
> h->hws = i915_gem_object_create_internal(i915, PAGE_SIZE);
> - if (IS_ERR(h->hws))
> - return PTR_ERR(h->hws);
> + if (IS_ERR(h->hws)) {
> + err = PTR_ERR(h->hws);
> + goto err_ctx;
> + }
>
> h->obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
> if (IS_ERR(h->obj)) {
> @@ -79,6 +86,8 @@ static int hang_init(struct hang *h, struct drm_i915_private *i915)
> i915_gem_object_put(h->obj);
> err_hws:
> i915_gem_object_put(h->hws);
> +err_ctx:
> + kernel_context_close(h->ctx);
> return err;
> }
>
> @@ -196,9 +205,7 @@ static int emit_recurse_batch(struct hang *h,
> }
>
> static struct drm_i915_gem_request *
> -hang_create_request(struct hang *h,
> - struct intel_engine_cs *engine,
> - struct i915_gem_context *ctx)
> +hang_create_request(struct hang *h, struct intel_engine_cs *engine)
> {
> struct drm_i915_gem_request *rq;
> int err;
> @@ -225,7 +232,7 @@ hang_create_request(struct hang *h,
> h->batch = vaddr;
> }
>
> - rq = i915_gem_request_alloc(engine, ctx);
> + rq = i915_gem_request_alloc(engine, h->ctx);
> if (IS_ERR(rq))
> return rq;
>
> @@ -306,6 +313,8 @@ static void hang_fini(struct hang *h)
> i915_gem_object_unpin_map(h->hws);
> i915_gem_object_put(h->hws);
>
> + kernel_context_close(h->ctx);
> +
> flush_test(h->i915, I915_WAIT_LOCKED);
> }
>
> @@ -341,7 +350,7 @@ static int igt_hang_sanitycheck(void *arg)
> if (!intel_engine_can_store_dword(engine))
> continue;
>
> - rq = hang_create_request(&h, engine, i915->kernel_context);
> + rq = hang_create_request(&h, engine);
> if (IS_ERR(rq)) {
> err = PTR_ERR(rq);
> pr_err("Failed to create request for %s, err=%d\n",
> @@ -478,8 +487,7 @@ static int __igt_reset_engine(struct drm_i915_private *i915, bool active)
> struct drm_i915_gem_request *rq;
>
> mutex_lock(&i915->drm.struct_mutex);
> - rq = hang_create_request(&h, engine,
> - i915->kernel_context);
> + rq = hang_create_request(&h, engine);
> if (IS_ERR(rq)) {
> err = PTR_ERR(rq);
> mutex_unlock(&i915->drm.struct_mutex);
> @@ -686,8 +694,7 @@ static int __igt_reset_engine_others(struct drm_i915_private *i915,
> struct drm_i915_gem_request *rq;
>
> mutex_lock(&i915->drm.struct_mutex);
> - rq = hang_create_request(&h, engine,
> - i915->kernel_context);
> + rq = hang_create_request(&h, engine);
> if (IS_ERR(rq)) {
> err = PTR_ERR(rq);
> mutex_unlock(&i915->drm.struct_mutex);
> @@ -842,7 +849,7 @@ static int igt_wait_reset(void *arg)
> if (err)
> goto unlock;
>
> - rq = hang_create_request(&h, i915->engine[RCS], i915->kernel_context);
> + rq = hang_create_request(&h, i915->engine[RCS]);
> if (IS_ERR(rq)) {
> err = PTR_ERR(rq);
> goto fini;
> @@ -921,7 +928,7 @@ static int igt_reset_queue(void *arg)
> if (!intel_engine_can_store_dword(engine))
> continue;
>
> - prev = hang_create_request(&h, engine, i915->kernel_context);
> + prev = hang_create_request(&h, engine);
> if (IS_ERR(prev)) {
> err = PTR_ERR(prev);
> goto fini;
> @@ -935,9 +942,7 @@ static int igt_reset_queue(void *arg)
> struct drm_i915_gem_request *rq;
> unsigned int reset_count;
>
> - rq = hang_create_request(&h,
> - engine,
> - i915->kernel_context);
> + rq = hang_create_request(&h, engine);
> if (IS_ERR(rq)) {
> err = PTR_ERR(rq);
> goto fini;
> @@ -1048,7 +1053,7 @@ static int igt_handle_error(void *arg)
> if (err)
> goto err_unlock;
>
> - rq = hang_create_request(&h, engine, i915->kernel_context);
> + rq = hang_create_request(&h, engine);
> if (IS_ERR(rq)) {
> err = PTR_ERR(rq);
> goto err_fini;
> diff --git a/drivers/gpu/drm/i915/selftests/mock_context.c b/drivers/gpu/drm/i915/selftests/mock_context.c
> index bbf80d42e793..501becc47c0c 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_context.c
> +++ b/drivers/gpu/drm/i915/selftests/mock_context.c
> @@ -92,3 +92,14 @@ live_context(struct drm_i915_private *i915, struct drm_file *file)
>
> return i915_gem_create_context(i915, file->driver_priv);
> }
> +
> +struct i915_gem_context *
> +kernel_context(struct drm_i915_private *i915)
kernel_context_create would be more symmetric.
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> +{
> + return i915_gem_context_create_kernel(i915, I915_PRIORITY_NORMAL);
> +}
> +
> +void kernel_context_close(struct i915_gem_context *ctx)
> +{
> + context_close(ctx);
> +}
> diff --git a/drivers/gpu/drm/i915/selftests/mock_context.h b/drivers/gpu/drm/i915/selftests/mock_context.h
> index 2f432c03d413..29b9d60a158b 100644
> --- a/drivers/gpu/drm/i915/selftests/mock_context.h
> +++ b/drivers/gpu/drm/i915/selftests/mock_context.h
> @@ -36,4 +36,7 @@ void mock_context_close(struct i915_gem_context *ctx);
> struct i915_gem_context *
> live_context(struct drm_i915_private *i915, struct drm_file *file);
>
> +struct i915_gem_context *kernel_context(struct drm_i915_private *i915);
> +void kernel_context_close(struct i915_gem_context *ctx);
> +
> #endif /* !__MOCK_CONTEXT_H */
> --
> 2.15.1
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