drm/i915/selftests: Use a sacrificial context for hang testing

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@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Michel Thierry <michel.thierry@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180205152431.12163-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
index a42c539..d1d2c24 100644 (file)
--- 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 @@ err_obj:
        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 @@ unpin_vma:
 }
 
 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;
 
@@ -307,6 +314,8 @@ 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);
 }
 
@@ -342,7 +351,7 @@ 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",
@@ -479,8 +488,7 @@ 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);
@@ -687,8 +695,7 @@ 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);
@@ -843,7 +850,7 @@ 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;
@@ -922,7 +929,7 @@ 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;
@@ -936,9 +943,7 @@ 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;
@@ -1049,7 +1054,7 @@ 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 bbf80d4..501becc 100644 (file)
--- 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)
+{
+       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 2f432c0..29b9d60 100644 (file)
--- 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 */