drm/i915: Remove unused live_context_for_engine

The last use of live_context_for_engine() was removed in 2021 by
commit 99919be ("drm/i915/gem: Zap the i915_gem_object_blt code")

Remove it.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20250125003846.228514-1-linux@treblig.org
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Author: Dr. David Alan Gilbert

drivers/gpu/drm/i915/gem/selftests/mock_context.c

@@ -107,44 +107,6 @@ live_context(struct drm_i915_private *i915, struct file *file)
 	return ERR_PTR(err);
 }
 
-struct i915_gem_context *
-live_context_for_engine(struct intel_engine_cs *engine, struct file *file)
-{
-	struct i915_gem_engines *engines;
-	struct i915_gem_context *ctx;
-	struct intel_sseu null_sseu = {};
-	struct intel_context *ce;
-
-	engines = alloc_engines(1);
-	if (!engines)
-		return ERR_PTR(-ENOMEM);
-
-	ctx = live_context(engine->i915, file);
-	if (IS_ERR(ctx)) {
-		__free_engines(engines, 0);
-		return ctx;
-	}
-
-	ce = intel_context_create(engine);
-	if (IS_ERR(ce)) {
-		__free_engines(engines, 0);
-		return ERR_CAST(ce);
-	}
-
-	intel_context_set_gem(ce, ctx, null_sseu);
-	engines->engines[0] = ce;
-	engines->num_engines = 1;
-
-	mutex_lock(&ctx->engines_mutex);
-	i915_gem_context_set_user_engines(ctx);
-	engines = rcu_replace_pointer(ctx->engines, engines, 1);
-	mutex_unlock(&ctx->engines_mutex);
-
-	engines_idle_release(ctx, engines);
-
-	return ctx;
-}
-
 struct i915_gem_context *
 kernel_context(struct drm_i915_private *i915,
 	       struct i915_address_space *vm)

drivers/gpu/drm/i915/gem/selftests/mock_context.h

@@ -23,9 +23,6 @@ void mock_context_close(struct i915_gem_context *ctx);
 struct i915_gem_context *
 live_context(struct drm_i915_private *i915, struct file *file);
 
-struct i915_gem_context *
-live_context_for_engine(struct intel_engine_cs *engine, struct file *file);
-
 struct i915_gem_context *kernel_context(struct drm_i915_private *i915,
 					struct i915_address_space *vm);
 void kernel_context_close(struct i915_gem_context *ctx);