drm/i915: Disable MI_STORE_DATA_IMM for i915g/i915gm

The early gen3 machines (i915g/Grantsdale and i915gm/Alviso) share a lot
of characteristics in their MI/GTT blocks with gen2, and in particular
can only use physical addresses in MI_STORE_DATA_IMM. This makes it
incompatible with our usage, so include those two machines in the
blacklist to prevent usage.

v2: Make it easy for gcc and rewrite it as a switch to save some space.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20170906152859.5304-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -4360,11 +4360,4 @@ int remap_io_mapping(struct vm_area_struct *vma,
 		     unsigned long addr, unsigned long pfn, unsigned long size,
 		     struct io_mapping *iomap);
 
-static inline bool
-intel_engine_can_store_dword(struct intel_engine_cs *engine)
-{
-	return __intel_engine_can_store_dword(INTEL_GEN(engine->i915),
-					      engine->class);
-}
-
 #endif

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -1168,6 +1168,9 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb,
 		if (eb_use_cmdparser(eb))
 			return ERR_PTR(-EWOULDBLOCK);
 
+		if (!intel_engine_can_store_dword(eb->engine))
+			return ERR_PTR(-ENODEV);
+
 		err = __reloc_gpu_alloc(eb, vma, len);
 		if (unlikely(err))
 			return ERR_PTR(err);
@@ -1192,9 +1195,7 @@ relocate_entry(struct i915_vma *vma,
 
 	if (!eb->reloc_cache.vaddr &&
 	    (DBG_FORCE_RELOC == FORCE_GPU_RELOC ||
-	     !reservation_object_test_signaled_rcu(vma->resv, true)) &&
-	    __intel_engine_can_store_dword(eb->reloc_cache.gen,
-					   eb->engine->class)) {
+	     !reservation_object_test_signaled_rcu(vma->resv, true))) {
 		const unsigned int gen = eb->reloc_cache.gen;
 		unsigned int len;
 		u32 *batch;

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -1378,6 +1378,21 @@ void intel_engines_mark_idle(struct drm_i915_private *i915)
 	}
 }
 
+bool intel_engine_can_store_dword(struct intel_engine_cs *engine)
+{
+	switch (INTEL_GEN(engine->i915)) {
+	case 2:
+		return false; /* uses physical not virtual addresses */
+	case 3:
+		/* maybe only uses physical not virtual addresses */
+		return !(IS_I915G(engine->i915) || IS_I915GM(engine->i915));
+	case 6:
+		return engine->class != VIDEO_DECODE_CLASS; /* b0rked */
+	default:
+		return true;
+	}
+}
+
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 #include "selftests/mock_engine.c"
 #endif

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -735,16 +735,6 @@ bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
 void intel_engines_mark_idle(struct drm_i915_private *i915);
 void intel_engines_reset_default_submission(struct drm_i915_private *i915);
 
-static inline bool
-__intel_engine_can_store_dword(unsigned int gen, unsigned int class)
-{
-	if (gen <= 2)
-		return false; /* uses physical not virtual addresses */
-
-	if (gen == 6 && class == VIDEO_DECODE_CLASS)
-		return false; /* b0rked */
-
-	return true;
-}
+bool intel_engine_can_store_dword(struct intel_engine_cs *engine);
 
 #endif /* _INTEL_RINGBUFFER_H_ */