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

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 789f750..6020a94 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/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

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 53718a2..7687483 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/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;

diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index ae66834..23812ec 100644 (file)
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/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

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 02d8974..79c0021 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/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_ */