That we use a WB mapping for updating the RING_TAIL register inside the
context image even on !llc machines has been a source of consternation
for every reader. It appears to work on bsw+, but it may just have been
that we have been incredibly bad at detecting the errors.
v2: With extra enthusiasm.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 6 ++++++
drivers/gpu/drm/i915/i915_gem.c | 2 ++
drivers/gpu/drm/i915/i915_perf.c | 3 ++-
drivers/gpu/drm/i915/intel_engine_cs.c | 2 +-
drivers/gpu/drm/i915/intel_lrc.c | 8 +++++---
drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +-
6 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e5b9d3c77139..b6eea715d506 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3070,6 +3070,12 @@ enum i915_map_type {
I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
};
+static inline enum i915_map_type
+i915_coherent_map_type(struct drm_i915_private *i915)
+{
+ return HAS_LLC(i915) ? I915_MAP_WB : I915_MAP_WC;
+}
+
/**
* i915_gem_object_pin_map - return a contiguous mapping of the entire object
* @obj: the object to map into kernel address space
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0453eb42a1a3..71832e2c85ad 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5404,6 +5404,8 @@ static int __intel_engines_record_defaults(struct
drm_i915_private *i915)
for_each_engine(engine, i915, id) {
struct i915_vma *state;
+ GEM_BUG_ON(to_intel_context(ctx, engine)->pin_count);
+
state = to_intel_context(ctx, engine)->state;
if (!state)
continue;
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 0376338d1f8d..d2ba7a641866 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1849,7 +1849,8 @@ static int gen8_configure_all_contexts(struct
drm_i915_private *dev_priv,
if (!ce->state)
continue;
- regs = i915_gem_object_pin_map(ce->state->obj, I915_MAP_WB);
+ regs = i915_gem_object_pin_map(ce->state->obj,
+ i915_coherent_map_type(dev_priv));
if (IS_ERR(regs)) {
ret = PTR_ERR(regs);
goto out;
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
b/drivers/gpu/drm/i915/intel_engine_cs.c
index 8628567d8f6e..2579151c1e05 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1157,7 +1157,7 @@ void intel_engines_unpark(struct drm_i915_private *i915)
map = NULL;
if (engine->default_state)
map = i915_gem_object_pin_map(engine->default_state,
- I915_MAP_WB);
+ I915_MAP_FORCE_WB);
if (!IS_ERR_OR_NULL(map))
engine->pinned_default_state = map;
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 803f22ab275c..4b9ae2d9bbbe 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1311,7 +1311,7 @@ static int __context_pin(struct i915_gem_context *ctx,
struct i915_vma *vma)
* on an active context (which by nature is already on the GPU).
*/
if (!(vma->flags & I915_VMA_GLOBAL_BIND)) {
- err = i915_gem_object_set_to_gtt_domain(vma->obj, true);
+ err = i915_gem_object_set_to_wc_domain(vma->obj, true);
if (err)
return err;
}
@@ -1339,7 +1339,9 @@ __execlists_context_pin(struct intel_engine_cs *engine,
if (ret)
goto err;
- vaddr = i915_gem_object_pin_map(ce->state->obj, I915_MAP_WB);
+ vaddr = i915_gem_object_pin_map(ce->state->obj,
+ i915_coherent_map_type(ctx->i915) |
+ I915_MAP_OVERRIDE);
if (IS_ERR(vaddr)) {
ret = PTR_ERR(vaddr);
goto unpin_vma;
@@ -2706,7 +2708,7 @@ populate_lr_context(struct i915_gem_context *ctx,
void *defaults;
defaults = i915_gem_object_pin_map(engine->default_state,
- I915_MAP_WB);
+ I915_MAP_FORCE_WB);
if (IS_ERR(defaults)) {
ret = PTR_ERR(defaults);
goto err_unpin_ctx;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index d40f55a8dc34..3d82f6b5c229 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1285,7 +1285,7 @@ alloc_context_vma(struct intel_engine_cs *engine)
}
defaults = i915_gem_object_pin_map(engine->default_state,
- I915_MAP_WB);
+ I915_MAP_FORCE_WB);
if (IS_ERR(defaults)) {
err = PTR_ERR(defaults);
goto err_map;
--
2.18.0
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