@@ -1598,6 +1598,7 @@ static int switch_context(struct i915_request *rq)
to_gen6_ppgtt(to_ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt);
struct i915_gem_context *from_ctx = engine->legacy_active_context;
struct gen6_hw_ppgtt *from_mm = engine->legacy_active_ppgtt;
+ unsigned int unwind_mm = 0;
u32 hw_flags = 0;
int ret, i;
@@ -1611,8 +1612,13 @@ static int switch_context(struct i915_request *rq)
if (ret)
goto err;
- to_mm->base.pd_dirty_rings &= ~intel_engine_flag(engine);
+ if (to_mm->base.pd_dirty_rings & intel_engine_flag(engine)) {
+ unwind_mm = intel_engine_flag(engine);
+ to_mm->base.pd_dirty_rings &= ~unwind_mm;
+ }
+
engine->legacy_active_ppgtt = to_mm;
+
hw_flags = MI_FORCE_RESTORE;
}
@@ -1655,6 +1661,8 @@ static int switch_context(struct i915_request *rq)
err_ctx:
engine->legacy_active_context = from_ctx;
err_mm:
+ if (unwind_mm)
+ to_mm->base.pd_dirty_rings |= unwind_mm;
engine->legacy_active_ppgtt = from_mm;
err:
return ret;
If we interrupt the context switch and unwind, we leave the to_mm believing that we have cleared the dirty bit for this engine (but the LRI will never take place). Just in case we immediately reload the same context, mark this engine as dirty so that we force the LRI to reload the PD. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Cc: Matthew Auld <matthew.william.auld@gmail.com> --- drivers/gpu/drm/i915/intel_ringbuffer.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)