drm/i915: Mark the context state as dirty/written

In the next few patches, we will want to both copy out of the context
image and write a valid image into a new context. To be completely safe,
we should then couple in our domain tracking to ensure that we don't
have any issues with stale data remaining in unwanted cachelines.

Historically, we omitted the .write=true from the call to set-gtt-domain
in i915_switch_context() in order to avoid a stall between every request
as we would want to wait for the previous context write from the gpu.
Since then, we limit the set-gtt-domain to only occur when we first bind
the vma, so once in use we will never stall, and we are sure to flush
the context following a load from swap.

Equally we never applied the lessons learnt from ringbuffer submission
to execlists; so time to apply the flush of the lrc after load as well.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110142634.10551-6-chris@chris-wilson.co.uk

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 47fadf8da84e..7e2a671882fb 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1363,12 +1363,13 @@ static int context_pin(struct i915_gem_context *ctx)
         struct i915_vma *vma = ctx->engine[RCS].state;
         int ret;
 
-        /* Clear this page out of any CPU caches for coherent swap-in/out.
+        /*
+         * Clear this page out of any CPU caches for coherent swap-in/out.
          * We only want to do this on the first bind so that we do not stall
          * on an active context (which by nature is already on the GPU).
          */
         if (!(vma->flags & I915_VMA_GLOBAL_BIND)) {
-                ret = i915_gem_object_set_to_gtt_domain(vma->obj, false);
+                ret = i915_gem_object_set_to_gtt_domain(vma->obj, true);
                 if (ret)
                         return ret;
         }
@@ -1445,7 +1446,6 @@ intel_ring_context_pin(struct intel_engine_cs *engine,
                 if (ret)
                         goto err;
 
-                ce->state->obj->mm.dirty = true;
                 ce->state->obj->pin_global++;
         }