From f4e15af7e21861445821d5f09922ef7e695269a1 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 10 Nov 2017 14:26:32 +0000
Subject: [PATCH] drm/i915: Mark the context state as dirty/written
Git-commit: f4e15af7e21861445821d5f09922ef7e695269a1
Patch-mainline: v4.16-rc1
References: FATE#322643 bsc#1055900

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
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_lrc.c        |   32 ++++++++++++++++++++++++--------
 drivers/gpu/drm/i915/intel_ringbuffer.c |    6 +++---
 2 files changed, 27 insertions(+), 11 deletions(-)

--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1080,12 +1080,34 @@ static void execlists_schedule(struct dr
 	spin_unlock_irq(&engine->timeline->lock);
 }
 
+static int __context_pin(struct i915_gem_context *ctx, struct i915_vma *vma)
+{
+	unsigned int flags;
+	int err;
+
+	/*
+	 * 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)) {
+		err = i915_gem_object_set_to_gtt_domain(vma->obj, true);
+		if (err)
+			return err;
+	}
+
+	flags = PIN_GLOBAL | PIN_HIGH;
+	if (ctx->ggtt_offset_bias)
+		flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias;
+
+	return i915_vma_pin(vma, 0, GEN8_LR_CONTEXT_ALIGN, flags);
+}
+
 static struct intel_ring *
 execlists_context_pin(struct intel_engine_cs *engine,
 		      struct i915_gem_context *ctx)
 {
 	struct intel_context *ce = &ctx->engine[engine->id];
-	unsigned int flags;
 	void *vaddr;
 	int ret;
 
@@ -1102,11 +1124,7 @@ execlists_context_pin(struct intel_engin
 	}
 	GEM_BUG_ON(!ce->state);
 
-	flags = PIN_GLOBAL | PIN_HIGH;
-	if (ctx->ggtt_offset_bias)
-		flags |= PIN_OFFSET_BIAS | ctx->ggtt_offset_bias;
-
-	ret = i915_vma_pin(ce->state, 0, GEN8_LR_CONTEXT_ALIGN, flags);
+	ret = __context_pin(ctx, ce->state);
 	if (ret)
 		goto err;
 
@@ -1126,9 +1144,7 @@ execlists_context_pin(struct intel_engin
 	ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
 		i915_ggtt_offset(ce->ring->vma);
 
-	ce->state->obj->mm.dirty = true;
 	ce->state->obj->pin_global++;
-
 	i915_gem_context_get(ctx);
 out:
 	return ce->ring;
--- 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_c
 	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_engi
 		if (ret)
 			goto err;
 
-		ce->state->obj->mm.dirty = true;
 		ce->state->obj->pin_global++;
 	}