drm/i915: Rework GPU reset sequence to match driver load & thaw
This patch is to address Daniels concerns over different code during reset:
http://lists.freedesktop.org/archives/intel-gfx/2014-June/047758.html
"The reason for aiming as hard as possible to use the exact same code for
driver load, gpu reset and runtime pm/system resume is that we've simply
seen too many bugs due to slight variations and unintended omissions."
Tested using igt drv_hangman.
V2: Cleaner way of preventing check_wedge returning -EAGAIN
V3: Clean the last_context during reset, to ensure do_switch() does the MI_SET_CONTEXT. As per review.
Signed-off-by: McAulay, Alistair <alistair.mcaulay@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
[danvet: Rebase over ctx->ppgtt rework and extend the comment in
check_wedge a bit.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 9683e62..0fdb357 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -289,34 +289,17 @@
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
- /* Prevent the hardware from restoring the last context (which hung) on
- * the next switch */
for (i = 0; i < I915_NUM_RINGS; i++) {
struct intel_engine_cs *ring = &dev_priv->ring[i];
- struct intel_context *dctx = ring->default_context;
struct intel_context *lctx = ring->last_context;
- /* Do a fake switch to the default context */
- if (lctx == dctx)
- continue;
+ if (lctx) {
+ if (lctx->legacy_hw_ctx.rcs_state && i == RCS)
+ i915_gem_object_ggtt_unpin(lctx->legacy_hw_ctx.rcs_state);
- if (!lctx)
- continue;
-
- if (dctx->legacy_hw_ctx.rcs_state && i == RCS) {
- WARN_ON(i915_gem_obj_ggtt_pin(dctx->legacy_hw_ctx.rcs_state,
- get_context_alignment(dev), 0));
- /* Fake a finish/inactive */
- dctx->legacy_hw_ctx.rcs_state->base.write_domain = 0;
- dctx->legacy_hw_ctx.rcs_state->active = 0;
+ i915_gem_context_unreference(lctx);
+ ring->last_context = NULL;
}
-
- if (lctx->legacy_hw_ctx.rcs_state && i == RCS)
- i915_gem_object_ggtt_unpin(lctx->legacy_hw_ctx.rcs_state);
-
- i915_gem_context_unreference(lctx);
- i915_gem_context_reference(dctx);
- ring->last_context = dctx;
}
}
@@ -412,10 +395,6 @@
struct intel_engine_cs *ring;
int ret, i;
- /* FIXME: We should make this work, even in reset */
- if (i915_reset_in_progress(&dev_priv->gpu_error))
- return 0;
-
BUG_ON(!dev_priv->ring[RCS].default_context);
for_each_ring(ring, dev_priv, i) {
@@ -558,7 +537,7 @@
from = ring->last_context;
if (to->ppgtt) {
- ret = to->ppgtt->switch_mm(to->ppgtt, ring, false);
+ ret = to->ppgtt->switch_mm(to->ppgtt, ring);
if (ret)
goto unpin_out;
}