drm/i915/gt: Do not restore invalid RS state

Only restore valid resource streamer state from the context image, i.e.
avoid restoring if we know the image is invalid.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/446
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191229183153.3719869-4-chris@chris-wilson.co.uk
Cc: stable@vger.kernel.org
(cherry picked from commit ecfcd2da335816516dc27434a65899a77886d80a)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index a47d5a7..9302621 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -1413,14 +1413,6 @@ static inline int mi_set_context(struct i915_request *rq, u32 flags)
        int len;
        u32 *cs;
 
-       flags |= MI_MM_SPACE_GTT;
-       if (IS_HASWELL(i915))
-               /* These flags are for resource streamer on HSW+ */
-               flags |= HSW_MI_RS_SAVE_STATE_EN | HSW_MI_RS_RESTORE_STATE_EN;
-       else
-               /* We need to save the extended state for powersaving modes */
-               flags |= MI_SAVE_EXT_STATE_EN | MI_RESTORE_EXT_STATE_EN;
-
        len = 4;
        if (IS_GEN(i915, 7))
                len += 2 + (num_engines ? 4 * num_engines + 6 : 0);
@@ -1589,22 +1581,21 @@ static int switch_context(struct i915_request *rq)
        }
 
        if (ce->state) {
-               u32 hw_flags;
+               u32 flags;
 
                GEM_BUG_ON(rq->engine->id != RCS0);
 
-               /*
-                * The kernel context(s) is treated as pure scratch and is not
-                * expected to retain any state (as we sacrifice it during
-                * suspend and on resume it may be corrupted). This is ok,
-                * as nothing actually executes using the kernel context; it
-                * is purely used for flushing user contexts.
-                */
-               hw_flags = 0;
-               if (i915_gem_context_is_kernel(rq->gem_context))
-                       hw_flags = MI_RESTORE_INHIBIT;
+               /* For resource streamer on HSW+ and power context elsewhere */
+               BUILD_BUG_ON(HSW_MI_RS_SAVE_STATE_EN != MI_SAVE_EXT_STATE_EN);
+               BUILD_BUG_ON(HSW_MI_RS_RESTORE_STATE_EN != MI_RESTORE_EXT_STATE_EN);
+
+               flags = MI_SAVE_EXT_STATE_EN | MI_MM_SPACE_GTT;
+               if (!i915_gem_context_is_kernel(rq->gem_context))
+                       flags |= MI_RESTORE_EXT_STATE_EN;
+               else
+                       flags |= MI_RESTORE_INHIBIT;
 
-               ret = mi_set_context(rq, hw_flags);
+               ret = mi_set_context(rq, flags);
                if (ret)
                        return ret;
        }