drm/i915: Remove lite restore defines

We have switched from tail manipulation to forced context restore
to implement WaIdleLiteRestore. Remove the old defines and comments.

Note: we still do emit the WA tail, and use it as our first attempt to
avoid forcing a full-restore instead of a lite-restore, we just have a
much stronger backup mechanism for repeated preemptions.

References: f26a9e959a7b ("drm/i915/gt: Detect if we miss WaIdleLiteRestore")
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200203163312.15475-1-mika.kuoppala@linux.intel.com

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index b5baaea..4bedc66 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -176,8 +176,6 @@
 
 /* Typical size of the average request (2 pipecontrols and a MI_BB) */
 #define EXECLISTS_REQUEST_SIZE 64 /* bytes */
-#define WA_TAIL_DWORDS 2
-#define WA_TAIL_BYTES (sizeof(u32) * WA_TAIL_DWORDS)
 
 struct virtual_engine {
        struct intel_engine_cs base;
@@ -2935,22 +2933,6 @@ static void execlists_context_reset(struct intel_context *ce)
        CE_TRACE(ce, "reset\n");
        GEM_BUG_ON(!intel_context_is_pinned(ce));
 
-       /*
-        * Because we emit WA_TAIL_DWORDS there may be a disparity
-        * between our bookkeeping in ce->ring->head and ce->ring->tail and
-        * that stored in context. As we only write new commands from
-        * ce->ring->tail onwards, everything before that is junk. If the GPU
-        * starts reading from its RING_HEAD from the context, it may try to
-        * execute that junk and die.
-        *
-        * The contexts that are stilled pinned on resume belong to the
-        * kernel, and are local to each engine. All other contexts will
-        * have their head/tail sanitized upon pinning before use, so they
-        * will never see garbage,
-        *
-        * So to avoid that we reset the context images upon resume. For
-        * simplicity, we just zero everything out.
-        */
        intel_ring_reset(ce->ring, ce->ring->emit);
 
        /* Scrub away the garbage */