From 0f25e87460d99ef09e46a075af6d9d43f0ec6090 Mon Sep 17 00:00:00 2001
From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date: Mon, 3 Feb 2020 18:33:12 +0200
Subject: drm/i915: Remove lite restore defines
Git-commit: 48d7fb181a9102e4936700367db8d5a04bb12c2c
Patch-mainline: v5.7-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322
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
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 18 ------------------
1 file changed, 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 7a0f72f48309..da52b1d3a1af 100644
--- 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 */
--
2.28.0