From 4b6ce6810a5dc0af387a238e8c852e0d3822381f Mon Sep 17 00:00:00 2001
From: Rafael Antognolli <rafael.antognolli@intel.com>
Date: Mon, 5 Feb 2018 15:33:30 -0800
Subject: [PATCH] drm/i915/cnl: WaPipeControlBefore3DStateSamplePattern
Git-commit: 4b6ce6810a5dc0af387a238e8c852e0d3822381f
Patch-mainline: v4.17-rc1
References: FATE#322643 bsc#1055900

This workaround should prevent a bug that can be hit on a context
restore. To avoid the issue, we must emit a PIPE_CONTROL with CS stall
(0x7a000004 0x00100000 0x00000000 0x00000000) followed by 12DW's of
NOOP(0x0) in the indirect context batch buffer, to ensure the engine is
idle prior to programming 3DSTATE_SAMPLE_PATTERN.

It's also not clear whether we should add those extra dwords because of
the workaround itself, or if that's just padding for the WA BB (and next
commands could come right after the PIPE_CONTROL). We keep them for now.

References: HSD#1939868

 v2: More descriptive changelog and comments.
 v3: Explain that PIPE_CONTROL is actually 6 dwords, and that we advance
     10 more dwords because of that.

Signed-off-by: Rafael Antognolli <rafael.antognolli@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Acked-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/20180205233330.14973-1-rafael.antognolli@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_lrc.c |   38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1333,6 +1333,40 @@ static u32 *gen9_init_indirectctx_bb(str
 	return batch;
 }
 
+static u32 *
+gen10_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
+{
+	int i;
+
+	/*
+	 * WaPipeControlBefore3DStateSamplePattern: cnl
+	 *
+	 * Ensure the engine is idle prior to programming a
+	 * 3DSTATE_SAMPLE_PATTERN during a context restore.
+	 */
+	batch = gen8_emit_pipe_control(batch,
+				       PIPE_CONTROL_CS_STALL,
+				       0);
+	/*
+	 * WaPipeControlBefore3DStateSamplePattern says we need 4 dwords for
+	 * the PIPE_CONTROL followed by 12 dwords of 0x0, so 16 dwords in
+	 * total. However, a PIPE_CONTROL is 6 dwords long, not 4, which is
+	 * confusing. Since gen8_emit_pipe_control() already advances the
+	 * batch by 6 dwords, we advance the other 10 here, completing a
+	 * cacheline. It's not clear if the workaround requires this padding
+	 * before other commands, or if it's just the regular padding we would
+	 * already have for the workaround bb, so leave it here for now.
+	 */
+	for (i = 0; i < 10; i++)
+		*batch++ = MI_NOOP;
+
+	/* Pad to end of cacheline */
+	while ((unsigned long)batch % CACHELINE_BYTES)
+		*batch++ = MI_NOOP;
+
+	return batch;
+}
+
 #define CTX_WA_BB_OBJ_SIZE (PAGE_SIZE)
 
 static int lrc_setup_wa_ctx(struct intel_engine_cs *engine)
@@ -1386,7 +1420,9 @@ static int intel_init_workaround_bb(stru
 
 	switch (INTEL_GEN(engine->i915)) {
 	case 10:
-		return 0;
+		wa_bb_fn[0] = gen10_init_indirectctx_bb;
+		wa_bb_fn[1] = NULL;
+		break;
 	case 9:
 		wa_bb_fn[0] = gen9_init_indirectctx_bb;
 		wa_bb_fn[1] = NULL;