[Intel-gfx] [CI 3/3] drm/i915: split gen8+ flush and bb_start emission functions to their own file

[Chris Wilson <chris@chris-wilson.co.uk>]

From: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>

These functions are independent from the backend used and can therefore
be split out of the exelists submission file, so they can be re-used by
the upcoming GuC submission backend.

Based on a patch by Chris Wilson.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris P Wilson <chris.p.wilson@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
---
 drivers/gpu/drm/i915/Makefile                 |   1 +
 drivers/gpu/drm/i915/gt/gen8_engine_cs.c      | 617 +++++++++++++++++
 drivers/gpu/drm/i915/gt/gen8_engine_cs.h      |  36 +
 .../drm/i915/gt/intel_execlists_submission.c  | 629 +-----------------
 4 files changed, 662 insertions(+), 621 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/gt/gen8_engine_cs.c
 create mode 100644 drivers/gpu/drm/i915/gt/gen8_engine_cs.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index aedbd8f52be8..f9ef5199b124 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -82,6 +82,7 @@ gt-y += \
 	gt/gen6_engine_cs.o \
 	gt/gen6_ppgtt.o \
 	gt/gen7_renderclear.o \
+	gt/gen8_engine_cs.o \
 	gt/gen8_ppgtt.o \
 	gt/intel_breadcrumbs.o \
 	gt/intel_context.o \
diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
new file mode 100644
index 000000000000..762cb0f33bfc
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -0,0 +1,617 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2014 Intel Corporation
+ */
+
+#include "gen8_engine_cs.h" /* XXX */
+#include "i915_drv.h"
+#include "intel_execlists_submission.h" /* XXX */
+#include "intel_gpu_commands.h"
+#include "intel_ring.h"
+
+int gen8_emit_flush_rcs(struct i915_request *rq, u32 mode)
+{
+	bool vf_flush_wa = false, dc_flush_wa = false;
+	u32 *cs, flags = 0;
+	int len;
+
+	flags |= PIPE_CONTROL_CS_STALL;
+
+	if (mode & EMIT_FLUSH) {
+		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
+		flags |= PIPE_CONTROL_FLUSH_ENABLE;
+	}
+
+	if (mode & EMIT_INVALIDATE) {
+		flags |= PIPE_CONTROL_TLB_INVALIDATE;
+		flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_QW_WRITE;
+		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
+
+		/*
+		 * On GEN9: before VF_CACHE_INVALIDATE we need to emit a NULL
+		 * pipe control.
+		 */
+		if (IS_GEN(rq->engine->i915, 9))
+			vf_flush_wa = true;
+
+		/* WaForGAMHang:kbl */
+		if (IS_KBL_GT_REVID(rq->engine->i915, 0, KBL_REVID_B0))
+			dc_flush_wa = true;
+	}
+
+	len = 6;
+
+	if (vf_flush_wa)
+		len += 6;
+
+	if (dc_flush_wa)
+		len += 12;
+
+	cs = intel_ring_begin(rq, len);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	if (vf_flush_wa)
+		cs = gen8_emit_pipe_control(cs, 0, 0);
+
+	if (dc_flush_wa)
+		cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_DC_FLUSH_ENABLE,
+					    0);
+
+	cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
+
+	if (dc_flush_wa)
+		cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_CS_STALL, 0);
+
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+int gen8_emit_flush_xcs(struct i915_request *rq, u32 mode)
+{
+	u32 cmd, *cs;
+
+	cs = intel_ring_begin(rq, 4);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	cmd = MI_FLUSH_DW + 1;
+
+	/* We always require a command barrier so that subsequent
+	 * commands, such as breadcrumb interrupts, are strictly ordered
+	 * wrt the contents of the write cache being flushed to memory
+	 * (and thus being coherent from the CPU).
+	 */
+	cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
+
+	if (mode & EMIT_INVALIDATE) {
+		cmd |= MI_INVALIDATE_TLB;
+		if (rq->engine->class == VIDEO_DECODE_CLASS)
+			cmd |= MI_INVALIDATE_BSD;
+	}
+
+	*cs++ = cmd;
+	*cs++ = LRC_PPHWSP_SCRATCH_ADDR;
+	*cs++ = 0; /* upper addr */
+	*cs++ = 0; /* value */
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+int gen11_emit_flush_rcs(struct i915_request *rq, u32 mode)
+{
+	if (mode & EMIT_FLUSH) {
+		u32 *cs;
+		u32 flags = 0;
+
+		flags |= PIPE_CONTROL_CS_STALL;
+
+		flags |= PIPE_CONTROL_TILE_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
+		flags |= PIPE_CONTROL_FLUSH_ENABLE;
+		flags |= PIPE_CONTROL_QW_WRITE;
+		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
+
+		cs = intel_ring_begin(rq, 6);
+		if (IS_ERR(cs))
+			return PTR_ERR(cs);
+
+		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
+		intel_ring_advance(rq, cs);
+	}
+
+	if (mode & EMIT_INVALIDATE) {
+		u32 *cs;
+		u32 flags = 0;
+
+		flags |= PIPE_CONTROL_CS_STALL;
+
+		flags |= PIPE_CONTROL_COMMAND_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_TLB_INVALIDATE;
+		flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_QW_WRITE;
+		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
+
+		cs = intel_ring_begin(rq, 6);
+		if (IS_ERR(cs))
+			return PTR_ERR(cs);
+
+		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
+		intel_ring_advance(rq, cs);
+	}
+
+	return 0;
+}
+
+static u32 preparser_disable(bool state)
+{
+	return MI_ARB_CHECK | 1 << 8 | state;
+}
+
+static i915_reg_t aux_inv_reg(const struct intel_engine_cs *engine)
+{
+	static const i915_reg_t vd[] = {
+		GEN12_VD0_AUX_NV,
+		GEN12_VD1_AUX_NV,
+		GEN12_VD2_AUX_NV,
+		GEN12_VD3_AUX_NV,
+	};
+
+	static const i915_reg_t ve[] = {
+		GEN12_VE0_AUX_NV,
+		GEN12_VE1_AUX_NV,
+	};
+
+	if (engine->class == VIDEO_DECODE_CLASS)
+		return vd[engine->instance];
+
+	if (engine->class == VIDEO_ENHANCEMENT_CLASS)
+		return ve[engine->instance];
+
+	GEM_BUG_ON("unknown aux_inv reg\n");
+	return INVALID_MMIO_REG;
+}
+
+static u32 *gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs)
+{
+	*cs++ = MI_LOAD_REGISTER_IMM(1);
+	*cs++ = i915_mmio_reg_offset(inv_reg);
+	*cs++ = AUX_INV;
+	*cs++ = MI_NOOP;
+
+	return cs;
+}
+
+int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
+{
+	if (mode & EMIT_FLUSH) {
+		u32 flags = 0;
+		u32 *cs;
+
+		flags |= PIPE_CONTROL_TILE_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_FLUSH_L3;
+		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
+		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
+		/* Wa_1409600907:tgl */
+		flags |= PIPE_CONTROL_DEPTH_STALL;
+		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
+		flags |= PIPE_CONTROL_FLUSH_ENABLE;
+
+		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
+		flags |= PIPE_CONTROL_QW_WRITE;
+
+		flags |= PIPE_CONTROL_CS_STALL;
+
+		cs = intel_ring_begin(rq, 6);
+		if (IS_ERR(cs))
+			return PTR_ERR(cs);
+
+		cs = gen12_emit_pipe_control(cs,
+					     PIPE_CONTROL0_HDC_PIPELINE_FLUSH,
+					     flags, LRC_PPHWSP_SCRATCH_ADDR);
+		intel_ring_advance(rq, cs);
+	}
+
+	if (mode & EMIT_INVALIDATE) {
+		u32 flags = 0;
+		u32 *cs;
+
+		flags |= PIPE_CONTROL_COMMAND_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_TLB_INVALIDATE;
+		flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
+		flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
+
+		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
+		flags |= PIPE_CONTROL_QW_WRITE;
+
+		flags |= PIPE_CONTROL_CS_STALL;
+
+		cs = intel_ring_begin(rq, 8 + 4);
+		if (IS_ERR(cs))
+			return PTR_ERR(cs);
+
+		/*
+		 * Prevent the pre-parser from skipping past the TLB
+		 * invalidate and loading a stale page for the batch
+		 * buffer / request payload.
+		 */
+		*cs++ = preparser_disable(true);
+
+		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
+
+		/* hsdes: 1809175790 */
+		cs = gen12_emit_aux_table_inv(GEN12_GFX_CCS_AUX_NV, cs);
+
+		*cs++ = preparser_disable(false);
+		intel_ring_advance(rq, cs);
+	}
+
+	return 0;
+}
+
+int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
+{
+	intel_engine_mask_t aux_inv = 0;
+	u32 cmd, *cs;
+
+	cmd = 4;
+	if (mode & EMIT_INVALIDATE)
+		cmd += 2;
+	if (mode & EMIT_INVALIDATE)
+		aux_inv = rq->engine->mask & ~BIT(BCS0);
+	if (aux_inv)
+		cmd += 2 * hweight8(aux_inv) + 2;
+
+	cs = intel_ring_begin(rq, cmd);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	if (mode & EMIT_INVALIDATE)
+		*cs++ = preparser_disable(true);
+
+	cmd = MI_FLUSH_DW + 1;
+
+	/* We always require a command barrier so that subsequent
+	 * commands, such as breadcrumb interrupts, are strictly ordered
+	 * wrt the contents of the write cache being flushed to memory
+	 * (and thus being coherent from the CPU).
+	 */
+	cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
+
+	if (mode & EMIT_INVALIDATE) {
+		cmd |= MI_INVALIDATE_TLB;
+		if (rq->engine->class == VIDEO_DECODE_CLASS)
+			cmd |= MI_INVALIDATE_BSD;
+	}
+
+	*cs++ = cmd;
+	*cs++ = LRC_PPHWSP_SCRATCH_ADDR;
+	*cs++ = 0; /* upper addr */
+	*cs++ = 0; /* value */
+
+	if (aux_inv) { /* hsdes: 1809175790 */
+		struct intel_engine_cs *engine;
+		unsigned int tmp;
+
+		*cs++ = MI_LOAD_REGISTER_IMM(hweight8(aux_inv));
+		for_each_engine_masked(engine, rq->engine->gt,
+				       aux_inv, tmp) {
+			*cs++ = i915_mmio_reg_offset(aux_inv_reg(engine));
+			*cs++ = AUX_INV;
+		}
+		*cs++ = MI_NOOP;
+	}
+
+	if (mode & EMIT_INVALIDATE)
+		*cs++ = preparser_disable(false);
+
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+static inline u32 preempt_address(struct intel_engine_cs *engine)
+{
+	return (i915_ggtt_offset(engine->status_page.vma) +
+		I915_GEM_HWS_PREEMPT_ADDR);
+}
+
+static u32 hwsp_offset(const struct i915_request *rq)
+{
+	const struct intel_timeline_cacheline *cl;
+
+	/* Before the request is executed, the timeline/cachline is fixed */
+
+	cl = rcu_dereference_protected(rq->hwsp_cacheline, 1);
+	if (cl)
+		return cl->ggtt_offset;
+
+	return rcu_dereference_protected(rq->timeline, 1)->hwsp_offset;
+}
+
+int gen8_emit_init_breadcrumb(struct i915_request *rq)
+{
+	u32 *cs;
+
+	GEM_BUG_ON(i915_request_has_initial_breadcrumb(rq));
+	if (!i915_request_timeline(rq)->has_initial_breadcrumb)
+		return 0;
+
+	cs = intel_ring_begin(rq, 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	/*
+	 * Check if we have been preempted before we even get started.
+	 *
+	 * After this point i915_request_started() reports true, even if
+	 * we get preempted and so are no longer running.
+	 */
+	*cs++ = MI_ARB_CHECK;
+	*cs++ = MI_NOOP;
+
+	*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
+	*cs++ = hwsp_offset(rq);
+	*cs++ = 0;
+	*cs++ = rq->fence.seqno - 1;
+
+	intel_ring_advance(rq, cs);
+
+	/* Record the updated position of the request's payload */
+	rq->infix = intel_ring_offset(rq, cs);
+
+	__set_bit(I915_FENCE_FLAG_INITIAL_BREADCRUMB, &rq->fence.flags);
+
+	return 0;
+}
+
+int gen8_emit_bb_start_noarb(struct i915_request *rq,
+			     u64 offset, u32 len,
+			     const unsigned int flags)
+{
+	u32 *cs;
+
+	cs = intel_ring_begin(rq, 4);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	/*
+	 * WaDisableCtxRestoreArbitration:bdw,chv
+	 *
+	 * We don't need to perform MI_ARB_ENABLE as often as we do (in
+	 * particular all the gen that do not need the w/a at all!), if we
+	 * took care to make sure that on every switch into this context
+	 * (both ordinary and for preemption) that arbitrartion was enabled
+	 * we would be fine.  However, for gen8 there is another w/a that
+	 * requires us to not preempt inside GPGPU execution, so we keep
+	 * arbitration disabled for gen8 batches. Arbitration will be
+	 * re-enabled before we close the request
+	 * (engine->emit_fini_breadcrumb).
+	 */
+	*cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
+
+	/* FIXME(BDW+): Address space and security selectors. */
+	*cs++ = MI_BATCH_BUFFER_START_GEN8 |
+		(flags & I915_DISPATCH_SECURE ? 0 : BIT(8));
+	*cs++ = lower_32_bits(offset);
+	*cs++ = upper_32_bits(offset);
+
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+int gen8_emit_bb_start(struct i915_request *rq,
+		       u64 offset, u32 len,
+		       const unsigned int flags)
+{
+	u32 *cs;
+
+	cs = intel_ring_begin(rq, 6);
+	if (IS_ERR(cs))
+		return PTR_ERR(cs);
+
+	*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
+
+	*cs++ = MI_BATCH_BUFFER_START_GEN8 |
+		(flags & I915_DISPATCH_SECURE ? 0 : BIT(8));
+	*cs++ = lower_32_bits(offset);
+	*cs++ = upper_32_bits(offset);
+
+	*cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
+	*cs++ = MI_NOOP;
+
+	intel_ring_advance(rq, cs);
+
+	return 0;
+}
+
+static void assert_request_valid(struct i915_request *rq)
+{
+	struct intel_ring *ring __maybe_unused = rq->ring;
+
+	/* Can we unwind this request without appearing to go forwards? */
+	GEM_BUG_ON(intel_ring_direction(ring, rq->wa_tail, rq->head) <= 0);
+}
+
+/*
+ * Reserve space for 2 NOOPs at the end of each request to be
+ * used as a workaround for not being allowed to do lite
+ * restore with HEAD==TAIL (WaIdleLiteRestore).
+ */
+static u32 *gen8_emit_wa_tail(struct i915_request *rq, u32 *cs)
+{
+	/* Ensure there's always at least one preemption point per-request. */
+	*cs++ = MI_ARB_CHECK;
+	*cs++ = MI_NOOP;
+	rq->wa_tail = intel_ring_offset(rq, cs);
+
+	/* Check that entire request is less than half the ring */
+	assert_request_valid(rq);
+
+	return cs;
+}
+
+static u32 *emit_preempt_busywait(struct i915_request *rq, u32 *cs)
+{
+	*cs++ = MI_SEMAPHORE_WAIT |
+		MI_SEMAPHORE_GLOBAL_GTT |
+		MI_SEMAPHORE_POLL |
+		MI_SEMAPHORE_SAD_EQ_SDD;
+	*cs++ = 0;
+	*cs++ = preempt_address(rq->engine);
+	*cs++ = 0;
+
+	return cs;
+}
+
+static __always_inline u32*
+gen8_emit_fini_breadcrumb_tail(struct i915_request *rq, u32 *cs)
+{
+	*cs++ = MI_USER_INTERRUPT;
+
+	*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
+	if (intel_engine_has_semaphores(rq->engine))
+		cs = emit_preempt_busywait(rq, cs);
+
+	rq->tail = intel_ring_offset(rq, cs);
+	assert_ring_tail_valid(rq->ring, rq->tail);
+
+	return gen8_emit_wa_tail(rq, cs);
+}
+
+static u32 *emit_xcs_breadcrumb(struct i915_request *rq, u32 *cs)
+{
+	return gen8_emit_ggtt_write(cs, rq->fence.seqno, hwsp_offset(rq), 0);
+}
+
+u32 *gen8_emit_fini_breadcrumb_xcs(struct i915_request *rq, u32 *cs)
+{
+	return gen8_emit_fini_breadcrumb_tail(rq, emit_xcs_breadcrumb(rq, cs));
+}
+
+u32 *gen8_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs)
+{
+	cs = gen8_emit_pipe_control(cs,
+				    PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
+				    PIPE_CONTROL_DEPTH_CACHE_FLUSH |
+				    PIPE_CONTROL_DC_FLUSH_ENABLE,
+				    0);
+
+	/* XXX flush+write+CS_STALL all in one upsets gem_concurrent_blt:kbl */
+	cs = gen8_emit_ggtt_write_rcs(cs,
+				      rq->fence.seqno,
+				      hwsp_offset(rq),
+				      PIPE_CONTROL_FLUSH_ENABLE |
+				      PIPE_CONTROL_CS_STALL);
+
+	return gen8_emit_fini_breadcrumb_tail(rq, cs);
+}
+
+u32 *gen11_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs)
+{
+	cs = gen8_emit_ggtt_write_rcs(cs,
+				      rq->fence.seqno,
+				      hwsp_offset(rq),
+				      PIPE_CONTROL_CS_STALL |
+				      PIPE_CONTROL_TILE_CACHE_FLUSH |
+				      PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
+				      PIPE_CONTROL_DEPTH_CACHE_FLUSH |
+				      PIPE_CONTROL_DC_FLUSH_ENABLE |
+				      PIPE_CONTROL_FLUSH_ENABLE);
+
+	return gen8_emit_fini_breadcrumb_tail(rq, cs);
+}
+
+/*
+ * Note that the CS instruction pre-parser will not stall on the breadcrumb
+ * flush and will continue pre-fetching the instructions after it before the
+ * memory sync is completed. On pre-gen12 HW, the pre-parser will stop at
+ * BB_START/END instructions, so, even though we might pre-fetch the pre-amble
+ * of the next request before the memory has been flushed, we're guaranteed that
+ * we won't access the batch itself too early.
+ * However, on gen12+ the parser can pre-fetch across the BB_START/END commands,
+ * so, if the current request is modifying an instruction in the next request on
+ * the same intel_context, we might pre-fetch and then execute the pre-update
+ * instruction. To avoid this, the users of self-modifying code should either
+ * disable the parser around the code emitting the memory writes, via a new flag
+ * added to MI_ARB_CHECK, or emit the writes from a different intel_context. For
+ * the in-kernel use-cases we've opted to use a separate context, see
+ * reloc_gpu() as an example.
+ * All the above applies only to the instructions themselves. Non-inline data
+ * used by the instructions is not pre-fetched.
+ */
+
+static u32 *gen12_emit_preempt_busywait(struct i915_request *rq, u32 *cs)
+{
+	*cs++ = MI_SEMAPHORE_WAIT_TOKEN |
+		MI_SEMAPHORE_GLOBAL_GTT |
+		MI_SEMAPHORE_POLL |
+		MI_SEMAPHORE_SAD_EQ_SDD;
+	*cs++ = 0;
+	*cs++ = preempt_address(rq->engine);
+	*cs++ = 0;
+	*cs++ = 0;
+	*cs++ = MI_NOOP;
+
+	return cs;
+}
+
+static __always_inline u32*
+gen12_emit_fini_breadcrumb_tail(struct i915_request *rq, u32 *cs)
+{
+	*cs++ = MI_USER_INTERRUPT;
+
+	*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
+	if (intel_engine_has_semaphores(rq->engine))
+		cs = gen12_emit_preempt_busywait(rq, cs);
+
+	rq->tail = intel_ring_offset(rq, cs);
+	assert_ring_tail_valid(rq->ring, rq->tail);
+
+	return gen8_emit_wa_tail(rq, cs);
+}
+
+u32 *gen12_emit_fini_breadcrumb_xcs(struct i915_request *rq, u32 *cs)
+{
+	/* XXX Stalling flush before seqno write; post-sync not */
+	cs = emit_xcs_breadcrumb(rq, __gen8_emit_flush_dw(cs, 0, 0, 0));
+	return gen12_emit_fini_breadcrumb_tail(rq, cs);
+}
+
+u32 *gen12_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs)
+{
+	cs = gen12_emit_ggtt_write_rcs(cs,
+				       rq->fence.seqno,
+				       hwsp_offset(rq),
+				       PIPE_CONTROL0_HDC_PIPELINE_FLUSH,
+				       PIPE_CONTROL_CS_STALL |
+				       PIPE_CONTROL_TILE_CACHE_FLUSH |
+				       PIPE_CONTROL_FLUSH_L3 |
+				       PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
+				       PIPE_CONTROL_DEPTH_CACHE_FLUSH |
+				       /* Wa_1409600907:tgl */
+				       PIPE_CONTROL_DEPTH_STALL |
+				       PIPE_CONTROL_DC_FLUSH_ENABLE |
+				       PIPE_CONTROL_FLUSH_ENABLE);
+
+	return gen12_emit_fini_breadcrumb_tail(rq, cs);
+}
diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.h b/drivers/gpu/drm/i915/gt/gen8_engine_cs.h
new file mode 100644
index 000000000000..3c5771fea235
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2014 Intel Corporation
+ */
+
+#ifndef __GEN8_ENGINE_CS_H__
+#define __GEN8_ENGINE_CS_H__
+
+#include <linux/types.h>
+
+struct i915_request;
+
+int gen8_emit_flush_rcs(struct i915_request *rq, u32 mode);
+int gen11_emit_flush_rcs(struct i915_request *rq, u32 mode);
+int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode);
+
+int gen8_emit_flush_xcs(struct i915_request *rq, u32 mode);
+int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode);
+
+int gen8_emit_init_breadcrumb(struct i915_request *rq);
+
+int gen8_emit_bb_start_noarb(struct i915_request *rq,
+			     u64 offset, u32 len,
+			     const unsigned int flags);
+int gen8_emit_bb_start(struct i915_request *rq,
+		       u64 offset, u32 len,
+		       const unsigned int flags);
+
+u32 *gen8_emit_fini_breadcrumb_xcs(struct i915_request *rq, u32 *cs);
+u32 *gen12_emit_fini_breadcrumb_xcs(struct i915_request *rq, u32 *cs);
+
+u32 *gen8_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs);
+u32 *gen11_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs);
+u32 *gen12_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs);
+
+#endif /* __GEN8_ENGINE_CS_H__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index e1d35ab17e6f..dcecc2887891 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -112,6 +112,7 @@
 #include "i915_perf.h"
 #include "i915_trace.h"
 #include "i915_vgpu.h"
+#include "gen8_engine_cs.h"
 #include "intel_breadcrumbs.h"
 #include "intel_context.h"
 #include "intel_engine_pm.h"
@@ -362,12 +363,6 @@ active_request(const struct intel_timeline * const tl, struct i915_request *rq)
 	return active;
 }
 
-static inline u32 intel_hws_preempt_address(struct intel_engine_cs *engine)
-{
-	return (i915_ggtt_offset(engine->status_page.vma) +
-		I915_GEM_HWS_PREEMPT_ADDR);
-}
-
 static inline void
 ring_set_paused(const struct intel_engine_cs *engine, int state)
 {
@@ -3571,55 +3566,6 @@ static const struct intel_context_ops execlists_context_ops = {
 	.destroy = execlists_context_destroy,
 };
 
-static u32 hwsp_offset(const struct i915_request *rq)
-{
-	const struct intel_timeline_cacheline *cl;
-
-	/* Before the request is executed, the timeline/cachline is fixed */
-
-	cl = rcu_dereference_protected(rq->hwsp_cacheline, 1);
-	if (cl)
-		return cl->ggtt_offset;
-
-	return rcu_dereference_protected(rq->timeline, 1)->hwsp_offset;
-}
-
-static int gen8_emit_init_breadcrumb(struct i915_request *rq)
-{
-	u32 *cs;
-
-	GEM_BUG_ON(i915_request_has_initial_breadcrumb(rq));
-	if (!i915_request_timeline(rq)->has_initial_breadcrumb)
-		return 0;
-
-	cs = intel_ring_begin(rq, 6);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	/*
-	 * Check if we have been preempted before we even get started.
-	 *
-	 * After this point i915_request_started() reports true, even if
-	 * we get preempted and so are no longer running.
-	 */
-	*cs++ = MI_ARB_CHECK;
-	*cs++ = MI_NOOP;
-
-	*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
-	*cs++ = hwsp_offset(rq);
-	*cs++ = 0;
-	*cs++ = rq->fence.seqno - 1;
-
-	intel_ring_advance(rq, cs);
-
-	/* Record the updated position of the request's payload */
-	rq->infix = intel_ring_offset(rq, cs);
-
-	__set_bit(I915_FENCE_FLAG_INITIAL_BREADCRUMB, &rq->fence.flags);
-
-	return 0;
-}
-
 static int emit_pdps(struct i915_request *rq)
 {
 	const struct intel_engine_cs * const engine = rq->engine;
@@ -4475,67 +4421,6 @@ static void execlists_reset_finish(struct intel_engine_cs *engine)
 		     atomic_read(&execlists->tasklet.count));
 }
 
-static int gen8_emit_bb_start_noarb(struct i915_request *rq,
-				    u64 offset, u32 len,
-				    const unsigned int flags)
-{
-	u32 *cs;
-
-	cs = intel_ring_begin(rq, 4);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	/*
-	 * WaDisableCtxRestoreArbitration:bdw,chv
-	 *
-	 * We don't need to perform MI_ARB_ENABLE as often as we do (in
-	 * particular all the gen that do not need the w/a at all!), if we
-	 * took care to make sure that on every switch into this context
-	 * (both ordinary and for preemption) that arbitrartion was enabled
-	 * we would be fine.  However, for gen8 there is another w/a that
-	 * requires us to not preempt inside GPGPU execution, so we keep
-	 * arbitration disabled for gen8 batches. Arbitration will be
-	 * re-enabled before we close the request
-	 * (engine->emit_fini_breadcrumb).
-	 */
-	*cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
-
-	/* FIXME(BDW+): Address space and security selectors. */
-	*cs++ = MI_BATCH_BUFFER_START_GEN8 |
-		(flags & I915_DISPATCH_SECURE ? 0 : BIT(8));
-	*cs++ = lower_32_bits(offset);
-	*cs++ = upper_32_bits(offset);
-
-	intel_ring_advance(rq, cs);
-
-	return 0;
-}
-
-static int gen8_emit_bb_start(struct i915_request *rq,
-			      u64 offset, u32 len,
-			      const unsigned int flags)
-{
-	u32 *cs;
-
-	cs = intel_ring_begin(rq, 6);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
-
-	*cs++ = MI_BATCH_BUFFER_START_GEN8 |
-		(flags & I915_DISPATCH_SECURE ? 0 : BIT(8));
-	*cs++ = lower_32_bits(offset);
-	*cs++ = upper_32_bits(offset);
-
-	*cs++ = MI_ARB_ON_OFF | MI_ARB_DISABLE;
-	*cs++ = MI_NOOP;
-
-	intel_ring_advance(rq, cs);
-
-	return 0;
-}
-
 static void gen8_logical_ring_enable_irq(struct intel_engine_cs *engine)
 {
 	ENGINE_WRITE(engine, RING_IMR,
@@ -4548,504 +4433,6 @@ static void gen8_logical_ring_disable_irq(struct intel_engine_cs *engine)
 	ENGINE_WRITE(engine, RING_IMR, ~engine->irq_keep_mask);
 }
 
-static int gen8_emit_flush(struct i915_request *request, u32 mode)
-{
-	u32 cmd, *cs;
-
-	cs = intel_ring_begin(request, 4);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	cmd = MI_FLUSH_DW + 1;
-
-	/* We always require a command barrier so that subsequent
-	 * commands, such as breadcrumb interrupts, are strictly ordered
-	 * wrt the contents of the write cache being flushed to memory
-	 * (and thus being coherent from the CPU).
-	 */
-	cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
-
-	if (mode & EMIT_INVALIDATE) {
-		cmd |= MI_INVALIDATE_TLB;
-		if (request->engine->class == VIDEO_DECODE_CLASS)
-			cmd |= MI_INVALIDATE_BSD;
-	}
-
-	*cs++ = cmd;
-	*cs++ = LRC_PPHWSP_SCRATCH_ADDR;
-	*cs++ = 0; /* upper addr */
-	*cs++ = 0; /* value */
-	intel_ring_advance(request, cs);
-
-	return 0;
-}
-
-static int gen8_emit_flush_render(struct i915_request *request,
-				  u32 mode)
-{
-	bool vf_flush_wa = false, dc_flush_wa = false;
-	u32 *cs, flags = 0;
-	int len;
-
-	flags |= PIPE_CONTROL_CS_STALL;
-
-	if (mode & EMIT_FLUSH) {
-		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
-		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
-		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
-		flags |= PIPE_CONTROL_FLUSH_ENABLE;
-	}
-
-	if (mode & EMIT_INVALIDATE) {
-		flags |= PIPE_CONTROL_TLB_INVALIDATE;
-		flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_QW_WRITE;
-		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
-
-		/*
-		 * On GEN9: before VF_CACHE_INVALIDATE we need to emit a NULL
-		 * pipe control.
-		 */
-		if (IS_GEN(request->engine->i915, 9))
-			vf_flush_wa = true;
-
-		/* WaForGAMHang:kbl */
-		if (IS_KBL_GT_REVID(request->engine->i915, 0, KBL_REVID_B0))
-			dc_flush_wa = true;
-	}
-
-	len = 6;
-
-	if (vf_flush_wa)
-		len += 6;
-
-	if (dc_flush_wa)
-		len += 12;
-
-	cs = intel_ring_begin(request, len);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	if (vf_flush_wa)
-		cs = gen8_emit_pipe_control(cs, 0, 0);
-
-	if (dc_flush_wa)
-		cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_DC_FLUSH_ENABLE,
-					    0);
-
-	cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
-
-	if (dc_flush_wa)
-		cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_CS_STALL, 0);
-
-	intel_ring_advance(request, cs);
-
-	return 0;
-}
-
-static int gen11_emit_flush_render(struct i915_request *request,
-				   u32 mode)
-{
-	if (mode & EMIT_FLUSH) {
-		u32 *cs;
-		u32 flags = 0;
-
-		flags |= PIPE_CONTROL_CS_STALL;
-
-		flags |= PIPE_CONTROL_TILE_CACHE_FLUSH;
-		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
-		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
-		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
-		flags |= PIPE_CONTROL_FLUSH_ENABLE;
-		flags |= PIPE_CONTROL_QW_WRITE;
-		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
-
-		cs = intel_ring_begin(request, 6);
-		if (IS_ERR(cs))
-			return PTR_ERR(cs);
-
-		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
-		intel_ring_advance(request, cs);
-	}
-
-	if (mode & EMIT_INVALIDATE) {
-		u32 *cs;
-		u32 flags = 0;
-
-		flags |= PIPE_CONTROL_CS_STALL;
-
-		flags |= PIPE_CONTROL_COMMAND_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_TLB_INVALIDATE;
-		flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_QW_WRITE;
-		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
-
-		cs = intel_ring_begin(request, 6);
-		if (IS_ERR(cs))
-			return PTR_ERR(cs);
-
-		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
-		intel_ring_advance(request, cs);
-	}
-
-	return 0;
-}
-
-static u32 preparser_disable(bool state)
-{
-	return MI_ARB_CHECK | 1 << 8 | state;
-}
-
-static i915_reg_t aux_inv_reg(const struct intel_engine_cs *engine)
-{
-	static const i915_reg_t vd[] = {
-		GEN12_VD0_AUX_NV,
-		GEN12_VD1_AUX_NV,
-		GEN12_VD2_AUX_NV,
-		GEN12_VD3_AUX_NV,
-	};
-
-	static const i915_reg_t ve[] = {
-		GEN12_VE0_AUX_NV,
-		GEN12_VE1_AUX_NV,
-	};
-
-	if (engine->class == VIDEO_DECODE_CLASS)
-		return vd[engine->instance];
-
-	if (engine->class == VIDEO_ENHANCEMENT_CLASS)
-		return ve[engine->instance];
-
-	GEM_BUG_ON("unknown aux_inv_reg\n");
-
-	return INVALID_MMIO_REG;
-}
-
-static u32 *
-gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs)
-{
-	*cs++ = MI_LOAD_REGISTER_IMM(1);
-	*cs++ = i915_mmio_reg_offset(inv_reg);
-	*cs++ = AUX_INV;
-	*cs++ = MI_NOOP;
-
-	return cs;
-}
-
-static int gen12_emit_flush_render(struct i915_request *request,
-				   u32 mode)
-{
-	if (mode & EMIT_FLUSH) {
-		u32 flags = 0;
-		u32 *cs;
-
-		flags |= PIPE_CONTROL_TILE_CACHE_FLUSH;
-		flags |= PIPE_CONTROL_FLUSH_L3;
-		flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
-		flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
-		/* Wa_1409600907:tgl */
-		flags |= PIPE_CONTROL_DEPTH_STALL;
-		flags |= PIPE_CONTROL_DC_FLUSH_ENABLE;
-		flags |= PIPE_CONTROL_FLUSH_ENABLE;
-
-		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
-		flags |= PIPE_CONTROL_QW_WRITE;
-
-		flags |= PIPE_CONTROL_CS_STALL;
-
-		cs = intel_ring_begin(request, 6);
-		if (IS_ERR(cs))
-			return PTR_ERR(cs);
-
-		cs = gen12_emit_pipe_control(cs,
-					     PIPE_CONTROL0_HDC_PIPELINE_FLUSH,
-					     flags, LRC_PPHWSP_SCRATCH_ADDR);
-		intel_ring_advance(request, cs);
-	}
-
-	if (mode & EMIT_INVALIDATE) {
-		u32 flags = 0;
-		u32 *cs;
-
-		flags |= PIPE_CONTROL_COMMAND_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_TLB_INVALIDATE;
-		flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE;
-		flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE;
-
-		flags |= PIPE_CONTROL_STORE_DATA_INDEX;
-		flags |= PIPE_CONTROL_QW_WRITE;
-
-		flags |= PIPE_CONTROL_CS_STALL;
-
-		cs = intel_ring_begin(request, 8 + 4);
-		if (IS_ERR(cs))
-			return PTR_ERR(cs);
-
-		/*
-		 * Prevent the pre-parser from skipping past the TLB
-		 * invalidate and loading a stale page for the batch
-		 * buffer / request payload.
-		 */
-		*cs++ = preparser_disable(true);
-
-		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
-
-		/* hsdes: 1809175790 */
-		cs = gen12_emit_aux_table_inv(GEN12_GFX_CCS_AUX_NV, cs);
-
-		*cs++ = preparser_disable(false);
-		intel_ring_advance(request, cs);
-	}
-
-	return 0;
-}
-
-static int gen12_emit_flush(struct i915_request *request, u32 mode)
-{
-	intel_engine_mask_t aux_inv = 0;
-	u32 cmd, *cs;
-
-	cmd = 4;
-	if (mode & EMIT_INVALIDATE)
-		cmd += 2;
-	if (mode & EMIT_INVALIDATE)
-		aux_inv = request->engine->mask & ~BIT(BCS0);
-	if (aux_inv)
-		cmd += 2 * hweight8(aux_inv) + 2;
-
-	cs = intel_ring_begin(request, cmd);
-	if (IS_ERR(cs))
-		return PTR_ERR(cs);
-
-	if (mode & EMIT_INVALIDATE)
-		*cs++ = preparser_disable(true);
-
-	cmd = MI_FLUSH_DW + 1;
-
-	/* We always require a command barrier so that subsequent
-	 * commands, such as breadcrumb interrupts, are strictly ordered
-	 * wrt the contents of the write cache being flushed to memory
-	 * (and thus being coherent from the CPU).
-	 */
-	cmd |= MI_FLUSH_DW_STORE_INDEX | MI_FLUSH_DW_OP_STOREDW;
-
-	if (mode & EMIT_INVALIDATE) {
-		cmd |= MI_INVALIDATE_TLB;
-		if (request->engine->class == VIDEO_DECODE_CLASS)
-			cmd |= MI_INVALIDATE_BSD;
-	}
-
-	*cs++ = cmd;
-	*cs++ = LRC_PPHWSP_SCRATCH_ADDR;
-	*cs++ = 0; /* upper addr */
-	*cs++ = 0; /* value */
-
-	if (aux_inv) { /* hsdes: 1809175790 */
-		struct intel_engine_cs *engine;
-		unsigned int tmp;
-
-		*cs++ = MI_LOAD_REGISTER_IMM(hweight8(aux_inv));
-		for_each_engine_masked(engine, request->engine->gt,
-				       aux_inv, tmp) {
-			*cs++ = i915_mmio_reg_offset(aux_inv_reg(engine));
-			*cs++ = AUX_INV;
-		}
-		*cs++ = MI_NOOP;
-	}
-
-	if (mode & EMIT_INVALIDATE)
-		*cs++ = preparser_disable(false);
-
-	intel_ring_advance(request, cs);
-
-	return 0;
-}
-
-static void assert_request_valid(struct i915_request *rq)
-{
-	struct intel_ring *ring __maybe_unused = rq->ring;
-
-	/* Can we unwind this request without appearing to go forwards? */
-	GEM_BUG_ON(intel_ring_direction(ring, rq->wa_tail, rq->head) <= 0);
-}
-
-/*
- * Reserve space for 2 NOOPs at the end of each request to be
- * used as a workaround for not being allowed to do lite
- * restore with HEAD==TAIL (WaIdleLiteRestore).
- */
-static u32 *gen8_emit_wa_tail(struct i915_request *request, u32 *cs)
-{
-	/* Ensure there's always at least one preemption point per-request. */
-	*cs++ = MI_ARB_CHECK;
-	*cs++ = MI_NOOP;
-	request->wa_tail = intel_ring_offset(request, cs);
-
-	/* Check that entire request is less than half the ring */
-	assert_request_valid(request);
-
-	return cs;
-}
-
-static u32 *emit_preempt_busywait(struct i915_request *request, u32 *cs)
-{
-	*cs++ = MI_SEMAPHORE_WAIT |
-		MI_SEMAPHORE_GLOBAL_GTT |
-		MI_SEMAPHORE_POLL |
-		MI_SEMAPHORE_SAD_EQ_SDD;
-	*cs++ = 0;
-	*cs++ = intel_hws_preempt_address(request->engine);
-	*cs++ = 0;
-
-	return cs;
-}
-
-static __always_inline u32*
-gen8_emit_fini_breadcrumb_tail(struct i915_request *request, u32 *cs)
-{
-	*cs++ = MI_USER_INTERRUPT;
-
-	*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
-	if (intel_engine_has_semaphores(request->engine))
-		cs = emit_preempt_busywait(request, cs);
-
-	request->tail = intel_ring_offset(request, cs);
-	assert_ring_tail_valid(request->ring, request->tail);
-
-	return gen8_emit_wa_tail(request, cs);
-}
-
-static u32 *emit_xcs_breadcrumb(struct i915_request *rq, u32 *cs)
-{
-	return gen8_emit_ggtt_write(cs, rq->fence.seqno, hwsp_offset(rq), 0);
-}
-
-static u32 *gen8_emit_fini_breadcrumb(struct i915_request *rq, u32 *cs)
-{
-	return gen8_emit_fini_breadcrumb_tail(rq, emit_xcs_breadcrumb(rq, cs));
-}
-
-static u32 *gen8_emit_fini_breadcrumb_rcs(struct i915_request *request, u32 *cs)
-{
-	cs = gen8_emit_pipe_control(cs,
-				    PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
-				    PIPE_CONTROL_DEPTH_CACHE_FLUSH |
-				    PIPE_CONTROL_DC_FLUSH_ENABLE,
-				    0);
-
-	/* XXX flush+write+CS_STALL all in one upsets gem_concurrent_blt:kbl */
-	cs = gen8_emit_ggtt_write_rcs(cs,
-				      request->fence.seqno,
-				      hwsp_offset(request),
-				      PIPE_CONTROL_FLUSH_ENABLE |
-				      PIPE_CONTROL_CS_STALL);
-
-	return gen8_emit_fini_breadcrumb_tail(request, cs);
-}
-
-static u32 *
-gen11_emit_fini_breadcrumb_rcs(struct i915_request *request, u32 *cs)
-{
-	cs = gen8_emit_ggtt_write_rcs(cs,
-				      request->fence.seqno,
-				      hwsp_offset(request),
-				      PIPE_CONTROL_CS_STALL |
-				      PIPE_CONTROL_TILE_CACHE_FLUSH |
-				      PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
-				      PIPE_CONTROL_DEPTH_CACHE_FLUSH |
-				      PIPE_CONTROL_DC_FLUSH_ENABLE |
-				      PIPE_CONTROL_FLUSH_ENABLE);
-
-	return gen8_emit_fini_breadcrumb_tail(request, cs);
-}
-
-/*
- * Note that the CS instruction pre-parser will not stall on the breadcrumb
- * flush and will continue pre-fetching the instructions after it before the
- * memory sync is completed. On pre-gen12 HW, the pre-parser will stop at
- * BB_START/END instructions, so, even though we might pre-fetch the pre-amble
- * of the next request before the memory has been flushed, we're guaranteed that
- * we won't access the batch itself too early.
- * However, on gen12+ the parser can pre-fetch across the BB_START/END commands,
- * so, if the current request is modifying an instruction in the next request on
- * the same intel_context, we might pre-fetch and then execute the pre-update
- * instruction. To avoid this, the users of self-modifying code should either
- * disable the parser around the code emitting the memory writes, via a new flag
- * added to MI_ARB_CHECK, or emit the writes from a different intel_context. For
- * the in-kernel use-cases we've opted to use a separate context, see
- * reloc_gpu() as an example.
- * All the above applies only to the instructions themselves. Non-inline data
- * used by the instructions is not pre-fetched.
- */
-
-static u32 *gen12_emit_preempt_busywait(struct i915_request *request, u32 *cs)
-{
-	*cs++ = MI_SEMAPHORE_WAIT_TOKEN |
-		MI_SEMAPHORE_GLOBAL_GTT |
-		MI_SEMAPHORE_POLL |
-		MI_SEMAPHORE_SAD_EQ_SDD;
-	*cs++ = 0;
-	*cs++ = intel_hws_preempt_address(request->engine);
-	*cs++ = 0;
-	*cs++ = 0;
-	*cs++ = MI_NOOP;
-
-	return cs;
-}
-
-static __always_inline u32*
-gen12_emit_fini_breadcrumb_tail(struct i915_request *request, u32 *cs)
-{
-	*cs++ = MI_USER_INTERRUPT;
-
-	*cs++ = MI_ARB_ON_OFF | MI_ARB_ENABLE;
-	if (intel_engine_has_semaphores(request->engine))
-		cs = gen12_emit_preempt_busywait(request, cs);
-
-	request->tail = intel_ring_offset(request, cs);
-	assert_ring_tail_valid(request->ring, request->tail);
-
-	return gen8_emit_wa_tail(request, cs);
-}
-
-static u32 *gen12_emit_fini_breadcrumb(struct i915_request *rq, u32 *cs)
-{
-	/* XXX Stalling flush before seqno write; post-sync not */
-	cs = emit_xcs_breadcrumb(rq, __gen8_emit_flush_dw(cs, 0, 0, 0));
-	return gen12_emit_fini_breadcrumb_tail(rq, cs);
-}
-
-static u32 *
-gen12_emit_fini_breadcrumb_rcs(struct i915_request *request, u32 *cs)
-{
-	cs = gen12_emit_ggtt_write_rcs(cs,
-				       request->fence.seqno,
-				       hwsp_offset(request),
-				       PIPE_CONTROL0_HDC_PIPELINE_FLUSH,
-				       PIPE_CONTROL_CS_STALL |
-				       PIPE_CONTROL_TILE_CACHE_FLUSH |
-				       PIPE_CONTROL_FLUSH_L3 |
-				       PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
-				       PIPE_CONTROL_DEPTH_CACHE_FLUSH |
-				       /* Wa_1409600907:tgl */
-				       PIPE_CONTROL_DEPTH_STALL |
-				       PIPE_CONTROL_DC_FLUSH_ENABLE |
-				       PIPE_CONTROL_FLUSH_ENABLE);
-
-	return gen12_emit_fini_breadcrumb_tail(request, cs);
-}
-
 static void execlists_park(struct intel_engine_cs *engine)
 {
 	cancel_timer(&engine->execlists.timer);
@@ -5113,12 +4500,12 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
 	engine->cops = &execlists_context_ops;
 	engine->request_alloc = execlists_request_alloc;
 
-	engine->emit_flush = gen8_emit_flush;
+	engine->emit_flush = gen8_emit_flush_xcs;
 	engine->emit_init_breadcrumb = gen8_emit_init_breadcrumb;
-	engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb;
+	engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb_xcs;
 	if (INTEL_GEN(engine->i915) >= 12) {
-		engine->emit_fini_breadcrumb = gen12_emit_fini_breadcrumb;
-		engine->emit_flush = gen12_emit_flush;
+		engine->emit_fini_breadcrumb = gen12_emit_fini_breadcrumb_xcs;
+		engine->emit_flush = gen12_emit_flush_xcs;
 	}
 	engine->set_default_submission = intel_execlists_set_default_submission;
 
@@ -5162,15 +4549,15 @@ static void rcs_submission_override(struct intel_engine_cs *engine)
 {
 	switch (INTEL_GEN(engine->i915)) {
 	case 12:
-		engine->emit_flush = gen12_emit_flush_render;
+		engine->emit_flush = gen12_emit_flush_rcs;
 		engine->emit_fini_breadcrumb = gen12_emit_fini_breadcrumb_rcs;
 		break;
 	case 11:
-		engine->emit_flush = gen11_emit_flush_render;
+		engine->emit_flush = gen11_emit_flush_rcs;
 		engine->emit_fini_breadcrumb = gen11_emit_fini_breadcrumb_rcs;
 		break;
 	default:
-		engine->emit_flush = gen8_emit_flush_render;
+		engine->emit_flush = gen8_emit_flush_rcs;
 		engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb_rcs;
 		break;
 	}
-- 
2.20.1

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