On Tigerlake, MI_SEMAPHORE_WAIT grew an extra dword, so be sure to
update the length field and emit that extra parameter and any padding
noop as required.

v2: Define the token shift while we are adding the updated MI_SEMAPHORE_WAIT
v3: Use int instead of bool in the addition so that readers are not left
wondering about the intricacies of the C spec. Now they just have to
worry what the integer value of a boolean operation is...

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
Cc: Michal Winiarski <michal.winiar...@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gpu_commands.h |  3 +
 drivers/gpu/drm/i915/gt/intel_lrc.c          | 71 ++++++++++++++++++--
 drivers/gpu/drm/i915/i915_pci.c              |  1 -
 drivers/gpu/drm/i915/i915_request.c          | 21 ++++--
 4 files changed, 84 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h 
b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
index fbad403ab7ac..f78b13d74e17 100644
--- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
+++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h
@@ -112,6 +112,7 @@
 #define MI_SEMAPHORE_SIGNAL    MI_INSTR(0x1b, 0) /* GEN8+ */
 #define   MI_SEMAPHORE_TARGET(engine)  ((engine)<<15)
 #define MI_SEMAPHORE_WAIT      MI_INSTR(0x1c, 2) /* GEN8+ */
+#define MI_SEMAPHORE_WAIT_TOKEN        MI_INSTR(0x1c, 3) /* GEN12+ */
 #define   MI_SEMAPHORE_POLL            (1 << 15)
 #define   MI_SEMAPHORE_SAD_GT_SDD      (0 << 12)
 #define   MI_SEMAPHORE_SAD_GTE_SDD     (1 << 12)
@@ -119,6 +120,8 @@
 #define   MI_SEMAPHORE_SAD_LTE_SDD     (3 << 12)
 #define   MI_SEMAPHORE_SAD_EQ_SDD      (4 << 12)
 #define   MI_SEMAPHORE_SAD_NEQ_SDD     (5 << 12)
+#define   MI_SEMAPHORE_TOKEN_MASK      REG_GENMASK(9, 5)
+#define   MI_SEMAPHORE_TOKEN_SHIFT     5
 #define MI_STORE_DWORD_IMM     MI_INSTR(0x20, 1)
 #define MI_STORE_DWORD_IMM_GEN4        MI_INSTR(0x20, 2)
 #define   MI_MEM_VIRTUAL       (1 << 22) /* 945,g33,965 */
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c 
b/drivers/gpu/drm/i915/gt/intel_lrc.c
index a3f0e4999744..a99166a2d2eb 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2879,6 +2879,22 @@ static u32 *gen8_emit_fini_breadcrumb_rcs(struct 
i915_request *request, u32 *cs)
        return gen8_emit_fini_breadcrumb_footer(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,
+                                     request->timeline->hwsp_offset,
+                                     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_footer(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
@@ -2897,8 +2913,49 @@ static u32 *gen8_emit_fini_breadcrumb_rcs(struct 
i915_request *request, u32 *cs)
  * All the above applies only to the instructions themselves. Non-inline data
  * used by the instructions is not pre-fetched.
  */
-static u32 *gen11_emit_fini_breadcrumb_rcs(struct i915_request *request,
-                                          u32 *cs)
+
+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_footer(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 *request, u32 *cs)
+{
+       cs = gen8_emit_ggtt_write(cs,
+                                 request->fence.seqno,
+                                 request->timeline->hwsp_offset,
+                                 0);
+
+       return gen12_emit_fini_breadcrumb_footer(request, cs);
+}
+
+static u32 *
+gen12_emit_fini_breadcrumb_rcs(struct i915_request *request, u32 *cs)
 {
        cs = gen8_emit_ggtt_write_rcs(cs,
                                      request->fence.seqno,
@@ -2910,7 +2967,7 @@ static u32 *gen11_emit_fini_breadcrumb_rcs(struct 
i915_request *request,
                                      PIPE_CONTROL_DC_FLUSH_ENABLE |
                                      PIPE_CONTROL_FLUSH_ENABLE);
 
-       return gen8_emit_fini_breadcrumb_footer(request, cs);
+       return gen12_emit_fini_breadcrumb_footer(request, cs);
 }
 
 static void execlists_park(struct intel_engine_cs *engine)
@@ -2939,9 +2996,6 @@ void intel_execlists_set_default_submission(struct 
intel_engine_cs *engine)
                        engine->flags |= I915_ENGINE_HAS_PREEMPTION;
        }
 
-       if (INTEL_GEN(engine->i915) >= 12) /* XXX disabled for debugging */
-               engine->flags &= ~I915_ENGINE_HAS_SEMAPHORES;
-
        if (engine->class != COPY_ENGINE_CLASS && INTEL_GEN(engine->i915) >= 12)
                engine->flags |= I915_ENGINE_HAS_RELATIVE_MMIO;
 }
@@ -2971,6 +3025,8 @@ logical_ring_default_vfuncs(struct intel_engine_cs 
*engine)
        engine->emit_flush = gen8_emit_flush;
        engine->emit_init_breadcrumb = gen8_emit_init_breadcrumb;
        engine->emit_fini_breadcrumb = gen8_emit_fini_breadcrumb;
+       if (INTEL_GEN(engine->i915) >= 12)
+               engine->emit_fini_breadcrumb = gen12_emit_fini_breadcrumb;
 
        engine->set_default_submission = intel_execlists_set_default_submission;
 
@@ -3016,6 +3072,9 @@ static void rcs_submission_override(struct 
intel_engine_cs *engine)
 {
        switch (INTEL_GEN(engine->i915)) {
        case 12:
+               engine->emit_flush = gen11_emit_flush_render;
+               engine->emit_fini_breadcrumb = gen12_emit_fini_breadcrumb_rcs;
+               break;
        case 11:
                engine->emit_flush = gen11_emit_flush_render;
                engine->emit_fini_breadcrumb = gen11_emit_fini_breadcrumb_rcs;
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index e4a26bbd8788..fe6941c8fc99 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -797,7 +797,6 @@ static const struct intel_device_info 
intel_tigerlake_12_info = {
        .display.has_modular_fia = 1,
        .engine_mask =
                BIT(RCS0) | BIT(BCS0) | BIT(VECS0) | BIT(VCS0) | BIT(VCS2),
-       .has_logical_ring_preemption = false, /* XXX disabled for debugging */
        .engine_mask = BIT(RCS0), /* XXX reduced for debugging */
 };
 
diff --git a/drivers/gpu/drm/i915/i915_request.c 
b/drivers/gpu/drm/i915/i915_request.c
index 754a78364a63..3ecf92aa5fc1 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -783,7 +783,9 @@ emit_semaphore_wait(struct i915_request *to,
                    struct i915_request *from,
                    gfp_t gfp)
 {
+       const int has_token = INTEL_GEN(to->i915) >= 12;
        u32 hwsp_offset;
+       int len;
        u32 *cs;
        int err;
 
@@ -810,7 +812,11 @@ emit_semaphore_wait(struct i915_request *to,
        if (err)
                return err;
 
-       cs = intel_ring_begin(to, 4);
+       len = 4;
+       if (has_token)
+               len += 2;
+
+       cs = intel_ring_begin(to, len);
        if (IS_ERR(cs))
                return PTR_ERR(cs);
 
@@ -822,13 +828,18 @@ emit_semaphore_wait(struct i915_request *to,
         * (post-wrap) values than they were expecting (and so wait
         * forever).
         */
-       *cs++ = MI_SEMAPHORE_WAIT |
-               MI_SEMAPHORE_GLOBAL_GTT |
-               MI_SEMAPHORE_POLL |
-               MI_SEMAPHORE_SAD_GTE_SDD;
+       *cs++ = (MI_SEMAPHORE_WAIT |
+                MI_SEMAPHORE_GLOBAL_GTT |
+                MI_SEMAPHORE_POLL |
+                MI_SEMAPHORE_SAD_GTE_SDD) +
+               has_token;
        *cs++ = from->fence.seqno;
        *cs++ = hwsp_offset;
        *cs++ = 0;
+       if (has_token) {
+               *cs++ = 0;
+               *cs++ = MI_NOOP;
+       }
 
        intel_ring_advance(to, cs);
        to->sched.semaphores |= from->engine->mask;
-- 
2.23.0

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