drm/i915/reset: Add additional steps for Wa_22011802037 for execlist backend

For execlists backend, current implementation of Wa_22011802037 is to
stop the CS before doing a reset of the engine. This WA was further
extended to wait for any pending MI FORCE WAKEUPs before issuing a
reset. Add the extended steps in the execlist path of reset.

In addition, extend the WA to gen11.

v2: (Tvrtko)
- Clarify comments, commit message, fix typos
- Use IS_GRAPHICS_VER for gen 11/12 checks

v3: (Daneile)
- Drop changes to intel_ring_submission since WA does not apply to it
- Log an error if MSG IDLE is not defined for an engine
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Fixes: f6aa0d71 ("drm/i915: Add Wa_22011802037 force cs halt")
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220621192105.2100585-1-umesh.nerlige.ramappa@intel.com

drivers/gpu/drm/i915/gt/intel_engine.h

@@ -201,6 +201,8 @@ int intel_ring_submission_setup(struct intel_engine_cs *engine);
 int intel_engine_stop_cs(struct intel_engine_cs *engine);
 void intel_engine_cancel_stop_cs(struct intel_engine_cs *engine);
 
+void intel_engine_wait_for_pending_mi_fw(struct intel_engine_cs *engine);
+
 void intel_engine_set_hwsp_writemask(struct intel_engine_cs *engine, u32 mask);
 
 u64 intel_engine_get_active_head(const struct intel_engine_cs *engine);

drivers/gpu/drm/i915/gt/intel_engine_cs.c

@@ -1376,10 +1376,10 @@ static int __intel_engine_stop_cs(struct intel_engine_cs *engine,
 	intel_uncore_write_fw(uncore, mode, _MASKED_BIT_ENABLE(STOP_RING));
 
 	/*
-	 * Wa_22011802037 : gen12, Prior to doing a reset, ensure CS is
+	 * Wa_22011802037 : gen11, gen12, Prior to doing a reset, ensure CS is
 	 * stopped, set ring stop bit and prefetch disable bit to halt CS
 	 */
-	if (GRAPHICS_VER(engine->i915) == 12)
+	if (IS_GRAPHICS_VER(engine->i915, 11, 12))
 		intel_uncore_write_fw(uncore, RING_MODE_GEN7(engine->mmio_base),
 				      _MASKED_BIT_ENABLE(GEN12_GFX_PREFETCH_DISABLE));
 
@@ -1402,6 +1402,18 @@ int intel_engine_stop_cs(struct intel_engine_cs *engine)
 		return -ENODEV;
 
 	ENGINE_TRACE(engine, "\n");
+	/*
+	 * TODO: Find out why occasionally stopping the CS times out. Seen
+	 * especially with gem_eio tests.
+	 *
+	 * Occasionally trying to stop the cs times out, but does not adversely
+	 * affect functionality. The timeout is set as a config parameter that
+	 * defaults to 100ms. In most cases the follow up operation is to wait
+	 * for pending MI_FORCE_WAKES. The assumption is that this timeout is
+	 * sufficient for any pending MI_FORCEWAKEs to complete. Once root
+	 * caused, the caller must check and handle the return from this
+	 * function.
+	 */
 	if (__intel_engine_stop_cs(engine, 1000, stop_timeout(engine))) {
 		ENGINE_TRACE(engine,
 			     "timed out on STOP_RING -> IDLE; HEAD:%04x, TAIL:%04x\n",
@@ -1428,6 +1440,78 @@ void intel_engine_cancel_stop_cs(struct intel_engine_cs *engine)
 	ENGINE_WRITE_FW(engine, RING_MI_MODE, _MASKED_BIT_DISABLE(STOP_RING));
 }
 
+static u32 __cs_pending_mi_force_wakes(struct intel_engine_cs *engine)
+{
+	static const i915_reg_t _reg[I915_NUM_ENGINES] = {
+		[RCS0] = MSG_IDLE_CS,
+		[BCS0] = MSG_IDLE_BCS,
+		[VCS0] = MSG_IDLE_VCS0,
+		[VCS1] = MSG_IDLE_VCS1,
+		[VCS2] = MSG_IDLE_VCS2,
+		[VCS3] = MSG_IDLE_VCS3,
+		[VCS4] = MSG_IDLE_VCS4,
+		[VCS5] = MSG_IDLE_VCS5,
+		[VCS6] = MSG_IDLE_VCS6,
+		[VCS7] = MSG_IDLE_VCS7,
+		[VECS0] = MSG_IDLE_VECS0,
+		[VECS1] = MSG_IDLE_VECS1,
+		[VECS2] = MSG_IDLE_VECS2,
+		[VECS3] = MSG_IDLE_VECS3,
+		[CCS0] = MSG_IDLE_CS,
+		[CCS1] = MSG_IDLE_CS,
+		[CCS2] = MSG_IDLE_CS,
+		[CCS3] = MSG_IDLE_CS,
+	};
+	u32 val;
+
+	if (!_reg[engine->id].reg) {
+		drm_err(&engine->i915->drm,
+			"MSG IDLE undefined for engine id %u\n", engine->id);
+		return 0;
+	}
+
+	val = intel_uncore_read(engine->uncore, _reg[engine->id]);
+
+	/* bits[29:25] & bits[13:9] >> shift */
+	return (val & (val >> 16) & MSG_IDLE_FW_MASK) >> MSG_IDLE_FW_SHIFT;
+}
+
+static void __gpm_wait_for_fw_complete(struct intel_gt *gt, u32 fw_mask)
+{
+	int ret;
+
+	/* Ensure GPM receives fw up/down after CS is stopped */
+	udelay(1);
+
+	/* Wait for forcewake request to complete in GPM */
+	ret =  __intel_wait_for_register_fw(gt->uncore,
+					    GEN9_PWRGT_DOMAIN_STATUS,
+					    fw_mask, fw_mask, 5000, 0, NULL);
+
+	/* Ensure CS receives fw ack from GPM */
+	udelay(1);
+
+	if (ret)
+		GT_TRACE(gt, "Failed to complete pending forcewake %d\n", ret);
+}
+
+/*
+ * Wa_22011802037:gen12: In addition to stopping the cs, we need to wait for any
+ * pending MI_FORCE_WAKEUP requests that the CS has initiated to complete. The
+ * pending status is indicated by bits[13:9] (masked by bits[29:25]) in the
+ * MSG_IDLE register. There's one MSG_IDLE register per reset domain. Since we
+ * are concerned only with the gt reset here, we use a logical OR of pending
+ * forcewakeups from all reset domains and then wait for them to complete by
+ * querying PWRGT_DOMAIN_STATUS.
+ */
+void intel_engine_wait_for_pending_mi_fw(struct intel_engine_cs *engine)
+{
+	u32 fw_pending = __cs_pending_mi_force_wakes(engine);
+
+	if (fw_pending)
+		__gpm_wait_for_fw_complete(engine->gt, fw_pending);
+}
+
 /* NB: please notice the memset */
 void intel_engine_get_instdone(const struct intel_engine_cs *engine,
 			       struct intel_instdone *instdone)

drivers/gpu/drm/i915/gt/intel_execlists_submission.c

@@ -2968,6 +2968,13 @@ static void execlists_reset_prepare(struct intel_engine_cs *engine)
 	ring_set_paused(engine, 1);
 	intel_engine_stop_cs(engine);
 
+	/*
+	 * Wa_22011802037:gen11/gen12: In addition to stopping the cs, we need
+	 * to wait for any pending mi force wakeups
+	 */
+	if (IS_GRAPHICS_VER(engine->i915, 11, 12))
+		intel_engine_wait_for_pending_mi_fw(engine);
+
 	engine->execlists.reset_ccid = active_ccid(engine);
 }
 

drivers/gpu/drm/i915/gt/uc/intel_guc.c

@@ -310,8 +310,8 @@ static u32 guc_ctl_wa_flags(struct intel_guc *guc)
 	if (IS_DG2(gt->i915))
 		flags |= GUC_WA_DUAL_QUEUE;
 
-	/* Wa_22011802037: graphics version 12 */
-	if (GRAPHICS_VER(gt->i915) == 12)
+	/* Wa_22011802037: graphics version 11/12 */
+	if (IS_GRAPHICS_VER(gt->i915, 11, 12))
 		flags |= GUC_WA_PRE_PARSER;
 
 	/* Wa_16011777198:dg2 */

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

@@ -1540,87 +1540,18 @@ static void guc_reset_state(struct intel_context *ce, u32 head, bool scrub)
 	lrc_update_regs(ce, engine, head);
 }
 
-static u32 __cs_pending_mi_force_wakes(struct intel_engine_cs *engine)
-{
-	static const i915_reg_t _reg[I915_NUM_ENGINES] = {
-		[RCS0] = MSG_IDLE_CS,
-		[BCS0] = MSG_IDLE_BCS,
-		[VCS0] = MSG_IDLE_VCS0,
-		[VCS1] = MSG_IDLE_VCS1,
-		[VCS2] = MSG_IDLE_VCS2,
-		[VCS3] = MSG_IDLE_VCS3,
-		[VCS4] = MSG_IDLE_VCS4,
-		[VCS5] = MSG_IDLE_VCS5,
-		[VCS6] = MSG_IDLE_VCS6,
-		[VCS7] = MSG_IDLE_VCS7,
-		[VECS0] = MSG_IDLE_VECS0,
-		[VECS1] = MSG_IDLE_VECS1,
-		[VECS2] = MSG_IDLE_VECS2,
-		[VECS3] = MSG_IDLE_VECS3,
-		[CCS0] = MSG_IDLE_CS,
-		[CCS1] = MSG_IDLE_CS,
-		[CCS2] = MSG_IDLE_CS,
-		[CCS3] = MSG_IDLE_CS,
-	};
-	u32 val;
-
-	if (!_reg[engine->id].reg)
-		return 0;
-
-	val = intel_uncore_read(engine->uncore, _reg[engine->id]);
-
-	/* bits[29:25] & bits[13:9] >> shift */
-	return (val & (val >> 16) & MSG_IDLE_FW_MASK) >> MSG_IDLE_FW_SHIFT;
-}
-
-static void __gpm_wait_for_fw_complete(struct intel_gt *gt, u32 fw_mask)
-{
-	int ret;
-
-	/* Ensure GPM receives fw up/down after CS is stopped */
-	udelay(1);
-
-	/* Wait for forcewake request to complete in GPM */
-	ret =  __intel_wait_for_register_fw(gt->uncore,
-					    GEN9_PWRGT_DOMAIN_STATUS,
-					    fw_mask, fw_mask, 5000, 0, NULL);
-
-	/* Ensure CS receives fw ack from GPM */
-	udelay(1);
-
-	if (ret)
-		GT_TRACE(gt, "Failed to complete pending forcewake %d\n", ret);
-}
-
-/*
- * Wa_22011802037:gen12: In addition to stopping the cs, we need to wait for any
- * pending MI_FORCE_WAKEUP requests that the CS has initiated to complete. The
- * pending status is indicated by bits[13:9] (masked by bits[ 29:25]) in the
- * MSG_IDLE register. There's one MSG_IDLE register per reset domain. Since we
- * are concerned only with the gt reset here, we use a logical OR of pending
- * forcewakeups from all reset domains and then wait for them to complete by
- * querying PWRGT_DOMAIN_STATUS.
- */
 static void guc_engine_reset_prepare(struct intel_engine_cs *engine)
 {
-	u32 fw_pending;
-
-	if (GRAPHICS_VER(engine->i915) != 12)
+	if (!IS_GRAPHICS_VER(engine->i915, 11, 12))
 		return;
 
-	/*
-	 * Wa_22011802037
-	 * TODO: Occasionally trying to stop the cs times out, but does not
-	 * adversely affect functionality. The timeout is set as a config
-	 * parameter that defaults to 100ms. Assuming that this timeout is
-	 * sufficient for any pending MI_FORCEWAKEs to complete, ignore the
-	 * timeout returned here until it is root caused.
-	 */
 	intel_engine_stop_cs(engine);
 
-	fw_pending = __cs_pending_mi_force_wakes(engine);
-	if (fw_pending)
-		__gpm_wait_for_fw_complete(engine->gt, fw_pending);
+	/*
+	 * Wa_22011802037:gen11/gen12: In addition to stopping the cs, we need
+	 * to wait for any pending mi force wakeups
+	 */
+	intel_engine_wait_for_pending_mi_fw(engine);
 }
 
 static void guc_reset_nop(struct intel_engine_cs *engine)