drm/i915/gvt: Wean gvt off dev_priv->engine[]

Stop trying to escape out of the gvt layer to find the engine that we
initially setup for use with gvt. Record the engines during initialisation
and use them henceforth.

add/remove: 1/4 grow/shrink: 22/28 up/down: 341/-1410 (-1069)

[Zhenyu: rebase, fix nonpriv register check fault, fix gvt engine
thread run failure.]

Cc: Ding Zhuocheng <zhuocheng.ding@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200304032307.2983-2-zhenyuw@linux.intel.com

1 files changed, 92 insertions, 112 deletions

diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index 73a2891114a4..9e065ad0658f 100644
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -462,7 +462,7 @@ enum {
 
 struct parser_exec_state {
 	struct intel_vgpu *vgpu;
-	int ring_id;
+	const struct intel_engine_cs *engine;
 
 	int buf_type;
 
@@ -635,39 +635,42 @@ static const struct decode_info *ring_decode_info[I915_NUM_ENGINES][8] = {
 	},
 };
 
-static inline u32 get_opcode(u32 cmd, int ring_id)
+static inline u32 get_opcode(u32 cmd, const struct intel_engine_cs *engine)
 {
 	const struct decode_info *d_info;
 
-	d_info = ring_decode_info[ring_id][CMD_TYPE(cmd)];
+	d_info = ring_decode_info[engine->id][CMD_TYPE(cmd)];
 	if (d_info == NULL)
 		return INVALID_OP;
 
 	return cmd >> (32 - d_info->op_len);
 }
 
-static inline const struct cmd_info *find_cmd_entry(struct intel_gvt *gvt,
-		unsigned int opcode, int ring_id)
+static inline const struct cmd_info *
+find_cmd_entry(struct intel_gvt *gvt, unsigned int opcode,
+	       const struct intel_engine_cs *engine)
 {
 	struct cmd_entry *e;
 
 	hash_for_each_possible(gvt->cmd_table, e, hlist, opcode) {
-		if (opcode == e->info->opcode && e->info->rings & BIT(ring_id))
+		if (opcode == e->info->opcode &&
+		    e->info->rings & engine->mask)
 			return e->info;
 	}
 	return NULL;
 }
 
-static inline const struct cmd_info *get_cmd_info(struct intel_gvt *gvt,
-		u32 cmd, int ring_id)
+static inline const struct cmd_info *
+get_cmd_info(struct intel_gvt *gvt, u32 cmd,
+	     const struct intel_engine_cs *engine)
 {
 	u32 opcode;
 
-	opcode = get_opcode(cmd, ring_id);
+	opcode = get_opcode(cmd, engine);
 	if (opcode == INVALID_OP)
 		return NULL;
 
-	return find_cmd_entry(gvt, opcode, ring_id);
+	return find_cmd_entry(gvt, opcode, engine);
 }
 
 static inline u32 sub_op_val(u32 cmd, u32 hi, u32 low)
@@ -675,12 +678,12 @@ static inline u32 sub_op_val(u32 cmd, u32 hi, u32 low)
 	return (cmd >> low) & ((1U << (hi - low + 1)) - 1);
 }
 
-static inline void print_opcode(u32 cmd, int ring_id)
+static inline void print_opcode(u32 cmd, const struct intel_engine_cs *engine)
 {
 	const struct decode_info *d_info;
 	int i;
 
-	d_info = ring_decode_info[ring_id][CMD_TYPE(cmd)];
+	d_info = ring_decode_info[engine->id][CMD_TYPE(cmd)];
 	if (d_info == NULL)
 		return;
 
@@ -709,10 +712,11 @@ static void parser_exec_state_dump(struct parser_exec_state *s)
 	int cnt = 0;
 	int i;
 
-	gvt_dbg_cmd("  vgpu%d RING%d: ring_start(%08lx) ring_end(%08lx)"
-			" ring_head(%08lx) ring_tail(%08lx)\n", s->vgpu->id,
-			s->ring_id, s->ring_start, s->ring_start + s->ring_size,
-			s->ring_head, s->ring_tail);
+	gvt_dbg_cmd("  vgpu%d RING%s: ring_start(%08lx) ring_end(%08lx)"
+		    " ring_head(%08lx) ring_tail(%08lx)\n",
+		    s->vgpu->id, s->engine->name,
+		    s->ring_start, s->ring_start + s->ring_size,
+		    s->ring_head, s->ring_tail);
 
 	gvt_dbg_cmd("  %s %s ip_gma(%08lx) ",
 			s->buf_type == RING_BUFFER_INSTRUCTION ?
@@ -729,7 +733,7 @@ static void parser_exec_state_dump(struct parser_exec_state *s)
 			s->ip_va, cmd_val(s, 0), cmd_val(s, 1),
 			cmd_val(s, 2), cmd_val(s, 3));
 
-	print_opcode(cmd_val(s, 0), s->ring_id);
+	print_opcode(cmd_val(s, 0), s->engine);
 
 	s->ip_va = (u32 *)((((u64)s->ip_va) >> 12) << 12);
 
@@ -840,7 +844,6 @@ static int force_nonpriv_reg_handler(struct parser_exec_state *s,
 	unsigned int data;
 	u32 ring_base;
 	u32 nopid;
-	struct drm_i915_private *dev_priv = s->vgpu->gvt->dev_priv;
 
 	if (!strcmp(cmd, "lri"))
 		data = cmd_val(s, index + 1);
@@ -850,7 +853,7 @@ static int force_nonpriv_reg_handler(struct parser_exec_state *s,
 		return -EINVAL;
 	}
 
-	ring_base = dev_priv->engine[s->ring_id]->mmio_base;
+	ring_base = s->engine->mmio_base;
 	nopid = i915_mmio_reg_offset(RING_NOPID(ring_base));
 
 	if (!intel_gvt_in_force_nonpriv_whitelist(gvt, data) &&
@@ -926,9 +929,9 @@ static int cmd_reg_handler(struct parser_exec_state *s,
 	 * update reg values in it into vregs, so LRIs in workload with
 	 * inhibit context will restore with correct values
 	 */
-	if (IS_GEN(gvt->dev_priv, 9) &&
-			intel_gvt_mmio_is_in_ctx(gvt, offset) &&
-			!strncmp(cmd, "lri", 3)) {
+	if (IS_GEN(s->engine->i915, 9) &&
+	    intel_gvt_mmio_is_in_ctx(gvt, offset) &&
+	    !strncmp(cmd, "lri", 3)) {
 		intel_gvt_hypervisor_read_gpa(s->vgpu,
 			s->workload->ring_context_gpa + 12, &ctx_sr_ctl, 4);
 		/* check inhibit context */
@@ -964,7 +967,6 @@ static int cmd_handler_lri(struct parser_exec_state *s)
 {
 	int i, ret = 0;
 	int cmd_len = cmd_length(s);
-	struct intel_gvt *gvt = s->vgpu->gvt;
 	u32 valid_len = CMD_LEN(1);
 
 	/*
@@ -979,8 +981,8 @@ static int cmd_handler_lri(struct parser_exec_state *s)
 	}
 
 	for (i = 1; i < cmd_len; i += 2) {
-		if (IS_BROADWELL(gvt->dev_priv) && s->ring_id != RCS0) {
-			if (s->ring_id == BCS0 &&
+		if (IS_BROADWELL(s->engine->i915) && s->engine->id != RCS0) {
+			if (s->engine->id == BCS0 &&
 			    cmd_reg(s, i) == i915_mmio_reg_offset(DERRMR))
 				ret |= 0;
 			else
@@ -1001,9 +1003,9 @@ static int cmd_handler_lrr(struct parser_exec_state *s)
 	int cmd_len = cmd_length(s);
 
 	for (i = 1; i < cmd_len; i += 2) {
-		if (IS_BROADWELL(s->vgpu->gvt->dev_priv))
+		if (IS_BROADWELL(s->engine->i915))
 			ret |= ((cmd_reg_inhibit(s, i) ||
-					(cmd_reg_inhibit(s, i + 1)))) ?
+				 (cmd_reg_inhibit(s, i + 1)))) ?
 				-EBADRQC : 0;
 		if (ret)
 			break;
@@ -1029,7 +1031,7 @@ static int cmd_handler_lrm(struct parser_exec_state *s)
 	int cmd_len = cmd_length(s);
 
 	for (i = 1; i < cmd_len;) {
-		if (IS_BROADWELL(gvt->dev_priv))
+		if (IS_BROADWELL(s->engine->i915))
 			ret |= (cmd_reg_inhibit(s, i)) ? -EBADRQC : 0;
 		if (ret)
 			break;
@@ -1141,7 +1143,7 @@ static int cmd_handler_pipe_control(struct parser_exec_state *s)
 				if (ret)
 					return ret;
 				if (index_mode) {
-					hws_pga = s->vgpu->hws_pga[s->ring_id];
+					hws_pga = s->vgpu->hws_pga[s->engine->id];
 					gma = hws_pga + gma;
 					patch_value(s, cmd_ptr(s, 2), gma);
 					val = cmd_val(s, 1) & (~(1 << 21));
@@ -1155,15 +1157,15 @@ static int cmd_handler_pipe_control(struct parser_exec_state *s)
 		return ret;
 
 	if (cmd_val(s, 1) & PIPE_CONTROL_NOTIFY)
-		set_bit(cmd_interrupt_events[s->ring_id].pipe_control_notify,
-				s->workload->pending_events);
+		set_bit(cmd_interrupt_events[s->engine->id].pipe_control_notify,
+			s->workload->pending_events);
 	return 0;
 }
 
 static int cmd_handler_mi_user_interrupt(struct parser_exec_state *s)
 {
-	set_bit(cmd_interrupt_events[s->ring_id].mi_user_interrupt,
-			s->workload->pending_events);
+	set_bit(cmd_interrupt_events[s->engine->id].mi_user_interrupt,
+		s->workload->pending_events);
 	patch_value(s, cmd_ptr(s, 0), MI_NOOP);
 	return 0;
 }
@@ -1213,7 +1215,7 @@ struct plane_code_mapping {
 static int gen8_decode_mi_display_flip(struct parser_exec_state *s,
 		struct mi_display_flip_command_info *info)
 {
-	struct drm_i915_private *dev_priv = s->vgpu->gvt->dev_priv;
+	struct drm_i915_private *dev_priv = s->engine->i915;
 	struct plane_code_mapping gen8_plane_code[] = {
 		[0] = {PIPE_A, PLANE_A, PRIMARY_A_FLIP_DONE},
 		[1] = {PIPE_B, PLANE_A, PRIMARY_B_FLIP_DONE},
@@ -1259,7 +1261,7 @@ static int gen8_decode_mi_display_flip(struct parser_exec_state *s,
 static int skl_decode_mi_display_flip(struct parser_exec_state *s,
 		struct mi_display_flip_command_info *info)
 {
-	struct drm_i915_private *dev_priv = s->vgpu->gvt->dev_priv;
+	struct drm_i915_private *dev_priv = s->engine->i915;
 	struct intel_vgpu *vgpu = s->vgpu;
 	u32 dword0 = cmd_val(s, 0);
 	u32 dword1 = cmd_val(s, 1);
@@ -1318,13 +1320,12 @@ static int skl_decode_mi_display_flip(struct parser_exec_state *s,
 static int gen8_check_mi_display_flip(struct parser_exec_state *s,
 		struct mi_display_flip_command_info *info)
 {
-	struct drm_i915_private *dev_priv = s->vgpu->gvt->dev_priv;
 	u32 stride, tile;
 
 	if (!info->async_flip)
 		return 0;
 
-	if (INTEL_GEN(dev_priv) >= 9) {
+	if (INTEL_GEN(s->engine->i915) >= 9) {
 		stride = vgpu_vreg_t(s->vgpu, info->stride_reg) & GENMASK(9, 0);
 		tile = (vgpu_vreg_t(s->vgpu, info->ctrl_reg) &
 				GENMASK(12, 10)) >> 10;
@@ -1347,7 +1348,7 @@ static int gen8_update_plane_mmio_from_mi_display_flip(
 		struct parser_exec_state *s,
 		struct mi_display_flip_command_info *info)
 {
-	struct drm_i915_private *dev_priv = s->vgpu->gvt->dev_priv;
+	struct drm_i915_private *dev_priv = s->engine->i915;
 	struct intel_vgpu *vgpu = s->vgpu;
 
 	set_mask_bits(&vgpu_vreg_t(vgpu, info->surf_reg), GENMASK(31, 12),
@@ -1378,11 +1379,9 @@ static int gen8_update_plane_mmio_from_mi_display_flip(
 static int decode_mi_display_flip(struct parser_exec_state *s,
 		struct mi_display_flip_command_info *info)
 {
-	struct drm_i915_private *dev_priv = s->vgpu->gvt->dev_priv;
-
-	if (IS_BROADWELL(dev_priv))
+	if (IS_BROADWELL(s->engine->i915))
 		return gen8_decode_mi_display_flip(s, info);
-	if (INTEL_GEN(dev_priv) >= 9)
+	if (INTEL_GEN(s->engine->i915) >= 9)
 		return skl_decode_mi_display_flip(s, info);
 
 	return -ENODEV;
@@ -1667,7 +1666,7 @@ static int cmd_handler_mi_flush_dw(struct parser_exec_state *s)
 		if (ret)
 			return ret;
 		if (index_mode) {
-			hws_pga = s->vgpu->hws_pga[s->ring_id];
+			hws_pga = s->vgpu->hws_pga[s->engine->id];
 			gma = hws_pga + gma;
 			patch_value(s, cmd_ptr(s, 1), gma);
 			val = cmd_val(s, 0) & (~(1 << 21));
@@ -1676,8 +1675,8 @@ static int cmd_handler_mi_flush_dw(struct parser_exec_state *s)
 	}
 	/* Check notify bit */
 	if ((cmd_val(s, 0) & (1 << 8)))
-		set_bit(cmd_interrupt_events[s->ring_id].mi_flush_dw,
-				s->workload->pending_events);
+		set_bit(cmd_interrupt_events[s->engine->id].mi_flush_dw,
+			s->workload->pending_events);
 	return ret;
 }
 
@@ -1725,12 +1724,18 @@ static int copy_gma_to_hva(struct intel_vgpu *vgpu, struct intel_vgpu_mm *mm,
 static int batch_buffer_needs_scan(struct parser_exec_state *s)
 {
 	/* Decide privilege based on address space */
-	if (cmd_val(s, 0) & (1 << 8) &&
-			!(s->vgpu->scan_nonprivbb & (1 << s->ring_id)))
+	if (cmd_val(s, 0) & BIT(8) &&
+	    !(s->vgpu->scan_nonprivbb & s->engine->mask))
 		return 0;
+
 	return 1;
 }
 
+static const char *repr_addr_type(unsigned int type)
+{
+	return type == PPGTT_BUFFER ? "ppgtt" : "ggtt";
+}
+
 static int find_bb_size(struct parser_exec_state *s,
 			unsigned long *bb_size,
 			unsigned long *bb_end_cmd_offset)
@@ -1753,24 +1758,24 @@ static int find_bb_size(struct parser_exec_state *s,
 		return -EFAULT;
 
 	cmd = cmd_val(s, 0);
-	info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id);
+	info = get_cmd_info(s->vgpu->gvt, cmd, s->engine);
 	if (info == NULL) {
-		gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n",
-				cmd, get_opcode(cmd, s->ring_id),
-				(s->buf_addr_type == PPGTT_BUFFER) ?
-				"ppgtt" : "ggtt", s->ring_id, s->workload);
+		gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %s, workload=%p\n",
+			     cmd, get_opcode(cmd, s->engine),
+			     repr_addr_type(s->buf_addr_type),
+			     s->engine->name, s->workload);
 		return -EBADRQC;
 	}
 	do {
 		if (copy_gma_to_hva(s->vgpu, mm,
-				gma, gma + 4, &cmd) < 0)
+				    gma, gma + 4, &cmd) < 0)
 			return -EFAULT;
-		info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id);
+		info = get_cmd_info(s->vgpu->gvt, cmd, s->engine);
 		if (info == NULL) {
-			gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n",
-				cmd, get_opcode(cmd, s->ring_id),
-				(s->buf_addr_type == PPGTT_BUFFER) ?
-				"ppgtt" : "ggtt", s->ring_id, s->workload);
+			gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %s, workload=%p\n",
+				     cmd, get_opcode(cmd, s->engine),
+				     repr_addr_type(s->buf_addr_type),
+				     s->engine->name, s->workload);
 			return -EBADRQC;
 		}
 
@@ -1799,12 +1804,12 @@ static int audit_bb_end(struct parser_exec_state *s, void *va)
 	u32 cmd = *(u32 *)va;
 	const struct cmd_info *info;
 
-	info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id);
+	info = get_cmd_info(s->vgpu->gvt, cmd, s->engine);
 	if (info == NULL) {
-		gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n",
-			cmd, get_opcode(cmd, s->ring_id),
-			(s->buf_addr_type == PPGTT_BUFFER) ?
-			"ppgtt" : "ggtt", s->ring_id, s->workload);
+		gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %s, workload=%p\n",
+			     cmd, get_opcode(cmd, s->engine),
+			     repr_addr_type(s->buf_addr_type),
+			     s->engine->name, s->workload);
 		return -EBADRQC;
 	}
 
@@ -1857,7 +1862,7 @@ static int perform_bb_shadow(struct parser_exec_state *s)
 	if (bb->ppgtt)
 		start_offset = gma & ~I915_GTT_PAGE_MASK;
 
-	bb->obj = i915_gem_object_create_shmem(s->vgpu->gvt->dev_priv,
+	bb->obj = i915_gem_object_create_shmem(s->engine->i915,
 					       round_up(bb_size + start_offset,
 							PAGE_SIZE));
 	if (IS_ERR(bb->obj)) {
@@ -2666,25 +2671,25 @@ static int cmd_parser_exec(struct parser_exec_state *s)
 	if (cmd == MI_NOOP)
 		info = &cmd_info[mi_noop_index];
 	else
-		info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id);
+		info = get_cmd_info(s->vgpu->gvt, cmd, s->engine);
 
 	if (info == NULL) {
-		gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n",
-				cmd, get_opcode(cmd, s->ring_id),
-				(s->buf_addr_type == PPGTT_BUFFER) ?
-				"ppgtt" : "ggtt", s->ring_id, s->workload);
+		gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %s, workload=%p\n",
+			     cmd, get_opcode(cmd, s->engine),
+			     repr_addr_type(s->buf_addr_type),
+			     s->engine->name, s->workload);
 		return -EBADRQC;
 	}
 
 	s->info = info;
 
-	trace_gvt_command(vgpu->id, s->ring_id, s->ip_gma, s->ip_va,
+	trace_gvt_command(vgpu->id, s->engine->id, s->ip_gma, s->ip_va,
 			  cmd_length(s), s->buf_type, s->buf_addr_type,
 			  s->workload, info->name);
 
 	if ((info->flag & F_LEN_MASK) == F_LEN_VAR_FIXED) {
 		ret = gvt_check_valid_cmd_length(cmd_length(s),
-			info->valid_len);
+						 info->valid_len);
 		if (ret)
 			return ret;
 	}
@@ -2781,7 +2786,7 @@ static int scan_workload(struct intel_vgpu_workload *workload)
 	s.buf_type = RING_BUFFER_INSTRUCTION;
 	s.buf_addr_type = GTT_BUFFER;
 	s.vgpu = workload->vgpu;
-	s.ring_id = workload->ring_id;
+	s.engine = workload->engine;
 	s.ring_start = workload->rb_start;
 	s.ring_size = _RING_CTL_BUF_SIZE(workload->rb_ctl);
 	s.ring_head = gma_head;
@@ -2790,8 +2795,7 @@ static int scan_workload(struct intel_vgpu_workload *workload)
 	s.workload = workload;
 	s.is_ctx_wa = false;
 
-	if ((bypass_scan_mask & (1 << workload->ring_id)) ||
-		gma_head == gma_tail)
+	if (bypass_scan_mask & workload->engine->mask || gma_head == gma_tail)
 		return 0;
 
 	ret = ip_gma_set(&s, gma_head);
@@ -2830,7 +2834,7 @@ static int scan_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 	s.buf_type = RING_BUFFER_INSTRUCTION;
 	s.buf_addr_type = GTT_BUFFER;
 	s.vgpu = workload->vgpu;
-	s.ring_id = workload->ring_id;
+	s.engine = workload->engine;
 	s.ring_start = wa_ctx->indirect_ctx.guest_gma;
 	s.ring_size = ring_size;
 	s.ring_head = gma_head;
@@ -2855,7 +2859,6 @@ static int shadow_workload_ring_buffer(struct intel_vgpu_workload *workload)
 	struct intel_vgpu_submission *s = &vgpu->submission;
 	unsigned long gma_head, gma_tail, gma_top, guest_rb_size;
 	void *shadow_ring_buffer_va;
-	int ring_id = workload->ring_id;
 	int ret;
 
 	guest_rb_size = _RING_CTL_BUF_SIZE(workload->rb_ctl);
@@ -2868,21 +2871,21 @@ static int shadow_workload_ring_buffer(struct intel_vgpu_workload *workload)
 	gma_tail = workload->rb_start + workload->rb_tail;
 	gma_top = workload->rb_start + guest_rb_size;
 
-	if (workload->rb_len > s->ring_scan_buffer_size[ring_id]) {
+	if (workload->rb_len > s->ring_scan_buffer_size[workload->engine->id]) {
 		void *p;
 
 		/* realloc the new ring buffer if needed */
-		p = krealloc(s->ring_scan_buffer[ring_id], workload->rb_len,
-				GFP_KERNEL);
+		p = krealloc(s->ring_scan_buffer[workload->engine->id],
+			     workload->rb_len, GFP_KERNEL);
 		if (!p) {
 			gvt_vgpu_err("fail to re-alloc ring scan buffer\n");
 			return -ENOMEM;
 		}
-		s->ring_scan_buffer[ring_id] = p;
-		s->ring_scan_buffer_size[ring_id] = workload->rb_len;
+		s->ring_scan_buffer[workload->engine->id] = p;
+		s->ring_scan_buffer_size[workload->engine->id] = workload->rb_len;
 	}
 
-	shadow_ring_buffer_va = s->ring_scan_buffer[ring_id];
+	shadow_ring_buffer_va = s->ring_scan_buffer[workload->engine->id];
 
 	/* get shadow ring buffer va */
 	workload->shadow_ring_buffer_va = shadow_ring_buffer_va;
@@ -2940,7 +2943,7 @@ static int shadow_indirect_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 	int ret = 0;
 	void *map;
 
-	obj = i915_gem_object_create_shmem(workload->vgpu->gvt->dev_priv,
+	obj = i915_gem_object_create_shmem(workload->engine->i915,
 					   roundup(ctx_size + CACHELINE_BYTES,
 						   PAGE_SIZE));
 	if (IS_ERR(obj))
@@ -3029,30 +3032,14 @@ int intel_gvt_scan_and_shadow_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 	return 0;
 }
 
-static const struct cmd_info *find_cmd_entry_any_ring(struct intel_gvt *gvt,
-		unsigned int opcode, unsigned long rings)
-{
-	const struct cmd_info *info = NULL;
-	unsigned int ring;
-
-	for_each_set_bit(ring, &rings, I915_NUM_ENGINES) {
-		info = find_cmd_entry(gvt, opcode, ring);
-		if (info)
-			break;
-	}
-	return info;
-}
-
 static int init_cmd_table(struct intel_gvt *gvt)
 {
+	unsigned int gen_type = intel_gvt_get_device_type(gvt);
 	int i;
-	struct cmd_entry *e;
-	const struct cmd_info *info;
-	unsigned int gen_type;
-
-	gen_type = intel_gvt_get_device_type(gvt);
 
 	for (i = 0; i < ARRAY_SIZE(cmd_info); i++) {
+		struct cmd_entry *e;
+
 		if (!(cmd_info[i].devices & gen_type))
 			continue;
 
@@ -3061,23 +3048,16 @@ static int init_cmd_table(struct intel_gvt *gvt)
 			return -ENOMEM;
 
 		e->info = &cmd_info[i];
-		info = find_cmd_entry_any_ring(gvt,
-				e->info->opcode, e->info->rings);
-		if (info) {
-			gvt_err("%s %s duplicated\n", e->info->name,
-					info->name);
-			kfree(e);
-			return -EEXIST;
-		}
 		if (cmd_info[i].opcode == OP_MI_NOOP)
 			mi_noop_index = i;
 
 		INIT_HLIST_NODE(&e->hlist);
 		add_cmd_entry(gvt, e);
 		gvt_dbg_cmd("add %-30s op %04x flag %x devs %02x rings %02x\n",
-				e->info->name, e->info->opcode, e->info->flag,
-				e->info->devices, e->info->rings);
+			    e->info->name, e->info->opcode, e->info->flag,
+			    e->info->devices, e->info->rings);
 	}
+
 	return 0;
 }