drm/amdkfd: Shift sdma_engine_id and sdma_queue_id in mqd

FW of some new ASICs requires sdma mqd size to be not more than
128 dwords. Repurpose the last 2 reserved fields of sdma mqd for
driver internal use, so the total mqd size is no bigger than 128
dwords
Signed-off-by: Oak Zeng <ozeng@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/cik_structs.h

@@ -282,8 +282,7 @@ struct cik_sdma_rlc_registers {
 	uint32_t reserved_123;
 	uint32_t reserved_124;
 	uint32_t reserved_125;
-	uint32_t reserved_126;
-	uint32_t reserved_127;
+	/* reserved_126,127: repurposed for driver-internal use */
 	uint32_t sdma_engine_id;
 	uint32_t sdma_queue_id;
 };

drivers/gpu/drm/amd/include/v9_structs.h

@@ -151,8 +151,7 @@ struct v9_sdma_mqd {
 	uint32_t reserved_123;
 	uint32_t reserved_124;
 	uint32_t reserved_125;
-	uint32_t reserved_126;
-	uint32_t reserved_127;
+	/* reserved_126,127: repurposed for driver-internal use */
 	uint32_t sdma_engine_id;
 	uint32_t sdma_queue_id;
 };

drivers/gpu/drm/amd/include/vi_structs.h

@@ -151,8 +151,7 @@ struct vi_sdma_mqd {
 	uint32_t reserved_123;
 	uint32_t reserved_124;
 	uint32_t reserved_125;
-	uint32_t reserved_126;
-	uint32_t reserved_127;
+	/* reserved_126,127: repurposed for driver-internal use */
 	uint32_t sdma_engine_id;
 	uint32_t sdma_queue_id;
 };