drm/amdkfd: Use bitmap_zalloc() when applicable

'doorbell_bitmap' and 'queue_slot_bitmap' are bitmaps. So use
'bitmap_zalloc()' to simplify code, improve the semantic and avoid some
open-coded arithmetic in allocator arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_process.c

@@ -1011,7 +1011,7 @@ static void kfd_process_destroy_pdds(struct kfd_process *p)
 			free_pages((unsigned long)pdd->qpd.cwsr_kaddr,
 				get_order(KFD_CWSR_TBA_TMA_SIZE));
 
-		kfree(pdd->qpd.doorbell_bitmap);
+		bitmap_free(pdd->qpd.doorbell_bitmap);
 		idr_destroy(&pdd->alloc_idr);
 
 		kfd_free_process_doorbells(pdd->dev, pdd->doorbell_index);
@@ -1433,9 +1433,8 @@ static int init_doorbell_bitmap(struct qcm_process_device *qpd,
 	if (!KFD_IS_SOC15(dev))
 		return 0;
 
-	qpd->doorbell_bitmap =
-		kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
-				     BITS_PER_BYTE), GFP_KERNEL);
+	qpd->doorbell_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
+					     GFP_KERNEL);
 	if (!qpd->doorbell_bitmap)
 		return -ENOMEM;
 

drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c

@@ -135,9 +135,8 @@ void kfd_process_dequeue_from_all_devices(struct kfd_process *p)
 int pqm_init(struct process_queue_manager *pqm, struct kfd_process *p)
 {
 	INIT_LIST_HEAD(&pqm->queues);
-	pqm->queue_slot_bitmap =
-			kzalloc(DIV_ROUND_UP(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
-					BITS_PER_BYTE), GFP_KERNEL);
+	pqm->queue_slot_bitmap = bitmap_zalloc(KFD_MAX_NUM_OF_QUEUES_PER_PROCESS,
+					       GFP_KERNEL);
 	if (!pqm->queue_slot_bitmap)
 		return -ENOMEM;
 	pqm->process = p;
@@ -159,7 +158,7 @@ void pqm_uninit(struct process_queue_manager *pqm)
 		kfree(pqn);
 	}
 
-	kfree(pqm->queue_slot_bitmap);
+	bitmap_free(pqm->queue_slot_bitmap);
 	pqm->queue_slot_bitmap = NULL;
 }