drm/amdkfd: Process-device data creation and lookup split

This patch splits the current kfd_get_process_device_data() to two
functions, one that specifically creates a pdd and another one which
just do lookup.

This is done to enhance the readability and maintainability of the code.
Signed-off-by: Alexey Skidanov <Alexey.Skidanov@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>

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

@@ -75,7 +75,6 @@ get_sh_mem_bases_nybble_64(struct kfd_process_device *pdd)
 	nybble = (pdd->lds_base >> 60) & 0x0E;
 
 	return nybble;
-
 }
 
 static inline unsigned int get_sh_mem_bases_32(struct kfd_process_device *pdd)

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

@@ -137,10 +137,6 @@ int kfd_doorbell_mmap(struct kfd_process *process, struct vm_area_struct *vma)
 	if (dev == NULL)
 		return -EINVAL;
 
-	/* Find if pdd exists for combination of process and gpu id */
-	if (!kfd_get_process_device_data(dev, process, 0))
-		return -EINVAL;
-
 	/* Calculate physical address of doorbell */
 	address = kfd_get_process_doorbells(dev, process);
 

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

@@ -303,10 +303,11 @@ int kfd_init_apertures(struct kfd_process *process)
 	while ((dev = kfd_topology_enum_kfd_devices(id)) != NULL &&
 		id < NUM_OF_SUPPORTED_GPUS) {
 
-		pdd = kfd_get_process_device_data(dev, process, 1);
-		if (!pdd)
+		pdd = kfd_create_process_device_data(dev, process);
+		if (pdd == NULL) {
+			pr_err("Failed to create process device data\n");
 			return -1;
-
+		}
 		/*
 		 * For 64 bit process aperture will be statically reserved in
 		 * the x86_64 non canonical process address space

drivers/gpu/drm/amd/amdkfd/kfd_priv.h

@@ -473,8 +473,9 @@ struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
 							struct kfd_process *p);
 void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid);
 struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
-							struct kfd_process *p,
-							int create_pdd);
+							struct kfd_process *p);
+struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
+							struct kfd_process *p);
 
 /* Process device data iterator */
 struct kfd_process_device *kfd_get_first_process_device_data(struct kfd_process *p);

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

@@ -311,16 +311,22 @@ static struct kfd_process *create_process(const struct task_struct *thread)
 }
 
 struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
-							struct kfd_process *p,
-							int create_pdd)
+							struct kfd_process *p)
 {
 	struct kfd_process_device *pdd = NULL;
 
 	list_for_each_entry(pdd, &p->per_device_data, per_device_list)
 		if (pdd->dev == dev)
+			break;
+
 	return pdd;
+}
+
+struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
+							struct kfd_process *p)
+{
+	struct kfd_process_device *pdd = NULL;
 
-	if (create_pdd) {
 	pdd = kzalloc(sizeof(*pdd), GFP_KERNEL);
 	if (pdd != NULL) {
 		pdd->dev = dev;
@@ -329,7 +335,6 @@ struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
 		pdd->qpd.dqm = dev->dqm;
 		list_add(&pdd->per_device_list, &p->per_device_data);
 	}
-	}
 
 	return pdd;
 }
@@ -344,11 +349,14 @@ struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
 struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
 							struct kfd_process *p)
 {
-	struct kfd_process_device *pdd = kfd_get_process_device_data(dev, p, 1);
+	struct kfd_process_device *pdd;
 	int err;
 
-	if (pdd == NULL)
+	pdd = kfd_get_process_device_data(dev, p);
+	if (!pdd) {
+		pr_err("Process device data doesn't exist\n");
 		return ERR_PTR(-ENOMEM);
+	}
 
 	if (pdd->bound)
 		return pdd;
@@ -384,7 +392,7 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
 
 	pqm_uninit(&p->pqm);
 
-	pdd = kfd_get_process_device_data(dev, p, 0);
+	pdd = kfd_get_process_device_data(dev, p);
 
 	/*
 	 * Just mark pdd as unbound, because we still need it to call

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

@@ -167,8 +167,11 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 	q = NULL;
 	kq = NULL;
 
-	pdd = kfd_get_process_device_data(dev, pqm->process, 1);
-	BUG_ON(!pdd);
+	pdd = kfd_get_process_device_data(dev, pqm->process);
+	if (!pdd) {
+		pr_err("Process device data doesn't exist\n");
+		return -1;
+	}
 
 	retval = find_available_queue_slot(pqm, qid);
 	if (retval != 0)
@@ -273,8 +276,11 @@ int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid)
 		dev = pqn->q->device;
 	BUG_ON(!dev);
 
-	pdd = kfd_get_process_device_data(dev, pqm->process, 1);
-	BUG_ON(!pdd);
+	pdd = kfd_get_process_device_data(dev, pqm->process);
+	if (!pdd) {
+		pr_err("Process device data doesn't exist\n");
+		return -1;
+	}
 
 	if (pqn->kq) {
 		/* destroy kernel queue (DIQ) */