drm/amdkfd: Make sched_policy a per-device setting

Some dGPUs don't support HWS. Allow them to use a per-device
sched_policy that may be different from the global default.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

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

@@ -901,7 +901,8 @@ static int kfd_ioctl_set_scratch_backing_va(struct file *filep,
 
 	mutex_unlock(&p->mutex);
 
-	if (sched_policy == KFD_SCHED_POLICY_NO_HWS && pdd->qpd.vmid != 0)
+	if (dev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS &&
+	    pdd->qpd.vmid != 0)
 		dev->kfd2kgd->set_scratch_backing_va(
 			dev->kgd, args->va_addr, pdd->qpd.vmid);
 

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

@@ -33,6 +33,7 @@
 #include "kfd_pm4_headers_diq.h"
 #include "kfd_dbgmgr.h"
 #include "kfd_dbgdev.h"
+#include "kfd_device_queue_manager.h"
 
 static DEFINE_MUTEX(kfd_dbgmgr_mutex);
 
@@ -83,7 +84,7 @@ bool kfd_dbgmgr_create(struct kfd_dbgmgr **ppmgr, struct kfd_dev *pdev)
 	}
 
 	/* get actual type of DBGDevice cpsch or not */
-	if (sched_policy == KFD_SCHED_POLICY_NO_HWS)
+	if (pdev->dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS)
 		type = DBGDEV_TYPE_NODIQ;
 
 	kfd_dbgdev_init(new_buff->dbgdev, pdev, type);

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

@@ -340,7 +340,7 @@ bool kgd2kfd_device_init(struct kfd_dev *kfd,
 		 kfd->pdev->device);
 
 	pr_debug("Starting kfd with the following scheduling policy %d\n",
-		sched_policy);
+		kfd->dqm->sched_policy);
 
 	goto out;
 

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

@@ -385,7 +385,7 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
 	prev_active = q->properties.is_active;
 
 	/* Make sure the queue is unmapped before updating the MQD */
-	if (sched_policy != KFD_SCHED_POLICY_NO_HWS) {
+	if (dqm->sched_policy != KFD_SCHED_POLICY_NO_HWS) {
 		retval = unmap_queues_cpsch(dqm,
 				KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
 		if (retval) {
@@ -417,7 +417,7 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
 	else if (!q->properties.is_active && prev_active)
 		dqm->queue_count--;
 
-	if (sched_policy != KFD_SCHED_POLICY_NO_HWS)
+	if (dqm->sched_policy != KFD_SCHED_POLICY_NO_HWS)
 		retval = map_queues_cpsch(dqm);
 	else if (q->properties.is_active &&
 		 (q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
@@ -1097,7 +1097,7 @@ static bool set_cache_memory_policy(struct device_queue_manager *dqm,
 			alternate_aperture_base,
 			alternate_aperture_size);
 
-	if ((sched_policy == KFD_SCHED_POLICY_NO_HWS) && (qpd->vmid != 0))
+	if ((dqm->sched_policy == KFD_SCHED_POLICY_NO_HWS) && (qpd->vmid != 0))
 		program_sh_mem_settings(dqm, qpd);
 
 	pr_debug("sh_mem_config: 0x%x, ape1_base: 0x%x, ape1_limit: 0x%x\n",
@@ -1242,8 +1242,24 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_dev *dev)
 	if (!dqm)
 		return NULL;
 
+	switch (dev->device_info->asic_family) {
+	/* HWS is not available on Hawaii. */
+	case CHIP_HAWAII:
+	/* HWS depends on CWSR for timely dequeue. CWSR is not
+	 * available on Tonga.
+	 *
+	 * FIXME: This argument also applies to Kaveri.
+	 */
+	case CHIP_TONGA:
+		dqm->sched_policy = KFD_SCHED_POLICY_NO_HWS;
+		break;
+	default:
+		dqm->sched_policy = sched_policy;
+		break;
+	}
+
 	dqm->dev = dev;
-	switch (sched_policy) {
+	switch (dqm->sched_policy) {
 	case KFD_SCHED_POLICY_HWS:
 	case KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION:
 		/* initialize dqm for cp scheduling */
@@ -1280,7 +1296,7 @@ struct device_queue_manager *device_queue_manager_init(struct kfd_dev *dev)
 		dqm->ops.process_termination = process_termination_nocpsch;
 		break;
 	default:
-		pr_err("Invalid scheduling policy %d\n", sched_policy);
+		pr_err("Invalid scheduling policy %d\n", dqm->sched_policy);
 		goto out_free;
 	}
 

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

@@ -180,6 +180,7 @@ struct device_queue_manager {
 	unsigned int		*fence_addr;
 	struct kfd_mem_obj	*fence_mem;
 	bool			active_runlist;
+	int			sched_policy;
 };
 
 void device_queue_manager_init_cik(

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

@@ -208,7 +208,8 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 
 	case KFD_QUEUE_TYPE_COMPUTE:
 		/* check if there is over subscription */
-		if ((sched_policy == KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION) &&
+		if ((dev->dqm->sched_policy ==
+		     KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION) &&
 		((dev->dqm->processes_count >= dev->vm_info.vmid_num_kfd) ||
 		(dev->dqm->queue_count >= get_queues_num(dev->dqm)))) {
 			pr_err("Over-subscription is not allowed in radeon_kfd.sched_policy == 1\n");