drm/amdkfd: add an interface to query whether is KFD is active

Add an interface to query whether KFD has any active queues.

v2: fix build issues

Acked-by: Srinivasan Shanmugam <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c

···
 	return kgd2kfd_start_sched(adev->kfd.dev, node_id);
 }
 
+/* check if there are KFD queues active */
+bool amdgpu_amdkfd_compute_active(struct amdgpu_device *adev, uint32_t node_id)
+{
+	if (!adev->kfd.init_complete)
+		return false;
+
+	return kgd2kfd_compute_active(adev->kfd.dev, node_id);
+}
+
 /* Config CGTT_SQ_CLK_CTRL */
 int amdgpu_amdkfd_config_sq_perfmon(struct amdgpu_device *adev, uint32_t xcp_id,
 	bool core_override_enable, bool reg_override_enable, bool perfmon_override_enable)

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

···
 int amdgpu_amdkfd_stop_sched(struct amdgpu_device *adev, uint32_t node_id);
 int amdgpu_amdkfd_config_sq_perfmon(struct amdgpu_device *adev, uint32_t xcp_id,
 	bool core_override_enable, bool reg_override_enable, bool perfmon_override_enable);
+bool amdgpu_amdkfd_compute_active(struct amdgpu_device *adev, uint32_t node_id);
 
 
 /* Read user wptr from a specified user address space with page fault
···
 void kgd2kfd_unlock_kfd(void);
 int kgd2kfd_start_sched(struct kfd_dev *kfd, uint32_t node_id);
 int kgd2kfd_stop_sched(struct kfd_dev *kfd, uint32_t node_id);
+bool kgd2kfd_compute_active(struct kfd_dev *kfd, uint32_t node_id);
 #else
 static inline int kgd2kfd_init(void)
 {
···
 static inline int kgd2kfd_stop_sched(struct kfd_dev *kfd, uint32_t node_id)
 {
 	return 0;
+}
+
+static inline bool kgd2kfd_compute_active(struct kfd_dev *kfd, uint32_t node_id)
+{
+	return false;
 }
 #endif
 #endif /* AMDGPU_AMDKFD_H_INCLUDED */

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

···
 	WARN_ONCE(count < 0, "Compute profile ref. count error");
 }
 
+static bool kfd_compute_active(struct kfd_node *node)
+{
+	if (atomic_read(&node->kfd->compute_profile))
+		return true;
+	return false;
+}
+
 void kgd2kfd_smi_event_throttle(struct kfd_dev *kfd, uint64_t throttle_bitmask)
 {
 	/*
···
 
 	node = kfd->nodes[node_id];
 	return node->dqm->ops.halt(node->dqm);
+}
+
+bool kgd2kfd_compute_active(struct kfd_dev *kfd, uint32_t node_id)
+{
+	struct kfd_node *node;
+
+	if (!kfd->init_complete)
+		return false;
+
+	if (node_id >= kfd->num_nodes) {
+		dev_warn(kfd->adev->dev, "Invalid node ID: %u exceeds %u\n",
+			 node_id, kfd->num_nodes - 1);
+		return false;
+	}
+
+	node = kfd->nodes[node_id];
+
+	return kfd_compute_active(node);
 }
 
 #if defined(CONFIG_DEBUG_FS)