[PATCH v2 3/3] amdkfd: Add device links between kfd device and amdgpu device

["Mario Limonciello (AMD)" <superm1@kernel.org>]

Mapping out a KFD device to a GPU can be done manually by looking at the
domain and location properties.  To make it easier to discover which
KFD device goes with what GPU add bidirectional links.

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c    |  8 +++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h    |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c    |  4 +++
 drivers/gpu/drm/amd/amdkfd/kfd_topology.c     | 36 +++++++++++++++++++
 .../gpu/drm/amd/include/kgd_kfd_interface.h   |  2 ++
 5 files changed, 51 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
index a2879d2b7c8ec..5d6cf3adfa7b8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
@@ -910,3 +910,11 @@ int amdgpu_amdkfd_config_sq_perfmon(struct amdgpu_device *adev, uint32_t xcp_id,
 
 	return r;
 }
+
+int amdgpu_amdkfd_create_sysfs_links(struct amdgpu_device *adev)
+{
+	if (!adev->kfd.init_complete || !adev->kfd.dev)
+		return 0;
+
+	return kgd2kfd_create_sysfs_links(adev->kfd.dev);
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index da4575676335f..fd92b227a674b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -272,6 +272,7 @@ 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);
+int amdgpu_amdkfd_create_sysfs_links(struct amdgpu_device *adev);
 
 
 /* Read user wptr from a specified user address space with page fault
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 7a0213a07023d..44c9320d72a56 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4947,6 +4947,10 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	 */
 	r = amdgpu_device_sys_interface_init(adev);
 
+	r = amdgpu_amdkfd_create_sysfs_links(adev);
+	if (r)
+		dev_err(adev->dev, "Failed to create KFD sysfs link: %d\n", r);
+
 	if (IS_ENABLED(CONFIG_PERF_EVENTS))
 		r = amdgpu_pmu_init(adev);
 	if (r)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
index b65f29294e2d6..796fd411a7dcc 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
@@ -79,6 +79,37 @@ struct kfd_topology_device *kfd_topology_device_by_proximity_domain(
 	return device;
 }
 
+int kgd2kfd_create_sysfs_links(struct kfd_dev *kfd)
+{
+	struct kfd_topology_device *top_dev;
+	int ret = -ENODEV;
+
+	if (!kfd)
+		return -EINVAL;
+
+	down_read(&topology_lock);
+
+	list_for_each_entry(top_dev, &topology_device_list, list) {
+		struct kobject *amdgpu_kobj;
+
+		if (!top_dev->gpu || top_dev->gpu->kfd != kfd || !top_dev->kobj_node)
+			continue;
+
+		amdgpu_kobj = &top_dev->gpu->adev->dev->kobj;
+		ret = sysfs_create_link(top_dev->kobj_node, amdgpu_kobj, "device");
+		if (ret)
+			break;
+
+		ret = sysfs_create_link(amdgpu_kobj, top_dev->kobj_node, "kfd");
+		if (ret)
+			sysfs_remove_link(top_dev->kobj_node, "device");
+		break;
+	}
+
+	up_read(&topology_lock);
+	return ret;
+}
+
 struct kfd_topology_device *kfd_topology_device_by_id(uint32_t gpu_id)
 {
 	struct kfd_topology_device *top_dev = NULL;
@@ -571,6 +602,11 @@ static void kfd_remove_sysfs_node_entry(struct kfd_topology_device *dev)
 	struct kfd_mem_properties *mem;
 	struct kfd_perf_properties *perf;
 
+	if (dev->gpu) {
+		sysfs_remove_link(dev->kobj_node, "device");
+		sysfs_remove_link(&dev->gpu->adev->dev->kobj, "kfd");
+	}
+
 	if (dev->kobj_iolink) {
 		list_for_each_entry(iolink, &dev->io_link_props, list)
 			if (iolink->kobj) {
diff --git a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
index 9aba8596faa7e..f6db1dc634399 100644
--- a/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
+++ b/drivers/gpu/drm/amd/include/kgd_kfd_interface.h
@@ -335,4 +335,6 @@ struct kfd2kgd_calls {
 					  int engine, int queue);
 };
 
+int kgd2kfd_create_sysfs_links(struct kfd_dev *kfd);
+
 #endif	/* KGD_KFD_INTERFACE_H_INCLUDED */
-- 
2.43.0