drm/amdgpu: Fix KFD initialization for multi-GPU systems

kfd2kgd is device-specific, so it should not be a global variable.
Merge amdgpu_amdkfd_load_interface and amdgpu_amdkfd_device_probe
so that it's only needed as a local variable in one function.

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

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

@@ -27,7 +27,6 @@
 #include "amdgpu_gfx.h"
 #include <linux/module.h>
 
-const struct kfd2kgd_calls *kfd2kgd;
 const struct kgd2kfd_calls *kgd2kfd;
 bool (*kgd2kfd_init_p)(unsigned, const struct kgd2kfd_calls**);
 
@@ -61,8 +60,21 @@ int amdgpu_amdkfd_init(void)
 	return ret;
 }
 
-bool amdgpu_amdkfd_load_interface(struct amdgpu_device *adev)
+void amdgpu_amdkfd_fini(void)
+{
+	if (kgd2kfd) {
+		kgd2kfd->exit();
+		symbol_put(kgd2kfd_init);
+	}
+}
+
+void amdgpu_amdkfd_device_probe(struct amdgpu_device *adev)
 {
+	const struct kfd2kgd_calls *kfd2kgd;
+
+	if (!kgd2kfd)
+		return;
+
 	switch (adev->asic_type) {
 #ifdef CONFIG_DRM_AMDGPU_CIK
 	case CHIP_KAVERI:
@@ -73,25 +85,12 @@ bool amdgpu_amdkfd_load_interface(struct amdgpu_device *adev)
 		kfd2kgd = amdgpu_amdkfd_gfx_8_0_get_functions();
 		break;
 	default:
-		return false;
+		dev_info(adev->dev, "kfd not supported on this ASIC\n");
+		return;
 	}
 
-	return true;
-}
-
-void amdgpu_amdkfd_fini(void)
-{
-	if (kgd2kfd) {
-		kgd2kfd->exit();
-		symbol_put(kgd2kfd_init);
-	}
-}
-
-void amdgpu_amdkfd_device_probe(struct amdgpu_device *adev)
-{
-	if (kgd2kfd)
-		adev->kfd = kgd2kfd->probe((struct kgd_dev *)adev,
-					adev->pdev, kfd2kgd);
+	adev->kfd = kgd2kfd->probe((struct kgd_dev *)adev,
+				   adev->pdev, kfd2kgd);
 }
 
 void amdgpu_amdkfd_device_init(struct amdgpu_device *adev)

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

@@ -39,8 +39,6 @@ struct kgd_mem {
 int amdgpu_amdkfd_init(void);
 void amdgpu_amdkfd_fini(void);
 
-bool amdgpu_amdkfd_load_interface(struct amdgpu_device *adev);
-
 void amdgpu_amdkfd_suspend(struct amdgpu_device *adev);
 int amdgpu_amdkfd_resume(struct amdgpu_device *adev);
 void amdgpu_amdkfd_interrupt(struct amdgpu_device *adev,

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

@@ -158,7 +158,6 @@ int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags)
 				"Error during ACPI methods call\n");
 	}
 
-	amdgpu_amdkfd_load_interface(adev);
 	amdgpu_amdkfd_device_probe(adev);
 	amdgpu_amdkfd_device_init(adev);