drm/amdgpu: Clean up KFD init and fini

Only initialize KFD once by moving amdgpu_amdkfd_init from
amdgpu_pci_probe to amdgpu_init. This fixes kernel oopses and hangs
when booting multi-GPU systems.

Also removed some vestiges of KFD being its own module.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -28,7 +28,6 @@
 #include <linux/module.h>
 
 const struct kgd2kfd_calls *kgd2kfd;
-bool (*kgd2kfd_init_p)(unsigned int, const struct kgd2kfd_calls**);
 
 static const unsigned int compute_vmid_bitmap = 0xFF00;
 
@@ -51,10 +50,8 @@ int amdgpu_amdkfd_init(void)
 
 void amdgpu_amdkfd_fini(void)
 {
-	if (kgd2kfd) {
+	if (kgd2kfd)
 		kgd2kfd->exit();
-		symbol_put(kgd2kfd_init);
-	}
 }
 
 void amdgpu_amdkfd_device_probe(struct amdgpu_device *adev)

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

@@ -922,14 +922,6 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
 		return -ENODEV;
 	}
 
-	/*
-	 * Initialize amdkfd before starting radeon. If it was not loaded yet,
-	 * defer radeon probing
-	 */
-	ret = amdgpu_amdkfd_init();
-	if (ret == -EPROBE_DEFER)
-		return ret;
-
 	/* Get rid of things like offb */
 	ret = amdgpu_kick_out_firmware_fb(pdev);
 	if (ret)
@@ -1274,6 +1266,10 @@ static int __init amdgpu_init(void)
 	pdriver = &amdgpu_kms_pci_driver;
 	driver->num_ioctls = amdgpu_max_kms_ioctl;
 	amdgpu_register_atpx_handler();
+
+	/* Ignore KFD init failures. Normal when CONFIG_HSA_AMD is not set. */
+	amdgpu_amdkfd_init();
+
 	/* let modprobe override vga console setting */
 	return pci_register_driver(pdriver);