drm/amdgpu: Add module param to control CIK support

If AMDGPU supports CIK, add a module parameter to control CIK
support. It's on by default in AMDGPU, while it is off by default
in radeon.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Michel Dänzer <michel.daenzer@amd.com>

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

@@ -115,6 +115,10 @@ extern int amdgpu_param_buf_per_se;
 extern int amdgpu_job_hang_limit;
 extern int amdgpu_lbpw;
 
+#ifdef CONFIG_DRM_AMDGPU_CIK
+extern int amdgpu_cik_support;
+#endif
+
 #define AMDGPU_DEFAULT_GTT_SIZE_MB		3072ULL /* 3GB by default */
 #define AMDGPU_WAIT_IDLE_TIMEOUT_IN_MS	        3000
 #define AMDGPU_MAX_USEC_TIMEOUT			100000	/* 100 ms */

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

@@ -242,6 +242,13 @@ module_param_named(job_hang_limit, amdgpu_job_hang_limit, int ,0444);
 MODULE_PARM_DESC(lbpw, "Load Balancing Per Watt (LBPW) support (1 = enable, 0 = disable, -1 = auto)");
 module_param_named(lbpw, amdgpu_lbpw, int, 0444);
 
+#ifdef CONFIG_DRM_AMDGPU_CIK
+int amdgpu_cik_support = 1;
+MODULE_PARM_DESC(cik_support, "CIK support (1 = enabled (default), 0 = disabled)");
+module_param_named(cik_support, amdgpu_cik_support, int, 0444);
+#endif
+
+
 static const struct pci_device_id pciidlist[] = {
 #ifdef  CONFIG_DRM_AMDGPU_SI
 	{0x1002, 0x6780, PCI_ANY_ID, PCI_ANY_ID, 0, 0, CHIP_TAHITI},

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

@@ -87,6 +87,21 @@ int amdgpu_driver_load_kms(struct drm_device *dev, unsigned long flags)
 	struct amdgpu_device *adev;
 	int r, acpi_status;
 
+#ifdef CONFIG_DRM_AMDGPU_CIK
+	if (!amdgpu_cik_support) {
+		switch (flags & AMD_ASIC_MASK) {
+		case CHIP_KAVERI:
+		case CHIP_BONAIRE:
+		case CHIP_HAWAII:
+		case CHIP_KABINI:
+		case CHIP_MULLINS:
+			dev_info(dev->dev,
+				 "CIK support disabled by module param\n");
+			return -ENODEV;
+		}
+	}
+#endif
+
 	adev = kzalloc(sizeof(struct amdgpu_device), GFP_KERNEL);
 	if (adev == NULL) {
 		return -ENOMEM;