1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2021 Intel Corporation 4 */ 5 6 #include <linux/string_helpers.h> 7 8 #include "intel_guc_rc.h" 9 #include "intel_guc_print.h" 10 #include "gt/intel_gt.h" 11 #include "i915_drv.h" 12 13 static bool __guc_rc_supported(struct intel_guc *guc) 14 { 15 /* GuC RC is unavailable for pre-Gen12 */ 16 return guc->submission_supported && 17 GRAPHICS_VER(guc_to_gt(guc)->i915) >= 12; 18 } 19 20 static bool __guc_rc_selected(struct intel_guc *guc) 21 { 22 if (!intel_guc_rc_is_supported(guc)) 23 return false; 24 25 return guc->submission_selected; 26 } 27 28 void intel_guc_rc_init_early(struct intel_guc *guc) 29 { 30 guc->rc_supported = __guc_rc_supported(guc); 31 guc->rc_selected = __guc_rc_selected(guc); 32 } 33 34 static int guc_action_control_gucrc(struct intel_guc *guc, bool enable) 35 { 36 u32 rc_mode = enable ? INTEL_GUCRC_FIRMWARE_CONTROL : 37 INTEL_GUCRC_HOST_CONTROL; 38 u32 action[] = { 39 INTEL_GUC_ACTION_SETUP_PC_GUCRC, 40 rc_mode 41 }; 42 int ret; 43 44 ret = intel_guc_send(guc, action, ARRAY_SIZE(action)); 45 ret = ret > 0 ? -EPROTO : ret; 46 47 return ret; 48 } 49 50 static int __guc_rc_control(struct intel_guc *guc, bool enable) 51 { 52 struct intel_gt *gt = guc_to_gt(guc); 53 int ret; 54 55 if (!intel_uc_uses_guc_rc(>->uc)) 56 return -EOPNOTSUPP; 57 58 if (!intel_guc_is_ready(guc)) 59 return -EINVAL; 60 61 ret = guc_action_control_gucrc(guc, enable); 62 if (ret) { 63 guc_probe_error(guc, "Failed to %s RC (%pe)\n", 64 str_enable_disable(enable), ERR_PTR(ret)); 65 return ret; 66 } 67 68 guc_info(guc, "RC %s\n", str_enabled_disabled(enable)); 69 70 return 0; 71 } 72 73 int intel_guc_rc_enable(struct intel_guc *guc) 74 { 75 return __guc_rc_control(guc, true); 76 } 77 78 int intel_guc_rc_disable(struct intel_guc *guc) 79 { 80 return __guc_rc_control(guc, false); 81 } 82