1 /* $NetBSD: intel_guc_ct.h,v 1.2 2021/12/18 23:45:31 riastradh Exp $ */ 2 3 /* SPDX-License-Identifier: MIT */ 4 /* 5 * Copyright © 2016-2019 Intel Corporation 6 */ 7 8 #ifndef _INTEL_GUC_CT_H_ 9 #define _INTEL_GUC_CT_H_ 10 11 #include <linux/spinlock.h> 12 #include <linux/workqueue.h> 13 14 #include "intel_guc_fwif.h" 15 16 struct i915_vma; 17 struct intel_guc; 18 19 /** 20 * DOC: Command Transport (CT). 21 * 22 * Buffer based command transport is a replacement for MMIO based mechanism. 23 * It can be used to perform both host-2-guc and guc-to-host communication. 24 */ 25 26 /** Represents single command transport buffer. 27 * 28 * A single command transport buffer consists of two parts, the header 29 * record (command transport buffer descriptor) and the actual buffer which 30 * holds the commands. 31 * 32 * @desc: pointer to the buffer descriptor 33 * @cmds: pointer to the commands buffer 34 */ 35 struct intel_guc_ct_buffer { 36 struct guc_ct_buffer_desc *desc; 37 u32 *cmds; 38 }; 39 40 41 /** Top-level structure for Command Transport related data 42 * 43 * Includes a pair of CT buffers for bi-directional communication and tracking 44 * for the H2G and G2H requests sent and received through the buffers. 45 */ 46 struct intel_guc_ct { 47 struct i915_vma *vma; 48 bool enabled; 49 50 /* buffers for sending(0) and receiving(1) commands */ 51 struct intel_guc_ct_buffer ctbs[2]; 52 53 struct { 54 u32 next_fence; /* fence to be used with next request to send */ 55 56 spinlock_t lock; /* protects pending requests list */ 57 struct list_head pending; /* requests waiting for response */ 58 59 struct list_head incoming; /* incoming requests */ 60 struct work_struct worker; /* handler for incoming requests */ 61 } requests; 62 }; 63 64 void intel_guc_ct_init_early(struct intel_guc_ct *ct); 65 int intel_guc_ct_init(struct intel_guc_ct *ct); 66 void intel_guc_ct_fini(struct intel_guc_ct *ct); 67 int intel_guc_ct_enable(struct intel_guc_ct *ct); 68 void intel_guc_ct_disable(struct intel_guc_ct *ct); 69 intel_guc_ct_enabled(struct intel_guc_ct * ct)70static inline bool intel_guc_ct_enabled(struct intel_guc_ct *ct) 71 { 72 return ct->enabled; 73 } 74 75 int intel_guc_ct_send(struct intel_guc_ct *ct, const u32 *action, u32 len, 76 u32 *response_buf, u32 response_buf_size); 77 void intel_guc_ct_event_handler(struct intel_guc_ct *ct); 78 79 #endif /* _INTEL_GUC_CT_H_ */ 80