1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2016-2019 Intel Corporation 4 */ 5 6 #ifndef _INTEL_GUC_CT_H_ 7 #define _INTEL_GUC_CT_H_ 8 9 #include <linux/spinlock.h> 10 #include <linux/workqueue.h> 11 12 #include "intel_guc_fwif.h" 13 14 struct i915_vma; 15 struct intel_guc; 16 17 /** 18 * DOC: Command Transport (CT). 19 * 20 * Buffer based command transport is a replacement for MMIO based mechanism. 21 * It can be used to perform both host-2-guc and guc-to-host communication. 22 */ 23 24 /** Represents single command transport buffer. 25 * 26 * A single command transport buffer consists of two parts, the header 27 * record (command transport buffer descriptor) and the actual buffer which 28 * holds the commands. 29 * 30 * @desc: pointer to the buffer descriptor 31 * @cmds: pointer to the commands buffer 32 */ 33 struct intel_guc_ct_buffer { 34 struct guc_ct_buffer_desc *desc; 35 u32 *cmds; 36 }; 37 38 39 /** Top-level structure for Command Transport related data 40 * 41 * Includes a pair of CT buffers for bi-directional communication and tracking 42 * for the H2G and G2H requests sent and received through the buffers. 43 */ 44 struct intel_guc_ct { 45 struct i915_vma *vma; 46 bool enabled; 47 48 /* buffers for sending(0) and receiving(1) commands */ 49 struct intel_guc_ct_buffer ctbs[2]; 50 51 struct { 52 u32 last_fence; /* last fence used to send request */ 53 54 spinlock_t lock; /* protects pending requests list */ 55 struct list_head pending; /* requests waiting for response */ 56 57 struct list_head incoming; /* incoming requests */ 58 struct work_struct worker; /* handler for incoming requests */ 59 } requests; 60 }; 61 62 void intel_guc_ct_init_early(struct intel_guc_ct *ct); 63 int intel_guc_ct_init(struct intel_guc_ct *ct); 64 void intel_guc_ct_fini(struct intel_guc_ct *ct); 65 int intel_guc_ct_enable(struct intel_guc_ct *ct); 66 void intel_guc_ct_disable(struct intel_guc_ct *ct); 67 68 static inline void intel_guc_ct_sanitize(struct intel_guc_ct *ct) 69 { 70 ct->enabled = false; 71 } 72 73 static inline bool intel_guc_ct_enabled(struct intel_guc_ct *ct) 74 { 75 return ct->enabled; 76 } 77 78 int intel_guc_ct_send(struct intel_guc_ct *ct, const u32 *action, u32 len, 79 u32 *response_buf, u32 response_buf_size); 80 void intel_guc_ct_event_handler(struct intel_guc_ct *ct); 81 82 #endif /* _INTEL_GUC_CT_H_ */ 83