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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 next_fence; /* fence to be used with next request to send */ 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 : 0 : static inline bool intel_guc_ct_enabled(struct intel_guc_ct *ct) 69 : : { 70 [ # # ]: 0 : return ct->enabled; 71 : : } 72 : : 73 : : int intel_guc_ct_send(struct intel_guc_ct *ct, const u32 *action, u32 len, 74 : : u32 *response_buf, u32 response_buf_size); 75 : : void intel_guc_ct_event_handler(struct intel_guc_ct *ct); 76 : : 77 : : #endif /* _INTEL_GUC_CT_H_ */