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/interrupt.h> 10 #include <linux/spinlock.h> 11 #include <linux/workqueue.h> 12 13 #include "intel_guc_fwif.h" 14 15 struct i915_vma; 16 struct intel_guc; 17 18 /** 19 * DOC: Command Transport (CT). 20 * 21 * Buffer based command transport is a replacement for MMIO based mechanism. 22 * It can be used to perform both host-2-guc and guc-to-host communication. 23 */ 24 25 /** Represents single command transport buffer. 26 * 27 * A single command transport buffer consists of two parts, the header 28 * record (command transport buffer descriptor) and the actual buffer which 29 * holds the commands. 30 * 31 * @lock: protects access to the commands buffer and buffer descriptor 32 * @desc: pointer to the buffer descriptor 33 * @cmds: pointer to the commands buffer 34 * @size: size of the commands buffer 35 */ 36 struct intel_guc_ct_buffer { 37 spinlock_t lock; 38 struct guc_ct_buffer_desc *desc; 39 u32 *cmds; 40 u32 size; 41 }; 42 43 44 /** Top-level structure for Command Transport related data 45 * 46 * Includes a pair of CT buffers for bi-directional communication and tracking 47 * for the H2G and G2H requests sent and received through the buffers. 48 */ 49 struct intel_guc_ct { 50 struct i915_vma *vma; 51 bool enabled; 52 53 /* buffers for sending and receiving commands */ 54 struct { 55 struct intel_guc_ct_buffer send; 56 struct intel_guc_ct_buffer recv; 57 } ctbs; 58 59 struct tasklet_struct receive_tasklet; 60 61 struct { 62 u32 last_fence; /* last fence used to send request */ 63 64 spinlock_t lock; /* protects pending requests list */ 65 struct list_head pending; /* requests waiting for response */ 66 67 struct list_head incoming; /* incoming requests */ 68 struct work_struct worker; /* handler for incoming requests */ 69 } requests; 70 }; 71 72 void intel_guc_ct_init_early(struct intel_guc_ct *ct); 73 int intel_guc_ct_init(struct intel_guc_ct *ct); 74 void intel_guc_ct_fini(struct intel_guc_ct *ct); 75 int intel_guc_ct_enable(struct intel_guc_ct *ct); 76 void intel_guc_ct_disable(struct intel_guc_ct *ct); 77 78 static inline void intel_guc_ct_sanitize(struct intel_guc_ct *ct) 79 { 80 ct->enabled = false; 81 } 82 83 static inline bool intel_guc_ct_enabled(struct intel_guc_ct *ct) 84 { 85 return ct->enabled; 86 } 87 88 int intel_guc_ct_send(struct intel_guc_ct *ct, const u32 *action, u32 len, 89 u32 *response_buf, u32 response_buf_size); 90 void intel_guc_ct_event_handler(struct intel_guc_ct *ct); 91 92 #endif /* _INTEL_GUC_CT_H_ */ 93