1 /* SPDX-License-Identifier: MIT */
3 * Copyright © 2016-2019 Intel Corporation
6 #ifndef _INTEL_GUC_CT_H_
7 #define _INTEL_GUC_CT_H_
9 #include <linux/interrupt.h>
10 #include <linux/spinlock.h>
11 #include <linux/workqueue.h>
13 #include "intel_guc_fwif.h"
19 * DOC: Command Transport (CT).
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.
25 /** Represents single command transport buffer.
27 * A single command transport buffer consists of two parts, the header
28 * record (command transport buffer descriptor) and the actual buffer which
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
36 struct intel_guc_ct_buffer {
38 struct guc_ct_buffer_desc *desc;
44 /** Top-level structure for Command Transport related data
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.
53 /* buffers for sending and receiving commands */
55 struct intel_guc_ct_buffer send;
56 struct intel_guc_ct_buffer recv;
59 struct tasklet_struct receive_tasklet;
62 u32 last_fence; /* last fence used to send request */
64 spinlock_t lock; /* protects pending requests list */
65 struct list_head pending; /* requests waiting for response */
67 struct list_head incoming; /* incoming requests */
68 struct work_struct worker; /* handler for incoming requests */
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);
78 static inline void intel_guc_ct_sanitize(struct intel_guc_ct *ct)
83 static inline bool intel_guc_ct_enabled(struct intel_guc_ct *ct)
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);
92 #endif /* _INTEL_GUC_CT_H_ */