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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2016-2019 Intel Corporation
*/
#ifndef _INTEL_GUC_CT_H_
#define _INTEL_GUC_CT_H_
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include "intel_guc_fwif.h"
struct i915_vma;
struct intel_guc;
/**
* DOC: Command Transport (CT).
*
* Buffer based command transport is a replacement for MMIO based mechanism.
* It can be used to perform both host-2-guc and guc-to-host communication.
*/
/** Represents single command transport buffer.
*
* A single command transport buffer consists of two parts, the header
* record (command transport buffer descriptor) and the actual buffer which
* holds the commands.
*
* @desc: pointer to the buffer descriptor
* @cmds: pointer to the commands buffer
*/
struct intel_guc_ct_buffer {
struct guc_ct_buffer_desc *desc;
u32 *cmds;
};
/** Represents pair of command transport buffers.
*
* Buffers go in pairs to allow bi-directional communication.
* To simplify the code we place both of them in the same vma.
* Buffers from the same pair must share unique owner id.
*
* @vma: pointer to the vma with pair of CT buffers
* @ctbs: buffers for sending(0) and receiving(1) commands
* @owner: unique identifier
* @next_fence: fence to be used with next send command
*/
struct intel_guc_ct_channel {
struct i915_vma *vma;
struct intel_guc_ct_buffer ctbs[2];
u32 owner;
u32 next_fence;
bool enabled;
};
/** Holds all command transport channels.
*
* @host_channel: main channel used by the host
*/
struct intel_guc_ct {
struct intel_guc_ct_channel host_channel;
/* other channels are tbd */
/** @lock: protects pending requests list */
spinlock_t lock;
/** @pending_requests: list of requests waiting for response */
struct list_head pending_requests;
/** @incoming_requests: list of incoming requests */
struct list_head incoming_requests;
/** @worker: worker for handling incoming requests */
struct work_struct worker;
};
void intel_guc_ct_init_early(struct intel_guc_ct *ct);
int intel_guc_ct_init(struct intel_guc_ct *ct);
void intel_guc_ct_fini(struct intel_guc_ct *ct);
int intel_guc_ct_enable(struct intel_guc_ct *ct);
void intel_guc_ct_disable(struct intel_guc_ct *ct);
static inline void intel_guc_ct_stop(struct intel_guc_ct *ct)
{
ct->host_channel.enabled = false;
}
int intel_guc_send_ct(struct intel_guc *guc, const u32 *action, u32 len,
u32 *response_buf, u32 response_buf_size);
void intel_guc_to_host_event_handler_ct(struct intel_guc *guc);
#endif /* _INTEL_GUC_CT_H_ */
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