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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;
};
/** Top-level structure for Command Transport related data
*
* Includes a pair of CT buffers for bi-directional communication and tracking
* for the H2G and G2H requests sent and received through the buffers.
*/
struct intel_guc_ct {
struct i915_vma *vma;
bool enabled;
/* buffers for sending(0) and receiving(1) commands */
struct intel_guc_ct_buffer ctbs[2];
struct {
u32 next_fence; /* fence to be used with next request to send */
spinlock_t lock; /* protects pending requests list */
struct list_head pending; /* requests waiting for response */
struct list_head incoming; /* incoming requests */
struct work_struct worker; /* handler for incoming requests */
} requests;
};
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 bool intel_guc_ct_enabled(struct intel_guc_ct *ct)
{
return ct->enabled;
}
int intel_guc_ct_send(struct intel_guc_ct *ct, const u32 *action, u32 len,
u32 *response_buf, u32 response_buf_size);
void intel_guc_ct_event_handler(struct intel_guc_ct *ct);
#endif /* _INTEL_GUC_CT_H_ */
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