linux/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h

/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2016-2019 Intel Corporation
 */

#ifndef _INTEL_GUC_CT_H_
#define _INTEL_GUC_CT_H_

#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/stackdepot.h>
#include <linux/workqueue.h>
#include <linux/ktime.h>
#include <linux/wait.h>

#include "intel_guc_fwif.h"

struct i915_vma;
struct intel_guc;
struct drm_printer;

/**
 * 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.
 *
 * @lock: protects access to the commands buffer and buffer descriptor
 * @desc: pointer to the buffer descriptor
 * @cmds: pointer to the commands buffer
 * @size: size of the commands buffer in dwords
 * @resv_space: reserved space in buffer in dwords
 * @head: local shadow copy of head in dwords
 * @tail: local shadow copy of tail in dwords
 * @space: local shadow copy of space in dwords
 * @broken: flag to indicate if descriptor data is broken
 */
struct intel_guc_ct_buffer { … };

/** 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 { … };

long intel_guc_ct_max_queue_time_jiffies(void);

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_sanitize(struct intel_guc_ct *ct)
{ … }

static inline bool intel_guc_ct_enabled(struct intel_guc_ct *ct)
{ … }

#define INTEL_GUC_CT_SEND_NB …
#define INTEL_GUC_CT_SEND_G2H_DW_SHIFT …
#define INTEL_GUC_CT_SEND_G2H_DW_MASK …
#define MAKE_SEND_FLAGS(len) …
int intel_guc_ct_send(struct intel_guc_ct *ct, const u32 *action, u32 len,
		      u32 *response_buf, u32 response_buf_size, u32 flags);
void intel_guc_ct_event_handler(struct intel_guc_ct *ct);

void intel_guc_ct_print_info(struct intel_guc_ct *ct, struct drm_printer *p);

#endif /* _INTEL_GUC_CT_H_ */