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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* ISHTP client logic
*
* Copyright (c) 2003-2016, Intel Corporation.
*/
#ifndef _ISHTP_CLIENT_H_
#define _ISHTP_CLIENT_H_
#include <linux/types.h>
#include "ishtp-dev.h"
/* Tx and Rx ring size */
#define CL_DEF_RX_RING_SIZE 2
#define CL_DEF_TX_RING_SIZE 2
#define CL_MAX_RX_RING_SIZE 32
#define CL_MAX_TX_RING_SIZE 32
#define DMA_SLOT_SIZE 4096
/* Number of IPC fragments after which it's worth sending via DMA */
#define DMA_WORTH_THRESHOLD 3
/* DMA/IPC Tx paths. Other the default means enforcement */
#define CL_TX_PATH_DEFAULT 0
#define CL_TX_PATH_IPC 1
#define CL_TX_PATH_DMA 2
/* Client Tx buffer list entry */
struct ishtp_cl_tx_ring {
struct list_head list;
struct ishtp_msg_data send_buf;
};
/* ISHTP client instance */
struct ishtp_cl {
struct list_head link;
struct ishtp_device *dev;
enum cl_state state;
int status;
/* Link to ISHTP bus device */
struct ishtp_cl_device *device;
/* ID of client connected */
uint8_t host_client_id;
uint8_t fw_client_id;
uint8_t ishtp_flow_ctrl_creds;
uint8_t out_flow_ctrl_creds;
/* dma */
int last_tx_path;
/* 0: ack wasn't received,1:ack was received */
int last_dma_acked;
unsigned char *last_dma_addr;
/* 0: ack wasn't received,1:ack was received */
int last_ipc_acked;
/* Rx ring buffer pool */
unsigned int rx_ring_size;
struct ishtp_cl_rb free_rb_list;
spinlock_t free_list_spinlock;
/* Rx in-process list */
struct ishtp_cl_rb in_process_list;
spinlock_t in_process_spinlock;
/* Client Tx buffers list */
unsigned int tx_ring_size;
struct ishtp_cl_tx_ring tx_list, tx_free_list;
int tx_ring_free_size;
spinlock_t tx_list_spinlock;
spinlock_t tx_free_list_spinlock;
size_t tx_offs; /* Offset in buffer at head of 'tx_list' */
/**
* if we get a FC, and the list is not empty, we must know whether we
* are at the middle of sending.
* if so -need to increase FC counter, otherwise, need to start sending
* the first msg in list
* (!)This is for counting-FC implementation only. Within single-FC the
* other party may NOT send FC until it receives complete message
*/
int sending;
/* Send FC spinlock */
spinlock_t fc_spinlock;
/* wait queue for connect and disconnect response from FW */
wait_queue_head_t wait_ctrl_res;
/* Error stats */
unsigned int err_send_msg;
unsigned int err_send_fc;
/* Send/recv stats */
unsigned int send_msg_cnt_ipc;
unsigned int send_msg_cnt_dma;
unsigned int recv_msg_cnt_ipc;
unsigned int recv_msg_cnt_dma;
unsigned int recv_msg_num_frags;
unsigned int ishtp_flow_ctrl_cnt;
unsigned int out_flow_ctrl_cnt;
/* Rx msg ... out FC timing */
ktime_t ts_rx;
ktime_t ts_out_fc;
ktime_t ts_max_fc_delay;
void *client_data;
};
/* Client connection managenment internal functions */
int ishtp_can_client_connect(struct ishtp_device *ishtp_dev, guid_t *uuid);
int ishtp_fw_cl_by_id(struct ishtp_device *dev, uint8_t client_id);
void ishtp_cl_send_msg(struct ishtp_device *dev, struct ishtp_cl *cl);
void recv_ishtp_cl_msg(struct ishtp_device *dev,
struct ishtp_msg_hdr *ishtp_hdr);
int ishtp_cl_read_start(struct ishtp_cl *cl);
/* Ring Buffer I/F */
int ishtp_cl_alloc_rx_ring(struct ishtp_cl *cl);
int ishtp_cl_alloc_tx_ring(struct ishtp_cl *cl);
void ishtp_cl_free_rx_ring(struct ishtp_cl *cl);
void ishtp_cl_free_tx_ring(struct ishtp_cl *cl);
int ishtp_cl_get_tx_free_buffer_size(struct ishtp_cl *cl);
int ishtp_cl_get_tx_free_rings(struct ishtp_cl *cl);
/* DMA I/F functions */
void recv_ishtp_cl_msg_dma(struct ishtp_device *dev, void *msg,
struct dma_xfer_hbm *hbm);
void ishtp_cl_alloc_dma_buf(struct ishtp_device *dev);
void ishtp_cl_free_dma_buf(struct ishtp_device *dev);
void *ishtp_cl_get_dma_send_buf(struct ishtp_device *dev,
uint32_t size);
void ishtp_cl_release_dma_acked_mem(struct ishtp_device *dev,
void *msg_addr,
uint8_t size);
/* Request blocks alloc/free I/F */
struct ishtp_cl_rb *ishtp_io_rb_init(struct ishtp_cl *cl);
void ishtp_io_rb_free(struct ishtp_cl_rb *priv_rb);
int ishtp_io_rb_alloc_buf(struct ishtp_cl_rb *rb, size_t length);
/**
* ishtp_cl_cmp_id - tells if file private data have same id
* returns true - if ids are the same and not NULL
*/
static inline bool ishtp_cl_cmp_id(const struct ishtp_cl *cl1,
const struct ishtp_cl *cl2)
{
return cl1 && cl2 &&
(cl1->host_client_id == cl2->host_client_id) &&
(cl1->fw_client_id == cl2->fw_client_id);
}
#endif /* _ISHTP_CLIENT_H_ */
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