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* ISHTP client logic
*
* Copyright (c) 2003-2016, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include "hbm.h"
#include "client.h"
/**
* ishtp_read_list_flush() - Flush read queue
* @cl: ishtp client instance
*
* Used to remove all entries from read queue for a client
*/
static void ishtp_read_list_flush(struct ishtp_cl *cl)
{
struct ishtp_cl_rb *rb;
struct ishtp_cl_rb *next;
unsigned long flags;
spin_lock_irqsave(&cl->dev->read_list_spinlock, flags);
list_for_each_entry_safe(rb, next, &cl->dev->read_list.list, list)
if (rb->cl && ishtp_cl_cmp_id(cl, rb->cl)) {
list_del(&rb->list);
ishtp_io_rb_free(rb);
}
spin_unlock_irqrestore(&cl->dev->read_list_spinlock, flags);
}
/**
* ishtp_cl_flush_queues() - Flush all queues for a client
* @cl: ishtp client instance
*
* Used to remove all queues for a client. This is called when a client device
* needs reset due to error, S3 resume or during module removal
*
* Return: 0 on success else -EINVAL if device is NULL
*/
int ishtp_cl_flush_queues(struct ishtp_cl *cl)
{
if (WARN_ON(!cl || !cl->dev))
return -EINVAL;
ishtp_read_list_flush(cl);
return 0;
}
EXPORT_SYMBOL(ishtp_cl_flush_queues);
/**
* ishtp_cl_init() - Initialize all fields of a client device
* @cl: ishtp client instance
* @dev: ishtp device
*
* Initializes a client device fields: Init spinlocks, init queues etc.
* This function is called during new client creation
*/
static void ishtp_cl_init(struct ishtp_cl *cl, struct ishtp_device *dev)
{
memset(cl, 0, sizeof(struct ishtp_cl));
init_waitqueue_head(&cl->wait_ctrl_res);
spin_lock_init(&cl->free_list_spinlock);
spin_lock_init(&cl->in_process_spinlock);
spin_lock_init(&cl->tx_list_spinlock);
spin_lock_init(&cl->tx_free_list_spinlock);
spin_lock_init(&cl->fc_spinlock);
INIT_LIST_HEAD(&cl->link);
cl->dev = dev;
INIT_LIST_HEAD(&cl->free_rb_list.list);
INIT_LIST_HEAD(&cl->tx_list.list);
INIT_LIST_HEAD(&cl->tx_free_list.list);
INIT_LIST_HEAD(&cl->in_process_list.list);
cl->rx_ring_size = CL_DEF_RX_RING_SIZE;
cl->tx_ring_size = CL_DEF_TX_RING_SIZE;
/* dma */
cl->last_tx_path = CL_TX_PATH_IPC;
cl->last_dma_acked = 1;
cl->last_dma_addr = NULL;
cl->last_ipc_acked = 1;
}
/**
* ishtp_cl_allocate() - allocates client structure and sets it up.
* @dev: ishtp device
*
* Allocate memory for new client device and call to initialize each field.
*
* Return: The allocated client instance or NULL on failure
*/
struct ishtp_cl *ishtp_cl_allocate(struct ishtp_device *dev)
{
struct ishtp_cl *cl;
cl = kmalloc(sizeof(struct ishtp_cl), GFP_KERNEL);
if (!cl)
return NULL;
ishtp_cl_init(cl, dev);
return cl;
}
EXPORT_SYMBOL(ishtp_cl_allocate);
/**
* ishtp_cl_free() - Frees a client device
* @cl: client device instance
*
* Frees a client device
*/
void ishtp_cl_free(struct ishtp_cl *cl)
{
struct ishtp_device *dev;
unsigned long flags;
if (!cl)
return;
dev = cl->dev;
if (!dev)
return;
spin_lock_irqsave(&dev->cl_list_lock, flags);
ishtp_cl_free_rx_ring(cl);
ishtp_cl_free_tx_ring(cl);
kfree(cl);
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
}
EXPORT_SYMBOL(ishtp_cl_free);
/**
* ishtp_cl_link() - Reserve a host id and link the client instance
* @cl: client device instance
* @id: host client id to use. It can be ISHTP_HOST_CLIENT_ID_ANY if any
* id from the available can be used
*
*
* This allocates a single bit in the hostmap. This function will make sure
* that not many client sessions are opened at the same time. Once allocated
* the client device instance is added to the ishtp device in the current
* client list
*
* Return: 0 or error code on failure
*/
int ishtp_cl_link(struct ishtp_cl *cl, int id)
{
struct ishtp_device *dev;
unsigned long flags, flags_cl;
int ret = 0;
if (WARN_ON(!cl || !cl->dev))
return -EINVAL;
dev = cl->dev;
spin_lock_irqsave(&dev->device_lock, flags);
if (dev->open_handle_count >= ISHTP_MAX_OPEN_HANDLE_COUNT) {
ret = -EMFILE;
goto unlock_dev;
}
/* If Id is not assigned get one*/
if (id == ISHTP_HOST_CLIENT_ID_ANY)
id = find_first_zero_bit(dev->host_clients_map,
ISHTP_CLIENTS_MAX);
if (id >= ISHTP_CLIENTS_MAX) {
spin_unlock_irqrestore(&dev->device_lock, flags);
dev_err(&cl->device->dev, "id exceeded %d", ISHTP_CLIENTS_MAX);
return -ENOENT;
}
dev->open_handle_count++;
cl->host_client_id = id;
spin_lock_irqsave(&dev->cl_list_lock, flags_cl);
if (dev->dev_state != ISHTP_DEV_ENABLED) {
ret = -ENODEV;
goto unlock_cl;
}
list_add_tail(&cl->link, &dev->cl_list);
set_bit(id, dev->host_clients_map);
cl->state = ISHTP_CL_INITIALIZING;
unlock_cl:
spin_unlock_irqrestore(&dev->cl_list_lock, flags_cl);
unlock_dev:
spin_unlock_irqrestore(&dev->device_lock, flags);
return ret;
}
EXPORT_SYMBOL(ishtp_cl_link);
/**
* ishtp_cl_unlink() - remove fw_cl from the client device list
* @cl: client device instance
*
* Remove a previously linked device to a ishtp device
*/
void ishtp_cl_unlink(struct ishtp_cl *cl)
{
struct ishtp_device *dev;
struct ishtp_cl *pos;
unsigned long flags;
/* don't shout on error exit path */
if (!cl || !cl->dev)
return;
dev = cl->dev;
spin_lock_irqsave(&dev->device_lock, flags);
if (dev->open_handle_count > 0) {
clear_bit(cl->host_client_id, dev->host_clients_map);
dev->open_handle_count--;
}
spin_unlock_irqrestore(&dev->device_lock, flags);
/*
* This checks that 'cl' is actually linked into device's structure,
* before attempting 'list_del'
*/
spin_lock_irqsave(&dev->cl_list_lock, flags);
list_for_each_entry(pos, &dev->cl_list, link)
if (cl->host_client_id == pos->host_client_id) {
list_del_init(&pos->link);
break;
}
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
}
EXPORT_SYMBOL(ishtp_cl_unlink);
/**
* ishtp_cl_disconnect() - Send disconnect request to firmware
* @cl: client device instance
*
* Send a disconnect request for a client to firmware.
*
* Return: 0 if successful disconnect response from the firmware or error
* code on failure
*/
int ishtp_cl_disconnect(struct ishtp_cl *cl)
{
struct ishtp_device *dev;
int err;
if (WARN_ON(!cl || !cl->dev))
return -ENODEV;
dev = cl->dev;
dev->print_log(dev, "%s() state %d\n", __func__, cl->state);
if (cl->state != ISHTP_CL_DISCONNECTING) {
dev->print_log(dev, "%s() Disconnect in progress\n", __func__);
return 0;
}
if (ishtp_hbm_cl_disconnect_req(dev, cl)) {
dev->print_log(dev, "%s() Failed to disconnect\n", __func__);
dev_err(&cl->device->dev, "failed to disconnect.\n");
return -ENODEV;
}
err = wait_event_interruptible_timeout(cl->wait_ctrl_res,
(dev->dev_state != ISHTP_DEV_ENABLED ||
cl->state == ISHTP_CL_DISCONNECTED),
ishtp_secs_to_jiffies(ISHTP_CL_CONNECT_TIMEOUT));
/*
* If FW reset arrived, this will happen. Don't check cl->,
* as 'cl' may be freed already
*/
if (dev->dev_state != ISHTP_DEV_ENABLED) {
dev->print_log(dev, "%s() dev_state != ISHTP_DEV_ENABLED\n",
__func__);
return -ENODEV;
}
if (cl->state == ISHTP_CL_DISCONNECTED) {
dev->print_log(dev, "%s() successful\n", __func__);
return 0;
}
return -ENODEV;
}
EXPORT_SYMBOL(ishtp_cl_disconnect);
/**
* ishtp_cl_is_other_connecting() - Check other client is connecting
* @cl: client device instance
*
* Checks if other client with the same fw client id is connecting
*
* Return: true if other client is connected else false
*/
static bool ishtp_cl_is_other_connecting(struct ishtp_cl *cl)
{
struct ishtp_device *dev;
struct ishtp_cl *pos;
unsigned long flags;
if (WARN_ON(!cl || !cl->dev))
return false;
dev = cl->dev;
spin_lock_irqsave(&dev->cl_list_lock, flags);
list_for_each_entry(pos, &dev->cl_list, link) {
if ((pos->state == ISHTP_CL_CONNECTING) && (pos != cl) &&
cl->fw_client_id == pos->fw_client_id) {
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
return true;
}
}
spin_unlock_irqrestore(&dev->cl_list_lock, flags);
return false;
}
/**
* ishtp_cl_connect() - Send connect request to firmware
* @cl: client device instance
*
* Send a connect request for a client to firmware. If successful it will
* RX and TX ring buffers
*
* Return: 0 if successful connect response from the firmware and able
* to bind and allocate ring buffers or error code on failure
*/
int ishtp_cl_connect(struct ishtp_cl *cl)
{
struct ishtp_device *dev;
int rets;
if (WARN_ON(!cl || !cl->dev))
return -ENODEV;
dev = cl->dev;
dev->print_log(dev, "%s() current_state = %d\n", __func__, cl->state);
if (ishtp_cl_is_other_connecting(cl)) {
dev->print_log(dev, "%s() Busy\n", __func__);
return -EBUSY;
}
if (ishtp_hbm_cl_connect_req(dev, cl)) {
dev->print_log(dev, "%s() HBM connect req fail\n", __func__);
return -ENODEV;
}
rets = wait_event_interruptible_timeout(cl->wait_ctrl_res,
(dev->dev_state == ISHTP_DEV_ENABLED &&
(cl->state == ISHTP_CL_CONNECTED ||
cl->state == ISHTP_CL_DISCONNECTED)),
ishtp_secs_to_jiffies(
ISHTP_CL_CONNECT_TIMEOUT));
/*
* If FW reset arrived, this will happen. Don't check cl->,
* as 'cl' may be freed already
*/
if (dev->dev_state != ISHTP_DEV_ENABLED) {
dev->print_log(dev, "%s() dev_state != ISHTP_DEV_ENABLED\n",
__func__);
return -EFAULT;
}
if (cl->state != ISHTP_CL_CONNECTED) {
dev->print_log(dev, "%s() state != ISHTP_CL_CONNECTED\n",
__func__);
return -EFAULT;
}
rets = cl->status;
if (rets) {
dev->print_log(dev, "%s() Invalid status\n", __func__);
return rets;
}
rets = ishtp_cl_device_bind(cl);
if (rets) {
dev->print_log(dev, "%s() Bind error\n", __func__);
ishtp_cl_disconnect(cl);
return rets;
}
rets = ishtp_cl_alloc_rx_ring(cl);
if (rets) {
dev->print_log(dev, "%s() Alloc RX ring failed\n", __func__);
/* if failed allocation, disconnect */
ishtp_cl_disconnect(cl);
return rets;
}
rets = ishtp_cl_alloc_tx_ring(cl);
if (rets) {
dev->print_log(dev, "%s() Alloc TX ring failed\n", __func__);
/* if failed allocation, disconnect */
ishtp_cl_free_rx_ring(cl);
ishtp_cl_disconnect(cl);
return rets;
}
/* Upon successful connection and allocation, emit flow-control */
rets = ishtp_cl_read_start(cl);
dev->print_log(dev, "%s() successful\n", __func__);
return rets;
}
EXPORT_SYMBOL(ishtp_cl_connect);
/**
* ishtp_cl_read_start() - Prepare to read client message
* @cl: client device instance
*
* Get a free buffer from pool of free read buffers and add to read buffer
* pool to add contents. Send a flow control request to firmware to be able
* send next message.
*
* Return: 0 if successful or error code on failure
*/
int ishtp_cl_read_start(struct ishtp_cl *cl)
{
struct ishtp_device *dev;
struct ishtp_cl_rb *rb;
int rets;
int i;
unsigned long flags;
unsigned long dev_flags;
if (WARN_ON(!cl || !cl->dev))
return -ENODEV;
dev = cl->dev;
if (cl->state != ISHTP_CL_CONNECTED)
return -ENODEV;
if (dev->dev_state != ISHTP_DEV_ENABLED)
return -ENODEV;
i = ishtp_fw_cl_by_id(dev, cl->fw_client_id);
if (i < 0) {
dev_err(&cl->device->dev, "no such fw client %d\n",
cl->fw_client_id);
return -ENODEV;
}
/* The current rb is the head of the free rb list */
spin_lock_irqsave(&cl->free_list_spinlock, flags);
if (list_empty(&cl->free_rb_list.list)) {
dev_warn(&cl->device->dev,
"[ishtp-ish] Rx buffers pool is empty\n");
rets = -ENOMEM;
rb = NULL;
spin_unlock_irqrestore(&cl->free_list_spinlock, flags);
goto out;
}
rb = list_entry(cl->free_rb_list.list.next, struct ishtp_cl_rb, list);
list_del_init(&rb->list);
spin_unlock_irqrestore(&cl->free_list_spinlock, flags);
rb->cl = cl;
rb->buf_idx = 0;
INIT_LIST_HEAD(&rb->list);
rets = 0;
/*
* This must be BEFORE sending flow control -
* response in ISR may come too fast...
*/
spin_lock_irqsave(&dev->read_list_spinlock, dev_flags);
list_add_tail(&rb->list, &dev->read_list.list);
spin_unlock_irqrestore(&dev->read_list_spinlock, dev_flags);
if (ishtp_hbm_cl_flow_control_req(dev, cl)) {
rets = -ENODEV;
goto out;
}
out:
/* if ishtp_hbm_cl_flow_control_req failed, return rb to free list */
if (rets && rb) {
spin_lock_irqsave(&dev->read_list_spinlock, dev_flags);
list_del(&rb->list);
spin_unlock_irqrestore(&dev->read_list_spinlock, dev_flags);
spin_lock_irqsave(&cl->free_list_spinlock, flags);
list_add_tail(&rb->list, &cl->free_rb_list.list);
spin_unlock_irqrestore(&cl->free_list_spinlock, flags);
}
return rets;
}
/**
* ishtp_cl_send() - Send a message to firmware
* @cl: client device instance
* @buf: message buffer
* @length: length of message
*
* If the client is correct state to send message, this function gets a buffer
* from tx ring buffers, copy the message data and call to send the message
* using ishtp_cl_send_msg()
*
* Return: 0 if successful or error code on failure
*/
int ishtp_cl_send(struct ishtp_cl *cl, uint8_t *buf, size_t length)
{
struct ishtp_device *dev;
int id;
struct ishtp_cl_tx_ring *cl_msg;
int have_msg_to_send = 0;
unsigned long tx_flags, tx_free_flags;
if (WARN_ON(!cl || !cl->dev))
return -ENODEV;
dev = cl->dev;
if (cl->state != ISHTP_CL_CONNECTED) {
++cl->err_send_msg;
return -EPIPE;
}
if (dev->dev_state != ISHTP_DEV_ENABLED) {
++cl->err_send_msg;
return -ENODEV;
}
/* Check if we have fw client device */
id = ishtp_fw_cl_by_id(dev, cl->fw_client_id);
if (id < 0) {
++cl->err_send_msg;
return -ENOENT;
}
if (length > dev->fw_clients[id].props.max_msg_length) {
++cl->err_send_msg;
return -EMSGSIZE;
}
/* No free bufs */
spin_lock_irqsave(&cl->tx_free_list_spinlock, tx_free_flags);
if (list_empty(&cl->tx_free_list.list)) {
spin_unlock_irqrestore(&cl->tx_free_list_spinlock,
tx_free_flags);
++cl->err_send_msg;
return -ENOMEM;
}
cl_msg = list_first_entry(&cl->tx_free_list.list,
struct ishtp_cl_tx_ring, list);
if (!cl_msg->send_buf.data) {
spin_unlock_irqrestore(&cl->tx_free_list_spinlock,
tx_free_flags);
return -EIO;
/* Should not happen, as free list is pre-allocated */
}
/*
* This is safe, as 'length' is already checked for not exceeding
* max ISHTP message size per client
*/
list_del_init(&cl_msg->list);
spin_unlock_irqrestore(&cl->tx_free_list_spinlock, tx_free_flags);
memcpy(cl_msg->send_buf.data, buf, length);
cl_msg->send_buf.size = length;
spin_lock_irqsave(&cl->tx_list_spinlock, tx_flags);
have_msg_to_send = !list_empty(&cl->tx_list.list);
list_add_tail(&cl_msg->list, &cl->tx_list.list);
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
if (!have_msg_to_send && cl->ishtp_flow_ctrl_creds > 0)
ishtp_cl_send_msg(dev, cl);
return 0;
}
EXPORT_SYMBOL(ishtp_cl_send);
/**
* ishtp_cl_read_complete() - read complete
* @rb: Pointer to client request block
*
* If the message is completely received call ishtp_cl_bus_rx_event()
* to process message
*/
static void ishtp_cl_read_complete(struct ishtp_cl_rb *rb)
{
unsigned long flags;
int schedule_work_flag = 0;
struct ishtp_cl *cl = rb->cl;
spin_lock_irqsave(&cl->in_process_spinlock, flags);
/*
* if in-process list is empty, then need to schedule
* the processing thread
*/
schedule_work_flag = list_empty(&cl->in_process_list.list);
list_add_tail(&rb->list, &cl->in_process_list.list);
spin_unlock_irqrestore(&cl->in_process_spinlock, flags);
if (schedule_work_flag)
ishtp_cl_bus_rx_event(cl->device);
}
/**
* ipc_tx_callback() - IPC tx callback function
* @prm: Pointer to client device instance
*
* Send message over IPC either first time or on callback on previous message
* completion
*/
static void ipc_tx_callback(void *prm)
{
struct ishtp_cl *cl = prm;
struct ishtp_cl_tx_ring *cl_msg;
size_t rem;
struct ishtp_device *dev = (cl ? cl->dev : NULL);
struct ishtp_msg_hdr ishtp_hdr;
unsigned long tx_flags, tx_free_flags;
unsigned char *pmsg;
if (!dev)
return;
/*
* Other conditions if some critical error has
* occurred before this callback is called
*/
if (dev->dev_state != ISHTP_DEV_ENABLED)
return;
if (cl->state != ISHTP_CL_CONNECTED)
return;
spin_lock_irqsave(&cl->tx_list_spinlock, tx_flags);
if (list_empty(&cl->tx_list.list)) {
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
return;
}
if (cl->ishtp_flow_ctrl_creds != 1 && !cl->sending) {
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
return;
}
if (!cl->sending) {
--cl->ishtp_flow_ctrl_creds;
cl->last_ipc_acked = 0;
cl->last_tx_path = CL_TX_PATH_IPC;
cl->sending = 1;
}
cl_msg = list_entry(cl->tx_list.list.next, struct ishtp_cl_tx_ring,
list);
rem = cl_msg->send_buf.size - cl->tx_offs;
ishtp_hdr.host_addr = cl->host_client_id;
ishtp_hdr.fw_addr = cl->fw_client_id;
ishtp_hdr.reserved = 0;
pmsg = cl_msg->send_buf.data + cl->tx_offs;
if (rem <= dev->mtu) {
ishtp_hdr.length = rem;
ishtp_hdr.msg_complete = 1;
cl->sending = 0;
list_del_init(&cl_msg->list); /* Must be before write */
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
/* Submit to IPC queue with no callback */
ishtp_write_message(dev, &ishtp_hdr, pmsg);
spin_lock_irqsave(&cl->tx_free_list_spinlock, tx_free_flags);
list_add_tail(&cl_msg->list, &cl->tx_free_list.list);
spin_unlock_irqrestore(&cl->tx_free_list_spinlock,
tx_free_flags);
} else {
/* Send IPC fragment */
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
cl->tx_offs += dev->mtu;
ishtp_hdr.length = dev->mtu;
ishtp_hdr.msg_complete = 0;
ishtp_send_msg(dev, &ishtp_hdr, pmsg, ipc_tx_callback, cl);
}
}
/**
* ishtp_cl_send_msg_ipc() -Send message using IPC
* @dev: ISHTP device instance
* @cl: Pointer to client device instance
*
* Send message over IPC not using DMA
*/
static void ishtp_cl_send_msg_ipc(struct ishtp_device *dev,
struct ishtp_cl *cl)
{
/* If last DMA message wasn't acked yet, leave this one in Tx queue */
if (cl->last_tx_path == CL_TX_PATH_DMA && cl->last_dma_acked == 0)
return;
cl->tx_offs = 0;
ipc_tx_callback(cl);
++cl->send_msg_cnt_ipc;
}
/**
* ishtp_cl_send_msg_dma() -Send message using DMA
* @dev: ISHTP device instance
* @cl: Pointer to client device instance
*
* Send message using DMA
*/
static void ishtp_cl_send_msg_dma(struct ishtp_device *dev,
struct ishtp_cl *cl)
{
struct ishtp_msg_hdr hdr;
struct dma_xfer_hbm dma_xfer;
unsigned char *msg_addr;
int off;
struct ishtp_cl_tx_ring *cl_msg;
unsigned long tx_flags, tx_free_flags;
/* If last IPC message wasn't acked yet, leave this one in Tx queue */
if (cl->last_tx_path == CL_TX_PATH_IPC && cl->last_ipc_acked == 0)
return;
spin_lock_irqsave(&cl->tx_list_spinlock, tx_flags);
if (list_empty(&cl->tx_list.list)) {
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
return;
}
cl_msg = list_entry(cl->tx_list.list.next, struct ishtp_cl_tx_ring,
list);
msg_addr = ishtp_cl_get_dma_send_buf(dev, cl_msg->send_buf.size);
if (!msg_addr) {
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
if (dev->transfer_path == CL_TX_PATH_DEFAULT)
ishtp_cl_send_msg_ipc(dev, cl);
return;
}
list_del_init(&cl_msg->list); /* Must be before write */
spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
--cl->ishtp_flow_ctrl_creds;
cl->last_dma_acked = 0;
cl->last_dma_addr = msg_addr;
cl->last_tx_path = CL_TX_PATH_DMA;
/* write msg to dma buf */
memcpy(msg_addr, cl_msg->send_buf.data, cl_msg->send_buf.size);
/* send dma_xfer hbm msg */
off = msg_addr - (unsigned char *)dev->ishtp_host_dma_tx_buf;
ishtp_hbm_hdr(&hdr, sizeof(struct dma_xfer_hbm));
dma_xfer.hbm = DMA_XFER;
dma_xfer.fw_client_id = cl->fw_client_id;
dma_xfer.host_client_id = cl->host_client_id;
dma_xfer.reserved = 0;
dma_xfer.msg_addr = dev->ishtp_host_dma_tx_buf_phys + off;
dma_xfer.msg_length = cl_msg->send_buf.size;
dma_xfer.reserved2 = 0;
ishtp_write_message(dev, &hdr, (unsigned char *)&dma_xfer);
spin_lock_irqsave(&cl->tx_free_list_spinlock, tx_free_flags);
list_add_tail(&cl_msg->list, &cl->tx_free_list.list);
spin_unlock_irqrestore(&cl->tx_free_list_spinlock, tx_free_flags);
++cl->send_msg_cnt_dma;
}
/**
* ishtp_cl_send_msg() -Send message using DMA or IPC
* @dev: ISHTP device instance
* @cl: Pointer to client device instance
*
* Send message using DMA or IPC based on transfer_path
*/
void ishtp_cl_send_msg(struct ishtp_device *dev, struct ishtp_cl *cl)
{
if (dev->transfer_path == CL_TX_PATH_DMA)
ishtp_cl_send_msg_dma(dev, cl);
else
ishtp_cl_send_msg_ipc(dev, cl);
}
/**
* recv_ishtp_cl_msg() -Receive client message
* @dev: ISHTP device instance
* @ishtp_hdr: Pointer to message header
*
* Receive and dispatch ISHTP client messages. This function executes in ISR
* context
*/
void recv_ishtp_cl_msg(struct ishtp_device *dev,
struct ishtp_msg_hdr *ishtp_hdr)
{
struct ishtp_cl *cl;
struct ishtp_cl_rb *rb;
struct ishtp_cl_rb *new_rb;
unsigned char *buffer = NULL;
struct ishtp_cl_rb *complete_rb = NULL;
unsigned long dev_flags;
unsigned long flags;
int rb_count;
if (ishtp_hdr->reserved) {
dev_err(dev->devc, "corrupted message header.\n");
goto eoi;
}
if (ishtp_hdr->length > IPC_PAYLOAD_SIZE) {
dev_err(dev->devc,
"ISHTP message length in hdr exceeds IPC MTU\n");
goto eoi;
}
spin_lock_irqsave(&dev->read_list_spinlock, dev_flags);
rb_count = -1;
list_for_each_entry(rb, &dev->read_list.list, list) {
++rb_count;
cl = rb->cl;
if (!cl || !(cl->host_client_id == ishtp_hdr->host_addr &&
cl->fw_client_id == ishtp_hdr->fw_addr) ||
!(cl->state == ISHTP_CL_CONNECTED))
continue;
/* If no Rx buffer is allocated, disband the rb */
if (rb->buffer.size == 0 || rb->buffer.data == NULL) {
spin_unlock_irqrestore(&dev->read_list_spinlock,
dev_flags);
dev_err(&cl->device->dev,
"Rx buffer is not allocated.\n");
list_del(&rb->list);
ishtp_io_rb_free(rb);
cl->status = -ENOMEM;
goto eoi;
}
/*
* If message buffer overflown (exceeds max. client msg
* size, drop message and return to free buffer.
* Do we need to disconnect such a client? (We don't send
* back FC, so communication will be stuck anyway)
*/
if (rb->buffer.size < ishtp_hdr->length + rb->buf_idx) {
spin_unlock_irqrestore(&dev->read_list_spinlock,
dev_flags);
dev_err(&cl->device->dev,
"message overflow. size %d len %d idx %ld\n",
rb->buffer.size, ishtp_hdr->length,
rb->buf_idx);
list_del(&rb->list);
ishtp_cl_io_rb_recycle(rb);
cl->status = -EIO;
goto eoi;
}
buffer = rb->buffer.data + rb->buf_idx;
dev->ops->ishtp_read(dev, buffer, ishtp_hdr->length);
rb->buf_idx += ishtp_hdr->length;
if (ishtp_hdr->msg_complete) {
/* Last fragment in message - it's complete */
cl->status = 0;
list_del(&rb->list);
complete_rb = rb;
--cl->out_flow_ctrl_creds;
/*
* the whole msg arrived, send a new FC, and add a new
* rb buffer for the next coming msg
*/
spin_lock_irqsave(&cl->free_list_spinlock, flags);
if (!list_empty(&cl->free_rb_list.list)) {
new_rb = list_entry(cl->free_rb_list.list.next,
struct ishtp_cl_rb, list);
list_del_init(&new_rb->list);
spin_unlock_irqrestore(&cl->free_list_spinlock,
flags);
new_rb->cl = cl;
new_rb->buf_idx = 0;
INIT_LIST_HEAD(&new_rb->list);
list_add_tail(&new_rb->list,
&dev->read_list.list);
ishtp_hbm_cl_flow_control_req(dev, cl);
} else {
spin_unlock_irqrestore(&cl->free_list_spinlock,
flags);
}
}
/* One more fragment in message (even if this was last) */
++cl->recv_msg_num_frags;
/*
* We can safely break here (and in BH too),
* a single input message can go only to a single request!
*/
break;
}
spin_unlock_irqrestore(&dev->read_list_spinlock, dev_flags);
/* If it's nobody's message, just read and discard it */
if (!buffer) {
uint8_t rd_msg_buf[ISHTP_RD_MSG_BUF_SIZE];
dev_err(dev->devc, "Dropped Rx msg - no request\n");
dev->ops->ishtp_read(dev, rd_msg_buf, ishtp_hdr->length);
goto eoi;
}
if (complete_rb) {
getnstimeofday(&cl->ts_rx);
++cl->recv_msg_cnt_ipc;
ishtp_cl_read_complete(complete_rb);
}
eoi:
return;
}
/**
* recv_ishtp_cl_msg_dma() -Receive client message
* @dev: ISHTP device instance
* @msg: message pointer
* @hbm: hbm buffer
*
* Receive and dispatch ISHTP client messages using DMA. This function executes
* in ISR context
*/
void recv_ishtp_cl_msg_dma(struct ishtp_device *dev, void *msg,
struct dma_xfer_hbm *hbm)
{
struct ishtp_cl *cl;
struct ishtp_cl_rb *rb;
struct ishtp_cl_rb *new_rb;
unsigned char *buffer = NULL;
struct ishtp_cl_rb *complete_rb = NULL;
unsigned long dev_flags;
unsigned long flags;
spin_lock_irqsave(&dev->read_list_spinlock, dev_flags);
list_for_each_entry(rb, &dev->read_list.list, list) {
cl = rb->cl;
if (!cl || !(cl->host_client_id == hbm->host_client_id &&
cl->fw_client_id == hbm->fw_client_id) ||
!(cl->state == ISHTP_CL_CONNECTED))
continue;
/*
* If no Rx buffer is allocated, disband the rb
*/
if (rb->buffer.size == 0 || rb->buffer.data == NULL) {
spin_unlock_irqrestore(&dev->read_list_spinlock,
dev_flags);
dev_err(&cl->device->dev,
"response buffer is not allocated.\n");
list_del(&rb->list);
ishtp_io_rb_free(rb);
cl->status = -ENOMEM;
goto eoi;
}
/*
* If message buffer overflown (exceeds max. client msg
* size, drop message and return to free buffer.
* Do we need to disconnect such a client? (We don't send
* back FC, so communication will be stuck anyway)
*/
if (rb->buffer.size < hbm->msg_length) {
spin_unlock_irqrestore(&dev->read_list_spinlock,
dev_flags);
dev_err(&cl->device->dev,
"message overflow. size %d len %d idx %ld\n",
rb->buffer.size, hbm->msg_length, rb->buf_idx);
list_del(&rb->list);
ishtp_cl_io_rb_recycle(rb);
cl->status = -EIO;
goto eoi;
}
buffer = rb->buffer.data;
memcpy(buffer, msg, hbm->msg_length);
rb->buf_idx = hbm->msg_length;
/* Last fragment in message - it's complete */
cl->status = 0;
list_del(&rb->list);
complete_rb = rb;
--cl->out_flow_ctrl_creds;
/*
* the whole msg arrived, send a new FC, and add a new
* rb buffer for the next coming msg
*/
spin_lock_irqsave(&cl->free_list_spinlock, flags);
if (!list_empty(&cl->free_rb_list.list)) {
new_rb = list_entry(cl->free_rb_list.list.next,
struct ishtp_cl_rb, list);
list_del_init(&new_rb->list);
spin_unlock_irqrestore(&cl->free_list_spinlock,
flags);
new_rb->cl = cl;
new_rb->buf_idx = 0;
INIT_LIST_HEAD(&new_rb->list);
list_add_tail(&new_rb->list,
&dev->read_list.list);
ishtp_hbm_cl_flow_control_req(dev, cl);
} else {
spin_unlock_irqrestore(&cl->free_list_spinlock,
flags);
}
/* One more fragment in message (this is always last) */
++cl->recv_msg_num_frags;
/*
* We can safely break here (and in BH too),
* a single input message can go only to a single request!
*/
break;
}
spin_unlock_irqrestore(&dev->read_list_spinlock, dev_flags);
/* If it's nobody's message, just read and discard it */
if (!buffer) {
dev_err(dev->devc, "Dropped Rx (DMA) msg - no request\n");
goto eoi;
}
if (complete_rb) {
getnstimeofday(&cl->ts_rx);
++cl->recv_msg_cnt_dma;
ishtp_cl_read_complete(complete_rb);
}
eoi:
return;
}
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