cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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iosm_ipc_port.c (2081B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2020-21 Intel Corporation.
      4 */
      5
      6#include "iosm_ipc_chnl_cfg.h"
      7#include "iosm_ipc_imem_ops.h"
      8#include "iosm_ipc_port.h"
      9
     10/* open logical channel for control communication */
     11static int ipc_port_ctrl_start(struct wwan_port *port)
     12{
     13	struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
     14	int ret = 0;
     15
     16	ipc_port->channel = ipc_imem_sys_port_open(ipc_port->ipc_imem,
     17						   ipc_port->chl_id,
     18						   IPC_HP_CDEV_OPEN);
     19	if (!ipc_port->channel)
     20		ret = -EIO;
     21
     22	return ret;
     23}
     24
     25/* close logical channel */
     26static void ipc_port_ctrl_stop(struct wwan_port *port)
     27{
     28	struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
     29
     30	ipc_imem_sys_port_close(ipc_port->ipc_imem, ipc_port->channel);
     31}
     32
     33/* transfer control data to modem */
     34static int ipc_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
     35{
     36	struct iosm_cdev *ipc_port = wwan_port_get_drvdata(port);
     37
     38	return ipc_imem_sys_cdev_write(ipc_port, skb);
     39}
     40
     41static const struct wwan_port_ops ipc_wwan_ctrl_ops = {
     42	.start = ipc_port_ctrl_start,
     43	.stop = ipc_port_ctrl_stop,
     44	.tx = ipc_port_ctrl_tx,
     45};
     46
     47/* Port init func */
     48struct iosm_cdev *ipc_port_init(struct iosm_imem *ipc_imem,
     49				struct ipc_chnl_cfg ipc_port_cfg)
     50{
     51	struct iosm_cdev *ipc_port = kzalloc(sizeof(*ipc_port), GFP_KERNEL);
     52	enum wwan_port_type port_type = ipc_port_cfg.wwan_port_type;
     53	enum ipc_channel_id chl_id = ipc_port_cfg.id;
     54
     55	if (!ipc_port)
     56		return NULL;
     57
     58	ipc_port->dev = ipc_imem->dev;
     59	ipc_port->pcie = ipc_imem->pcie;
     60
     61	ipc_port->port_type = port_type;
     62	ipc_port->chl_id = chl_id;
     63	ipc_port->ipc_imem = ipc_imem;
     64
     65	ipc_port->iosm_port = wwan_create_port(ipc_port->dev, port_type,
     66					       &ipc_wwan_ctrl_ops, ipc_port);
     67
     68	return ipc_port;
     69}
     70
     71/* Port deinit func */
     72void ipc_port_deinit(struct iosm_cdev *port[])
     73{
     74	struct iosm_cdev *ipc_port;
     75	u8 ctrl_chl_nr;
     76
     77	for (ctrl_chl_nr = 0; ctrl_chl_nr < IPC_MEM_MAX_CHANNELS;
     78	     ctrl_chl_nr++) {
     79		if (port[ctrl_chl_nr]) {
     80			ipc_port = port[ctrl_chl_nr];
     81			wwan_remove_port(ipc_port->iosm_port);
     82			kfree(ipc_port);
     83		}
     84	}
     85}