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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rpmsg_client_sample.c (2282B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Remote processor messaging - sample client driver
      4 *
      5 * Copyright (C) 2011 Texas Instruments, Inc.
      6 * Copyright (C) 2011 Google, Inc.
      7 *
      8 * Ohad Ben-Cohen <ohad@wizery.com>
      9 * Brian Swetland <swetland@google.com>
     10 */
     11
     12#include <linux/kernel.h>
     13#include <linux/module.h>
     14#include <linux/rpmsg.h>
     15
     16#define MSG		"hello world!"
     17
     18static int count = 100;
     19module_param(count, int, 0644);
     20
     21struct instance_data {
     22	int rx_count;
     23};
     24
     25static int rpmsg_sample_cb(struct rpmsg_device *rpdev, void *data, int len,
     26						void *priv, u32 src)
     27{
     28	int ret;
     29	struct instance_data *idata = dev_get_drvdata(&rpdev->dev);
     30
     31	dev_info(&rpdev->dev, "incoming msg %d (src: 0x%x)\n",
     32		 ++idata->rx_count, src);
     33
     34	print_hex_dump_debug(__func__, DUMP_PREFIX_NONE, 16, 1, data, len,
     35			     true);
     36
     37	/* samples should not live forever */
     38	if (idata->rx_count >= count) {
     39		dev_info(&rpdev->dev, "goodbye!\n");
     40		return 0;
     41	}
     42
     43	/* send a new message now */
     44	ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
     45	if (ret)
     46		dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
     47
     48	return 0;
     49}
     50
     51static int rpmsg_sample_probe(struct rpmsg_device *rpdev)
     52{
     53	int ret;
     54	struct instance_data *idata;
     55
     56	dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
     57					rpdev->src, rpdev->dst);
     58
     59	idata = devm_kzalloc(&rpdev->dev, sizeof(*idata), GFP_KERNEL);
     60	if (!idata)
     61		return -ENOMEM;
     62
     63	dev_set_drvdata(&rpdev->dev, idata);
     64
     65	/* send a message to our remote processor */
     66	ret = rpmsg_send(rpdev->ept, MSG, strlen(MSG));
     67	if (ret) {
     68		dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
     69		return ret;
     70	}
     71
     72	return 0;
     73}
     74
     75static void rpmsg_sample_remove(struct rpmsg_device *rpdev)
     76{
     77	dev_info(&rpdev->dev, "rpmsg sample client driver is removed\n");
     78}
     79
     80static struct rpmsg_device_id rpmsg_driver_sample_id_table[] = {
     81	{ .name	= "rpmsg-client-sample" },
     82	{ },
     83};
     84MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_sample_id_table);
     85
     86static struct rpmsg_driver rpmsg_sample_client = {
     87	.drv.name	= KBUILD_MODNAME,
     88	.id_table	= rpmsg_driver_sample_id_table,
     89	.probe		= rpmsg_sample_probe,
     90	.callback	= rpmsg_sample_cb,
     91	.remove		= rpmsg_sample_remove,
     92};
     93module_rpmsg_driver(rpmsg_sample_client);
     94
     95MODULE_DESCRIPTION("Remote processor messaging sample client driver");
     96MODULE_LICENSE("GPL v2");