cregit-Linux how code gets into the kernel

Release 4.14 drivers/hwtracing/stm/dummy_stm.c

 * A dummy STM device for stm/stm_source class testing.
 * Copyright (c) 2014, 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.
 * STM class implements generic infrastructure for  System Trace Module devices
 * as defined in MIPI STPv2 specification.

#undef DEBUG
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/stm.h>

static ssize_t notrace dummy_stm_packet(struct stm_data *stm_data, unsigned int master, unsigned int channel, unsigned int packet, unsigned int flags, unsigned int size, const unsigned char *payload) { #ifdef DEBUG u64 pl = 0; if (payload) pl = *(u64 *)payload; if (size < 8) pl &= (1ull << (size * 8)) - 1; trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel, packet, size, pl); #endif return size; }


Alexander Shishkin9898.99%150.00%
Chunyan Zhang11.01%150.00%

#define DUMMY_STM_MAX 32 static struct stm_data dummy_stm[DUMMY_STM_MAX]; static int nr_dummies = 4; module_param(nr_dummies, int, 0400); static unsigned int fail_mode; module_param(fail_mode, int, 0600);
static int dummy_stm_link(struct stm_data *data, unsigned int master, unsigned int channel) { if (fail_mode && (channel & fail_mode)) return -EINVAL; return 0; }


Alexander Shishkin36100.00%1100.00%

static int dummy_stm_init(void) { int i, ret = -ENOMEM; if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX) return -EINVAL; for (i = 0; i < nr_dummies; i++) { dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i); if (!dummy_stm[i].name) goto fail_unregister; dummy_stm[i].sw_start = 0x0000; dummy_stm[i].sw_end = 0xffff; dummy_stm[i].sw_nchannels = 0xffff; dummy_stm[i].packet = dummy_stm_packet; dummy_stm[i].link = dummy_stm_link; ret = stm_register_device(NULL, &dummy_stm[i], THIS_MODULE); if (ret) goto fail_free; } return 0; fail_unregister: for (i--; i >= 0; i--) { stm_unregister_device(&dummy_stm[i]); fail_free: kfree(dummy_stm[i].name); } return ret; }


Alexander Shishkin184100.00%4100.00%

static void dummy_stm_exit(void) { int i; for (i = 0; i < nr_dummies; i++) { stm_unregister_device(&dummy_stm[i]); kfree(dummy_stm[i].name); } }


Alexander Shishkin45100.00%3100.00%

module_init(dummy_stm_init); module_exit(dummy_stm_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("dummy_stm device"); MODULE_AUTHOR("Alexander Shishkin <>");

Overall Contributors

Alexander Shishkin44599.78%480.00%
Chunyan Zhang10.22%120.00%
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