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stm class: Make dummy's master/channel ranges configurable 

To allow for more flexible testing of the stm class, make it possible
to specify the ranges of masters and channels that the dummy_stm devices
cover. This is done via module parameters.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
This commit is contained in:
Alexander Shishkin 2018-02-23 13:19:43 +02:00
parent 9ea393d8d8
commit 4f0c7c6a12
2 changed files with 25 additions and 3 deletions
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24
drivers/hwtracing/stm/dummy_stm.c
View File

@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/stm.h>
#include <uapi/linux/stm.h>
static ssize_t notrace
dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
@ -44,6 +45,18 @@ static unsigned int fail_mode;
module_param(fail_mode, int, 0600);
static unsigned int master_min;
module_param(master_min, int, 0400);
static unsigned int master_max = STP_MASTER_MAX;
module_param(master_max, int, 0400);
static unsigned int nr_channels = STP_CHANNEL_MAX;
module_param(nr_channels, int, 0400);
static int dummy_stm_link(struct stm_data *data, unsigned int master,
unsigned int channel)
{
@ -60,14 +73,19 @@ static int dummy_stm_init(void)
if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX)
return -EINVAL;
if (master_min > master_max ||
master_max > STP_MASTER_MAX ||
nr_channels > STP_CHANNEL_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].sw_start = master_min;
dummy_stm[i].sw_end = master_max;
dummy_stm[i].sw_nchannels = nr_channels;
dummy_stm[i].packet = dummy_stm_packet;
dummy_stm[i].link = dummy_stm_link;

4
include/uapi/linux/stm.h
View File

@ -12,6 +12,10 @@
#include <linux/types.h>
/* Maximum allowed master and channel values */
#define STP_MASTER_MAX 0xffff
#define STP_CHANNEL_MAX 0xffff
/**
* struct stp_policy_id - identification for the STP policy
* @size: size of the structure including real id[] length