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Subject[GIT PULL 03/10] stm class: Make dummy's master/channel ranges configurable
Date
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>
---
drivers/hwtracing/stm/dummy_stm.c | 24 +++++++++++++++++++++---
include/uapi/linux/stm.h | 4 ++++
2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c
index 63288020ea5b..38528ffdc0b3 100644
--- a/drivers/hwtracing/stm/dummy_stm.c
+++ b/drivers/hwtracing/stm/dummy_stm.c
@@ -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;

diff --git a/include/uapi/linux/stm.h b/include/uapi/linux/stm.h
index 29c89be72275..7bac318b4440 100644
--- a/include/uapi/linux/stm.h
+++ b/include/uapi/linux/stm.h
@@ -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
--
2.16.2
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