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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2018-02-23 14:19:43 +0300
committerAlexander Shishkin <alexander.shishkin@linux.intel.com>2018-03-28 18:47:18 +0300
commit4f0c7c6a12906e3571abb3c2b93eca8f727f4c9c (patch)
treec1059d2697ba34ee36bb5247a5e0908e3a289031 /drivers/hwtracing
parent9ea393d8d8377b6da8ee25c6a114ec24c0687c7c (diff)
downloadlinux-4f0c7c6a12906e3571abb3c2b93eca8f727f4c9c.tar.xz
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>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/stm/dummy_stm.c24
1 files changed, 21 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;