From bcfdf8afdebe63a2217fa632ae94f8aeecf9126f Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Mon, 15 Feb 2016 19:12:03 +0200 Subject: [PATCH] stm class: dummy_stm: Create multiple devices STM framework should be able to handle multiple STM devices at a time, each one with its own master allocation policy. This patch changes dummy_stm driver to create multiple STM sinks to help testing the framework. Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman --- drivers/hwtracing/stm/dummy_stm.c | 57 ++++++++++++++++++++++++++----- 1 file changed, 48 insertions(+), 9 deletions(-) diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c index 3709bef0b21f..4ff5961cd36f 100644 --- a/drivers/hwtracing/stm/dummy_stm.c +++ b/drivers/hwtracing/stm/dummy_stm.c @@ -40,22 +40,61 @@ dummy_stm_packet(struct stm_data *stm_data, unsigned int master, return size; } -static struct stm_data dummy_stm = { - .name = "dummy_stm", - .sw_start = 0x0000, - .sw_end = 0xffff, - .sw_nchannels = 0xffff, - .packet = dummy_stm_packet, -}; +#define DUMMY_STM_MAX 32 + +static struct stm_data dummy_stm[DUMMY_STM_MAX]; + +static int nr_dummies = 4; + +module_param(nr_dummies, int, 0600); + +static unsigned int dummy_stm_nr; static int dummy_stm_init(void) { - return stm_register_device(NULL, &dummy_stm, THIS_MODULE); + int i, ret = -ENOMEM, __nr_dummies = ACCESS_ONCE(nr_dummies); + + 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; + + ret = stm_register_device(NULL, &dummy_stm[i], THIS_MODULE); + if (ret) + goto fail_free; + } + + dummy_stm_nr = __nr_dummies; + + return 0; + +fail_unregister: + for (i--; i >= 0; i--) { + stm_unregister_device(&dummy_stm[i]); +fail_free: + kfree(dummy_stm[i].name); + } + + return ret; + } static void dummy_stm_exit(void) { - stm_unregister_device(&dummy_stm); + int i; + + for (i = 0; i < dummy_stm_nr; i++) { + stm_unregister_device(&dummy_stm[i]); + kfree(dummy_stm[i].name); + } } module_init(dummy_stm_init); -- 2.20.1