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Commit bcfdf8af authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Greg Kroah-Hartman
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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: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 59be422e

drivers/hwtracing/stm/dummy_stm.c

+48 −9
Original line number Diff line number Diff line
@@ -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);