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Commit 441ff248 authored by Sarang Joshi's avatar Sarang Joshi
Browse files

coresight: add device attribute for etr ddr mem size 



Add device attribute to control ETR DDR memory size dynamically
for TMC configuration. This will help users to specify DDR trace
buffer size at runtime.

Change-Id: Ie1edef7f972435193c96dafb8a94fd6cce97ce6c
Signed-off-by: default avatarSarang Joshi <spjoshi@codeaurora.org>
parent 4db175e5

drivers/coresight/coresight-tmc.c

+28 −0
Original line number Diff line number Diff line
@@ -177,6 +177,7 @@ struct tmc_drvdata { 
	bool			byte_cntr_read_active;

	wait_queue_head_t	wq;

	char			*byte_cntr_node;

	uint32_t		mem_size;

};



static void tmc_wait_for_flush(struct tmc_drvdata *drvdata)
@@ -1320,6 +1321,32 @@ static ssize_t tmc_etr_store_byte_cntr_value(struct device *dev, 
static DEVICE_ATTR(byte_cntr_value, S_IRUGO | S_IWUSR,

		   tmc_etr_show_byte_cntr_value, tmc_etr_store_byte_cntr_value);



static ssize_t tmc_etr_show_mem_size(struct device *dev,

				     struct device_attribute *attr,

				     char *buf)

{

	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);

	unsigned long val = drvdata->mem_size;



	return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);

}



static ssize_t tmc_etr_store_mem_size(struct device *dev,

				      struct device_attribute *attr,

				      const char *buf, size_t size)

{

	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);

	unsigned long val;



	if (sscanf(buf, "%lx", &val) != 1)

		return -EINVAL;



	drvdata->mem_size = val;

	return size;

}

static DEVICE_ATTR(mem_size, S_IRUGO | S_IWUSR,

		   tmc_etr_show_mem_size, tmc_etr_store_mem_size);



static struct attribute *tmc_attrs[] = {

	&dev_attr_trigger_cntr.attr,

	NULL,
@@ -1332,6 +1359,7 @@ static struct attribute_group tmc_attr_grp = { 
static struct attribute *tmc_etr_attrs[] = {

	&dev_attr_out_mode.attr,

	&dev_attr_byte_cntr_value.attr,

	&dev_attr_mem_size.attr,

	NULL,

};