msm: qdss: sysfs interface for the qdss driver
Make the qdss driver configurable via sysfs. Remove the previous
device node based interface that provided limited ETM configuration
options.
This makes ETM, Funnel and ETB highly configurable and extensible
for future configuration options.
Change-Id: Ib95b522dde443adde83483ee58a4dbb07ab0e311
Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
diff --git a/arch/arm/mach-msm/qdss-etb.c b/arch/arm/mach-msm/qdss-etb.c
index 9ee9265..c58c93e 100644
--- a/arch/arm/mach-msm/qdss-etb.c
+++ b/arch/arm/mach-msm/qdss-etb.c
@@ -72,6 +72,8 @@
struct mutex mutex;
atomic_t in_use;
struct device *dev;
+ struct kobject *kobj;
+ uint32_t trigger_cntr;
};
static struct etb_ctx etb;
@@ -89,6 +91,7 @@
etb_writel(etb, 0x0, ETB_RAM_WRITE_POINTER);
etb_writel(etb, 0x0, ETB_RAM_READ_POINTER);
+ etb_writel(etb, etb.trigger_cntr, ETB_TRG);
etb_writel(etb, BIT(13) | BIT(0), ETB_FFCR);
etb_writel(etb, BIT(0), ETB_CTL_REG);
@@ -255,6 +258,62 @@
.fops = &etb_fops,
};
+#define ETB_ATTR(__name) \
+static struct kobj_attribute __name##_attr = \
+ __ATTR(__name, S_IRUGO | S_IWUSR, __name##_show, __name##_store)
+
+static ssize_t trigger_cntr_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t n)
+{
+ unsigned long val;
+
+ if (sscanf(buf, "%lx", &val) != 1)
+ return -EINVAL;
+
+ etb.trigger_cntr = val;
+ return n;
+}
+static ssize_t trigger_cntr_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ unsigned long val = etb.trigger_cntr;
+ return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+}
+ETB_ATTR(trigger_cntr);
+
+static int __init etb_sysfs_init(void)
+{
+ int ret;
+
+ etb.kobj = kobject_create_and_add("etb", qdss_get_modulekobj());
+ if (!etb.kobj) {
+ dev_err(etb.dev, "failed to create ETB sysfs kobject\n");
+ ret = -ENOMEM;
+ goto err_create;
+ }
+
+ ret = sysfs_create_file(etb.kobj, &trigger_cntr_attr.attr);
+ if (ret) {
+ dev_err(etb.dev, "failed to create ETB sysfs trigger_cntr"
+ " attribute\n");
+ goto err_file;
+ }
+
+ return 0;
+err_file:
+ kobject_put(etb.kobj);
+err_create:
+ return ret;
+}
+
+static void etb_sysfs_exit(void)
+{
+ sysfs_remove_file(etb.kobj, &trigger_cntr_attr.attr);
+ kobject_put(etb.kobj);
+}
+
static int __devinit etb_probe(struct platform_device *pdev)
{
int ret;
@@ -286,6 +345,8 @@
goto err_alloc;
}
+ etb_sysfs_init();
+
dev_info(etb.dev, "ETB initialized\n");
return 0;
@@ -304,6 +365,7 @@
{
if (etb.enabled)
etb_disable();
+ etb_sysfs_exit();
kfree(etb.buf);
misc_deregister(&etb_misc);
mutex_destroy(&etb.mutex);