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Message-Id: <1527858967-16047-5-git-send-email-suzuki.poulose@arm.com>
Date: Fri, 1 Jun 2018 14:16:03 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: mathieu.poirier@...aro.org, sudeep.holla@....com, robh@...nel.org,
mark.rutland@....com, frowand.list@...il.com, matt.sealey@....com,
charles.garcia-tobin@....com, john.horley@....com,
mike.leach@...aro.org, coresight@...ts.linaro.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Suzuki K Poulose <suzuki.poulose@....com>
Subject: [RFC PATCH 4/8] coresight: platform: Cleanup coresight connection handling
The platform code parses the component connections and populates
a platform-description of the output connections in arrays of fields
(which is never freed). This is later copied in the coresight_register
to a newly allocated area, represented by coresight_connection(s).
This patch cleans up the code dealing with connections by making
use of the "coresight_connection" structure right at the platform
code and lets the generic driver simply re-use information provided
by the platform.
Thus making it reader friendly as well as avoiding the wastage of
unused memory.
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
drivers/hwtracing/coresight/coresight.c | 21 +---------------
drivers/hwtracing/coresight/of_coresight.c | 40 +++++++++++-------------------
include/linux/coresight.h | 9 ++-----
3 files changed, 17 insertions(+), 53 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 389c4ba..3b3756e 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -961,13 +961,11 @@ postcore_initcall(coresight_init);
struct coresight_device *coresight_register(struct coresight_desc *desc)
{
- int i;
int ret;
int link_subtype;
int nr_refcnts = 1;
atomic_t *refcnts = NULL;
struct coresight_device *csdev;
- struct coresight_connection *conns = NULL;
csdev = kzalloc(sizeof(*csdev), GFP_KERNEL);
if (!csdev) {
@@ -996,22 +994,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
csdev->nr_inport = desc->pdata->nr_inport;
csdev->nr_outport = desc->pdata->nr_outport;
- /* Initialise connections if there is at least one outport */
- if (csdev->nr_outport) {
- conns = kcalloc(csdev->nr_outport, sizeof(*conns), GFP_KERNEL);
- if (!conns) {
- ret = -ENOMEM;
- goto err_kzalloc_conns;
- }
-
- for (i = 0; i < csdev->nr_outport; i++) {
- conns[i].outport = desc->pdata->outports[i];
- conns[i].child_name = desc->pdata->child_names[i];
- conns[i].child_port = desc->pdata->child_ports[i];
- }
- }
-
- csdev->conns = conns;
+ csdev->conns = desc->pdata->conns;
csdev->type = desc->type;
csdev->subtype = desc->subtype;
@@ -1039,8 +1022,6 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
return csdev;
err_device_register:
- kfree(conns);
-err_kzalloc_conns:
kfree(refcnts);
err_kzalloc_refcnts:
kfree(csdev);
diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index e0deab0..a3f3416 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c
@@ -77,26 +77,13 @@ static void of_coresight_get_ports(const struct device_node *node,
static int of_coresight_alloc_memory(struct device *dev,
struct coresight_platform_data *pdata)
{
- /* List of output port on this component */
- pdata->outports = devm_kzalloc(dev, pdata->nr_outport *
- sizeof(*pdata->outports),
- GFP_KERNEL);
- if (!pdata->outports)
- return -ENOMEM;
-
- /* Children connected to this component via @outports */
- pdata->child_names = devm_kzalloc(dev, pdata->nr_outport *
- sizeof(*pdata->child_names),
- GFP_KERNEL);
- if (!pdata->child_names)
- return -ENOMEM;
-
- /* Port number on the child this component is connected to */
- pdata->child_ports = devm_kzalloc(dev, pdata->nr_outport *
- sizeof(*pdata->child_ports),
- GFP_KERNEL);
- if (!pdata->child_ports)
- return -ENOMEM;
+ if (pdata->nr_outport) {
+ pdata->conns = devm_kzalloc(dev, pdata->nr_outport *
+ sizeof(*pdata->conns),
+ GFP_KERNEL);
+ if (!pdata->conns)
+ return -ENOMEM;
+ }
return 0;
}
@@ -122,8 +109,9 @@ struct coresight_platform_data *
of_get_coresight_platform_data(struct device *dev,
const struct device_node *node)
{
- int i = 0, ret = 0;
+ int ret = 0;
struct coresight_platform_data *pdata;
+ struct coresight_connection *conn;
struct of_endpoint endpoint, rendpoint;
struct device *rdev;
struct device_node *ep = NULL;
@@ -145,6 +133,7 @@ of_get_coresight_platform_data(struct device *dev,
if (ret)
return ERR_PTR(ret);
+ conn = pdata->conns;
/* Iterate through each port to discover topology */
do {
/* Get a handle on a port */
@@ -166,7 +155,7 @@ of_get_coresight_platform_data(struct device *dev,
continue;
/* The local out port number */
- pdata->outports[i] = endpoint.port;
+ conn->outport = endpoint.port;
/*
* Get a handle on the remote endpoint and the device
@@ -186,10 +175,9 @@ of_get_coresight_platform_data(struct device *dev,
if (!rdev)
return ERR_PTR(-EPROBE_DEFER);
- pdata->child_names[i] = dev_name(rdev);
- pdata->child_ports[i] = rendpoint.port;
-
- i++;
+ conn->child_name = dev_name(rdev);
+ conn->child_port = rendpoint.port;
+ conn++;
} while (ep);
}
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 32aaa1c..c2363bb 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -89,20 +89,15 @@ struct coresight_dev_subtype {
* @cpu: the CPU a source belongs to. Only applicable for ETM/PTMs.
* @name: name of the component as shown under sysfs.
* @nr_inport: number of input ports for this component.
- * @outports: list of remote endpoint port number.
- * @child_names:name of all child components connected to this device.
- * @child_ports:child component port number the current component is
- connected to.
* @nr_outport: number of output ports for this component.
+ * @conns: Array of nr_outport connections from this component
*/
struct coresight_platform_data {
int cpu;
const char *name;
int nr_inport;
- int *outports;
- const char **child_names;
- int *child_ports;
int nr_outport;
+ struct coresight_connection *conns;
};
/**
--
2.7.4
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