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coresight: platform: Cleanup coresight connection handling

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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.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2018-09-20 13:17:42 -06:00 committed by Greg Kroah-Hartman
parent 2058224f54
commit c2c729415b
3 changed files with 22 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/hwtracing/coresight/coresight.c
View File

@ -995,13 +995,11 @@ 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) {
@ -1030,22 +1028,7 @@ 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_free_refcnts;
}
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;
@ -1078,8 +1061,6 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
return csdev;
err_free_refcnts:
kfree(refcnts);
err_free_csdev:
kfree(csdev);
err_out:

53
drivers/hwtracing/coresight/of_coresight.c
View File

@ -75,29 +75,13 @@ 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_kcalloc(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_kcalloc(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_kcalloc(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;
}
@ -121,7 +105,7 @@ EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
/*
* of_coresight_parse_endpoint : Parse the given output endpoint @ep
* and fill the connection information in @pdata[@i].
* and fill the connection information in @conn
*
* Parses the local port, remote device name and the remote port.
*
@ -133,8 +117,7 @@ EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
*/
static int of_coresight_parse_endpoint(struct device *dev,
struct device_node *ep,
struct coresight_platform_data *pdata,
int i)
struct coresight_connection *conn)
{
int ret = 0;
struct of_endpoint endpoint, rendpoint;
@ -166,11 +149,11 @@ static int of_coresight_parse_endpoint(struct device *dev,
break;
}
pdata->outports[i] = endpoint.port;
pdata->child_names[i] = devm_kstrdup(dev,
dev_name(rdev),
GFP_KERNEL);
pdata->child_ports[i] = rendpoint.port;
conn->outport = endpoint.port;
conn->child_name = devm_kstrdup(dev,
dev_name(rdev),
GFP_KERNEL);
conn->child_port = rendpoint.port;
/* Connection record updated */
ret = 1;
} while (0);
@ -189,8 +172,9 @@ 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 device_node *ep = NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
@ -212,6 +196,7 @@ of_get_coresight_platform_data(struct device *dev,
if (ret)
return ERR_PTR(ret);
conn = pdata->conns;
/* Iterate through each port to discover topology */
while ((ep = of_graph_get_next_endpoint(node, ep))) {
/*
@ -221,10 +206,10 @@ of_get_coresight_platform_data(struct device *dev,
if (of_coresight_ep_is_input(ep))
continue;
ret = of_coresight_parse_endpoint(dev, ep, pdata, i);
ret = of_coresight_parse_endpoint(dev, ep, conn);
switch (ret) {
case 1:
i++; /* Fall through */
conn++; /* Fall through */
case 0:
break;
default:

9
include/linux/coresight.h
View File

@ -94,20 +94,15 @@ union 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;
};
/**