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Date: Fri, 8 Jun 2018 14:18:29 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Suzuki K Poulose <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org, robh@...nel.org,
frowand.list@...il.com, mark.rutland@....com, sudeep.holla@....com,
arm@...nel.org, linux-kernel@...r.kernel.org, matt.sealey@....com,
john.horley@....com, charles.garcia-tobin@....com,
coresight@...ts.linaro.org, devicetree@...r.kernel.org,
mike.leach@...aro.org
Subject: Re: [PATCH 05/20] coresight: platform: Cleanup coresight connection
handling
On Tue, Jun 05, 2018 at 10:43:16PM +0100, Suzuki K Poulose wrote:
> 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 | 51 ++++++++++++------------------
> include/linux/coresight.h | 9 ++----
> 3 files changed, 23 insertions(+), 58 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 2893cfe..69e9136 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -953,13 +953,11 @@ 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) {
> @@ -988,22 +986,7 @@ 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;
> @@ -1032,8 +1015,6 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
>
> return csdev;
>
> -err_kzalloc_conns:
> - kfree(refcnts);
> err_kzalloc_refcnts:
> kfree(csdev);
> err_kzalloc_csdev:
> diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
> index ada4f07..d01a9ce 100644
> --- a/drivers/hwtracing/coresight/of_coresight.c
> +++ b/drivers/hwtracing/coresight/of_coresight.c
> @@ -70,26 +70,13 @@ 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;
> }
> @@ -113,24 +100,24 @@ 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 *@...nn.
> *
> * Parses the local port, remote device name and the remote port. Also
> - * updates *@i to point to the next index, when an entry is added.
> + * updates *@...nn to point to the next record, when an entry is added.
> *
> * Returns :
> * 0 - If the parsing completed without any fatal errors.
> * -Errno - Fatal error, abort the scanning.
> */
> static int of_coresight_parse_endpoint(struct device_node *ep,
> - struct coresight_platform_data *pdata,
> - int *i)
> + struct coresight_connection **pconn)
> {
> int ret = 0;
> struct of_endpoint endpoint, rendpoint;
> struct device_node *rparent = NULL;
> struct device_node *rep = NULL;
> struct device *rdev = NULL;
> + struct coresight_connection *conn = *pconn;
>
> do {
> /*
> @@ -163,11 +150,11 @@ static int of_coresight_parse_endpoint(struct device_node *ep,
> break;
> }
>
> - pdata->outports[*i] = endpoint.port;
> - pdata->child_names[*i] = dev_name(rdev);
> - pdata->child_ports[*i] = rendpoint.port;
> - /* Move the index */
> - (*i)++;
> + conn->outport = endpoint.port;
> + conn->child_name = dev_name(rdev);
> + conn->child_port = rendpoint.port;
> + /* Move the connection record */
> + (*pconn)++;
> } while (0);
>
> if (rparent)
> @@ -182,8 +169,9 @@ 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);
> @@ -205,13 +193,14 @@ 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 */
> ep = of_graph_get_next_endpoint(node, ep);
> if (!ep)
> break;
> - ret = of_coresight_parse_endpoint(ep, pdata, &i);
> + ret = of_coresight_parse_endpoint(ep, &conn);
> if (ret)
> return ERR_PTR(ret);
> } while (ep);
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 69a5c9f..2a75a15 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -82,20 +82,15 @@ 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;
> };
Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
>
> /**
> --
> 2.7.4
>
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