On Tue, Feb 28, 2017 at 11:06:59PM +0800, Leo Yan wrote:
> This is refactor to add function of_coresight_get_cpu(), so it's used to
> retrieve CPU id for coresight component. Finally can use it as a common
> function for multiple places.
>
> Suggested-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> Signed-off-by: Leo Yan <leo.yan@xxxxxxxxxx>
> ---
> drivers/hwtracing/coresight/of_coresight.c | 35 ++++++++++++++++++++----------
> include/linux/coresight.h | 2 ++
> 2 files changed, 25 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
> index 629e031..2e7bbe2 100644
> --- a/drivers/hwtracing/coresight/of_coresight.c
> +++ b/drivers/hwtracing/coresight/of_coresight.c
> @@ -101,14 +101,34 @@ static int of_coresight_alloc_memory(struct device *dev,
> return 0;
> }
>
> +int of_coresight_get_cpu(struct device_node *node)
> +{
> + int cpu;
> + struct device_node *dn;
> +
> + dn = of_parse_phandle(node, "cpu", 0);
> +
> + /* Affinity defaults to CPU0 */
> + if (!dn)
> + return 0;
> +
> + for_each_possible_cpu(cpu) {
> + if (dn == of_get_cpu_node(cpu, NULL))
> + break;
> + }
> + of_node_put(dn);
In the case where no CPU nodes are found this function will return the number
of the last CPU that was probed instead of '0'.
> +
> + return cpu;
> +}
> +EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
Any reason you exported this - the fact that is it declared in corsight.h should
be enough.
Thanks,
Mathieu
> +
> struct coresight_platform_data *of_get_coresight_platform_data(
> struct device *dev, struct device_node *node)
> {
> - int i = 0, ret = 0, cpu;
> + int i = 0, ret = 0;
> struct coresight_platform_data *pdata;
> struct of_endpoint endpoint, rendpoint;
> struct device *rdev;
> - struct device_node *dn;
> struct device_node *ep = NULL;
> struct device_node *rparent = NULL;
> struct device_node *rport = NULL;
> @@ -175,16 +195,7 @@ struct coresight_platform_data *of_get_coresight_platform_data(
> } while (ep);
> }
>
> - /* Affinity defaults to CPU0 */
> - pdata->cpu = 0;
> - dn = of_parse_phandle(node, "cpu", 0);
> - for (cpu = 0; dn && cpu < nr_cpu_ids; cpu++) {
> - if (dn == of_get_cpu_node(cpu, NULL)) {
> - pdata->cpu = cpu;
> - break;
> - }
> - }
> - of_node_put(dn);
> + pdata->cpu = of_coresight_get_cpu(node);
>
> return pdata;
> }
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 2a5982c..6709561 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -263,11 +263,13 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset,
> #endif
>
> #ifdef CONFIG_OF
> +extern int of_coresight_get_cpu(struct device_node *node);
> extern struct coresight_platform_data *of_get_coresight_platform_data(
> struct device *dev, struct device_node *node);
> #else
> static inline struct coresight_platform_data *of_get_coresight_platform_data(
> struct device *dev, struct device_node *node) { return NULL; }
> +static int of_coresight_get_cpu(struct device_node *node) { return 0; }
> #endif
>
> #ifdef CONFIG_PID_NS
> --
> 2.7.4
>
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