On Wed, Mar 01, 2017 at 09:02:33AM -0700, Mathieu Poirier wrote:
> 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'.
Sure, will fix this.
> > +
> > + 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.
Will remove it.
Thanks,
Leo Yan
> > +
> > 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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