[PATCH v9 6/9] coresight: refactor with function of_coresight_get_cpu
From: Leo Yan <hidden>
Date: 2017-05-09 02:51:26
Also in:
linux-arm-msm, linux-devicetree, lkml
Subsystem:
arm/coresight framework and drivers, hardware tracing facilities, the rest · Maintainers:
Suzuki K Poulose, Alexander Shishkin, Linus Torvalds
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@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Leo Yan <redacted> --- drivers/hwtracing/coresight/of_coresight.c | 43 +++++++++++++++++++----------- include/linux/coresight.h | 3 +++ 2 files changed, 31 insertions(+), 15 deletions(-)
diff --git a/drivers/hwtracing/coresight/of_coresight.c b/drivers/hwtracing/coresight/of_coresight.c
index 225b2dd..a187941 100644
--- a/drivers/hwtracing/coresight/of_coresight.c
+++ b/drivers/hwtracing/coresight/of_coresight.c@@ -101,16 +101,40 @@ static int of_coresight_alloc_memory(struct device *dev, return 0; } +int of_coresight_get_cpu(const struct device_node *node) +{ + int cpu; + bool found; + struct device_node *dn, *np; + + dn = of_parse_phandle(node, "cpu", 0); + + /* Affinity defaults to CPU0 */ + if (!dn) + return 0; + + for_each_possible_cpu(cpu) { + np = of_cpu_device_node_get(cpu); + found = (dn == np); + of_node_put(np); + if (found) + break; + } + of_node_put(dn); + + /* Affinity to CPU0 if no cpu nodes are found */ + return found ? cpu : 0; +} +EXPORT_SYMBOL_GPL(of_coresight_get_cpu); + struct coresight_platform_data * of_get_coresight_platform_data(struct device *dev, const 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; - bool found; - struct device_node *dn, *np; struct device_node *ep = NULL; struct device_node *rparent = NULL; struct device_node *rport = NULL;
@@ -177,18 +201,7 @@ of_get_coresight_platform_data(struct device *dev, } while (ep); } - dn = of_parse_phandle(node, "cpu", 0); - for_each_possible_cpu(cpu) { - np = of_cpu_device_node_get(cpu); - found = (dn == np); - of_node_put(np); - if (found) - break; - } - of_node_put(dn); - - /* Affinity to CPU0 if no cpu nodes are found */ - pdata->cpu = found ? cpu : 0; + pdata->cpu = of_coresight_get_cpu(node); return pdata; }
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index bf0aa50..d950dad 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h@@ -263,10 +263,13 @@ static inline int coresight_timeout(void __iomem *addr, u32 offset, #endif #ifdef CONFIG_OF +extern int of_coresight_get_cpu(const struct device_node *node); extern struct coresight_platform_data * of_get_coresight_platform_data(struct device *dev, const struct device_node *node); #else +static inline int of_coresight_get_cpu(const struct device_node *node) +{ return 0; } static inline struct coresight_platform_data *of_get_coresight_platform_data( struct device *dev, const struct device_node *node) { return NULL; } #endif
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2.7.4