On 6/1/2022 5:56 PM, Jinlong Mao wrote:
On 6/1/2022 5:30 PM, Suzuki K Poulose wrote:
On 01/06/2022 10:21, Jinlong Mao wrote:
Hi Suzuki,
On 5/24/2022 3:00 PM, Jinlong Mao wrote:
Hi Suzuki,
Thank you for the review.
On 5/23/2022 4:57 PM, Suzuki K Poulose wrote:
Hi
On 09/05/2022 14:39, Mao Jinlong wrote:
Add driver to support Coresight device TPDM (Trace, Profiling and
Diagnostics Monitor). TPDM is a monitor to collect data from
different datasets. This change is to add probe/enable/disable
functions for tpdm source.
Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
Signed-off-by: Mao Jinlong <quic_jinlmao@xxxxxxxxxxx>
---
drivers/hwtracing/coresight/Kconfig | 13 ++
drivers/hwtracing/coresight/Makefile | 1 +
drivers/hwtracing/coresight/coresight-core.c | 5 +-
drivers/hwtracing/coresight/coresight-tpdm.c | 146
+++++++++++++++++++
drivers/hwtracing/coresight/coresight-tpdm.h | 26 ++++
include/linux/coresight.h | 1 +
6 files changed, 191 insertions(+), 1 deletion(-)
create mode 100644 drivers/hwtracing/coresight/coresight-tpdm.c
create mode 100644 drivers/hwtracing/coresight/coresight-tpdm.h
+/**
+ * struct tpdm_drvdata - specifics associated to an TPDM component
+ * @base: memory mapped base address for this component.
+ * @dev: The device entity associated to this component.
+ * @csdev: component vitals needed by the framework.
+ * @lock: lock for the enable value.
+ * @enable: enable status of the component.
+ */
+
+struct tpdm_drvdata {
+ void __iomem *base;
+ struct device *dev;
+ struct coresight_device *csdev;
+ struct mutex lock;
Why mutex lock ? Couldn't this be a spinlock ?
1. There is no irq for TPDM
2. As there are 7 dataset types, there will be some FOR loop to
configure
tpdm registers which may cause some time.
How long does it take to configure ? Is it too long enough to trigger
RCU stalls ? as long as we don't do any sleeping/blocking operations
we should be fine with a spinlock.
Suzuki
Let me check on internal device and get back to you.
Thanks
Jinlong Mao
The time of configuring the registers doesn't reach RCU stall timeout value.
I will use spin_lock for both tpdm and tpda.
Thanks
Jinlong Mao
I think we can use mutex lock here. Do you have any more comments
for this ?
Thanks
Jinlong Mao
+ bool enable;
+};
+
+#endif /* _CORESIGHT_CORESIGHT_TPDM_H */
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index 247147c11231..a9efac55029d 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -61,6 +61,7 @@ enum coresight_dev_subtype_source {
CORESIGHT_DEV_SUBTYPE_SOURCE_PROC,
CORESIGHT_DEV_SUBTYPE_SOURCE_BUS,
CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE,
+ CORESIGHT_DEV_SUBTYPE_SOURCE_DATA_ONLY,
super minor nit: I find the choice of name a bit odd.
We could simply make it something like :
CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS:
Suzuki
I will check and update.
};
enum coresight_dev_subtype_helper {
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