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@quicinc.com Signed-off-by: Mao Jinlong quic_jinlmao@quicinc.com
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 ?
- There is no irq for TPDM
- 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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