[PATCH v5 00/13] Add support to configure TPDM DSB subunit
Tao Zhang
quic_taozha at quicinc.com
Mon Jun 12 00:07:33 PDT 2023
Introduction of TPDM DSB subunit
DSB subunit is responsible for creating a dataset element, and is also
optionally responsible for packing it to fit multiple elements on a
single ATB transfer if possible in the configuration. The TPDM Core
Datapath requests timestamps be stored by the TPDA and then delivering
ATB sized data (depending on ATB width and element size, this could
be smaller or larger than a dataset element) to the ATB Mast FSM.
The DSB subunit must be configured prior to enablement. This series
adds support for TPDM to configure the configure DSB subunit.
Once this series patches are applied properly, the new tpdm nodes for
should be observed at the tpdm path /sys/bus/coresight/devices/tpdm*
which supports DSB subunit.
e.g.
/sys/devices/platform/soc at 0/69d0000.tpdm/tpdm0#ls -l | grep dsb
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_edge_ctrl
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_edge_ctrl_mask
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_mode
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_patt_mask
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_patt_ts
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_patt_type
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_patt_val
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_trig_patt_mask
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_trig_patt_val
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_trig_ts
-rw-r--r-- 1 root root 4096 Jan 1 00:01 dsb_trig_type
We can use the commands are similar to the below to configure the
TPDMs which support DSB subunit. Enable coresight sink first.
echo 1 > /sys/bus/coresight/devices/tmc_etf0/enable_sink
echo 1 > /sys/bus/coresight/devices/tpdm0/reset
echo 0x3 0x3 0x1 > /sys/bus/coresight/devices/tpdm0/dsb_edge_ctrl_mask
echo 0x6d 0x6d 0 > /sys/bus/coresight/devices/tpdm0/dsb_edge_ctrl
echo 1 > /sys/bus/coresight/devices/tpdm0/dsb_patt_ts
echo 1 > /sys/bus/coresight/devices/tpdm0/dsb_patt_type
echo 0 > /sys/bus/coresight/devices/tpdm0/dsb_trig_ts
echo 0 0xFFFFFFFF > /sys/bus/coresight/devices/tpdm0/dsb_patt_mask
echo 0 0xFFFFFFFF > /sys/bus/coresight/devices/tpdm0/dsb_trig_patt_val
This patch series depends on patch series "[PATCH v6 0/9] coresight:
Fix CTI module refcount leak by making it a helper device"
https://patchwork.kernel.org/project/linux-arm-kernel/patch/20230425143542.2305069-14-james.clark@arm.com/
TPDM_DSB commit tree:
https://git.codelinaro.org/clo/linux-kernel/coresight/-/tree/tpdm-dsb-v5
https://git.codelinaro.org/clo/linux-kernel/coresight/-/commits/tpdm-dsb-v5
Changes in V5:
1. Correct data type for DSB element size in dt-bindings patch.
2. Refine the recursive function "tpda_set_element_size".
-- Suzuki K Poulose
3. Get return value of the function "__tpda_enable" in
"tpda_enable".
-- Suzuki K Poulose
4. Refine the comments on "dsb_esize".
-- Suzuki K Poulose
5. Split the chage that introduce the subtype
"SUBTYPE_SOURCE_TPDM" to Coresight driver.
-- Suzuki K Poulose
6. Inline the trigger type setting to "tpdm_enable_dsb" simply.
-- Suzuki K Poulose
7. Split the change that remove the needless CS_{UN,}LOCK in
the function "tpdm_datasets_setup".
-- Suzuki K Poulose
8. Remove the disablement step in the reset node.
-- Suzuki K Poulose
9. Update the kernel version to 6.5 in the sysfs document.
-- Suzuki K Poulose
10. Remove the needless check in "tpdm_dsb_is_visible".
-- Suzuki K Poulose
11. Change the macro to mask the mode of DSB TPDM.
-- Suzuki K Poulose
12. Add a check to make sure "sysfs_emit_at" calling will not
cause overflow.
-- Suzuki K Poulose
13. Change the macro to get "edge_ctrl" value.
-- Suzuki K Poulose
14. Remove the needless comments in the sysfs document.
-- Suzuki K Poulose
15. Replace "TPDM_DSB_MAX_PATT" with "drvdata->dsb->msr_num" in
"dsb_msr_show".
-- Suzuki K Poulose
16. Update the check of MSR number in "dsb_msr_store".
-- Suzuki K Poulose
17. Write data to the MSR registers in the DSB TPDM enablement
function.
-- Suzuki K Poulose
Changes in V4:
1. Change the range of the property "qcom,dsb-element-size", and
change the type to enumeration.
-- Suzuki K Poulose, Krzysztof Kozlowski
2. Change dsb_esize from 32 bits to 8 bits.
-- Suzuki K Poulose
3. Update the function tpda_set_element_size since James has
updated the dependency series. Meanwhile, it will send out a
warning if it detects more than one TPDM from the same TPDA
input port.
-- Suzuki K Poulose
4. Add a source_sub_type for TPDM to distinguish TPDM from
the other coresight source.
-- Suzuki K Poulose
5. Return error if the element size is not configured on
devicetree in TPDA enablement.
-- Suzuki K Poulose
6. Move memory allocation from "tpdm_init_datasets" to
"tpdm_datasets_setup". Rename "tpdm_init_datasets" as
"tpdm_reset_datasets".
-- Suzuki K Poulose
7. Replace "coresight_disable" with "coresight_disable_source"
to disable the TPDM in resetting.
-- Suzuki K Poulose
8. Make sure "drvdata" is not NULL pointer before using it.
-- Suzuki K Poulose
9. Change "set_dsb_cycacc_mode" to "set_dsb_test_mode" since
cycle accurate mode is not supported on the current targets.
It is replaced by test mode.
10. Document the value of "dsb_mode".
-- Suzuki K Poulose
11. Macros are used to replace the formulas on dsb edge control
nodes.
-- Suzuki K Poulose
12. Document the values of "dsb_trig_patt_val" and
"dsb_trig_patt_mask".
-- Suzuki K Poulose
13. Combine two pattern related loops to one. And move DSB TIER
register configurations to the new function "set_dsb_tier".
-- Suzuki K Poulose
14. Rename the property "qcom,dsb_msr_num" to "qcom,dsb-msrs-num".
-- Suzuki K Poulose, Krzysztof Kozlowski
Changes in V3:
1. Move the property "qcom,dsb-element-size" to TPDM
devicetree and update the TPDM yaml file for this item.
-- Suzuki K Poulose
2. Add the error message when the DSB element size is not set to
32-bit or 64-bit. -- Suzuki K Poulose
3. Add more information to the comments of patch #3
-- Suzuki K Poulose
4. Combine the value updates to the TPDM_DSB_CR for TPDM.
-- Suzuki K Poulose
5. Remove the function "tpdm_datasets_alloc", and fold its code
to a new function "tpdm_init_datasets". It will complete the
initialization of TPDM. -- Suzuki K Poulose
6. Change the method of qualifying input values.
-- Suzuki K Poulose
7. Add the documentation of the new sysfs handles.
-- Suzuki K Poulose
8. Provide the separate handles for the "mode bits".
-- Suzuki K Poulose
Changes in V2:
1. Change the name of the property "qcom,dsb-elem-size" to
"qcom,dsb-element-size" -- Suzuki K Poulose
2. Update the TPDA yaml file for the item "qcom,dsb-elem-size".
-- Krzysztof Kozlowski
3. Add the full name of DSB in the description of the item
"qcom,dsb-elem-size". -- Rob Herring
Changes in V1:
1. Change the definition of the property "qcom,dsb-elem-size" from
"uint32-array" to "uint32-matrix". -- Krzysztof Kozlowski
2. Add the full name of DSB. -- Rob Herring
3. Deal with 2 entries in an iteration in TPDA driver. -- Suzuki K Poulose
4. Divide the function "tpdm_datasets_alloc" into two functions,
"tpdm_datasets_setup" and "tpdm_datasets_alloc".
5. Detecte the input string with the conventional semantics automatically,
and constrain the size of the input value. -- Suzuki K Poulose
6. Use the hook function "is_visible()" to hide the DSB related knobs if
the data sets are missing. -- Suzuki K Poulose
7. Use the macros "FIELD_GET" and "FIELD_PREP" to set the values.
-- Suzuki K Poulose
8. Update the definition of the macros in TPDM driver.
9. Update the comments of the values for the nodes which are for DSB
element creation and onfigure pattern match output. -- Suzuki K Poulose
10. Use API "sysfs_emit" to "replace scnprintf". -- Suzuki K Poulose
Tao Zhang (13):
coresight-tpdm: Remove the unnecessary lock
dt-bindings: arm: Add support for DSB element size
coresight-tpdm: Introduce TPDM subtype to TPDM driver
coresight-tpda: Add DSB dataset support
coresight-tpdm: Initialize DSB subunit configuration
coresight-tpdm: Add reset node to TPDM node
coresight-tpdm: Add nodes to set trigger timestamp and type
coresight-tpdm: Add node to set dsb programming mode
Add nodes for dsb edge control
coresight-tpdm: Add nodes to configure pattern match output
coresight-tpdm: Add nodes for timestamp request
dt-bindings: arm: Add support for DSB MSR register
coresight-tpdm: Add nodes for dsb msr support
.../ABI/testing/sysfs-bus-coresight-devices-tpdm | 169 +++++
.../bindings/arm/qcom,coresight-tpdm.yaml | 20 +
drivers/hwtracing/coresight/coresight-core.c | 1 +
drivers/hwtracing/coresight/coresight-tpda.c | 96 ++-
drivers/hwtracing/coresight/coresight-tpda.h | 4 +
drivers/hwtracing/coresight/coresight-tpdm.c | 721 ++++++++++++++++++++-
drivers/hwtracing/coresight/coresight-tpdm.h | 83 +++
include/linux/coresight.h | 1 +
8 files changed, 1077 insertions(+), 18 deletions(-)
--
2.7.4
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