linux-kernel - [PATCH v5 0/3] dmaengine: fsl_edma: add trace and debugfs support

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Date:   Mon,  2 Oct 2023 14:37:47 -0400
From:   Frank Li <Frank.Li@....com>
To:     arnd@...db.de, vkoul@...nel.org
Cc:     Frank.Li@....com, bhe@...hat.com, dmaengine@...r.kernel.org,
        gregkh@...uxfoundation.org, imx@...ts.linux.dev,
        linux-kernel@...r.kernel.org, lkp@...el.com,
        oe-kbuild-all@...ts.linux.dev, rafael@...nel.org
Subject: [PATCH v5 0/3] dmaengine: fsl_edma: add trace and debugfs support

Change from v3 to v5
- There are still some discussion about 64bit register access.
  Drop 64 register support and use sperate patch to enable 64bit register
support in future.

Change from v3 to v4
- Fix build warning

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309210500.owiirl4c-lkp@intel.com/

Change from v2 to v3
- Fixed sparse build warning
- improve debugfs_create_regset32 and use debugfs_create_regset() to dump
  all registers

Change from v1 to v2
- Fixed tcd trace issue, data need be saved firstly.

=== Trace ===

echo 1 >/sys/kernel/debug/tracing/tracing_on
echo 1 >/sys/kernel/debug/tracing/events/fsl_edma/enable

Run any dma test
...

cat /sys/kernel/debug/tracing/trace

 uart_testapp_11-448     [000] d..1.    69.185019: edma_fill_tcd:
==== TCD =====
  saddr:  0x831ee020
  soff:       0x8000
  attr:       0xffff
  nbytes: 0xfba40000
  slast:  0x00000000
  daddr:  0x8aaa4800
  doff:       0x0001
  citer:      0x0800
  dlast:  0xfba40020
  csr:        0x0052
  biter:      0x0800

 uart_testapp_11-448     [000] d..2.    69.185022: edma_writew: offset 0001803c: value 00000000
 uart_testapp_11-448     [000] d..2.    69.185023: edma_writel: offset 00018020: value 4259001c
 uart_testapp_11-448     [000] d..2.    69.185024: edma_writel: offset 00018030: value 8aaa4000

=== DebugFS ===

cat /sys/kernel/debug/dmaengine/42000000.dma-controller/42000000.dma-controller-CH00/ch_sbr
0x00208003

Frank Li (3):
  debugfs_create_regset32() support 8/16 bit width registers
  dmaengine: fsl-emda: add debugfs support
  dmaengine: fsl-edma: add trace event support

 drivers/dma/Makefile           |   7 +-
 drivers/dma/fsl-edma-common.c  |   2 +
 drivers/dma/fsl-edma-common.h  |  37 +++++-
 drivers/dma/fsl-edma-debugfs.c | 200 +++++++++++++++++++++++++++++++++
 drivers/dma/fsl-edma-main.c    |   2 +
 drivers/dma/fsl-edma-trace.c   |   4 +
 drivers/dma/fsl-edma-trace.h   | 134 ++++++++++++++++++++++
 fs/debugfs/file.c              |  53 ++++++---
 include/linux/debugfs.h        |  17 ++-
 9 files changed, 428 insertions(+), 28 deletions(-)
 create mode 100644 drivers/dma/fsl-edma-debugfs.c
 create mode 100644 drivers/dma/fsl-edma-trace.c
 create mode 100644 drivers/dma/fsl-edma-trace.h

-- 
2.34.1