[PATCH 0/3] drivers: support for sysfs initiated coredump

[Arend van Spriel <arend.vanspriel@broadcom.com>]

This series is intended for 4.17 adding support for sysfs initiated
coredump. This uses new functionality that was added in drivers base.
Device drivers can now implement a .coredump() callback upon which a
sysfs entry is created when the device is bound to the driver. From
user-space a device coredump can be initiated. The easiest way is by
going the drivers entry and enter into the bound device folder like
this:

  # cd /sys/bus/pci/drivers/brcmfmac/0000:02:00.0
  # echo 1 > coredump
  # ls /sys/class/devcoredump/
  devcd1	disabled
  # ls -l /sys/class/devcoredump/devcd1/
  total 0
  -rw------- 1 root root    0 Feb 19 23:49 data
  lrwxrwxrwx 1 root root    0 Feb 19 23:49 failing_device ->
  	../../../pci0000:00/0000:00:1c.0/0000:02:00.0
  drwxr-xr-x 2 root root    0 Feb 19 23:49 power
  lrwxrwxrwx 1 root root    0 Feb 19 23:49 subsystem ->
  	../../../../class/devcoredump
  -rw-r--r-- 1 root root 4096 Feb 19 23:49 uevent

The device driver can implement the .coredump() callback as they like.
The use of the dev_coredump api is not enforced although the sysfs entry
is only created when CONFIG_DEV_COREDUMP is selected.

Apart from brcmfmac, the other drivers used dev_coredump api and had a
mechanism in place through debugfs, which is removed in these patches.
With these patches initiating the coredump can be done without selecting
CONFIG_DEBUGFS. No attempt was made to look for drivers providing some sore
of coredump functionality by other means than the dev_coredump api.

The first 2 patches apply to the master branch of the wireless-drivers-next
repository. The last patch applies to the master branch of the bluetooth-next.

Arend van Spriel (3):
  brcmfmac: add support for sysfs initiated coredump
  mwifiex: support sysfs initiated device coredump
  btmrvl: support sysfs initiated firmware coredump

 drivers/bluetooth/btmrvl_debugfs.c                 | 31 ----------------------
 drivers/bluetooth/btmrvl_drv.h                     |  2 --
 drivers/bluetooth/btmrvl_main.c                    |  6 -----
 drivers/bluetooth/btmrvl_sdio.c                    | 18 ++++++++-----
 .../wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c  |  1 +
 .../net/wireless/broadcom/brcm80211/brcmfmac/bus.h |  2 ++
 .../wireless/broadcom/brcm80211/brcmfmac/core.c    |  7 +++++
 .../wireless/broadcom/brcm80211/brcmfmac/pcie.c    |  1 +
 drivers/net/wireless/marvell/mwifiex/debugfs.c     | 31 +---------------------
 drivers/net/wireless/marvell/mwifiex/pcie.c        | 19 +++++++++++--
 drivers/net/wireless/marvell/mwifiex/sdio.c        | 13 +++++++++
 drivers/net/wireless/marvell/mwifiex/usb.c         | 14 ++++++++++
 12 files changed, 68 insertions(+), 77 deletions(-)

-- 
1.9.1