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[PATCH v4 00/12] usb: early: add support for early printk through USB3 debug port

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Hi,

This patch series adds support for early printk through USB3 debug port.
USB3 debug port is described in xHCI specification as an optional extended
capability.

The first patch adds a file in sysfs, through which users can check
whether the debug capability is supported by a specific host controller,
and the hardware state.

Patch 2 to 10 add the driver for xHCI debug capability. It interfaces with
the register set and provides the required ops (read/write/control) to upper
layers. Early printk is one consumer of these ops. The hooks for early printk
are introduced in patch 9. This design is similar to what we have done in
drivers/usb/early/ehci-dbgp.c.

Patch 11 is a minor change to usb_debug module. This change is required to
bind usb_debug with the USB3 debug device.

Patch 12 is the design document and user guide.

Change log:
v1->v2:
(1) Patch 1 re-implemented. "debugfs" has been replaced with sysfs.
    The scope reduced from all extended capabilities to debug port
    specific.
(2) Patch 11 changed. Removed unnecessary .bulk_out_size setting.

v2->v3:
(1) Patch 11 got acked by Johan Hovold.

v3->v4:
(1) Patch 1 code refactored by using xhci_find_ext_cap_by_id() helper.
(2) Patch 3 "bus hung state" changed to "port hung state" in commit message.
(3) Patch 12 added verified platform information.

Lu Baolu (12):
  usb: xhci: add sysfs file for xHCI debug port
  x86: fixmap: add permanent fixmap for xhci debug port
  usb: xhci: dbc: probe and setup xhci debug capability
  usb: xhci: dbc: add support for Intel xHCI dbc quirk
  usb: xhci: dbc: add debug buffer
  usb: xhci: dbc: add bulk out and bulk in interfaces
  usb: xhci: dbc: handle dbc-configured exit
  usb: xhci: dbc: handle endpoint stall
  x86: early_printk: add USB3 debug port earlyprintk support
  usb: xhci: dbc: add handshake between debug target and host
  usb: serial: usb_debug: add support for dbc debug device
  usb: doc: add document for xHCI DbC driver

 .../ABI/testing/sysfs-bus-pci-drivers-xhci_hcd     |   23 +
 Documentation/kernel-parameters.txt                |    1 +
 Documentation/usb/xhci-dbc.txt                     |  325 +++++
 MAINTAINERS                                        |    8 +
 arch/x86/Kconfig.debug                             |   12 +
 arch/x86/include/asm/fixmap.h                      |    4 +
 arch/x86/kernel/early_printk.c                     |    5 +
 drivers/usb/early/Makefile                         |    1 +
 drivers/usb/early/xhci-dbc.c                       | 1407 ++++++++++++++++++++
 drivers/usb/host/Makefile                          |    2 +-
 drivers/usb/host/xhci-ext-caps.h                   |   14 +-
 drivers/usb/host/xhci-sysfs.c                      |   80 ++
 drivers/usb/host/xhci.c                            |    4 +
 drivers/usb/host/xhci.h                            |    4 +
 drivers/usb/serial/usb_debug.c                     |   28 +-
 include/linux/usb/xhci-dbc.h                       |  224 ++++
 16 files changed, 2137 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-pci-drivers-xhci_hcd
 create mode 100644 Documentation/usb/xhci-dbc.txt
 create mode 100644 drivers/usb/early/xhci-dbc.c
 create mode 100644 drivers/usb/host/xhci-sysfs.c
 create mode 100644 include/linux/usb/xhci-dbc.h

Thanks,
-Baolu
-- 
2.1.4

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[PATCH v4 00/12] usb: early: add support for early printk through USB3 debug port Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:40 +0100
  [PATCH v4 05/12] usb: xhci: dbc: add debug buffer Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:40 +0100
  [PATCH v4 09/12] x86: early_printk: add USB3 debug port earlyprintk support Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 04/12] usb: xhci: dbc: add support for Intel xHCI dbc quirk Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 12/12] usb: doc: add document for xHCI DbC driver Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 03/12] usb: xhci: dbc: probe and setup xhci debug capability Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 02/12] x86: fixmap: add permanent fixmap for xhci debug port Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 10/12] usb: xhci: dbc: add handshake between debug target and host Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 01/12] usb: xhci: add sysfs file for xHCI debug port Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
    Re: [PATCH v4 01/12] usb: xhci: add sysfs file for xHCI debug port Mathias Nyman <mathias.nyman@linux.intel.com> - 2015-11-20 15:30 +0100
      Re: [PATCH v4 01/12] usb: xhci: add sysfs file for xHCI debug port Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-22 04:10 +0100
  [PATCH v4 11/12] usb: serial: usb_debug: add support for dbc debug device Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 06/12] usb: xhci: dbc: add bulk out and bulk in interfaces Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 07/12] usb: xhci: dbc: handle dbc-configured exit Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100
  [PATCH v4 08/12] usb: xhci: dbc: handle endpoint stall Lu Baolu <baolu.lu@linux.intel.com> - 2015-11-17 07:50 +0100

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