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 debugfs, through which users can check whether the debug capability is supported by a specific host controller. 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. Lu Baolu (12): usb: xhci: expose xhci extended capabilities via debugfs 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 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/xhci-dbg.c | 212 ++++++ drivers/usb/host/xhci-ext-caps.h | 9 +- drivers/usb/host/xhci.c | 27 +- drivers/usb/host/xhci.h | 10 + drivers/usb/serial/usb_debug.c | 29 +- include/linux/usb/xhci-dbc.h | 224 ++++++ 14 files changed, 2269 insertions(+), 5 deletions(-) create mode 100644 Documentation/usb/xhci-dbc.txt create mode 100644 drivers/usb/early/xhci-dbc.c create mode 100644 include/linux/usb/xhci-dbc.h -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
