diff options
Diffstat (limited to 'drivers/tty/hvc/Kconfig')
| -rw-r--r-- | drivers/tty/hvc/Kconfig | 82 |
1 files changed, 47 insertions, 35 deletions
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig index 8902f9b4df71..c2a4e88b328f 100644 --- a/drivers/tty/hvc/Kconfig +++ b/drivers/tty/hvc/Kconfig @@ -1,10 +1,10 @@ -if TTY +# SPDX-License-Identifier: GPL-2.0 config HVC_DRIVER bool help Generic "hypervisor virtual console" infrastructure for various - hypervisors (pSeries, iSeries, Xen, lguest). + hypervisors (pSeries, iSeries, Xen). It will automatically be selected if one of the back-end console drivers is selected. @@ -24,7 +24,6 @@ config HVC_CONSOLE config HVC_OLD_HVSI bool "Old driver for pSeries serial port (/dev/hvsi*)" depends on HVC_CONSOLE - default n config HVC_OPAL bool "OPAL Console support" @@ -42,16 +41,9 @@ config HVC_RTAS help IBM Console device driver which makes use of RTAS -config HVC_BEAT - bool "Toshiba's Beat Hypervisor Console support" - depends on PPC_CELLEB - select HVC_DRIVER - help - Toshiba's Cell Reference Set Beat Console device driver - config HVC_IUCV bool "z/VM IUCV Hypervisor console support (VM only)" - depends on S390 + depends on S390 && NET select HVC_DRIVER select IUCV default y @@ -77,32 +69,54 @@ config HVC_XEN_FRONTEND Xen driver for secondary virtual consoles config HVC_UDBG - bool "udbg based fake hypervisor console" - depends on PPC - select HVC_DRIVER - default n - help - This is meant to be used during HW bring up or debugging when - no other console mechanism exist but udbg, to get you a quick - console for userspace. Do NOT enable in production kernels. + bool "udbg based fake hypervisor console" + depends on PPC + select HVC_DRIVER + help + This is meant to be used during HW bring up or debugging when + no other console mechanism exist but udbg, to get you a quick + console for userspace. Do NOT enable in production kernels. config HVC_DCC - bool "ARM JTAG DCC console" - depends on ARM - select HVC_DRIVER - help - This console uses the JTAG DCC on ARM to create a console under the HVC - driver. This console is used through a JTAG only on ARM. If you don't have - a JTAG then you probably don't want this option. - -config HVC_BFIN_JTAG - bool "Blackfin JTAG console" - depends on BLACKFIN + bool "ARM JTAG DCC console" + depends on ARM || ARM64 select HVC_DRIVER + select SERIAL_CORE_CONSOLE help - This console uses the Blackfin JTAG to create a console under the - the HVC driver. If you don't have JTAG, then you probably don't - want this option. + This console uses the JTAG DCC on ARM to create a console under the HVC + driver. This console is used through a JTAG only on ARM. If you don't have + a JTAG then you probably don't want this option. + +config HVC_DCC_SERIALIZE_SMP + bool "Use DCC only on CPU core 0" + depends on SMP && HVC_DCC + help + This is a DEBUG option to serialize all console input and output to CPU 0. + Some external debuggers, do not handle reads/writes from/to DCC on more + than one CPU core. Each core has its own DCC device registers, so when a + CPU core reads or writes from/to DCC, it only accesses its own DCC device. + Since kernel code can run on any CPU core, every time the kernel wants to + write to the console, it might write to a different DCC. + + In SMP mode, external debuggers create multiple windows, and each window + shows the DCC output only from that core's DCC. The result is that + console output is either lost or scattered across windows. + + Enable this option only if you are sure that you do not need features like + CPU hotplug to work. For example, during early chipset bringups without + debug serial console support. If unsure, say N. + +config HVC_RISCV_SBI + bool "RISC-V SBI console support" + depends on RISCV_SBI && NONPORTABLE + select HVC_DRIVER + help + This enables support for console output via RISC-V SBI calls, which + is normally used only during boot to output printk. This driver + conflicts with real console drivers and should not be enabled on + systems that directly access the console. + + If you don't know what do to here, say N. config HVCS tristate "IBM Hypervisor Virtual Console Server support" @@ -120,5 +134,3 @@ config HVCS will depend on arch specific APIs exported from hvcserver.ko which will also be compiled when this driver is built as a module. - -endif # TTY |