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tty: hvc: Don't enable the RISC-V SBI console by default

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The new SBI console has the same problem as the old one: there's only
one shared backing hardware and no synchronization, so the two drivers
end up stepping on each other.  This was the same issue the old SBI-0.1
console drivers had, but that was disabled by default when SBI-0.1 was.

So just mark the new driver as nonportable.

Reported-by: Emil Renner Berthing <kernel@esmil.dk>
Fixes: 88ead68e76 ("tty: Add SBI debug console support to HVC SBI driver")
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240214153429.16484-2-palmer@rivosinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Palmer Dabbelt 2024-02-14 07:34:30 -08:00 committed by Greg Kroah-Hartman
parent b401b62175
commit 8b79d4e994
1 changed files with 5 additions and 3 deletions
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8
drivers/tty/hvc/Kconfig
View file

@ -108,13 +108,15 @@ config HVC_DCC_SERIALIZE_SMP
config HVC_RISCV_SBI
bool "RISC-V SBI console support"
depends on RISCV_SBI
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.
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 Y.
If you don't know what do to here, say N.
config HVCS
tristate "IBM Hypervisor Virtual Console Server support"