linux-kernel - Re: [PATCH 4/6] tty/serial: Add RISC-V SBI debug console based earlycon

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Message-ID: <CAK9=C2XDkYg4kVHFT4bLETBecSGgHkPaTW9wpzLEe_Fjg0UGVQ@mail.gmail.com>
Date:   Wed, 11 Oct 2023 11:22:00 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Conor Dooley <conor@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-serial@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] tty/serial: Add RISC-V SBI debug console based earlycon

On Tue, Oct 10, 2023 at 10:46 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Tue, Oct 10, 2023 at 10:35:01PM +0530, Anup Patel wrote:
> > We extend the existing RISC-V SBI earlycon support to use the new
> > RISC-V SBI debug console extension.
> >
> > Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> > ---
> >  drivers/tty/serial/Kconfig              |  2 +-
> >  drivers/tty/serial/earlycon-riscv-sbi.c | 35 ++++++++++++++++++++++---
> >  2 files changed, 32 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> > index bdc568a4ab66..cec46091a716 100644
> > --- a/drivers/tty/serial/Kconfig
> > +++ b/drivers/tty/serial/Kconfig
> > @@ -87,7 +87,7 @@ config SERIAL_EARLYCON_SEMIHOST
> >
> >  config SERIAL_EARLYCON_RISCV_SBI
> >       bool "Early console using RISC-V SBI"
> > -     depends on RISCV_SBI_V01
> > +     depends on RISCV_SBI
> >       select SERIAL_CORE
> >       select SERIAL_CORE_CONSOLE
> >       select SERIAL_EARLYCON
> > diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c
> > index 27afb0b74ea7..b1da34e8d8cd 100644
> > --- a/drivers/tty/serial/earlycon-riscv-sbi.c
> > +++ b/drivers/tty/serial/earlycon-riscv-sbi.c
> > @@ -10,22 +10,49 @@
> >  #include <linux/serial_core.h>
> >  #include <asm/sbi.h>
> >
> > +#ifdef CONFIG_RISCV_SBI_V01
> >  static void sbi_putc(struct uart_port *port, unsigned char c)
> >  {
> >       sbi_console_putchar(c);
> >  }
> >
> > -static void sbi_console_write(struct console *con,
> > -                           const char *s, unsigned n)
> > +static void sbi_0_1_console_write(struct console *con,
> > +                               const char *s, unsigned int n)
> >  {
> >       struct earlycon_device *dev = con->data;
> >       uart_console_write(&dev->port, s, n, sbi_putc);
> >  }
> > +#endif
> > +
> > +static void sbi_dbcn_console_write(struct console *con,
> > +                                const char *s, unsigned int n)
> > +{
> > +     phys_addr_t pa = __pa(s);
> > +
> > +     sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE,
> > +#ifdef CONFIG_32BIT
> > +               n, pa, (u64)pa >> 32,
> > +#else
> > +               n, pa, 0,
> > +#endif
>
> Again, no #ifdef in .c files please.

Okay, I will remove #ifdef from here as well.

>
> thanks,
>
> greg k-h

Thanks,
Anup