linux-kernel - Re: [PATCH v5 2/4] x86: add support for earlyprintk via USB3 debug port

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Date:   Thu, 19 Jan 2017 10:38:34 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, tglx@...utronix.de,
        peterz@...radead.org, linux-usb@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] x86: add support for earlyprintk via USB3 debug
 port


* Lu Baolu <baolu.lu@...ux.intel.com> wrote:

> index 8a12199..c4031b9 100644
> --- a/arch/x86/kernel/early_printk.c
> +++ b/arch/x86/kernel/early_printk.c
> @@ -17,6 +17,7 @@
>  #include <asm/intel-mid.h>
>  #include <asm/pgtable.h>
>  #include <linux/usb/ehci_def.h>
> +#include <linux/usb/xhci-dbgp.h>
>  #include <linux/efi.h>
>  #include <asm/efi.h>
>  #include <asm/pci_x86.h>
> @@ -381,6 +382,10 @@ static int __init setup_early_printk(char *buf)
>  		if (!strncmp(buf, "efi", 3))
>  			early_console_register(&early_efi_console, keep);
>  #endif
> +#ifdef CONFIG_EARLY_PRINTK_XDBC
> +		if (!strncmp(buf, "xdbc", 4))
> +			early_xdbc_parse_parameter(buf + 4);
> +#endif
>  
>  		buf++;
>  	}
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 9c337b0..09d4a56 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -70,6 +70,8 @@
>  #include <linux/tboot.h>
>  #include <linux/jiffies.h>
>  
> +#include <linux/usb/xhci-dbgp.h>
> +
>  #include <video/edid.h>
>  
>  #include <asm/mtrr.h>
> @@ -1096,6 +1098,11 @@ void __init setup_arch(char **cmdline_p)
>  	memblock_set_current_limit(ISA_END_ADDRESS);
>  	memblock_x86_fill();
>  
> +#ifdef CONFIG_EARLY_PRINTK_XDBC
> +	if (!early_xdbc_setup_hardware())
> +		early_xdbc_register_console();
> +#endif
> +
>  	reserve_bios_regions();
>  
>  	if (efi_enabled(EFI_MEMMAP)) {
> -- 
> 2.1.4

Please create proper wrappers in xhci-dbgp.h to not litter generic code with these
#ifdefs.

Thanks,

	Ingo