linux-kernel - Re: SNB PCI root information

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Message-ID: <CAE9FiQVncAVLGNDQYxGBxid=_PpLbzouGELHumnqvQ9_d1v3SA@mail.gmail.com>
Date:	Thu, 21 Jun 2012 11:11:20 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ulrich Drepper <drepper@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, jbarnes@...tuousgeek.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lenb@...nel.org, x86@...nel.org, linux-pci@...r.kernel.org
Subject: Re: SNB PCI root information

On Thu, Jun 21, 2012 at 9:22 AM, Ulrich Drepper <drepper@...il.com> wrote:
> On Thu, Jun 21, 2012 at 8:17 AM, Ulrich Drepper <drepper@...il.com> wrote:
>> On Wed, Jun 20, 2012 at 11:50 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>> please check -v3, and it will add 40 lines.
>>
>> Won't this version print out something like
>>
>>  PCI: unknown option `busnum_node=xx:yy'
>
> It does.

yes, but only when you have pci=busnum_node...

i changed grammar to only "busnum_node=..."

>
> If you apply the following patch on top of your version 3 patch it
> seems to work and is slightly more efficient.
>
>
> Signed-off-by: Ulrich Drepper <drepper@...il.com>
>
> diff -u b/arch/x86/pci/common.c b/arch/x86/pci/common.c
> --- b/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -494,16 +494,22 @@
>        return 0;
>  }
>
> +static const char *busnum_node_param;
> +
> +static void remember_busnum_node(const char *str)
> +{
> +       busnum_node_param = str;
> +}
> +
>  int get_user_busnum_node(int busnum)
>  {
>        int bus, node, count;
> -       char *p;
> +       const char *p;
>
> -       p = strstr(boot_command_line, "busnum_node=");
> +       p = busnum_node_param;
>        if (!p)
>                return -1;
>
> -       p += 12; /* strlen("busnum_node=") */
>        while (*p) {
>                count = 0;
>                if (sscanf(p, "%x:%x%n", &bus, &node, &count) != 2) {
> @@ -607,6 +613,9 @@
>        } else if (!strcmp(str, "nocrs")) {
>                pci_probe |= PCI_ROOT_NO_CRS;
>                return NULL;
> +       } else if (!strncmp(str, "busnum_node=", 12)) {
> +               remember_busnum_node(str + 12);
> +               return NULL;
>        } else if (!strcmp(str, "earlydump")) {
>                pci_early_dump_regs = 1;
>                return NULL;

Yes, that would be better.

Thanks

Yinghai
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