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Message-ID: <CAErSpo7gkkqZgR0TZ5Xx162pLN9ZaYVhMmyHn+H8Lqr1CBSXXQ@mail.gmail.com>
Date: Wed, 2 May 2012 11:33:17 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Andreas Herrmann <andreas.herrmann3@....com>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>, Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 1/2][RESEND] x86/pci/amd: Restore early_fill_mp_bus_to_node
On Fri, Apr 27, 2012 at 8:36 AM, Andreas Herrmann
<andreas.herrmann3@....com> wrote:
>
> Once upon a time this function was overloaded with quirky stuff to fix
> resource detection on systems w/ _CRS defects (seems that some Sun and
> HP systems were affected).
>
> See commit 30a18d6c3f1e774de656ebd8ff219d53e2ba4029
> (x86: multi pci root bus with different io resource range, on 64-bit)
>
> Restore the old function and thus decouple it from the quirk that is
> CPU family specific (e.g. it won't work on AMD family 15h CPUs). BTW,
> I assume that the _CRS stuff is working on current systems.
>
> This is required to properly initilize the numa_node information of
> existing PCI busses and associated devices.
I applied some of Yinghai's patches that also touch this area. Can
you refresh these so they apply on top of my "next" branch
(git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next)?
Can you also be more specific about what these patches fix?
My understanding is that amd_bus.c (1) sets NUMA info with
set_mp_bus_to_node() and (2) figures out MMIO and I/O port apertures,
which are only used when blind probing and when ignoring _CRS.
It seems like the main change in this patch is that we skip (2)
completely when family >= 0x11, and I don't understand what that could
fix.
[more comments below]
> Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
> ---
> arch/x86/pci/amd_bus.c | 84 +++++++++++++++++++++++++++++++----------------
> 1 files changed, 55 insertions(+), 29 deletions(-)
>
> diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
> index 0567df3..0384e69 100644
> --- a/arch/x86/pci/amd_bus.c
> +++ b/arch/x86/pci/amd_bus.c
> @@ -30,36 +30,19 @@ static struct pci_hostbridge_probe pci_probes[] __initdata = {
> { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1300 },
> };
>
> -#define RANGE_NUM 16
> -
> /**
> * early_fill_mp_bus_to_node()
> * called before pcibios_scan_root and pci_scan_bus
> * fills the mp_bus_to_cpumask array based according to the LDT Bus Number
> * Registers found in the K8 northbridge
> */
> -static int __init early_fill_mp_bus_info(void)
> +static int __init early_fill_mp_bus_to_node(void)
> {
> - int i;
> - int j;
> - unsigned bus;
> - unsigned slot;
> - int node;
> - int link;
> - int def_node;
> - int def_link;
> + int i, j, node, link;
> + unsigned bus, slot;
> struct pci_root_info *info;
> u32 reg;
> - struct resource *res;
> - u64 start;
> - u64 end;
> - struct range range[RANGE_NUM];
> - u64 val;
> - u32 address;
> bool found;
> - struct resource fam10h_mmconf_res, *fam10h_mmconf;
> - u64 fam10h_mmconf_start;
> - u64 fam10h_mmconf_end;
>
> if (!early_pci_allowed())
> return -1;
> @@ -67,8 +50,7 @@ static int __init early_fill_mp_bus_info(void)
> found = false;
> for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
> u32 id;
> - u16 device;
> - u16 vendor;
> + u16 device, vendor;
>
> bus = pci_probes[i].bus;
> slot = pci_probes[i].slot;
> @@ -88,8 +70,7 @@ static int __init early_fill_mp_bus_info(void)
>
> pci_root_num = 0;
> for (i = 0; i < 4; i++) {
> - int min_bus;
> - int max_bus;
> + int min_bus, max_bus;
> reg = read_pci_config(bus, slot, 1, 0xe0 + (i << 2));
>
> /* Check if that register is enabled for bus range */
> @@ -111,9 +92,50 @@ static int __init early_fill_mp_bus_info(void)
> info->node = node;
> info->link = link;
> sprintf(info->name, "PCI Bus #%02x", min_bus);
> + printk(KERN_DEBUG "bus: [%02x, %02x] on node %x link %x\n",
> + info->bus_min, info->bus_max, info->node, info->link);
> pci_root_num++;
> }
>
> + return 0;
> +}
> +
> +
> +#define RANGE_NUM 16
> +static int __init early_fill_mp_bus_info(void)
> +{
> + int i, j, node, link, def_node, def_link;
> + unsigned bus, slot;
> + struct pci_root_info *info;
> + struct resource *res;
> + struct resource fam10h_mmconf_res, *fam10h_mmconf;
> + struct range range[RANGE_NUM];
> + u64 fam10h_mmconf_start, fam10h_mmconf_end;
> + u64 start, end, val;
> + u32 reg, address;
> + bool found;
> +
> + found = false;
> + for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
> + u32 id;
> + u16 device, vendor;
> +
> + bus = pci_probes[i].bus;
> + slot = pci_probes[i].slot;
> + id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
> +
> + vendor = id & 0xffff;
> + device = (id>>16) & 0xffff;
> + if (pci_probes[i].vendor == vendor &&
> + pci_probes[i].device == device) {
> + found = true;
> + break;
> + }
> + }
> +
> + if (!found)
> + return 0;
Please factor this out to a separate function. Your current patch
leaves us with two identical copies of the "search pci_probes" loop.
Please make the refactoring its own separate patch.
Or maybe even better, maybe you could just leave everything in
early_fill_mp_bus_info(), and return after doing the
set_mp_bus_to_node() stuff if you want to skip the rest, i.e.,
for (i = 0; i < 4; i++) {
...
set_mp_bus_range_to_node(...);
...
}
if (boot_cpu_data.x86 >= 0x11)
return;
/* get the default node and link for left over res */
...
> +
> /* get the default node and link for left over res */
> reg = read_pci_config(bus, slot, 0, 0x60);
> def_node = (reg >> 8) & 0x07;
> @@ -310,14 +332,11 @@ static int __init early_fill_mp_bus_info(void)
> }
>
> for (i = 0; i < pci_root_num; i++) {
> - int res_num;
> - int busnum;
> + int res_num, busnum;
>
> info = &pci_root_info[i];
> res_num = info->res_num;
> busnum = info->bus_min;
> - printk(KERN_DEBUG "bus: [%02x, %02x] on node %x link %x\n",
> - info->bus_min, info->bus_max, info->node, info->link);
> for (j = 0; j < res_num; j++) {
> res = &info->res[j];
> printk(KERN_DEBUG "bus: %02x index %x %pR\n",
> @@ -412,7 +431,14 @@ static int __init amd_postcore_init(void)
> if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
> return 0;
>
> - early_fill_mp_bus_info();
> + if ((early_fill_mp_bus_to_node() == 0) &&
> + (boot_cpu_data.x86 < 0x11)) {
> + /*
> + * call this only on older systems w/o _CRS for "multi
> + * pci root bus"
> + */
> + early_fill_mp_bus_info();
> + }
> pci_io_ecs_init();
>
> return 0;
> --
> 1.7.8.5
>
>
>
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