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Date: Fri, 24 Feb 2012 16:19:12 +0100
From: Andreas Herrmann <andreas.herrmann3@....com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
CC: <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] x86/amd: Restore early_fill_mp_bus_to_node
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
PCI busses and associated devices.
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;
+
/* 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;
--
1.7.8.4
--
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