x86: get mp_bus_to_node early

Currently, on an amd k8 system with multi ht chains, the numa_node of
pci devices under /sys/devices/pci0000:80/* is always 0, even if that
chain is on node 1 or 2 or 3.

Workaround: pcibus_to_node(bus) is used when we want to get the node that
pci_device is on.

In struct device, we already have numa_node member, and we could use
dev_to_node()/set_dev_node() to get and set numa_node in the device.
set_dev_node is called in pci_device_add() with pcibus_to_node(bus),
and pcibus_to_node uses bus->sysdata for nodeid.

The problem is when pci_add_device is called, bus->sysdata is not assigned
correct nodeid yet. The result is that numa_node will always be 0.

pcibios_scan_root and pci_scan_root could take sysdata. So we need to get
mp_bus_to_node mapping before these two are called, and thus
get_mp_bus_to_node could get correct node for sysdata in root bus.

In scanning of the root bus, all child busses will take parent bus sysdata.
So all pci_device->dev.numa_node will be assigned correctly and automatically.

Later we could use dev_to_node(&pci_dev->dev) to get numa_node, and we
could also could make other bus specific device get the correct numa_node
too.

This is an updated version of pci_sysdata and Jeff's pci_domain patch.

[ mingo@elte.hu: build fix ]

Signed-off-by: Yinghai Lu <yinghai.lu@sun.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

7 files changed, 127 insertions, 42 deletions

diff --git a/arch/x86/pci/Makefile_32 b/arch/x86/pci/Makefile_32
index cdd6828b5ab..e9c5caf54e5 100644
--- a/arch/x86/pci/Makefile_32
+++ b/arch/x86/pci/Makefile_32
@@ -10,5 +10,6 @@ pci-y				+= legacy.o irq.o
 
 pci-$(CONFIG_X86_VISWS)         := visws.o fixup.o
 pci-$(CONFIG_X86_NUMAQ)         := numa.o irq.o
+pci-$(CONFIG_NUMA)              += mp_bus_to_node.o
 
 obj-y                           += $(pci-y) common.o early.o
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 2664cb3fc96..1a9c0c6a1a1 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -191,7 +191,10 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
 {
         struct pci_bus *bus;
         struct pci_sysdata *sd;
+        int node;
+#ifdef CONFIG_ACPI_NUMA
         int pxm;
+#endif
 
         dmi_check_system(acpi_pciprobe_dmi_table);
 
@@ -201,6 +204,17 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
                 return NULL;
         }
 
+        node = -1;
+#ifdef CONFIG_ACPI_NUMA
+        pxm = acpi_get_pxm(device->handle);
+        if (pxm >= 0)
+                node = pxm_to_node(pxm);
+        if (node != -1)
+                set_mp_bus_to_node(busnum, node);
+        else
+                node = get_mp_bus_to_node(busnum);
+#endif
+
         /* Allocate per-root-bus (not per bus) arch-specific data.
          * TODO: leak; this memory is never freed.
          * It's arguable whether it's worth the trouble to care.
@@ -212,13 +226,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
         }
 
         sd->domain = domain;
-        sd->node = -1;
-
-        pxm = acpi_get_pxm(device->handle);
-#ifdef CONFIG_ACPI_NUMA
-        if (pxm >= 0)
-                sd->node = pxm_to_node(pxm);
-#endif
+        sd->node = node;
         /*
          * Maybe the desired pci bus has been already scanned. In such case
          * it is unnecessary to scan the pci bus with the given domain,busnum.
@@ -238,9 +246,9 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
                 kfree(sd);
 
 #ifdef CONFIG_ACPI_NUMA
-        if (bus != NULL) {
+        if (bus) {
                 if (pxm >= 0) {
-                        printk("bus %d -> pxm %d -> node %d\n",
+                        printk(KERN_DEBUG "bus %02x -> pxm %d -> node %d\n",
                                 busnum, pxm, pxm_to_node(pxm));
                 }
         }
@@ -248,7 +256,6 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
 
         if (bus && (pci_probe & PCI_USE__CRS))
                 get_current_resources(device, busnum, domain, bus);
-        
         return bus;
 }
 
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 75fcc29ecf5..07d53184f7a 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -342,9 +342,14 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
                 return NULL;
         }
 
+        sd->node = get_mp_bus_to_node(busnum);
+
         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
+        bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
+        if (!bus)
+                kfree(sd);
 
-        return pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
+        return bus;
 }
 
 extern u8 pci_cache_line_size;
@@ -480,7 +485,7 @@ void pcibios_disable_device (struct pci_dev *dev)
                 pcibios_disable_irq(dev);
 }
 
-struct pci_bus *__devinit pci_scan_bus_with_sysdata(int busno)
+struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 {
         struct pci_bus *bus = NULL;
         struct pci_sysdata *sd;
@@ -495,10 +500,15 @@ struct pci_bus *__devinit pci_scan_bus_with_sysdata(int busno)
                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
                 return NULL;
         }
-        sd->node = -1;
-        bus = pci_scan_bus(busno, &pci_root_ops, sd);
+        sd->node = node;
+        bus = pci_scan_bus(busno, ops, sd);
         if (!bus)
                 kfree(sd);
 
         return bus;
 }
+
+struct pci_bus *pci_scan_bus_with_sysdata(int busno)
+{
+        return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
+}
diff --git a/arch/x86/pci/irq.c b/arch/x86/pci/irq.c
index 579745ca6b6..0908fca901b 100644
--- a/arch/x86/pci/irq.c
+++ b/arch/x86/pci/irq.c
@@ -136,9 +136,11 @@ static void __init pirq_peer_trick(void)
                 busmap[e->bus] = 1;
         }
         for(i = 1; i < 256; i++) {
+                int node;
                 if (!busmap[i] || pci_find_bus(0, i))
                         continue;
-                if (pci_scan_bus_with_sysdata(i))
+                node = get_mp_bus_to_node(i);
+                if (pci_scan_bus_on_node(i, &pci_root_ops, node))
                         printk(KERN_INFO "PCI: Discovered primary peer "
                                "bus %02x [IRQ]\n", i);
         }
diff --git a/arch/x86/pci/k8-bus_64.c b/arch/x86/pci/k8-bus_64.c
index 9cc813e2970..3903efbca53 100644
--- a/arch/x86/pci/k8-bus_64.c
+++ b/arch/x86/pci/k8-bus_64.c
@@ -1,7 +1,9 @@
 #include <linux/init.h>
 #include <linux/pci.h>
+#include <asm/pci-direct.h>
 #include <asm/mpspec.h>
 #include <linux/cpumask.h>
+#include <linux/topology.h>
 
 /*
  * This discovers the pcibus <-> node mapping on AMD K8.
@@ -20,64 +22,102 @@
 #define SUBORDINATE_LDT_BUS_NUMBER(dword) ((dword >> 16) & 0xFF)
 #define PCI_DEVICE_ID_K8HTCONFIG 0x1100
 
+#ifdef CONFIG_NUMA
+
+#define BUS_NR 256
+
+static int mp_bus_to_node[BUS_NR];
+
+void set_mp_bus_to_node(int busnum, int node)
+{
+        if (busnum >= 0 &&  busnum < BUS_NR)
+                mp_bus_to_node[busnum] = node;
+}
+
+int get_mp_bus_to_node(int busnum)
+{
+        int node = -1;
+
+        if (busnum < 0 || busnum > (BUS_NR - 1))
+                return node;
+
+        node = mp_bus_to_node[busnum];
+
+        /*
+         * let numa_node_id to decide it later in dma_alloc_pages
+         * if there is no ram on that node
+         */
+        if (node != -1 && !node_online(node))
+                node = -1;
+
+        return node;
+}
+
+#endif
+
 /**
- * fill_mp_bus_to_cpumask()
+ * 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
  */
 __init static int
-fill_mp_bus_to_cpumask(void)
+early_fill_mp_bus_to_node(void)
 {
-        struct pci_dev *nb_dev = NULL;
+#ifdef CONFIG_NUMA
         int i, j;
+        unsigned slot;
         u32 ldtbus, nid;
+        u32 id;
         static int lbnr[3] = {
                 LDT_BUS_NUMBER_REGISTER_0,
                 LDT_BUS_NUMBER_REGISTER_1,
                 LDT_BUS_NUMBER_REGISTER_2
         };
 
-        while ((nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
-                        PCI_DEVICE_ID_K8HTCONFIG, nb_dev))) {
-                pci_read_config_dword(nb_dev, NODE_ID_REGISTER, &nid);
+        for (i = 0; i < BUS_NR; i++)
+                mp_bus_to_node[i] = -1;
+
+        if (!early_pci_allowed())
+                return -1;
+
+        for (slot = 0x18; slot < 0x20; slot++) {
+                id = read_pci_config(0, slot, 0, PCI_VENDOR_ID);
+                if (id != (PCI_VENDOR_ID_AMD | (PCI_DEVICE_ID_K8HTCONFIG<<16)))
+                        break;
+                nid = read_pci_config(0, slot, 0, NODE_ID_REGISTER);
 
                 for (i = 0; i < NR_LDT_BUS_NUMBER_REGISTERS; i++) {
-                        pci_read_config_dword(nb_dev, lbnr[i], &ldtbus);
+                        ldtbus = read_pci_config(0, slot, 0, lbnr[i]);
                         /*
                          * if there are no busses hanging off of the current
                          * ldt link then both the secondary and subordinate
                          * bus number fields are set to 0.
-                         * 
+                         *
                          * RED-PEN
                          * This is slightly broken because it assumes
-                         * HT node IDs == Linux node ids, which is not always
+                         * HT node IDs == Linux node ids, which is not always
                          * true. However it is probably mostly true.
                          */
                         if (!(SECONDARY_LDT_BUS_NUMBER(ldtbus) == 0
                                 && SUBORDINATE_LDT_BUS_NUMBER(ldtbus) == 0)) {
                                 for (j = SECONDARY_LDT_BUS_NUMBER(ldtbus);
                                      j <= SUBORDINATE_LDT_BUS_NUMBER(ldtbus);
-                                     j++) { 
-                                        struct pci_bus *bus;
-                                        struct pci_sysdata *sd;
-
-                                        long node = NODE_ID(nid);
-                                        /* Algorithm a bit dumb, but
-                                           it shouldn't matter here */
-                                        bus = pci_find_bus(0, j);
-                                        if (!bus)
-                                                continue;
-                                        if (!node_online(node))
-                                                node = 0;
-
-                                        sd = bus->sysdata;
-                                        sd->node = node;
-                                }               
+                                     j++) {
+                                        int node = NODE_ID(nid);
+                                        mp_bus_to_node[j] = (unsigned char)node;
+                                }
                         }
                 }
         }
 
+        for (i = 0; i < BUS_NR; i++) {
+                int node = mp_bus_to_node[i];
+                if (node >= 0)
+                        printk(KERN_DEBUG "bus: %02x to node: %02x\n", i, node);
+        }
+#endif
         return 0;
 }
 
-fs_initcall(fill_mp_bus_to_cpumask);
+postcore_initcall(early_fill_mp_bus_to_node);
diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index e041ced0ce1..a67921ce60a 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -12,6 +12,7 @@
 static void __devinit pcibios_fixup_peer_bridges(void)
 {
         int n, devfn;
+        long node;
 
         if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
                 return;
@@ -21,12 +22,13 @@ static void __devinit pcibios_fixup_peer_bridges(void)
                 u32 l;
                 if (pci_find_bus(0, n))
                         continue;
+                node = get_mp_bus_to_node(n);
                 for (devfn = 0; devfn < 256; devfn += 8) {
                         if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
                             l != 0x0000 && l != 0xffff) {
                                 DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
                                 printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
-                                pci_scan_bus_with_sysdata(n);
+                                pci_scan_bus_on_node(n, &pci_root_ops, node);
                                 break;
                         }
                 }
diff --git a/arch/x86/pci/mp_bus_to_node.c b/arch/x86/pci/mp_bus_to_node.c
new file mode 100644
index 00000000000..022943999b8
--- /dev/null
+++ b/arch/x86/pci/mp_bus_to_node.c
@@ -0,0 +1,23 @@
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/topology.h>
+
+#define BUS_NR 256
+
+static unsigned char mp_bus_to_node[BUS_NR];
+
+void set_mp_bus_to_node(int busnum, int node)
+{
+        if (busnum >= 0 &&  busnum < BUS_NR)
+        mp_bus_to_node[busnum] = (unsigned char) node;
+}
+
+int get_mp_bus_to_node(int busnum)
+{
+        int node;
+
+        if (busnum < 0 || busnum > (BUS_NR - 1))
+                return 0;
+        node = mp_bus_to_node[busnum];
+        return node;
+}