871d5f8dd0
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>
23 lines
430 B
C
23 lines
430 B
C
#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/topology.h>
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#define BUS_NR 256
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static unsigned char mp_bus_to_node[BUS_NR];
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void set_mp_bus_to_node(int busnum, int node)
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{
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if (busnum >= 0 && busnum < BUS_NR)
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mp_bus_to_node[busnum] = (unsigned char) node;
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}
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int get_mp_bus_to_node(int busnum)
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{
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int node;
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if (busnum < 0 || busnum > (BUS_NR - 1))
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return 0;
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node = mp_bus_to_node[busnum];
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return node;
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}
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