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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
/*
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* legacy.c - traditional, old school PCI bus probing
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*/
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#include <linux/init.h>
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#include <linux/pci.h>
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#include "pci.h"
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/*
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* Discover remaining PCI buses in case there are peer host bridges.
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* We use the number of last PCI bus provided by the PCI BIOS.
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*/
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static void __devinit pcibios_fixup_peer_bridges(void)
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{
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int n, devfn;
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long node;
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if (pcibios_last_bus <= 0 || pcibios_last_bus >= 0xff)
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return;
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DBG("PCI: Peer bridge fixup\n");
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for (n=0; n <= pcibios_last_bus; n++) {
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u32 l;
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if (pci_find_bus(0, n))
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continue;
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node = get_mp_bus_to_node(n);
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for (devfn = 0; devfn < 256; devfn += 8) {
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if (!raw_pci_read(0, n, devfn, PCI_VENDOR_ID, 2, &l) &&
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l != 0x0000 && l != 0xffff) {
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DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
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printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
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pci_scan_bus_on_node(n, &pci_root_ops, node);
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break;
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}
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}
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}
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}
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static int __init pci_legacy_init(void)
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{
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if (!raw_pci_ops) {
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printk("PCI: System does not support PCI\n");
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return 0;
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}
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if (pcibios_scanned++)
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return 0;
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printk("PCI: Probing PCI hardware\n");
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pci_root_bus = pcibios_scan_root(0);
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if (pci_root_bus)
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pci_bus_add_devices(pci_root_bus);
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pcibios_fixup_peer_bridges();
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return 0;
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}
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subsys_initcall(pci_legacy_init);
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