mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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08f1c192c3
This patch introduces struct pci_sysdata to x86 and x86-64, and converts the existing two users (NUMA, Calgary) to use it. This lays the groundwork for having other users of sysdata, such as the PCI domains work. The Calgary bits are tested, the NUMA bits just look ok. Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
#include <linux/init.h>
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#include <linux/pci.h>
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#include <asm/mpspec.h>
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#include <linux/cpumask.h>
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/*
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* This discovers the pcibus <-> node mapping on AMD K8.
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*
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* RED-PEN need to call this again on PCI hotplug
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* RED-PEN empty cpus get reported wrong
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*/
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#define NODE_ID_REGISTER 0x60
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#define NODE_ID(dword) (dword & 0x07)
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#define LDT_BUS_NUMBER_REGISTER_0 0x94
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#define LDT_BUS_NUMBER_REGISTER_1 0xB4
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#define LDT_BUS_NUMBER_REGISTER_2 0xD4
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#define NR_LDT_BUS_NUMBER_REGISTERS 3
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#define SECONDARY_LDT_BUS_NUMBER(dword) ((dword >> 8) & 0xFF)
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#define SUBORDINATE_LDT_BUS_NUMBER(dword) ((dword >> 16) & 0xFF)
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#define PCI_DEVICE_ID_K8HTCONFIG 0x1100
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/**
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* fill_mp_bus_to_cpumask()
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* fills the mp_bus_to_cpumask array based according to the LDT Bus Number
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* Registers found in the K8 northbridge
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*/
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__init static int
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fill_mp_bus_to_cpumask(void)
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{
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struct pci_dev *nb_dev = NULL;
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int i, j;
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u32 ldtbus, nid;
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static int lbnr[3] = {
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LDT_BUS_NUMBER_REGISTER_0,
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LDT_BUS_NUMBER_REGISTER_1,
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LDT_BUS_NUMBER_REGISTER_2
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};
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while ((nb_dev = pci_get_device(PCI_VENDOR_ID_AMD,
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PCI_DEVICE_ID_K8HTCONFIG, nb_dev))) {
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pci_read_config_dword(nb_dev, NODE_ID_REGISTER, &nid);
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for (i = 0; i < NR_LDT_BUS_NUMBER_REGISTERS; i++) {
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pci_read_config_dword(nb_dev, lbnr[i], &ldtbus);
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/*
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* if there are no busses hanging off of the current
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* ldt link then both the secondary and subordinate
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* bus number fields are set to 0.
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*
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* RED-PEN
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* This is slightly broken because it assumes
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* HT node IDs == Linux node ids, which is not always
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* true. However it is probably mostly true.
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*/
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if (!(SECONDARY_LDT_BUS_NUMBER(ldtbus) == 0
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&& SUBORDINATE_LDT_BUS_NUMBER(ldtbus) == 0)) {
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for (j = SECONDARY_LDT_BUS_NUMBER(ldtbus);
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j <= SUBORDINATE_LDT_BUS_NUMBER(ldtbus);
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j++) {
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struct pci_bus *bus;
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struct pci_sysdata *sd;
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long node = NODE_ID(nid);
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/* Algorithm a bit dumb, but
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it shouldn't matter here */
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bus = pci_find_bus(0, j);
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if (!bus)
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continue;
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if (!node_online(node))
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node = 0;
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sd = bus->sysdata;
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sd->node = node;
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}
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}
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}
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}
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return 0;
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}
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fs_initcall(fill_mp_bus_to_cpumask);
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