103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/*
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* Copyright (C) 2006, Intel Corporation
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*
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* This file is part of irqbalance
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*
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* This program file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program in a file named COPYING; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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/*
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* This file tries to map numa affinity of pci devices to their interrupts
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* In addition the PCI class information is used to refine the classification
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* of interrupt sources
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*/
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#include "config.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include "irqbalance.h"
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void pci_numa_scan(void)
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{
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DIR *dir;
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struct dirent *entry;
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cpumask_t mask;
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char line[PATH_MAX];
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FILE *file;
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int irq;
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unsigned int class;
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dir = opendir("/sys/bus/pci/devices");
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if (!dir)
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return;
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do {
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int type;
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entry = readdir(dir);
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if (!entry)
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break;
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if (strlen(entry->d_name)<3)
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continue;
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sprintf(line,"/sys/bus/pci/devices/%s/irq", entry->d_name);
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file = fopen(line, "r");
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if (!file)
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continue;
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if (fgets(line, PATH_MAX, file)==NULL)
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line[0]=0;
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fclose(file);
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irq = strtoul(line, NULL, 10);
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if (!irq)
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continue;
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sprintf(line,"/sys/bus/pci/devices/%s/class", entry->d_name);
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file = fopen(line, "r");
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if (!file)
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continue;
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if (fgets(line, PATH_MAX, file)==NULL)
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line[0]=0;
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fclose(file);
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class = strtoul(line, NULL, 16);
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sprintf(line,"/sys/bus/pci/devices/%s/local_cpus", entry->d_name);
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file = fopen(line, "r");
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if (!file)
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continue;
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if (fgets(line, PATH_MAX, file)==NULL)
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line[0]=0;
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fclose(file);
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cpumask_parse_user(line, strlen(line), mask);
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type = IRQ_OTHER;
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if ((class>>16) == 0x01)
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type = IRQ_SCSI;
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/*
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* Ethernet gets the type via /proc/net/dev; in addition down'd interfaces
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* shouldn't boost interrupts
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if ((class>>16) == 0x02)
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type = IRQ_ETH;
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*/
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if ((class>>16) >= 0x03 && (class>>16) <= 0x0C)
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type = IRQ_LEGACY;
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add_interrupt_numa(irq, mask, type);
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} while (entry);
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closedir(dir);
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}
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