LXR linux/arch/x86/platform/sfi/sfi.c

   1/*
   2 * sfi.c - x86 architecture SFI support.
   3 *
   4 * Copyright (c) 2009, Intel Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 *
  15 * You should have received a copy of the GNU General Public License along with
  16 * this program; if not, write to the Free Software Foundation, Inc.,
  17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18 *
  19 */
  20
  21#define KMSG_COMPONENT "SFI"
  22#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  23
  24#include <linux/acpi.h>
  25#include <linux/init.h>
  26#include <linux/sfi.h>
  27#include <linux/io.h>
  28#include <linux/irqdomain.h>
  29
  30#include <asm/io_apic.h>
  31#include <asm/mpspec.h>
  32#include <asm/setup.h>
  33#include <asm/apic.h>
  34
  35#ifdef CONFIG_X86_LOCAL_APIC
  36static unsigned long sfi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  37
  38/* All CPUs enumerated by SFI must be present and enabled */
  39static void __init mp_sfi_register_lapic(u8 id)
  40{
  41        if (MAX_LOCAL_APIC - id <= 0) {
  42                pr_warning("Processor #%d invalid (max %d)\n",
  43                        id, MAX_LOCAL_APIC);
  44                return;
  45        }
  46
  47        pr_info("registering lapic[%d]\n", id);
  48
  49        generic_processor_info(id, GET_APIC_VERSION(apic_read(APIC_LVR)));
  50}
  51
  52static int __init sfi_parse_cpus(struct sfi_table_header *table)
  53{
  54        struct sfi_table_simple *sb;
  55        struct sfi_cpu_table_entry *pentry;
  56        int i;
  57        int cpu_num;
  58
  59        sb = (struct sfi_table_simple *)table;
  60        cpu_num = SFI_GET_NUM_ENTRIES(sb, struct sfi_cpu_table_entry);
  61        pentry = (struct sfi_cpu_table_entry *)sb->pentry;
  62
  63        for (i = 0; i < cpu_num; i++) {
  64                mp_sfi_register_lapic(pentry->apic_id);
  65                pentry++;
  66        }
  67
  68        smp_found_config = 1;
  69        return 0;
  70}
  71#endif /* CONFIG_X86_LOCAL_APIC */
  72
  73#ifdef CONFIG_X86_IO_APIC
  74static struct irq_domain_ops sfi_ioapic_irqdomain_ops = {
  75        .map = mp_irqdomain_map,
  76};
  77
  78static int __init sfi_parse_ioapic(struct sfi_table_header *table)
  79{
  80        struct sfi_table_simple *sb;
  81        struct sfi_apic_table_entry *pentry;
  82        int i, num;
  83        struct ioapic_domain_cfg cfg = {
  84                .type = IOAPIC_DOMAIN_STRICT,
  85                .ops = &sfi_ioapic_irqdomain_ops,
  86        };
  87
  88        sb = (struct sfi_table_simple *)table;
  89        num = SFI_GET_NUM_ENTRIES(sb, struct sfi_apic_table_entry);
  90        pentry = (struct sfi_apic_table_entry *)sb->pentry;
  91
  92        for (i = 0; i < num; i++) {
  93                mp_register_ioapic(i, pentry->phys_addr, gsi_top, &cfg);
  94                pentry++;
  95        }
  96
  97        WARN(pic_mode, KERN_WARNING
  98                "SFI: pic_mod shouldn't be 1 when IOAPIC table is present\n");
  99        pic_mode = 0;
 100        return 0;
 101}
 102#endif /* CONFIG_X86_IO_APIC */
 103
 104/*
 105 * sfi_platform_init(): register lapics & io-apics
 106 */
 107int __init sfi_platform_init(void)
 108{
 109#ifdef CONFIG_X86_LOCAL_APIC
 110        register_lapic_address(sfi_lapic_addr);
 111        sfi_table_parse(SFI_SIG_CPUS, NULL, NULL, sfi_parse_cpus);
 112#endif
 113#ifdef CONFIG_X86_IO_APIC
 114        sfi_table_parse(SFI_SIG_APIC, NULL, NULL, sfi_parse_ioapic);
 115#endif
 116        return 0;
 117}
 118