arch/x86/include/asm/io_apic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_IO_APIC_H
   3 #define _ASM_X86_IO_APIC_H
   4
   5 #include <linux/types.h>
   6 #include <asm/mpspec.h>
   7 #include <asm/apicdef.h>
   8 #include <asm/irq_vectors.h>
   9 #include <asm/x86_init.h>
  10 /*
  11  * Intel IO-APIC support for SMP and UP systems.
  12  *
  13  * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
  14  */
  15
  16 /* I/O Unit Redirection Table */
  17 #define IO_APIC_REDIR_VECTOR_MASK       0x000FF
  18 #define IO_APIC_REDIR_DEST_LOGICAL      0x00800
  19 #define IO_APIC_REDIR_DEST_PHYSICAL     0x00000
  20 #define IO_APIC_REDIR_SEND_PENDING      (1 << 12)
  21 #define IO_APIC_REDIR_REMOTE_IRR        (1 << 14)
  22 #define IO_APIC_REDIR_LEVEL_TRIGGER     (1 << 15)
  23 #define IO_APIC_REDIR_MASKED            (1 << 16)
  24
  25 /*
  26  * The structure of the IO-APIC:
  27  */
  28 union IO_APIC_reg_00 {
  29         u32     raw;
  30         struct {
  31                 u32     __reserved_2    : 14,
  32                         LTS             :  1,
  33                         delivery_type   :  1,
  34                         __reserved_1    :  8,
  35                         ID              :  8;
  36         } __attribute__ ((packed)) bits;
  37 };
  38
  39 union IO_APIC_reg_01 {
  40         u32     raw;
  41         struct {
  42                 u32     version         :  8,
  43                         __reserved_2    :  7,
  44                         PRQ             :  1,
  45                         entries         :  8,
  46                         __reserved_1    :  8;
  47         } __attribute__ ((packed)) bits;
  48 };
  49
  50 union IO_APIC_reg_02 {
  51         u32     raw;
  52         struct {
  53                 u32     __reserved_2    : 24,
  54                         arbitration     :  4,
  55                         __reserved_1    :  4;
  56         } __attribute__ ((packed)) bits;
  57 };
  58
  59 union IO_APIC_reg_03 {
  60         u32     raw;
  61         struct {
  62                 u32     boot_DT         :  1,
  63                         __reserved_1    : 31;
  64         } __attribute__ ((packed)) bits;
  65 };
  66
  67 struct IO_APIC_route_entry {
  68         __u32   vector          :  8,
  69                 delivery_mode   :  3,   /* 000: FIXED
  70                                          * 001: lowest prio
  71                                          * 111: ExtINT
  72                                          */
  73                 dest_mode       :  1,   /* 0: physical, 1: logical */
  74                 delivery_status :  1,
  75                 polarity        :  1,
  76                 irr             :  1,
  77                 trigger         :  1,   /* 0: edge, 1: level */
  78                 mask            :  1,   /* 0: enabled, 1: disabled */
  79                 __reserved_2    : 15;
  80
  81         __u32   __reserved_3    : 24,
  82                 dest            :  8;
  83 } __attribute__ ((packed));
  84
  85 struct IR_IO_APIC_route_entry {
  86         __u64   vector          : 8,
  87                 zero            : 3,
  88                 index2          : 1,
  89                 delivery_status : 1,
  90                 polarity        : 1,
  91                 irr             : 1,
  92                 trigger         : 1,
  93                 mask            : 1,
  94                 reserved        : 31,
  95                 format          : 1,
  96                 index           : 15;
  97 } __attribute__ ((packed));
  98
  99 struct irq_alloc_info;
 100 struct ioapic_domain_cfg;
 101
 102 #define IOAPIC_AUTO                     -1
 103 #define IOAPIC_EDGE                     0
 104 #define IOAPIC_LEVEL                    1
 105
 106 #define IOAPIC_MASKED                   1
 107 #define IOAPIC_UNMASKED                 0
 108
 109 #define IOAPIC_POL_HIGH                 0
 110 #define IOAPIC_POL_LOW                  1
 111
 112 #define IOAPIC_DEST_MODE_PHYSICAL       0
 113 #define IOAPIC_DEST_MODE_LOGICAL        1
 114
 115 #define IOAPIC_MAP_ALLOC                0x1
 116 #define IOAPIC_MAP_CHECK                0x2
 117
 118 #ifdef CONFIG_X86_IO_APIC
 119
 120 /*
 121  * # of IO-APICs and # of IRQ routing registers
 122  */
 123 extern int nr_ioapics;
 124
 125 extern int mpc_ioapic_id(int ioapic);
 126 extern unsigned int mpc_ioapic_addr(int ioapic);
 127
 128 /* # of MP IRQ source entries */
 129 extern int mp_irq_entries;
 130
 131 /* MP IRQ source entries */
 132 extern struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
 133
 134 /* 1 if "noapic" boot option passed */
 135 extern int skip_ioapic_setup;
 136
 137 /* 1 if "noapic" boot option passed */
 138 extern int noioapicquirk;
 139
 140 /* -1 if "noapic" boot option passed */
 141 extern int noioapicreroute;
 142
 143 extern u32 gsi_top;
 144
 145 extern unsigned long io_apic_irqs;
 146
 147 #define IO_APIC_IRQ(x) (((x) >= NR_IRQS_LEGACY) || ((1 << (x)) & io_apic_irqs))
 148
 149 /*
 150  * If we use the IO-APIC for IRQ routing, disable automatic
 151  * assignment of PCI IRQ's.
 152  */
 153 #define io_apic_assign_pci_irqs \
 154         (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
 155
 156 struct irq_cfg;
 157 extern void ioapic_insert_resources(void);
 158 extern int arch_early_ioapic_init(void);
 159
 160 extern int save_ioapic_entries(void);
 161 extern void mask_ioapic_entries(void);
 162 extern int restore_ioapic_entries(void);
 163
 164 extern void setup_ioapic_ids_from_mpc(void);
 165 extern void setup_ioapic_ids_from_mpc_nocheck(void);
 166
 167 extern int mp_find_ioapic(u32 gsi);
 168 extern int mp_find_ioapic_pin(int ioapic, u32 gsi);
 169 extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
 170                              struct irq_alloc_info *info);
 171 extern void mp_unmap_irq(int irq);
 172 extern int mp_register_ioapic(int id, u32 address, u32 gsi_base,
 173                               struct ioapic_domain_cfg *cfg);
 174 extern int mp_unregister_ioapic(u32 gsi_base);
 175 extern int mp_ioapic_registered(u32 gsi_base);
 176
 177 extern void ioapic_set_alloc_attr(struct irq_alloc_info *info,
 178                                   int node, int trigger, int polarity);
 179
 180 extern void mp_save_irq(struct mpc_intsrc *m);
 181
 182 extern void disable_ioapic_support(void);
 183
 184 extern void __init io_apic_init_mappings(void);
 185 extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
 186 extern void native_disable_io_apic(void);
 187
 188 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 189 {
 190         return x86_io_apic_ops.read(apic, reg);
 191 }
 192
 193 extern void setup_IO_APIC(void);
 194 extern void enable_IO_APIC(void);
 195 extern void disable_IO_APIC(void);
 196 extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
 197 extern void print_IO_APICs(void);
 198 #else  /* !CONFIG_X86_IO_APIC */
 199
 200 #define IO_APIC_IRQ(x)          0
 201 #define io_apic_assign_pci_irqs 0
 202 #define setup_ioapic_ids_from_mpc x86_init_noop
 203 static inline void ioapic_insert_resources(void) { }
 204 static inline int arch_early_ioapic_init(void) { return 0; }
 205 static inline void print_IO_APICs(void) {}
 206 #define gsi_top (NR_IRQS_LEGACY)
 207 static inline int mp_find_ioapic(u32 gsi) { return 0; }
 208 static inline int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
 209                                     struct irq_alloc_info *info)
 210 {
 211         return gsi;
 212 }
 213
 214 static inline void mp_unmap_irq(int irq) { }
 215
 216 static inline int save_ioapic_entries(void)
 217 {
 218         return -ENOMEM;
 219 }
 220
 221 static inline void mask_ioapic_entries(void) { }
 222 static inline int restore_ioapic_entries(void)
 223 {
 224         return -ENOMEM;
 225 }
 226
 227 static inline void mp_save_irq(struct mpc_intsrc *m) { }
 228 static inline void disable_ioapic_support(void) { }
 229 static inline void io_apic_init_mappings(void) { }
 230 #define native_io_apic_read             NULL
 231 #define native_disable_io_apic          NULL
 232
 233 static inline void setup_IO_APIC(void) { }
 234 static inline void enable_IO_APIC(void) { }
 235
 236 #endif
 237
 238 #endif /* _ASM_X86_IO_APIC_H */