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0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ASM_X86_IO_APIC_H
0003 #define _ASM_X86_IO_APIC_H
0004 
0005 #include <linux/types.h>
0006 #include <asm/mpspec.h>
0007 #include <asm/apicdef.h>
0008 #include <asm/irq_vectors.h>
0009 #include <asm/x86_init.h>
0010 /*
0011  * Intel IO-APIC support for SMP and UP systems.
0012  *
0013  * Copyright (C) 1997, 1998, 1999, 2000 Ingo Molnar
0014  */
0015 
0016 /*
0017  * The structure of the IO-APIC:
0018  */
0019 union IO_APIC_reg_00 {
0020     u32 raw;
0021     struct {
0022         u32 __reserved_2    : 14,
0023             LTS     :  1,
0024             delivery_type   :  1,
0025             __reserved_1    :  8,
0026             ID      :  8;
0027     } __attribute__ ((packed)) bits;
0028 };
0029 
0030 union IO_APIC_reg_01 {
0031     u32 raw;
0032     struct {
0033         u32 version     :  8,
0034             __reserved_2    :  7,
0035             PRQ     :  1,
0036             entries     :  8,
0037             __reserved_1    :  8;
0038     } __attribute__ ((packed)) bits;
0039 };
0040 
0041 union IO_APIC_reg_02 {
0042     u32 raw;
0043     struct {
0044         u32 __reserved_2    : 24,
0045             arbitration :  4,
0046             __reserved_1    :  4;
0047     } __attribute__ ((packed)) bits;
0048 };
0049 
0050 union IO_APIC_reg_03 {
0051     u32 raw;
0052     struct {
0053         u32 boot_DT     :  1,
0054             __reserved_1    : 31;
0055     } __attribute__ ((packed)) bits;
0056 };
0057 
0058 struct IO_APIC_route_entry {
0059     union {
0060         struct {
0061             u64 vector          :  8,
0062                 delivery_mode       :  3,
0063                 dest_mode_logical   :  1,
0064                 delivery_status     :  1,
0065                 active_low      :  1,
0066                 irr         :  1,
0067                 is_level        :  1,
0068                 masked          :  1,
0069                 reserved_0      : 15,
0070                 reserved_1      : 17,
0071                 virt_destid_8_14    :  7,
0072                 destid_0_7      :  8;
0073         };
0074         struct {
0075             u64 ir_shared_0     :  8,
0076                 ir_zero         :  3,
0077                 ir_index_15     :  1,
0078                 ir_shared_1     :  5,
0079                 ir_reserved_0       : 31,
0080                 ir_format       :  1,
0081                 ir_index_0_14       : 15;
0082         };
0083         struct {
0084             u64 w1          : 32,
0085                 w2          : 32;
0086         };
0087     };
0088 } __attribute__ ((packed));
0089 
0090 struct irq_alloc_info;
0091 struct ioapic_domain_cfg;
0092 
0093 #define IOAPIC_MAP_ALLOC        0x1
0094 #define IOAPIC_MAP_CHECK        0x2
0095 
0096 #ifdef CONFIG_X86_IO_APIC
0097 
0098 /*
0099  * # of IO-APICs and # of IRQ routing registers
0100  */
0101 extern int nr_ioapics;
0102 
0103 extern int mpc_ioapic_id(int ioapic);
0104 extern unsigned int mpc_ioapic_addr(int ioapic);
0105 
0106 /* # of MP IRQ source entries */
0107 extern int mp_irq_entries;
0108 
0109 /* MP IRQ source entries */
0110 extern struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
0111 
0112 /* 1 if "noapic" boot option passed */
0113 extern int skip_ioapic_setup;
0114 
0115 /* 1 if "noapic" boot option passed */
0116 extern int noioapicquirk;
0117 
0118 /* -1 if "noapic" boot option passed */
0119 extern int noioapicreroute;
0120 
0121 extern u32 gsi_top;
0122 
0123 extern unsigned long io_apic_irqs;
0124 
0125 #define IO_APIC_IRQ(x) (((x) >= NR_IRQS_LEGACY) || ((1 << (x)) & io_apic_irqs))
0126 
0127 /*
0128  * If we use the IO-APIC for IRQ routing, disable automatic
0129  * assignment of PCI IRQ's.
0130  */
0131 #define io_apic_assign_pci_irqs \
0132     (mp_irq_entries && !skip_ioapic_setup && io_apic_irqs)
0133 
0134 struct irq_cfg;
0135 extern void ioapic_insert_resources(void);
0136 extern int arch_early_ioapic_init(void);
0137 
0138 extern int save_ioapic_entries(void);
0139 extern void mask_ioapic_entries(void);
0140 extern int restore_ioapic_entries(void);
0141 
0142 extern void setup_ioapic_ids_from_mpc(void);
0143 extern void setup_ioapic_ids_from_mpc_nocheck(void);
0144 
0145 extern int mp_find_ioapic(u32 gsi);
0146 extern int mp_find_ioapic_pin(int ioapic, u32 gsi);
0147 extern int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
0148                  struct irq_alloc_info *info);
0149 extern void mp_unmap_irq(int irq);
0150 extern int mp_register_ioapic(int id, u32 address, u32 gsi_base,
0151                   struct ioapic_domain_cfg *cfg);
0152 extern int mp_unregister_ioapic(u32 gsi_base);
0153 extern int mp_ioapic_registered(u32 gsi_base);
0154 
0155 extern void ioapic_set_alloc_attr(struct irq_alloc_info *info,
0156                   int node, int trigger, int polarity);
0157 
0158 extern void mp_save_irq(struct mpc_intsrc *m);
0159 
0160 extern void disable_ioapic_support(void);
0161 
0162 extern void __init io_apic_init_mappings(void);
0163 extern unsigned int native_io_apic_read(unsigned int apic, unsigned int reg);
0164 extern void native_restore_boot_irq_mode(void);
0165 
0166 static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
0167 {
0168     return x86_apic_ops.io_apic_read(apic, reg);
0169 }
0170 
0171 extern void setup_IO_APIC(void);
0172 extern void enable_IO_APIC(void);
0173 extern void clear_IO_APIC(void);
0174 extern void restore_boot_irq_mode(void);
0175 extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
0176 extern void print_IO_APICs(void);
0177 #else  /* !CONFIG_X86_IO_APIC */
0178 
0179 #define IO_APIC_IRQ(x)      0
0180 #define io_apic_assign_pci_irqs 0
0181 #define setup_ioapic_ids_from_mpc x86_init_noop
0182 static inline void ioapic_insert_resources(void) { }
0183 static inline int arch_early_ioapic_init(void) { return 0; }
0184 static inline void print_IO_APICs(void) {}
0185 #define gsi_top (NR_IRQS_LEGACY)
0186 static inline int mp_find_ioapic(u32 gsi) { return 0; }
0187 static inline int mp_map_gsi_to_irq(u32 gsi, unsigned int flags,
0188                     struct irq_alloc_info *info)
0189 {
0190     return gsi;
0191 }
0192 
0193 static inline void mp_unmap_irq(int irq) { }
0194 
0195 static inline int save_ioapic_entries(void)
0196 {
0197     return -ENOMEM;
0198 }
0199 
0200 static inline void mask_ioapic_entries(void) { }
0201 static inline int restore_ioapic_entries(void)
0202 {
0203     return -ENOMEM;
0204 }
0205 
0206 static inline void mp_save_irq(struct mpc_intsrc *m) { }
0207 static inline void disable_ioapic_support(void) { }
0208 static inline void io_apic_init_mappings(void) { }
0209 #define native_io_apic_read     NULL
0210 #define native_restore_boot_irq_mode    NULL
0211 
0212 static inline void setup_IO_APIC(void) { }
0213 static inline void enable_IO_APIC(void) { }
0214 static inline void restore_boot_irq_mode(void) { }
0215 
0216 #endif
0217 
0218 #endif /* _ASM_X86_IO_APIC_H */
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