include/linux/dmar.h

   1 /*
   2  * Copyright (c) 2006, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  15  * Place - Suite 330, Boston, MA 02111-1307 USA.
  16  *
  17  * Copyright (C) Ashok Raj <ashok.raj@intel.com>
  18  * Copyright (C) Shaohua Li <shaohua.li@intel.com>
  19  */
  20
  21 #ifndef __DMAR_H__
  22 #define __DMAR_H__
  23
  24 #include <linux/acpi.h>
  25 #include <linux/types.h>
  26 #include <linux/msi.h>
  27 #include <linux/irqreturn.h>
  28 #include <linux/rwsem.h>
  29 #include <linux/rculist.h>
  30
  31 struct acpi_dmar_header;
  32
  33 #ifdef  CONFIG_X86
  34 # define        DMAR_UNITS_SUPPORTED    MAX_IO_APICS
  35 #else
  36 # define        DMAR_UNITS_SUPPORTED    64
  37 #endif
  38
  39 /* DMAR Flags */
  40 #define DMAR_INTR_REMAP         0x1
  41 #define DMAR_X2APIC_OPT_OUT     0x2
  42 #define DMAR_PLATFORM_OPT_IN    0x4
  43
  44 struct intel_iommu;
  45
  46 struct dmar_dev_scope {
  47         struct device __rcu *dev;
  48         u8 bus;
  49         u8 devfn;
  50 };
  51
  52 #ifdef CONFIG_DMAR_TABLE
  53 extern struct acpi_table_header *dmar_tbl;
  54 struct dmar_drhd_unit {
  55         struct list_head list;          /* list of drhd units   */
  56         struct  acpi_dmar_header *hdr;  /* ACPI header          */
  57         u64     reg_base_addr;          /* register base address*/
  58         struct  dmar_dev_scope *devices;/* target device array  */
  59         int     devices_cnt;            /* target device count  */
  60         u16     segment;                /* PCI domain           */
  61         u8      ignored:1;              /* ignore drhd          */
  62         u8      include_all:1;
  63         struct intel_iommu *iommu;
  64 };
  65
  66 struct dmar_pci_path {
  67         u8 bus;
  68         u8 device;
  69         u8 function;
  70 };
  71
  72 struct dmar_pci_notify_info {
  73         struct pci_dev                  *dev;
  74         unsigned long                   event;
  75         int                             bus;
  76         u16                             seg;
  77         u16                             level;
  78         struct dmar_pci_path            path[];
  79 }  __attribute__((packed));
  80
  81 extern struct rw_semaphore dmar_global_lock;
  82 extern struct list_head dmar_drhd_units;
  83
  84 #define for_each_drhd_unit(drhd) \
  85         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)
  86
  87 #define for_each_active_drhd_unit(drhd)                                 \
  88         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)           \
  89                 if (drhd->ignored) {} else
  90
  91 #define for_each_active_iommu(i, drhd)                                  \
  92         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)           \
  93                 if (i=drhd->iommu, drhd->ignored) {} else
  94
  95 #define for_each_iommu(i, drhd)                                         \
  96         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)           \
  97                 if (i=drhd->iommu, 0) {} else
  98
  99 static inline bool dmar_rcu_check(void)
 100 {
 101         return rwsem_is_locked(&dmar_global_lock) ||
 102                system_state == SYSTEM_BOOTING;
 103 }
 104
 105 #define dmar_rcu_dereference(p) rcu_dereference_check((p), dmar_rcu_check())
 106
 107 #define for_each_dev_scope(a, c, p, d)  \
 108         for ((p) = 0; ((d) = (p) < (c) ? dmar_rcu_dereference((a)[(p)].dev) : \
 109                         NULL, (p) < (c)); (p)++)
 110
 111 #define for_each_active_dev_scope(a, c, p, d)   \
 112         for_each_dev_scope((a), (c), (p), (d))  if (!(d)) { continue; } else
 113
 114 extern int dmar_table_init(void);
 115 extern int dmar_dev_scope_init(void);
 116 extern void dmar_register_bus_notifier(void);
 117 extern int dmar_parse_dev_scope(void *start, void *end, int *cnt,
 118                                 struct dmar_dev_scope **devices, u16 segment);
 119 extern void *dmar_alloc_dev_scope(void *start, void *end, int *cnt);
 120 extern void dmar_free_dev_scope(struct dmar_dev_scope **devices, int *cnt);
 121 extern int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
 122                                  void *start, void*end, u16 segment,
 123                                  struct dmar_dev_scope *devices,
 124                                  int devices_cnt);
 125 extern int dmar_remove_dev_scope(struct dmar_pci_notify_info *info,
 126                                  u16 segment, struct dmar_dev_scope *devices,
 127                                  int count);
 128 /* Intel IOMMU detection */
 129 extern int detect_intel_iommu(void);
 130 extern int enable_drhd_fault_handling(void);
 131 extern int dmar_device_add(acpi_handle handle);
 132 extern int dmar_device_remove(acpi_handle handle);
 133
 134 static inline int dmar_res_noop(struct acpi_dmar_header *hdr, void *arg)
 135 {
 136         return 0;
 137 }
 138
 139 #ifdef CONFIG_INTEL_IOMMU
 140 extern int iommu_detected, no_iommu;
 141 extern int intel_iommu_init(void);
 142 extern int dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg);
 143 extern int dmar_parse_one_atsr(struct acpi_dmar_header *header, void *arg);
 144 extern int dmar_check_one_atsr(struct acpi_dmar_header *hdr, void *arg);
 145 extern int dmar_release_one_atsr(struct acpi_dmar_header *hdr, void *arg);
 146 extern int dmar_iommu_hotplug(struct dmar_drhd_unit *dmaru, bool insert);
 147 extern int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info);
 148 #else /* !CONFIG_INTEL_IOMMU: */
 149 static inline int intel_iommu_init(void) { return -ENODEV; }
 150
 151 #define dmar_parse_one_rmrr             dmar_res_noop
 152 #define dmar_parse_one_atsr             dmar_res_noop
 153 #define dmar_check_one_atsr             dmar_res_noop
 154 #define dmar_release_one_atsr           dmar_res_noop
 155
 156 static inline int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
 157 {
 158         return 0;
 159 }
 160
 161 static inline int dmar_iommu_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
 162 {
 163         return 0;
 164 }
 165 #endif /* CONFIG_INTEL_IOMMU */
 166
 167 #ifdef CONFIG_IRQ_REMAP
 168 extern int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert);
 169 #else  /* CONFIG_IRQ_REMAP */
 170 static inline int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
 171 { return 0; }
 172 #endif /* CONFIG_IRQ_REMAP */
 173
 174 extern bool dmar_platform_optin(void);
 175
 176 #else /* CONFIG_DMAR_TABLE */
 177
 178 static inline int dmar_device_add(void *handle)
 179 {
 180         return 0;
 181 }
 182
 183 static inline int dmar_device_remove(void *handle)
 184 {
 185         return 0;
 186 }
 187
 188 static inline bool dmar_platform_optin(void)
 189 {
 190         return false;
 191 }
 192
 193 #endif /* CONFIG_DMAR_TABLE */
 194
 195 struct irte {
 196         union {
 197                 /* Shared between remapped and posted mode*/
 198                 struct {
 199                         __u64   present         : 1,  /*  0      */
 200                                 fpd             : 1,  /*  1      */
 201                                 __res0          : 6,  /*  2 -  6 */
 202                                 avail           : 4,  /*  8 - 11 */
 203                                 __res1          : 3,  /* 12 - 14 */
 204                                 pst             : 1,  /* 15      */
 205                                 vector          : 8,  /* 16 - 23 */
 206                                 __res2          : 40; /* 24 - 63 */
 207                 };
 208
 209                 /* Remapped mode */
 210                 struct {
 211                         __u64   r_present       : 1,  /*  0      */
 212                                 r_fpd           : 1,  /*  1      */
 213                                 dst_mode        : 1,  /*  2      */
 214                                 redir_hint      : 1,  /*  3      */
 215                                 trigger_mode    : 1,  /*  4      */
 216                                 dlvry_mode      : 3,  /*  5 -  7 */
 217                                 r_avail         : 4,  /*  8 - 11 */
 218                                 r_res0          : 4,  /* 12 - 15 */
 219                                 r_vector        : 8,  /* 16 - 23 */
 220                                 r_res1          : 8,  /* 24 - 31 */
 221                                 dest_id         : 32; /* 32 - 63 */
 222                 };
 223
 224                 /* Posted mode */
 225                 struct {
 226                         __u64   p_present       : 1,  /*  0      */
 227                                 p_fpd           : 1,  /*  1      */
 228                                 p_res0          : 6,  /*  2 -  7 */
 229                                 p_avail         : 4,  /*  8 - 11 */
 230                                 p_res1          : 2,  /* 12 - 13 */
 231                                 p_urgent        : 1,  /* 14      */
 232                                 p_pst           : 1,  /* 15      */
 233                                 p_vector        : 8,  /* 16 - 23 */
 234                                 p_res2          : 14, /* 24 - 37 */
 235                                 pda_l           : 26; /* 38 - 63 */
 236                 };
 237                 __u64 low;
 238         };
 239
 240         union {
 241                 /* Shared between remapped and posted mode*/
 242                 struct {
 243                         __u64   sid             : 16,  /* 64 - 79  */
 244                                 sq              : 2,   /* 80 - 81  */
 245                                 svt             : 2,   /* 82 - 83  */
 246                                 __res3          : 44;  /* 84 - 127 */
 247                 };
 248
 249                 /* Posted mode*/
 250                 struct {
 251                         __u64   p_sid           : 16,  /* 64 - 79  */
 252                                 p_sq            : 2,   /* 80 - 81  */
 253                                 p_svt           : 2,   /* 82 - 83  */
 254                                 p_res3          : 12,  /* 84 - 95  */
 255                                 pda_h           : 32;  /* 96 - 127 */
 256                 };
 257                 __u64 high;
 258         };
 259 };
 260
 261 static inline void dmar_copy_shared_irte(struct irte *dst, struct irte *src)
 262 {
 263         dst->present    = src->present;
 264         dst->fpd        = src->fpd;
 265         dst->avail      = src->avail;
 266         dst->pst        = src->pst;
 267         dst->vector     = src->vector;
 268         dst->sid        = src->sid;
 269         dst->sq         = src->sq;
 270         dst->svt        = src->svt;
 271 }
 272
 273 #define PDA_LOW_BIT    26
 274 #define PDA_HIGH_BIT   32
 275
 276 /* Can't use the common MSI interrupt functions
 277  * since DMAR is not a pci device
 278  */
 279 struct irq_data;
 280 extern void dmar_msi_unmask(struct irq_data *data);
 281 extern void dmar_msi_mask(struct irq_data *data);
 282 extern void dmar_msi_read(int irq, struct msi_msg *msg);
 283 extern void dmar_msi_write(int irq, struct msi_msg *msg);
 284 extern int dmar_set_interrupt(struct intel_iommu *iommu);
 285 extern irqreturn_t dmar_fault(int irq, void *dev_id);
 286 extern int dmar_alloc_hwirq(int id, int node, void *arg);
 287 extern void dmar_free_hwirq(int irq);
 288
 289 #endif /* __DMAR_H__ */