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/rcupdate.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
  43 struct intel_iommu;
  44
  45 struct dmar_dev_scope {
  46         struct device __rcu *dev;
  47         u8 bus;
  48         u8 devfn;
  49 };
  50
  51 #ifdef CONFIG_DMAR_TABLE
  52 extern struct acpi_table_header *dmar_tbl;
  53 struct dmar_drhd_unit {
  54         struct list_head list;          /* list of drhd units   */
  55         struct  acpi_dmar_header *hdr;  /* ACPI header          */
  56         u64     reg_base_addr;          /* register base address*/
  57         struct  dmar_dev_scope *devices;/* target device array  */
  58         int     devices_cnt;            /* target device count  */
  59         u16     segment;                /* PCI domain           */
  60         u8      ignored:1;              /* ignore drhd          */
  61         u8      include_all:1;
  62         struct intel_iommu *iommu;
  63 };
  64
  65 struct dmar_pci_path {
  66         u8 bus;
  67         u8 device;
  68         u8 function;
  69 };
  70
  71 struct dmar_pci_notify_info {
  72         struct pci_dev                  *dev;
  73         unsigned long                   event;
  74         int                             bus;
  75         u16                             seg;
  76         u16                             level;
  77         struct dmar_pci_path            path[];
  78 }  __attribute__((packed));
  79
  80 extern struct rw_semaphore dmar_global_lock;
  81 extern struct list_head dmar_drhd_units;
  82
  83 #define for_each_drhd_unit(drhd) \
  84         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)
  85
  86 #define for_each_active_drhd_unit(drhd)                                 \
  87         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)           \
  88                 if (drhd->ignored) {} else
  89
  90 #define for_each_active_iommu(i, drhd)                                  \
  91         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)           \
  92                 if (i=drhd->iommu, drhd->ignored) {} else
  93
  94 #define for_each_iommu(i, drhd)                                         \
  95         list_for_each_entry_rcu(drhd, &dmar_drhd_units, list)           \
  96                 if (i=drhd->iommu, 0) {} else
  97
  98 static inline bool dmar_rcu_check(void)
  99 {
 100         return rwsem_is_locked(&dmar_global_lock) ||
 101                system_state == SYSTEM_BOOTING;
 102 }
 103
 104 #define dmar_rcu_dereference(p) rcu_dereference_check((p), dmar_rcu_check())
 105
 106 #define for_each_dev_scope(a, c, p, d)  \
 107         for ((p) = 0; ((d) = (p) < (c) ? dmar_rcu_dereference((a)[(p)].dev) : \
 108                         NULL, (p) < (c)); (p)++)
 109
 110 #define for_each_active_dev_scope(a, c, p, d)   \
 111         for_each_dev_scope((a), (c), (p), (d))  if (!(d)) { continue; } else
 112
 113 extern int dmar_table_init(void);
 114 extern int dmar_dev_scope_init(void);
 115 extern int dmar_parse_dev_scope(void *start, void *end, int *cnt,
 116                                 struct dmar_dev_scope **devices, u16 segment);
 117 extern void *dmar_alloc_dev_scope(void *start, void *end, int *cnt);
 118 extern void dmar_free_dev_scope(struct dmar_dev_scope **devices, int *cnt);
 119 extern int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
 120                                  void *start, void*end, u16 segment,
 121                                  struct dmar_dev_scope *devices,
 122                                  int devices_cnt);
 123 extern int dmar_remove_dev_scope(struct dmar_pci_notify_info *info,
 124                                  u16 segment, struct dmar_dev_scope *devices,
 125                                  int count);
 126 /* Intel IOMMU detection */
 127 extern int detect_intel_iommu(void);
 128 extern int enable_drhd_fault_handling(void);
 129 extern int dmar_device_add(acpi_handle handle);
 130 extern int dmar_device_remove(acpi_handle handle);
 131
 132 static inline int dmar_res_noop(struct acpi_dmar_header *hdr, void *arg)
 133 {
 134         return 0;
 135 }
 136
 137 #ifdef CONFIG_INTEL_IOMMU
 138 extern int iommu_detected, no_iommu;
 139 extern int intel_iommu_init(void);
 140 extern int dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg);
 141 extern int dmar_parse_one_atsr(struct acpi_dmar_header *header, void *arg);
 142 extern int dmar_check_one_atsr(struct acpi_dmar_header *hdr, void *arg);
 143 extern int dmar_release_one_atsr(struct acpi_dmar_header *hdr, void *arg);
 144 extern int dmar_iommu_hotplug(struct dmar_drhd_unit *dmaru, bool insert);
 145 extern int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info);
 146 #else /* !CONFIG_INTEL_IOMMU: */
 147 static inline int intel_iommu_init(void) { return -ENODEV; }
 148
 149 #define dmar_parse_one_rmrr             dmar_res_noop
 150 #define dmar_parse_one_atsr             dmar_res_noop
 151 #define dmar_check_one_atsr             dmar_res_noop
 152 #define dmar_release_one_atsr           dmar_res_noop
 153
 154 static inline int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
 155 {
 156         return 0;
 157 }
 158
 159 static inline int dmar_iommu_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
 160 {
 161         return 0;
 162 }
 163 #endif /* CONFIG_INTEL_IOMMU */
 164
 165 #ifdef CONFIG_IRQ_REMAP
 166 extern int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert);
 167 #else  /* CONFIG_IRQ_REMAP */
 168 static inline int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
 169 { return 0; }
 170 #endif /* CONFIG_IRQ_REMAP */
 171
 172 #else /* CONFIG_DMAR_TABLE */
 173
 174 static inline int dmar_device_add(void *handle)
 175 {
 176         return 0;
 177 }
 178
 179 static inline int dmar_device_remove(void *handle)
 180 {
 181         return 0;
 182 }
 183
 184 #endif /* CONFIG_DMAR_TABLE */
 185
 186 struct irte {
 187         union {
 188                 struct {
 189                         __u64   present         : 1,
 190                                 fpd             : 1,
 191                                 dst_mode        : 1,
 192                                 redir_hint      : 1,
 193                                 trigger_mode    : 1,
 194                                 dlvry_mode      : 3,
 195                                 avail           : 4,
 196                                 __reserved_1    : 4,
 197                                 vector          : 8,
 198                                 __reserved_2    : 8,
 199                                 dest_id         : 32;
 200                 };
 201                 __u64 low;
 202         };
 203
 204         union {
 205                 struct {
 206                         __u64   sid             : 16,
 207                                 sq              : 2,
 208                                 svt             : 2,
 209                                 __reserved_3    : 44;
 210                 };
 211                 __u64 high;
 212         };
 213 };
 214
 215 enum {
 216         IRQ_REMAP_XAPIC_MODE,
 217         IRQ_REMAP_X2APIC_MODE,
 218 };
 219
 220 /* Can't use the common MSI interrupt functions
 221  * since DMAR is not a pci device
 222  */
 223 struct irq_data;
 224 extern void dmar_msi_unmask(struct irq_data *data);
 225 extern void dmar_msi_mask(struct irq_data *data);
 226 extern void dmar_msi_read(int irq, struct msi_msg *msg);
 227 extern void dmar_msi_write(int irq, struct msi_msg *msg);
 228 extern int dmar_set_interrupt(struct intel_iommu *iommu);
 229 extern irqreturn_t dmar_fault(int irq, void *dev_id);
 230 extern int arch_setup_dmar_msi(unsigned int irq);
 231
 232 #endif /* __DMAR_H__ */