1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2013 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #ifndef _SYS_IOMMU_H_ 35 #define _SYS_IOMMU_H_ 36 37 /* Host or physical memory address, after translation. */ 38 typedef uint64_t iommu_haddr_t; 39 /* Guest or bus address, before translation. */ 40 typedef uint64_t iommu_gaddr_t; 41 42 struct bus_dma_tag_common; 43 struct iommu_map_entry; 44 TAILQ_HEAD(iommu_map_entries_tailq, iommu_map_entry); 45 46 RB_HEAD(iommu_gas_entries_tree, iommu_map_entry); 47 RB_PROTOTYPE(iommu_gas_entries_tree, iommu_map_entry, rb_entry, 48 iommu_gas_cmp_entries); 49 50 struct iommu_qi_genseq { 51 u_int gen; 52 uint32_t seq; 53 }; 54 55 struct iommu_map_entry { 56 iommu_gaddr_t start; 57 iommu_gaddr_t end; 58 iommu_gaddr_t first; /* Least start in subtree */ 59 iommu_gaddr_t last; /* Greatest end in subtree */ 60 iommu_gaddr_t free_down; /* Max free space below the 61 current R/B tree node */ 62 u_int flags; 63 TAILQ_ENTRY(iommu_map_entry) dmamap_link; /* Link for dmamap entries */ 64 RB_ENTRY(iommu_map_entry) rb_entry; /* Links for domain entries */ 65 TAILQ_ENTRY(iommu_map_entry) unroll_link; /* Link for unroll after 66 dmamap_load failure */ 67 struct iommu_domain *domain; 68 struct iommu_qi_genseq gseq; 69 }; 70 71 #define IOMMU_MAP_ENTRY_PLACE 0x0001 /* Fake entry */ 72 #define IOMMU_MAP_ENTRY_RMRR 0x0002 /* Permanent, not linked by 73 dmamap_link */ 74 #define IOMMU_MAP_ENTRY_MAP 0x0004 /* Busdma created, linked by 75 dmamap_link */ 76 #define IOMMU_MAP_ENTRY_UNMAPPED 0x0010 /* No backing pages */ 77 #define IOMMU_MAP_ENTRY_QI_NF 0x0020 /* qi task, do not free entry */ 78 #define IOMMU_MAP_ENTRY_READ 0x1000 /* Read permitted */ 79 #define IOMMU_MAP_ENTRY_WRITE 0x2000 /* Write permitted */ 80 #define IOMMU_MAP_ENTRY_SNOOP 0x4000 /* Snoop */ 81 #define IOMMU_MAP_ENTRY_TM 0x8000 /* Transient */ 82 83 struct iommu_unit { 84 struct mtx lock; 85 int unit; 86 87 int dma_enabled; 88 89 /* Busdma delayed map load */ 90 struct task dmamap_load_task; 91 TAILQ_HEAD(, bus_dmamap_iommu) delayed_maps; 92 struct taskqueue *delayed_taskqueue; 93 94 /* 95 * Bitmap of buses for which context must ignore slot:func, 96 * duplicating the page table pointer into all context table 97 * entries. This is a client-controlled quirk to support some 98 * NTBs. 99 */ 100 uint32_t buswide_ctxs[(PCI_BUSMAX + 1) / NBBY / sizeof(uint32_t)]; 101 }; 102 103 /* 104 * Locking annotations: 105 * (u) - Protected by iommu unit lock 106 * (d) - Protected by domain lock 107 * (c) - Immutable after initialization 108 */ 109 110 struct iommu_domain { 111 struct iommu_unit *iommu; /* (c) */ 112 struct mtx lock; /* (c) */ 113 struct task unload_task; /* (c) */ 114 u_int entries_cnt; /* (d) */ 115 struct iommu_map_entries_tailq unload_entries; /* (d) Entries to 116 unload */ 117 struct iommu_gas_entries_tree rb_root; /* (d) */ 118 iommu_gaddr_t end; /* (c) Highest address + 1 in 119 the guest AS */ 120 struct iommu_map_entry *first_place, *last_place; /* (d) */ 121 u_int flags; /* (u) */ 122 }; 123 124 struct iommu_ctx { 125 struct iommu_domain *domain; /* (c) */ 126 struct bus_dma_tag_iommu *tag; /* (c) Root tag */ 127 u_long loads; /* atomic updates, for stat only */ 128 u_long unloads; /* same */ 129 u_int flags; /* (u) */ 130 }; 131 132 /* struct iommu_ctx flags */ 133 #define IOMMU_CTX_FAULTED 0x0001 /* Fault was reported, 134 last_fault_rec is valid */ 135 #define IOMMU_CTX_DISABLED 0x0002 /* Device is disabled, the 136 ephemeral reference is kept 137 to prevent context destruction */ 138 139 #define IOMMU_DOMAIN_GAS_INITED 0x0001 140 #define IOMMU_DOMAIN_PGTBL_INITED 0x0002 141 #define IOMMU_DOMAIN_IDMAP 0x0010 /* Domain uses identity 142 page table */ 143 #define IOMMU_DOMAIN_RMRR 0x0020 /* Domain contains RMRR entry, 144 cannot be turned off */ 145 146 /* Map flags */ 147 #define IOMMU_MF_CANWAIT 0x0001 148 #define IOMMU_MF_CANSPLIT 0x0002 149 #define IOMMU_MF_RMRR 0x0004 150 151 #define IOMMU_PGF_WAITOK 0x0001 152 #define IOMMU_PGF_ZERO 0x0002 153 #define IOMMU_PGF_ALLOC 0x0004 154 #define IOMMU_PGF_NOALLOC 0x0008 155 #define IOMMU_PGF_OBJL 0x0010 156 157 #define IOMMU_LOCK(unit) mtx_lock(&(unit)->lock) 158 #define IOMMU_UNLOCK(unit) mtx_unlock(&(unit)->lock) 159 #define IOMMU_ASSERT_LOCKED(unit) mtx_assert(&(unit)->lock, MA_OWNED) 160 161 #define IOMMU_DOMAIN_LOCK(dom) mtx_lock(&(dom)->lock) 162 #define IOMMU_DOMAIN_UNLOCK(dom) mtx_unlock(&(dom)->lock) 163 #define IOMMU_DOMAIN_ASSERT_LOCKED(dom) mtx_assert(&(dom)->lock, MA_OWNED) 164 165 static inline bool 166 iommu_test_boundary(iommu_gaddr_t start, iommu_gaddr_t size, 167 iommu_gaddr_t boundary) 168 { 169 170 if (boundary == 0) 171 return (true); 172 return (start + size <= ((start + boundary) & ~(boundary - 1))); 173 } 174 175 void iommu_free_ctx(struct iommu_ctx *ctx); 176 void iommu_free_ctx_locked(struct iommu_unit *iommu, struct iommu_ctx *ctx); 177 struct iommu_ctx *iommu_get_ctx(struct iommu_unit *, device_t dev, 178 uint16_t rid, bool id_mapped, bool rmrr_init); 179 struct iommu_unit *iommu_find(device_t dev, bool verbose); 180 void iommu_domain_unload_entry(struct iommu_map_entry *entry, bool free); 181 void iommu_domain_unload(struct iommu_domain *domain, 182 struct iommu_map_entries_tailq *entries, bool cansleep); 183 184 struct iommu_ctx *iommu_instantiate_ctx(struct iommu_unit *iommu, 185 device_t dev, bool rmrr); 186 device_t iommu_get_requester(device_t dev, uint16_t *rid); 187 int iommu_init_busdma(struct iommu_unit *unit); 188 void iommu_fini_busdma(struct iommu_unit *unit); 189 struct iommu_map_entry *iommu_map_alloc_entry(struct iommu_domain *iodom, 190 u_int flags); 191 void iommu_map_free_entry(struct iommu_domain *, struct iommu_map_entry *); 192 int iommu_map(struct iommu_domain *iodom, 193 const struct bus_dma_tag_common *common, iommu_gaddr_t size, int offset, 194 u_int eflags, u_int flags, vm_page_t *ma, struct iommu_map_entry **res); 195 int iommu_map_region(struct iommu_domain *domain, 196 struct iommu_map_entry *entry, u_int eflags, u_int flags, vm_page_t *ma); 197 198 void iommu_gas_init_domain(struct iommu_domain *domain); 199 void iommu_gas_fini_domain(struct iommu_domain *domain); 200 struct iommu_map_entry *iommu_gas_alloc_entry(struct iommu_domain *domain, 201 u_int flags); 202 void iommu_gas_free_entry(struct iommu_domain *domain, 203 struct iommu_map_entry *entry); 204 void iommu_gas_free_space(struct iommu_domain *domain, 205 struct iommu_map_entry *entry); 206 int iommu_gas_map(struct iommu_domain *domain, 207 const struct bus_dma_tag_common *common, iommu_gaddr_t size, int offset, 208 u_int eflags, u_int flags, vm_page_t *ma, struct iommu_map_entry **res); 209 void iommu_gas_free_region(struct iommu_domain *domain, 210 struct iommu_map_entry *entry); 211 int iommu_gas_map_region(struct iommu_domain *domain, 212 struct iommu_map_entry *entry, u_int eflags, u_int flags, vm_page_t *ma); 213 int iommu_gas_reserve_region(struct iommu_domain *domain, iommu_gaddr_t start, 214 iommu_gaddr_t end); 215 216 void iommu_set_buswide_ctx(struct iommu_unit *unit, u_int busno); 217 bool iommu_is_buswide_ctx(struct iommu_unit *unit, u_int busno); 218 219 bool bus_dma_iommu_set_buswide(device_t dev); 220 int bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map, 221 vm_paddr_t start, vm_size_t length, int flags); 222 223 SYSCTL_DECL(_hw_iommu); 224 225 #endif /* !_SYS_IOMMU_H_ */ 226