2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2013 The FreeBSD Foundation
7 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
8 * under sponsorship from the FreeBSD Foundation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
37 #include <sys/queue.h>
38 #include <sys/sysctl.h>
39 #include <sys/taskqueue.h>
41 #include <sys/types.h>
43 /* Host or physical memory address, after translation. */
44 typedef uint64_t iommu_haddr_t;
45 /* Guest or bus address, before translation. */
46 typedef uint64_t iommu_gaddr_t;
48 struct bus_dma_tag_common;
49 struct iommu_map_entry;
50 TAILQ_HEAD(iommu_map_entries_tailq, iommu_map_entry);
52 RB_HEAD(iommu_gas_entries_tree, iommu_map_entry);
53 RB_PROTOTYPE(iommu_gas_entries_tree, iommu_map_entry, rb_entry,
54 iommu_gas_cmp_entries);
56 struct iommu_qi_genseq {
61 struct iommu_map_entry {
64 iommu_gaddr_t first; /* Least start in subtree */
65 iommu_gaddr_t last; /* Greatest end in subtree */
66 iommu_gaddr_t free_down; /* Max free space below the
67 current R/B tree node */
69 TAILQ_ENTRY(iommu_map_entry) dmamap_link; /* Link for dmamap entries */
70 RB_ENTRY(iommu_map_entry) rb_entry; /* Links for domain entries */
71 TAILQ_ENTRY(iommu_map_entry) unroll_link; /* Link for unroll after
72 dmamap_load failure */
73 struct iommu_domain *domain;
74 struct iommu_qi_genseq gseq;
77 #define IOMMU_MAP_ENTRY_PLACE 0x0001 /* Fake entry */
78 #define IOMMU_MAP_ENTRY_RMRR 0x0002 /* Permanent, not linked by
80 #define IOMMU_MAP_ENTRY_MAP 0x0004 /* Busdma created, linked by
82 #define IOMMU_MAP_ENTRY_UNMAPPED 0x0010 /* No backing pages */
83 #define IOMMU_MAP_ENTRY_QI_NF 0x0020 /* qi task, do not free entry */
84 #define IOMMU_MAP_ENTRY_READ 0x1000 /* Read permitted */
85 #define IOMMU_MAP_ENTRY_WRITE 0x2000 /* Write permitted */
86 #define IOMMU_MAP_ENTRY_SNOOP 0x4000 /* Snoop */
87 #define IOMMU_MAP_ENTRY_TM 0x8000 /* Transient */
95 /* Busdma delayed map load */
96 struct task dmamap_load_task;
97 TAILQ_HEAD(, bus_dmamap_iommu) delayed_maps;
98 struct taskqueue *delayed_taskqueue;
102 * Locking annotations:
103 * (u) - Protected by iommu unit lock
104 * (d) - Protected by domain lock
105 * (c) - Immutable after initialization
108 struct iommu_domain {
109 struct iommu_unit *iommu; /* (c) */
110 struct mtx lock; /* (c) */
111 struct task unload_task; /* (c) */
112 u_int entries_cnt; /* (d) */
113 struct iommu_map_entries_tailq unload_entries; /* (d) Entries to
115 struct iommu_gas_entries_tree rb_root; /* (d) */
116 iommu_gaddr_t end; /* (c) Highest address + 1 in
118 struct iommu_map_entry *first_place, *last_place; /* (d) */
119 u_int flags; /* (u) */
123 struct iommu_domain *domain; /* (c) */
124 struct bus_dma_tag_iommu *tag; /* (c) Root tag */
125 u_long loads; /* atomic updates, for stat only */
126 u_long unloads; /* same */
127 u_int flags; /* (u) */
130 /* struct iommu_ctx flags */
131 #define IOMMU_CTX_FAULTED 0x0001 /* Fault was reported,
132 last_fault_rec is valid */
133 #define IOMMU_CTX_DISABLED 0x0002 /* Device is disabled, the
134 ephemeral reference is kept
135 to prevent context destruction */
137 #define DMAR_DOMAIN_GAS_INITED 0x0001
138 #define DMAR_DOMAIN_PGTBL_INITED 0x0002
139 #define DMAR_DOMAIN_IDMAP 0x0010 /* Domain uses identity
141 #define DMAR_DOMAIN_RMRR 0x0020 /* Domain contains RMRR entry,
142 cannot be turned off */
145 #define IOMMU_MF_CANWAIT 0x0001
146 #define IOMMU_MF_CANSPLIT 0x0002
147 #define IOMMU_MF_RMRR 0x0004
149 #define DMAR_PGF_WAITOK 0x0001
150 #define DMAR_PGF_ZERO 0x0002
151 #define DMAR_PGF_ALLOC 0x0004
152 #define DMAR_PGF_NOALLOC 0x0008
153 #define DMAR_PGF_OBJL 0x0010
155 #define IOMMU_LOCK(unit) mtx_lock(&(unit)->lock)
156 #define IOMMU_UNLOCK(unit) mtx_unlock(&(unit)->lock)
157 #define IOMMU_ASSERT_LOCKED(unit) mtx_assert(&(unit)->lock, MA_OWNED)
159 #define IOMMU_DOMAIN_LOCK(dom) mtx_lock(&(dom)->lock)
160 #define IOMMU_DOMAIN_UNLOCK(dom) mtx_unlock(&(dom)->lock)
161 #define IOMMU_DOMAIN_ASSERT_LOCKED(dom) mtx_assert(&(dom)->lock, MA_OWNED)
164 iommu_test_boundary(iommu_gaddr_t start, iommu_gaddr_t size,
165 iommu_gaddr_t boundary)
170 return (start + size <= ((start + boundary) & ~(boundary - 1)));
173 void iommu_free_ctx(struct iommu_ctx *ctx);
174 void iommu_free_ctx_locked(struct iommu_unit *iommu, struct iommu_ctx *ctx);
175 struct iommu_ctx *iommu_get_ctx(struct iommu_unit *, device_t dev,
176 uint16_t rid, bool id_mapped, bool rmrr_init);
177 struct iommu_unit *iommu_find(device_t dev, bool verbose);
178 void iommu_domain_unload_entry(struct iommu_map_entry *entry, bool free);
179 void iommu_domain_unload(struct iommu_domain *domain,
180 struct iommu_map_entries_tailq *entries, bool cansleep);
182 struct iommu_ctx *iommu_instantiate_ctx(struct iommu_unit *iommu,
183 device_t dev, bool rmrr);
184 device_t iommu_get_requester(device_t dev, uint16_t *rid);
185 int iommu_init_busdma(struct iommu_unit *unit);
186 void iommu_fini_busdma(struct iommu_unit *unit);
187 struct iommu_map_entry *iommu_map_alloc_entry(struct iommu_domain *iodom,
189 void iommu_map_free_entry(struct iommu_domain *, struct iommu_map_entry *);
190 int iommu_map(struct iommu_domain *iodom,
191 const struct bus_dma_tag_common *common, iommu_gaddr_t size, int offset,
192 u_int eflags, u_int flags, vm_page_t *ma, struct iommu_map_entry **res);
193 int iommu_map_region(struct iommu_domain *domain,
194 struct iommu_map_entry *entry, u_int eflags, u_int flags, vm_page_t *ma);
196 void iommu_gas_init_domain(struct iommu_domain *domain);
197 void iommu_gas_fini_domain(struct iommu_domain *domain);
198 struct iommu_map_entry *iommu_gas_alloc_entry(struct iommu_domain *domain,
200 void iommu_gas_free_entry(struct iommu_domain *domain,
201 struct iommu_map_entry *entry);
202 void iommu_gas_free_space(struct iommu_domain *domain,
203 struct iommu_map_entry *entry);
204 int iommu_gas_map(struct iommu_domain *domain,
205 const struct bus_dma_tag_common *common, iommu_gaddr_t size, int offset,
206 u_int eflags, u_int flags, vm_page_t *ma, struct iommu_map_entry **res);
207 void iommu_gas_free_region(struct iommu_domain *domain,
208 struct iommu_map_entry *entry);
209 int iommu_gas_map_region(struct iommu_domain *domain,
210 struct iommu_map_entry *entry, u_int eflags, u_int flags, vm_page_t *ma);
211 int iommu_gas_reserve_region(struct iommu_domain *domain, iommu_gaddr_t start,
214 SYSCTL_DECL(_hw_iommu);
216 #endif /* !_SYS_IOMMU_H_ */