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
34 #ifndef _DEV_IOMMU_IOMMU_H_
35 #define _DEV_IOMMU_IOMMU_H_
37 #include <dev/iommu/iommu_types.h>
39 struct bus_dma_tag_common;
40 struct iommu_map_entry;
41 TAILQ_HEAD(iommu_map_entries_tailq, iommu_map_entry);
43 RB_HEAD(iommu_gas_entries_tree, iommu_map_entry);
44 RB_PROTOTYPE(iommu_gas_entries_tree, iommu_map_entry, rb_entry,
45 iommu_gas_cmp_entries);
47 struct iommu_qi_genseq {
52 struct iommu_map_entry {
55 iommu_gaddr_t first; /* Least start in subtree */
56 iommu_gaddr_t last; /* Greatest end in subtree */
57 iommu_gaddr_t free_down; /* Max free space below the
58 current R/B tree node */
60 TAILQ_ENTRY(iommu_map_entry) dmamap_link; /* Link for dmamap entries */
61 RB_ENTRY(iommu_map_entry) rb_entry; /* Links for domain entries */
62 TAILQ_ENTRY(iommu_map_entry) unroll_link; /* Link for unroll after
63 dmamap_load failure */
64 struct iommu_domain *domain;
65 struct iommu_qi_genseq gseq;
75 /* Busdma delayed map load */
76 struct task dmamap_load_task;
77 TAILQ_HEAD(, bus_dmamap_iommu) delayed_maps;
78 struct taskqueue *delayed_taskqueue;
81 * Bitmap of buses for which context must ignore slot:func,
82 * duplicating the page table pointer into all context table
83 * entries. This is a client-controlled quirk to support some
86 uint32_t buswide_ctxs[(PCI_BUSMAX + 1) / NBBY / sizeof(uint32_t)];
89 struct iommu_domain_map_ops {
90 int (*map)(struct iommu_domain *domain, iommu_gaddr_t base,
91 iommu_gaddr_t size, vm_page_t *ma, uint64_t pflags, int flags);
92 int (*unmap)(struct iommu_domain *domain, iommu_gaddr_t base,
93 iommu_gaddr_t size, int flags);
97 * Locking annotations:
98 * (u) - Protected by iommu unit lock
99 * (d) - Protected by domain lock
100 * (c) - Immutable after initialization
103 struct iommu_domain {
104 struct iommu_unit *iommu; /* (c) */
105 const struct iommu_domain_map_ops *ops;
106 struct mtx lock; /* (c) */
107 struct task unload_task; /* (c) */
108 u_int entries_cnt; /* (d) */
109 struct iommu_map_entries_tailq unload_entries; /* (d) Entries to
111 struct iommu_gas_entries_tree rb_root; /* (d) */
112 iommu_gaddr_t end; /* (c) Highest address + 1 in
114 struct iommu_map_entry *first_place, *last_place; /* (d) */
115 struct iommu_map_entry *msi_entry; /* (d) Arch-specific */
116 iommu_gaddr_t msi_base; /* (d) Arch-specific */
117 vm_paddr_t msi_phys; /* (d) Arch-specific */
118 u_int flags; /* (u) */
122 struct iommu_domain *domain; /* (c) */
123 struct bus_dma_tag_iommu *tag; /* (c) Root tag */
124 u_long loads; /* atomic updates, for stat only */
125 u_long unloads; /* same */
126 u_int flags; /* (u) */
127 uint16_t rid; /* (c) pci RID */
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 IOMMU_DOMAIN_GAS_INITED 0x0001
138 #define IOMMU_DOMAIN_PGTBL_INITED 0x0002
139 #define IOMMU_DOMAIN_IDMAP 0x0010 /* Domain uses identity
141 #define IOMMU_DOMAIN_RMRR 0x0020 /* Domain contains RMRR entry,
142 cannot be turned off */
144 #define IOMMU_LOCK(unit) mtx_lock(&(unit)->lock)
145 #define IOMMU_UNLOCK(unit) mtx_unlock(&(unit)->lock)
146 #define IOMMU_ASSERT_LOCKED(unit) mtx_assert(&(unit)->lock, MA_OWNED)
148 #define IOMMU_DOMAIN_LOCK(dom) mtx_lock(&(dom)->lock)
149 #define IOMMU_DOMAIN_UNLOCK(dom) mtx_unlock(&(dom)->lock)
150 #define IOMMU_DOMAIN_ASSERT_LOCKED(dom) mtx_assert(&(dom)->lock, MA_OWNED)
153 iommu_test_boundary(iommu_gaddr_t start, iommu_gaddr_t size,
154 iommu_gaddr_t boundary)
159 return (start + size <= ((start + boundary) & ~(boundary - 1)));
162 void iommu_free_ctx(struct iommu_ctx *ctx);
163 void iommu_free_ctx_locked(struct iommu_unit *iommu, struct iommu_ctx *ctx);
164 struct iommu_ctx *iommu_get_ctx(struct iommu_unit *, device_t dev,
165 uint16_t rid, bool id_mapped, bool rmrr_init);
166 struct iommu_unit *iommu_find(device_t dev, bool verbose);
167 void iommu_domain_unload_entry(struct iommu_map_entry *entry, bool free);
168 void iommu_domain_unload(struct iommu_domain *domain,
169 struct iommu_map_entries_tailq *entries, bool cansleep);
171 struct iommu_ctx *iommu_instantiate_ctx(struct iommu_unit *iommu,
172 device_t dev, bool rmrr);
173 device_t iommu_get_requester(device_t dev, uint16_t *rid);
174 int iommu_init_busdma(struct iommu_unit *unit);
175 void iommu_fini_busdma(struct iommu_unit *unit);
176 struct iommu_map_entry *iommu_map_alloc_entry(struct iommu_domain *iodom,
178 void iommu_map_free_entry(struct iommu_domain *, struct iommu_map_entry *);
179 int iommu_map(struct iommu_domain *iodom,
180 const struct bus_dma_tag_common *common, iommu_gaddr_t size, int offset,
181 u_int eflags, u_int flags, vm_page_t *ma, struct iommu_map_entry **res);
182 int iommu_map_region(struct iommu_domain *domain,
183 struct iommu_map_entry *entry, u_int eflags, u_int flags, vm_page_t *ma);
185 void iommu_gas_init_domain(struct iommu_domain *domain);
186 void iommu_gas_fini_domain(struct iommu_domain *domain);
187 struct iommu_map_entry *iommu_gas_alloc_entry(struct iommu_domain *domain,
189 void iommu_gas_free_entry(struct iommu_domain *domain,
190 struct iommu_map_entry *entry);
191 void iommu_gas_free_space(struct iommu_domain *domain,
192 struct iommu_map_entry *entry);
193 int iommu_gas_map(struct iommu_domain *domain,
194 const struct bus_dma_tag_common *common, iommu_gaddr_t size, int offset,
195 u_int eflags, u_int flags, vm_page_t *ma, struct iommu_map_entry **res);
196 void iommu_gas_free_region(struct iommu_domain *domain,
197 struct iommu_map_entry *entry);
198 int iommu_gas_map_region(struct iommu_domain *domain,
199 struct iommu_map_entry *entry, u_int eflags, u_int flags, vm_page_t *ma);
200 int iommu_gas_reserve_region(struct iommu_domain *domain, iommu_gaddr_t start,
201 iommu_gaddr_t end, struct iommu_map_entry **entry0);
202 int iommu_gas_reserve_region_extend(struct iommu_domain *domain,
203 iommu_gaddr_t start, iommu_gaddr_t end);
205 void iommu_set_buswide_ctx(struct iommu_unit *unit, u_int busno);
206 bool iommu_is_buswide_ctx(struct iommu_unit *unit, u_int busno);
207 void iommu_domain_init(struct iommu_unit *unit, struct iommu_domain *domain,
208 const struct iommu_domain_map_ops *ops);
209 void iommu_domain_fini(struct iommu_domain *domain);
211 bool bus_dma_iommu_set_buswide(device_t dev);
212 int bus_dma_iommu_load_ident(bus_dma_tag_t dmat, bus_dmamap_t map,
213 vm_paddr_t start, vm_size_t length, int flags);
215 bus_dma_tag_t iommu_get_dma_tag(device_t dev, device_t child);
216 struct iommu_ctx *iommu_get_dev_ctx(device_t dev);
217 struct iommu_domain *iommu_get_ctx_domain(struct iommu_ctx *ctx);
219 SYSCTL_DECL(_hw_iommu);
221 #endif /* !_DEV_IOMMU_IOMMU_H_ */