aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/linux-headers/linux/iommu.h
blob: 872f7860a0f2ccfa86beaef0c67fef0d0d64eb65 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * IOMMU user API definitions
 */

#ifndef _IOMMU_H
#define _IOMMU_H

#include <linux/types.h>

#define IOMMU_FAULT_PERM_READ	(1 << 0) /* read */
#define IOMMU_FAULT_PERM_WRITE	(1 << 1) /* write */
#define IOMMU_FAULT_PERM_EXEC	(1 << 2) /* exec */
#define IOMMU_FAULT_PERM_PRIV	(1 << 3) /* privileged */

/* Generic fault types, can be expanded IRQ remapping fault */
enum iommu_fault_type {
	IOMMU_FAULT_DMA_UNRECOV = 1,	/* unrecoverable fault */
	IOMMU_FAULT_PAGE_REQ,		/* page request fault */
};

enum iommu_fault_reason {
	IOMMU_FAULT_REASON_UNKNOWN = 0,

	/* Could not access the PASID table (fetch caused external abort) */
	IOMMU_FAULT_REASON_PASID_FETCH,

	/* PASID entry is invalid or has configuration errors */
	IOMMU_FAULT_REASON_BAD_PASID_ENTRY,

	/*
	 * PASID is out of range (e.g. exceeds the maximum PASID
	 * supported by the IOMMU) or disabled.
	 */
	IOMMU_FAULT_REASON_PASID_INVALID,

	/*
	 * An external abort occurred fetching (or updating) a translation
	 * table descriptor
	 */
	IOMMU_FAULT_REASON_WALK_EABT,

	/*
	 * Could not access the page table entry (Bad address),
	 * actual translation fault
	 */
	IOMMU_FAULT_REASON_PTE_FETCH,

	/* Protection flag check failed */
	IOMMU_FAULT_REASON_PERMISSION,

	/* access flag check failed */
	IOMMU_FAULT_REASON_ACCESS,

	/* Output address of a translation stage caused Address Size fault */
	IOMMU_FAULT_REASON_OOR_ADDRESS,
};

/**
 * struct iommu_fault_unrecoverable - Unrecoverable fault data
 * @reason: reason of the fault, from &enum iommu_fault_reason
 * @flags: parameters of this fault (IOMMU_FAULT_UNRECOV_* values)
 * @pasid: Process Address Space ID
 * @perm: requested permission access using by the incoming transaction
 *        (IOMMU_FAULT_PERM_* values)
 * @addr: offending page address
 * @fetch_addr: address that caused a fetch abort, if any
 */
struct iommu_fault_unrecoverable {
	__u32	reason;
#define IOMMU_FAULT_UNRECOV_PASID_VALID		(1 << 0)
#define IOMMU_FAULT_UNRECOV_ADDR_VALID		(1 << 1)
#define IOMMU_FAULT_UNRECOV_FETCH_ADDR_VALID	(1 << 2)
	__u32	flags;
	__u32	pasid;
	__u32	perm;
	__u64	addr;
	__u64	fetch_addr;
};

/**
 * struct iommu_fault_page_request - Page Request data
 * @flags: encodes whether the corresponding fields are valid and whether this
 *         is the last page in group (IOMMU_FAULT_PAGE_REQUEST_* values)
 * @pasid: Process Address Space ID
 * @grpid: Page Request Group Index
 * @perm: requested page permissions (IOMMU_FAULT_PERM_* values)
 * @addr: page address
 * @private_data: device-specific private information
 */
struct iommu_fault_page_request {
#define IOMMU_FAULT_PAGE_REQUEST_PASID_VALID	(1 << 0)
#define IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE	(1 << 1)
#define IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA	(1 << 2)
	__u32	flags;
	__u32	pasid;
	__u32	grpid;
	__u32	perm;
	__u64	addr;
	__u64	private_data[2];
};

/**
 * struct iommu_fault - Generic fault data
 * @type: fault type from &enum iommu_fault_type
 * @padding: reserved for future use (should be zero)
 * @event: fault event, when @type is %IOMMU_FAULT_DMA_UNRECOV
 * @prm: Page Request message, when @type is %IOMMU_FAULT_PAGE_REQ
 * @padding2: sets the fault size to allow for future extensions
 */
struct iommu_fault {
	__u32	type;
	__u32	padding;
	union {
		struct iommu_fault_unrecoverable event;
		struct iommu_fault_page_request prm;
		__u8 padding2[56];
	};
};

/**
 * enum iommu_page_response_code - Return status of fault handlers
 * @IOMMU_PAGE_RESP_SUCCESS: Fault has been handled and the page tables
 *	populated, retry the access. This is "Success" in PCI PRI.
 * @IOMMU_PAGE_RESP_FAILURE: General error. Drop all subsequent faults from
 *	this device if possible. This is "Response Failure" in PCI PRI.
 * @IOMMU_PAGE_RESP_INVALID: Could not handle this fault, don't retry the
 *	access. This is "Invalid Request" in PCI PRI.
 */
enum iommu_page_response_code {
	IOMMU_PAGE_RESP_SUCCESS = 0,
	IOMMU_PAGE_RESP_INVALID,
	IOMMU_PAGE_RESP_FAILURE,
};

/**
 * struct iommu_page_response - Generic page response information
 * @version: API version of this structure
 * @flags: encodes whether the corresponding fields are valid
 *         (IOMMU_FAULT_PAGE_RESPONSE_* values)
 * @pasid: Process Address Space ID
 * @grpid: Page Request Group Index
 * @code: response code from &enum iommu_page_response_code
 */
struct iommu_page_response {
#define IOMMU_PAGE_RESP_VERSION_1	1
	__u32	version;
#define IOMMU_PAGE_RESP_PASID_VALID	(1 << 0)
	__u32	flags;
	__u32	pasid;
	__u32	grpid;
	__u32	code;
};

/* defines the granularity of the invalidation */
enum iommu_inv_granularity {
	IOMMU_INV_GRANU_DOMAIN,	/* domain-selective invalidation */
	IOMMU_INV_GRANU_PASID,	/* PASID-selective invalidation */
	IOMMU_INV_GRANU_ADDR,	/* page-selective invalidation */
	IOMMU_INV_GRANU_NR,	/* number of invalidation granularities */
};

/**
 * struct iommu_inv_addr_info - Address Selective Invalidation Structure
 *
 * @flags: indicates the granularity of the address-selective invalidation
 * - If the PASID bit is set, the @pasid field is populated and the invalidation
 *   relates to cache entries tagged with this PASID and matching the address
 *   range.
 * - If ARCHID bit is set, @archid is populated and the invalidation relates
 *   to cache entries tagged with this architecture specific ID and matching
 *   the address range.
 * - Both PASID and ARCHID can be set as they may tag different caches.
 * - If neither PASID or ARCHID is set, global addr invalidation applies.
 * - The LEAF flag indicates whether only the leaf PTE caching needs to be
 *   invalidated and other paging structure caches can be preserved.
 * @pasid: process address space ID
 * @archid: architecture-specific ID
 * @addr: first stage/level input address
 * @granule_size: page/block size of the mapping in bytes
 * @nb_granules: number of contiguous granules to be invalidated
 */
struct iommu_inv_addr_info {
#define IOMMU_INV_ADDR_FLAGS_PASID	(1 << 0)
#define IOMMU_INV_ADDR_FLAGS_ARCHID	(1 << 1)
#define IOMMU_INV_ADDR_FLAGS_LEAF	(1 << 2)
	__u32	flags;
	__u32	archid;
	__u64	pasid;
	__u64	addr;
	__u64	granule_size;
	__u64	nb_granules;
};

/**
 * struct iommu_inv_pasid_info - PASID Selective Invalidation Structure
 *
 * @flags: indicates the granularity of the PASID-selective invalidation
 * - If the PASID bit is set, the @pasid field is populated and the invalidation
 *   relates to cache entries tagged with this PASID and matching the address
 *   range.
 * - If the ARCHID bit is set, the @archid is populated and the invalidation
 *   relates to cache entries tagged with this architecture specific ID and
 *   matching the address range.
 * - Both PASID and ARCHID can be set as they may tag different caches.
 * - At least one of PASID or ARCHID must be set.
 * @pasid: process address space ID
 * @archid: architecture-specific ID
 */
struct iommu_inv_pasid_info {
#define IOMMU_INV_PASID_FLAGS_PASID	(1 << 0)
#define IOMMU_INV_PASID_FLAGS_ARCHID	(1 << 1)
	__u32	flags;
	__u32	archid;
	__u64	pasid;
};

/**
 * struct iommu_cache_invalidate_info - First level/stage invalidation
 *     information
 * @version: API version of this structure
 * @cache: bitfield that allows to select which caches to invalidate
 * @granularity: defines the lowest granularity used for the invalidation:
 *     domain > PASID > addr
 * @padding: reserved for future use (should be zero)
 * @pasid_info: invalidation data when @granularity is %IOMMU_INV_GRANU_PASID
 * @addr_info: invalidation data when @granularity is %IOMMU_INV_GRANU_ADDR
 *
 * Not all the combinations of cache/granularity are valid:
 *
 * +--------------+---------------+---------------+---------------+
 * | type /       |   DEV_IOTLB   |     IOTLB     |      PASID    |
 * | granularity  |               |               |      cache    |
 * +==============+===============+===============+===============+
 * | DOMAIN       |       N/A     |       Y       |       Y       |
 * +--------------+---------------+---------------+---------------+
 * | PASID        |       Y       |       Y       |       Y       |
 * +--------------+---------------+---------------+---------------+
 * | ADDR         |       Y       |       Y       |       N/A     |
 * +--------------+---------------+---------------+---------------+
 *
 * Invalidations by %IOMMU_INV_GRANU_DOMAIN don't take any argument other than
 * @version and @cache.
 *
 * If multiple cache types are invalidated simultaneously, they all
 * must support the used granularity.
 */
struct iommu_cache_invalidate_info {
#define IOMMU_CACHE_INVALIDATE_INFO_VERSION_1 1
	__u32	version;
/* IOMMU paging structure cache */
#define IOMMU_CACHE_INV_TYPE_IOTLB	(1 << 0) /* IOMMU IOTLB */
#define IOMMU_CACHE_INV_TYPE_DEV_IOTLB	(1 << 1) /* Device IOTLB */
#define IOMMU_CACHE_INV_TYPE_PASID	(1 << 2) /* PASID cache */
#define IOMMU_CACHE_INV_TYPE_NR		(3)
	__u8	cache;
	__u8	granularity;
	__u8	padding[2];
	union {
		struct iommu_inv_pasid_info pasid_info;
		struct iommu_inv_addr_info addr_info;
	};
};

/**
 * struct iommu_gpasid_bind_data_vtd - Intel VT-d specific data on device and guest
 * SVA binding.
 *
 * @flags:	VT-d PASID table entry attributes
 * @pat:	Page attribute table data to compute effective memory type
 * @emt:	Extended memory type
 *
 * Only guest vIOMMU selectable and effective options are passed down to
 * the host IOMMU.
 */
struct iommu_gpasid_bind_data_vtd {
#define IOMMU_SVA_VTD_GPASID_SRE	(1 << 0) /* supervisor request */
#define IOMMU_SVA_VTD_GPASID_EAFE	(1 << 1) /* extended access enable */
#define IOMMU_SVA_VTD_GPASID_PCD	(1 << 2) /* page-level cache disable */
#define IOMMU_SVA_VTD_GPASID_PWT	(1 << 3) /* page-level write through */
#define IOMMU_SVA_VTD_GPASID_EMTE	(1 << 4) /* extended mem type enable */
#define IOMMU_SVA_VTD_GPASID_CD		(1 << 5) /* PASID-level cache disable */
	__u64 flags;
	__u32 pat;
	__u32 emt;
};

/**
 * struct iommu_gpasid_bind_data - Information about device and guest PASID binding
 * @version:	Version of this data structure
 * @format:	PASID table entry format
 * @flags:	Additional information on guest bind request
 * @gpgd:	Guest page directory base of the guest mm to bind
 * @hpasid:	Process address space ID used for the guest mm in host IOMMU
 * @gpasid:	Process address space ID used for the guest mm in guest IOMMU
 * @addr_width:	Guest virtual address width
 * @padding:	Reserved for future use (should be zero)
 * @vtd:	Intel VT-d specific data
 *
 * Guest to host PASID mapping can be an identity or non-identity, where guest
 * has its own PASID space. For non-identify mapping, guest to host PASID lookup
 * is needed when VM programs guest PASID into an assigned device. VMM may
 * trap such PASID programming then request host IOMMU driver to convert guest
 * PASID to host PASID based on this bind data.
 */
struct iommu_gpasid_bind_data {
#define IOMMU_GPASID_BIND_VERSION_1	1
	__u32 version;
#define IOMMU_PASID_FORMAT_INTEL_VTD	1
	__u32 format;
#define IOMMU_SVA_GPASID_VAL	(1 << 0) /* guest PASID valid */
	__u64 flags;
	__u64 gpgd;
	__u64 hpasid;
	__u64 gpasid;
	__u32 addr_width;
	__u8  padding[12];
	/* Vendor specific data */
	union {
		struct iommu_gpasid_bind_data_vtd vtd;
	};
};

#endif /* _IOMMU_H */