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1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
2 | /* | |
3 | * This is a module to test the HMM (Heterogeneous Memory Management) API | |
4 | * of the kernel. It allows a userspace program to expose its entire address | |
5 | * space through the HMM test module device file. | |
6 | */ | |
7 | #ifndef _LIB_TEST_HMM_UAPI_H | |
8 | #define _LIB_TEST_HMM_UAPI_H | |
9 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/ioctl.h> | |
12 | ||
13 | /* | |
14 | * Structure to pass to the HMM test driver to mimic a device accessing | |
15 | * system memory and ZONE_DEVICE private memory through device page tables. | |
16 | * | |
17 | * @addr: (in) user address the device will read/write | |
18 | * @ptr: (in) user address where device data is copied to/from | |
19 | * @npages: (in) number of pages to read/write | |
20 | * @cpages: (out) number of pages copied | |
21 | * @faults: (out) number of device page faults seen | |
22 | */ | |
23 | struct hmm_dmirror_cmd { | |
24 | __u64 addr; | |
25 | __u64 ptr; | |
26 | __u64 npages; | |
27 | __u64 cpages; | |
28 | __u64 faults; | |
29 | }; | |
30 | ||
31 | /* Expose the address space of the calling process through hmm device file */ | |
32 | #define HMM_DMIRROR_READ _IOWR('H', 0x00, struct hmm_dmirror_cmd) | |
33 | #define HMM_DMIRROR_WRITE _IOWR('H', 0x01, struct hmm_dmirror_cmd) | |
34 | #define HMM_DMIRROR_MIGRATE _IOWR('H', 0x02, struct hmm_dmirror_cmd) | |
35 | #define HMM_DMIRROR_SNAPSHOT _IOWR('H', 0x03, struct hmm_dmirror_cmd) | |
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36 | #define HMM_DMIRROR_EXCLUSIVE _IOWR('H', 0x04, struct hmm_dmirror_cmd) |
37 | #define HMM_DMIRROR_CHECK_EXCLUSIVE _IOWR('H', 0x05, struct hmm_dmirror_cmd) | |
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38 | |
39 | /* | |
40 | * Values returned in hmm_dmirror_cmd.ptr for HMM_DMIRROR_SNAPSHOT. | |
41 | * HMM_DMIRROR_PROT_ERROR: no valid mirror PTE for this page | |
42 | * HMM_DMIRROR_PROT_NONE: unpopulated PTE or PTE with no access | |
43 | * HMM_DMIRROR_PROT_READ: read-only PTE | |
44 | * HMM_DMIRROR_PROT_WRITE: read/write PTE | |
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45 | * HMM_DMIRROR_PROT_PMD: PMD sized page is fully mapped by same permissions |
46 | * HMM_DMIRROR_PROT_PUD: PUD sized page is fully mapped by same permissions | |
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47 | * HMM_DMIRROR_PROT_ZERO: special read-only zero page |
48 | * HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL: Migrated device private page on the | |
49 | * device the ioctl() is made | |
50 | * HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE: Migrated device private page on some | |
51 | * other device | |
52 | */ | |
53 | enum { | |
54 | HMM_DMIRROR_PROT_ERROR = 0xFF, | |
55 | HMM_DMIRROR_PROT_NONE = 0x00, | |
56 | HMM_DMIRROR_PROT_READ = 0x01, | |
57 | HMM_DMIRROR_PROT_WRITE = 0x02, | |
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58 | HMM_DMIRROR_PROT_PMD = 0x04, |
59 | HMM_DMIRROR_PROT_PUD = 0x08, | |
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60 | HMM_DMIRROR_PROT_ZERO = 0x10, |
61 | HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL = 0x20, | |
62 | HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE = 0x30, | |
63 | }; | |
64 | ||
65 | #endif /* _LIB_TEST_HMM_UAPI_H */ |