| 1 |
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| 2 | |
| 3 | * This is a module to test the HMM (Heterogeneous Memory Management) API
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| 4 | * of the kernel. It allows a userspace program to expose its entire address
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| 5 | * space through the HMM test module device file.
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| 6 |
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| 7 | #ifndef _LIB_TEST_HMM_UAPI_H
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| 8 | #define _LIB_TEST_HMM_UAPI_H
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| 9 |
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| 10 | #include <linux/types.h>
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| 11 | #include <linux/ioctl.h>
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| 12 |
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| 13 | |
| 14 | * Structure to pass to the HMM test driver to mimic a device accessing
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| 15 | * system memory and ZONE_DEVICE private memory through device page tables.
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| 16 | *
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| 17 | * @addr: (in) user address the device will read/write
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| 18 | * @ptr: (in) user address where device data is copied to/from
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| 19 | * @npages: (in) number of pages to read/write
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| 20 | * @cpages: (out) number of pages copied
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| 21 | * @faults: (out) number of device page faults seen
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| 22 |
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| 23 | struct hmm_dmirror_cmd {
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| 24 | __u64 addr;
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| 25 | __u64 ptr;
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| 26 | __u64 npages;
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| 27 | __u64 cpages;
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| 28 | __u64 faults;
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| 29 | };
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| 30 |
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| 31 |
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| 32 | #define HMM_DMIRROR_READ _IOWR('H', 0x00, struct hmm_dmirror_cmd)
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| 33 | #define HMM_DMIRROR_WRITE _IOWR('H', 0x01, struct hmm_dmirror_cmd)
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| 34 | #define HMM_DMIRROR_MIGRATE_TO_DEV _IOWR('H', 0x02, struct hmm_dmirror_cmd)
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| 35 | #define HMM_DMIRROR_MIGRATE_TO_SYS _IOWR('H', 0x03, struct hmm_dmirror_cmd)
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| 36 | #define HMM_DMIRROR_SNAPSHOT _IOWR('H', 0x04, struct hmm_dmirror_cmd)
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| 37 | #define HMM_DMIRROR_EXCLUSIVE _IOWR('H', 0x05, struct hmm_dmirror_cmd)
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| 38 | #define HMM_DMIRROR_CHECK_EXCLUSIVE _IOWR('H', 0x06, struct hmm_dmirror_cmd)
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| 39 | #define HMM_DMIRROR_RELEASE _IOWR('H', 0x07, struct hmm_dmirror_cmd)
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| 40 | #define HMM_DMIRROR_FLAGS _IOWR('H', 0x08, struct hmm_dmirror_cmd)
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| 41 | #define HMM_DMIRROR_READ_UNLOCKED _IOWR('H', 0x09, struct hmm_dmirror_cmd)
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| 42 |
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| 43 | #define HMM_DMIRROR_FLAG_FAIL_ALLOC (1ULL << 0)
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| 44 |
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| 45 | |
| 46 | * Values returned in hmm_dmirror_cmd.ptr for HMM_DMIRROR_SNAPSHOT.
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| 47 | * HMM_DMIRROR_PROT_ERROR: no valid mirror PTE for this page
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| 48 | * HMM_DMIRROR_PROT_NONE: unpopulated PTE or PTE with no access
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| 49 | * HMM_DMIRROR_PROT_READ: read-only PTE
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| 50 | * HMM_DMIRROR_PROT_WRITE: read/write PTE
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| 51 | * HMM_DMIRROR_PROT_PMD: PMD sized page is fully mapped by same permissions
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| 52 | * HMM_DMIRROR_PROT_PUD: PUD sized page is fully mapped by same permissions
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| 53 | * HMM_DMIRROR_PROT_ZERO: special read-only zero page
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| 54 | * HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL: Migrated device private page on the
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| 55 | * device the ioctl() is made
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| 56 | * HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE: Migrated device private page on some
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| 57 | * other device
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| 58 | * HMM_DMIRROR_PROT_DEV_COHERENT: Migrate device coherent page on the device
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| 59 | * the ioctl() is made
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| 60 |
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| 61 | enum {
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| 62 | HMM_DMIRROR_PROT_ERROR = 0xFF,
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| 63 | HMM_DMIRROR_PROT_NONE = 0x00,
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| 64 | HMM_DMIRROR_PROT_READ = 0x01,
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| 65 | HMM_DMIRROR_PROT_WRITE = 0x02,
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| 66 | HMM_DMIRROR_PROT_PMD = 0x04,
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| 67 | HMM_DMIRROR_PROT_PUD = 0x08,
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| 68 | HMM_DMIRROR_PROT_ZERO = 0x10,
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| 69 | HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL = 0x20,
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| 70 | HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE = 0x30,
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| 71 | HMM_DMIRROR_PROT_DEV_COHERENT_LOCAL = 0x40,
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| 72 | HMM_DMIRROR_PROT_DEV_COHERENT_REMOTE = 0x50,
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| 73 | };
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| 74 |
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| 75 | enum {
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| 76 |
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| 77 | HMM_DMIRROR_MEMORY_DEVICE_PRIVATE = 1,
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| 78 | HMM_DMIRROR_MEMORY_DEVICE_COHERENT,
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| 79 | };
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| 80 |
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| 81 | #endif
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