projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2ef9f5a RC |
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) | |
| 36 | ||
| 37 | /* | |
| 38 | * Values returned in hmm_dmirror_cmd.ptr for HMM_DMIRROR_SNAPSHOT. | |
| 39 | * HMM_DMIRROR_PROT_ERROR: no valid mirror PTE for this page | |
| 40 | * HMM_DMIRROR_PROT_NONE: unpopulated PTE or PTE with no access | |
| 41 | * HMM_DMIRROR_PROT_READ: read-only PTE | |
| 42 | * HMM_DMIRROR_PROT_WRITE: read/write PTE | |
| 43 | * HMM_DMIRROR_PROT_ZERO: special read-only zero page | |
| 44 | * HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL: Migrated device private page on the | |
| 45 | * device the ioctl() is made | |
| 46 | * HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE: Migrated device private page on some | |
| 47 | * other device | |
| 48 | */ | |
| 49 | enum { | |
| 50 | HMM_DMIRROR_PROT_ERROR = 0xFF, | |
| 51 | HMM_DMIRROR_PROT_NONE = 0x00, | |
| 52 | HMM_DMIRROR_PROT_READ = 0x01, | |
| 53 | HMM_DMIRROR_PROT_WRITE = 0x02, | |
| 54 | HMM_DMIRROR_PROT_ZERO = 0x10, | |
| 55 | HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL = 0x20, | |
| 56 | HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE = 0x30, | |
| 57 | }; | |
| 58 | ||
| 59 | #endif /* _LIB_TEST_HMM_UAPI_H */ |