/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * This is a module to test the HMM (Heterogeneous Memory Management) API * of the kernel. It allows a userspace program to expose its entire address * space through the HMM test module device file. */ #ifndef _LIB_TEST_HMM_UAPI_H #define _LIB_TEST_HMM_UAPI_H #include <linux/types.h> #include <linux/ioctl.h> /* * Structure to pass to the HMM test driver to mimic a device accessing * system memory and ZONE_DEVICE private memory through device page tables. * * @addr: (in) user address the device will read/write * @ptr: (in) user address where device data is copied to/from * @npages: (in) number of pages to read/write * @cpages: (out) number of pages copied * @faults: (out) number of device page faults seen */ struct hmm_dmirror_cmd { __u64 addr; __u64 ptr; __u64 npages; __u64 cpages; __u64 faults; }; /* Expose the address space of the calling process through hmm device file */ #define HMM_DMIRROR_READ _IOWR('H', 0x00, struct hmm_dmirror_cmd) #define HMM_DMIRROR_WRITE _IOWR('H', 0x01, struct hmm_dmirror_cmd) #define HMM_DMIRROR_MIGRATE _IOWR('H', 0x02, struct hmm_dmirror_cmd) #define HMM_DMIRROR_SNAPSHOT _IOWR('H', 0x03, struct hmm_dmirror_cmd) /* * Values returned in hmm_dmirror_cmd.ptr for HMM_DMIRROR_SNAPSHOT. * HMM_DMIRROR_PROT_ERROR: no valid mirror PTE for this page * HMM_DMIRROR_PROT_NONE: unpopulated PTE or PTE with no access * HMM_DMIRROR_PROT_READ: read-only PTE * HMM_DMIRROR_PROT_WRITE: read/write PTE * HMM_DMIRROR_PROT_ZERO: special read-only zero page * HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL: Migrated device private page on the * device the ioctl() is made * HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE: Migrated device private page on some * other device */ enum { HMM_DMIRROR_PROT_ERROR = 0xFF, HMM_DMIRROR_PROT_NONE = 0x00, HMM_DMIRROR_PROT_READ = 0x01, HMM_DMIRROR_PROT_WRITE = 0x02, HMM_DMIRROR_PROT_ZERO = 0x10, HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL = 0x20, HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE = 0x30, }; #endif /* _LIB_TEST_HMM_UAPI_H */