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- /* 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_PMD: PMD sized page is fully mapped by same permissions
- * HMM_DMIRROR_PROT_PUD: PUD sized page is fully mapped by same permissions
- * 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_PMD = 0x04,
- HMM_DMIRROR_PROT_PUD = 0x08,
- 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 */
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