/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* This is a module to test the HMM (Heterogeneous Memory Management) API
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* of the kernel. It allows a userspace program to expose its entire address
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* space through the HMM test module device file.
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*/
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#ifndef _LIB_TEST_HMM_UAPI_H
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#define _LIB_TEST_HMM_UAPI_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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/*
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* Structure to pass to the HMM test driver to mimic a device accessing
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* system memory and ZONE_DEVICE private memory through device page tables.
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*
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* @addr: (in) user address the device will read/write
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* @ptr: (in) user address where device data is copied to/from
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* @npages: (in) number of pages to read/write
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* @cpages: (out) number of pages copied
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* @faults: (out) number of device page faults seen
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*/
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struct hmm_dmirror_cmd {
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__u64 addr;
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__u64 ptr;
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__u64 npages;
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__u64 cpages;
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__u64 faults;
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};
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/* Expose the address space of the calling process through hmm device file */
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#define HMM_DMIRROR_READ _IOWR('H', 0x00, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_WRITE _IOWR('H', 0x01, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_MIGRATE _IOWR('H', 0x02, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_SNAPSHOT _IOWR('H', 0x03, struct hmm_dmirror_cmd)
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/*
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* Values returned in hmm_dmirror_cmd.ptr for HMM_DMIRROR_SNAPSHOT.
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* HMM_DMIRROR_PROT_ERROR: no valid mirror PTE for this page
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* HMM_DMIRROR_PROT_NONE: unpopulated PTE or PTE with no access
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* HMM_DMIRROR_PROT_READ: read-only PTE
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* HMM_DMIRROR_PROT_WRITE: read/write PTE
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* HMM_DMIRROR_PROT_PMD: PMD sized page is fully mapped by same permissions
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* HMM_DMIRROR_PROT_PUD: PUD sized page is fully mapped by same permissions
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* HMM_DMIRROR_PROT_ZERO: special read-only zero page
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* HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL: Migrated device private page on the
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* device the ioctl() is made
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* HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE: Migrated device private page on some
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* other device
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*/
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enum {
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HMM_DMIRROR_PROT_ERROR = 0xFF,
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HMM_DMIRROR_PROT_NONE = 0x00,
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HMM_DMIRROR_PROT_READ = 0x01,
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HMM_DMIRROR_PROT_WRITE = 0x02,
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HMM_DMIRROR_PROT_PMD = 0x04,
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HMM_DMIRROR_PROT_PUD = 0x08,
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HMM_DMIRROR_PROT_ZERO = 0x10,
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HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL = 0x20,
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HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE = 0x30,
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};
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#endif /* _LIB_TEST_HMM_UAPI_H */
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