/* 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_TO_DEV	_IOWR('H', 0x02, struct hmm_dmirror_cmd)#define HMM_DMIRROR_MIGRATE_TO_SYS	_IOWR('H', 0x03, struct hmm_dmirror_cmd)#define HMM_DMIRROR_SNAPSHOT		_IOWR('H', 0x04, struct hmm_dmirror_cmd)#define HMM_DMIRROR_EXCLUSIVE		_IOWR('H', 0x05, struct hmm_dmirror_cmd)#define HMM_DMIRROR_CHECK_EXCLUSIVE	_IOWR('H', 0x06, struct hmm_dmirror_cmd)#define HMM_DMIRROR_RELEASE		_IOWR('H', 0x07, struct hmm_dmirror_cmd)#define HMM_DMIRROR_FLAGS		_IOWR('H', 0x08, struct hmm_dmirror_cmd)#define HMM_DMIRROR_READ_UNLOCKED	_IOWR('H', 0x09, struct hmm_dmirror_cmd) #define HMM_DMIRROR_FLAG_FAIL_ALLOC	(1ULL << 0) /* * 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 * HMM_DMIRROR_PROT_DEV_COHERENT: Migrate device coherent page on the device *				  the ioctl() is made */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,	HMM_DMIRROR_PROT_DEV_COHERENT_LOCAL	= 0x40,	HMM_DMIRROR_PROT_DEV_COHERENT_REMOTE	= 0x50,}; enum {	/* 0 is reserved to catch uninitialized type fields */	HMM_DMIRROR_MEMORY_DEVICE_PRIVATE = 1,	HMM_DMIRROR_MEMORY_DEVICE_COHERENT,}; #endif /* _LIB_TEST_HMM_UAPI_H */