/* 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;
};
/* * 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 */
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