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Add HMM_DMIRROR_FLAG_FAIL_ALLOC flag to simulate large page allocation failures, enabling testing of split migration code paths. This test flag allows validation of the fallback behavior when destination device cannot allocate compound pages. This is useful for testing the split migration functionality. Link: https://lkml.kernel.org/r/20251001065707.920170-13-balbirs@nvidia.com Signed-off-by: Balbir Singh <balbirs@nvidia.com> Cc: David Hildenbrand <david@redhat.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Joshua Hahn <joshua.hahnjy@gmail.com> Cc: Rakie Kim <rakie.kim@sk.com> Cc: Byungchul Park <byungchul@sk.com> Cc: Gregory Price <gourry@gourry.net> Cc: Ying Huang <ying.huang@linux.alibaba.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com> Cc: Nico Pache <npache@redhat.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Dev Jain <dev.jain@arm.com> Cc: Barry Song <baohua@kernel.org> Cc: Lyude Paul <lyude@redhat.com> Cc: Danilo Krummrich <dakr@kernel.org> Cc: David Airlie <airlied@gmail.com> Cc: Simona Vetter <simona@ffwll.ch> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Mika Penttilä <mpenttil@redhat.com> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Francois Dugast <francois.dugast@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
81 lines
3.0 KiB
C
81 lines
3.0 KiB
C
/* 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_TO_DEV _IOWR('H', 0x02, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_MIGRATE_TO_SYS _IOWR('H', 0x03, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_SNAPSHOT _IOWR('H', 0x04, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_EXCLUSIVE _IOWR('H', 0x05, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_CHECK_EXCLUSIVE _IOWR('H', 0x06, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_RELEASE _IOWR('H', 0x07, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_FLAGS _IOWR('H', 0x08, struct hmm_dmirror_cmd)
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#define HMM_DMIRROR_FLAG_FAIL_ALLOC (1ULL << 0)
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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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* HMM_DMIRROR_PROT_DEV_COHERENT: Migrate device coherent page on the device
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* the ioctl() is made
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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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HMM_DMIRROR_PROT_DEV_COHERENT_LOCAL = 0x40,
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HMM_DMIRROR_PROT_DEV_COHERENT_REMOTE = 0x50,
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};
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enum {
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/* 0 is reserved to catch uninitialized type fields */
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HMM_DMIRROR_MEMORY_DEVICE_PRIVATE = 1,
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HMM_DMIRROR_MEMORY_DEVICE_COHERENT,
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};
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#endif /* _LIB_TEST_HMM_UAPI_H */
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