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Device Coherent type uses device memory that is coherently accesible by the CPU. This could be shown as SP (special purpose) memory range at the BIOS-e820 memory enumeration. If no SP memory is supported in system, this could be faked by setting CONFIG_EFI_FAKE_MEMMAP. Currently, test_hmm only supports two different SP ranges of at least 256MB size. This could be specified in the kernel parameter variable efi_fake_mem. Ex. Two SP ranges of 1GB starting at 0x100000000 & 0x140000000 physical address. Ex. efi_fake_mem=1G@0x100000000:0x40000,1G@0x140000000:0x40000 Private and coherent device mirror instances can be created in the same probed. This is done by passing the module parameters spm_addr_dev0 & spm_addr_dev1. In this case, it will create four instances of device_mirror. The first two correspond to private device type, the last two to coherent type. Then, they can be easily accessed from user space through /dev/hmm_mirror<num_device>. Usually num_device 0 and 1 are for private, and 2 and 3 for coherent types. If no module parameters are passed, two instances of private type device_mirror will be created only. Link: https://lkml.kernel.org/r/20220715150521.18165-11-alex.sierra@amd.com Signed-off-by: Alex Sierra <alex.sierra@amd.com> Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Alistair Poppple <apopple@nvidia.com> Cc: Christoph Hellwig <hch@lst.de> Cc: David Hildenbrand <david@redhat.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Ralph Campbell <rcampbell@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
76 lines
2.8 KiB
C
76 lines
2.8 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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/*
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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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