mm/hmm/test: add selftest driver for HMM (b2ef9f5a) · Commits · 戴 / test

lib/Kconfig.debug

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		@@ -2201,6 +2201,19 @@ config TEST_MEMINIT

		If unsure, say N.

		config TEST_HMM
		tristate "Test HMM (Heterogeneous Memory Management)"
		depends on TRANSPARENT_HUGEPAGE
		depends on DEVICE_PRIVATE
		select HMM_MIRROR
		select MMU_NOTIFIER
		help
		This is a pseudo device driver solely for testing HMM.
		Say M here if you want to build the HMM test module.
		Doing so will allow you to run tools/testing/selftest/vm/hmm-tests.

		If unsure, say N.

		endif # RUNTIME_TESTING_MENU

		config MEMTEST

lib/Makefile

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		@@ -92,6 +92,7 @@ obj-$(CONFIG_TEST_STACKINIT) += test_stackinit.o
		obj-$(CONFIG_TEST_BLACKHOLE_DEV) += test_blackhole_dev.o
		obj-$(CONFIG_TEST_MEMINIT) += test_meminit.o
		obj-$(CONFIG_TEST_LOCKUP) += test_lockup.o
		obj-$(CONFIG_TEST_HMM) += test_hmm.o

		obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/

lib/test_hmm.c

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File added.

Preview size limit exceeded, changes collapsed.

lib/test_hmm_uapi.h

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		/* 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 _IOWR('H', 0x02, struct hmm_dmirror_cmd)
		#define HMM_DMIRROR_SNAPSHOT _IOWR('H', 0x03, struct hmm_dmirror_cmd)

		/*
		* 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_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
		*/
		enum {
		HMM_DMIRROR_PROT_ERROR = 0xFF,
		HMM_DMIRROR_PROT_NONE = 0x00,
		HMM_DMIRROR_PROT_READ = 0x01,
		HMM_DMIRROR_PROT_WRITE = 0x02,
		HMM_DMIRROR_PROT_ZERO = 0x10,
		HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL = 0x20,
		HMM_DMIRROR_PROT_DEV_PRIVATE_REMOTE = 0x30,
		};

		#endif /* _LIB_TEST_HMM_UAPI_H */

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