976 lines
27 KiB
C
976 lines
27 KiB
C
/*-
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* SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
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*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_kern.c 8.3 (Berkeley) 1/12/94
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* Kernel memory management.
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*/
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#include <sys/cdefs.h>
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/asan.h>
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#include <sys/domainset.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/msan.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/vmem.h>
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#include <sys/vmmeter.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_domainset.h>
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#include <vm/vm_kern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_pagequeue.h>
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#include <vm/vm_phys.h>
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#include <vm/vm_radix.h>
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#include <vm/vm_extern.h>
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#include <vm/uma.h>
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struct vm_map kernel_map_store;
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struct vm_map exec_map_store;
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struct vm_map pipe_map_store;
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const void *zero_region;
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CTASSERT((ZERO_REGION_SIZE & PAGE_MASK) == 0);
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/* NB: Used by kernel debuggers. */
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const u_long vm_maxuser_address = VM_MAXUSER_ADDRESS;
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u_int exec_map_entry_size;
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u_int exec_map_entries;
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SYSCTL_ULONG(_vm, OID_AUTO, min_kernel_address, CTLFLAG_RD,
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SYSCTL_NULL_ULONG_PTR, VM_MIN_KERNEL_ADDRESS, "Min kernel address");
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SYSCTL_ULONG(_vm, OID_AUTO, max_kernel_address, CTLFLAG_RD,
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#if defined(__arm__)
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&vm_max_kernel_address, 0,
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#else
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SYSCTL_NULL_ULONG_PTR, VM_MAX_KERNEL_ADDRESS,
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#endif
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"Max kernel address");
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#if VM_NRESERVLEVEL > 0
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#define KVA_QUANTUM_SHIFT (VM_LEVEL_0_ORDER + PAGE_SHIFT)
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#else
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/* On non-superpage architectures we want large import sizes. */
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#define KVA_QUANTUM_SHIFT (8 + PAGE_SHIFT)
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#endif
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#define KVA_QUANTUM (1ul << KVA_QUANTUM_SHIFT)
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#define KVA_NUMA_IMPORT_QUANTUM (KVA_QUANTUM * 128)
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extern void uma_startup2(void);
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/*
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* kva_alloc:
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*
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* Allocate a virtual address range with no underlying object and
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* no initial mapping to physical memory. Any mapping from this
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* range to physical memory must be explicitly created prior to
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* its use, typically with pmap_qenter(). Any attempt to create
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* a mapping on demand through vm_fault() will result in a panic.
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*/
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vm_offset_t
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kva_alloc(vm_size_t size)
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{
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vm_offset_t addr;
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TSENTER();
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size = round_page(size);
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if (vmem_alloc(kernel_arena, size, M_BESTFIT | M_NOWAIT, &addr))
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return (0);
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TSEXIT();
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return (addr);
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}
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/*
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* kva_free:
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*
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* Release a region of kernel virtual memory allocated
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* with kva_alloc, and return the physical pages
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* associated with that region.
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*
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* This routine may not block on kernel maps.
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*/
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void
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kva_free(vm_offset_t addr, vm_size_t size)
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{
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size = round_page(size);
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vmem_free(kernel_arena, addr, size);
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}
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/*
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* Update sanitizer shadow state to reflect a new allocation. Force inlining to
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* help make KMSAN origin tracking more precise.
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*/
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static __always_inline void
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kmem_alloc_san(vm_offset_t addr, vm_size_t size, vm_size_t asize, int flags)
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{
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if ((flags & M_ZERO) == 0) {
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kmsan_mark((void *)addr, asize, KMSAN_STATE_UNINIT);
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kmsan_orig((void *)addr, asize, KMSAN_TYPE_KMEM,
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KMSAN_RET_ADDR);
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} else {
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kmsan_mark((void *)addr, asize, KMSAN_STATE_INITED);
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}
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kasan_mark((void *)addr, size, asize, KASAN_KMEM_REDZONE);
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}
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static vm_page_t
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kmem_alloc_contig_pages(vm_object_t object, vm_pindex_t pindex, int domain,
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int pflags, u_long npages, vm_paddr_t low, vm_paddr_t high,
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u_long alignment, vm_paddr_t boundary, vm_memattr_t memattr)
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{
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vm_page_t m;
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int tries;
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bool wait, reclaim;
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VM_OBJECT_ASSERT_WLOCKED(object);
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wait = (pflags & VM_ALLOC_WAITOK) != 0;
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reclaim = (pflags & VM_ALLOC_NORECLAIM) == 0;
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pflags &= ~(VM_ALLOC_NOWAIT | VM_ALLOC_WAITOK | VM_ALLOC_WAITFAIL);
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pflags |= VM_ALLOC_NOWAIT;
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for (tries = wait ? 3 : 1;; tries--) {
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m = vm_page_alloc_contig_domain(object, pindex, domain, pflags,
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npages, low, high, alignment, boundary, memattr);
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if (m != NULL || tries == 0 || !reclaim)
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break;
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VM_OBJECT_WUNLOCK(object);
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if (!vm_page_reclaim_contig_domain(domain, pflags, npages,
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low, high, alignment, boundary) && wait)
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vm_wait_domain(domain);
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VM_OBJECT_WLOCK(object);
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}
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return (m);
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}
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/*
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* Allocates a region from the kernel address map and physical pages
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* within the specified address range to the kernel object. Creates a
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* wired mapping from this region to these pages, and returns the
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* region's starting virtual address. The allocated pages are not
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* necessarily physically contiguous. If M_ZERO is specified through the
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* given flags, then the pages are zeroed before they are mapped.
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*/
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static void *
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kmem_alloc_attr_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
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vm_paddr_t high, vm_memattr_t memattr)
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{
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vmem_t *vmem;
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vm_object_t object;
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vm_offset_t addr, i, offset;
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vm_page_t m;
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vm_size_t asize;
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int pflags;
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vm_prot_t prot;
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object = kernel_object;
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asize = round_page(size);
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vmem = vm_dom[domain].vmd_kernel_arena;
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if (vmem_alloc(vmem, asize, M_BESTFIT | flags, &addr))
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return (0);
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offset = addr - VM_MIN_KERNEL_ADDRESS;
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pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
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prot = (flags & M_EXEC) != 0 ? VM_PROT_ALL : VM_PROT_RW;
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VM_OBJECT_WLOCK(object);
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for (i = 0; i < asize; i += PAGE_SIZE) {
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m = kmem_alloc_contig_pages(object, atop(offset + i),
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domain, pflags, 1, low, high, PAGE_SIZE, 0, memattr);
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if (m == NULL) {
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VM_OBJECT_WUNLOCK(object);
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kmem_unback(object, addr, i);
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vmem_free(vmem, addr, asize);
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return (0);
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}
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KASSERT(vm_page_domain(m) == domain,
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("kmem_alloc_attr_domain: Domain mismatch %d != %d",
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vm_page_domain(m), domain));
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if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
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pmap_zero_page(m);
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vm_page_valid(m);
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pmap_enter(kernel_pmap, addr + i, m, prot,
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prot | PMAP_ENTER_WIRED, 0);
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}
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VM_OBJECT_WUNLOCK(object);
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kmem_alloc_san(addr, size, asize, flags);
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return ((void *)addr);
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}
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void *
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kmem_alloc_attr(vm_size_t size, int flags, vm_paddr_t low, vm_paddr_t high,
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vm_memattr_t memattr)
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{
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return (kmem_alloc_attr_domainset(DOMAINSET_RR(), size, flags, low,
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high, memattr));
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}
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void *
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kmem_alloc_attr_domainset(struct domainset *ds, vm_size_t size, int flags,
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vm_paddr_t low, vm_paddr_t high, vm_memattr_t memattr)
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{
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struct vm_domainset_iter di;
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void *addr;
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int domain;
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vm_domainset_iter_policy_init(&di, ds, &domain, &flags);
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do {
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addr = kmem_alloc_attr_domain(domain, size, flags, low, high,
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memattr);
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if (addr != NULL)
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break;
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} while (vm_domainset_iter_policy(&di, &domain) == 0);
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return (addr);
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}
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/*
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* Allocates a region from the kernel address map and physically
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* contiguous pages within the specified address range to the kernel
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* object. Creates a wired mapping from this region to these pages, and
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* returns the region's starting virtual address. If M_ZERO is specified
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* through the given flags, then the pages are zeroed before they are
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* mapped.
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*/
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static void *
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kmem_alloc_contig_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
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vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
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vm_memattr_t memattr)
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{
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vmem_t *vmem;
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vm_object_t object;
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vm_offset_t addr, offset, tmp;
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vm_page_t end_m, m;
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vm_size_t asize;
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u_long npages;
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int pflags;
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object = kernel_object;
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asize = round_page(size);
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vmem = vm_dom[domain].vmd_kernel_arena;
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if (vmem_alloc(vmem, asize, flags | M_BESTFIT, &addr))
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return (NULL);
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offset = addr - VM_MIN_KERNEL_ADDRESS;
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pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
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npages = atop(asize);
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VM_OBJECT_WLOCK(object);
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m = kmem_alloc_contig_pages(object, atop(offset), domain,
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pflags, npages, low, high, alignment, boundary, memattr);
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if (m == NULL) {
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VM_OBJECT_WUNLOCK(object);
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vmem_free(vmem, addr, asize);
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return (NULL);
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}
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KASSERT(vm_page_domain(m) == domain,
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("kmem_alloc_contig_domain: Domain mismatch %d != %d",
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vm_page_domain(m), domain));
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end_m = m + npages;
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tmp = addr;
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for (; m < end_m; m++) {
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if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
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pmap_zero_page(m);
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vm_page_valid(m);
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pmap_enter(kernel_pmap, tmp, m, VM_PROT_RW,
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VM_PROT_RW | PMAP_ENTER_WIRED, 0);
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tmp += PAGE_SIZE;
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}
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VM_OBJECT_WUNLOCK(object);
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kmem_alloc_san(addr, size, asize, flags);
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return ((void *)addr);
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}
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void *
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kmem_alloc_contig(vm_size_t size, int flags, vm_paddr_t low, vm_paddr_t high,
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u_long alignment, vm_paddr_t boundary, vm_memattr_t memattr)
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{
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return (kmem_alloc_contig_domainset(DOMAINSET_RR(), size, flags, low,
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high, alignment, boundary, memattr));
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}
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void *
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kmem_alloc_contig_domainset(struct domainset *ds, vm_size_t size, int flags,
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vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
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vm_memattr_t memattr)
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{
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struct vm_domainset_iter di;
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void *addr;
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int domain;
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vm_domainset_iter_policy_init(&di, ds, &domain, &flags);
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do {
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addr = kmem_alloc_contig_domain(domain, size, flags, low, high,
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alignment, boundary, memattr);
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if (addr != NULL)
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break;
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} while (vm_domainset_iter_policy(&di, &domain) == 0);
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return (addr);
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}
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/*
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* kmem_subinit:
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*
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* Initializes a map to manage a subrange
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* of the kernel virtual address space.
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*
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* Arguments are as follows:
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*
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* parent Map to take range from
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* min, max Returned endpoints of map
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* size Size of range to find
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* superpage_align Request that min is superpage aligned
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*/
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void
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kmem_subinit(vm_map_t map, vm_map_t parent, vm_offset_t *min, vm_offset_t *max,
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vm_size_t size, bool superpage_align)
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{
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int ret;
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size = round_page(size);
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*min = vm_map_min(parent);
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ret = vm_map_find(parent, NULL, 0, min, size, 0, superpage_align ?
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VMFS_SUPER_SPACE : VMFS_ANY_SPACE, VM_PROT_ALL, VM_PROT_ALL,
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MAP_ACC_NO_CHARGE);
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if (ret != KERN_SUCCESS)
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panic("kmem_subinit: bad status return of %d", ret);
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*max = *min + size;
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vm_map_init(map, vm_map_pmap(parent), *min, *max);
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if (vm_map_submap(parent, *min, *max, map) != KERN_SUCCESS)
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panic("kmem_subinit: unable to change range to submap");
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}
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|
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/*
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* kmem_malloc_domain:
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*
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* Allocate wired-down pages in the kernel's address space.
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*/
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static void *
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kmem_malloc_domain(int domain, vm_size_t size, int flags)
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{
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vmem_t *arena;
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vm_offset_t addr;
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vm_size_t asize;
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int rv;
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if (__predict_true((flags & M_EXEC) == 0))
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arena = vm_dom[domain].vmd_kernel_arena;
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else
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arena = vm_dom[domain].vmd_kernel_rwx_arena;
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asize = round_page(size);
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if (vmem_alloc(arena, asize, flags | M_BESTFIT, &addr))
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return (0);
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rv = kmem_back_domain(domain, kernel_object, addr, asize, flags);
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if (rv != KERN_SUCCESS) {
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vmem_free(arena, addr, asize);
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return (0);
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}
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kasan_mark((void *)addr, size, asize, KASAN_KMEM_REDZONE);
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return ((void *)addr);
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}
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void *
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kmem_malloc(vm_size_t size, int flags)
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{
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void * p;
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TSENTER();
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p = kmem_malloc_domainset(DOMAINSET_RR(), size, flags);
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TSEXIT();
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return (p);
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}
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|
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void *
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kmem_malloc_domainset(struct domainset *ds, vm_size_t size, int flags)
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{
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struct vm_domainset_iter di;
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void *addr;
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int domain;
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|
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vm_domainset_iter_policy_init(&di, ds, &domain, &flags);
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do {
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addr = kmem_malloc_domain(domain, size, flags);
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if (addr != NULL)
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break;
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} while (vm_domainset_iter_policy(&di, &domain) == 0);
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|
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return (addr);
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}
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|
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/*
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* kmem_back_domain:
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*
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* Allocate physical pages from the specified domain for the specified
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* virtual address range.
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*/
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int
|
|
kmem_back_domain(int domain, vm_object_t object, vm_offset_t addr,
|
|
vm_size_t size, int flags)
|
|
{
|
|
vm_offset_t offset, i;
|
|
vm_page_t m, mpred;
|
|
vm_prot_t prot;
|
|
int pflags;
|
|
|
|
KASSERT(object == kernel_object,
|
|
("kmem_back_domain: only supports kernel object."));
|
|
|
|
offset = addr - VM_MIN_KERNEL_ADDRESS;
|
|
pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
|
|
pflags &= ~(VM_ALLOC_NOWAIT | VM_ALLOC_WAITOK | VM_ALLOC_WAITFAIL);
|
|
if (flags & M_WAITOK)
|
|
pflags |= VM_ALLOC_WAITFAIL;
|
|
prot = (flags & M_EXEC) != 0 ? VM_PROT_ALL : VM_PROT_RW;
|
|
|
|
i = 0;
|
|
VM_OBJECT_WLOCK(object);
|
|
retry:
|
|
mpred = vm_radix_lookup_le(&object->rtree, atop(offset + i));
|
|
for (; i < size; i += PAGE_SIZE, mpred = m) {
|
|
m = vm_page_alloc_domain_after(object, atop(offset + i),
|
|
domain, pflags, mpred);
|
|
|
|
/*
|
|
* Ran out of space, free everything up and return. Don't need
|
|
* to lock page queues here as we know that the pages we got
|
|
* aren't on any queues.
|
|
*/
|
|
if (m == NULL) {
|
|
if ((flags & M_NOWAIT) == 0)
|
|
goto retry;
|
|
VM_OBJECT_WUNLOCK(object);
|
|
kmem_unback(object, addr, i);
|
|
return (KERN_NO_SPACE);
|
|
}
|
|
KASSERT(vm_page_domain(m) == domain,
|
|
("kmem_back_domain: Domain mismatch %d != %d",
|
|
vm_page_domain(m), domain));
|
|
if (flags & M_ZERO && (m->flags & PG_ZERO) == 0)
|
|
pmap_zero_page(m);
|
|
KASSERT((m->oflags & VPO_UNMANAGED) != 0,
|
|
("kmem_malloc: page %p is managed", m));
|
|
vm_page_valid(m);
|
|
pmap_enter(kernel_pmap, addr + i, m, prot,
|
|
prot | PMAP_ENTER_WIRED, 0);
|
|
if (__predict_false((prot & VM_PROT_EXECUTE) != 0))
|
|
m->oflags |= VPO_KMEM_EXEC;
|
|
}
|
|
VM_OBJECT_WUNLOCK(object);
|
|
kmem_alloc_san(addr, size, size, flags);
|
|
return (KERN_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* kmem_back:
|
|
*
|
|
* Allocate physical pages for the specified virtual address range.
|
|
*/
|
|
int
|
|
kmem_back(vm_object_t object, vm_offset_t addr, vm_size_t size, int flags)
|
|
{
|
|
vm_offset_t end, next, start;
|
|
int domain, rv;
|
|
|
|
KASSERT(object == kernel_object,
|
|
("kmem_back: only supports kernel object."));
|
|
|
|
for (start = addr, end = addr + size; addr < end; addr = next) {
|
|
/*
|
|
* We must ensure that pages backing a given large virtual page
|
|
* all come from the same physical domain.
|
|
*/
|
|
if (vm_ndomains > 1) {
|
|
domain = (addr >> KVA_QUANTUM_SHIFT) % vm_ndomains;
|
|
while (VM_DOMAIN_EMPTY(domain))
|
|
domain++;
|
|
next = roundup2(addr + 1, KVA_QUANTUM);
|
|
if (next > end || next < start)
|
|
next = end;
|
|
} else {
|
|
domain = 0;
|
|
next = end;
|
|
}
|
|
rv = kmem_back_domain(domain, object, addr, next - addr, flags);
|
|
if (rv != KERN_SUCCESS) {
|
|
kmem_unback(object, start, addr - start);
|
|
break;
|
|
}
|
|
}
|
|
return (rv);
|
|
}
|
|
|
|
/*
|
|
* kmem_unback:
|
|
*
|
|
* Unmap and free the physical pages underlying the specified virtual
|
|
* address range.
|
|
*
|
|
* A physical page must exist within the specified object at each index
|
|
* that is being unmapped.
|
|
*/
|
|
static struct vmem *
|
|
_kmem_unback(vm_object_t object, vm_offset_t addr, vm_size_t size)
|
|
{
|
|
struct vmem *arena;
|
|
vm_page_t m, next;
|
|
vm_offset_t end, offset;
|
|
int domain;
|
|
|
|
KASSERT(object == kernel_object,
|
|
("kmem_unback: only supports kernel object."));
|
|
|
|
if (size == 0)
|
|
return (NULL);
|
|
pmap_remove(kernel_pmap, addr, addr + size);
|
|
offset = addr - VM_MIN_KERNEL_ADDRESS;
|
|
end = offset + size;
|
|
VM_OBJECT_WLOCK(object);
|
|
m = vm_page_lookup(object, atop(offset));
|
|
domain = vm_page_domain(m);
|
|
if (__predict_true((m->oflags & VPO_KMEM_EXEC) == 0))
|
|
arena = vm_dom[domain].vmd_kernel_arena;
|
|
else
|
|
arena = vm_dom[domain].vmd_kernel_rwx_arena;
|
|
for (; offset < end; offset += PAGE_SIZE, m = next) {
|
|
next = vm_page_next(m);
|
|
vm_page_xbusy_claim(m);
|
|
vm_page_unwire_noq(m);
|
|
vm_page_free(m);
|
|
}
|
|
VM_OBJECT_WUNLOCK(object);
|
|
|
|
return (arena);
|
|
}
|
|
|
|
void
|
|
kmem_unback(vm_object_t object, vm_offset_t addr, vm_size_t size)
|
|
{
|
|
|
|
(void)_kmem_unback(object, addr, size);
|
|
}
|
|
|
|
/*
|
|
* kmem_free:
|
|
*
|
|
* Free memory allocated with kmem_malloc. The size must match the
|
|
* original allocation.
|
|
*/
|
|
void
|
|
kmem_free(void *addr, vm_size_t size)
|
|
{
|
|
struct vmem *arena;
|
|
|
|
size = round_page(size);
|
|
kasan_mark(addr, size, size, 0);
|
|
arena = _kmem_unback(kernel_object, (uintptr_t)addr, size);
|
|
if (arena != NULL)
|
|
vmem_free(arena, (uintptr_t)addr, size);
|
|
}
|
|
|
|
/*
|
|
* kmap_alloc_wait:
|
|
*
|
|
* Allocates pageable memory from a sub-map of the kernel. If the submap
|
|
* has no room, the caller sleeps waiting for more memory in the submap.
|
|
*
|
|
* This routine may block.
|
|
*/
|
|
vm_offset_t
|
|
kmap_alloc_wait(vm_map_t map, vm_size_t size)
|
|
{
|
|
vm_offset_t addr;
|
|
|
|
size = round_page(size);
|
|
if (!swap_reserve(size))
|
|
return (0);
|
|
|
|
for (;;) {
|
|
/*
|
|
* To make this work for more than one map, use the map's lock
|
|
* to lock out sleepers/wakers.
|
|
*/
|
|
vm_map_lock(map);
|
|
addr = vm_map_findspace(map, vm_map_min(map), size);
|
|
if (addr + size <= vm_map_max(map))
|
|
break;
|
|
/* no space now; see if we can ever get space */
|
|
if (vm_map_max(map) - vm_map_min(map) < size) {
|
|
vm_map_unlock(map);
|
|
swap_release(size);
|
|
return (0);
|
|
}
|
|
map->needs_wakeup = TRUE;
|
|
vm_map_unlock_and_wait(map, 0);
|
|
}
|
|
vm_map_insert(map, NULL, 0, addr, addr + size, VM_PROT_RW, VM_PROT_RW,
|
|
MAP_ACC_CHARGED);
|
|
vm_map_unlock(map);
|
|
return (addr);
|
|
}
|
|
|
|
/*
|
|
* kmap_free_wakeup:
|
|
*
|
|
* Returns memory to a submap of the kernel, and wakes up any processes
|
|
* waiting for memory in that map.
|
|
*/
|
|
void
|
|
kmap_free_wakeup(vm_map_t map, vm_offset_t addr, vm_size_t size)
|
|
{
|
|
|
|
vm_map_lock(map);
|
|
(void) vm_map_delete(map, trunc_page(addr), round_page(addr + size));
|
|
if (map->needs_wakeup) {
|
|
map->needs_wakeup = FALSE;
|
|
vm_map_wakeup(map);
|
|
}
|
|
vm_map_unlock(map);
|
|
}
|
|
|
|
void
|
|
kmem_init_zero_region(void)
|
|
{
|
|
vm_offset_t addr, i;
|
|
vm_page_t m;
|
|
|
|
/*
|
|
* Map a single physical page of zeros to a larger virtual range.
|
|
* This requires less looping in places that want large amounts of
|
|
* zeros, while not using much more physical resources.
|
|
*/
|
|
addr = kva_alloc(ZERO_REGION_SIZE);
|
|
m = vm_page_alloc_noobj(VM_ALLOC_WIRED | VM_ALLOC_ZERO);
|
|
for (i = 0; i < ZERO_REGION_SIZE; i += PAGE_SIZE)
|
|
pmap_qenter(addr + i, &m, 1);
|
|
pmap_protect(kernel_pmap, addr, addr + ZERO_REGION_SIZE, VM_PROT_READ);
|
|
|
|
zero_region = (const void *)addr;
|
|
}
|
|
|
|
/*
|
|
* Import KVA from the kernel map into the kernel arena.
|
|
*/
|
|
static int
|
|
kva_import(void *unused, vmem_size_t size, int flags, vmem_addr_t *addrp)
|
|
{
|
|
vm_offset_t addr;
|
|
int result;
|
|
|
|
TSENTER();
|
|
KASSERT((size % KVA_QUANTUM) == 0,
|
|
("kva_import: Size %jd is not a multiple of %d",
|
|
(intmax_t)size, (int)KVA_QUANTUM));
|
|
addr = vm_map_min(kernel_map);
|
|
result = vm_map_find(kernel_map, NULL, 0, &addr, size, 0,
|
|
VMFS_SUPER_SPACE, VM_PROT_ALL, VM_PROT_ALL, MAP_NOFAULT);
|
|
if (result != KERN_SUCCESS) {
|
|
TSEXIT();
|
|
return (ENOMEM);
|
|
}
|
|
|
|
*addrp = addr;
|
|
|
|
TSEXIT();
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Import KVA from a parent arena into a per-domain arena. Imports must be
|
|
* KVA_QUANTUM-aligned and a multiple of KVA_QUANTUM in size.
|
|
*/
|
|
static int
|
|
kva_import_domain(void *arena, vmem_size_t size, int flags, vmem_addr_t *addrp)
|
|
{
|
|
|
|
KASSERT((size % KVA_QUANTUM) == 0,
|
|
("kva_import_domain: Size %jd is not a multiple of %d",
|
|
(intmax_t)size, (int)KVA_QUANTUM));
|
|
return (vmem_xalloc(arena, size, KVA_QUANTUM, 0, 0, VMEM_ADDR_MIN,
|
|
VMEM_ADDR_MAX, flags, addrp));
|
|
}
|
|
|
|
/*
|
|
* kmem_init:
|
|
*
|
|
* Create the kernel map; insert a mapping covering kernel text,
|
|
* data, bss, and all space allocated thus far (`boostrap' data). The
|
|
* new map will thus map the range between VM_MIN_KERNEL_ADDRESS and
|
|
* `start' as allocated, and the range between `start' and `end' as free.
|
|
* Create the kernel vmem arena and its per-domain children.
|
|
*/
|
|
void
|
|
kmem_init(vm_offset_t start, vm_offset_t end)
|
|
{
|
|
vm_size_t quantum;
|
|
int domain;
|
|
|
|
vm_map_init(kernel_map, kernel_pmap, VM_MIN_KERNEL_ADDRESS, end);
|
|
kernel_map->system_map = 1;
|
|
vm_map_lock(kernel_map);
|
|
/* N.B.: cannot use kgdb to debug, starting with this assignment ... */
|
|
(void)vm_map_insert(kernel_map, NULL, 0,
|
|
#ifdef __amd64__
|
|
KERNBASE,
|
|
#else
|
|
VM_MIN_KERNEL_ADDRESS,
|
|
#endif
|
|
start, VM_PROT_ALL, VM_PROT_ALL, MAP_NOFAULT);
|
|
/* ... and ending with the completion of the above `insert' */
|
|
|
|
#ifdef __amd64__
|
|
/*
|
|
* Mark KVA used for the page array as allocated. Other platforms
|
|
* that handle vm_page_array allocation can simply adjust virtual_avail
|
|
* instead.
|
|
*/
|
|
(void)vm_map_insert(kernel_map, NULL, 0, (vm_offset_t)vm_page_array,
|
|
(vm_offset_t)vm_page_array + round_2mpage(vm_page_array_size *
|
|
sizeof(struct vm_page)),
|
|
VM_PROT_RW, VM_PROT_RW, MAP_NOFAULT);
|
|
#endif
|
|
vm_map_unlock(kernel_map);
|
|
|
|
/*
|
|
* Use a large import quantum on NUMA systems. This helps minimize
|
|
* interleaving of superpages, reducing internal fragmentation within
|
|
* the per-domain arenas.
|
|
*/
|
|
if (vm_ndomains > 1 && PMAP_HAS_DMAP)
|
|
quantum = KVA_NUMA_IMPORT_QUANTUM;
|
|
else
|
|
quantum = KVA_QUANTUM;
|
|
|
|
/*
|
|
* Initialize the kernel_arena. This can grow on demand.
|
|
*/
|
|
vmem_init(kernel_arena, "kernel arena", 0, 0, PAGE_SIZE, 0, 0);
|
|
vmem_set_import(kernel_arena, kva_import, NULL, NULL, quantum);
|
|
|
|
for (domain = 0; domain < vm_ndomains; domain++) {
|
|
/*
|
|
* Initialize the per-domain arenas. These are used to color
|
|
* the KVA space in a way that ensures that virtual large pages
|
|
* are backed by memory from the same physical domain,
|
|
* maximizing the potential for superpage promotion.
|
|
*/
|
|
vm_dom[domain].vmd_kernel_arena = vmem_create(
|
|
"kernel arena domain", 0, 0, PAGE_SIZE, 0, M_WAITOK);
|
|
vmem_set_import(vm_dom[domain].vmd_kernel_arena,
|
|
kva_import_domain, NULL, kernel_arena, quantum);
|
|
|
|
/*
|
|
* In architectures with superpages, maintain separate arenas
|
|
* for allocations with permissions that differ from the
|
|
* "standard" read/write permissions used for kernel memory,
|
|
* so as not to inhibit superpage promotion.
|
|
*
|
|
* Use the base import quantum since this arena is rarely used.
|
|
*/
|
|
#if VM_NRESERVLEVEL > 0
|
|
vm_dom[domain].vmd_kernel_rwx_arena = vmem_create(
|
|
"kernel rwx arena domain", 0, 0, PAGE_SIZE, 0, M_WAITOK);
|
|
vmem_set_import(vm_dom[domain].vmd_kernel_rwx_arena,
|
|
kva_import_domain, (vmem_release_t *)vmem_xfree,
|
|
kernel_arena, KVA_QUANTUM);
|
|
#else
|
|
vm_dom[domain].vmd_kernel_rwx_arena =
|
|
vm_dom[domain].vmd_kernel_arena;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* This must be the very first call so that the virtual address
|
|
* space used for early allocations is properly marked used in
|
|
* the map.
|
|
*/
|
|
uma_startup2();
|
|
}
|
|
|
|
/*
|
|
* kmem_bootstrap_free:
|
|
*
|
|
* Free pages backing preloaded data (e.g., kernel modules) to the
|
|
* system. Currently only supported on platforms that create a
|
|
* vm_phys segment for preloaded data.
|
|
*/
|
|
void
|
|
kmem_bootstrap_free(vm_offset_t start, vm_size_t size)
|
|
{
|
|
#if defined(__i386__) || defined(__amd64__)
|
|
struct vm_domain *vmd;
|
|
vm_offset_t end, va;
|
|
vm_paddr_t pa;
|
|
vm_page_t m;
|
|
|
|
end = trunc_page(start + size);
|
|
start = round_page(start);
|
|
|
|
#ifdef __amd64__
|
|
/*
|
|
* Preloaded files do not have execute permissions by default on amd64.
|
|
* Restore the default permissions to ensure that the direct map alias
|
|
* is updated.
|
|
*/
|
|
pmap_change_prot(start, end - start, VM_PROT_RW);
|
|
#endif
|
|
for (va = start; va < end; va += PAGE_SIZE) {
|
|
pa = pmap_kextract(va);
|
|
m = PHYS_TO_VM_PAGE(pa);
|
|
|
|
vmd = vm_pagequeue_domain(m);
|
|
vm_domain_free_lock(vmd);
|
|
vm_phys_free_pages(m, 0);
|
|
vm_domain_free_unlock(vmd);
|
|
|
|
vm_domain_freecnt_inc(vmd, 1);
|
|
vm_cnt.v_page_count++;
|
|
}
|
|
pmap_remove(kernel_pmap, start, end);
|
|
(void)vmem_add(kernel_arena, start, end - start, M_WAITOK);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Allow userspace to directly trigger the VM drain routine for testing
|
|
* purposes.
|
|
*/
|
|
static int
|
|
debug_vm_lowmem(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i;
|
|
|
|
i = 0;
|
|
error = sysctl_handle_int(oidp, &i, 0, req);
|
|
if (error != 0)
|
|
return (error);
|
|
if ((i & ~(VM_LOW_KMEM | VM_LOW_PAGES)) != 0)
|
|
return (EINVAL);
|
|
if (i != 0)
|
|
EVENTHANDLER_INVOKE(vm_lowmem, i);
|
|
return (0);
|
|
}
|
|
SYSCTL_PROC(_debug, OID_AUTO, vm_lowmem,
|
|
CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, 0, debug_vm_lowmem, "I",
|
|
"set to trigger vm_lowmem event with given flags");
|
|
|
|
static int
|
|
debug_uma_reclaim(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i;
|
|
|
|
i = 0;
|
|
error = sysctl_handle_int(oidp, &i, 0, req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
if (i != UMA_RECLAIM_TRIM && i != UMA_RECLAIM_DRAIN &&
|
|
i != UMA_RECLAIM_DRAIN_CPU)
|
|
return (EINVAL);
|
|
uma_reclaim(i);
|
|
return (0);
|
|
}
|
|
SYSCTL_PROC(_debug, OID_AUTO, uma_reclaim,
|
|
CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, 0, debug_uma_reclaim, "I",
|
|
"set to generate request to reclaim uma caches");
|
|
|
|
static int
|
|
debug_uma_reclaim_domain(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int domain, error, request;
|
|
|
|
request = 0;
|
|
error = sysctl_handle_int(oidp, &request, 0, req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
return (error);
|
|
|
|
domain = request >> 4;
|
|
request &= 0xf;
|
|
if (request != UMA_RECLAIM_TRIM && request != UMA_RECLAIM_DRAIN &&
|
|
request != UMA_RECLAIM_DRAIN_CPU)
|
|
return (EINVAL);
|
|
if (domain < 0 || domain >= vm_ndomains)
|
|
return (EINVAL);
|
|
uma_reclaim_domain(request, domain);
|
|
return (0);
|
|
}
|
|
SYSCTL_PROC(_debug, OID_AUTO, uma_reclaim_domain,
|
|
CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, 0,
|
|
debug_uma_reclaim_domain, "I",
|
|
"");
|