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- /*-
- * SPDX-License-Identifier: (BSD-3-Clause AND MIT-CMU)
- *
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * The Mach Operating System project at Carnegie-Mellon University.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *
- * Copyright (c) 1987, 1990 Carnegie-Mellon University.
- * All rights reserved.
- *
- * Authors: Avadis Tevanian, Jr., Michael Wayne Young
- *
- * Permission to use, copy, modify and distribute this software and
- * its documentation is hereby granted, provided that both the copyright
- * notice and this permission notice appear in all copies of the
- * software, derivative works or modified versions, and any portions
- * thereof, and that both notices appear in supporting documentation.
- *
- * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
- * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
- * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
- * Carnegie Mellon requests users of this software to return to
- *
- * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
- * School of Computer Science
- * Carnegie Mellon University
- * Pittsburgh PA 15213-3890
- *
- * any improvements or extensions that they make and grant Carnegie the
- * rights to redistribute these changes.
- */
- /*
- * Kernel memory management.
- */
- #include <sys/cdefs.h>
- #include "opt_vm.h"
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/asan.h>
- #include <sys/domainset.h>
- #include <sys/eventhandler.h>
- #include <sys/kernel.h>
- #include <sys/lock.h>
- #include <sys/malloc.h>
- #include <sys/msan.h>
- #include <sys/proc.h>
- #include <sys/rwlock.h>
- #include <sys/smp.h>
- #include <sys/sysctl.h>
- #include <sys/vmem.h>
- #include <sys/vmmeter.h>
- #include <vm/vm.h>
- #include <vm/vm_param.h>
- #include <vm/vm_domainset.h>
- #include <vm/vm_kern.h>
- #include <vm/pmap.h>
- #include <vm/vm_map.h>
- #include <vm/vm_object.h>
- #include <vm/vm_page.h>
- #include <vm/vm_pageout.h>
- #include <vm/vm_pagequeue.h>
- #include <vm/vm_phys.h>
- #include <vm/vm_radix.h>
- #include <vm/vm_extern.h>
- #include <vm/uma.h>
- struct vm_map kernel_map_store;
- struct vm_map exec_map_store;
- struct vm_map pipe_map_store;
- const void *zero_region;
- CTASSERT((ZERO_REGION_SIZE & PAGE_MASK) == 0);
- /* NB: Used by kernel debuggers. */
- const u_long vm_maxuser_address = VM_MAXUSER_ADDRESS;
- u_int exec_map_entry_size;
- u_int exec_map_entries;
- SYSCTL_ULONG(_vm, OID_AUTO, min_kernel_address, CTLFLAG_RD,
- SYSCTL_NULL_ULONG_PTR, VM_MIN_KERNEL_ADDRESS, "Min kernel address");
- SYSCTL_ULONG(_vm, OID_AUTO, max_kernel_address, CTLFLAG_RD,
- #if defined(__arm__)
- &vm_max_kernel_address, 0,
- #else
- SYSCTL_NULL_ULONG_PTR, VM_MAX_KERNEL_ADDRESS,
- #endif
- "Max kernel address");
- #if VM_NRESERVLEVEL > 1
- #define KVA_QUANTUM_SHIFT (VM_LEVEL_1_ORDER + VM_LEVEL_0_ORDER + \
- PAGE_SHIFT)
- #elif VM_NRESERVLEVEL > 0
- #define KVA_QUANTUM_SHIFT (VM_LEVEL_0_ORDER + PAGE_SHIFT)
- #else
- /* On non-superpage architectures we want large import sizes. */
- #define KVA_QUANTUM_SHIFT (8 + PAGE_SHIFT)
- #endif
- #define KVA_QUANTUM (1ul << KVA_QUANTUM_SHIFT)
- #define KVA_NUMA_IMPORT_QUANTUM (KVA_QUANTUM * 128)
- extern void uma_startup2(void);
- /*
- * kva_alloc:
- *
- * Allocate a virtual address range with no underlying object and
- * no initial mapping to physical memory. Any mapping from this
- * range to physical memory must be explicitly created prior to
- * its use, typically with pmap_qenter(). Any attempt to create
- * a mapping on demand through vm_fault() will result in a panic.
- */
- vm_offset_t
- kva_alloc(vm_size_t size)
- {
- vm_offset_t addr;
- TSENTER();
- size = round_page(size);
- if (vmem_xalloc(kernel_arena, size, 0, 0, 0, VMEM_ADDR_MIN,
- VMEM_ADDR_MAX, M_BESTFIT | M_NOWAIT, &addr))
- return (0);
- TSEXIT();
- return (addr);
- }
- /*
- * kva_alloc_aligned:
- *
- * Allocate a virtual address range as in kva_alloc where the base
- * address is aligned to align.
- */
- vm_offset_t
- kva_alloc_aligned(vm_size_t size, vm_size_t align)
- {
- vm_offset_t addr;
- TSENTER();
- size = round_page(size);
- if (vmem_xalloc(kernel_arena, size, align, 0, 0, VMEM_ADDR_MIN,
- VMEM_ADDR_MAX, M_BESTFIT | M_NOWAIT, &addr))
- return (0);
- TSEXIT();
- return (addr);
- }
- /*
- * kva_free:
- *
- * Release a region of kernel virtual memory allocated
- * with kva_alloc, and return the physical pages
- * associated with that region.
- *
- * This routine may not block on kernel maps.
- */
- void
- kva_free(vm_offset_t addr, vm_size_t size)
- {
- size = round_page(size);
- vmem_xfree(kernel_arena, addr, size);
- }
- /*
- * Update sanitizer shadow state to reflect a new allocation. Force inlining to
- * help make KMSAN origin tracking more precise.
- */
- static __always_inline void
- kmem_alloc_san(vm_offset_t addr, vm_size_t size, vm_size_t asize, int flags)
- {
- if ((flags & M_ZERO) == 0) {
- kmsan_mark((void *)addr, asize, KMSAN_STATE_UNINIT);
- kmsan_orig((void *)addr, asize, KMSAN_TYPE_KMEM,
- KMSAN_RET_ADDR);
- } else {
- kmsan_mark((void *)addr, asize, KMSAN_STATE_INITED);
- }
- kasan_mark((void *)addr, size, asize, KASAN_KMEM_REDZONE);
- }
- static vm_page_t
- kmem_alloc_contig_pages(vm_object_t object, vm_pindex_t pindex, int domain,
- int pflags, u_long npages, vm_paddr_t low, vm_paddr_t high,
- u_long alignment, vm_paddr_t boundary, vm_memattr_t memattr)
- {
- vm_page_t m;
- int tries;
- bool wait, reclaim;
- VM_OBJECT_ASSERT_WLOCKED(object);
- wait = (pflags & VM_ALLOC_WAITOK) != 0;
- reclaim = (pflags & VM_ALLOC_NORECLAIM) == 0;
- pflags &= ~(VM_ALLOC_NOWAIT | VM_ALLOC_WAITOK | VM_ALLOC_WAITFAIL);
- pflags |= VM_ALLOC_NOWAIT;
- for (tries = wait ? 3 : 1;; tries--) {
- m = vm_page_alloc_contig_domain(object, pindex, domain, pflags,
- npages, low, high, alignment, boundary, memattr);
- if (m != NULL || tries == 0 || !reclaim)
- break;
- VM_OBJECT_WUNLOCK(object);
- if (vm_page_reclaim_contig_domain(domain, pflags, npages,
- low, high, alignment, boundary) == ENOMEM && wait)
- vm_wait_domain(domain);
- VM_OBJECT_WLOCK(object);
- }
- return (m);
- }
- /*
- * Allocates a region from the kernel address map and physical pages
- * within the specified address range to the kernel object. Creates a
- * wired mapping from this region to these pages, and returns the
- * region's starting virtual address. The allocated pages are not
- * necessarily physically contiguous. If M_ZERO is specified through the
- * given flags, then the pages are zeroed before they are mapped.
- */
- static void *
- kmem_alloc_attr_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
- vm_paddr_t high, vm_memattr_t memattr)
- {
- vmem_t *vmem;
- vm_object_t object;
- vm_offset_t addr, i, offset;
- vm_page_t m;
- vm_size_t asize;
- int pflags;
- vm_prot_t prot;
- object = kernel_object;
- asize = round_page(size);
- vmem = vm_dom[domain].vmd_kernel_arena;
- if (vmem_alloc(vmem, asize, M_BESTFIT | flags, &addr))
- return (0);
- offset = addr - VM_MIN_KERNEL_ADDRESS;
- pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
- prot = (flags & M_EXEC) != 0 ? VM_PROT_ALL : VM_PROT_RW;
- VM_OBJECT_WLOCK(object);
- for (i = 0; i < asize; i += PAGE_SIZE) {
- m = kmem_alloc_contig_pages(object, atop(offset + i),
- domain, pflags, 1, low, high, PAGE_SIZE, 0, memattr);
- if (m == NULL) {
- VM_OBJECT_WUNLOCK(object);
- kmem_unback(object, addr, i);
- vmem_free(vmem, addr, asize);
- return (0);
- }
- KASSERT(vm_page_domain(m) == domain,
- ("kmem_alloc_attr_domain: Domain mismatch %d != %d",
- vm_page_domain(m), domain));
- if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
- pmap_zero_page(m);
- vm_page_valid(m);
- pmap_enter(kernel_pmap, addr + i, m, prot,
- prot | PMAP_ENTER_WIRED, 0);
- }
- VM_OBJECT_WUNLOCK(object);
- kmem_alloc_san(addr, size, asize, flags);
- return ((void *)addr);
- }
- void *
- kmem_alloc_attr(vm_size_t size, int flags, vm_paddr_t low, vm_paddr_t high,
- vm_memattr_t memattr)
- {
- return (kmem_alloc_attr_domainset(DOMAINSET_RR(), size, flags, low,
- high, memattr));
- }
- void *
- kmem_alloc_attr_domainset(struct domainset *ds, vm_size_t size, int flags,
- vm_paddr_t low, vm_paddr_t high, vm_memattr_t memattr)
- {
- struct vm_domainset_iter di;
- vm_page_t bounds[2];
- void *addr;
- int domain;
- int start_segind;
- start_segind = -1;
- vm_domainset_iter_policy_init(&di, ds, &domain, &flags);
- do {
- addr = kmem_alloc_attr_domain(domain, size, flags, low, high,
- memattr);
- if (addr != NULL)
- break;
- if (start_segind == -1)
- start_segind = vm_phys_lookup_segind(low);
- if (vm_phys_find_range(bounds, start_segind, domain,
- atop(round_page(size)), low, high) == -1) {
- vm_domainset_iter_ignore(&di, domain);
- }
- } while (vm_domainset_iter_policy(&di, &domain) == 0);
- return (addr);
- }
- /*
- * Allocates a region from the kernel address map and physically
- * contiguous pages within the specified address range to the kernel
- * object. Creates a wired mapping from this region to these pages, and
- * returns the region's starting virtual address. If M_ZERO is specified
- * through the given flags, then the pages are zeroed before they are
- * mapped.
- */
- static void *
- kmem_alloc_contig_domain(int domain, vm_size_t size, int flags, vm_paddr_t low,
- vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
- vm_memattr_t memattr)
- {
- vmem_t *vmem;
- vm_object_t object;
- vm_offset_t addr, offset, tmp;
- vm_page_t end_m, m;
- vm_size_t asize;
- u_long npages;
- int pflags;
- object = kernel_object;
- asize = round_page(size);
- vmem = vm_dom[domain].vmd_kernel_arena;
- if (vmem_alloc(vmem, asize, flags | M_BESTFIT, &addr))
- return (NULL);
- offset = addr - VM_MIN_KERNEL_ADDRESS;
- pflags = malloc2vm_flags(flags) | VM_ALLOC_WIRED;
- npages = atop(asize);
- VM_OBJECT_WLOCK(object);
- m = kmem_alloc_contig_pages(object, atop(offset), domain,
- pflags, npages, low, high, alignment, boundary, memattr);
- if (m == NULL) {
- VM_OBJECT_WUNLOCK(object);
- vmem_free(vmem, addr, asize);
- return (NULL);
- }
- KASSERT(vm_page_domain(m) == domain,
- ("kmem_alloc_contig_domain: Domain mismatch %d != %d",
- vm_page_domain(m), domain));
- end_m = m + npages;
- tmp = addr;
- for (; m < end_m; m++) {
- if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
- pmap_zero_page(m);
- vm_page_valid(m);
- pmap_enter(kernel_pmap, tmp, m, VM_PROT_RW,
- VM_PROT_RW | PMAP_ENTER_WIRED, 0);
- tmp += PAGE_SIZE;
- }
- VM_OBJECT_WUNLOCK(object);
- kmem_alloc_san(addr, size, asize, flags);
- return ((void *)addr);
- }
- void *
- kmem_alloc_contig(vm_size_t size, int flags, vm_paddr_t low, vm_paddr_t high,
- u_long alignment, vm_paddr_t boundary, vm_memattr_t memattr)
- {
- return (kmem_alloc_contig_domainset(DOMAINSET_RR(), size, flags, low,
- high, alignment, boundary, memattr));
- }
- void *
- kmem_alloc_contig_domainset(struct domainset *ds, vm_size_t size, int flags,
- vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
- vm_memattr_t memattr)
- {
- struct vm_domainset_iter di;
- vm_page_t bounds[2];
- void *addr;
- int domain;
- int start_segind;
- start_segind = -1;
- vm_domainset_iter_policy_init(&di, ds, &domain, &flags);
- do {
- addr = kmem_alloc_contig_domain(domain, size, flags, low, high,
- alignment, boundary, memattr);
- if (addr != NULL)
- break;
- if (start_segind == -1)
- start_segind = vm_phys_lookup_segind(low);
- if (vm_phys_find_range(bounds, start_segind, domain,
- atop(round_page(size)), low, high) == -1) {
- vm_domainset_iter_ignore(&di, domain);
- }
- } while (vm_domainset_iter_policy(&di, &domain) == 0);
- return (addr);
- }
- /*
- * kmem_subinit:
- *
- * Initializes a map to manage a subrange
- * of the kernel virtual address space.
- *
- * Arguments are as follows:
- *
- * parent Map to take range from
- * min, max Returned endpoints of map
- * size Size of range to find
- * superpage_align Request that min is superpage aligned
- */
- void
- kmem_subinit(vm_map_t map, vm_map_t parent, vm_offset_t *min, vm_offset_t *max,
- vm_size_t size, bool superpage_align)
- {
- int ret;
- size = round_page(size);
- *min = vm_map_min(parent);
- ret = vm_map_find(parent, NULL, 0, min, size, 0, superpage_align ?
- VMFS_SUPER_SPACE : VMFS_ANY_SPACE, VM_PROT_ALL, VM_PROT_ALL,
- MAP_ACC_NO_CHARGE);
- if (ret != KERN_SUCCESS)
- panic("kmem_subinit: bad status return of %d", ret);
- *max = *min + size;
- vm_map_init(map, vm_map_pmap(parent), *min, *max);
- if (vm_map_submap(parent, *min, *max, map) != KERN_SUCCESS)
- panic("kmem_subinit: unable to change range to submap");
- }
- /*
- * kmem_malloc_domain:
- *
- * Allocate wired-down pages in the kernel's address space.
- */
- static void *
- kmem_malloc_domain(int domain, vm_size_t size, int flags)
- {
- vmem_t *arena;
- vm_offset_t addr;
- vm_size_t asize;
- int rv;
- if (__predict_true((flags & M_EXEC) == 0))
- arena = vm_dom[domain].vmd_kernel_arena;
- else
- arena = vm_dom[domain].vmd_kernel_rwx_arena;
- asize = round_page(size);
- if (vmem_alloc(arena, asize, flags | M_BESTFIT, &addr))
- return (0);
- rv = kmem_back_domain(domain, kernel_object, addr, asize, flags);
- if (rv != KERN_SUCCESS) {
- vmem_free(arena, addr, asize);
- return (0);
- }
- kasan_mark((void *)addr, size, asize, KASAN_KMEM_REDZONE);
- return ((void *)addr);
- }
- void *
- kmem_malloc(vm_size_t size, int flags)
- {
- void * p;
- TSENTER();
- p = kmem_malloc_domainset(DOMAINSET_RR(), size, flags);
- TSEXIT();
- return (p);
- }
- void *
- kmem_malloc_domainset(struct domainset *ds, vm_size_t size, int flags)
- {
- struct vm_domainset_iter di;
- void *addr;
- int domain;
- vm_domainset_iter_policy_init(&di, ds, &domain, &flags);
- do {
- addr = kmem_malloc_domain(domain, size, flags);
- if (addr != NULL)
- break;
- } while (vm_domainset_iter_policy(&di, &domain) == 0);
- return (addr);
- }
- /*
- * kmem_back_domain:
- *
- * Allocate physical pages from the specified domain for the specified
- * virtual address range.
- */
- 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
- }
- #ifdef PMAP_WANT_ACTIVE_CPUS_NAIVE
- void
- pmap_active_cpus(pmap_t pmap, cpuset_t *res)
- {
- struct thread *td;
- struct proc *p;
- struct vmspace *vm;
- int c;
- CPU_ZERO(res);
- CPU_FOREACH(c) {
- td = cpuid_to_pcpu[c]->pc_curthread;
- p = td->td_proc;
- if (p == NULL)
- continue;
- vm = vmspace_acquire_ref(p);
- if (vm == NULL)
- continue;
- if (pmap == vmspace_pmap(vm))
- CPU_SET(c, res);
- vmspace_free(vm);
- }
- }
- #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",
- "");
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