1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 NetApp, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/malloc.h> 33 #include <sys/sglist.h> 34 #include <sys/lock.h> 35 #include <sys/rwlock.h> 36 37 #include <vm/vm.h> 38 #include <vm/vm_param.h> 39 #include <vm/pmap.h> 40 #include <vm/vm_map.h> 41 #include <vm/vm_object.h> 42 #include <vm/vm_page.h> 43 #include <vm/vm_pager.h> 44 45 #include <machine/md_var.h> 46 47 #include "vmm_mem.h" 48 49 int 50 vmm_mem_init(void) 51 { 52 53 return (0); 54 } 55 56 vm_object_t 57 vmm_mmio_alloc(struct vmspace *vmspace, vm_paddr_t gpa, size_t len, 58 vm_paddr_t hpa) 59 { 60 int error; 61 vm_object_t obj; 62 struct sglist *sg; 63 64 sg = sglist_alloc(1, M_WAITOK); 65 error = sglist_append_phys(sg, hpa, len); 66 KASSERT(error == 0, ("error %d appending physaddr to sglist", error)); 67 68 obj = vm_pager_allocate(OBJT_SG, sg, len, VM_PROT_RW, 0, NULL); 69 if (obj != NULL) { 70 /* 71 * VT-x ignores the MTRR settings when figuring out the 72 * memory type for translations obtained through EPT. 73 * 74 * Therefore we explicitly force the pages provided by 75 * this object to be mapped as uncacheable. 76 */ 77 VM_OBJECT_WLOCK(obj); 78 error = vm_object_set_memattr(obj, VM_MEMATTR_UNCACHEABLE); 79 VM_OBJECT_WUNLOCK(obj); 80 if (error != KERN_SUCCESS) { 81 panic("vmm_mmio_alloc: vm_object_set_memattr error %d", 82 error); 83 } 84 error = vm_map_find(&vmspace->vm_map, obj, 0, &gpa, len, 0, 85 VMFS_NO_SPACE, VM_PROT_RW, VM_PROT_RW, 0); 86 if (error != KERN_SUCCESS) { 87 vm_object_deallocate(obj); 88 obj = NULL; 89 } 90 } 91 92 /* 93 * Drop the reference on the sglist. 94 * 95 * If the scatter/gather object was successfully allocated then it 96 * has incremented the reference count on the sglist. Dropping the 97 * initial reference count ensures that the sglist will be freed 98 * when the object is deallocated. 99 * 100 * If the object could not be allocated then we end up freeing the 101 * sglist. 102 */ 103 sglist_free(sg); 104 105 return (obj); 106 } 107 108 void 109 vmm_mmio_free(struct vmspace *vmspace, vm_paddr_t gpa, size_t len) 110 { 111 112 vm_map_remove(&vmspace->vm_map, gpa, gpa + len); 113 } 114 115 vm_paddr_t 116 vmm_mem_maxaddr(void) 117 { 118 119 return (ptoa(Maxmem)); 120 } 121