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/param.h> 30 #include <sys/systm.h> 31 #include <sys/malloc.h> 32 #include <sys/sglist.h> 33 #include <sys/lock.h> 34 #include <sys/rwlock.h> 35 36 #include <vm/vm.h> 37 #include <vm/vm_param.h> 38 #include <vm/pmap.h> 39 #include <vm/vm_map.h> 40 #include <vm/vm_object.h> 41 #include <vm/vm_page.h> 42 #include <vm/vm_pager.h> 43 44 #include <machine/md_var.h> 45 46 #include "vmm_mem.h" 47 48 int 49 vmm_mem_init(void) 50 { 51 52 return (0); 53 } 54 55 vm_object_t 56 vmm_mmio_alloc(struct vmspace *vmspace, vm_paddr_t gpa, size_t len, 57 vm_paddr_t hpa) 58 { 59 int error; 60 vm_object_t obj; 61 struct sglist *sg; 62 63 sg = sglist_alloc(1, M_WAITOK); 64 error = sglist_append_phys(sg, hpa, len); 65 KASSERT(error == 0, ("error %d appending physaddr to sglist", error)); 66 67 obj = vm_pager_allocate(OBJT_SG, sg, len, VM_PROT_RW, 0, NULL); 68 if (obj != NULL) { 69 /* 70 * VT-x ignores the MTRR settings when figuring out the 71 * memory type for translations obtained through EPT. 72 * 73 * Therefore we explicitly force the pages provided by 74 * this object to be mapped as uncacheable. 75 */ 76 VM_OBJECT_WLOCK(obj); 77 error = vm_object_set_memattr(obj, VM_MEMATTR_UNCACHEABLE); 78 VM_OBJECT_WUNLOCK(obj); 79 if (error != KERN_SUCCESS) { 80 panic("vmm_mmio_alloc: vm_object_set_memattr error %d", 81 error); 82 } 83 error = vm_map_find(&vmspace->vm_map, obj, 0, &gpa, len, 0, 84 VMFS_NO_SPACE, VM_PROT_RW, VM_PROT_RW, 0); 85 if (error != KERN_SUCCESS) { 86 vm_object_deallocate(obj); 87 obj = NULL; 88 } 89 } 90 91 /* 92 * Drop the reference on the sglist. 93 * 94 * If the scatter/gather object was successfully allocated then it 95 * has incremented the reference count on the sglist. Dropping the 96 * initial reference count ensures that the sglist will be freed 97 * when the object is deallocated. 98 * 99 * If the object could not be allocated then we end up freeing the 100 * sglist. 101 */ 102 sglist_free(sg); 103 104 return (obj); 105 } 106 107 void 108 vmm_mmio_free(struct vmspace *vmspace, vm_paddr_t gpa, size_t len) 109 { 110 111 vm_map_remove(&vmspace->vm_map, gpa, gpa + len); 112 } 113 114 vm_paddr_t 115 vmm_mem_maxaddr(void) 116 { 117 118 return (ptoa(Maxmem)); 119 } 120