1 /*- 2 * Copyright (c) 2011 NetApp, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 #include <sys/sglist.h> 36 #include <sys/lock.h> 37 #include <sys/rwlock.h> 38 39 #include <vm/vm.h> 40 #include <vm/vm_param.h> 41 #include <vm/pmap.h> 42 #include <vm/vm_map.h> 43 #include <vm/vm_object.h> 44 #include <vm/vm_page.h> 45 #include <vm/vm_pager.h> 46 47 #include <machine/md_var.h> 48 49 #include "vmm_mem.h" 50 51 int 52 vmm_mem_init(void) 53 { 54 55 return (0); 56 } 57 58 vm_object_t 59 vmm_mmio_alloc(struct vmspace *vmspace, vm_paddr_t gpa, size_t len, 60 vm_paddr_t hpa) 61 { 62 int error; 63 vm_object_t obj; 64 struct sglist *sg; 65 66 sg = sglist_alloc(1, M_WAITOK); 67 error = sglist_append_phys(sg, hpa, len); 68 KASSERT(error == 0, ("error %d appending physaddr to sglist", error)); 69 70 obj = vm_pager_allocate(OBJT_SG, sg, len, VM_PROT_RW, 0, NULL); 71 if (obj != NULL) { 72 /* 73 * VT-x ignores the MTRR settings when figuring out the 74 * memory type for translations obtained through EPT. 75 * 76 * Therefore we explicitly force the pages provided by 77 * this object to be mapped as uncacheable. 78 */ 79 VM_OBJECT_WLOCK(obj); 80 error = vm_object_set_memattr(obj, VM_MEMATTR_UNCACHEABLE); 81 VM_OBJECT_WUNLOCK(obj); 82 if (error != KERN_SUCCESS) { 83 panic("vmm_mmio_alloc: vm_object_set_memattr error %d", 84 error); 85 } 86 error = vm_map_find(&vmspace->vm_map, obj, 0, &gpa, len, 0, 87 VMFS_NO_SPACE, VM_PROT_RW, VM_PROT_RW, 0); 88 if (error != KERN_SUCCESS) { 89 vm_object_deallocate(obj); 90 obj = NULL; 91 } 92 } 93 94 /* 95 * Drop the reference on the sglist. 96 * 97 * If the scatter/gather object was successfully allocated then it 98 * has incremented the reference count on the sglist. Dropping the 99 * initial reference count ensures that the sglist will be freed 100 * when the object is deallocated. 101 * 102 * If the object could not be allocated then we end up freeing the 103 * sglist. 104 */ 105 sglist_free(sg); 106 107 return (obj); 108 } 109 110 void 111 vmm_mmio_free(struct vmspace *vmspace, vm_paddr_t gpa, size_t len) 112 { 113 114 vm_map_remove(&vmspace->vm_map, gpa, gpa + len); 115 } 116 117 vm_paddr_t 118 vmm_mem_maxaddr(void) 119 { 120 121 return (ptoa(Maxmem)); 122 } 123