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