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
vmm_mmio_alloc(struct vmspace * vmspace,vm_paddr_t gpa,size_t len,vm_paddr_t hpa)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
vmm_mmio_free(struct vmspace * vmspace,vm_paddr_t gpa,size_t len)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
vmm_mem_maxaddr(void)108 vmm_mem_maxaddr(void)
109 {
110
111 return (ptoa(Maxmem));
112 }
113