xref: /freebsd/sys/amd64/vmm/vmm_mem.c (revision 76aeda8ad4e2c1ae78bf1388a5d6e793d84d8c53)
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