1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #pragma ident "%Z%%M% %I% %E% SMI"
27
28 #include <sys/debug.h>
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/time.h>
32 #include <sys/buf.h>
33 #include <sys/errno.h>
34 #include <sys/systm.h>
35 #include <sys/conf.h>
36 #include <sys/signal.h>
37 #include <vm/page.h>
38 #include <vm/as.h>
39 #include <vm/hat.h>
40 #include <vm/seg.h>
41 #include <vm/seg_dev.h>
42 #include <vm/hat_i86.h>
43 #include <sys/ddi.h>
44 #include <sys/devops.h>
45 #include <sys/sunddi.h>
46 #include <sys/ddi_impldefs.h>
47 #include <sys/fs/snode.h>
48 #include <sys/pci.h>
49 #include <sys/vmsystm.h>
50 #include "gfx_private.h"
51
52 /*
53 * clone of ddi_segmap_setup(). Respects the requested cache
54 * attributes so hat_devload() gives user space WC and
55 * UC mappings for system memory.
56 */
57
58 /*ARGSUSED*/
59 int
gfxp_ddi_segmap_setup(dev_t dev,off_t offset,struct as * as,caddr_t * addrp,off_t len,uint_t prot,uint_t maxprot,uint_t flags,cred_t * cred,ddi_device_acc_attr_t * accattrp,uint_t rnumber)60 gfxp_ddi_segmap_setup(dev_t dev, off_t offset, struct as *as, caddr_t *addrp,
61 off_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cred,
62 ddi_device_acc_attr_t *accattrp, uint_t rnumber)
63 {
64 struct segdev_crargs dev_a;
65 int (*mapfunc)(dev_t dev, off_t off, int prot);
66 uint_t hat_attr;
67 pfn_t pfn;
68 int error, i;
69
70 if ((mapfunc = devopsp[getmajor(dev)]->devo_cb_ops->cb_mmap) == nodev)
71 return (ENODEV);
72
73 /*
74 * Character devices that support the d_mmap
75 * interface can only be mmap'ed shared.
76 */
77 if ((flags & MAP_TYPE) != MAP_SHARED)
78 return (EINVAL);
79
80 /*
81 * Check that this region is indeed mappable on this platform.
82 * Use the mapping function.
83 */
84 if (ddi_device_mapping_check(dev, accattrp, rnumber, &hat_attr) == -1)
85 return (ENXIO);
86
87 if (accattrp != NULL) {
88 switch (accattrp->devacc_attr_dataorder) {
89 case DDI_STRICTORDER_ACC:
90 /* Want UC */
91 hat_attr &= ~HAT_ORDER_MASK;
92 hat_attr |= (HAT_STRICTORDER | HAT_PLAT_NOCACHE);
93 break;
94 case DDI_MERGING_OK_ACC:
95 /* Want WC */
96 hat_attr &= ~HAT_ORDER_MASK;
97 hat_attr |= (HAT_MERGING_OK | HAT_PLAT_NOCACHE);
98 break;
99 }
100 }
101
102 /*
103 * Check to ensure that the entire range is
104 * legal and we are not trying to map in
105 * more than the device will let us.
106 */
107 for (i = 0; i < len; i += PAGESIZE) {
108 if (i == 0) {
109 /*
110 * Save the pfn at offset here. This pfn will be
111 * used later to get user address.
112 */
113 if ((pfn = (pfn_t)cdev_mmap(mapfunc, dev, offset,
114 maxprot)) == PFN_INVALID)
115 return (ENXIO);
116 } else {
117 if (cdev_mmap(mapfunc, dev, offset + i, maxprot) ==
118 PFN_INVALID)
119 return (ENXIO);
120 }
121 }
122
123 as_rangelock(as);
124 if ((flags & MAP_FIXED) == 0) {
125 /*
126 * Pick an address w/o worrying about
127 * any vac alignment constraints.
128 */
129 map_addr(addrp, len, ptob(pfn), 0, flags);
130 if (*addrp == NULL) {
131 as_rangeunlock(as);
132 return (ENOMEM);
133 }
134 } else {
135 /*
136 * User-specified address; blow away any previous mappings.
137 */
138 (void) as_unmap(as, *addrp, len);
139 }
140
141 dev_a.mapfunc = mapfunc;
142 dev_a.dev = dev;
143 dev_a.offset = (offset_t)offset;
144 dev_a.type = flags & MAP_TYPE;
145 dev_a.prot = (uchar_t)prot;
146 dev_a.maxprot = (uchar_t)maxprot;
147 dev_a.hat_attr = hat_attr;
148 #if DEBUG
149 dev_a.hat_flags = 0;
150 #else
151 dev_a.hat_flags = HAT_LOAD_LOCK;
152 #endif
153 dev_a.devmap_data = NULL;
154
155 error = as_map(as, *addrp, len, segdev_create, &dev_a);
156 as_rangeunlock(as);
157
158 return (error);
159 }
160