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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/debug.h> 30 #include <sys/types.h> 31 #include <sys/param.h> 32 #include <sys/time.h> 33 #include <sys/buf.h> 34 #include <sys/errno.h> 35 #include <sys/systm.h> 36 #include <sys/conf.h> 37 #include <sys/signal.h> 38 #include <vm/page.h> 39 #include <vm/as.h> 40 #include <vm/hat.h> 41 #include <vm/seg.h> 42 #include <vm/seg_dev.h> 43 #include <vm/hat_i86.h> 44 #include <sys/ddi.h> 45 #include <sys/devops.h> 46 #include <sys/sunddi.h> 47 #include <sys/ddi_impldefs.h> 48 #include <sys/fs/snode.h> 49 #include <sys/pci.h> 50 #include <sys/vmsystm.h> 51 #include "gfx_private.h" 52 53 /* 54 * clone of ddi_segmap_setup(). Respects the requested cache 55 * attributes so hat_devload() gives user space WC and 56 * UC mappings for system memory. 57 */ 58 59 /*ARGSUSED*/ 60 int 61 gfxp_ddi_segmap_setup(dev_t dev, off_t offset, struct as *as, caddr_t *addrp, 62 off_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cred, 63 ddi_device_acc_attr_t *accattrp, uint_t rnumber) 64 { 65 struct segdev_crargs dev_a; 66 int (*mapfunc)(dev_t dev, off_t off, int prot); 67 uint_t hat_attr; 68 pfn_t pfn; 69 int error, i; 70 71 if ((mapfunc = devopsp[getmajor(dev)]->devo_cb_ops->cb_mmap) == nodev) 72 return (ENODEV); 73 74 /* 75 * Character devices that support the d_mmap 76 * interface can only be mmap'ed shared. 77 */ 78 if ((flags & MAP_TYPE) != MAP_SHARED) 79 return (EINVAL); 80 81 /* 82 * Check that this region is indeed mappable on this platform. 83 * Use the mapping function. 84 */ 85 if (ddi_device_mapping_check(dev, accattrp, rnumber, &hat_attr) == -1) 86 return (ENXIO); 87 88 if (accattrp != NULL) { 89 switch (accattrp->devacc_attr_dataorder) { 90 case DDI_STRICTORDER_ACC: 91 /* Want UC */ 92 hat_attr &= ~HAT_ORDER_MASK; 93 hat_attr |= (HAT_STRICTORDER | HAT_PLAT_NOCACHE); 94 break; 95 case DDI_MERGING_OK_ACC: 96 /* Want WC */ 97 hat_attr &= ~HAT_ORDER_MASK; 98 hat_attr |= (HAT_MERGING_OK | HAT_PLAT_NOCACHE); 99 break; 100 } 101 } 102 103 /* 104 * Check to ensure that the entire range is 105 * legal and we are not trying to map in 106 * more than the device will let us. 107 */ 108 for (i = 0; i < len; i += PAGESIZE) { 109 if (i == 0) { 110 /* 111 * Save the pfn at offset here. This pfn will be 112 * used later to get user address. 113 */ 114 if ((pfn = (pfn_t)cdev_mmap(mapfunc, dev, offset, 115 maxprot)) == PFN_INVALID) 116 return (ENXIO); 117 } else { 118 if (cdev_mmap(mapfunc, dev, offset + i, maxprot) == 119 PFN_INVALID) 120 return (ENXIO); 121 } 122 } 123 124 as_rangelock(as); 125 if ((flags & MAP_FIXED) == 0) { 126 /* 127 * Pick an address w/o worrying about 128 * any vac alignment constraints. 129 */ 130 map_addr(addrp, len, ptob(pfn), 0, flags); 131 if (*addrp == NULL) { 132 as_rangeunlock(as); 133 return (ENOMEM); 134 } 135 } else { 136 /* 137 * User-specified address; blow away any previous mappings. 138 */ 139 (void) as_unmap(as, *addrp, len); 140 } 141 142 dev_a.mapfunc = mapfunc; 143 dev_a.dev = dev; 144 dev_a.offset = (offset_t)offset; 145 dev_a.type = flags & MAP_TYPE; 146 dev_a.prot = (uchar_t)prot; 147 dev_a.maxprot = (uchar_t)maxprot; 148 dev_a.hat_attr = hat_attr; 149 dev_a.hat_flags = 0; 150 dev_a.devmap_data = NULL; 151 152 error = as_map(as, *addrp, len, segdev_create, &dev_a); 153 as_rangeunlock(as); 154 155 return (error); 156 } 157