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 #include <sys/debug.h> 27 #include <sys/types.h> 28 #include <sys/param.h> 29 #include <sys/time.h> 30 #include <sys/buf.h> 31 #include <sys/errno.h> 32 #include <sys/systm.h> 33 #include <sys/conf.h> 34 #include <sys/signal.h> 35 #include <vm/page.h> 36 #include <vm/as.h> 37 #include <vm/hat.h> 38 #include <vm/seg.h> 39 #include <vm/seg_dev.h> 40 #include <vm/hat_i86.h> 41 #include <sys/ddi.h> 42 #include <sys/devops.h> 43 #include <sys/sunddi.h> 44 #include <sys/ddi_impldefs.h> 45 #include <sys/fs/snode.h> 46 #include <sys/pci.h> 47 #include <sys/vmsystm.h> 48 #include <sys/gfx_private.h> 49 50 /* 51 * clone of ddi_segmap_setup(). Respects the requested cache 52 * attributes so hat_devload() gives user space WC and 53 * UC mappings for system memory. 54 */ 55 56 /*ARGSUSED*/ 57 int 58 gfxp_ddi_segmap_setup(dev_t dev, off_t offset, struct as *as, caddr_t *addrp, 59 off_t len, uint_t prot, uint_t maxprot, uint_t flags, cred_t *cred, 60 ddi_device_acc_attr_t *accattrp, uint_t rnumber) 61 { 62 struct segdev_crargs dev_a; 63 int (*mapfunc)(dev_t dev, off_t off, int prot); 64 uint_t hat_attr; 65 pfn_t pfn; 66 int error, i; 67 68 if ((mapfunc = devopsp[getmajor(dev)]->devo_cb_ops->cb_mmap) == nodev) 69 return (ENODEV); 70 71 /* 72 * Character devices that support the d_mmap 73 * interface can only be mmap'ed shared. 74 */ 75 if ((flags & MAP_TYPE) != MAP_SHARED) 76 return (EINVAL); 77 78 if (len == 0) 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 /* 109 * Save the pfn at offset here. This pfn will be 110 * used later to get user address. 111 */ 112 pfn = (pfn_t)cdev_mmap(mapfunc, dev, offset, maxprot); 113 if (pfn == PFN_INVALID) 114 return (ENXIO); 115 for (i = PAGESIZE; i < len; i += PAGESIZE) { 116 if (cdev_mmap(mapfunc, dev, offset + i, maxprot) == PFN_INVALID) 117 return (ENXIO); 118 } 119 120 as_rangelock(as); 121 if ((flags & MAP_FIXED) == 0) { 122 /* 123 * Pick an address w/o worrying about 124 * any vac alignment constraints. 125 */ 126 map_addr(addrp, len, ptob(pfn), 0, flags); 127 if (*addrp == NULL) { 128 as_rangeunlock(as); 129 return (ENOMEM); 130 } 131 } else { 132 /* 133 * User-specified address; blow away any previous mappings. 134 */ 135 (void) as_unmap(as, *addrp, len); 136 } 137 138 dev_a.mapfunc = mapfunc; 139 dev_a.dev = dev; 140 dev_a.offset = (offset_t)offset; 141 dev_a.type = flags & MAP_TYPE; 142 dev_a.prot = (uchar_t)prot; 143 dev_a.maxprot = (uchar_t)maxprot; 144 dev_a.hat_attr = hat_attr; 145 #if DEBUG 146 dev_a.hat_flags = 0; 147 #else 148 dev_a.hat_flags = HAT_LOAD_LOCK; 149 #endif 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