Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 1 | /* memregion_direct.c |
| 2 | * |
Benjamin Romer | f6d0c1e | 2014-04-23 14:58:34 -0400 | [diff] [blame] | 3 | * Copyright (C) 2010 - 2013 UNISYS CORPORATION |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or (at |
| 9 | * your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 14 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 15 | * details. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * This is an implementation of memory regions that can be used to read/write |
| 20 | * channel memory (in main memory of the host system) from code running in |
| 21 | * a virtual partition. |
| 22 | */ |
| 23 | #include "uniklog.h" |
| 24 | #include "timskmod.h" |
| 25 | #include "memregion.h" |
| 26 | |
| 27 | #define MYDRVNAME "memregion" |
| 28 | |
| 29 | struct MEMREGION_Tag { |
| 30 | HOSTADDRESS physaddr; |
| 31 | ulong nbytes; |
Ken Cox | 3db5540 | 2014-05-22 12:31:09 -0500 | [diff] [blame] | 32 | void __iomem *mapped; |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 33 | BOOL requested; |
| 34 | BOOL overlapped; |
| 35 | }; |
| 36 | |
| 37 | static BOOL mapit(MEMREGION *memregion); |
| 38 | static void unmapit(MEMREGION *memregion); |
| 39 | |
| 40 | MEMREGION * |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 41 | visor_memregion_create(HOSTADDRESS physaddr, ulong nbytes) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 42 | { |
| 43 | MEMREGION *rc = NULL; |
Silvio F | a3acc83 | 2014-03-18 22:13:10 +0100 | [diff] [blame] | 44 | MEMREGION *memregion = kzalloc(sizeof(MEMREGION), |
| 45 | GFP_KERNEL | __GFP_NORETRY); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 46 | if (memregion == NULL) { |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 47 | ERRDRV("visor_memregion_create allocation failed"); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 48 | return NULL; |
| 49 | } |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 50 | memregion->physaddr = physaddr; |
| 51 | memregion->nbytes = nbytes; |
| 52 | memregion->overlapped = FALSE; |
Ken Cox | d9355f8 | 2014-03-19 13:06:22 -0500 | [diff] [blame] | 53 | if (!mapit(memregion)) { |
| 54 | rc = NULL; |
| 55 | goto Away; |
| 56 | } |
| 57 | rc = memregion; |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 58 | Away: |
| 59 | if (rc == NULL) { |
| 60 | if (memregion != NULL) { |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 61 | visor_memregion_destroy(memregion); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 62 | memregion = NULL; |
| 63 | } |
| 64 | } |
| 65 | return rc; |
| 66 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 67 | EXPORT_SYMBOL_GPL(visor_memregion_create); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 68 | |
| 69 | MEMREGION * |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 70 | visor_memregion_create_overlapped(MEMREGION *parent, ulong offset, ulong nbytes) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 71 | { |
| 72 | MEMREGION *memregion = NULL; |
| 73 | |
| 74 | if (parent == NULL) { |
| 75 | ERRDRV("%s parent is NULL", __func__); |
| 76 | return NULL; |
| 77 | } |
| 78 | if (parent->mapped == NULL) { |
| 79 | ERRDRV("%s parent is not mapped!", __func__); |
| 80 | return NULL; |
| 81 | } |
| 82 | if ((offset >= parent->nbytes) || |
| 83 | ((offset + nbytes) >= parent->nbytes)) { |
| 84 | ERRDRV("%s range (%lu,%lu) out of parent range", |
| 85 | __func__, offset, nbytes); |
| 86 | return NULL; |
| 87 | } |
Andreea-Cristina Bernat | 97a84f1 | 2014-03-14 04:20:06 +0200 | [diff] [blame] | 88 | memregion = kzalloc(sizeof(MEMREGION), GFP_KERNEL|__GFP_NORETRY); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 89 | if (memregion == NULL) { |
| 90 | ERRDRV("%s allocation failed", __func__); |
| 91 | return NULL; |
| 92 | } |
Andreea-Cristina Bernat | 97a84f1 | 2014-03-14 04:20:06 +0200 | [diff] [blame] | 93 | |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 94 | memregion->physaddr = parent->physaddr + offset; |
| 95 | memregion->nbytes = nbytes; |
Ken Cox | 3db5540 | 2014-05-22 12:31:09 -0500 | [diff] [blame] | 96 | memregion->mapped = ((u8 __iomem *) (parent->mapped)) + offset; |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 97 | memregion->requested = FALSE; |
| 98 | memregion->overlapped = TRUE; |
| 99 | return memregion; |
| 100 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 101 | EXPORT_SYMBOL_GPL(visor_memregion_create_overlapped); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 102 | |
| 103 | |
| 104 | static BOOL |
| 105 | mapit(MEMREGION *memregion) |
| 106 | { |
| 107 | ulong physaddr = (ulong) (memregion->physaddr); |
| 108 | ulong nbytes = memregion->nbytes; |
| 109 | |
| 110 | memregion->requested = FALSE; |
| 111 | if (!request_mem_region(physaddr, nbytes, MYDRVNAME)) |
| 112 | ERRDRV("cannot reserve channel memory @0x%lx for 0x%lx-- no big deal", physaddr, nbytes); |
| 113 | else |
| 114 | memregion->requested = TRUE; |
| 115 | memregion->mapped = ioremap_cache(physaddr, nbytes); |
| 116 | if (memregion->mapped == NULL) { |
| 117 | ERRDRV("cannot ioremap_cache channel memory @0x%lx for 0x%lx", |
| 118 | physaddr, nbytes); |
| 119 | return FALSE; |
| 120 | } |
| 121 | return TRUE; |
| 122 | } |
| 123 | |
| 124 | static void |
| 125 | unmapit(MEMREGION *memregion) |
| 126 | { |
| 127 | if (memregion->mapped != NULL) { |
| 128 | iounmap(memregion->mapped); |
| 129 | memregion->mapped = NULL; |
| 130 | } |
| 131 | if (memregion->requested) { |
| 132 | release_mem_region((ulong) (memregion->physaddr), |
| 133 | memregion->nbytes); |
| 134 | memregion->requested = FALSE; |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | HOSTADDRESS |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 139 | visor_memregion_get_physaddr(MEMREGION *memregion) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 140 | { |
| 141 | return memregion->physaddr; |
| 142 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 143 | EXPORT_SYMBOL_GPL(visor_memregion_get_physaddr); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 144 | |
| 145 | ulong |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 146 | visor_memregion_get_nbytes(MEMREGION *memregion) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 147 | { |
| 148 | return memregion->nbytes; |
| 149 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 150 | EXPORT_SYMBOL_GPL(visor_memregion_get_nbytes); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 151 | |
Ken Cox | 3db5540 | 2014-05-22 12:31:09 -0500 | [diff] [blame] | 152 | void __iomem * |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 153 | visor_memregion_get_pointer(MEMREGION *memregion) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 154 | { |
| 155 | return memregion->mapped; |
| 156 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 157 | EXPORT_SYMBOL_GPL(visor_memregion_get_pointer); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 158 | |
| 159 | int |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 160 | visor_memregion_resize(MEMREGION *memregion, ulong newsize) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 161 | { |
| 162 | if (newsize == memregion->nbytes) |
| 163 | return 0; |
| 164 | if (memregion->overlapped) |
| 165 | /* no error check here - we no longer know the |
| 166 | * parent's range! |
| 167 | */ |
| 168 | memregion->nbytes = newsize; |
| 169 | else { |
| 170 | unmapit(memregion); |
| 171 | memregion->nbytes = newsize; |
| 172 | if (!mapit(memregion)) |
| 173 | return -1; |
| 174 | } |
| 175 | return 0; |
| 176 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 177 | EXPORT_SYMBOL_GPL(visor_memregion_resize); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 178 | |
| 179 | |
| 180 | static int |
| 181 | memregion_readwrite(BOOL is_write, |
| 182 | MEMREGION *memregion, ulong offset, |
| 183 | void *local, ulong nbytes) |
| 184 | { |
| 185 | if (offset + nbytes > memregion->nbytes) { |
| 186 | ERRDRV("memregion_readwrite offset out of range!!"); |
Benjamin Romer | 66e24b7 | 2014-07-25 13:55:10 -0400 | [diff] [blame^] | 187 | return -EIO; |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 188 | } |
| 189 | if (is_write) |
| 190 | memcpy_toio(memregion->mapped + offset, local, nbytes); |
| 191 | else |
| 192 | memcpy_fromio(local, memregion->mapped + offset, nbytes); |
| 193 | |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | int |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 198 | visor_memregion_read(MEMREGION *memregion, ulong offset, void *dest, |
| 199 | ulong nbytes) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 200 | { |
| 201 | return memregion_readwrite(FALSE, memregion, offset, dest, nbytes); |
| 202 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 203 | EXPORT_SYMBOL_GPL(visor_memregion_read); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 204 | |
| 205 | int |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 206 | visor_memregion_write(MEMREGION *memregion, ulong offset, void *src, |
| 207 | ulong nbytes) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 208 | { |
| 209 | return memregion_readwrite(TRUE, memregion, offset, src, nbytes); |
| 210 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 211 | EXPORT_SYMBOL_GPL(visor_memregion_write); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 212 | |
| 213 | void |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 214 | visor_memregion_destroy(MEMREGION *memregion) |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 215 | { |
| 216 | if (memregion == NULL) |
| 217 | return; |
| 218 | if (!memregion->overlapped) |
| 219 | unmapit(memregion); |
| 220 | kfree(memregion); |
| 221 | } |
Ken Cox | 927c792 | 2014-03-05 14:52:25 -0600 | [diff] [blame] | 222 | EXPORT_SYMBOL_GPL(visor_memregion_destroy); |
Ken Cox | 9d9baad | 2014-03-04 07:58:05 -0600 | [diff] [blame] | 223 | |