Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IBM PowerPC Virtual I/O Infrastructure Support. |
| 3 | * |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 4 | * Copyright (c) 2003,2008 IBM Corp. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Dave Engebretsen engebret@us.ibm.com |
| 6 | * Santiago Leon santil@us.ibm.com |
| 7 | * Hollis Blanchard <hollisb@us.ibm.com> |
Stephen Rothwell | 19dbd0f | 2005-07-12 17:50:26 +1000 | [diff] [blame] | 8 | * Stephen Rothwell |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 9 | * Robert Jennings <rcjenn@us.ibm.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License |
| 13 | * as published by the Free Software Foundation; either version |
| 14 | * 2 of the License, or (at your option) any later version. |
| 15 | */ |
| 16 | |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 17 | #include <linux/types.h> |
Paul Gortmaker | b56eade | 2011-05-27 13:27:45 -0400 | [diff] [blame] | 18 | #include <linux/stat.h> |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 19 | #include <linux/device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/console.h> |
Paul Gortmaker | 4b16f8e | 2011-07-22 18:24:23 -0400 | [diff] [blame^] | 23 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/mm.h> |
| 25 | #include <linux/dma-mapping.h> |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 26 | #include <linux/kobject.h> |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/iommu.h> |
| 29 | #include <asm/dma.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/vio.h> |
Olaf Hering | 143dcec | 2005-11-08 21:34:36 -0800 | [diff] [blame] | 31 | #include <asm/prom.h> |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 32 | #include <asm/firmware.h> |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 33 | #include <asm/tce.h> |
| 34 | #include <asm/abs_addr.h> |
| 35 | #include <asm/page.h> |
| 36 | #include <asm/hvcall.h> |
| 37 | #include <asm/iseries/vio.h> |
| 38 | #include <asm/iseries/hv_types.h> |
| 39 | #include <asm/iseries/hv_lp_config.h> |
| 40 | #include <asm/iseries/hv_call_xm.h> |
| 41 | #include <asm/iseries/iommu.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Stephen Rothwell | 6fccab2 | 2007-09-21 14:32:05 +1000 | [diff] [blame] | 43 | static struct bus_type vio_bus_type; |
| 44 | |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 45 | static struct vio_dev vio_bus_device = { /* fake "parent" device */ |
Kay Sievers | aab0d37 | 2008-12-04 10:02:56 -0800 | [diff] [blame] | 46 | .name = "vio", |
Stephen Rothwell | ac5b33c | 2005-06-21 17:15:54 -0700 | [diff] [blame] | 47 | .type = "", |
Kay Sievers | aab0d37 | 2008-12-04 10:02:56 -0800 | [diff] [blame] | 48 | .dev.init_name = "vio", |
Stephen Rothwell | ac5b33c | 2005-06-21 17:15:54 -0700 | [diff] [blame] | 49 | .dev.bus = &vio_bus_type, |
| 50 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 52 | #ifdef CONFIG_PPC_SMLPAR |
| 53 | /** |
| 54 | * vio_cmo_pool - A pool of IO memory for CMO use |
| 55 | * |
| 56 | * @size: The size of the pool in bytes |
| 57 | * @free: The amount of free memory in the pool |
| 58 | */ |
| 59 | struct vio_cmo_pool { |
| 60 | size_t size; |
| 61 | size_t free; |
| 62 | }; |
| 63 | |
| 64 | /* How many ms to delay queued balance work */ |
| 65 | #define VIO_CMO_BALANCE_DELAY 100 |
| 66 | |
| 67 | /* Portion out IO memory to CMO devices by this chunk size */ |
| 68 | #define VIO_CMO_BALANCE_CHUNK 131072 |
| 69 | |
| 70 | /** |
| 71 | * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement |
| 72 | * |
| 73 | * @vio_dev: struct vio_dev pointer |
| 74 | * @list: pointer to other devices on bus that are being tracked |
| 75 | */ |
| 76 | struct vio_cmo_dev_entry { |
| 77 | struct vio_dev *viodev; |
| 78 | struct list_head list; |
| 79 | }; |
| 80 | |
| 81 | /** |
| 82 | * vio_cmo - VIO bus accounting structure for CMO entitlement |
| 83 | * |
| 84 | * @lock: spinlock for entire structure |
| 85 | * @balance_q: work queue for balancing system entitlement |
| 86 | * @device_list: list of CMO-enabled devices requiring entitlement |
| 87 | * @entitled: total system entitlement in bytes |
| 88 | * @reserve: pool of memory from which devices reserve entitlement, incl. spare |
| 89 | * @excess: pool of excess entitlement not needed for device reserves or spare |
| 90 | * @spare: IO memory for device hotplug functionality |
| 91 | * @min: minimum necessary for system operation |
| 92 | * @desired: desired memory for system operation |
| 93 | * @curr: bytes currently allocated |
| 94 | * @high: high water mark for IO data usage |
| 95 | */ |
| 96 | struct vio_cmo { |
| 97 | spinlock_t lock; |
| 98 | struct delayed_work balance_q; |
| 99 | struct list_head device_list; |
| 100 | size_t entitled; |
| 101 | struct vio_cmo_pool reserve; |
| 102 | struct vio_cmo_pool excess; |
| 103 | size_t spare; |
| 104 | size_t min; |
| 105 | size_t desired; |
| 106 | size_t curr; |
| 107 | size_t high; |
| 108 | } vio_cmo; |
| 109 | |
| 110 | /** |
| 111 | * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows |
| 112 | */ |
| 113 | static int vio_cmo_num_OF_devs(void) |
| 114 | { |
| 115 | struct device_node *node_vroot; |
| 116 | int count = 0; |
| 117 | |
| 118 | /* |
| 119 | * Count the number of vdevice entries with an |
| 120 | * ibm,my-dma-window OF property |
| 121 | */ |
| 122 | node_vroot = of_find_node_by_name(NULL, "vdevice"); |
| 123 | if (node_vroot) { |
| 124 | struct device_node *of_node; |
| 125 | struct property *prop; |
| 126 | |
| 127 | for_each_child_of_node(node_vroot, of_node) { |
| 128 | prop = of_find_property(of_node, "ibm,my-dma-window", |
| 129 | NULL); |
| 130 | if (prop) |
| 131 | count++; |
| 132 | } |
| 133 | } |
| 134 | of_node_put(node_vroot); |
| 135 | return count; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * vio_cmo_alloc - allocate IO memory for CMO-enable devices |
| 140 | * |
| 141 | * @viodev: VIO device requesting IO memory |
| 142 | * @size: size of allocation requested |
| 143 | * |
| 144 | * Allocations come from memory reserved for the devices and any excess |
| 145 | * IO memory available to all devices. The spare pool used to service |
| 146 | * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be |
| 147 | * made available. |
| 148 | * |
| 149 | * Return codes: |
| 150 | * 0 for successful allocation and -ENOMEM for a failure |
| 151 | */ |
| 152 | static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size) |
| 153 | { |
| 154 | unsigned long flags; |
| 155 | size_t reserve_free = 0; |
| 156 | size_t excess_free = 0; |
| 157 | int ret = -ENOMEM; |
| 158 | |
| 159 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 160 | |
| 161 | /* Determine the amount of free entitlement available in reserve */ |
| 162 | if (viodev->cmo.entitled > viodev->cmo.allocated) |
| 163 | reserve_free = viodev->cmo.entitled - viodev->cmo.allocated; |
| 164 | |
| 165 | /* If spare is not fulfilled, the excess pool can not be used. */ |
| 166 | if (vio_cmo.spare >= VIO_CMO_MIN_ENT) |
| 167 | excess_free = vio_cmo.excess.free; |
| 168 | |
| 169 | /* The request can be satisfied */ |
| 170 | if ((reserve_free + excess_free) >= size) { |
| 171 | vio_cmo.curr += size; |
| 172 | if (vio_cmo.curr > vio_cmo.high) |
| 173 | vio_cmo.high = vio_cmo.curr; |
| 174 | viodev->cmo.allocated += size; |
| 175 | size -= min(reserve_free, size); |
| 176 | vio_cmo.excess.free -= size; |
| 177 | ret = 0; |
| 178 | } |
| 179 | |
| 180 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices |
| 186 | * @viodev: VIO device freeing IO memory |
| 187 | * @size: size of deallocation |
| 188 | * |
| 189 | * IO memory is freed by the device back to the correct memory pools. |
| 190 | * The spare pool is replenished first from either memory pool, then |
| 191 | * the reserve pool is used to reduce device entitlement, the excess |
| 192 | * pool is used to increase the reserve pool toward the desired entitlement |
| 193 | * target, and then the remaining memory is returned to the pools. |
| 194 | * |
| 195 | */ |
| 196 | static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size) |
| 197 | { |
| 198 | unsigned long flags; |
| 199 | size_t spare_needed = 0; |
| 200 | size_t excess_freed = 0; |
| 201 | size_t reserve_freed = size; |
| 202 | size_t tmp; |
| 203 | int balance = 0; |
| 204 | |
| 205 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 206 | vio_cmo.curr -= size; |
| 207 | |
| 208 | /* Amount of memory freed from the excess pool */ |
| 209 | if (viodev->cmo.allocated > viodev->cmo.entitled) { |
| 210 | excess_freed = min(reserve_freed, (viodev->cmo.allocated - |
| 211 | viodev->cmo.entitled)); |
| 212 | reserve_freed -= excess_freed; |
| 213 | } |
| 214 | |
| 215 | /* Remove allocation from device */ |
| 216 | viodev->cmo.allocated -= (reserve_freed + excess_freed); |
| 217 | |
| 218 | /* Spare is a subset of the reserve pool, replenish it first. */ |
| 219 | spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare; |
| 220 | |
| 221 | /* |
| 222 | * Replenish the spare in the reserve pool from the excess pool. |
| 223 | * This moves entitlement into the reserve pool. |
| 224 | */ |
| 225 | if (spare_needed && excess_freed) { |
| 226 | tmp = min(excess_freed, spare_needed); |
| 227 | vio_cmo.excess.size -= tmp; |
| 228 | vio_cmo.reserve.size += tmp; |
| 229 | vio_cmo.spare += tmp; |
| 230 | excess_freed -= tmp; |
| 231 | spare_needed -= tmp; |
| 232 | balance = 1; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * Replenish the spare in the reserve pool from the reserve pool. |
| 237 | * This removes entitlement from the device down to VIO_CMO_MIN_ENT, |
| 238 | * if needed, and gives it to the spare pool. The amount of used |
| 239 | * memory in this pool does not change. |
| 240 | */ |
| 241 | if (spare_needed && reserve_freed) { |
Hagen Paul Pfeifer | 732eacc | 2010-10-26 14:22:23 -0700 | [diff] [blame] | 242 | tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT)); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 243 | |
| 244 | vio_cmo.spare += tmp; |
| 245 | viodev->cmo.entitled -= tmp; |
| 246 | reserve_freed -= tmp; |
| 247 | spare_needed -= tmp; |
| 248 | balance = 1; |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * Increase the reserve pool until the desired allocation is met. |
| 253 | * Move an allocation freed from the excess pool into the reserve |
| 254 | * pool and schedule a balance operation. |
| 255 | */ |
| 256 | if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) { |
| 257 | tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size)); |
| 258 | |
| 259 | vio_cmo.excess.size -= tmp; |
| 260 | vio_cmo.reserve.size += tmp; |
| 261 | excess_freed -= tmp; |
| 262 | balance = 1; |
| 263 | } |
| 264 | |
| 265 | /* Return memory from the excess pool to that pool */ |
| 266 | if (excess_freed) |
| 267 | vio_cmo.excess.free += excess_freed; |
| 268 | |
| 269 | if (balance) |
| 270 | schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY); |
| 271 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * vio_cmo_entitlement_update - Manage system entitlement changes |
| 276 | * |
| 277 | * @new_entitlement: new system entitlement to attempt to accommodate |
| 278 | * |
| 279 | * Increases in entitlement will be used to fulfill the spare entitlement |
| 280 | * and the rest is given to the excess pool. Decreases, if they are |
| 281 | * possible, come from the excess pool and from unused device entitlement |
| 282 | * |
| 283 | * Returns: 0 on success, -ENOMEM when change can not be made |
| 284 | */ |
| 285 | int vio_cmo_entitlement_update(size_t new_entitlement) |
| 286 | { |
| 287 | struct vio_dev *viodev; |
| 288 | struct vio_cmo_dev_entry *dev_ent; |
| 289 | unsigned long flags; |
| 290 | size_t avail, delta, tmp; |
| 291 | |
| 292 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 293 | |
| 294 | /* Entitlement increases */ |
| 295 | if (new_entitlement > vio_cmo.entitled) { |
| 296 | delta = new_entitlement - vio_cmo.entitled; |
| 297 | |
| 298 | /* Fulfill spare allocation */ |
| 299 | if (vio_cmo.spare < VIO_CMO_MIN_ENT) { |
| 300 | tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare)); |
| 301 | vio_cmo.spare += tmp; |
| 302 | vio_cmo.reserve.size += tmp; |
| 303 | delta -= tmp; |
| 304 | } |
| 305 | |
| 306 | /* Remaining new allocation goes to the excess pool */ |
| 307 | vio_cmo.entitled += delta; |
| 308 | vio_cmo.excess.size += delta; |
| 309 | vio_cmo.excess.free += delta; |
| 310 | |
| 311 | goto out; |
| 312 | } |
| 313 | |
| 314 | /* Entitlement decreases */ |
| 315 | delta = vio_cmo.entitled - new_entitlement; |
| 316 | avail = vio_cmo.excess.free; |
| 317 | |
| 318 | /* |
| 319 | * Need to check how much unused entitlement each device can |
| 320 | * sacrifice to fulfill entitlement change. |
| 321 | */ |
| 322 | list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { |
| 323 | if (avail >= delta) |
| 324 | break; |
| 325 | |
| 326 | viodev = dev_ent->viodev; |
| 327 | if ((viodev->cmo.entitled > viodev->cmo.allocated) && |
| 328 | (viodev->cmo.entitled > VIO_CMO_MIN_ENT)) |
| 329 | avail += viodev->cmo.entitled - |
| 330 | max_t(size_t, viodev->cmo.allocated, |
| 331 | VIO_CMO_MIN_ENT); |
| 332 | } |
| 333 | |
| 334 | if (delta <= avail) { |
| 335 | vio_cmo.entitled -= delta; |
| 336 | |
| 337 | /* Take entitlement from the excess pool first */ |
| 338 | tmp = min(vio_cmo.excess.free, delta); |
| 339 | vio_cmo.excess.size -= tmp; |
| 340 | vio_cmo.excess.free -= tmp; |
| 341 | delta -= tmp; |
| 342 | |
| 343 | /* |
| 344 | * Remove all but VIO_CMO_MIN_ENT bytes from devices |
| 345 | * until entitlement change is served |
| 346 | */ |
| 347 | list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { |
| 348 | if (!delta) |
| 349 | break; |
| 350 | |
| 351 | viodev = dev_ent->viodev; |
| 352 | tmp = 0; |
| 353 | if ((viodev->cmo.entitled > viodev->cmo.allocated) && |
| 354 | (viodev->cmo.entitled > VIO_CMO_MIN_ENT)) |
| 355 | tmp = viodev->cmo.entitled - |
| 356 | max_t(size_t, viodev->cmo.allocated, |
| 357 | VIO_CMO_MIN_ENT); |
| 358 | viodev->cmo.entitled -= min(tmp, delta); |
| 359 | delta -= min(tmp, delta); |
| 360 | } |
| 361 | } else { |
| 362 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 363 | return -ENOMEM; |
| 364 | } |
| 365 | |
| 366 | out: |
| 367 | schedule_delayed_work(&vio_cmo.balance_q, 0); |
| 368 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | /** |
| 373 | * vio_cmo_balance - Balance entitlement among devices |
| 374 | * |
| 375 | * @work: work queue structure for this operation |
| 376 | * |
| 377 | * Any system entitlement above the minimum needed for devices, or |
| 378 | * already allocated to devices, can be distributed to the devices. |
| 379 | * The list of devices is iterated through to recalculate the desired |
| 380 | * entitlement level and to determine how much entitlement above the |
| 381 | * minimum entitlement is allocated to devices. |
| 382 | * |
| 383 | * Small chunks of the available entitlement are given to devices until |
| 384 | * their requirements are fulfilled or there is no entitlement left to give. |
| 385 | * Upon completion sizes of the reserve and excess pools are calculated. |
| 386 | * |
| 387 | * The system minimum entitlement level is also recalculated here. |
| 388 | * Entitlement will be reserved for devices even after vio_bus_remove to |
| 389 | * accommodate reloading the driver. The OF tree is walked to count the |
| 390 | * number of devices present and this will remove entitlement for devices |
| 391 | * that have actually left the system after having vio_bus_remove called. |
| 392 | */ |
| 393 | static void vio_cmo_balance(struct work_struct *work) |
| 394 | { |
| 395 | struct vio_cmo *cmo; |
| 396 | struct vio_dev *viodev; |
| 397 | struct vio_cmo_dev_entry *dev_ent; |
| 398 | unsigned long flags; |
| 399 | size_t avail = 0, level, chunk, need; |
| 400 | int devcount = 0, fulfilled; |
| 401 | |
| 402 | cmo = container_of(work, struct vio_cmo, balance_q.work); |
| 403 | |
| 404 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 405 | |
| 406 | /* Calculate minimum entitlement and fulfill spare */ |
| 407 | cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT; |
| 408 | BUG_ON(cmo->min > cmo->entitled); |
| 409 | cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min)); |
| 410 | cmo->min += cmo->spare; |
| 411 | cmo->desired = cmo->min; |
| 412 | |
| 413 | /* |
| 414 | * Determine how much entitlement is available and reset device |
| 415 | * entitlements |
| 416 | */ |
| 417 | avail = cmo->entitled - cmo->spare; |
| 418 | list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { |
| 419 | viodev = dev_ent->viodev; |
| 420 | devcount++; |
| 421 | viodev->cmo.entitled = VIO_CMO_MIN_ENT; |
| 422 | cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT); |
| 423 | avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT); |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Having provided each device with the minimum entitlement, loop |
| 428 | * over the devices portioning out the remaining entitlement |
| 429 | * until there is nothing left. |
| 430 | */ |
| 431 | level = VIO_CMO_MIN_ENT; |
| 432 | while (avail) { |
| 433 | fulfilled = 0; |
| 434 | list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { |
| 435 | viodev = dev_ent->viodev; |
| 436 | |
| 437 | if (viodev->cmo.desired <= level) { |
| 438 | fulfilled++; |
| 439 | continue; |
| 440 | } |
| 441 | |
| 442 | /* |
| 443 | * Give the device up to VIO_CMO_BALANCE_CHUNK |
| 444 | * bytes of entitlement, but do not exceed the |
| 445 | * desired level of entitlement for the device. |
| 446 | */ |
| 447 | chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK); |
| 448 | chunk = min(chunk, (viodev->cmo.desired - |
| 449 | viodev->cmo.entitled)); |
| 450 | viodev->cmo.entitled += chunk; |
| 451 | |
| 452 | /* |
| 453 | * If the memory for this entitlement increase was |
| 454 | * already allocated to the device it does not come |
| 455 | * from the available pool being portioned out. |
| 456 | */ |
| 457 | need = max(viodev->cmo.allocated, viodev->cmo.entitled)- |
| 458 | max(viodev->cmo.allocated, level); |
| 459 | avail -= need; |
| 460 | |
| 461 | } |
| 462 | if (fulfilled == devcount) |
| 463 | break; |
| 464 | level += VIO_CMO_BALANCE_CHUNK; |
| 465 | } |
| 466 | |
| 467 | /* Calculate new reserve and excess pool sizes */ |
| 468 | cmo->reserve.size = cmo->min; |
| 469 | cmo->excess.free = 0; |
| 470 | cmo->excess.size = 0; |
| 471 | need = 0; |
| 472 | list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { |
| 473 | viodev = dev_ent->viodev; |
| 474 | /* Calculated reserve size above the minimum entitlement */ |
| 475 | if (viodev->cmo.entitled) |
| 476 | cmo->reserve.size += (viodev->cmo.entitled - |
| 477 | VIO_CMO_MIN_ENT); |
| 478 | /* Calculated used excess entitlement */ |
| 479 | if (viodev->cmo.allocated > viodev->cmo.entitled) |
| 480 | need += viodev->cmo.allocated - viodev->cmo.entitled; |
| 481 | } |
| 482 | cmo->excess.size = cmo->entitled - cmo->reserve.size; |
| 483 | cmo->excess.free = cmo->excess.size - need; |
| 484 | |
Jean Delvare | bf6aede | 2009-04-02 16:56:54 -0700 | [diff] [blame] | 485 | cancel_delayed_work(to_delayed_work(work)); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 486 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 487 | } |
| 488 | |
| 489 | static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size, |
| 490 | dma_addr_t *dma_handle, gfp_t flag) |
| 491 | { |
| 492 | struct vio_dev *viodev = to_vio_dev(dev); |
| 493 | void *ret; |
| 494 | |
Robert Jennings | 69b052e | 2009-01-22 09:40:00 +0000 | [diff] [blame] | 495 | if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) { |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 496 | atomic_inc(&viodev->cmo.allocs_failed); |
| 497 | return NULL; |
| 498 | } |
| 499 | |
| 500 | ret = dma_iommu_ops.alloc_coherent(dev, size, dma_handle, flag); |
| 501 | if (unlikely(ret == NULL)) { |
Robert Jennings | 69b052e | 2009-01-22 09:40:00 +0000 | [diff] [blame] | 502 | vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE)); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 503 | atomic_inc(&viodev->cmo.allocs_failed); |
| 504 | } |
| 505 | |
| 506 | return ret; |
| 507 | } |
| 508 | |
| 509 | static void vio_dma_iommu_free_coherent(struct device *dev, size_t size, |
| 510 | void *vaddr, dma_addr_t dma_handle) |
| 511 | { |
| 512 | struct vio_dev *viodev = to_vio_dev(dev); |
| 513 | |
| 514 | dma_iommu_ops.free_coherent(dev, size, vaddr, dma_handle); |
| 515 | |
Robert Jennings | 69b052e | 2009-01-22 09:40:00 +0000 | [diff] [blame] | 516 | vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE)); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 517 | } |
| 518 | |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 519 | static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page, |
| 520 | unsigned long offset, size_t size, |
| 521 | enum dma_data_direction direction, |
| 522 | struct dma_attrs *attrs) |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 523 | { |
| 524 | struct vio_dev *viodev = to_vio_dev(dev); |
| 525 | dma_addr_t ret = DMA_ERROR_CODE; |
| 526 | |
| 527 | if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE))) { |
| 528 | atomic_inc(&viodev->cmo.allocs_failed); |
| 529 | return ret; |
| 530 | } |
| 531 | |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 532 | ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs); |
Stephen Rothwell | 0764bf6 | 2008-07-28 02:22:14 +1000 | [diff] [blame] | 533 | if (unlikely(dma_mapping_error(dev, ret))) { |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 534 | vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE)); |
| 535 | atomic_inc(&viodev->cmo.allocs_failed); |
| 536 | } |
| 537 | |
| 538 | return ret; |
| 539 | } |
| 540 | |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 541 | static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle, |
| 542 | size_t size, |
| 543 | enum dma_data_direction direction, |
| 544 | struct dma_attrs *attrs) |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 545 | { |
| 546 | struct vio_dev *viodev = to_vio_dev(dev); |
| 547 | |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 548 | dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 549 | |
| 550 | vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE)); |
| 551 | } |
| 552 | |
| 553 | static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, |
| 554 | int nelems, enum dma_data_direction direction, |
| 555 | struct dma_attrs *attrs) |
| 556 | { |
| 557 | struct vio_dev *viodev = to_vio_dev(dev); |
| 558 | struct scatterlist *sgl; |
| 559 | int ret, count = 0; |
| 560 | size_t alloc_size = 0; |
| 561 | |
| 562 | for (sgl = sglist; count < nelems; count++, sgl++) |
| 563 | alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE); |
| 564 | |
| 565 | if (vio_cmo_alloc(viodev, alloc_size)) { |
| 566 | atomic_inc(&viodev->cmo.allocs_failed); |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | ret = dma_iommu_ops.map_sg(dev, sglist, nelems, direction, attrs); |
| 571 | |
| 572 | if (unlikely(!ret)) { |
| 573 | vio_cmo_dealloc(viodev, alloc_size); |
| 574 | atomic_inc(&viodev->cmo.allocs_failed); |
Robert Jennings | 69b052e | 2009-01-22 09:40:00 +0000 | [diff] [blame] | 575 | return ret; |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | for (sgl = sglist, count = 0; count < ret; count++, sgl++) |
| 579 | alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE); |
| 580 | if (alloc_size) |
| 581 | vio_cmo_dealloc(viodev, alloc_size); |
| 582 | |
| 583 | return ret; |
| 584 | } |
| 585 | |
| 586 | static void vio_dma_iommu_unmap_sg(struct device *dev, |
| 587 | struct scatterlist *sglist, int nelems, |
| 588 | enum dma_data_direction direction, |
| 589 | struct dma_attrs *attrs) |
| 590 | { |
| 591 | struct vio_dev *viodev = to_vio_dev(dev); |
| 592 | struct scatterlist *sgl; |
| 593 | size_t alloc_size = 0; |
| 594 | int count = 0; |
| 595 | |
| 596 | for (sgl = sglist; count < nelems; count++, sgl++) |
| 597 | alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE); |
| 598 | |
| 599 | dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs); |
| 600 | |
| 601 | vio_cmo_dealloc(viodev, alloc_size); |
| 602 | } |
| 603 | |
Nishanth Aravamudan | 6d283d7 | 2010-10-18 07:26:59 +0000 | [diff] [blame] | 604 | static int vio_dma_iommu_dma_supported(struct device *dev, u64 mask) |
| 605 | { |
| 606 | return dma_iommu_ops.dma_supported(dev, mask); |
| 607 | } |
| 608 | |
FUJITA Tomonori | 45223c5 | 2009-08-04 19:08:25 +0000 | [diff] [blame] | 609 | struct dma_map_ops vio_dma_mapping_ops = { |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 610 | .alloc_coherent = vio_dma_iommu_alloc_coherent, |
| 611 | .free_coherent = vio_dma_iommu_free_coherent, |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 612 | .map_sg = vio_dma_iommu_map_sg, |
| 613 | .unmap_sg = vio_dma_iommu_unmap_sg, |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 614 | .map_page = vio_dma_iommu_map_page, |
| 615 | .unmap_page = vio_dma_iommu_unmap_page, |
Nishanth Aravamudan | 6d283d7 | 2010-10-18 07:26:59 +0000 | [diff] [blame] | 616 | .dma_supported = vio_dma_iommu_dma_supported, |
Mark Nelson | f9226d5 | 2008-10-27 20:38:08 +0000 | [diff] [blame] | 617 | |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 618 | }; |
| 619 | |
| 620 | /** |
| 621 | * vio_cmo_set_dev_desired - Set desired entitlement for a device |
| 622 | * |
| 623 | * @viodev: struct vio_dev for device to alter |
| 624 | * @new_desired: new desired entitlement level in bytes |
| 625 | * |
| 626 | * For use by devices to request a change to their entitlement at runtime or |
| 627 | * through sysfs. The desired entitlement level is changed and a balancing |
| 628 | * of system resources is scheduled to run in the future. |
| 629 | */ |
| 630 | void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) |
| 631 | { |
| 632 | unsigned long flags; |
| 633 | struct vio_cmo_dev_entry *dev_ent; |
| 634 | int found = 0; |
| 635 | |
| 636 | if (!firmware_has_feature(FW_FEATURE_CMO)) |
| 637 | return; |
| 638 | |
| 639 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 640 | if (desired < VIO_CMO_MIN_ENT) |
| 641 | desired = VIO_CMO_MIN_ENT; |
| 642 | |
| 643 | /* |
| 644 | * Changes will not be made for devices not in the device list. |
| 645 | * If it is not in the device list, then no driver is loaded |
| 646 | * for the device and it can not receive entitlement. |
| 647 | */ |
| 648 | list_for_each_entry(dev_ent, &vio_cmo.device_list, list) |
| 649 | if (viodev == dev_ent->viodev) { |
| 650 | found = 1; |
| 651 | break; |
| 652 | } |
Julia Lawall | f6d8c8b | 2010-03-29 05:33:34 +0000 | [diff] [blame] | 653 | if (!found) { |
| 654 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 655 | return; |
Julia Lawall | f6d8c8b | 2010-03-29 05:33:34 +0000 | [diff] [blame] | 656 | } |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 657 | |
| 658 | /* Increase/decrease in desired device entitlement */ |
| 659 | if (desired >= viodev->cmo.desired) { |
| 660 | /* Just bump the bus and device values prior to a balance*/ |
| 661 | vio_cmo.desired += desired - viodev->cmo.desired; |
| 662 | viodev->cmo.desired = desired; |
| 663 | } else { |
| 664 | /* Decrease bus and device values for desired entitlement */ |
| 665 | vio_cmo.desired -= viodev->cmo.desired - desired; |
| 666 | viodev->cmo.desired = desired; |
| 667 | /* |
| 668 | * If less entitlement is desired than current entitlement, move |
| 669 | * any reserve memory in the change region to the excess pool. |
| 670 | */ |
| 671 | if (viodev->cmo.entitled > desired) { |
| 672 | vio_cmo.reserve.size -= viodev->cmo.entitled - desired; |
| 673 | vio_cmo.excess.size += viodev->cmo.entitled - desired; |
| 674 | /* |
| 675 | * If entitlement moving from the reserve pool to the |
| 676 | * excess pool is currently unused, add to the excess |
| 677 | * free counter. |
| 678 | */ |
| 679 | if (viodev->cmo.allocated < viodev->cmo.entitled) |
| 680 | vio_cmo.excess.free += viodev->cmo.entitled - |
| 681 | max(viodev->cmo.allocated, desired); |
| 682 | viodev->cmo.entitled = desired; |
| 683 | } |
| 684 | } |
| 685 | schedule_delayed_work(&vio_cmo.balance_q, 0); |
| 686 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 687 | } |
| 688 | |
| 689 | /** |
| 690 | * vio_cmo_bus_probe - Handle CMO specific bus probe activities |
| 691 | * |
| 692 | * @viodev - Pointer to struct vio_dev for device |
| 693 | * |
| 694 | * Determine the devices IO memory entitlement needs, attempting |
| 695 | * to satisfy the system minimum entitlement at first and scheduling |
| 696 | * a balance operation to take care of the rest at a later time. |
| 697 | * |
| 698 | * Returns: 0 on success, -EINVAL when device doesn't support CMO, and |
| 699 | * -ENOMEM when entitlement is not available for device or |
| 700 | * device entry. |
| 701 | * |
| 702 | */ |
| 703 | static int vio_cmo_bus_probe(struct vio_dev *viodev) |
| 704 | { |
| 705 | struct vio_cmo_dev_entry *dev_ent; |
| 706 | struct device *dev = &viodev->dev; |
| 707 | struct vio_driver *viodrv = to_vio_driver(dev->driver); |
| 708 | unsigned long flags; |
| 709 | size_t size; |
| 710 | |
| 711 | /* |
| 712 | * Check to see that device has a DMA window and configure |
| 713 | * entitlement for the device. |
| 714 | */ |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 715 | if (of_get_property(viodev->dev.of_node, |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 716 | "ibm,my-dma-window", NULL)) { |
| 717 | /* Check that the driver is CMO enabled and get desired DMA */ |
| 718 | if (!viodrv->get_desired_dma) { |
| 719 | dev_err(dev, "%s: device driver does not support CMO\n", |
| 720 | __func__); |
| 721 | return -EINVAL; |
| 722 | } |
| 723 | |
| 724 | viodev->cmo.desired = IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev)); |
| 725 | if (viodev->cmo.desired < VIO_CMO_MIN_ENT) |
| 726 | viodev->cmo.desired = VIO_CMO_MIN_ENT; |
| 727 | size = VIO_CMO_MIN_ENT; |
| 728 | |
| 729 | dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry), |
| 730 | GFP_KERNEL); |
| 731 | if (!dev_ent) |
| 732 | return -ENOMEM; |
| 733 | |
| 734 | dev_ent->viodev = viodev; |
| 735 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 736 | list_add(&dev_ent->list, &vio_cmo.device_list); |
| 737 | } else { |
| 738 | viodev->cmo.desired = 0; |
| 739 | size = 0; |
| 740 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * If the needs for vio_cmo.min have not changed since they |
| 745 | * were last set, the number of devices in the OF tree has |
| 746 | * been constant and the IO memory for this is already in |
| 747 | * the reserve pool. |
| 748 | */ |
| 749 | if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) * |
| 750 | VIO_CMO_MIN_ENT)) { |
| 751 | /* Updated desired entitlement if device requires it */ |
| 752 | if (size) |
| 753 | vio_cmo.desired += (viodev->cmo.desired - |
| 754 | VIO_CMO_MIN_ENT); |
| 755 | } else { |
| 756 | size_t tmp; |
| 757 | |
| 758 | tmp = vio_cmo.spare + vio_cmo.excess.free; |
| 759 | if (tmp < size) { |
| 760 | dev_err(dev, "%s: insufficient free " |
| 761 | "entitlement to add device. " |
| 762 | "Need %lu, have %lu\n", __func__, |
| 763 | size, (vio_cmo.spare + tmp)); |
| 764 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 765 | return -ENOMEM; |
| 766 | } |
| 767 | |
| 768 | /* Use excess pool first to fulfill request */ |
| 769 | tmp = min(size, vio_cmo.excess.free); |
| 770 | vio_cmo.excess.free -= tmp; |
| 771 | vio_cmo.excess.size -= tmp; |
| 772 | vio_cmo.reserve.size += tmp; |
| 773 | |
| 774 | /* Use spare if excess pool was insufficient */ |
| 775 | vio_cmo.spare -= size - tmp; |
| 776 | |
| 777 | /* Update bus accounting */ |
| 778 | vio_cmo.min += size; |
| 779 | vio_cmo.desired += viodev->cmo.desired; |
| 780 | } |
| 781 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 782 | return 0; |
| 783 | } |
| 784 | |
| 785 | /** |
| 786 | * vio_cmo_bus_remove - Handle CMO specific bus removal activities |
| 787 | * |
| 788 | * @viodev - Pointer to struct vio_dev for device |
| 789 | * |
| 790 | * Remove the device from the cmo device list. The minimum entitlement |
| 791 | * will be reserved for the device as long as it is in the system. The |
| 792 | * rest of the entitlement the device had been allocated will be returned |
| 793 | * to the system. |
| 794 | */ |
| 795 | static void vio_cmo_bus_remove(struct vio_dev *viodev) |
| 796 | { |
| 797 | struct vio_cmo_dev_entry *dev_ent; |
| 798 | unsigned long flags; |
| 799 | size_t tmp; |
| 800 | |
| 801 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 802 | if (viodev->cmo.allocated) { |
| 803 | dev_err(&viodev->dev, "%s: device had %lu bytes of IO " |
| 804 | "allocated after remove operation.\n", |
| 805 | __func__, viodev->cmo.allocated); |
| 806 | BUG(); |
| 807 | } |
| 808 | |
| 809 | /* |
| 810 | * Remove the device from the device list being maintained for |
| 811 | * CMO enabled devices. |
| 812 | */ |
| 813 | list_for_each_entry(dev_ent, &vio_cmo.device_list, list) |
| 814 | if (viodev == dev_ent->viodev) { |
| 815 | list_del(&dev_ent->list); |
| 816 | kfree(dev_ent); |
| 817 | break; |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * Devices may not require any entitlement and they do not need |
| 822 | * to be processed. Otherwise, return the device's entitlement |
| 823 | * back to the pools. |
| 824 | */ |
| 825 | if (viodev->cmo.entitled) { |
| 826 | /* |
| 827 | * This device has not yet left the OF tree, it's |
| 828 | * minimum entitlement remains in vio_cmo.min and |
| 829 | * vio_cmo.desired |
| 830 | */ |
| 831 | vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT); |
| 832 | |
| 833 | /* |
| 834 | * Save min allocation for device in reserve as long |
| 835 | * as it exists in OF tree as determined by later |
| 836 | * balance operation |
| 837 | */ |
| 838 | viodev->cmo.entitled -= VIO_CMO_MIN_ENT; |
| 839 | |
| 840 | /* Replenish spare from freed reserve pool */ |
| 841 | if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) { |
| 842 | tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT - |
| 843 | vio_cmo.spare)); |
| 844 | vio_cmo.spare += tmp; |
| 845 | viodev->cmo.entitled -= tmp; |
| 846 | } |
| 847 | |
| 848 | /* Remaining reserve goes to excess pool */ |
| 849 | vio_cmo.excess.size += viodev->cmo.entitled; |
| 850 | vio_cmo.excess.free += viodev->cmo.entitled; |
| 851 | vio_cmo.reserve.size -= viodev->cmo.entitled; |
| 852 | |
| 853 | /* |
| 854 | * Until the device is removed it will keep a |
| 855 | * minimum entitlement; this will guarantee that |
| 856 | * a module unload/load will result in a success. |
| 857 | */ |
| 858 | viodev->cmo.entitled = VIO_CMO_MIN_ENT; |
| 859 | viodev->cmo.desired = VIO_CMO_MIN_ENT; |
| 860 | atomic_set(&viodev->cmo.allocs_failed, 0); |
| 861 | } |
| 862 | |
| 863 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 864 | } |
| 865 | |
| 866 | static void vio_cmo_set_dma_ops(struct vio_dev *viodev) |
| 867 | { |
Nishanth Aravamudan | 6d283d7 | 2010-10-18 07:26:59 +0000 | [diff] [blame] | 868 | set_dma_ops(&viodev->dev, &vio_dma_mapping_ops); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | /** |
| 872 | * vio_cmo_bus_init - CMO entitlement initialization at bus init time |
| 873 | * |
| 874 | * Set up the reserve and excess entitlement pools based on available |
| 875 | * system entitlement and the number of devices in the OF tree that |
| 876 | * require entitlement in the reserve pool. |
| 877 | */ |
| 878 | static void vio_cmo_bus_init(void) |
| 879 | { |
| 880 | struct hvcall_mpp_data mpp_data; |
| 881 | int err; |
| 882 | |
| 883 | memset(&vio_cmo, 0, sizeof(struct vio_cmo)); |
| 884 | spin_lock_init(&vio_cmo.lock); |
| 885 | INIT_LIST_HEAD(&vio_cmo.device_list); |
| 886 | INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance); |
| 887 | |
| 888 | /* Get current system entitlement */ |
| 889 | err = h_get_mpp(&mpp_data); |
| 890 | |
| 891 | /* |
| 892 | * On failure, continue with entitlement set to 0, will panic() |
| 893 | * later when spare is reserved. |
| 894 | */ |
| 895 | if (err != H_SUCCESS) { |
| 896 | printk(KERN_ERR "%s: unable to determine system IO "\ |
| 897 | "entitlement. (%d)\n", __func__, err); |
| 898 | vio_cmo.entitled = 0; |
| 899 | } else { |
| 900 | vio_cmo.entitled = mpp_data.entitled_mem; |
| 901 | } |
| 902 | |
| 903 | /* Set reservation and check against entitlement */ |
| 904 | vio_cmo.spare = VIO_CMO_MIN_ENT; |
| 905 | vio_cmo.reserve.size = vio_cmo.spare; |
| 906 | vio_cmo.reserve.size += (vio_cmo_num_OF_devs() * |
| 907 | VIO_CMO_MIN_ENT); |
| 908 | if (vio_cmo.reserve.size > vio_cmo.entitled) { |
| 909 | printk(KERN_ERR "%s: insufficient system entitlement\n", |
| 910 | __func__); |
| 911 | panic("%s: Insufficient system entitlement", __func__); |
| 912 | } |
| 913 | |
| 914 | /* Set the remaining accounting variables */ |
| 915 | vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size; |
| 916 | vio_cmo.excess.free = vio_cmo.excess.size; |
| 917 | vio_cmo.min = vio_cmo.reserve.size; |
| 918 | vio_cmo.desired = vio_cmo.reserve.size; |
| 919 | } |
| 920 | |
| 921 | /* sysfs device functions and data structures for CMO */ |
| 922 | |
| 923 | #define viodev_cmo_rd_attr(name) \ |
| 924 | static ssize_t viodev_cmo_##name##_show(struct device *dev, \ |
| 925 | struct device_attribute *attr, \ |
| 926 | char *buf) \ |
| 927 | { \ |
| 928 | return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name); \ |
| 929 | } |
| 930 | |
| 931 | static ssize_t viodev_cmo_allocs_failed_show(struct device *dev, |
| 932 | struct device_attribute *attr, char *buf) |
| 933 | { |
| 934 | struct vio_dev *viodev = to_vio_dev(dev); |
| 935 | return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed)); |
| 936 | } |
| 937 | |
| 938 | static ssize_t viodev_cmo_allocs_failed_reset(struct device *dev, |
| 939 | struct device_attribute *attr, const char *buf, size_t count) |
| 940 | { |
| 941 | struct vio_dev *viodev = to_vio_dev(dev); |
| 942 | atomic_set(&viodev->cmo.allocs_failed, 0); |
| 943 | return count; |
| 944 | } |
| 945 | |
| 946 | static ssize_t viodev_cmo_desired_set(struct device *dev, |
| 947 | struct device_attribute *attr, const char *buf, size_t count) |
| 948 | { |
| 949 | struct vio_dev *viodev = to_vio_dev(dev); |
| 950 | size_t new_desired; |
| 951 | int ret; |
| 952 | |
| 953 | ret = strict_strtoul(buf, 10, &new_desired); |
| 954 | if (ret) |
| 955 | return ret; |
| 956 | |
| 957 | vio_cmo_set_dev_desired(viodev, new_desired); |
| 958 | return count; |
| 959 | } |
| 960 | |
| 961 | viodev_cmo_rd_attr(desired); |
| 962 | viodev_cmo_rd_attr(entitled); |
| 963 | viodev_cmo_rd_attr(allocated); |
| 964 | |
| 965 | static ssize_t name_show(struct device *, struct device_attribute *, char *); |
| 966 | static ssize_t devspec_show(struct device *, struct device_attribute *, char *); |
Benjamin Herrenschmidt | 578b7cd | 2010-04-07 14:44:28 +1000 | [diff] [blame] | 967 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
| 968 | char *buf); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 969 | static struct device_attribute vio_cmo_dev_attrs[] = { |
| 970 | __ATTR_RO(name), |
| 971 | __ATTR_RO(devspec), |
Benjamin Herrenschmidt | 578b7cd | 2010-04-07 14:44:28 +1000 | [diff] [blame] | 972 | __ATTR_RO(modalias), |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 973 | __ATTR(cmo_desired, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH, |
| 974 | viodev_cmo_desired_show, viodev_cmo_desired_set), |
| 975 | __ATTR(cmo_entitled, S_IRUGO, viodev_cmo_entitled_show, NULL), |
| 976 | __ATTR(cmo_allocated, S_IRUGO, viodev_cmo_allocated_show, NULL), |
| 977 | __ATTR(cmo_allocs_failed, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH, |
| 978 | viodev_cmo_allocs_failed_show, viodev_cmo_allocs_failed_reset), |
| 979 | __ATTR_NULL |
| 980 | }; |
| 981 | |
| 982 | /* sysfs bus functions and data structures for CMO */ |
| 983 | |
| 984 | #define viobus_cmo_rd_attr(name) \ |
| 985 | static ssize_t \ |
| 986 | viobus_cmo_##name##_show(struct bus_type *bt, char *buf) \ |
| 987 | { \ |
| 988 | return sprintf(buf, "%lu\n", vio_cmo.name); \ |
| 989 | } |
| 990 | |
| 991 | #define viobus_cmo_pool_rd_attr(name, var) \ |
| 992 | static ssize_t \ |
| 993 | viobus_cmo_##name##_pool_show_##var(struct bus_type *bt, char *buf) \ |
| 994 | { \ |
| 995 | return sprintf(buf, "%lu\n", vio_cmo.name.var); \ |
| 996 | } |
| 997 | |
| 998 | static ssize_t viobus_cmo_high_reset(struct bus_type *bt, const char *buf, |
| 999 | size_t count) |
| 1000 | { |
| 1001 | unsigned long flags; |
| 1002 | |
| 1003 | spin_lock_irqsave(&vio_cmo.lock, flags); |
| 1004 | vio_cmo.high = vio_cmo.curr; |
| 1005 | spin_unlock_irqrestore(&vio_cmo.lock, flags); |
| 1006 | |
| 1007 | return count; |
| 1008 | } |
| 1009 | |
| 1010 | viobus_cmo_rd_attr(entitled); |
| 1011 | viobus_cmo_pool_rd_attr(reserve, size); |
| 1012 | viobus_cmo_pool_rd_attr(excess, size); |
| 1013 | viobus_cmo_pool_rd_attr(excess, free); |
| 1014 | viobus_cmo_rd_attr(spare); |
| 1015 | viobus_cmo_rd_attr(min); |
| 1016 | viobus_cmo_rd_attr(desired); |
| 1017 | viobus_cmo_rd_attr(curr); |
| 1018 | viobus_cmo_rd_attr(high); |
| 1019 | |
| 1020 | static struct bus_attribute vio_cmo_bus_attrs[] = { |
| 1021 | __ATTR(cmo_entitled, S_IRUGO, viobus_cmo_entitled_show, NULL), |
| 1022 | __ATTR(cmo_reserve_size, S_IRUGO, viobus_cmo_reserve_pool_show_size, NULL), |
| 1023 | __ATTR(cmo_excess_size, S_IRUGO, viobus_cmo_excess_pool_show_size, NULL), |
| 1024 | __ATTR(cmo_excess_free, S_IRUGO, viobus_cmo_excess_pool_show_free, NULL), |
| 1025 | __ATTR(cmo_spare, S_IRUGO, viobus_cmo_spare_show, NULL), |
| 1026 | __ATTR(cmo_min, S_IRUGO, viobus_cmo_min_show, NULL), |
| 1027 | __ATTR(cmo_desired, S_IRUGO, viobus_cmo_desired_show, NULL), |
| 1028 | __ATTR(cmo_curr, S_IRUGO, viobus_cmo_curr_show, NULL), |
| 1029 | __ATTR(cmo_high, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH, |
| 1030 | viobus_cmo_high_show, viobus_cmo_high_reset), |
| 1031 | __ATTR_NULL |
| 1032 | }; |
| 1033 | |
| 1034 | static void vio_cmo_sysfs_init(void) |
| 1035 | { |
| 1036 | vio_bus_type.dev_attrs = vio_cmo_dev_attrs; |
| 1037 | vio_bus_type.bus_attrs = vio_cmo_bus_attrs; |
| 1038 | } |
| 1039 | #else /* CONFIG_PPC_SMLPAR */ |
| 1040 | /* Dummy functions for iSeries platform */ |
| 1041 | int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; } |
| 1042 | void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {} |
| 1043 | static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; } |
| 1044 | static void vio_cmo_bus_remove(struct vio_dev *viodev) {} |
| 1045 | static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {} |
Nathan Lynch | b9fa49a | 2008-07-26 09:06:17 +1000 | [diff] [blame] | 1046 | static void vio_cmo_bus_init(void) {} |
| 1047 | static void vio_cmo_sysfs_init(void) { } |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1048 | #endif /* CONFIG_PPC_SMLPAR */ |
| 1049 | EXPORT_SYMBOL(vio_cmo_entitlement_update); |
| 1050 | EXPORT_SYMBOL(vio_cmo_set_dev_desired); |
| 1051 | |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1052 | static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev) |
| 1053 | { |
Stephen Rothwell | dd9b67a | 2007-10-11 14:55:02 +1000 | [diff] [blame] | 1054 | const unsigned char *dma_window; |
| 1055 | struct iommu_table *tbl; |
| 1056 | unsigned long offset, size; |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1057 | |
Stephen Rothwell | dd9b67a | 2007-10-11 14:55:02 +1000 | [diff] [blame] | 1058 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
| 1059 | return vio_build_iommu_table_iseries(dev); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1060 | |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 1061 | dma_window = of_get_property(dev->dev.of_node, |
Stephen Rothwell | dd9b67a | 2007-10-11 14:55:02 +1000 | [diff] [blame] | 1062 | "ibm,my-dma-window", NULL); |
| 1063 | if (!dma_window) |
| 1064 | return NULL; |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1065 | |
Anton Blanchard | 7aa241f | 2010-08-11 16:42:48 +0000 | [diff] [blame] | 1066 | tbl = kzalloc(sizeof(*tbl), GFP_KERNEL); |
roel kluin | 0f33727 | 2009-09-09 05:02:24 +0000 | [diff] [blame] | 1067 | if (tbl == NULL) |
| 1068 | return NULL; |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1069 | |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 1070 | of_parse_dma_window(dev->dev.of_node, dma_window, |
Stephen Rothwell | dd9b67a | 2007-10-11 14:55:02 +1000 | [diff] [blame] | 1071 | &tbl->it_index, &offset, &size); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1072 | |
Stephen Rothwell | dd9b67a | 2007-10-11 14:55:02 +1000 | [diff] [blame] | 1073 | /* TCE table size - measured in tce entries */ |
| 1074 | tbl->it_size = size >> IOMMU_PAGE_SHIFT; |
| 1075 | /* offset for VIO should always be 0 */ |
| 1076 | tbl->it_offset = offset >> IOMMU_PAGE_SHIFT; |
| 1077 | tbl->it_busno = 0; |
| 1078 | tbl->it_type = TCE_VB; |
Anton Blanchard | 7aa241f | 2010-08-11 16:42:48 +0000 | [diff] [blame] | 1079 | tbl->it_blocksize = 16; |
Stephen Rothwell | dd9b67a | 2007-10-11 14:55:02 +1000 | [diff] [blame] | 1080 | |
| 1081 | return iommu_init_table(tbl, -1); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1082 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1084 | /** |
| 1085 | * vio_match_device: - Tell if a VIO device has a matching |
| 1086 | * VIO device id structure. |
| 1087 | * @ids: array of VIO device id structures to search in |
| 1088 | * @dev: the VIO device structure to match against |
| 1089 | * |
| 1090 | * Used by a driver to check whether a VIO device present in the |
| 1091 | * system is in its list of supported devices. Returns the matching |
| 1092 | * vio_device_id structure or NULL if there is no match. |
| 1093 | */ |
| 1094 | static const struct vio_device_id *vio_match_device( |
| 1095 | const struct vio_device_id *ids, const struct vio_dev *dev) |
| 1096 | { |
| 1097 | while (ids->type[0] != '\0') { |
Stephen Rothwell | dd721ff | 2006-04-27 17:21:46 +1000 | [diff] [blame] | 1098 | if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) && |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 1099 | of_device_is_compatible(dev->dev.of_node, |
Benjamin Herrenschmidt | 12d04ee | 2006-11-11 17:25:02 +1100 | [diff] [blame] | 1100 | ids->compat)) |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1101 | return ids; |
| 1102 | ids++; |
| 1103 | } |
| 1104 | return NULL; |
| 1105 | } |
| 1106 | |
Stephen Rothwell | 5c0b4b8 | 2005-08-17 16:37:35 +1000 | [diff] [blame] | 1107 | /* |
| 1108 | * Convert from struct device to struct vio_dev and pass to driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | * dev->driver has already been set by generic code because vio_bus_match |
Stephen Rothwell | 5c0b4b8 | 2005-08-17 16:37:35 +1000 | [diff] [blame] | 1110 | * succeeded. |
| 1111 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | static int vio_bus_probe(struct device *dev) |
| 1113 | { |
| 1114 | struct vio_dev *viodev = to_vio_dev(dev); |
| 1115 | struct vio_driver *viodrv = to_vio_driver(dev->driver); |
| 1116 | const struct vio_device_id *id; |
| 1117 | int error = -ENODEV; |
| 1118 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | if (!viodrv->probe) |
| 1120 | return error; |
| 1121 | |
| 1122 | id = vio_match_device(viodrv->id_table, viodev); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1123 | if (id) { |
| 1124 | memset(&viodev->cmo, 0, sizeof(viodev->cmo)); |
| 1125 | if (firmware_has_feature(FW_FEATURE_CMO)) { |
| 1126 | error = vio_cmo_bus_probe(viodev); |
| 1127 | if (error) |
| 1128 | return error; |
| 1129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | error = viodrv->probe(viodev, id); |
Brian King | cd5aeb9 | 2008-08-13 05:21:45 +1000 | [diff] [blame] | 1131 | if (error && firmware_has_feature(FW_FEATURE_CMO)) |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1132 | vio_cmo_bus_remove(viodev); |
| 1133 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
| 1135 | return error; |
| 1136 | } |
| 1137 | |
| 1138 | /* convert from struct device to struct vio_dev and pass to driver. */ |
| 1139 | static int vio_bus_remove(struct device *dev) |
| 1140 | { |
| 1141 | struct vio_dev *viodev = to_vio_dev(dev); |
| 1142 | struct vio_driver *viodrv = to_vio_driver(dev->driver); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1143 | struct device *devptr; |
| 1144 | int ret = 1; |
| 1145 | |
| 1146 | /* |
| 1147 | * Hold a reference to the device after the remove function is called |
| 1148 | * to allow for CMO accounting cleanup for the device. |
| 1149 | */ |
| 1150 | devptr = get_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | |
Stephen Rothwell | 5c0b4b8 | 2005-08-17 16:37:35 +1000 | [diff] [blame] | 1152 | if (viodrv->remove) |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1153 | ret = viodrv->remove(viodev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1155 | if (!ret && firmware_has_feature(FW_FEATURE_CMO)) |
| 1156 | vio_cmo_bus_remove(viodev); |
| 1157 | |
| 1158 | put_device(devptr); |
| 1159 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | } |
| 1161 | |
| 1162 | /** |
| 1163 | * vio_register_driver: - Register a new vio driver |
| 1164 | * @drv: The vio_driver structure to be registered. |
| 1165 | */ |
| 1166 | int vio_register_driver(struct vio_driver *viodrv) |
| 1167 | { |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 1168 | printk(KERN_DEBUG "%s: driver %s registering\n", __func__, |
Stephen Rothwell | 6fdf539 | 2005-10-24 14:53:21 +1000 | [diff] [blame] | 1169 | viodrv->driver.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | |
| 1171 | /* fill in 'struct driver' fields */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | viodrv->driver.bus = &vio_bus_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
| 1174 | return driver_register(&viodrv->driver); |
| 1175 | } |
| 1176 | EXPORT_SYMBOL(vio_register_driver); |
| 1177 | |
| 1178 | /** |
| 1179 | * vio_unregister_driver - Remove registration of vio driver. |
| 1180 | * @driver: The vio_driver struct to be removed form registration |
| 1181 | */ |
| 1182 | void vio_unregister_driver(struct vio_driver *viodrv) |
| 1183 | { |
| 1184 | driver_unregister(&viodrv->driver); |
| 1185 | } |
| 1186 | EXPORT_SYMBOL(vio_unregister_driver); |
| 1187 | |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1188 | /* vio_dev refcount hit 0 */ |
| 1189 | static void __devinit vio_dev_release(struct device *dev) |
| 1190 | { |
Nishanth Aravamudan | 45848e0 | 2010-09-15 08:05:48 +0000 | [diff] [blame] | 1191 | struct iommu_table *tbl = get_iommu_table_base(dev); |
| 1192 | |
| 1193 | /* iSeries uses a common table for all vio devices */ |
| 1194 | if (!firmware_has_feature(FW_FEATURE_ISERIES) && tbl) |
| 1195 | iommu_free_table(tbl, dev->of_node ? |
| 1196 | dev->of_node->full_name : dev_name(dev)); |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 1197 | of_node_put(dev->of_node); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1198 | kfree(to_vio_dev(dev)); |
| 1199 | } |
| 1200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | /** |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1202 | * vio_register_device_node: - Register a new vio device. |
| 1203 | * @of_node: The OF node for this device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | * |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1205 | * Creates and initializes a vio_dev structure from the data in |
Benjamin Herrenschmidt | 12d04ee | 2006-11-11 17:25:02 +1100 | [diff] [blame] | 1206 | * of_node and adds it to the list of virtual devices. |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1207 | * Returns a pointer to the created vio_dev or NULL if node has |
| 1208 | * NULL device_type or compatible fields. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | */ |
Stephen Rothwell | de7d812 | 2008-02-05 14:15:12 +1100 | [diff] [blame] | 1210 | struct vio_dev *vio_register_device_node(struct device_node *of_node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | { |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1212 | struct vio_dev *viodev; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1213 | const unsigned int *unit_address; |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1214 | |
| 1215 | /* we need the 'device_type' property, in order to match with drivers */ |
| 1216 | if (of_node->type == NULL) { |
| 1217 | printk(KERN_WARNING "%s: node %s missing 'device_type'\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 1218 | __func__, |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1219 | of_node->name ? of_node->name : "<unknown>"); |
| 1220 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | } |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1222 | |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 1223 | unit_address = of_get_property(of_node, "reg", NULL); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1224 | if (unit_address == NULL) { |
| 1225 | printk(KERN_WARNING "%s: node %s missing 'reg'\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 1226 | __func__, |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1227 | of_node->name ? of_node->name : "<unknown>"); |
| 1228 | return NULL; |
| 1229 | } |
| 1230 | |
| 1231 | /* allocate a vio_dev for this node */ |
| 1232 | viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL); |
| 1233 | if (viodev == NULL) |
| 1234 | return NULL; |
| 1235 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 1236 | viodev->irq = irq_of_parse_and_map(of_node, 0); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1237 | |
Kay Sievers | aab0d37 | 2008-12-04 10:02:56 -0800 | [diff] [blame] | 1238 | dev_set_name(&viodev->dev, "%x", *unit_address); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1239 | viodev->name = of_node->name; |
| 1240 | viodev->type = of_node->type; |
| 1241 | viodev->unit_address = *unit_address; |
| 1242 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 1243 | unit_address = of_get_property(of_node, |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1244 | "linux,unit_address", NULL); |
| 1245 | if (unit_address != NULL) |
| 1246 | viodev->unit_address = *unit_address; |
| 1247 | } |
Grant Likely | d706c1b | 2010-04-13 16:12:28 -0700 | [diff] [blame] | 1248 | viodev->dev.of_node = of_node_get(of_node); |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1249 | |
| 1250 | if (firmware_has_feature(FW_FEATURE_CMO)) |
| 1251 | vio_cmo_set_dma_ops(viodev); |
| 1252 | else |
Nishanth Aravamudan | 6d283d7 | 2010-10-18 07:26:59 +0000 | [diff] [blame] | 1253 | set_dma_ops(&viodev->dev, &dma_iommu_ops); |
Becky Bruce | 738ef42 | 2009-09-21 08:26:35 +0000 | [diff] [blame] | 1254 | set_iommu_table_base(&viodev->dev, vio_build_iommu_table(viodev)); |
Becky Bruce | 8fae035 | 2008-09-08 09:09:54 +0000 | [diff] [blame] | 1255 | set_dev_node(&viodev->dev, of_node_to_nid(of_node)); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1256 | |
| 1257 | /* init generic 'struct device' fields: */ |
| 1258 | viodev->dev.parent = &vio_bus_device.dev; |
| 1259 | viodev->dev.bus = &vio_bus_type; |
| 1260 | viodev->dev.release = vio_dev_release; |
Nishanth Aravamudan | b3c7385 | 2010-10-18 07:27:04 +0000 | [diff] [blame] | 1261 | /* needed to ensure proper operation of coherent allocations |
| 1262 | * later, in case driver doesn't set it explicitly */ |
| 1263 | dma_set_mask(&viodev->dev, DMA_BIT_MASK(64)); |
| 1264 | dma_set_coherent_mask(&viodev->dev, DMA_BIT_MASK(64)); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1265 | |
| 1266 | /* register with generic device framework */ |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1267 | if (device_register(&viodev->dev)) { |
| 1268 | printk(KERN_ERR "%s: failed to register device %s\n", |
Kay Sievers | aab0d37 | 2008-12-04 10:02:56 -0800 | [diff] [blame] | 1269 | __func__, dev_name(&viodev->dev)); |
Nishanth Aravamudan | edea8f6 | 2010-09-15 08:05:47 +0000 | [diff] [blame] | 1270 | put_device(&viodev->dev); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1271 | return NULL; |
| 1272 | } |
| 1273 | |
| 1274 | return viodev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | } |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1276 | EXPORT_SYMBOL(vio_register_device_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | /** |
| 1279 | * vio_bus_init: - Initialize the virtual IO bus |
| 1280 | */ |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1281 | static int __init vio_bus_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | { |
| 1283 | int err; |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1284 | struct device_node *node_vroot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1286 | if (firmware_has_feature(FW_FEATURE_CMO)) |
| 1287 | vio_cmo_sysfs_init(); |
| 1288 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | err = bus_register(&vio_bus_type); |
| 1290 | if (err) { |
| 1291 | printk(KERN_ERR "failed to register VIO bus\n"); |
| 1292 | return err; |
| 1293 | } |
| 1294 | |
Stephen Rothwell | 5c0b4b8 | 2005-08-17 16:37:35 +1000 | [diff] [blame] | 1295 | /* |
| 1296 | * The fake parent of all vio devices, just to give us |
Stephen Rothwell | 3e494c8 | 2005-07-12 17:40:17 +1000 | [diff] [blame] | 1297 | * a nice directory |
| 1298 | */ |
Stephen Rothwell | ac5b33c | 2005-06-21 17:15:54 -0700 | [diff] [blame] | 1299 | err = device_register(&vio_bus_device.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | if (err) { |
Stephen Rothwell | 3e494c8 | 2005-07-12 17:40:17 +1000 | [diff] [blame] | 1301 | printk(KERN_WARNING "%s: device_register returned %i\n", |
Harvey Harrison | e48b1b4 | 2008-03-29 08:21:07 +1100 | [diff] [blame] | 1302 | __func__, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | return err; |
| 1304 | } |
| 1305 | |
Robert Jennings | a90ab95 | 2008-07-24 04:31:33 +1000 | [diff] [blame] | 1306 | if (firmware_has_feature(FW_FEATURE_CMO)) |
| 1307 | vio_cmo_bus_init(); |
| 1308 | |
Stephen Rothwell | 30686ba | 2007-04-24 13:53:04 +1000 | [diff] [blame] | 1309 | node_vroot = of_find_node_by_name(NULL, "vdevice"); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1310 | if (node_vroot) { |
| 1311 | struct device_node *of_node; |
| 1312 | |
| 1313 | /* |
| 1314 | * Create struct vio_devices for each virtual device in |
| 1315 | * the device tree. Drivers will associate with them later. |
| 1316 | */ |
| 1317 | for (of_node = node_vroot->child; of_node != NULL; |
Stephen Rothwell | c546726 | 2007-09-21 14:29:28 +1000 | [diff] [blame] | 1318 | of_node = of_node->sibling) |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1319 | vio_register_device_node(of_node); |
Stephen Rothwell | 30686ba | 2007-04-24 13:53:04 +1000 | [diff] [blame] | 1320 | of_node_put(node_vroot); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1321 | } |
| 1322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | return 0; |
| 1324 | } |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1325 | __initcall(vio_bus_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1327 | static ssize_t name_show(struct device *dev, |
Stephen Rothwell | 5c0b4b8 | 2005-08-17 16:37:35 +1000 | [diff] [blame] | 1328 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | { |
| 1330 | return sprintf(buf, "%s\n", to_vio_dev(dev)->name); |
| 1331 | } |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1332 | |
| 1333 | static ssize_t devspec_show(struct device *dev, |
| 1334 | struct device_attribute *attr, char *buf) |
| 1335 | { |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 1336 | struct device_node *of_node = dev->of_node; |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1337 | |
| 1338 | return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none"); |
| 1339 | } |
| 1340 | |
Benjamin Herrenschmidt | 578b7cd | 2010-04-07 14:44:28 +1000 | [diff] [blame] | 1341 | static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
| 1342 | char *buf) |
| 1343 | { |
| 1344 | const struct vio_dev *vio_dev = to_vio_dev(dev); |
| 1345 | struct device_node *dn; |
| 1346 | const char *cp; |
| 1347 | |
Grant Likely | cf9b59e9d | 2010-05-22 00:36:56 -0600 | [diff] [blame] | 1348 | dn = dev->of_node; |
Benjamin Herrenschmidt | 578b7cd | 2010-04-07 14:44:28 +1000 | [diff] [blame] | 1349 | if (!dn) |
| 1350 | return -ENODEV; |
| 1351 | cp = of_get_property(dn, "compatible", NULL); |
| 1352 | if (!cp) |
| 1353 | return -ENODEV; |
| 1354 | |
| 1355 | return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp); |
| 1356 | } |
| 1357 | |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1358 | static struct device_attribute vio_dev_attrs[] = { |
| 1359 | __ATTR_RO(name), |
| 1360 | __ATTR_RO(devspec), |
Benjamin Herrenschmidt | 578b7cd | 2010-04-07 14:44:28 +1000 | [diff] [blame] | 1361 | __ATTR_RO(modalias), |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1362 | __ATTR_NULL |
| 1363 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | void __devinit vio_unregister_device(struct vio_dev *viodev) |
| 1366 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | device_unregister(&viodev->dev); |
| 1368 | } |
| 1369 | EXPORT_SYMBOL(vio_unregister_device); |
| 1370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | static int vio_bus_match(struct device *dev, struct device_driver *drv) |
| 1372 | { |
| 1373 | const struct vio_dev *vio_dev = to_vio_dev(dev); |
| 1374 | struct vio_driver *vio_drv = to_vio_driver(drv); |
| 1375 | const struct vio_device_id *ids = vio_drv->id_table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | |
Stephen Rothwell | 5c0b4b8 | 2005-08-17 16:37:35 +1000 | [diff] [blame] | 1377 | return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | } |
| 1379 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 1380 | static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env) |
Olaf Hering | 143dcec | 2005-11-08 21:34:36 -0800 | [diff] [blame] | 1381 | { |
| 1382 | const struct vio_dev *vio_dev = to_vio_dev(dev); |
Benjamin Herrenschmidt | 12d04ee | 2006-11-11 17:25:02 +1100 | [diff] [blame] | 1383 | struct device_node *dn; |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1384 | const char *cp; |
Olaf Hering | 143dcec | 2005-11-08 21:34:36 -0800 | [diff] [blame] | 1385 | |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 1386 | dn = dev->of_node; |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1387 | if (!dn) |
Olaf Hering | 143dcec | 2005-11-08 21:34:36 -0800 | [diff] [blame] | 1388 | return -ENODEV; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 1389 | cp = of_get_property(dn, "compatible", NULL); |
Olaf Hering | 143dcec | 2005-11-08 21:34:36 -0800 | [diff] [blame] | 1390 | if (!cp) |
| 1391 | return -ENODEV; |
| 1392 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 1393 | add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp); |
Olaf Hering | 143dcec | 2005-11-08 21:34:36 -0800 | [diff] [blame] | 1394 | return 0; |
| 1395 | } |
| 1396 | |
Stephen Rothwell | 6fccab2 | 2007-09-21 14:32:05 +1000 | [diff] [blame] | 1397 | static struct bus_type vio_bus_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | .name = "vio", |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1399 | .dev_attrs = vio_dev_attrs, |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 1400 | .uevent = vio_hotplug, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | .match = vio_bus_match, |
Russell King | 2f53a80 | 2006-01-05 14:36:47 +0000 | [diff] [blame] | 1402 | .probe = vio_bus_probe, |
| 1403 | .remove = vio_bus_remove, |
Brian King | a1263c7 | 2010-05-14 12:04:41 +0000 | [diff] [blame] | 1404 | .pm = GENERIC_SUBSYS_PM_OPS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | }; |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1406 | |
| 1407 | /** |
| 1408 | * vio_get_attribute: - get attribute for virtual device |
| 1409 | * @vdev: The vio device to get property. |
| 1410 | * @which: The property/attribute to be extracted. |
| 1411 | * @length: Pointer to length of returned data size (unused if NULL). |
| 1412 | * |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 1413 | * Calls prom.c's of_get_property() to return the value of the |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1414 | * attribute specified by @which |
| 1415 | */ |
| 1416 | const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length) |
| 1417 | { |
Grant Likely | 58f9b0b | 2010-04-13 16:12:56 -0700 | [diff] [blame] | 1418 | return of_get_property(vdev->dev.of_node, which, length); |
Stephen Rothwell | e10fa77 | 2006-04-27 17:18:21 +1000 | [diff] [blame] | 1419 | } |
| 1420 | EXPORT_SYMBOL(vio_get_attribute); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1421 | |
| 1422 | #ifdef CONFIG_PPC_PSERIES |
| 1423 | /* vio_find_name() - internal because only vio.c knows how we formatted the |
| 1424 | * kobject name |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1425 | */ |
Paul Mackerras | c847c85 | 2008-01-27 11:45:30 +1100 | [diff] [blame] | 1426 | static struct vio_dev *vio_find_name(const char *name) |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1427 | { |
Paul Mackerras | c847c85 | 2008-01-27 11:45:30 +1100 | [diff] [blame] | 1428 | struct device *found; |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1429 | |
Paul Mackerras | c847c85 | 2008-01-27 11:45:30 +1100 | [diff] [blame] | 1430 | found = bus_find_device_by_name(&vio_bus_type, NULL, name); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1431 | if (!found) |
| 1432 | return NULL; |
| 1433 | |
Paul Mackerras | c847c85 | 2008-01-27 11:45:30 +1100 | [diff] [blame] | 1434 | return to_vio_dev(found); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1435 | } |
| 1436 | |
| 1437 | /** |
| 1438 | * vio_find_node - find an already-registered vio_dev |
| 1439 | * @vnode: device_node of the virtual device we're looking for |
| 1440 | */ |
| 1441 | struct vio_dev *vio_find_node(struct device_node *vnode) |
| 1442 | { |
Jeremy Kerr | a7f67bd | 2006-07-12 15:35:54 +1000 | [diff] [blame] | 1443 | const uint32_t *unit_address; |
Kay Sievers | aab0d37 | 2008-12-04 10:02:56 -0800 | [diff] [blame] | 1444 | char kobj_name[20]; |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1445 | |
| 1446 | /* construct the kobject name from the device node */ |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 1447 | unit_address = of_get_property(vnode, "reg", NULL); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1448 | if (!unit_address) |
| 1449 | return NULL; |
Kay Sievers | aab0d37 | 2008-12-04 10:02:56 -0800 | [diff] [blame] | 1450 | snprintf(kobj_name, sizeof(kobj_name), "%x", *unit_address); |
Stephen Rothwell | c7f0e8c | 2006-04-27 17:23:32 +1000 | [diff] [blame] | 1451 | |
| 1452 | return vio_find_name(kobj_name); |
| 1453 | } |
| 1454 | EXPORT_SYMBOL(vio_find_node); |
| 1455 | |
| 1456 | int vio_enable_interrupts(struct vio_dev *dev) |
| 1457 | { |
| 1458 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE); |
| 1459 | if (rc != H_SUCCESS) |
| 1460 | printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc); |
| 1461 | return rc; |
| 1462 | } |
| 1463 | EXPORT_SYMBOL(vio_enable_interrupts); |
| 1464 | |
| 1465 | int vio_disable_interrupts(struct vio_dev *dev) |
| 1466 | { |
| 1467 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE); |
| 1468 | if (rc != H_SUCCESS) |
| 1469 | printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc); |
| 1470 | return rc; |
| 1471 | } |
| 1472 | EXPORT_SYMBOL(vio_disable_interrupts); |
| 1473 | #endif /* CONFIG_PPC_PSERIES */ |