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1/*
2 * IBM PowerPC Virtual I/O Infrastructure Support.
3 *
4 * Copyright (c) 2003,2008 IBM Corp.
5 * Dave Engebretsen engebret@us.ibm.com
6 * Santiago Leon santil@us.ibm.com
7 * Hollis Blanchard <hollisb@us.ibm.com>
8 * Stephen Rothwell
9 * Robert Jennings <rcjenn@us.ibm.com>
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
17#include <linux/cpu.h>
18#include <linux/types.h>
19#include <linux/delay.h>
20#include <linux/stat.h>
21#include <linux/device.h>
22#include <linux/init.h>
23#include <linux/slab.h>
24#include <linux/console.h>
25#include <linux/export.h>
26#include <linux/mm.h>
27#include <linux/dma-mapping.h>
28#include <linux/kobject.h>
29
30#include <asm/iommu.h>
31#include <asm/dma.h>
32#include <asm/vio.h>
33#include <asm/prom.h>
34#include <asm/firmware.h>
35#include <asm/tce.h>
36#include <asm/page.h>
37#include <asm/hvcall.h>
38
39static struct vio_dev vio_bus_device = { /* fake "parent" device */
40 .name = "vio",
41 .type = "",
42 .dev.init_name = "vio",
43 .dev.bus = &vio_bus_type,
44};
45
46#ifdef CONFIG_PPC_SMLPAR
47/**
48 * vio_cmo_pool - A pool of IO memory for CMO use
49 *
50 * @size: The size of the pool in bytes
51 * @free: The amount of free memory in the pool
52 */
53struct vio_cmo_pool {
54 size_t size;
55 size_t free;
56};
57
58/* How many ms to delay queued balance work */
59#define VIO_CMO_BALANCE_DELAY 100
60
61/* Portion out IO memory to CMO devices by this chunk size */
62#define VIO_CMO_BALANCE_CHUNK 131072
63
64/**
65 * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement
66 *
67 * @vio_dev: struct vio_dev pointer
68 * @list: pointer to other devices on bus that are being tracked
69 */
70struct vio_cmo_dev_entry {
71 struct vio_dev *viodev;
72 struct list_head list;
73};
74
75/**
76 * vio_cmo - VIO bus accounting structure for CMO entitlement
77 *
78 * @lock: spinlock for entire structure
79 * @balance_q: work queue for balancing system entitlement
80 * @device_list: list of CMO-enabled devices requiring entitlement
81 * @entitled: total system entitlement in bytes
82 * @reserve: pool of memory from which devices reserve entitlement, incl. spare
83 * @excess: pool of excess entitlement not needed for device reserves or spare
84 * @spare: IO memory for device hotplug functionality
85 * @min: minimum necessary for system operation
86 * @desired: desired memory for system operation
87 * @curr: bytes currently allocated
88 * @high: high water mark for IO data usage
89 */
90struct vio_cmo {
91 spinlock_t lock;
92 struct delayed_work balance_q;
93 struct list_head device_list;
94 size_t entitled;
95 struct vio_cmo_pool reserve;
96 struct vio_cmo_pool excess;
97 size_t spare;
98 size_t min;
99 size_t desired;
100 size_t curr;
101 size_t high;
102} vio_cmo;
103
104/**
105 * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows
106 */
107static int vio_cmo_num_OF_devs(void)
108{
109 struct device_node *node_vroot;
110 int count = 0;
111
112 /*
113 * Count the number of vdevice entries with an
114 * ibm,my-dma-window OF property
115 */
116 node_vroot = of_find_node_by_name(NULL, "vdevice");
117 if (node_vroot) {
118 struct device_node *of_node;
119 struct property *prop;
120
121 for_each_child_of_node(node_vroot, of_node) {
122 prop = of_find_property(of_node, "ibm,my-dma-window",
123 NULL);
124 if (prop)
125 count++;
126 }
127 }
128 of_node_put(node_vroot);
129 return count;
130}
131
132/**
133 * vio_cmo_alloc - allocate IO memory for CMO-enable devices
134 *
135 * @viodev: VIO device requesting IO memory
136 * @size: size of allocation requested
137 *
138 * Allocations come from memory reserved for the devices and any excess
139 * IO memory available to all devices. The spare pool used to service
140 * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be
141 * made available.
142 *
143 * Return codes:
144 * 0 for successful allocation and -ENOMEM for a failure
145 */
146static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size)
147{
148 unsigned long flags;
149 size_t reserve_free = 0;
150 size_t excess_free = 0;
151 int ret = -ENOMEM;
152
153 spin_lock_irqsave(&vio_cmo.lock, flags);
154
155 /* Determine the amount of free entitlement available in reserve */
156 if (viodev->cmo.entitled > viodev->cmo.allocated)
157 reserve_free = viodev->cmo.entitled - viodev->cmo.allocated;
158
159 /* If spare is not fulfilled, the excess pool can not be used. */
160 if (vio_cmo.spare >= VIO_CMO_MIN_ENT)
161 excess_free = vio_cmo.excess.free;
162
163 /* The request can be satisfied */
164 if ((reserve_free + excess_free) >= size) {
165 vio_cmo.curr += size;
166 if (vio_cmo.curr > vio_cmo.high)
167 vio_cmo.high = vio_cmo.curr;
168 viodev->cmo.allocated += size;
169 size -= min(reserve_free, size);
170 vio_cmo.excess.free -= size;
171 ret = 0;
172 }
173
174 spin_unlock_irqrestore(&vio_cmo.lock, flags);
175 return ret;
176}
177
178/**
179 * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices
180 * @viodev: VIO device freeing IO memory
181 * @size: size of deallocation
182 *
183 * IO memory is freed by the device back to the correct memory pools.
184 * The spare pool is replenished first from either memory pool, then
185 * the reserve pool is used to reduce device entitlement, the excess
186 * pool is used to increase the reserve pool toward the desired entitlement
187 * target, and then the remaining memory is returned to the pools.
188 *
189 */
190static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size)
191{
192 unsigned long flags;
193 size_t spare_needed = 0;
194 size_t excess_freed = 0;
195 size_t reserve_freed = size;
196 size_t tmp;
197 int balance = 0;
198
199 spin_lock_irqsave(&vio_cmo.lock, flags);
200 vio_cmo.curr -= size;
201
202 /* Amount of memory freed from the excess pool */
203 if (viodev->cmo.allocated > viodev->cmo.entitled) {
204 excess_freed = min(reserve_freed, (viodev->cmo.allocated -
205 viodev->cmo.entitled));
206 reserve_freed -= excess_freed;
207 }
208
209 /* Remove allocation from device */
210 viodev->cmo.allocated -= (reserve_freed + excess_freed);
211
212 /* Spare is a subset of the reserve pool, replenish it first. */
213 spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare;
214
215 /*
216 * Replenish the spare in the reserve pool from the excess pool.
217 * This moves entitlement into the reserve pool.
218 */
219 if (spare_needed && excess_freed) {
220 tmp = min(excess_freed, spare_needed);
221 vio_cmo.excess.size -= tmp;
222 vio_cmo.reserve.size += tmp;
223 vio_cmo.spare += tmp;
224 excess_freed -= tmp;
225 spare_needed -= tmp;
226 balance = 1;
227 }
228
229 /*
230 * Replenish the spare in the reserve pool from the reserve pool.
231 * This removes entitlement from the device down to VIO_CMO_MIN_ENT,
232 * if needed, and gives it to the spare pool. The amount of used
233 * memory in this pool does not change.
234 */
235 if (spare_needed && reserve_freed) {
236 tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT));
237
238 vio_cmo.spare += tmp;
239 viodev->cmo.entitled -= tmp;
240 reserve_freed -= tmp;
241 spare_needed -= tmp;
242 balance = 1;
243 }
244
245 /*
246 * Increase the reserve pool until the desired allocation is met.
247 * Move an allocation freed from the excess pool into the reserve
248 * pool and schedule a balance operation.
249 */
250 if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) {
251 tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size));
252
253 vio_cmo.excess.size -= tmp;
254 vio_cmo.reserve.size += tmp;
255 excess_freed -= tmp;
256 balance = 1;
257 }
258
259 /* Return memory from the excess pool to that pool */
260 if (excess_freed)
261 vio_cmo.excess.free += excess_freed;
262
263 if (balance)
264 schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY);
265 spin_unlock_irqrestore(&vio_cmo.lock, flags);
266}
267
268/**
269 * vio_cmo_entitlement_update - Manage system entitlement changes
270 *
271 * @new_entitlement: new system entitlement to attempt to accommodate
272 *
273 * Increases in entitlement will be used to fulfill the spare entitlement
274 * and the rest is given to the excess pool. Decreases, if they are
275 * possible, come from the excess pool and from unused device entitlement
276 *
277 * Returns: 0 on success, -ENOMEM when change can not be made
278 */
279int vio_cmo_entitlement_update(size_t new_entitlement)
280{
281 struct vio_dev *viodev;
282 struct vio_cmo_dev_entry *dev_ent;
283 unsigned long flags;
284 size_t avail, delta, tmp;
285
286 spin_lock_irqsave(&vio_cmo.lock, flags);
287
288 /* Entitlement increases */
289 if (new_entitlement > vio_cmo.entitled) {
290 delta = new_entitlement - vio_cmo.entitled;
291
292 /* Fulfill spare allocation */
293 if (vio_cmo.spare < VIO_CMO_MIN_ENT) {
294 tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare));
295 vio_cmo.spare += tmp;
296 vio_cmo.reserve.size += tmp;
297 delta -= tmp;
298 }
299
300 /* Remaining new allocation goes to the excess pool */
301 vio_cmo.entitled += delta;
302 vio_cmo.excess.size += delta;
303 vio_cmo.excess.free += delta;
304
305 goto out;
306 }
307
308 /* Entitlement decreases */
309 delta = vio_cmo.entitled - new_entitlement;
310 avail = vio_cmo.excess.free;
311
312 /*
313 * Need to check how much unused entitlement each device can
314 * sacrifice to fulfill entitlement change.
315 */
316 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
317 if (avail >= delta)
318 break;
319
320 viodev = dev_ent->viodev;
321 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
322 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
323 avail += viodev->cmo.entitled -
324 max_t(size_t, viodev->cmo.allocated,
325 VIO_CMO_MIN_ENT);
326 }
327
328 if (delta <= avail) {
329 vio_cmo.entitled -= delta;
330
331 /* Take entitlement from the excess pool first */
332 tmp = min(vio_cmo.excess.free, delta);
333 vio_cmo.excess.size -= tmp;
334 vio_cmo.excess.free -= tmp;
335 delta -= tmp;
336
337 /*
338 * Remove all but VIO_CMO_MIN_ENT bytes from devices
339 * until entitlement change is served
340 */
341 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
342 if (!delta)
343 break;
344
345 viodev = dev_ent->viodev;
346 tmp = 0;
347 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
348 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
349 tmp = viodev->cmo.entitled -
350 max_t(size_t, viodev->cmo.allocated,
351 VIO_CMO_MIN_ENT);
352 viodev->cmo.entitled -= min(tmp, delta);
353 delta -= min(tmp, delta);
354 }
355 } else {
356 spin_unlock_irqrestore(&vio_cmo.lock, flags);
357 return -ENOMEM;
358 }
359
360out:
361 schedule_delayed_work(&vio_cmo.balance_q, 0);
362 spin_unlock_irqrestore(&vio_cmo.lock, flags);
363 return 0;
364}
365
366/**
367 * vio_cmo_balance - Balance entitlement among devices
368 *
369 * @work: work queue structure for this operation
370 *
371 * Any system entitlement above the minimum needed for devices, or
372 * already allocated to devices, can be distributed to the devices.
373 * The list of devices is iterated through to recalculate the desired
374 * entitlement level and to determine how much entitlement above the
375 * minimum entitlement is allocated to devices.
376 *
377 * Small chunks of the available entitlement are given to devices until
378 * their requirements are fulfilled or there is no entitlement left to give.
379 * Upon completion sizes of the reserve and excess pools are calculated.
380 *
381 * The system minimum entitlement level is also recalculated here.
382 * Entitlement will be reserved for devices even after vio_bus_remove to
383 * accommodate reloading the driver. The OF tree is walked to count the
384 * number of devices present and this will remove entitlement for devices
385 * that have actually left the system after having vio_bus_remove called.
386 */
387static void vio_cmo_balance(struct work_struct *work)
388{
389 struct vio_cmo *cmo;
390 struct vio_dev *viodev;
391 struct vio_cmo_dev_entry *dev_ent;
392 unsigned long flags;
393 size_t avail = 0, level, chunk, need;
394 int devcount = 0, fulfilled;
395
396 cmo = container_of(work, struct vio_cmo, balance_q.work);
397
398 spin_lock_irqsave(&vio_cmo.lock, flags);
399
400 /* Calculate minimum entitlement and fulfill spare */
401 cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT;
402 BUG_ON(cmo->min > cmo->entitled);
403 cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min));
404 cmo->min += cmo->spare;
405 cmo->desired = cmo->min;
406
407 /*
408 * Determine how much entitlement is available and reset device
409 * entitlements
410 */
411 avail = cmo->entitled - cmo->spare;
412 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
413 viodev = dev_ent->viodev;
414 devcount++;
415 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
416 cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT);
417 avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT);
418 }
419
420 /*
421 * Having provided each device with the minimum entitlement, loop
422 * over the devices portioning out the remaining entitlement
423 * until there is nothing left.
424 */
425 level = VIO_CMO_MIN_ENT;
426 while (avail) {
427 fulfilled = 0;
428 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
429 viodev = dev_ent->viodev;
430
431 if (viodev->cmo.desired <= level) {
432 fulfilled++;
433 continue;
434 }
435
436 /*
437 * Give the device up to VIO_CMO_BALANCE_CHUNK
438 * bytes of entitlement, but do not exceed the
439 * desired level of entitlement for the device.
440 */
441 chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK);
442 chunk = min(chunk, (viodev->cmo.desired -
443 viodev->cmo.entitled));
444 viodev->cmo.entitled += chunk;
445
446 /*
447 * If the memory for this entitlement increase was
448 * already allocated to the device it does not come
449 * from the available pool being portioned out.
450 */
451 need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
452 max(viodev->cmo.allocated, level);
453 avail -= need;
454
455 }
456 if (fulfilled == devcount)
457 break;
458 level += VIO_CMO_BALANCE_CHUNK;
459 }
460
461 /* Calculate new reserve and excess pool sizes */
462 cmo->reserve.size = cmo->min;
463 cmo->excess.free = 0;
464 cmo->excess.size = 0;
465 need = 0;
466 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
467 viodev = dev_ent->viodev;
468 /* Calculated reserve size above the minimum entitlement */
469 if (viodev->cmo.entitled)
470 cmo->reserve.size += (viodev->cmo.entitled -
471 VIO_CMO_MIN_ENT);
472 /* Calculated used excess entitlement */
473 if (viodev->cmo.allocated > viodev->cmo.entitled)
474 need += viodev->cmo.allocated - viodev->cmo.entitled;
475 }
476 cmo->excess.size = cmo->entitled - cmo->reserve.size;
477 cmo->excess.free = cmo->excess.size - need;
478
479 cancel_delayed_work(to_delayed_work(work));
480 spin_unlock_irqrestore(&vio_cmo.lock, flags);
481}
482
483static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
484 dma_addr_t *dma_handle, gfp_t flag,
485 struct dma_attrs *attrs)
486{
487 struct vio_dev *viodev = to_vio_dev(dev);
488 void *ret;
489
490 if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
491 atomic_inc(&viodev->cmo.allocs_failed);
492 return NULL;
493 }
494
495 ret = dma_iommu_ops.alloc(dev, size, dma_handle, flag, attrs);
496 if (unlikely(ret == NULL)) {
497 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
498 atomic_inc(&viodev->cmo.allocs_failed);
499 }
500
501 return ret;
502}
503
504static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
505 void *vaddr, dma_addr_t dma_handle,
506 struct dma_attrs *attrs)
507{
508 struct vio_dev *viodev = to_vio_dev(dev);
509
510 dma_iommu_ops.free(dev, size, vaddr, dma_handle, attrs);
511
512 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
513}
514
515static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
516 unsigned long offset, size_t size,
517 enum dma_data_direction direction,
518 struct dma_attrs *attrs)
519{
520 struct vio_dev *viodev = to_vio_dev(dev);
521 struct iommu_table *tbl;
522 dma_addr_t ret = DMA_ERROR_CODE;
523
524 tbl = get_iommu_table_base(dev);
525 if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)))) {
526 atomic_inc(&viodev->cmo.allocs_failed);
527 return ret;
528 }
529
530 ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs);
531 if (unlikely(dma_mapping_error(dev, ret))) {
532 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
533 atomic_inc(&viodev->cmo.allocs_failed);
534 }
535
536 return ret;
537}
538
539static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
540 size_t size,
541 enum dma_data_direction direction,
542 struct dma_attrs *attrs)
543{
544 struct vio_dev *viodev = to_vio_dev(dev);
545 struct iommu_table *tbl;
546
547 tbl = get_iommu_table_base(dev);
548 dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs);
549
550 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
551}
552
553static 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 iommu_table *tbl;
559 struct scatterlist *sgl;
560 int ret, count = 0;
561 size_t alloc_size = 0;
562
563 tbl = get_iommu_table_base(dev);
564 for (sgl = sglist; count < nelems; count++, sgl++)
565 alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
566
567 if (vio_cmo_alloc(viodev, alloc_size)) {
568 atomic_inc(&viodev->cmo.allocs_failed);
569 return 0;
570 }
571
572 ret = dma_iommu_ops.map_sg(dev, sglist, nelems, direction, attrs);
573
574 if (unlikely(!ret)) {
575 vio_cmo_dealloc(viodev, alloc_size);
576 atomic_inc(&viodev->cmo.allocs_failed);
577 return ret;
578 }
579
580 for (sgl = sglist, count = 0; count < ret; count++, sgl++)
581 alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
582 if (alloc_size)
583 vio_cmo_dealloc(viodev, alloc_size);
584
585 return ret;
586}
587
588static void vio_dma_iommu_unmap_sg(struct device *dev,
589 struct scatterlist *sglist, int nelems,
590 enum dma_data_direction direction,
591 struct dma_attrs *attrs)
592{
593 struct vio_dev *viodev = to_vio_dev(dev);
594 struct iommu_table *tbl;
595 struct scatterlist *sgl;
596 size_t alloc_size = 0;
597 int count = 0;
598
599 tbl = get_iommu_table_base(dev);
600 for (sgl = sglist; count < nelems; count++, sgl++)
601 alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
602
603 dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs);
604
605 vio_cmo_dealloc(viodev, alloc_size);
606}
607
608static int vio_dma_iommu_dma_supported(struct device *dev, u64 mask)
609{
610 return dma_iommu_ops.dma_supported(dev, mask);
611}
612
613static u64 vio_dma_get_required_mask(struct device *dev)
614{
615 return dma_iommu_ops.get_required_mask(dev);
616}
617
618struct dma_map_ops vio_dma_mapping_ops = {
619 .alloc = vio_dma_iommu_alloc_coherent,
620 .free = vio_dma_iommu_free_coherent,
621 .mmap = dma_direct_mmap_coherent,
622 .map_sg = vio_dma_iommu_map_sg,
623 .unmap_sg = vio_dma_iommu_unmap_sg,
624 .map_page = vio_dma_iommu_map_page,
625 .unmap_page = vio_dma_iommu_unmap_page,
626 .dma_supported = vio_dma_iommu_dma_supported,
627 .get_required_mask = vio_dma_get_required_mask,
628};
629
630/**
631 * vio_cmo_set_dev_desired - Set desired entitlement for a device
632 *
633 * @viodev: struct vio_dev for device to alter
634 * @desired: new desired entitlement level in bytes
635 *
636 * For use by devices to request a change to their entitlement at runtime or
637 * through sysfs. The desired entitlement level is changed and a balancing
638 * of system resources is scheduled to run in the future.
639 */
640void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired)
641{
642 unsigned long flags;
643 struct vio_cmo_dev_entry *dev_ent;
644 int found = 0;
645
646 if (!firmware_has_feature(FW_FEATURE_CMO))
647 return;
648
649 spin_lock_irqsave(&vio_cmo.lock, flags);
650 if (desired < VIO_CMO_MIN_ENT)
651 desired = VIO_CMO_MIN_ENT;
652
653 /*
654 * Changes will not be made for devices not in the device list.
655 * If it is not in the device list, then no driver is loaded
656 * for the device and it can not receive entitlement.
657 */
658 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
659 if (viodev == dev_ent->viodev) {
660 found = 1;
661 break;
662 }
663 if (!found) {
664 spin_unlock_irqrestore(&vio_cmo.lock, flags);
665 return;
666 }
667
668 /* Increase/decrease in desired device entitlement */
669 if (desired >= viodev->cmo.desired) {
670 /* Just bump the bus and device values prior to a balance*/
671 vio_cmo.desired += desired - viodev->cmo.desired;
672 viodev->cmo.desired = desired;
673 } else {
674 /* Decrease bus and device values for desired entitlement */
675 vio_cmo.desired -= viodev->cmo.desired - desired;
676 viodev->cmo.desired = desired;
677 /*
678 * If less entitlement is desired than current entitlement, move
679 * any reserve memory in the change region to the excess pool.
680 */
681 if (viodev->cmo.entitled > desired) {
682 vio_cmo.reserve.size -= viodev->cmo.entitled - desired;
683 vio_cmo.excess.size += viodev->cmo.entitled - desired;
684 /*
685 * If entitlement moving from the reserve pool to the
686 * excess pool is currently unused, add to the excess
687 * free counter.
688 */
689 if (viodev->cmo.allocated < viodev->cmo.entitled)
690 vio_cmo.excess.free += viodev->cmo.entitled -
691 max(viodev->cmo.allocated, desired);
692 viodev->cmo.entitled = desired;
693 }
694 }
695 schedule_delayed_work(&vio_cmo.balance_q, 0);
696 spin_unlock_irqrestore(&vio_cmo.lock, flags);
697}
698
699/**
700 * vio_cmo_bus_probe - Handle CMO specific bus probe activities
701 *
702 * @viodev - Pointer to struct vio_dev for device
703 *
704 * Determine the devices IO memory entitlement needs, attempting
705 * to satisfy the system minimum entitlement at first and scheduling
706 * a balance operation to take care of the rest at a later time.
707 *
708 * Returns: 0 on success, -EINVAL when device doesn't support CMO, and
709 * -ENOMEM when entitlement is not available for device or
710 * device entry.
711 *
712 */
713static int vio_cmo_bus_probe(struct vio_dev *viodev)
714{
715 struct vio_cmo_dev_entry *dev_ent;
716 struct device *dev = &viodev->dev;
717 struct iommu_table *tbl;
718 struct vio_driver *viodrv = to_vio_driver(dev->driver);
719 unsigned long flags;
720 size_t size;
721 bool dma_capable = false;
722
723 tbl = get_iommu_table_base(dev);
724
725 /* A device requires entitlement if it has a DMA window property */
726 switch (viodev->family) {
727 case VDEVICE:
728 if (of_get_property(viodev->dev.of_node,
729 "ibm,my-dma-window", NULL))
730 dma_capable = true;
731 break;
732 case PFO:
733 dma_capable = false;
734 break;
735 default:
736 dev_warn(dev, "unknown device family: %d\n", viodev->family);
737 BUG();
738 break;
739 }
740
741 /* Configure entitlement for the device. */
742 if (dma_capable) {
743 /* Check that the driver is CMO enabled and get desired DMA */
744 if (!viodrv->get_desired_dma) {
745 dev_err(dev, "%s: device driver does not support CMO\n",
746 __func__);
747 return -EINVAL;
748 }
749
750 viodev->cmo.desired =
751 IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev), tbl);
752 if (viodev->cmo.desired < VIO_CMO_MIN_ENT)
753 viodev->cmo.desired = VIO_CMO_MIN_ENT;
754 size = VIO_CMO_MIN_ENT;
755
756 dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry),
757 GFP_KERNEL);
758 if (!dev_ent)
759 return -ENOMEM;
760
761 dev_ent->viodev = viodev;
762 spin_lock_irqsave(&vio_cmo.lock, flags);
763 list_add(&dev_ent->list, &vio_cmo.device_list);
764 } else {
765 viodev->cmo.desired = 0;
766 size = 0;
767 spin_lock_irqsave(&vio_cmo.lock, flags);
768 }
769
770 /*
771 * If the needs for vio_cmo.min have not changed since they
772 * were last set, the number of devices in the OF tree has
773 * been constant and the IO memory for this is already in
774 * the reserve pool.
775 */
776 if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) *
777 VIO_CMO_MIN_ENT)) {
778 /* Updated desired entitlement if device requires it */
779 if (size)
780 vio_cmo.desired += (viodev->cmo.desired -
781 VIO_CMO_MIN_ENT);
782 } else {
783 size_t tmp;
784
785 tmp = vio_cmo.spare + vio_cmo.excess.free;
786 if (tmp < size) {
787 dev_err(dev, "%s: insufficient free "
788 "entitlement to add device. "
789 "Need %lu, have %lu\n", __func__,
790 size, (vio_cmo.spare + tmp));
791 spin_unlock_irqrestore(&vio_cmo.lock, flags);
792 return -ENOMEM;
793 }
794
795 /* Use excess pool first to fulfill request */
796 tmp = min(size, vio_cmo.excess.free);
797 vio_cmo.excess.free -= tmp;
798 vio_cmo.excess.size -= tmp;
799 vio_cmo.reserve.size += tmp;
800
801 /* Use spare if excess pool was insufficient */
802 vio_cmo.spare -= size - tmp;
803
804 /* Update bus accounting */
805 vio_cmo.min += size;
806 vio_cmo.desired += viodev->cmo.desired;
807 }
808 spin_unlock_irqrestore(&vio_cmo.lock, flags);
809 return 0;
810}
811
812/**
813 * vio_cmo_bus_remove - Handle CMO specific bus removal activities
814 *
815 * @viodev - Pointer to struct vio_dev for device
816 *
817 * Remove the device from the cmo device list. The minimum entitlement
818 * will be reserved for the device as long as it is in the system. The
819 * rest of the entitlement the device had been allocated will be returned
820 * to the system.
821 */
822static void vio_cmo_bus_remove(struct vio_dev *viodev)
823{
824 struct vio_cmo_dev_entry *dev_ent;
825 unsigned long flags;
826 size_t tmp;
827
828 spin_lock_irqsave(&vio_cmo.lock, flags);
829 if (viodev->cmo.allocated) {
830 dev_err(&viodev->dev, "%s: device had %lu bytes of IO "
831 "allocated after remove operation.\n",
832 __func__, viodev->cmo.allocated);
833 BUG();
834 }
835
836 /*
837 * Remove the device from the device list being maintained for
838 * CMO enabled devices.
839 */
840 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
841 if (viodev == dev_ent->viodev) {
842 list_del(&dev_ent->list);
843 kfree(dev_ent);
844 break;
845 }
846
847 /*
848 * Devices may not require any entitlement and they do not need
849 * to be processed. Otherwise, return the device's entitlement
850 * back to the pools.
851 */
852 if (viodev->cmo.entitled) {
853 /*
854 * This device has not yet left the OF tree, it's
855 * minimum entitlement remains in vio_cmo.min and
856 * vio_cmo.desired
857 */
858 vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT);
859
860 /*
861 * Save min allocation for device in reserve as long
862 * as it exists in OF tree as determined by later
863 * balance operation
864 */
865 viodev->cmo.entitled -= VIO_CMO_MIN_ENT;
866
867 /* Replenish spare from freed reserve pool */
868 if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) {
869 tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT -
870 vio_cmo.spare));
871 vio_cmo.spare += tmp;
872 viodev->cmo.entitled -= tmp;
873 }
874
875 /* Remaining reserve goes to excess pool */
876 vio_cmo.excess.size += viodev->cmo.entitled;
877 vio_cmo.excess.free += viodev->cmo.entitled;
878 vio_cmo.reserve.size -= viodev->cmo.entitled;
879
880 /*
881 * Until the device is removed it will keep a
882 * minimum entitlement; this will guarantee that
883 * a module unload/load will result in a success.
884 */
885 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
886 viodev->cmo.desired = VIO_CMO_MIN_ENT;
887 atomic_set(&viodev->cmo.allocs_failed, 0);
888 }
889
890 spin_unlock_irqrestore(&vio_cmo.lock, flags);
891}
892
893static void vio_cmo_set_dma_ops(struct vio_dev *viodev)
894{
895 set_dma_ops(&viodev->dev, &vio_dma_mapping_ops);
896}
897
898/**
899 * vio_cmo_bus_init - CMO entitlement initialization at bus init time
900 *
901 * Set up the reserve and excess entitlement pools based on available
902 * system entitlement and the number of devices in the OF tree that
903 * require entitlement in the reserve pool.
904 */
905static void vio_cmo_bus_init(void)
906{
907 struct hvcall_mpp_data mpp_data;
908 int err;
909
910 memset(&vio_cmo, 0, sizeof(struct vio_cmo));
911 spin_lock_init(&vio_cmo.lock);
912 INIT_LIST_HEAD(&vio_cmo.device_list);
913 INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance);
914
915 /* Get current system entitlement */
916 err = h_get_mpp(&mpp_data);
917
918 /*
919 * On failure, continue with entitlement set to 0, will panic()
920 * later when spare is reserved.
921 */
922 if (err != H_SUCCESS) {
923 printk(KERN_ERR "%s: unable to determine system IO "\
924 "entitlement. (%d)\n", __func__, err);
925 vio_cmo.entitled = 0;
926 } else {
927 vio_cmo.entitled = mpp_data.entitled_mem;
928 }
929
930 /* Set reservation and check against entitlement */
931 vio_cmo.spare = VIO_CMO_MIN_ENT;
932 vio_cmo.reserve.size = vio_cmo.spare;
933 vio_cmo.reserve.size += (vio_cmo_num_OF_devs() *
934 VIO_CMO_MIN_ENT);
935 if (vio_cmo.reserve.size > vio_cmo.entitled) {
936 printk(KERN_ERR "%s: insufficient system entitlement\n",
937 __func__);
938 panic("%s: Insufficient system entitlement", __func__);
939 }
940
941 /* Set the remaining accounting variables */
942 vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size;
943 vio_cmo.excess.free = vio_cmo.excess.size;
944 vio_cmo.min = vio_cmo.reserve.size;
945 vio_cmo.desired = vio_cmo.reserve.size;
946}
947
948/* sysfs device functions and data structures for CMO */
949
950#define viodev_cmo_rd_attr(name) \
951static ssize_t viodev_cmo_##name##_show(struct device *dev, \
952 struct device_attribute *attr, \
953 char *buf) \
954{ \
955 return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name); \
956}
957
958static ssize_t viodev_cmo_allocs_failed_show(struct device *dev,
959 struct device_attribute *attr, char *buf)
960{
961 struct vio_dev *viodev = to_vio_dev(dev);
962 return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
963}
964
965static ssize_t viodev_cmo_allocs_failed_reset(struct device *dev,
966 struct device_attribute *attr, const char *buf, size_t count)
967{
968 struct vio_dev *viodev = to_vio_dev(dev);
969 atomic_set(&viodev->cmo.allocs_failed, 0);
970 return count;
971}
972
973static ssize_t viodev_cmo_desired_set(struct device *dev,
974 struct device_attribute *attr, const char *buf, size_t count)
975{
976 struct vio_dev *viodev = to_vio_dev(dev);
977 size_t new_desired;
978 int ret;
979
980 ret = strict_strtoul(buf, 10, &new_desired);
981 if (ret)
982 return ret;
983
984 vio_cmo_set_dev_desired(viodev, new_desired);
985 return count;
986}
987
988viodev_cmo_rd_attr(desired);
989viodev_cmo_rd_attr(entitled);
990viodev_cmo_rd_attr(allocated);
991
992static ssize_t name_show(struct device *, struct device_attribute *, char *);
993static ssize_t devspec_show(struct device *, struct device_attribute *, char *);
994static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
995 char *buf);
996static struct device_attribute vio_cmo_dev_attrs[] = {
997 __ATTR_RO(name),
998 __ATTR_RO(devspec),
999 __ATTR_RO(modalias),
1000 __ATTR(cmo_desired, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
1001 viodev_cmo_desired_show, viodev_cmo_desired_set),
1002 __ATTR(cmo_entitled, S_IRUGO, viodev_cmo_entitled_show, NULL),
1003 __ATTR(cmo_allocated, S_IRUGO, viodev_cmo_allocated_show, NULL),
1004 __ATTR(cmo_allocs_failed, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
1005 viodev_cmo_allocs_failed_show, viodev_cmo_allocs_failed_reset),
1006 __ATTR_NULL
1007};
1008
1009/* sysfs bus functions and data structures for CMO */
1010
1011#define viobus_cmo_rd_attr(name) \
1012static ssize_t cmo_##name##_show(struct bus_type *bt, char *buf) \
1013{ \
1014 return sprintf(buf, "%lu\n", vio_cmo.name); \
1015} \
1016static BUS_ATTR_RO(cmo_##name)
1017
1018#define viobus_cmo_pool_rd_attr(name, var) \
1019static ssize_t \
1020cmo_##name##_##var##_show(struct bus_type *bt, char *buf) \
1021{ \
1022 return sprintf(buf, "%lu\n", vio_cmo.name.var); \
1023} \
1024static BUS_ATTR_RO(cmo_##name##_##var)
1025
1026viobus_cmo_rd_attr(entitled);
1027viobus_cmo_rd_attr(spare);
1028viobus_cmo_rd_attr(min);
1029viobus_cmo_rd_attr(desired);
1030viobus_cmo_rd_attr(curr);
1031viobus_cmo_pool_rd_attr(reserve, size);
1032viobus_cmo_pool_rd_attr(excess, size);
1033viobus_cmo_pool_rd_attr(excess, free);
1034
1035static ssize_t cmo_high_show(struct bus_type *bt, char *buf)
1036{
1037 return sprintf(buf, "%lu\n", vio_cmo.high);
1038}
1039
1040static ssize_t cmo_high_store(struct bus_type *bt, const char *buf,
1041 size_t count)
1042{
1043 unsigned long flags;
1044
1045 spin_lock_irqsave(&vio_cmo.lock, flags);
1046 vio_cmo.high = vio_cmo.curr;
1047 spin_unlock_irqrestore(&vio_cmo.lock, flags);
1048
1049 return count;
1050}
1051static BUS_ATTR_RW(cmo_high);
1052
1053static struct attribute *vio_bus_attrs[] = {
1054 &bus_attr_cmo_entitled.attr,
1055 &bus_attr_cmo_spare.attr,
1056 &bus_attr_cmo_min.attr,
1057 &bus_attr_cmo_desired.attr,
1058 &bus_attr_cmo_curr.attr,
1059 &bus_attr_cmo_high.attr,
1060 &bus_attr_cmo_reserve_size.attr,
1061 &bus_attr_cmo_excess_size.attr,
1062 &bus_attr_cmo_excess_free.attr,
1063 NULL,
1064};
1065ATTRIBUTE_GROUPS(vio_bus);
1066
1067static void vio_cmo_sysfs_init(void)
1068{
1069 vio_bus_type.dev_attrs = vio_cmo_dev_attrs;
1070 vio_bus_type.bus_groups = vio_bus_groups;
1071}
1072#else /* CONFIG_PPC_SMLPAR */
1073int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; }
1074void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {}
1075static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; }
1076static void vio_cmo_bus_remove(struct vio_dev *viodev) {}
1077static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {}
1078static void vio_cmo_bus_init(void) {}
1079static void vio_cmo_sysfs_init(void) { }
1080#endif /* CONFIG_PPC_SMLPAR */
1081EXPORT_SYMBOL(vio_cmo_entitlement_update);
1082EXPORT_SYMBOL(vio_cmo_set_dev_desired);
1083
1084
1085/*
1086 * Platform Facilities Option (PFO) support
1087 */
1088
1089/**
1090 * vio_h_cop_sync - Perform a synchronous PFO co-processor operation
1091 *
1092 * @vdev - Pointer to a struct vio_dev for device
1093 * @op - Pointer to a struct vio_pfo_op for the operation parameters
1094 *
1095 * Calls the hypervisor to synchronously perform the PFO operation
1096 * described in @op. In the case of a busy response from the hypervisor,
1097 * the operation will be re-submitted indefinitely unless a non-zero timeout
1098 * is specified or an error occurs. The timeout places a limit on when to
1099 * stop re-submitting a operation, the total time can be exceeded if an
1100 * operation is in progress.
1101 *
1102 * If op->hcall_ret is not NULL, this will be set to the return from the
1103 * last h_cop_op call or it will be 0 if an error not involving the h_call
1104 * was encountered.
1105 *
1106 * Returns:
1107 * 0 on success,
1108 * -EINVAL if the h_call fails due to an invalid parameter,
1109 * -E2BIG if the h_call can not be performed synchronously,
1110 * -EBUSY if a timeout is specified and has elapsed,
1111 * -EACCES if the memory area for data/status has been rescinded, or
1112 * -EPERM if a hardware fault has been indicated
1113 */
1114int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op)
1115{
1116 struct device *dev = &vdev->dev;
1117 unsigned long deadline = 0;
1118 long hret = 0;
1119 int ret = 0;
1120
1121 if (op->timeout)
1122 deadline = jiffies + msecs_to_jiffies(op->timeout);
1123
1124 while (true) {
1125 hret = plpar_hcall_norets(H_COP, op->flags,
1126 vdev->resource_id,
1127 op->in, op->inlen, op->out,
1128 op->outlen, op->csbcpb);
1129
1130 if (hret == H_SUCCESS ||
1131 (hret != H_NOT_ENOUGH_RESOURCES &&
1132 hret != H_BUSY && hret != H_RESOURCE) ||
1133 (op->timeout && time_after(deadline, jiffies)))
1134 break;
1135
1136 dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret);
1137 }
1138
1139 switch (hret) {
1140 case H_SUCCESS:
1141 ret = 0;
1142 break;
1143 case H_OP_MODE:
1144 case H_TOO_BIG:
1145 ret = -E2BIG;
1146 break;
1147 case H_RESCINDED:
1148 ret = -EACCES;
1149 break;
1150 case H_HARDWARE:
1151 ret = -EPERM;
1152 break;
1153 case H_NOT_ENOUGH_RESOURCES:
1154 case H_RESOURCE:
1155 case H_BUSY:
1156 ret = -EBUSY;
1157 break;
1158 default:
1159 ret = -EINVAL;
1160 break;
1161 }
1162
1163 if (ret)
1164 dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n",
1165 __func__, ret, hret);
1166
1167 op->hcall_err = hret;
1168 return ret;
1169}
1170EXPORT_SYMBOL(vio_h_cop_sync);
1171
1172static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
1173{
1174 const __be32 *dma_window;
1175 struct iommu_table *tbl;
1176 unsigned long offset, size;
1177
1178 dma_window = of_get_property(dev->dev.of_node,
1179 "ibm,my-dma-window", NULL);
1180 if (!dma_window)
1181 return NULL;
1182
1183 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
1184 if (tbl == NULL)
1185 return NULL;
1186
1187 of_parse_dma_window(dev->dev.of_node, dma_window,
1188 &tbl->it_index, &offset, &size);
1189
1190 /* TCE table size - measured in tce entries */
1191 tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
1192 tbl->it_size = size >> tbl->it_page_shift;
1193 /* offset for VIO should always be 0 */
1194 tbl->it_offset = offset >> tbl->it_page_shift;
1195 tbl->it_busno = 0;
1196 tbl->it_type = TCE_VB;
1197 tbl->it_blocksize = 16;
1198
1199 return iommu_init_table(tbl, -1);
1200}
1201
1202/**
1203 * vio_match_device: - Tell if a VIO device has a matching
1204 * VIO device id structure.
1205 * @ids: array of VIO device id structures to search in
1206 * @dev: the VIO device structure to match against
1207 *
1208 * Used by a driver to check whether a VIO device present in the
1209 * system is in its list of supported devices. Returns the matching
1210 * vio_device_id structure or NULL if there is no match.
1211 */
1212static const struct vio_device_id *vio_match_device(
1213 const struct vio_device_id *ids, const struct vio_dev *dev)
1214{
1215 while (ids->type[0] != '\0') {
1216 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
1217 of_device_is_compatible(dev->dev.of_node,
1218 ids->compat))
1219 return ids;
1220 ids++;
1221 }
1222 return NULL;
1223}
1224
1225/*
1226 * Convert from struct device to struct vio_dev and pass to driver.
1227 * dev->driver has already been set by generic code because vio_bus_match
1228 * succeeded.
1229 */
1230static int vio_bus_probe(struct device *dev)
1231{
1232 struct vio_dev *viodev = to_vio_dev(dev);
1233 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1234 const struct vio_device_id *id;
1235 int error = -ENODEV;
1236
1237 if (!viodrv->probe)
1238 return error;
1239
1240 id = vio_match_device(viodrv->id_table, viodev);
1241 if (id) {
1242 memset(&viodev->cmo, 0, sizeof(viodev->cmo));
1243 if (firmware_has_feature(FW_FEATURE_CMO)) {
1244 error = vio_cmo_bus_probe(viodev);
1245 if (error)
1246 return error;
1247 }
1248 error = viodrv->probe(viodev, id);
1249 if (error && firmware_has_feature(FW_FEATURE_CMO))
1250 vio_cmo_bus_remove(viodev);
1251 }
1252
1253 return error;
1254}
1255
1256/* convert from struct device to struct vio_dev and pass to driver. */
1257static int vio_bus_remove(struct device *dev)
1258{
1259 struct vio_dev *viodev = to_vio_dev(dev);
1260 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1261 struct device *devptr;
1262 int ret = 1;
1263
1264 /*
1265 * Hold a reference to the device after the remove function is called
1266 * to allow for CMO accounting cleanup for the device.
1267 */
1268 devptr = get_device(dev);
1269
1270 if (viodrv->remove)
1271 ret = viodrv->remove(viodev);
1272
1273 if (!ret && firmware_has_feature(FW_FEATURE_CMO))
1274 vio_cmo_bus_remove(viodev);
1275
1276 put_device(devptr);
1277 return ret;
1278}
1279
1280/**
1281 * vio_register_driver: - Register a new vio driver
1282 * @viodrv: The vio_driver structure to be registered.
1283 */
1284int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
1285 const char *mod_name)
1286{
1287 pr_debug("%s: driver %s registering\n", __func__, viodrv->name);
1288
1289 /* fill in 'struct driver' fields */
1290 viodrv->driver.name = viodrv->name;
1291 viodrv->driver.pm = viodrv->pm;
1292 viodrv->driver.bus = &vio_bus_type;
1293 viodrv->driver.owner = owner;
1294 viodrv->driver.mod_name = mod_name;
1295
1296 return driver_register(&viodrv->driver);
1297}
1298EXPORT_SYMBOL(__vio_register_driver);
1299
1300/**
1301 * vio_unregister_driver - Remove registration of vio driver.
1302 * @viodrv: The vio_driver struct to be removed form registration
1303 */
1304void vio_unregister_driver(struct vio_driver *viodrv)
1305{
1306 driver_unregister(&viodrv->driver);
1307}
1308EXPORT_SYMBOL(vio_unregister_driver);
1309
1310/* vio_dev refcount hit 0 */
1311static void vio_dev_release(struct device *dev)
1312{
1313 struct iommu_table *tbl = get_iommu_table_base(dev);
1314
1315 if (tbl)
1316 iommu_free_table(tbl, of_node_full_name(dev->of_node));
1317 of_node_put(dev->of_node);
1318 kfree(to_vio_dev(dev));
1319}
1320
1321/**
1322 * vio_register_device_node: - Register a new vio device.
1323 * @of_node: The OF node for this device.
1324 *
1325 * Creates and initializes a vio_dev structure from the data in
1326 * of_node and adds it to the list of virtual devices.
1327 * Returns a pointer to the created vio_dev or NULL if node has
1328 * NULL device_type or compatible fields.
1329 */
1330struct vio_dev *vio_register_device_node(struct device_node *of_node)
1331{
1332 struct vio_dev *viodev;
1333 struct device_node *parent_node;
1334 const __be32 *prop;
1335 enum vio_dev_family family;
1336 const char *of_node_name = of_node->name ? of_node->name : "<unknown>";
1337
1338 /*
1339 * Determine if this node is a under the /vdevice node or under the
1340 * /ibm,platform-facilities node. This decides the device's family.
1341 */
1342 parent_node = of_get_parent(of_node);
1343 if (parent_node) {
1344 if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
1345 family = PFO;
1346 else if (!strcmp(parent_node->full_name, "/vdevice"))
1347 family = VDEVICE;
1348 else {
1349 pr_warn("%s: parent(%s) of %s not recognized.\n",
1350 __func__,
1351 parent_node->full_name,
1352 of_node_name);
1353 of_node_put(parent_node);
1354 return NULL;
1355 }
1356 of_node_put(parent_node);
1357 } else {
1358 pr_warn("%s: could not determine the parent of node %s.\n",
1359 __func__, of_node_name);
1360 return NULL;
1361 }
1362
1363 if (family == PFO) {
1364 if (of_get_property(of_node, "interrupt-controller", NULL)) {
1365 pr_debug("%s: Skipping the interrupt controller %s.\n",
1366 __func__, of_node_name);
1367 return NULL;
1368 }
1369 }
1370
1371 /* allocate a vio_dev for this node */
1372 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
1373 if (viodev == NULL) {
1374 pr_warn("%s: allocation failure for VIO device.\n", __func__);
1375 return NULL;
1376 }
1377
1378 /* we need the 'device_type' property, in order to match with drivers */
1379 viodev->family = family;
1380 if (viodev->family == VDEVICE) {
1381 unsigned int unit_address;
1382
1383 if (of_node->type != NULL)
1384 viodev->type = of_node->type;
1385 else {
1386 pr_warn("%s: node %s is missing the 'device_type' "
1387 "property.\n", __func__, of_node_name);
1388 goto out;
1389 }
1390
1391 prop = of_get_property(of_node, "reg", NULL);
1392 if (prop == NULL) {
1393 pr_warn("%s: node %s missing 'reg'\n",
1394 __func__, of_node_name);
1395 goto out;
1396 }
1397 unit_address = of_read_number(prop, 1);
1398 dev_set_name(&viodev->dev, "%x", unit_address);
1399 viodev->irq = irq_of_parse_and_map(of_node, 0);
1400 viodev->unit_address = unit_address;
1401 } else {
1402 /* PFO devices need their resource_id for submitting COP_OPs
1403 * This is an optional field for devices, but is required when
1404 * performing synchronous ops */
1405 prop = of_get_property(of_node, "ibm,resource-id", NULL);
1406 if (prop != NULL)
1407 viodev->resource_id = of_read_number(prop, 1);
1408
1409 dev_set_name(&viodev->dev, "%s", of_node_name);
1410 viodev->type = of_node_name;
1411 viodev->irq = 0;
1412 }
1413
1414 viodev->name = of_node->name;
1415 viodev->dev.of_node = of_node_get(of_node);
1416
1417 set_dev_node(&viodev->dev, of_node_to_nid(of_node));
1418
1419 /* init generic 'struct device' fields: */
1420 viodev->dev.parent = &vio_bus_device.dev;
1421 viodev->dev.bus = &vio_bus_type;
1422 viodev->dev.release = vio_dev_release;
1423
1424 if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) {
1425 if (firmware_has_feature(FW_FEATURE_CMO))
1426 vio_cmo_set_dma_ops(viodev);
1427 else
1428 set_dma_ops(&viodev->dev, &dma_iommu_ops);
1429
1430 set_iommu_table_base(&viodev->dev,
1431 vio_build_iommu_table(viodev));
1432
1433 /* needed to ensure proper operation of coherent allocations
1434 * later, in case driver doesn't set it explicitly */
1435 viodev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
1436 viodev->dev.dma_mask = &viodev->dev.coherent_dma_mask;
1437 }
1438
1439 /* register with generic device framework */
1440 if (device_register(&viodev->dev)) {
1441 printk(KERN_ERR "%s: failed to register device %s\n",
1442 __func__, dev_name(&viodev->dev));
1443 put_device(&viodev->dev);
1444 return NULL;
1445 }
1446
1447 return viodev;
1448
1449out: /* Use this exit point for any return prior to device_register */
1450 kfree(viodev);
1451
1452 return NULL;
1453}
1454EXPORT_SYMBOL(vio_register_device_node);
1455
1456/*
1457 * vio_bus_scan_for_devices - Scan OF and register each child device
1458 * @root_name - OF node name for the root of the subtree to search.
1459 * This must be non-NULL
1460 *
1461 * Starting from the root node provide, register the device node for
1462 * each child beneath the root.
1463 */
1464static void vio_bus_scan_register_devices(char *root_name)
1465{
1466 struct device_node *node_root, *node_child;
1467
1468 if (!root_name)
1469 return;
1470
1471 node_root = of_find_node_by_name(NULL, root_name);
1472 if (node_root) {
1473
1474 /*
1475 * Create struct vio_devices for each virtual device in
1476 * the device tree. Drivers will associate with them later.
1477 */
1478 node_child = of_get_next_child(node_root, NULL);
1479 while (node_child) {
1480 vio_register_device_node(node_child);
1481 node_child = of_get_next_child(node_root, node_child);
1482 }
1483 of_node_put(node_root);
1484 }
1485}
1486
1487/**
1488 * vio_bus_init: - Initialize the virtual IO bus
1489 */
1490static int __init vio_bus_init(void)
1491{
1492 int err;
1493
1494 if (firmware_has_feature(FW_FEATURE_CMO))
1495 vio_cmo_sysfs_init();
1496
1497 err = bus_register(&vio_bus_type);
1498 if (err) {
1499 printk(KERN_ERR "failed to register VIO bus\n");
1500 return err;
1501 }
1502
1503 /*
1504 * The fake parent of all vio devices, just to give us
1505 * a nice directory
1506 */
1507 err = device_register(&vio_bus_device.dev);
1508 if (err) {
1509 printk(KERN_WARNING "%s: device_register returned %i\n",
1510 __func__, err);
1511 return err;
1512 }
1513
1514 if (firmware_has_feature(FW_FEATURE_CMO))
1515 vio_cmo_bus_init();
1516
1517 return 0;
1518}
1519postcore_initcall(vio_bus_init);
1520
1521static int __init vio_device_init(void)
1522{
1523 vio_bus_scan_register_devices("vdevice");
1524 vio_bus_scan_register_devices("ibm,platform-facilities");
1525
1526 return 0;
1527}
1528device_initcall(vio_device_init);
1529
1530static ssize_t name_show(struct device *dev,
1531 struct device_attribute *attr, char *buf)
1532{
1533 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
1534}
1535
1536static ssize_t devspec_show(struct device *dev,
1537 struct device_attribute *attr, char *buf)
1538{
1539 struct device_node *of_node = dev->of_node;
1540
1541 return sprintf(buf, "%s\n", of_node_full_name(of_node));
1542}
1543
1544static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1545 char *buf)
1546{
1547 const struct vio_dev *vio_dev = to_vio_dev(dev);
1548 struct device_node *dn;
1549 const char *cp;
1550
1551 dn = dev->of_node;
1552 if (!dn) {
1553 strcpy(buf, "\n");
1554 return strlen(buf);
1555 }
1556 cp = of_get_property(dn, "compatible", NULL);
1557 if (!cp) {
1558 strcpy(buf, "\n");
1559 return strlen(buf);
1560 }
1561
1562 return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
1563}
1564
1565static struct device_attribute vio_dev_attrs[] = {
1566 __ATTR_RO(name),
1567 __ATTR_RO(devspec),
1568 __ATTR_RO(modalias),
1569 __ATTR_NULL
1570};
1571
1572void vio_unregister_device(struct vio_dev *viodev)
1573{
1574 device_unregister(&viodev->dev);
1575}
1576EXPORT_SYMBOL(vio_unregister_device);
1577
1578static int vio_bus_match(struct device *dev, struct device_driver *drv)
1579{
1580 const struct vio_dev *vio_dev = to_vio_dev(dev);
1581 struct vio_driver *vio_drv = to_vio_driver(drv);
1582 const struct vio_device_id *ids = vio_drv->id_table;
1583
1584 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
1585}
1586
1587static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
1588{
1589 const struct vio_dev *vio_dev = to_vio_dev(dev);
1590 struct device_node *dn;
1591 const char *cp;
1592
1593 dn = dev->of_node;
1594 if (!dn)
1595 return -ENODEV;
1596 cp = of_get_property(dn, "compatible", NULL);
1597 if (!cp)
1598 return -ENODEV;
1599
1600 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
1601 return 0;
1602}
1603
1604struct bus_type vio_bus_type = {
1605 .name = "vio",
1606 .dev_attrs = vio_dev_attrs,
1607 .uevent = vio_hotplug,
1608 .match = vio_bus_match,
1609 .probe = vio_bus_probe,
1610 .remove = vio_bus_remove,
1611};
1612
1613/**
1614 * vio_get_attribute: - get attribute for virtual device
1615 * @vdev: The vio device to get property.
1616 * @which: The property/attribute to be extracted.
1617 * @length: Pointer to length of returned data size (unused if NULL).
1618 *
1619 * Calls prom.c's of_get_property() to return the value of the
1620 * attribute specified by @which
1621*/
1622const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
1623{
1624 return of_get_property(vdev->dev.of_node, which, length);
1625}
1626EXPORT_SYMBOL(vio_get_attribute);
1627
1628#ifdef CONFIG_PPC_PSERIES
1629/* vio_find_name() - internal because only vio.c knows how we formatted the
1630 * kobject name
1631 */
1632static struct vio_dev *vio_find_name(const char *name)
1633{
1634 struct device *found;
1635
1636 found = bus_find_device_by_name(&vio_bus_type, NULL, name);
1637 if (!found)
1638 return NULL;
1639
1640 return to_vio_dev(found);
1641}
1642
1643/**
1644 * vio_find_node - find an already-registered vio_dev
1645 * @vnode: device_node of the virtual device we're looking for
1646 */
1647struct vio_dev *vio_find_node(struct device_node *vnode)
1648{
1649 char kobj_name[20];
1650 struct device_node *vnode_parent;
1651 const char *dev_type;
1652
1653 vnode_parent = of_get_parent(vnode);
1654 if (!vnode_parent)
1655 return NULL;
1656
1657 dev_type = of_get_property(vnode_parent, "device_type", NULL);
1658 of_node_put(vnode_parent);
1659 if (!dev_type)
1660 return NULL;
1661
1662 /* construct the kobject name from the device node */
1663 if (!strcmp(dev_type, "vdevice")) {
1664 const __be32 *prop;
1665
1666 prop = of_get_property(vnode, "reg", NULL);
1667 if (!prop)
1668 return NULL;
1669 snprintf(kobj_name, sizeof(kobj_name), "%x",
1670 (uint32_t)of_read_number(prop, 1));
1671 } else if (!strcmp(dev_type, "ibm,platform-facilities"))
1672 snprintf(kobj_name, sizeof(kobj_name), "%s", vnode->name);
1673 else
1674 return NULL;
1675
1676 return vio_find_name(kobj_name);
1677}
1678EXPORT_SYMBOL(vio_find_node);
1679
1680int vio_enable_interrupts(struct vio_dev *dev)
1681{
1682 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
1683 if (rc != H_SUCCESS)
1684 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
1685 return rc;
1686}
1687EXPORT_SYMBOL(vio_enable_interrupts);
1688
1689int vio_disable_interrupts(struct vio_dev *dev)
1690{
1691 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
1692 if (rc != H_SUCCESS)
1693 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
1694 return rc;
1695}
1696EXPORT_SYMBOL(vio_disable_interrupts);
1697#endif /* CONFIG_PPC_PSERIES */