2 * IBM PowerPC Virtual I/O Infrastructure Support.
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>
9 * Robert Jennings <rcjenn@us.ibm.com>
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.
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>
27 #include <linux/dma-mapping.h>
28 #include <linux/kobject.h>
30 #include <asm/iommu.h>
34 #include <asm/firmware.h>
36 #include <asm/abs_addr.h>
38 #include <asm/hvcall.h>
40 static struct vio_dev vio_bus_device = { /* fake "parent" device */
43 .dev.init_name = "vio",
44 .dev.bus = &vio_bus_type,
47 #ifdef CONFIG_PPC_SMLPAR
49 * vio_cmo_pool - A pool of IO memory for CMO use
51 * @size: The size of the pool in bytes
52 * @free: The amount of free memory in the pool
59 /* How many ms to delay queued balance work */
60 #define VIO_CMO_BALANCE_DELAY 100
62 /* Portion out IO memory to CMO devices by this chunk size */
63 #define VIO_CMO_BALANCE_CHUNK 131072
66 * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement
68 * @vio_dev: struct vio_dev pointer
69 * @list: pointer to other devices on bus that are being tracked
71 struct vio_cmo_dev_entry {
72 struct vio_dev *viodev;
73 struct list_head list;
77 * vio_cmo - VIO bus accounting structure for CMO entitlement
79 * @lock: spinlock for entire structure
80 * @balance_q: work queue for balancing system entitlement
81 * @device_list: list of CMO-enabled devices requiring entitlement
82 * @entitled: total system entitlement in bytes
83 * @reserve: pool of memory from which devices reserve entitlement, incl. spare
84 * @excess: pool of excess entitlement not needed for device reserves or spare
85 * @spare: IO memory for device hotplug functionality
86 * @min: minimum necessary for system operation
87 * @desired: desired memory for system operation
88 * @curr: bytes currently allocated
89 * @high: high water mark for IO data usage
93 struct delayed_work balance_q;
94 struct list_head device_list;
96 struct vio_cmo_pool reserve;
97 struct vio_cmo_pool excess;
106 * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows
108 static int vio_cmo_num_OF_devs(void)
110 struct device_node *node_vroot;
114 * Count the number of vdevice entries with an
115 * ibm,my-dma-window OF property
117 node_vroot = of_find_node_by_name(NULL, "vdevice");
119 struct device_node *of_node;
120 struct property *prop;
122 for_each_child_of_node(node_vroot, of_node) {
123 prop = of_find_property(of_node, "ibm,my-dma-window",
129 of_node_put(node_vroot);
134 * vio_cmo_alloc - allocate IO memory for CMO-enable devices
136 * @viodev: VIO device requesting IO memory
137 * @size: size of allocation requested
139 * Allocations come from memory reserved for the devices and any excess
140 * IO memory available to all devices. The spare pool used to service
141 * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be
145 * 0 for successful allocation and -ENOMEM for a failure
147 static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size)
150 size_t reserve_free = 0;
151 size_t excess_free = 0;
154 spin_lock_irqsave(&vio_cmo.lock, flags);
156 /* Determine the amount of free entitlement available in reserve */
157 if (viodev->cmo.entitled > viodev->cmo.allocated)
158 reserve_free = viodev->cmo.entitled - viodev->cmo.allocated;
160 /* If spare is not fulfilled, the excess pool can not be used. */
161 if (vio_cmo.spare >= VIO_CMO_MIN_ENT)
162 excess_free = vio_cmo.excess.free;
164 /* The request can be satisfied */
165 if ((reserve_free + excess_free) >= size) {
166 vio_cmo.curr += size;
167 if (vio_cmo.curr > vio_cmo.high)
168 vio_cmo.high = vio_cmo.curr;
169 viodev->cmo.allocated += size;
170 size -= min(reserve_free, size);
171 vio_cmo.excess.free -= size;
175 spin_unlock_irqrestore(&vio_cmo.lock, flags);
180 * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices
181 * @viodev: VIO device freeing IO memory
182 * @size: size of deallocation
184 * IO memory is freed by the device back to the correct memory pools.
185 * The spare pool is replenished first from either memory pool, then
186 * the reserve pool is used to reduce device entitlement, the excess
187 * pool is used to increase the reserve pool toward the desired entitlement
188 * target, and then the remaining memory is returned to the pools.
191 static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size)
194 size_t spare_needed = 0;
195 size_t excess_freed = 0;
196 size_t reserve_freed = size;
200 spin_lock_irqsave(&vio_cmo.lock, flags);
201 vio_cmo.curr -= size;
203 /* Amount of memory freed from the excess pool */
204 if (viodev->cmo.allocated > viodev->cmo.entitled) {
205 excess_freed = min(reserve_freed, (viodev->cmo.allocated -
206 viodev->cmo.entitled));
207 reserve_freed -= excess_freed;
210 /* Remove allocation from device */
211 viodev->cmo.allocated -= (reserve_freed + excess_freed);
213 /* Spare is a subset of the reserve pool, replenish it first. */
214 spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare;
217 * Replenish the spare in the reserve pool from the excess pool.
218 * This moves entitlement into the reserve pool.
220 if (spare_needed && excess_freed) {
221 tmp = min(excess_freed, spare_needed);
222 vio_cmo.excess.size -= tmp;
223 vio_cmo.reserve.size += tmp;
224 vio_cmo.spare += tmp;
231 * Replenish the spare in the reserve pool from the reserve pool.
232 * This removes entitlement from the device down to VIO_CMO_MIN_ENT,
233 * if needed, and gives it to the spare pool. The amount of used
234 * memory in this pool does not change.
236 if (spare_needed && reserve_freed) {
237 tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT));
239 vio_cmo.spare += tmp;
240 viodev->cmo.entitled -= tmp;
241 reserve_freed -= tmp;
247 * Increase the reserve pool until the desired allocation is met.
248 * Move an allocation freed from the excess pool into the reserve
249 * pool and schedule a balance operation.
251 if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) {
252 tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size));
254 vio_cmo.excess.size -= tmp;
255 vio_cmo.reserve.size += tmp;
260 /* Return memory from the excess pool to that pool */
262 vio_cmo.excess.free += excess_freed;
265 schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY);
266 spin_unlock_irqrestore(&vio_cmo.lock, flags);
270 * vio_cmo_entitlement_update - Manage system entitlement changes
272 * @new_entitlement: new system entitlement to attempt to accommodate
274 * Increases in entitlement will be used to fulfill the spare entitlement
275 * and the rest is given to the excess pool. Decreases, if they are
276 * possible, come from the excess pool and from unused device entitlement
278 * Returns: 0 on success, -ENOMEM when change can not be made
280 int vio_cmo_entitlement_update(size_t new_entitlement)
282 struct vio_dev *viodev;
283 struct vio_cmo_dev_entry *dev_ent;
285 size_t avail, delta, tmp;
287 spin_lock_irqsave(&vio_cmo.lock, flags);
289 /* Entitlement increases */
290 if (new_entitlement > vio_cmo.entitled) {
291 delta = new_entitlement - vio_cmo.entitled;
293 /* Fulfill spare allocation */
294 if (vio_cmo.spare < VIO_CMO_MIN_ENT) {
295 tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare));
296 vio_cmo.spare += tmp;
297 vio_cmo.reserve.size += tmp;
301 /* Remaining new allocation goes to the excess pool */
302 vio_cmo.entitled += delta;
303 vio_cmo.excess.size += delta;
304 vio_cmo.excess.free += delta;
309 /* Entitlement decreases */
310 delta = vio_cmo.entitled - new_entitlement;
311 avail = vio_cmo.excess.free;
314 * Need to check how much unused entitlement each device can
315 * sacrifice to fulfill entitlement change.
317 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
321 viodev = dev_ent->viodev;
322 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
323 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
324 avail += viodev->cmo.entitled -
325 max_t(size_t, viodev->cmo.allocated,
329 if (delta <= avail) {
330 vio_cmo.entitled -= delta;
332 /* Take entitlement from the excess pool first */
333 tmp = min(vio_cmo.excess.free, delta);
334 vio_cmo.excess.size -= tmp;
335 vio_cmo.excess.free -= tmp;
339 * Remove all but VIO_CMO_MIN_ENT bytes from devices
340 * until entitlement change is served
342 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
346 viodev = dev_ent->viodev;
348 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
349 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
350 tmp = viodev->cmo.entitled -
351 max_t(size_t, viodev->cmo.allocated,
353 viodev->cmo.entitled -= min(tmp, delta);
354 delta -= min(tmp, delta);
357 spin_unlock_irqrestore(&vio_cmo.lock, flags);
362 schedule_delayed_work(&vio_cmo.balance_q, 0);
363 spin_unlock_irqrestore(&vio_cmo.lock, flags);
368 * vio_cmo_balance - Balance entitlement among devices
370 * @work: work queue structure for this operation
372 * Any system entitlement above the minimum needed for devices, or
373 * already allocated to devices, can be distributed to the devices.
374 * The list of devices is iterated through to recalculate the desired
375 * entitlement level and to determine how much entitlement above the
376 * minimum entitlement is allocated to devices.
378 * Small chunks of the available entitlement are given to devices until
379 * their requirements are fulfilled or there is no entitlement left to give.
380 * Upon completion sizes of the reserve and excess pools are calculated.
382 * The system minimum entitlement level is also recalculated here.
383 * Entitlement will be reserved for devices even after vio_bus_remove to
384 * accommodate reloading the driver. The OF tree is walked to count the
385 * number of devices present and this will remove entitlement for devices
386 * that have actually left the system after having vio_bus_remove called.
388 static void vio_cmo_balance(struct work_struct *work)
391 struct vio_dev *viodev;
392 struct vio_cmo_dev_entry *dev_ent;
394 size_t avail = 0, level, chunk, need;
395 int devcount = 0, fulfilled;
397 cmo = container_of(work, struct vio_cmo, balance_q.work);
399 spin_lock_irqsave(&vio_cmo.lock, flags);
401 /* Calculate minimum entitlement and fulfill spare */
402 cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT;
403 BUG_ON(cmo->min > cmo->entitled);
404 cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min));
405 cmo->min += cmo->spare;
406 cmo->desired = cmo->min;
409 * Determine how much entitlement is available and reset device
412 avail = cmo->entitled - cmo->spare;
413 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
414 viodev = dev_ent->viodev;
416 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
417 cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT);
418 avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT);
422 * Having provided each device with the minimum entitlement, loop
423 * over the devices portioning out the remaining entitlement
424 * until there is nothing left.
426 level = VIO_CMO_MIN_ENT;
429 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
430 viodev = dev_ent->viodev;
432 if (viodev->cmo.desired <= level) {
438 * Give the device up to VIO_CMO_BALANCE_CHUNK
439 * bytes of entitlement, but do not exceed the
440 * desired level of entitlement for the device.
442 chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK);
443 chunk = min(chunk, (viodev->cmo.desired -
444 viodev->cmo.entitled));
445 viodev->cmo.entitled += chunk;
448 * If the memory for this entitlement increase was
449 * already allocated to the device it does not come
450 * from the available pool being portioned out.
452 need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
453 max(viodev->cmo.allocated, level);
457 if (fulfilled == devcount)
459 level += VIO_CMO_BALANCE_CHUNK;
462 /* Calculate new reserve and excess pool sizes */
463 cmo->reserve.size = cmo->min;
464 cmo->excess.free = 0;
465 cmo->excess.size = 0;
467 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
468 viodev = dev_ent->viodev;
469 /* Calculated reserve size above the minimum entitlement */
470 if (viodev->cmo.entitled)
471 cmo->reserve.size += (viodev->cmo.entitled -
473 /* Calculated used excess entitlement */
474 if (viodev->cmo.allocated > viodev->cmo.entitled)
475 need += viodev->cmo.allocated - viodev->cmo.entitled;
477 cmo->excess.size = cmo->entitled - cmo->reserve.size;
478 cmo->excess.free = cmo->excess.size - need;
480 cancel_delayed_work(to_delayed_work(work));
481 spin_unlock_irqrestore(&vio_cmo.lock, flags);
484 static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
485 dma_addr_t *dma_handle, gfp_t flag,
486 struct dma_attrs *attrs)
488 struct vio_dev *viodev = to_vio_dev(dev);
491 if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
492 atomic_inc(&viodev->cmo.allocs_failed);
496 ret = dma_iommu_ops.alloc(dev, size, dma_handle, flag, attrs);
497 if (unlikely(ret == NULL)) {
498 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
499 atomic_inc(&viodev->cmo.allocs_failed);
505 static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
506 void *vaddr, dma_addr_t dma_handle,
507 struct dma_attrs *attrs)
509 struct vio_dev *viodev = to_vio_dev(dev);
511 dma_iommu_ops.free(dev, size, vaddr, dma_handle, attrs);
513 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
516 static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
517 unsigned long offset, size_t size,
518 enum dma_data_direction direction,
519 struct dma_attrs *attrs)
521 struct vio_dev *viodev = to_vio_dev(dev);
522 dma_addr_t ret = DMA_ERROR_CODE;
524 if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE))) {
525 atomic_inc(&viodev->cmo.allocs_failed);
529 ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs);
530 if (unlikely(dma_mapping_error(dev, ret))) {
531 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
532 atomic_inc(&viodev->cmo.allocs_failed);
538 static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
540 enum dma_data_direction direction,
541 struct dma_attrs *attrs)
543 struct vio_dev *viodev = to_vio_dev(dev);
545 dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs);
547 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
550 static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
551 int nelems, enum dma_data_direction direction,
552 struct dma_attrs *attrs)
554 struct vio_dev *viodev = to_vio_dev(dev);
555 struct scatterlist *sgl;
557 size_t alloc_size = 0;
559 for (sgl = sglist; count < nelems; count++, sgl++)
560 alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE);
562 if (vio_cmo_alloc(viodev, alloc_size)) {
563 atomic_inc(&viodev->cmo.allocs_failed);
567 ret = dma_iommu_ops.map_sg(dev, sglist, nelems, direction, attrs);
569 if (unlikely(!ret)) {
570 vio_cmo_dealloc(viodev, alloc_size);
571 atomic_inc(&viodev->cmo.allocs_failed);
575 for (sgl = sglist, count = 0; count < ret; count++, sgl++)
576 alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE);
578 vio_cmo_dealloc(viodev, alloc_size);
583 static void vio_dma_iommu_unmap_sg(struct device *dev,
584 struct scatterlist *sglist, int nelems,
585 enum dma_data_direction direction,
586 struct dma_attrs *attrs)
588 struct vio_dev *viodev = to_vio_dev(dev);
589 struct scatterlist *sgl;
590 size_t alloc_size = 0;
593 for (sgl = sglist; count < nelems; count++, sgl++)
594 alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE);
596 dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs);
598 vio_cmo_dealloc(viodev, alloc_size);
601 static int vio_dma_iommu_dma_supported(struct device *dev, u64 mask)
603 return dma_iommu_ops.dma_supported(dev, mask);
606 static u64 vio_dma_get_required_mask(struct device *dev)
608 return dma_iommu_ops.get_required_mask(dev);
611 struct dma_map_ops vio_dma_mapping_ops = {
612 .alloc = vio_dma_iommu_alloc_coherent,
613 .free = vio_dma_iommu_free_coherent,
614 .mmap = dma_direct_mmap_coherent,
615 .map_sg = vio_dma_iommu_map_sg,
616 .unmap_sg = vio_dma_iommu_unmap_sg,
617 .map_page = vio_dma_iommu_map_page,
618 .unmap_page = vio_dma_iommu_unmap_page,
619 .dma_supported = vio_dma_iommu_dma_supported,
620 .get_required_mask = vio_dma_get_required_mask,
624 * vio_cmo_set_dev_desired - Set desired entitlement for a device
626 * @viodev: struct vio_dev for device to alter
627 * @desired: new desired entitlement level in bytes
629 * For use by devices to request a change to their entitlement at runtime or
630 * through sysfs. The desired entitlement level is changed and a balancing
631 * of system resources is scheduled to run in the future.
633 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired)
636 struct vio_cmo_dev_entry *dev_ent;
639 if (!firmware_has_feature(FW_FEATURE_CMO))
642 spin_lock_irqsave(&vio_cmo.lock, flags);
643 if (desired < VIO_CMO_MIN_ENT)
644 desired = VIO_CMO_MIN_ENT;
647 * Changes will not be made for devices not in the device list.
648 * If it is not in the device list, then no driver is loaded
649 * for the device and it can not receive entitlement.
651 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
652 if (viodev == dev_ent->viodev) {
657 spin_unlock_irqrestore(&vio_cmo.lock, flags);
661 /* Increase/decrease in desired device entitlement */
662 if (desired >= viodev->cmo.desired) {
663 /* Just bump the bus and device values prior to a balance*/
664 vio_cmo.desired += desired - viodev->cmo.desired;
665 viodev->cmo.desired = desired;
667 /* Decrease bus and device values for desired entitlement */
668 vio_cmo.desired -= viodev->cmo.desired - desired;
669 viodev->cmo.desired = desired;
671 * If less entitlement is desired than current entitlement, move
672 * any reserve memory in the change region to the excess pool.
674 if (viodev->cmo.entitled > desired) {
675 vio_cmo.reserve.size -= viodev->cmo.entitled - desired;
676 vio_cmo.excess.size += viodev->cmo.entitled - desired;
678 * If entitlement moving from the reserve pool to the
679 * excess pool is currently unused, add to the excess
682 if (viodev->cmo.allocated < viodev->cmo.entitled)
683 vio_cmo.excess.free += viodev->cmo.entitled -
684 max(viodev->cmo.allocated, desired);
685 viodev->cmo.entitled = desired;
688 schedule_delayed_work(&vio_cmo.balance_q, 0);
689 spin_unlock_irqrestore(&vio_cmo.lock, flags);
693 * vio_cmo_bus_probe - Handle CMO specific bus probe activities
695 * @viodev - Pointer to struct vio_dev for device
697 * Determine the devices IO memory entitlement needs, attempting
698 * to satisfy the system minimum entitlement at first and scheduling
699 * a balance operation to take care of the rest at a later time.
701 * Returns: 0 on success, -EINVAL when device doesn't support CMO, and
702 * -ENOMEM when entitlement is not available for device or
706 static int vio_cmo_bus_probe(struct vio_dev *viodev)
708 struct vio_cmo_dev_entry *dev_ent;
709 struct device *dev = &viodev->dev;
710 struct vio_driver *viodrv = to_vio_driver(dev->driver);
713 bool dma_capable = false;
715 /* A device requires entitlement if it has a DMA window property */
716 switch (viodev->family) {
718 if (of_get_property(viodev->dev.of_node,
719 "ibm,my-dma-window", NULL))
726 dev_warn(dev, "unknown device family: %d\n", viodev->family);
731 /* Configure entitlement for the device. */
733 /* Check that the driver is CMO enabled and get desired DMA */
734 if (!viodrv->get_desired_dma) {
735 dev_err(dev, "%s: device driver does not support CMO\n",
740 viodev->cmo.desired = IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev));
741 if (viodev->cmo.desired < VIO_CMO_MIN_ENT)
742 viodev->cmo.desired = VIO_CMO_MIN_ENT;
743 size = VIO_CMO_MIN_ENT;
745 dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry),
750 dev_ent->viodev = viodev;
751 spin_lock_irqsave(&vio_cmo.lock, flags);
752 list_add(&dev_ent->list, &vio_cmo.device_list);
754 viodev->cmo.desired = 0;
756 spin_lock_irqsave(&vio_cmo.lock, flags);
760 * If the needs for vio_cmo.min have not changed since they
761 * were last set, the number of devices in the OF tree has
762 * been constant and the IO memory for this is already in
765 if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) *
767 /* Updated desired entitlement if device requires it */
769 vio_cmo.desired += (viodev->cmo.desired -
774 tmp = vio_cmo.spare + vio_cmo.excess.free;
776 dev_err(dev, "%s: insufficient free "
777 "entitlement to add device. "
778 "Need %lu, have %lu\n", __func__,
779 size, (vio_cmo.spare + tmp));
780 spin_unlock_irqrestore(&vio_cmo.lock, flags);
784 /* Use excess pool first to fulfill request */
785 tmp = min(size, vio_cmo.excess.free);
786 vio_cmo.excess.free -= tmp;
787 vio_cmo.excess.size -= tmp;
788 vio_cmo.reserve.size += tmp;
790 /* Use spare if excess pool was insufficient */
791 vio_cmo.spare -= size - tmp;
793 /* Update bus accounting */
795 vio_cmo.desired += viodev->cmo.desired;
797 spin_unlock_irqrestore(&vio_cmo.lock, flags);
802 * vio_cmo_bus_remove - Handle CMO specific bus removal activities
804 * @viodev - Pointer to struct vio_dev for device
806 * Remove the device from the cmo device list. The minimum entitlement
807 * will be reserved for the device as long as it is in the system. The
808 * rest of the entitlement the device had been allocated will be returned
811 static void vio_cmo_bus_remove(struct vio_dev *viodev)
813 struct vio_cmo_dev_entry *dev_ent;
817 spin_lock_irqsave(&vio_cmo.lock, flags);
818 if (viodev->cmo.allocated) {
819 dev_err(&viodev->dev, "%s: device had %lu bytes of IO "
820 "allocated after remove operation.\n",
821 __func__, viodev->cmo.allocated);
826 * Remove the device from the device list being maintained for
827 * CMO enabled devices.
829 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
830 if (viodev == dev_ent->viodev) {
831 list_del(&dev_ent->list);
837 * Devices may not require any entitlement and they do not need
838 * to be processed. Otherwise, return the device's entitlement
841 if (viodev->cmo.entitled) {
843 * This device has not yet left the OF tree, it's
844 * minimum entitlement remains in vio_cmo.min and
847 vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT);
850 * Save min allocation for device in reserve as long
851 * as it exists in OF tree as determined by later
854 viodev->cmo.entitled -= VIO_CMO_MIN_ENT;
856 /* Replenish spare from freed reserve pool */
857 if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) {
858 tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT -
860 vio_cmo.spare += tmp;
861 viodev->cmo.entitled -= tmp;
864 /* Remaining reserve goes to excess pool */
865 vio_cmo.excess.size += viodev->cmo.entitled;
866 vio_cmo.excess.free += viodev->cmo.entitled;
867 vio_cmo.reserve.size -= viodev->cmo.entitled;
870 * Until the device is removed it will keep a
871 * minimum entitlement; this will guarantee that
872 * a module unload/load will result in a success.
874 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
875 viodev->cmo.desired = VIO_CMO_MIN_ENT;
876 atomic_set(&viodev->cmo.allocs_failed, 0);
879 spin_unlock_irqrestore(&vio_cmo.lock, flags);
882 static void vio_cmo_set_dma_ops(struct vio_dev *viodev)
884 set_dma_ops(&viodev->dev, &vio_dma_mapping_ops);
888 * vio_cmo_bus_init - CMO entitlement initialization at bus init time
890 * Set up the reserve and excess entitlement pools based on available
891 * system entitlement and the number of devices in the OF tree that
892 * require entitlement in the reserve pool.
894 static void vio_cmo_bus_init(void)
896 struct hvcall_mpp_data mpp_data;
899 memset(&vio_cmo, 0, sizeof(struct vio_cmo));
900 spin_lock_init(&vio_cmo.lock);
901 INIT_LIST_HEAD(&vio_cmo.device_list);
902 INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance);
904 /* Get current system entitlement */
905 err = h_get_mpp(&mpp_data);
908 * On failure, continue with entitlement set to 0, will panic()
909 * later when spare is reserved.
911 if (err != H_SUCCESS) {
912 printk(KERN_ERR "%s: unable to determine system IO "\
913 "entitlement. (%d)\n", __func__, err);
914 vio_cmo.entitled = 0;
916 vio_cmo.entitled = mpp_data.entitled_mem;
919 /* Set reservation and check against entitlement */
920 vio_cmo.spare = VIO_CMO_MIN_ENT;
921 vio_cmo.reserve.size = vio_cmo.spare;
922 vio_cmo.reserve.size += (vio_cmo_num_OF_devs() *
924 if (vio_cmo.reserve.size > vio_cmo.entitled) {
925 printk(KERN_ERR "%s: insufficient system entitlement\n",
927 panic("%s: Insufficient system entitlement", __func__);
930 /* Set the remaining accounting variables */
931 vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size;
932 vio_cmo.excess.free = vio_cmo.excess.size;
933 vio_cmo.min = vio_cmo.reserve.size;
934 vio_cmo.desired = vio_cmo.reserve.size;
937 /* sysfs device functions and data structures for CMO */
939 #define viodev_cmo_rd_attr(name) \
940 static ssize_t viodev_cmo_##name##_show(struct device *dev, \
941 struct device_attribute *attr, \
944 return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name); \
947 static ssize_t viodev_cmo_allocs_failed_show(struct device *dev,
948 struct device_attribute *attr, char *buf)
950 struct vio_dev *viodev = to_vio_dev(dev);
951 return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
954 static ssize_t viodev_cmo_allocs_failed_reset(struct device *dev,
955 struct device_attribute *attr, const char *buf, size_t count)
957 struct vio_dev *viodev = to_vio_dev(dev);
958 atomic_set(&viodev->cmo.allocs_failed, 0);
962 static ssize_t viodev_cmo_desired_set(struct device *dev,
963 struct device_attribute *attr, const char *buf, size_t count)
965 struct vio_dev *viodev = to_vio_dev(dev);
969 ret = strict_strtoul(buf, 10, &new_desired);
973 vio_cmo_set_dev_desired(viodev, new_desired);
977 viodev_cmo_rd_attr(desired);
978 viodev_cmo_rd_attr(entitled);
979 viodev_cmo_rd_attr(allocated);
981 static ssize_t name_show(struct device *, struct device_attribute *, char *);
982 static ssize_t devspec_show(struct device *, struct device_attribute *, char *);
983 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
985 static struct device_attribute vio_cmo_dev_attrs[] = {
989 __ATTR(cmo_desired, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
990 viodev_cmo_desired_show, viodev_cmo_desired_set),
991 __ATTR(cmo_entitled, S_IRUGO, viodev_cmo_entitled_show, NULL),
992 __ATTR(cmo_allocated, S_IRUGO, viodev_cmo_allocated_show, NULL),
993 __ATTR(cmo_allocs_failed, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
994 viodev_cmo_allocs_failed_show, viodev_cmo_allocs_failed_reset),
998 /* sysfs bus functions and data structures for CMO */
1000 #define viobus_cmo_rd_attr(name) \
1002 viobus_cmo_##name##_show(struct bus_type *bt, char *buf) \
1004 return sprintf(buf, "%lu\n", vio_cmo.name); \
1007 #define viobus_cmo_pool_rd_attr(name, var) \
1009 viobus_cmo_##name##_pool_show_##var(struct bus_type *bt, char *buf) \
1011 return sprintf(buf, "%lu\n", vio_cmo.name.var); \
1014 static ssize_t viobus_cmo_high_reset(struct bus_type *bt, const char *buf,
1017 unsigned long flags;
1019 spin_lock_irqsave(&vio_cmo.lock, flags);
1020 vio_cmo.high = vio_cmo.curr;
1021 spin_unlock_irqrestore(&vio_cmo.lock, flags);
1026 viobus_cmo_rd_attr(entitled);
1027 viobus_cmo_pool_rd_attr(reserve, size);
1028 viobus_cmo_pool_rd_attr(excess, size);
1029 viobus_cmo_pool_rd_attr(excess, free);
1030 viobus_cmo_rd_attr(spare);
1031 viobus_cmo_rd_attr(min);
1032 viobus_cmo_rd_attr(desired);
1033 viobus_cmo_rd_attr(curr);
1034 viobus_cmo_rd_attr(high);
1036 static struct bus_attribute vio_cmo_bus_attrs[] = {
1037 __ATTR(cmo_entitled, S_IRUGO, viobus_cmo_entitled_show, NULL),
1038 __ATTR(cmo_reserve_size, S_IRUGO, viobus_cmo_reserve_pool_show_size, NULL),
1039 __ATTR(cmo_excess_size, S_IRUGO, viobus_cmo_excess_pool_show_size, NULL),
1040 __ATTR(cmo_excess_free, S_IRUGO, viobus_cmo_excess_pool_show_free, NULL),
1041 __ATTR(cmo_spare, S_IRUGO, viobus_cmo_spare_show, NULL),
1042 __ATTR(cmo_min, S_IRUGO, viobus_cmo_min_show, NULL),
1043 __ATTR(cmo_desired, S_IRUGO, viobus_cmo_desired_show, NULL),
1044 __ATTR(cmo_curr, S_IRUGO, viobus_cmo_curr_show, NULL),
1045 __ATTR(cmo_high, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
1046 viobus_cmo_high_show, viobus_cmo_high_reset),
1050 static void vio_cmo_sysfs_init(void)
1052 vio_bus_type.dev_attrs = vio_cmo_dev_attrs;
1053 vio_bus_type.bus_attrs = vio_cmo_bus_attrs;
1055 #else /* CONFIG_PPC_SMLPAR */
1056 int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; }
1057 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {}
1058 static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; }
1059 static void vio_cmo_bus_remove(struct vio_dev *viodev) {}
1060 static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {}
1061 static void vio_cmo_bus_init(void) {}
1062 static void vio_cmo_sysfs_init(void) { }
1063 #endif /* CONFIG_PPC_SMLPAR */
1064 EXPORT_SYMBOL(vio_cmo_entitlement_update);
1065 EXPORT_SYMBOL(vio_cmo_set_dev_desired);
1069 * Platform Facilities Option (PFO) support
1073 * vio_h_cop_sync - Perform a synchronous PFO co-processor operation
1075 * @vdev - Pointer to a struct vio_dev for device
1076 * @op - Pointer to a struct vio_pfo_op for the operation parameters
1078 * Calls the hypervisor to synchronously perform the PFO operation
1079 * described in @op. In the case of a busy response from the hypervisor,
1080 * the operation will be re-submitted indefinitely unless a non-zero timeout
1081 * is specified or an error occurs. The timeout places a limit on when to
1082 * stop re-submitting a operation, the total time can be exceeded if an
1083 * operation is in progress.
1085 * If op->hcall_ret is not NULL, this will be set to the return from the
1086 * last h_cop_op call or it will be 0 if an error not involving the h_call
1091 * -EINVAL if the h_call fails due to an invalid parameter,
1092 * -E2BIG if the h_call can not be performed synchronously,
1093 * -EBUSY if a timeout is specified and has elapsed,
1094 * -EACCES if the memory area for data/status has been rescinded, or
1095 * -EPERM if a hardware fault has been indicated
1097 int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op)
1099 struct device *dev = &vdev->dev;
1100 unsigned long deadline = 0;
1105 deadline = jiffies + msecs_to_jiffies(op->timeout);
1108 hret = plpar_hcall_norets(H_COP, op->flags,
1110 op->in, op->inlen, op->out,
1111 op->outlen, op->csbcpb);
1113 if (hret == H_SUCCESS ||
1114 (hret != H_NOT_ENOUGH_RESOURCES &&
1115 hret != H_BUSY && hret != H_RESOURCE) ||
1116 (op->timeout && time_after(deadline, jiffies)))
1119 dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret);
1136 case H_NOT_ENOUGH_RESOURCES:
1147 dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n",
1148 __func__, ret, hret);
1150 op->hcall_err = hret;
1153 EXPORT_SYMBOL(vio_h_cop_sync);
1155 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
1157 const unsigned char *dma_window;
1158 struct iommu_table *tbl;
1159 unsigned long offset, size;
1161 dma_window = of_get_property(dev->dev.of_node,
1162 "ibm,my-dma-window", NULL);
1166 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
1170 of_parse_dma_window(dev->dev.of_node, dma_window,
1171 &tbl->it_index, &offset, &size);
1173 /* TCE table size - measured in tce entries */
1174 tbl->it_size = size >> IOMMU_PAGE_SHIFT;
1175 /* offset for VIO should always be 0 */
1176 tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
1178 tbl->it_type = TCE_VB;
1179 tbl->it_blocksize = 16;
1181 return iommu_init_table(tbl, -1);
1185 * vio_match_device: - Tell if a VIO device has a matching
1186 * VIO device id structure.
1187 * @ids: array of VIO device id structures to search in
1188 * @dev: the VIO device structure to match against
1190 * Used by a driver to check whether a VIO device present in the
1191 * system is in its list of supported devices. Returns the matching
1192 * vio_device_id structure or NULL if there is no match.
1194 static const struct vio_device_id *vio_match_device(
1195 const struct vio_device_id *ids, const struct vio_dev *dev)
1197 while (ids->type[0] != '\0') {
1198 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
1199 of_device_is_compatible(dev->dev.of_node,
1208 * Convert from struct device to struct vio_dev and pass to driver.
1209 * dev->driver has already been set by generic code because vio_bus_match
1212 static int vio_bus_probe(struct device *dev)
1214 struct vio_dev *viodev = to_vio_dev(dev);
1215 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1216 const struct vio_device_id *id;
1217 int error = -ENODEV;
1222 id = vio_match_device(viodrv->id_table, viodev);
1224 memset(&viodev->cmo, 0, sizeof(viodev->cmo));
1225 if (firmware_has_feature(FW_FEATURE_CMO)) {
1226 error = vio_cmo_bus_probe(viodev);
1230 error = viodrv->probe(viodev, id);
1231 if (error && firmware_has_feature(FW_FEATURE_CMO))
1232 vio_cmo_bus_remove(viodev);
1238 /* convert from struct device to struct vio_dev and pass to driver. */
1239 static int vio_bus_remove(struct device *dev)
1241 struct vio_dev *viodev = to_vio_dev(dev);
1242 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1243 struct device *devptr;
1247 * Hold a reference to the device after the remove function is called
1248 * to allow for CMO accounting cleanup for the device.
1250 devptr = get_device(dev);
1253 ret = viodrv->remove(viodev);
1255 if (!ret && firmware_has_feature(FW_FEATURE_CMO))
1256 vio_cmo_bus_remove(viodev);
1263 * vio_register_driver: - Register a new vio driver
1264 * @viodrv: The vio_driver structure to be registered.
1266 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
1267 const char *mod_name)
1269 pr_debug("%s: driver %s registering\n", __func__, viodrv->name);
1271 /* fill in 'struct driver' fields */
1272 viodrv->driver.name = viodrv->name;
1273 viodrv->driver.pm = viodrv->pm;
1274 viodrv->driver.bus = &vio_bus_type;
1275 viodrv->driver.owner = owner;
1276 viodrv->driver.mod_name = mod_name;
1278 return driver_register(&viodrv->driver);
1280 EXPORT_SYMBOL(__vio_register_driver);
1283 * vio_unregister_driver - Remove registration of vio driver.
1284 * @viodrv: The vio_driver struct to be removed form registration
1286 void vio_unregister_driver(struct vio_driver *viodrv)
1288 driver_unregister(&viodrv->driver);
1290 EXPORT_SYMBOL(vio_unregister_driver);
1292 /* vio_dev refcount hit 0 */
1293 static void __devinit vio_dev_release(struct device *dev)
1295 struct iommu_table *tbl = get_iommu_table_base(dev);
1298 iommu_free_table(tbl, of_node_full_name(dev->of_node));
1299 of_node_put(dev->of_node);
1300 kfree(to_vio_dev(dev));
1304 * vio_register_device_node: - Register a new vio device.
1305 * @of_node: The OF node for this device.
1307 * Creates and initializes a vio_dev structure from the data in
1308 * of_node and adds it to the list of virtual devices.
1309 * Returns a pointer to the created vio_dev or NULL if node has
1310 * NULL device_type or compatible fields.
1312 struct vio_dev *vio_register_device_node(struct device_node *of_node)
1314 struct vio_dev *viodev;
1315 struct device_node *parent_node;
1316 const unsigned int *unit_address;
1317 const unsigned int *pfo_resid = NULL;
1318 enum vio_dev_family family;
1319 const char *of_node_name = of_node->name ? of_node->name : "<unknown>";
1322 * Determine if this node is a under the /vdevice node or under the
1323 * /ibm,platform-facilities node. This decides the device's family.
1325 parent_node = of_get_parent(of_node);
1327 if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
1329 else if (!strcmp(parent_node->full_name, "/vdevice"))
1332 pr_warn("%s: parent(%s) of %s not recognized.\n",
1334 parent_node->full_name,
1336 of_node_put(parent_node);
1339 of_node_put(parent_node);
1341 pr_warn("%s: could not determine the parent of node %s.\n",
1342 __func__, of_node_name);
1346 if (family == PFO) {
1347 if (of_get_property(of_node, "interrupt-controller", NULL)) {
1348 pr_debug("%s: Skipping the interrupt controller %s.\n",
1349 __func__, of_node_name);
1354 /* allocate a vio_dev for this node */
1355 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
1356 if (viodev == NULL) {
1357 pr_warn("%s: allocation failure for VIO device.\n", __func__);
1361 /* we need the 'device_type' property, in order to match with drivers */
1362 viodev->family = family;
1363 if (viodev->family == VDEVICE) {
1364 if (of_node->type != NULL)
1365 viodev->type = of_node->type;
1367 pr_warn("%s: node %s is missing the 'device_type' "
1368 "property.\n", __func__, of_node_name);
1372 unit_address = of_get_property(of_node, "reg", NULL);
1373 if (unit_address == NULL) {
1374 pr_warn("%s: node %s missing 'reg'\n",
1375 __func__, of_node_name);
1378 dev_set_name(&viodev->dev, "%x", *unit_address);
1379 viodev->irq = irq_of_parse_and_map(of_node, 0);
1380 viodev->unit_address = *unit_address;
1382 /* PFO devices need their resource_id for submitting COP_OPs
1383 * This is an optional field for devices, but is required when
1384 * performing synchronous ops */
1385 pfo_resid = of_get_property(of_node, "ibm,resource-id", NULL);
1386 if (pfo_resid != NULL)
1387 viodev->resource_id = *pfo_resid;
1389 unit_address = NULL;
1390 dev_set_name(&viodev->dev, "%s", of_node_name);
1391 viodev->type = of_node_name;
1395 viodev->name = of_node->name;
1396 viodev->dev.of_node = of_node_get(of_node);
1398 set_dev_node(&viodev->dev, of_node_to_nid(of_node));
1400 /* init generic 'struct device' fields: */
1401 viodev->dev.parent = &vio_bus_device.dev;
1402 viodev->dev.bus = &vio_bus_type;
1403 viodev->dev.release = vio_dev_release;
1405 if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) {
1406 if (firmware_has_feature(FW_FEATURE_CMO))
1407 vio_cmo_set_dma_ops(viodev);
1409 set_dma_ops(&viodev->dev, &dma_iommu_ops);
1411 set_iommu_table_base(&viodev->dev,
1412 vio_build_iommu_table(viodev));
1414 /* needed to ensure proper operation of coherent allocations
1415 * later, in case driver doesn't set it explicitly */
1416 dma_set_mask(&viodev->dev, DMA_BIT_MASK(64));
1417 dma_set_coherent_mask(&viodev->dev, DMA_BIT_MASK(64));
1420 /* register with generic device framework */
1421 if (device_register(&viodev->dev)) {
1422 printk(KERN_ERR "%s: failed to register device %s\n",
1423 __func__, dev_name(&viodev->dev));
1424 put_device(&viodev->dev);
1430 out: /* Use this exit point for any return prior to device_register */
1435 EXPORT_SYMBOL(vio_register_device_node);
1438 * vio_bus_scan_for_devices - Scan OF and register each child device
1439 * @root_name - OF node name for the root of the subtree to search.
1440 * This must be non-NULL
1442 * Starting from the root node provide, register the device node for
1443 * each child beneath the root.
1445 static void vio_bus_scan_register_devices(char *root_name)
1447 struct device_node *node_root, *node_child;
1452 node_root = of_find_node_by_name(NULL, root_name);
1456 * Create struct vio_devices for each virtual device in
1457 * the device tree. Drivers will associate with them later.
1459 node_child = of_get_next_child(node_root, NULL);
1460 while (node_child) {
1461 vio_register_device_node(node_child);
1462 node_child = of_get_next_child(node_root, node_child);
1464 of_node_put(node_root);
1469 * vio_bus_init: - Initialize the virtual IO bus
1471 static int __init vio_bus_init(void)
1475 if (firmware_has_feature(FW_FEATURE_CMO))
1476 vio_cmo_sysfs_init();
1478 err = bus_register(&vio_bus_type);
1480 printk(KERN_ERR "failed to register VIO bus\n");
1485 * The fake parent of all vio devices, just to give us
1488 err = device_register(&vio_bus_device.dev);
1490 printk(KERN_WARNING "%s: device_register returned %i\n",
1495 if (firmware_has_feature(FW_FEATURE_CMO))
1500 postcore_initcall(vio_bus_init);
1502 static int __init vio_device_init(void)
1504 vio_bus_scan_register_devices("vdevice");
1505 vio_bus_scan_register_devices("ibm,platform-facilities");
1509 device_initcall(vio_device_init);
1511 static ssize_t name_show(struct device *dev,
1512 struct device_attribute *attr, char *buf)
1514 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
1517 static ssize_t devspec_show(struct device *dev,
1518 struct device_attribute *attr, char *buf)
1520 struct device_node *of_node = dev->of_node;
1522 return sprintf(buf, "%s\n", of_node_full_name(of_node));
1525 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1528 const struct vio_dev *vio_dev = to_vio_dev(dev);
1529 struct device_node *dn;
1535 cp = of_get_property(dn, "compatible", NULL);
1539 return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
1542 static struct device_attribute vio_dev_attrs[] = {
1545 __ATTR_RO(modalias),
1549 void __devinit vio_unregister_device(struct vio_dev *viodev)
1551 device_unregister(&viodev->dev);
1553 EXPORT_SYMBOL(vio_unregister_device);
1555 static int vio_bus_match(struct device *dev, struct device_driver *drv)
1557 const struct vio_dev *vio_dev = to_vio_dev(dev);
1558 struct vio_driver *vio_drv = to_vio_driver(drv);
1559 const struct vio_device_id *ids = vio_drv->id_table;
1561 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
1564 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
1566 const struct vio_dev *vio_dev = to_vio_dev(dev);
1567 struct device_node *dn;
1573 cp = of_get_property(dn, "compatible", NULL);
1577 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
1581 struct bus_type vio_bus_type = {
1583 .dev_attrs = vio_dev_attrs,
1584 .uevent = vio_hotplug,
1585 .match = vio_bus_match,
1586 .probe = vio_bus_probe,
1587 .remove = vio_bus_remove,
1591 * vio_get_attribute: - get attribute for virtual device
1592 * @vdev: The vio device to get property.
1593 * @which: The property/attribute to be extracted.
1594 * @length: Pointer to length of returned data size (unused if NULL).
1596 * Calls prom.c's of_get_property() to return the value of the
1597 * attribute specified by @which
1599 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
1601 return of_get_property(vdev->dev.of_node, which, length);
1603 EXPORT_SYMBOL(vio_get_attribute);
1605 #ifdef CONFIG_PPC_PSERIES
1606 /* vio_find_name() - internal because only vio.c knows how we formatted the
1609 static struct vio_dev *vio_find_name(const char *name)
1611 struct device *found;
1613 found = bus_find_device_by_name(&vio_bus_type, NULL, name);
1617 return to_vio_dev(found);
1621 * vio_find_node - find an already-registered vio_dev
1622 * @vnode: device_node of the virtual device we're looking for
1624 struct vio_dev *vio_find_node(struct device_node *vnode)
1626 const uint32_t *unit_address;
1628 struct device_node *vnode_parent;
1629 const char *dev_type;
1631 vnode_parent = of_get_parent(vnode);
1635 dev_type = of_get_property(vnode_parent, "device_type", NULL);
1636 of_node_put(vnode_parent);
1640 /* construct the kobject name from the device node */
1641 if (!strcmp(dev_type, "vdevice")) {
1642 unit_address = of_get_property(vnode, "reg", NULL);
1645 snprintf(kobj_name, sizeof(kobj_name), "%x", *unit_address);
1646 } else if (!strcmp(dev_type, "ibm,platform-facilities"))
1647 snprintf(kobj_name, sizeof(kobj_name), "%s", vnode->name);
1651 return vio_find_name(kobj_name);
1653 EXPORT_SYMBOL(vio_find_node);
1655 int vio_enable_interrupts(struct vio_dev *dev)
1657 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
1658 if (rc != H_SUCCESS)
1659 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
1662 EXPORT_SYMBOL(vio_enable_interrupts);
1664 int vio_disable_interrupts(struct vio_dev *dev)
1666 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
1667 if (rc != H_SUCCESS)
1668 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
1671 EXPORT_SYMBOL(vio_disable_interrupts);
1672 #endif /* CONFIG_PPC_PSERIES */