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>
37 #include <asm/hvcall.h>
39 static struct vio_dev vio_bus_device = { /* fake "parent" device */
42 .dev.init_name = "vio",
43 .dev.bus = &vio_bus_type,
46 #ifdef CONFIG_PPC_SMLPAR
48 * vio_cmo_pool - A pool of IO memory for CMO use
50 * @size: The size of the pool in bytes
51 * @free: The amount of free memory in the pool
58 /* How many ms to delay queued balance work */
59 #define VIO_CMO_BALANCE_DELAY 100
61 /* Portion out IO memory to CMO devices by this chunk size */
62 #define VIO_CMO_BALANCE_CHUNK 131072
65 * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement
67 * @vio_dev: struct vio_dev pointer
68 * @list: pointer to other devices on bus that are being tracked
70 struct vio_cmo_dev_entry {
71 struct vio_dev *viodev;
72 struct list_head list;
76 * vio_cmo - VIO bus accounting structure for CMO entitlement
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
90 static struct vio_cmo {
92 struct delayed_work balance_q;
93 struct list_head device_list;
95 struct vio_cmo_pool reserve;
96 struct vio_cmo_pool excess;
105 * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows
107 static int vio_cmo_num_OF_devs(void)
109 struct device_node *node_vroot;
113 * Count the number of vdevice entries with an
114 * ibm,my-dma-window OF property
116 node_vroot = of_find_node_by_name(NULL, "vdevice");
118 struct device_node *of_node;
119 struct property *prop;
121 for_each_child_of_node(node_vroot, of_node) {
122 prop = of_find_property(of_node, "ibm,my-dma-window",
128 of_node_put(node_vroot);
133 * vio_cmo_alloc - allocate IO memory for CMO-enable devices
135 * @viodev: VIO device requesting IO memory
136 * @size: size of allocation requested
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
144 * 0 for successful allocation and -ENOMEM for a failure
146 static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size)
149 size_t reserve_free = 0;
150 size_t excess_free = 0;
153 spin_lock_irqsave(&vio_cmo.lock, flags);
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;
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;
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;
174 spin_unlock_irqrestore(&vio_cmo.lock, flags);
179 * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices
180 * @viodev: VIO device freeing IO memory
181 * @size: size of deallocation
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.
190 static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size)
193 size_t spare_needed = 0;
194 size_t excess_freed = 0;
195 size_t reserve_freed = size;
199 spin_lock_irqsave(&vio_cmo.lock, flags);
200 vio_cmo.curr -= size;
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;
209 /* Remove allocation from device */
210 viodev->cmo.allocated -= (reserve_freed + excess_freed);
212 /* Spare is a subset of the reserve pool, replenish it first. */
213 spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare;
216 * Replenish the spare in the reserve pool from the excess pool.
217 * This moves entitlement into the reserve pool.
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;
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.
235 if (spare_needed && reserve_freed) {
236 tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT));
238 vio_cmo.spare += tmp;
239 viodev->cmo.entitled -= tmp;
240 reserve_freed -= tmp;
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.
250 if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) {
251 tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size));
253 vio_cmo.excess.size -= tmp;
254 vio_cmo.reserve.size += tmp;
259 /* Return memory from the excess pool to that pool */
261 vio_cmo.excess.free += excess_freed;
264 schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY);
265 spin_unlock_irqrestore(&vio_cmo.lock, flags);
269 * vio_cmo_entitlement_update - Manage system entitlement changes
271 * @new_entitlement: new system entitlement to attempt to accommodate
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
277 * Returns: 0 on success, -ENOMEM when change can not be made
279 int vio_cmo_entitlement_update(size_t new_entitlement)
281 struct vio_dev *viodev;
282 struct vio_cmo_dev_entry *dev_ent;
284 size_t avail, delta, tmp;
286 spin_lock_irqsave(&vio_cmo.lock, flags);
288 /* Entitlement increases */
289 if (new_entitlement > vio_cmo.entitled) {
290 delta = new_entitlement - vio_cmo.entitled;
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;
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;
308 /* Entitlement decreases */
309 delta = vio_cmo.entitled - new_entitlement;
310 avail = vio_cmo.excess.free;
313 * Need to check how much unused entitlement each device can
314 * sacrifice to fulfill entitlement change.
316 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
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,
328 if (delta <= avail) {
329 vio_cmo.entitled -= delta;
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;
338 * Remove all but VIO_CMO_MIN_ENT bytes from devices
339 * until entitlement change is served
341 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
345 viodev = dev_ent->viodev;
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,
352 viodev->cmo.entitled -= min(tmp, delta);
353 delta -= min(tmp, delta);
356 spin_unlock_irqrestore(&vio_cmo.lock, flags);
361 schedule_delayed_work(&vio_cmo.balance_q, 0);
362 spin_unlock_irqrestore(&vio_cmo.lock, flags);
367 * vio_cmo_balance - Balance entitlement among devices
369 * @work: work queue structure for this operation
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.
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.
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.
387 static void vio_cmo_balance(struct work_struct *work)
390 struct vio_dev *viodev;
391 struct vio_cmo_dev_entry *dev_ent;
393 size_t avail = 0, level, chunk, need;
394 int devcount = 0, fulfilled;
396 cmo = container_of(work, struct vio_cmo, balance_q.work);
398 spin_lock_irqsave(&vio_cmo.lock, flags);
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;
408 * Determine how much entitlement is available and reset device
411 avail = cmo->entitled - cmo->spare;
412 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
413 viodev = dev_ent->viodev;
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);
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.
425 level = VIO_CMO_MIN_ENT;
428 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
429 viodev = dev_ent->viodev;
431 if (viodev->cmo.desired <= level) {
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.
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;
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.
451 need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
452 max(viodev->cmo.allocated, level);
456 if (fulfilled == devcount)
458 level += VIO_CMO_BALANCE_CHUNK;
461 /* Calculate new reserve and excess pool sizes */
462 cmo->reserve.size = cmo->min;
463 cmo->excess.free = 0;
464 cmo->excess.size = 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 -
472 /* Calculated used excess entitlement */
473 if (viodev->cmo.allocated > viodev->cmo.entitled)
474 need += viodev->cmo.allocated - viodev->cmo.entitled;
476 cmo->excess.size = cmo->entitled - cmo->reserve.size;
477 cmo->excess.free = cmo->excess.size - need;
479 cancel_delayed_work(to_delayed_work(work));
480 spin_unlock_irqrestore(&vio_cmo.lock, flags);
483 static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
484 dma_addr_t *dma_handle, gfp_t flag,
487 struct vio_dev *viodev = to_vio_dev(dev);
490 if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
491 atomic_inc(&viodev->cmo.allocs_failed);
495 ret = iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
496 dma_handle, dev->coherent_dma_mask, flag,
498 if (unlikely(ret == NULL)) {
499 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
500 atomic_inc(&viodev->cmo.allocs_failed);
506 static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
507 void *vaddr, dma_addr_t dma_handle,
510 struct vio_dev *viodev = to_vio_dev(dev);
512 iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle);
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,
521 struct vio_dev *viodev = to_vio_dev(dev);
522 struct iommu_table *tbl = get_iommu_table_base(dev);
523 dma_addr_t ret = DMA_MAPPING_ERROR;
525 if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl))))
527 ret = iommu_map_page(dev, tbl, page, offset, size, device_to_mask(dev),
529 if (unlikely(ret == DMA_MAPPING_ERROR))
534 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
536 atomic_inc(&viodev->cmo.allocs_failed);
537 return DMA_MAPPING_ERROR;
540 static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
542 enum dma_data_direction direction,
545 struct vio_dev *viodev = to_vio_dev(dev);
546 struct iommu_table *tbl = get_iommu_table_base(dev);
548 iommu_unmap_page(tbl, dma_handle, size, direction, attrs);
549 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
552 static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
553 int nelems, enum dma_data_direction direction,
556 struct vio_dev *viodev = to_vio_dev(dev);
557 struct iommu_table *tbl = get_iommu_table_base(dev);
558 struct scatterlist *sgl;
560 size_t alloc_size = 0;
562 for_each_sg(sglist, sgl, nelems, count)
563 alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
565 if (vio_cmo_alloc(viodev, alloc_size))
567 ret = ppc_iommu_map_sg(dev, tbl, sglist, nelems, device_to_mask(dev),
572 for_each_sg(sglist, sgl, ret, count)
573 alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
575 vio_cmo_dealloc(viodev, alloc_size);
579 vio_cmo_dealloc(viodev, alloc_size);
581 atomic_inc(&viodev->cmo.allocs_failed);
585 static void vio_dma_iommu_unmap_sg(struct device *dev,
586 struct scatterlist *sglist, int nelems,
587 enum dma_data_direction direction,
590 struct vio_dev *viodev = to_vio_dev(dev);
591 struct iommu_table *tbl = get_iommu_table_base(dev);
592 struct scatterlist *sgl;
593 size_t alloc_size = 0;
596 for_each_sg(sglist, sgl, nelems, count)
597 alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
599 ppc_iommu_unmap_sg(tbl, sglist, nelems, direction, attrs);
600 vio_cmo_dealloc(viodev, alloc_size);
603 static const struct dma_map_ops vio_dma_mapping_ops = {
604 .alloc = vio_dma_iommu_alloc_coherent,
605 .free = vio_dma_iommu_free_coherent,
606 .mmap = dma_nommu_mmap_coherent,
607 .map_sg = vio_dma_iommu_map_sg,
608 .unmap_sg = vio_dma_iommu_unmap_sg,
609 .map_page = vio_dma_iommu_map_page,
610 .unmap_page = vio_dma_iommu_unmap_page,
611 .dma_supported = dma_iommu_dma_supported,
612 .get_required_mask = dma_iommu_get_required_mask,
616 * vio_cmo_set_dev_desired - Set desired entitlement for a device
618 * @viodev: struct vio_dev for device to alter
619 * @desired: new desired entitlement level in bytes
621 * For use by devices to request a change to their entitlement at runtime or
622 * through sysfs. The desired entitlement level is changed and a balancing
623 * of system resources is scheduled to run in the future.
625 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired)
628 struct vio_cmo_dev_entry *dev_ent;
631 if (!firmware_has_feature(FW_FEATURE_CMO))
634 spin_lock_irqsave(&vio_cmo.lock, flags);
635 if (desired < VIO_CMO_MIN_ENT)
636 desired = VIO_CMO_MIN_ENT;
639 * Changes will not be made for devices not in the device list.
640 * If it is not in the device list, then no driver is loaded
641 * for the device and it can not receive entitlement.
643 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
644 if (viodev == dev_ent->viodev) {
649 spin_unlock_irqrestore(&vio_cmo.lock, flags);
653 /* Increase/decrease in desired device entitlement */
654 if (desired >= viodev->cmo.desired) {
655 /* Just bump the bus and device values prior to a balance*/
656 vio_cmo.desired += desired - viodev->cmo.desired;
657 viodev->cmo.desired = desired;
659 /* Decrease bus and device values for desired entitlement */
660 vio_cmo.desired -= viodev->cmo.desired - desired;
661 viodev->cmo.desired = desired;
663 * If less entitlement is desired than current entitlement, move
664 * any reserve memory in the change region to the excess pool.
666 if (viodev->cmo.entitled > desired) {
667 vio_cmo.reserve.size -= viodev->cmo.entitled - desired;
668 vio_cmo.excess.size += viodev->cmo.entitled - desired;
670 * If entitlement moving from the reserve pool to the
671 * excess pool is currently unused, add to the excess
674 if (viodev->cmo.allocated < viodev->cmo.entitled)
675 vio_cmo.excess.free += viodev->cmo.entitled -
676 max(viodev->cmo.allocated, desired);
677 viodev->cmo.entitled = desired;
680 schedule_delayed_work(&vio_cmo.balance_q, 0);
681 spin_unlock_irqrestore(&vio_cmo.lock, flags);
685 * vio_cmo_bus_probe - Handle CMO specific bus probe activities
687 * @viodev - Pointer to struct vio_dev for device
689 * Determine the devices IO memory entitlement needs, attempting
690 * to satisfy the system minimum entitlement at first and scheduling
691 * a balance operation to take care of the rest at a later time.
693 * Returns: 0 on success, -EINVAL when device doesn't support CMO, and
694 * -ENOMEM when entitlement is not available for device or
698 static int vio_cmo_bus_probe(struct vio_dev *viodev)
700 struct vio_cmo_dev_entry *dev_ent;
701 struct device *dev = &viodev->dev;
702 struct iommu_table *tbl;
703 struct vio_driver *viodrv = to_vio_driver(dev->driver);
706 bool dma_capable = false;
708 tbl = get_iommu_table_base(dev);
710 /* A device requires entitlement if it has a DMA window property */
711 switch (viodev->family) {
713 if (of_get_property(viodev->dev.of_node,
714 "ibm,my-dma-window", NULL))
721 dev_warn(dev, "unknown device family: %d\n", viodev->family);
726 /* Configure entitlement for the device. */
728 /* Check that the driver is CMO enabled and get desired DMA */
729 if (!viodrv->get_desired_dma) {
730 dev_err(dev, "%s: device driver does not support CMO\n",
735 viodev->cmo.desired =
736 IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev), tbl);
737 if (viodev->cmo.desired < VIO_CMO_MIN_ENT)
738 viodev->cmo.desired = VIO_CMO_MIN_ENT;
739 size = VIO_CMO_MIN_ENT;
741 dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry),
746 dev_ent->viodev = viodev;
747 spin_lock_irqsave(&vio_cmo.lock, flags);
748 list_add(&dev_ent->list, &vio_cmo.device_list);
750 viodev->cmo.desired = 0;
752 spin_lock_irqsave(&vio_cmo.lock, flags);
756 * If the needs for vio_cmo.min have not changed since they
757 * were last set, the number of devices in the OF tree has
758 * been constant and the IO memory for this is already in
761 if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) *
763 /* Updated desired entitlement if device requires it */
765 vio_cmo.desired += (viodev->cmo.desired -
770 tmp = vio_cmo.spare + vio_cmo.excess.free;
772 dev_err(dev, "%s: insufficient free "
773 "entitlement to add device. "
774 "Need %lu, have %lu\n", __func__,
775 size, (vio_cmo.spare + tmp));
776 spin_unlock_irqrestore(&vio_cmo.lock, flags);
780 /* Use excess pool first to fulfill request */
781 tmp = min(size, vio_cmo.excess.free);
782 vio_cmo.excess.free -= tmp;
783 vio_cmo.excess.size -= tmp;
784 vio_cmo.reserve.size += tmp;
786 /* Use spare if excess pool was insufficient */
787 vio_cmo.spare -= size - tmp;
789 /* Update bus accounting */
791 vio_cmo.desired += viodev->cmo.desired;
793 spin_unlock_irqrestore(&vio_cmo.lock, flags);
798 * vio_cmo_bus_remove - Handle CMO specific bus removal activities
800 * @viodev - Pointer to struct vio_dev for device
802 * Remove the device from the cmo device list. The minimum entitlement
803 * will be reserved for the device as long as it is in the system. The
804 * rest of the entitlement the device had been allocated will be returned
807 static void vio_cmo_bus_remove(struct vio_dev *viodev)
809 struct vio_cmo_dev_entry *dev_ent;
813 spin_lock_irqsave(&vio_cmo.lock, flags);
814 if (viodev->cmo.allocated) {
815 dev_err(&viodev->dev, "%s: device had %lu bytes of IO "
816 "allocated after remove operation.\n",
817 __func__, viodev->cmo.allocated);
822 * Remove the device from the device list being maintained for
823 * CMO enabled devices.
825 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
826 if (viodev == dev_ent->viodev) {
827 list_del(&dev_ent->list);
833 * Devices may not require any entitlement and they do not need
834 * to be processed. Otherwise, return the device's entitlement
837 if (viodev->cmo.entitled) {
839 * This device has not yet left the OF tree, it's
840 * minimum entitlement remains in vio_cmo.min and
843 vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT);
846 * Save min allocation for device in reserve as long
847 * as it exists in OF tree as determined by later
850 viodev->cmo.entitled -= VIO_CMO_MIN_ENT;
852 /* Replenish spare from freed reserve pool */
853 if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) {
854 tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT -
856 vio_cmo.spare += tmp;
857 viodev->cmo.entitled -= tmp;
860 /* Remaining reserve goes to excess pool */
861 vio_cmo.excess.size += viodev->cmo.entitled;
862 vio_cmo.excess.free += viodev->cmo.entitled;
863 vio_cmo.reserve.size -= viodev->cmo.entitled;
866 * Until the device is removed it will keep a
867 * minimum entitlement; this will guarantee that
868 * a module unload/load will result in a success.
870 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
871 viodev->cmo.desired = VIO_CMO_MIN_ENT;
872 atomic_set(&viodev->cmo.allocs_failed, 0);
875 spin_unlock_irqrestore(&vio_cmo.lock, flags);
878 static void vio_cmo_set_dma_ops(struct vio_dev *viodev)
880 set_dma_ops(&viodev->dev, &vio_dma_mapping_ops);
884 * vio_cmo_bus_init - CMO entitlement initialization at bus init time
886 * Set up the reserve and excess entitlement pools based on available
887 * system entitlement and the number of devices in the OF tree that
888 * require entitlement in the reserve pool.
890 static void vio_cmo_bus_init(void)
892 struct hvcall_mpp_data mpp_data;
895 memset(&vio_cmo, 0, sizeof(struct vio_cmo));
896 spin_lock_init(&vio_cmo.lock);
897 INIT_LIST_HEAD(&vio_cmo.device_list);
898 INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance);
900 /* Get current system entitlement */
901 err = h_get_mpp(&mpp_data);
904 * On failure, continue with entitlement set to 0, will panic()
905 * later when spare is reserved.
907 if (err != H_SUCCESS) {
908 printk(KERN_ERR "%s: unable to determine system IO "\
909 "entitlement. (%d)\n", __func__, err);
910 vio_cmo.entitled = 0;
912 vio_cmo.entitled = mpp_data.entitled_mem;
915 /* Set reservation and check against entitlement */
916 vio_cmo.spare = VIO_CMO_MIN_ENT;
917 vio_cmo.reserve.size = vio_cmo.spare;
918 vio_cmo.reserve.size += (vio_cmo_num_OF_devs() *
920 if (vio_cmo.reserve.size > vio_cmo.entitled) {
921 printk(KERN_ERR "%s: insufficient system entitlement\n",
923 panic("%s: Insufficient system entitlement", __func__);
926 /* Set the remaining accounting variables */
927 vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size;
928 vio_cmo.excess.free = vio_cmo.excess.size;
929 vio_cmo.min = vio_cmo.reserve.size;
930 vio_cmo.desired = vio_cmo.reserve.size;
933 /* sysfs device functions and data structures for CMO */
935 #define viodev_cmo_rd_attr(name) \
936 static ssize_t cmo_##name##_show(struct device *dev, \
937 struct device_attribute *attr, \
940 return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name); \
943 static ssize_t cmo_allocs_failed_show(struct device *dev,
944 struct device_attribute *attr, char *buf)
946 struct vio_dev *viodev = to_vio_dev(dev);
947 return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
950 static ssize_t cmo_allocs_failed_store(struct device *dev,
951 struct device_attribute *attr, const char *buf, size_t count)
953 struct vio_dev *viodev = to_vio_dev(dev);
954 atomic_set(&viodev->cmo.allocs_failed, 0);
958 static ssize_t cmo_desired_store(struct device *dev,
959 struct device_attribute *attr, const char *buf, size_t count)
961 struct vio_dev *viodev = to_vio_dev(dev);
965 ret = kstrtoul(buf, 10, &new_desired);
969 vio_cmo_set_dev_desired(viodev, new_desired);
973 viodev_cmo_rd_attr(desired);
974 viodev_cmo_rd_attr(entitled);
975 viodev_cmo_rd_attr(allocated);
977 static ssize_t name_show(struct device *, struct device_attribute *, char *);
978 static ssize_t devspec_show(struct device *, struct device_attribute *, char *);
979 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
982 static struct device_attribute dev_attr_name;
983 static struct device_attribute dev_attr_devspec;
984 static struct device_attribute dev_attr_modalias;
986 static DEVICE_ATTR_RO(cmo_entitled);
987 static DEVICE_ATTR_RO(cmo_allocated);
988 static DEVICE_ATTR_RW(cmo_desired);
989 static DEVICE_ATTR_RW(cmo_allocs_failed);
991 static struct attribute *vio_cmo_dev_attrs[] = {
993 &dev_attr_devspec.attr,
994 &dev_attr_modalias.attr,
995 &dev_attr_cmo_entitled.attr,
996 &dev_attr_cmo_allocated.attr,
997 &dev_attr_cmo_desired.attr,
998 &dev_attr_cmo_allocs_failed.attr,
1001 ATTRIBUTE_GROUPS(vio_cmo_dev);
1003 /* sysfs bus functions and data structures for CMO */
1005 #define viobus_cmo_rd_attr(name) \
1006 static ssize_t cmo_bus_##name##_show(struct bus_type *bt, char *buf) \
1008 return sprintf(buf, "%lu\n", vio_cmo.name); \
1010 static struct bus_attribute bus_attr_cmo_bus_##name = \
1011 __ATTR(cmo_##name, S_IRUGO, cmo_bus_##name##_show, NULL)
1013 #define viobus_cmo_pool_rd_attr(name, var) \
1015 cmo_##name##_##var##_show(struct bus_type *bt, char *buf) \
1017 return sprintf(buf, "%lu\n", vio_cmo.name.var); \
1019 static BUS_ATTR_RO(cmo_##name##_##var)
1021 viobus_cmo_rd_attr(entitled);
1022 viobus_cmo_rd_attr(spare);
1023 viobus_cmo_rd_attr(min);
1024 viobus_cmo_rd_attr(desired);
1025 viobus_cmo_rd_attr(curr);
1026 viobus_cmo_pool_rd_attr(reserve, size);
1027 viobus_cmo_pool_rd_attr(excess, size);
1028 viobus_cmo_pool_rd_attr(excess, free);
1030 static ssize_t cmo_high_show(struct bus_type *bt, char *buf)
1032 return sprintf(buf, "%lu\n", vio_cmo.high);
1035 static ssize_t cmo_high_store(struct bus_type *bt, const char *buf,
1038 unsigned long flags;
1040 spin_lock_irqsave(&vio_cmo.lock, flags);
1041 vio_cmo.high = vio_cmo.curr;
1042 spin_unlock_irqrestore(&vio_cmo.lock, flags);
1046 static BUS_ATTR_RW(cmo_high);
1048 static struct attribute *vio_bus_attrs[] = {
1049 &bus_attr_cmo_bus_entitled.attr,
1050 &bus_attr_cmo_bus_spare.attr,
1051 &bus_attr_cmo_bus_min.attr,
1052 &bus_attr_cmo_bus_desired.attr,
1053 &bus_attr_cmo_bus_curr.attr,
1054 &bus_attr_cmo_high.attr,
1055 &bus_attr_cmo_reserve_size.attr,
1056 &bus_attr_cmo_excess_size.attr,
1057 &bus_attr_cmo_excess_free.attr,
1060 ATTRIBUTE_GROUPS(vio_bus);
1062 static void vio_cmo_sysfs_init(void)
1064 vio_bus_type.dev_groups = vio_cmo_dev_groups;
1065 vio_bus_type.bus_groups = vio_bus_groups;
1067 #else /* CONFIG_PPC_SMLPAR */
1068 int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; }
1069 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {}
1070 static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; }
1071 static void vio_cmo_bus_remove(struct vio_dev *viodev) {}
1072 static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {}
1073 static void vio_cmo_bus_init(void) {}
1074 static void vio_cmo_sysfs_init(void) { }
1075 #endif /* CONFIG_PPC_SMLPAR */
1076 EXPORT_SYMBOL(vio_cmo_entitlement_update);
1077 EXPORT_SYMBOL(vio_cmo_set_dev_desired);
1081 * Platform Facilities Option (PFO) support
1085 * vio_h_cop_sync - Perform a synchronous PFO co-processor operation
1087 * @vdev - Pointer to a struct vio_dev for device
1088 * @op - Pointer to a struct vio_pfo_op for the operation parameters
1090 * Calls the hypervisor to synchronously perform the PFO operation
1091 * described in @op. In the case of a busy response from the hypervisor,
1092 * the operation will be re-submitted indefinitely unless a non-zero timeout
1093 * is specified or an error occurs. The timeout places a limit on when to
1094 * stop re-submitting a operation, the total time can be exceeded if an
1095 * operation is in progress.
1097 * If op->hcall_ret is not NULL, this will be set to the return from the
1098 * last h_cop_op call or it will be 0 if an error not involving the h_call
1103 * -EINVAL if the h_call fails due to an invalid parameter,
1104 * -E2BIG if the h_call can not be performed synchronously,
1105 * -EBUSY if a timeout is specified and has elapsed,
1106 * -EACCES if the memory area for data/status has been rescinded, or
1107 * -EPERM if a hardware fault has been indicated
1109 int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op)
1111 struct device *dev = &vdev->dev;
1112 unsigned long deadline = 0;
1117 deadline = jiffies + msecs_to_jiffies(op->timeout);
1120 hret = plpar_hcall_norets(H_COP, op->flags,
1122 op->in, op->inlen, op->out,
1123 op->outlen, op->csbcpb);
1125 if (hret == H_SUCCESS ||
1126 (hret != H_NOT_ENOUGH_RESOURCES &&
1127 hret != H_BUSY && hret != H_RESOURCE) ||
1128 (op->timeout && time_after(deadline, jiffies)))
1131 dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret);
1148 case H_NOT_ENOUGH_RESOURCES:
1159 dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n",
1160 __func__, ret, hret);
1162 op->hcall_err = hret;
1165 EXPORT_SYMBOL(vio_h_cop_sync);
1167 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
1169 const __be32 *dma_window;
1170 struct iommu_table *tbl;
1171 unsigned long offset, size;
1173 dma_window = of_get_property(dev->dev.of_node,
1174 "ibm,my-dma-window", NULL);
1178 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
1182 of_parse_dma_window(dev->dev.of_node, dma_window,
1183 &tbl->it_index, &offset, &size);
1185 /* TCE table size - measured in tce entries */
1186 tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
1187 tbl->it_size = size >> tbl->it_page_shift;
1188 /* offset for VIO should always be 0 */
1189 tbl->it_offset = offset >> tbl->it_page_shift;
1191 tbl->it_type = TCE_VB;
1192 tbl->it_blocksize = 16;
1194 if (firmware_has_feature(FW_FEATURE_LPAR))
1195 tbl->it_ops = &iommu_table_lpar_multi_ops;
1197 tbl->it_ops = &iommu_table_pseries_ops;
1199 return iommu_init_table(tbl, -1);
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
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.
1212 static const struct vio_device_id *vio_match_device(
1213 const struct vio_device_id *ids, const struct vio_dev *dev)
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,
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
1230 static int vio_bus_probe(struct device *dev)
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;
1240 id = vio_match_device(viodrv->id_table, viodev);
1242 memset(&viodev->cmo, 0, sizeof(viodev->cmo));
1243 if (firmware_has_feature(FW_FEATURE_CMO)) {
1244 error = vio_cmo_bus_probe(viodev);
1248 error = viodrv->probe(viodev, id);
1249 if (error && firmware_has_feature(FW_FEATURE_CMO))
1250 vio_cmo_bus_remove(viodev);
1256 /* convert from struct device to struct vio_dev and pass to driver. */
1257 static int vio_bus_remove(struct device *dev)
1259 struct vio_dev *viodev = to_vio_dev(dev);
1260 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1261 struct device *devptr;
1265 * Hold a reference to the device after the remove function is called
1266 * to allow for CMO accounting cleanup for the device.
1268 devptr = get_device(dev);
1271 ret = viodrv->remove(viodev);
1273 if (!ret && firmware_has_feature(FW_FEATURE_CMO))
1274 vio_cmo_bus_remove(viodev);
1281 * vio_register_driver: - Register a new vio driver
1282 * @viodrv: The vio_driver structure to be registered.
1284 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
1285 const char *mod_name)
1287 pr_debug("%s: driver %s registering\n", __func__, viodrv->name);
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;
1296 return driver_register(&viodrv->driver);
1298 EXPORT_SYMBOL(__vio_register_driver);
1301 * vio_unregister_driver - Remove registration of vio driver.
1302 * @viodrv: The vio_driver struct to be removed form registration
1304 void vio_unregister_driver(struct vio_driver *viodrv)
1306 driver_unregister(&viodrv->driver);
1308 EXPORT_SYMBOL(vio_unregister_driver);
1310 /* vio_dev refcount hit 0 */
1311 static void vio_dev_release(struct device *dev)
1313 struct iommu_table *tbl = get_iommu_table_base(dev);
1316 iommu_tce_table_put(tbl);
1317 of_node_put(dev->of_node);
1318 kfree(to_vio_dev(dev));
1322 * vio_register_device_node: - Register a new vio device.
1323 * @of_node: The OF node for this device.
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.
1330 struct vio_dev *vio_register_device_node(struct device_node *of_node)
1332 struct vio_dev *viodev;
1333 struct device_node *parent_node;
1335 enum vio_dev_family family;
1338 * Determine if this node is a under the /vdevice node or under the
1339 * /ibm,platform-facilities node. This decides the device's family.
1341 parent_node = of_get_parent(of_node);
1343 if (of_node_is_type(parent_node, "ibm,platform-facilities"))
1345 else if (of_node_is_type(parent_node, "vdevice"))
1348 pr_warn("%s: parent(%pOF) of %pOFn not recognized.\n",
1352 of_node_put(parent_node);
1355 of_node_put(parent_node);
1357 pr_warn("%s: could not determine the parent of node %pOFn.\n",
1362 if (family == PFO) {
1363 if (of_get_property(of_node, "interrupt-controller", NULL)) {
1364 pr_debug("%s: Skipping the interrupt controller %pOFn.\n",
1370 /* allocate a vio_dev for this node */
1371 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
1372 if (viodev == NULL) {
1373 pr_warn("%s: allocation failure for VIO device.\n", __func__);
1377 /* we need the 'device_type' property, in order to match with drivers */
1378 viodev->family = family;
1379 if (viodev->family == VDEVICE) {
1380 unsigned int unit_address;
1382 viodev->type = of_node_get_device_type(of_node);
1383 if (!viodev->type) {
1384 pr_warn("%s: node %pOFn is missing the 'device_type' "
1385 "property.\n", __func__, of_node);
1389 prop = of_get_property(of_node, "reg", NULL);
1391 pr_warn("%s: node %pOFn missing 'reg'\n",
1395 unit_address = of_read_number(prop, 1);
1396 dev_set_name(&viodev->dev, "%x", unit_address);
1397 viodev->irq = irq_of_parse_and_map(of_node, 0);
1398 viodev->unit_address = unit_address;
1400 /* PFO devices need their resource_id for submitting COP_OPs
1401 * This is an optional field for devices, but is required when
1402 * performing synchronous ops */
1403 prop = of_get_property(of_node, "ibm,resource-id", NULL);
1405 viodev->resource_id = of_read_number(prop, 1);
1407 dev_set_name(&viodev->dev, "%pOFn", of_node);
1408 viodev->type = dev_name(&viodev->dev);
1412 viodev->name = of_node->name;
1413 viodev->dev.of_node = of_node_get(of_node);
1415 set_dev_node(&viodev->dev, of_node_to_nid(of_node));
1417 /* init generic 'struct device' fields: */
1418 viodev->dev.parent = &vio_bus_device.dev;
1419 viodev->dev.bus = &vio_bus_type;
1420 viodev->dev.release = vio_dev_release;
1422 if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) {
1423 if (firmware_has_feature(FW_FEATURE_CMO))
1424 vio_cmo_set_dma_ops(viodev);
1426 set_dma_ops(&viodev->dev, &dma_iommu_ops);
1428 set_iommu_table_base(&viodev->dev,
1429 vio_build_iommu_table(viodev));
1431 /* needed to ensure proper operation of coherent allocations
1432 * later, in case driver doesn't set it explicitly */
1433 viodev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
1434 viodev->dev.dma_mask = &viodev->dev.coherent_dma_mask;
1437 /* register with generic device framework */
1438 if (device_register(&viodev->dev)) {
1439 printk(KERN_ERR "%s: failed to register device %s\n",
1440 __func__, dev_name(&viodev->dev));
1441 put_device(&viodev->dev);
1447 out: /* Use this exit point for any return prior to device_register */
1452 EXPORT_SYMBOL(vio_register_device_node);
1455 * vio_bus_scan_for_devices - Scan OF and register each child device
1456 * @root_name - OF node name for the root of the subtree to search.
1457 * This must be non-NULL
1459 * Starting from the root node provide, register the device node for
1460 * each child beneath the root.
1462 static void vio_bus_scan_register_devices(char *root_name)
1464 struct device_node *node_root, *node_child;
1469 node_root = of_find_node_by_name(NULL, root_name);
1473 * Create struct vio_devices for each virtual device in
1474 * the device tree. Drivers will associate with them later.
1476 node_child = of_get_next_child(node_root, NULL);
1477 while (node_child) {
1478 vio_register_device_node(node_child);
1479 node_child = of_get_next_child(node_root, node_child);
1481 of_node_put(node_root);
1486 * vio_bus_init: - Initialize the virtual IO bus
1488 static int __init vio_bus_init(void)
1492 if (firmware_has_feature(FW_FEATURE_CMO))
1493 vio_cmo_sysfs_init();
1495 err = bus_register(&vio_bus_type);
1497 printk(KERN_ERR "failed to register VIO bus\n");
1502 * The fake parent of all vio devices, just to give us
1505 err = device_register(&vio_bus_device.dev);
1507 printk(KERN_WARNING "%s: device_register returned %i\n",
1512 if (firmware_has_feature(FW_FEATURE_CMO))
1517 postcore_initcall(vio_bus_init);
1519 static int __init vio_device_init(void)
1521 vio_bus_scan_register_devices("vdevice");
1522 vio_bus_scan_register_devices("ibm,platform-facilities");
1526 device_initcall(vio_device_init);
1528 static ssize_t name_show(struct device *dev,
1529 struct device_attribute *attr, char *buf)
1531 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
1533 static DEVICE_ATTR_RO(name);
1535 static ssize_t devspec_show(struct device *dev,
1536 struct device_attribute *attr, char *buf)
1538 struct device_node *of_node = dev->of_node;
1540 return sprintf(buf, "%pOF\n", of_node);
1542 static DEVICE_ATTR_RO(devspec);
1544 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1547 const struct vio_dev *vio_dev = to_vio_dev(dev);
1548 struct device_node *dn;
1556 cp = of_get_property(dn, "compatible", NULL);
1562 return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
1564 static DEVICE_ATTR_RO(modalias);
1566 static struct attribute *vio_dev_attrs[] = {
1567 &dev_attr_name.attr,
1568 &dev_attr_devspec.attr,
1569 &dev_attr_modalias.attr,
1572 ATTRIBUTE_GROUPS(vio_dev);
1574 void vio_unregister_device(struct vio_dev *viodev)
1576 device_unregister(&viodev->dev);
1577 if (viodev->family == VDEVICE)
1578 irq_dispose_mapping(viodev->irq);
1580 EXPORT_SYMBOL(vio_unregister_device);
1582 static int vio_bus_match(struct device *dev, struct device_driver *drv)
1584 const struct vio_dev *vio_dev = to_vio_dev(dev);
1585 struct vio_driver *vio_drv = to_vio_driver(drv);
1586 const struct vio_device_id *ids = vio_drv->id_table;
1588 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
1591 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
1593 const struct vio_dev *vio_dev = to_vio_dev(dev);
1594 struct device_node *dn;
1600 cp = of_get_property(dn, "compatible", NULL);
1604 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
1608 struct bus_type vio_bus_type = {
1610 .dev_groups = vio_dev_groups,
1611 .uevent = vio_hotplug,
1612 .match = vio_bus_match,
1613 .probe = vio_bus_probe,
1614 .remove = vio_bus_remove,
1618 * vio_get_attribute: - get attribute for virtual device
1619 * @vdev: The vio device to get property.
1620 * @which: The property/attribute to be extracted.
1621 * @length: Pointer to length of returned data size (unused if NULL).
1623 * Calls prom.c's of_get_property() to return the value of the
1624 * attribute specified by @which
1626 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
1628 return of_get_property(vdev->dev.of_node, which, length);
1630 EXPORT_SYMBOL(vio_get_attribute);
1632 #ifdef CONFIG_PPC_PSERIES
1633 /* vio_find_name() - internal because only vio.c knows how we formatted the
1636 static struct vio_dev *vio_find_name(const char *name)
1638 struct device *found;
1640 found = bus_find_device_by_name(&vio_bus_type, NULL, name);
1644 return to_vio_dev(found);
1648 * vio_find_node - find an already-registered vio_dev
1649 * @vnode: device_node of the virtual device we're looking for
1651 * Takes a reference to the embedded struct device which needs to be dropped
1654 struct vio_dev *vio_find_node(struct device_node *vnode)
1657 struct device_node *vnode_parent;
1659 vnode_parent = of_get_parent(vnode);
1663 /* construct the kobject name from the device node */
1664 if (of_node_is_type(vnode_parent, "vdevice")) {
1667 prop = of_get_property(vnode, "reg", NULL);
1670 snprintf(kobj_name, sizeof(kobj_name), "%x",
1671 (uint32_t)of_read_number(prop, 1));
1672 } else if (of_node_is_type(vnode_parent, "ibm,platform-facilities"))
1673 snprintf(kobj_name, sizeof(kobj_name), "%pOFn", vnode);
1677 of_node_put(vnode_parent);
1678 return vio_find_name(kobj_name);
1680 of_node_put(vnode_parent);
1683 EXPORT_SYMBOL(vio_find_node);
1685 int vio_enable_interrupts(struct vio_dev *dev)
1687 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
1688 if (rc != H_SUCCESS)
1689 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
1692 EXPORT_SYMBOL(vio_enable_interrupts);
1694 int vio_disable_interrupts(struct vio_dev *dev)
1696 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
1697 if (rc != H_SUCCESS)
1698 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
1701 EXPORT_SYMBOL(vio_disable_interrupts);
1702 #endif /* CONFIG_PPC_PSERIES */