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 bus_type vio_bus_type;
42 static struct vio_dev vio_bus_device = { /* fake "parent" device */
45 .dev.init_name = "vio",
46 .dev.bus = &vio_bus_type,
49 #ifdef CONFIG_PPC_SMLPAR
51 * vio_cmo_pool - A pool of IO memory for CMO use
53 * @size: The size of the pool in bytes
54 * @free: The amount of free memory in the pool
61 /* How many ms to delay queued balance work */
62 #define VIO_CMO_BALANCE_DELAY 100
64 /* Portion out IO memory to CMO devices by this chunk size */
65 #define VIO_CMO_BALANCE_CHUNK 131072
68 * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement
70 * @vio_dev: struct vio_dev pointer
71 * @list: pointer to other devices on bus that are being tracked
73 struct vio_cmo_dev_entry {
74 struct vio_dev *viodev;
75 struct list_head list;
79 * vio_cmo - VIO bus accounting structure for CMO entitlement
81 * @lock: spinlock for entire structure
82 * @balance_q: work queue for balancing system entitlement
83 * @device_list: list of CMO-enabled devices requiring entitlement
84 * @entitled: total system entitlement in bytes
85 * @reserve: pool of memory from which devices reserve entitlement, incl. spare
86 * @excess: pool of excess entitlement not needed for device reserves or spare
87 * @spare: IO memory for device hotplug functionality
88 * @min: minimum necessary for system operation
89 * @desired: desired memory for system operation
90 * @curr: bytes currently allocated
91 * @high: high water mark for IO data usage
95 struct delayed_work balance_q;
96 struct list_head device_list;
98 struct vio_cmo_pool reserve;
99 struct vio_cmo_pool excess;
108 * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows
110 static int vio_cmo_num_OF_devs(void)
112 struct device_node *node_vroot;
116 * Count the number of vdevice entries with an
117 * ibm,my-dma-window OF property
119 node_vroot = of_find_node_by_name(NULL, "vdevice");
121 struct device_node *of_node;
122 struct property *prop;
124 for_each_child_of_node(node_vroot, of_node) {
125 prop = of_find_property(of_node, "ibm,my-dma-window",
131 of_node_put(node_vroot);
136 * vio_cmo_alloc - allocate IO memory for CMO-enable devices
138 * @viodev: VIO device requesting IO memory
139 * @size: size of allocation requested
141 * Allocations come from memory reserved for the devices and any excess
142 * IO memory available to all devices. The spare pool used to service
143 * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be
147 * 0 for successful allocation and -ENOMEM for a failure
149 static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size)
152 size_t reserve_free = 0;
153 size_t excess_free = 0;
156 spin_lock_irqsave(&vio_cmo.lock, flags);
158 /* Determine the amount of free entitlement available in reserve */
159 if (viodev->cmo.entitled > viodev->cmo.allocated)
160 reserve_free = viodev->cmo.entitled - viodev->cmo.allocated;
162 /* If spare is not fulfilled, the excess pool can not be used. */
163 if (vio_cmo.spare >= VIO_CMO_MIN_ENT)
164 excess_free = vio_cmo.excess.free;
166 /* The request can be satisfied */
167 if ((reserve_free + excess_free) >= size) {
168 vio_cmo.curr += size;
169 if (vio_cmo.curr > vio_cmo.high)
170 vio_cmo.high = vio_cmo.curr;
171 viodev->cmo.allocated += size;
172 size -= min(reserve_free, size);
173 vio_cmo.excess.free -= size;
177 spin_unlock_irqrestore(&vio_cmo.lock, flags);
182 * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices
183 * @viodev: VIO device freeing IO memory
184 * @size: size of deallocation
186 * IO memory is freed by the device back to the correct memory pools.
187 * The spare pool is replenished first from either memory pool, then
188 * the reserve pool is used to reduce device entitlement, the excess
189 * pool is used to increase the reserve pool toward the desired entitlement
190 * target, and then the remaining memory is returned to the pools.
193 static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size)
196 size_t spare_needed = 0;
197 size_t excess_freed = 0;
198 size_t reserve_freed = size;
202 spin_lock_irqsave(&vio_cmo.lock, flags);
203 vio_cmo.curr -= size;
205 /* Amount of memory freed from the excess pool */
206 if (viodev->cmo.allocated > viodev->cmo.entitled) {
207 excess_freed = min(reserve_freed, (viodev->cmo.allocated -
208 viodev->cmo.entitled));
209 reserve_freed -= excess_freed;
212 /* Remove allocation from device */
213 viodev->cmo.allocated -= (reserve_freed + excess_freed);
215 /* Spare is a subset of the reserve pool, replenish it first. */
216 spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare;
219 * Replenish the spare in the reserve pool from the excess pool.
220 * This moves entitlement into the reserve pool.
222 if (spare_needed && excess_freed) {
223 tmp = min(excess_freed, spare_needed);
224 vio_cmo.excess.size -= tmp;
225 vio_cmo.reserve.size += tmp;
226 vio_cmo.spare += tmp;
233 * Replenish the spare in the reserve pool from the reserve pool.
234 * This removes entitlement from the device down to VIO_CMO_MIN_ENT,
235 * if needed, and gives it to the spare pool. The amount of used
236 * memory in this pool does not change.
238 if (spare_needed && reserve_freed) {
239 tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT));
241 vio_cmo.spare += tmp;
242 viodev->cmo.entitled -= tmp;
243 reserve_freed -= tmp;
249 * Increase the reserve pool until the desired allocation is met.
250 * Move an allocation freed from the excess pool into the reserve
251 * pool and schedule a balance operation.
253 if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) {
254 tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size));
256 vio_cmo.excess.size -= tmp;
257 vio_cmo.reserve.size += tmp;
262 /* Return memory from the excess pool to that pool */
264 vio_cmo.excess.free += excess_freed;
267 schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY);
268 spin_unlock_irqrestore(&vio_cmo.lock, flags);
272 * vio_cmo_entitlement_update - Manage system entitlement changes
274 * @new_entitlement: new system entitlement to attempt to accommodate
276 * Increases in entitlement will be used to fulfill the spare entitlement
277 * and the rest is given to the excess pool. Decreases, if they are
278 * possible, come from the excess pool and from unused device entitlement
280 * Returns: 0 on success, -ENOMEM when change can not be made
282 int vio_cmo_entitlement_update(size_t new_entitlement)
284 struct vio_dev *viodev;
285 struct vio_cmo_dev_entry *dev_ent;
287 size_t avail, delta, tmp;
289 spin_lock_irqsave(&vio_cmo.lock, flags);
291 /* Entitlement increases */
292 if (new_entitlement > vio_cmo.entitled) {
293 delta = new_entitlement - vio_cmo.entitled;
295 /* Fulfill spare allocation */
296 if (vio_cmo.spare < VIO_CMO_MIN_ENT) {
297 tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare));
298 vio_cmo.spare += tmp;
299 vio_cmo.reserve.size += tmp;
303 /* Remaining new allocation goes to the excess pool */
304 vio_cmo.entitled += delta;
305 vio_cmo.excess.size += delta;
306 vio_cmo.excess.free += delta;
311 /* Entitlement decreases */
312 delta = vio_cmo.entitled - new_entitlement;
313 avail = vio_cmo.excess.free;
316 * Need to check how much unused entitlement each device can
317 * sacrifice to fulfill entitlement change.
319 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
323 viodev = dev_ent->viodev;
324 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
325 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
326 avail += viodev->cmo.entitled -
327 max_t(size_t, viodev->cmo.allocated,
331 if (delta <= avail) {
332 vio_cmo.entitled -= delta;
334 /* Take entitlement from the excess pool first */
335 tmp = min(vio_cmo.excess.free, delta);
336 vio_cmo.excess.size -= tmp;
337 vio_cmo.excess.free -= tmp;
341 * Remove all but VIO_CMO_MIN_ENT bytes from devices
342 * until entitlement change is served
344 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
348 viodev = dev_ent->viodev;
350 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
351 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
352 tmp = viodev->cmo.entitled -
353 max_t(size_t, viodev->cmo.allocated,
355 viodev->cmo.entitled -= min(tmp, delta);
356 delta -= min(tmp, delta);
359 spin_unlock_irqrestore(&vio_cmo.lock, flags);
364 schedule_delayed_work(&vio_cmo.balance_q, 0);
365 spin_unlock_irqrestore(&vio_cmo.lock, flags);
370 * vio_cmo_balance - Balance entitlement among devices
372 * @work: work queue structure for this operation
374 * Any system entitlement above the minimum needed for devices, or
375 * already allocated to devices, can be distributed to the devices.
376 * The list of devices is iterated through to recalculate the desired
377 * entitlement level and to determine how much entitlement above the
378 * minimum entitlement is allocated to devices.
380 * Small chunks of the available entitlement are given to devices until
381 * their requirements are fulfilled or there is no entitlement left to give.
382 * Upon completion sizes of the reserve and excess pools are calculated.
384 * The system minimum entitlement level is also recalculated here.
385 * Entitlement will be reserved for devices even after vio_bus_remove to
386 * accommodate reloading the driver. The OF tree is walked to count the
387 * number of devices present and this will remove entitlement for devices
388 * that have actually left the system after having vio_bus_remove called.
390 static void vio_cmo_balance(struct work_struct *work)
393 struct vio_dev *viodev;
394 struct vio_cmo_dev_entry *dev_ent;
396 size_t avail = 0, level, chunk, need;
397 int devcount = 0, fulfilled;
399 cmo = container_of(work, struct vio_cmo, balance_q.work);
401 spin_lock_irqsave(&vio_cmo.lock, flags);
403 /* Calculate minimum entitlement and fulfill spare */
404 cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT;
405 BUG_ON(cmo->min > cmo->entitled);
406 cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min));
407 cmo->min += cmo->spare;
408 cmo->desired = cmo->min;
411 * Determine how much entitlement is available and reset device
414 avail = cmo->entitled - cmo->spare;
415 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
416 viodev = dev_ent->viodev;
418 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
419 cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT);
420 avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT);
424 * Having provided each device with the minimum entitlement, loop
425 * over the devices portioning out the remaining entitlement
426 * until there is nothing left.
428 level = VIO_CMO_MIN_ENT;
431 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
432 viodev = dev_ent->viodev;
434 if (viodev->cmo.desired <= level) {
440 * Give the device up to VIO_CMO_BALANCE_CHUNK
441 * bytes of entitlement, but do not exceed the
442 * desired level of entitlement for the device.
444 chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK);
445 chunk = min(chunk, (viodev->cmo.desired -
446 viodev->cmo.entitled));
447 viodev->cmo.entitled += chunk;
450 * If the memory for this entitlement increase was
451 * already allocated to the device it does not come
452 * from the available pool being portioned out.
454 need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
455 max(viodev->cmo.allocated, level);
459 if (fulfilled == devcount)
461 level += VIO_CMO_BALANCE_CHUNK;
464 /* Calculate new reserve and excess pool sizes */
465 cmo->reserve.size = cmo->min;
466 cmo->excess.free = 0;
467 cmo->excess.size = 0;
469 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
470 viodev = dev_ent->viodev;
471 /* Calculated reserve size above the minimum entitlement */
472 if (viodev->cmo.entitled)
473 cmo->reserve.size += (viodev->cmo.entitled -
475 /* Calculated used excess entitlement */
476 if (viodev->cmo.allocated > viodev->cmo.entitled)
477 need += viodev->cmo.allocated - viodev->cmo.entitled;
479 cmo->excess.size = cmo->entitled - cmo->reserve.size;
480 cmo->excess.free = cmo->excess.size - need;
482 cancel_delayed_work(to_delayed_work(work));
483 spin_unlock_irqrestore(&vio_cmo.lock, flags);
486 static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
487 dma_addr_t *dma_handle, gfp_t flag,
488 struct dma_attrs *attrs)
490 struct vio_dev *viodev = to_vio_dev(dev);
493 if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
494 atomic_inc(&viodev->cmo.allocs_failed);
498 ret = dma_iommu_ops.alloc(dev, size, dma_handle, flag, attrs);
499 if (unlikely(ret == NULL)) {
500 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
501 atomic_inc(&viodev->cmo.allocs_failed);
507 static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
508 void *vaddr, dma_addr_t dma_handle,
509 struct dma_attrs *attrs)
511 struct vio_dev *viodev = to_vio_dev(dev);
513 dma_iommu_ops.free(dev, size, vaddr, dma_handle, attrs);
515 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
518 static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
519 unsigned long offset, size_t size,
520 enum dma_data_direction direction,
521 struct dma_attrs *attrs)
523 struct vio_dev *viodev = to_vio_dev(dev);
524 dma_addr_t ret = DMA_ERROR_CODE;
526 if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE))) {
527 atomic_inc(&viodev->cmo.allocs_failed);
531 ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs);
532 if (unlikely(dma_mapping_error(dev, ret))) {
533 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
534 atomic_inc(&viodev->cmo.allocs_failed);
540 static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
542 enum dma_data_direction direction,
543 struct dma_attrs *attrs)
545 struct vio_dev *viodev = to_vio_dev(dev);
547 dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs);
549 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
552 static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
553 int nelems, enum dma_data_direction direction,
554 struct dma_attrs *attrs)
556 struct vio_dev *viodev = to_vio_dev(dev);
557 struct scatterlist *sgl;
559 size_t alloc_size = 0;
561 for (sgl = sglist; count < nelems; count++, sgl++)
562 alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE);
564 if (vio_cmo_alloc(viodev, alloc_size)) {
565 atomic_inc(&viodev->cmo.allocs_failed);
569 ret = dma_iommu_ops.map_sg(dev, sglist, nelems, direction, attrs);
571 if (unlikely(!ret)) {
572 vio_cmo_dealloc(viodev, alloc_size);
573 atomic_inc(&viodev->cmo.allocs_failed);
577 for (sgl = sglist, count = 0; count < ret; count++, sgl++)
578 alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE);
580 vio_cmo_dealloc(viodev, alloc_size);
585 static void vio_dma_iommu_unmap_sg(struct device *dev,
586 struct scatterlist *sglist, int nelems,
587 enum dma_data_direction direction,
588 struct dma_attrs *attrs)
590 struct vio_dev *viodev = to_vio_dev(dev);
591 struct scatterlist *sgl;
592 size_t alloc_size = 0;
595 for (sgl = sglist; count < nelems; count++, sgl++)
596 alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE);
598 dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs);
600 vio_cmo_dealloc(viodev, alloc_size);
603 static int vio_dma_iommu_dma_supported(struct device *dev, u64 mask)
605 return dma_iommu_ops.dma_supported(dev, mask);
608 static u64 vio_dma_get_required_mask(struct device *dev)
610 return dma_iommu_ops.get_required_mask(dev);
613 struct dma_map_ops vio_dma_mapping_ops = {
614 .alloc = vio_dma_iommu_alloc_coherent,
615 .free = vio_dma_iommu_free_coherent,
616 .mmap = dma_direct_mmap_coherent,
617 .map_sg = vio_dma_iommu_map_sg,
618 .unmap_sg = vio_dma_iommu_unmap_sg,
619 .map_page = vio_dma_iommu_map_page,
620 .unmap_page = vio_dma_iommu_unmap_page,
621 .dma_supported = vio_dma_iommu_dma_supported,
622 .get_required_mask = vio_dma_get_required_mask,
626 * vio_cmo_set_dev_desired - Set desired entitlement for a device
628 * @viodev: struct vio_dev for device to alter
629 * @new_desired: new desired entitlement level in bytes
631 * For use by devices to request a change to their entitlement at runtime or
632 * through sysfs. The desired entitlement level is changed and a balancing
633 * of system resources is scheduled to run in the future.
635 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired)
638 struct vio_cmo_dev_entry *dev_ent;
641 if (!firmware_has_feature(FW_FEATURE_CMO))
644 spin_lock_irqsave(&vio_cmo.lock, flags);
645 if (desired < VIO_CMO_MIN_ENT)
646 desired = VIO_CMO_MIN_ENT;
649 * Changes will not be made for devices not in the device list.
650 * If it is not in the device list, then no driver is loaded
651 * for the device and it can not receive entitlement.
653 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
654 if (viodev == dev_ent->viodev) {
659 spin_unlock_irqrestore(&vio_cmo.lock, flags);
663 /* Increase/decrease in desired device entitlement */
664 if (desired >= viodev->cmo.desired) {
665 /* Just bump the bus and device values prior to a balance*/
666 vio_cmo.desired += desired - viodev->cmo.desired;
667 viodev->cmo.desired = desired;
669 /* Decrease bus and device values for desired entitlement */
670 vio_cmo.desired -= viodev->cmo.desired - desired;
671 viodev->cmo.desired = desired;
673 * If less entitlement is desired than current entitlement, move
674 * any reserve memory in the change region to the excess pool.
676 if (viodev->cmo.entitled > desired) {
677 vio_cmo.reserve.size -= viodev->cmo.entitled - desired;
678 vio_cmo.excess.size += viodev->cmo.entitled - desired;
680 * If entitlement moving from the reserve pool to the
681 * excess pool is currently unused, add to the excess
684 if (viodev->cmo.allocated < viodev->cmo.entitled)
685 vio_cmo.excess.free += viodev->cmo.entitled -
686 max(viodev->cmo.allocated, desired);
687 viodev->cmo.entitled = desired;
690 schedule_delayed_work(&vio_cmo.balance_q, 0);
691 spin_unlock_irqrestore(&vio_cmo.lock, flags);
695 * vio_cmo_bus_probe - Handle CMO specific bus probe activities
697 * @viodev - Pointer to struct vio_dev for device
699 * Determine the devices IO memory entitlement needs, attempting
700 * to satisfy the system minimum entitlement at first and scheduling
701 * a balance operation to take care of the rest at a later time.
703 * Returns: 0 on success, -EINVAL when device doesn't support CMO, and
704 * -ENOMEM when entitlement is not available for device or
708 static int vio_cmo_bus_probe(struct vio_dev *viodev)
710 struct vio_cmo_dev_entry *dev_ent;
711 struct device *dev = &viodev->dev;
712 struct vio_driver *viodrv = to_vio_driver(dev->driver);
715 bool dma_capable = false;
717 /* A device requires entitlement if it has a DMA window property */
718 switch (viodev->family) {
720 if (of_get_property(viodev->dev.of_node,
721 "ibm,my-dma-window", NULL))
728 dev_warn(dev, "unknown device family: %d\n", viodev->family);
733 /* Configure entitlement for the device. */
735 /* Check that the driver is CMO enabled and get desired DMA */
736 if (!viodrv->get_desired_dma) {
737 dev_err(dev, "%s: device driver does not support CMO\n",
742 viodev->cmo.desired = IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev));
743 if (viodev->cmo.desired < VIO_CMO_MIN_ENT)
744 viodev->cmo.desired = VIO_CMO_MIN_ENT;
745 size = VIO_CMO_MIN_ENT;
747 dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry),
752 dev_ent->viodev = viodev;
753 spin_lock_irqsave(&vio_cmo.lock, flags);
754 list_add(&dev_ent->list, &vio_cmo.device_list);
756 viodev->cmo.desired = 0;
758 spin_lock_irqsave(&vio_cmo.lock, flags);
762 * If the needs for vio_cmo.min have not changed since they
763 * were last set, the number of devices in the OF tree has
764 * been constant and the IO memory for this is already in
767 if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) *
769 /* Updated desired entitlement if device requires it */
771 vio_cmo.desired += (viodev->cmo.desired -
776 tmp = vio_cmo.spare + vio_cmo.excess.free;
778 dev_err(dev, "%s: insufficient free "
779 "entitlement to add device. "
780 "Need %lu, have %lu\n", __func__,
781 size, (vio_cmo.spare + tmp));
782 spin_unlock_irqrestore(&vio_cmo.lock, flags);
786 /* Use excess pool first to fulfill request */
787 tmp = min(size, vio_cmo.excess.free);
788 vio_cmo.excess.free -= tmp;
789 vio_cmo.excess.size -= tmp;
790 vio_cmo.reserve.size += tmp;
792 /* Use spare if excess pool was insufficient */
793 vio_cmo.spare -= size - tmp;
795 /* Update bus accounting */
797 vio_cmo.desired += viodev->cmo.desired;
799 spin_unlock_irqrestore(&vio_cmo.lock, flags);
804 * vio_cmo_bus_remove - Handle CMO specific bus removal activities
806 * @viodev - Pointer to struct vio_dev for device
808 * Remove the device from the cmo device list. The minimum entitlement
809 * will be reserved for the device as long as it is in the system. The
810 * rest of the entitlement the device had been allocated will be returned
813 static void vio_cmo_bus_remove(struct vio_dev *viodev)
815 struct vio_cmo_dev_entry *dev_ent;
819 spin_lock_irqsave(&vio_cmo.lock, flags);
820 if (viodev->cmo.allocated) {
821 dev_err(&viodev->dev, "%s: device had %lu bytes of IO "
822 "allocated after remove operation.\n",
823 __func__, viodev->cmo.allocated);
828 * Remove the device from the device list being maintained for
829 * CMO enabled devices.
831 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
832 if (viodev == dev_ent->viodev) {
833 list_del(&dev_ent->list);
839 * Devices may not require any entitlement and they do not need
840 * to be processed. Otherwise, return the device's entitlement
843 if (viodev->cmo.entitled) {
845 * This device has not yet left the OF tree, it's
846 * minimum entitlement remains in vio_cmo.min and
849 vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT);
852 * Save min allocation for device in reserve as long
853 * as it exists in OF tree as determined by later
856 viodev->cmo.entitled -= VIO_CMO_MIN_ENT;
858 /* Replenish spare from freed reserve pool */
859 if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) {
860 tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT -
862 vio_cmo.spare += tmp;
863 viodev->cmo.entitled -= tmp;
866 /* Remaining reserve goes to excess pool */
867 vio_cmo.excess.size += viodev->cmo.entitled;
868 vio_cmo.excess.free += viodev->cmo.entitled;
869 vio_cmo.reserve.size -= viodev->cmo.entitled;
872 * Until the device is removed it will keep a
873 * minimum entitlement; this will guarantee that
874 * a module unload/load will result in a success.
876 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
877 viodev->cmo.desired = VIO_CMO_MIN_ENT;
878 atomic_set(&viodev->cmo.allocs_failed, 0);
881 spin_unlock_irqrestore(&vio_cmo.lock, flags);
884 static void vio_cmo_set_dma_ops(struct vio_dev *viodev)
886 set_dma_ops(&viodev->dev, &vio_dma_mapping_ops);
890 * vio_cmo_bus_init - CMO entitlement initialization at bus init time
892 * Set up the reserve and excess entitlement pools based on available
893 * system entitlement and the number of devices in the OF tree that
894 * require entitlement in the reserve pool.
896 static void vio_cmo_bus_init(void)
898 struct hvcall_mpp_data mpp_data;
901 memset(&vio_cmo, 0, sizeof(struct vio_cmo));
902 spin_lock_init(&vio_cmo.lock);
903 INIT_LIST_HEAD(&vio_cmo.device_list);
904 INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance);
906 /* Get current system entitlement */
907 err = h_get_mpp(&mpp_data);
910 * On failure, continue with entitlement set to 0, will panic()
911 * later when spare is reserved.
913 if (err != H_SUCCESS) {
914 printk(KERN_ERR "%s: unable to determine system IO "\
915 "entitlement. (%d)\n", __func__, err);
916 vio_cmo.entitled = 0;
918 vio_cmo.entitled = mpp_data.entitled_mem;
921 /* Set reservation and check against entitlement */
922 vio_cmo.spare = VIO_CMO_MIN_ENT;
923 vio_cmo.reserve.size = vio_cmo.spare;
924 vio_cmo.reserve.size += (vio_cmo_num_OF_devs() *
926 if (vio_cmo.reserve.size > vio_cmo.entitled) {
927 printk(KERN_ERR "%s: insufficient system entitlement\n",
929 panic("%s: Insufficient system entitlement", __func__);
932 /* Set the remaining accounting variables */
933 vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size;
934 vio_cmo.excess.free = vio_cmo.excess.size;
935 vio_cmo.min = vio_cmo.reserve.size;
936 vio_cmo.desired = vio_cmo.reserve.size;
939 /* sysfs device functions and data structures for CMO */
941 #define viodev_cmo_rd_attr(name) \
942 static ssize_t viodev_cmo_##name##_show(struct device *dev, \
943 struct device_attribute *attr, \
946 return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name); \
949 static ssize_t viodev_cmo_allocs_failed_show(struct device *dev,
950 struct device_attribute *attr, char *buf)
952 struct vio_dev *viodev = to_vio_dev(dev);
953 return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
956 static ssize_t viodev_cmo_allocs_failed_reset(struct device *dev,
957 struct device_attribute *attr, const char *buf, size_t count)
959 struct vio_dev *viodev = to_vio_dev(dev);
960 atomic_set(&viodev->cmo.allocs_failed, 0);
964 static ssize_t viodev_cmo_desired_set(struct device *dev,
965 struct device_attribute *attr, const char *buf, size_t count)
967 struct vio_dev *viodev = to_vio_dev(dev);
971 ret = strict_strtoul(buf, 10, &new_desired);
975 vio_cmo_set_dev_desired(viodev, new_desired);
979 viodev_cmo_rd_attr(desired);
980 viodev_cmo_rd_attr(entitled);
981 viodev_cmo_rd_attr(allocated);
983 static ssize_t name_show(struct device *, struct device_attribute *, char *);
984 static ssize_t devspec_show(struct device *, struct device_attribute *, char *);
985 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
987 static struct device_attribute vio_cmo_dev_attrs[] = {
991 __ATTR(cmo_desired, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
992 viodev_cmo_desired_show, viodev_cmo_desired_set),
993 __ATTR(cmo_entitled, S_IRUGO, viodev_cmo_entitled_show, NULL),
994 __ATTR(cmo_allocated, S_IRUGO, viodev_cmo_allocated_show, NULL),
995 __ATTR(cmo_allocs_failed, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
996 viodev_cmo_allocs_failed_show, viodev_cmo_allocs_failed_reset),
1000 /* sysfs bus functions and data structures for CMO */
1002 #define viobus_cmo_rd_attr(name) \
1004 viobus_cmo_##name##_show(struct bus_type *bt, char *buf) \
1006 return sprintf(buf, "%lu\n", vio_cmo.name); \
1009 #define viobus_cmo_pool_rd_attr(name, var) \
1011 viobus_cmo_##name##_pool_show_##var(struct bus_type *bt, char *buf) \
1013 return sprintf(buf, "%lu\n", vio_cmo.name.var); \
1016 static ssize_t viobus_cmo_high_reset(struct bus_type *bt, const char *buf,
1019 unsigned long flags;
1021 spin_lock_irqsave(&vio_cmo.lock, flags);
1022 vio_cmo.high = vio_cmo.curr;
1023 spin_unlock_irqrestore(&vio_cmo.lock, flags);
1028 viobus_cmo_rd_attr(entitled);
1029 viobus_cmo_pool_rd_attr(reserve, size);
1030 viobus_cmo_pool_rd_attr(excess, size);
1031 viobus_cmo_pool_rd_attr(excess, free);
1032 viobus_cmo_rd_attr(spare);
1033 viobus_cmo_rd_attr(min);
1034 viobus_cmo_rd_attr(desired);
1035 viobus_cmo_rd_attr(curr);
1036 viobus_cmo_rd_attr(high);
1038 static struct bus_attribute vio_cmo_bus_attrs[] = {
1039 __ATTR(cmo_entitled, S_IRUGO, viobus_cmo_entitled_show, NULL),
1040 __ATTR(cmo_reserve_size, S_IRUGO, viobus_cmo_reserve_pool_show_size, NULL),
1041 __ATTR(cmo_excess_size, S_IRUGO, viobus_cmo_excess_pool_show_size, NULL),
1042 __ATTR(cmo_excess_free, S_IRUGO, viobus_cmo_excess_pool_show_free, NULL),
1043 __ATTR(cmo_spare, S_IRUGO, viobus_cmo_spare_show, NULL),
1044 __ATTR(cmo_min, S_IRUGO, viobus_cmo_min_show, NULL),
1045 __ATTR(cmo_desired, S_IRUGO, viobus_cmo_desired_show, NULL),
1046 __ATTR(cmo_curr, S_IRUGO, viobus_cmo_curr_show, NULL),
1047 __ATTR(cmo_high, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
1048 viobus_cmo_high_show, viobus_cmo_high_reset),
1052 static void vio_cmo_sysfs_init(void)
1054 vio_bus_type.dev_attrs = vio_cmo_dev_attrs;
1055 vio_bus_type.bus_attrs = vio_cmo_bus_attrs;
1057 #else /* CONFIG_PPC_SMLPAR */
1058 int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; }
1059 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {}
1060 static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; }
1061 static void vio_cmo_bus_remove(struct vio_dev *viodev) {}
1062 static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {}
1063 static void vio_cmo_bus_init(void) {}
1064 static void vio_cmo_sysfs_init(void) { }
1065 #endif /* CONFIG_PPC_SMLPAR */
1066 EXPORT_SYMBOL(vio_cmo_entitlement_update);
1067 EXPORT_SYMBOL(vio_cmo_set_dev_desired);
1071 * Platform Facilities Option (PFO) support
1075 * vio_h_cop_sync - Perform a synchronous PFO co-processor operation
1077 * @vdev - Pointer to a struct vio_dev for device
1078 * @op - Pointer to a struct vio_pfo_op for the operation parameters
1080 * Calls the hypervisor to synchronously perform the PFO operation
1081 * described in @op. In the case of a busy response from the hypervisor,
1082 * the operation will be re-submitted indefinitely unless a non-zero timeout
1083 * is specified or an error occurs. The timeout places a limit on when to
1084 * stop re-submitting a operation, the total time can be exceeded if an
1085 * operation is in progress.
1087 * If op->hcall_ret is not NULL, this will be set to the return from the
1088 * last h_cop_op call or it will be 0 if an error not involving the h_call
1093 * -EINVAL if the h_call fails due to an invalid parameter,
1094 * -E2BIG if the h_call can not be performed synchronously,
1095 * -EBUSY if a timeout is specified and has elapsed,
1096 * -EACCES if the memory area for data/status has been rescinded, or
1097 * -EPERM if a hardware fault has been indicated
1099 int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op)
1101 struct device *dev = &vdev->dev;
1102 unsigned long deadline = 0;
1107 deadline = jiffies + msecs_to_jiffies(op->timeout);
1110 hret = plpar_hcall_norets(H_COP, op->flags,
1112 op->in, op->inlen, op->out,
1113 op->outlen, op->csbcpb);
1115 if (hret == H_SUCCESS ||
1116 (hret != H_NOT_ENOUGH_RESOURCES &&
1117 hret != H_BUSY && hret != H_RESOURCE) ||
1118 (op->timeout && time_after(deadline, jiffies)))
1121 dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret);
1138 case H_NOT_ENOUGH_RESOURCES:
1149 dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n",
1150 __func__, ret, hret);
1152 op->hcall_err = hret;
1155 EXPORT_SYMBOL(vio_h_cop_sync);
1157 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
1159 const unsigned char *dma_window;
1160 struct iommu_table *tbl;
1161 unsigned long offset, size;
1163 dma_window = of_get_property(dev->dev.of_node,
1164 "ibm,my-dma-window", NULL);
1168 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
1172 of_parse_dma_window(dev->dev.of_node, dma_window,
1173 &tbl->it_index, &offset, &size);
1175 /* TCE table size - measured in tce entries */
1176 tbl->it_size = size >> IOMMU_PAGE_SHIFT;
1177 /* offset for VIO should always be 0 */
1178 tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
1180 tbl->it_type = TCE_VB;
1181 tbl->it_blocksize = 16;
1183 return iommu_init_table(tbl, -1);
1187 * vio_match_device: - Tell if a VIO device has a matching
1188 * VIO device id structure.
1189 * @ids: array of VIO device id structures to search in
1190 * @dev: the VIO device structure to match against
1192 * Used by a driver to check whether a VIO device present in the
1193 * system is in its list of supported devices. Returns the matching
1194 * vio_device_id structure or NULL if there is no match.
1196 static const struct vio_device_id *vio_match_device(
1197 const struct vio_device_id *ids, const struct vio_dev *dev)
1199 while (ids->type[0] != '\0') {
1200 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
1201 of_device_is_compatible(dev->dev.of_node,
1210 * Convert from struct device to struct vio_dev and pass to driver.
1211 * dev->driver has already been set by generic code because vio_bus_match
1214 static int vio_bus_probe(struct device *dev)
1216 struct vio_dev *viodev = to_vio_dev(dev);
1217 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1218 const struct vio_device_id *id;
1219 int error = -ENODEV;
1224 id = vio_match_device(viodrv->id_table, viodev);
1226 memset(&viodev->cmo, 0, sizeof(viodev->cmo));
1227 if (firmware_has_feature(FW_FEATURE_CMO)) {
1228 error = vio_cmo_bus_probe(viodev);
1232 error = viodrv->probe(viodev, id);
1233 if (error && firmware_has_feature(FW_FEATURE_CMO))
1234 vio_cmo_bus_remove(viodev);
1240 /* convert from struct device to struct vio_dev and pass to driver. */
1241 static int vio_bus_remove(struct device *dev)
1243 struct vio_dev *viodev = to_vio_dev(dev);
1244 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1245 struct device *devptr;
1249 * Hold a reference to the device after the remove function is called
1250 * to allow for CMO accounting cleanup for the device.
1252 devptr = get_device(dev);
1255 ret = viodrv->remove(viodev);
1257 if (!ret && firmware_has_feature(FW_FEATURE_CMO))
1258 vio_cmo_bus_remove(viodev);
1265 * vio_register_driver: - Register a new vio driver
1266 * @drv: The vio_driver structure to be registered.
1268 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
1269 const char *mod_name)
1271 pr_debug("%s: driver %s registering\n", __func__, viodrv->name);
1273 /* fill in 'struct driver' fields */
1274 viodrv->driver.name = viodrv->name;
1275 viodrv->driver.pm = viodrv->pm;
1276 viodrv->driver.bus = &vio_bus_type;
1277 viodrv->driver.owner = owner;
1278 viodrv->driver.mod_name = mod_name;
1280 return driver_register(&viodrv->driver);
1282 EXPORT_SYMBOL(__vio_register_driver);
1285 * vio_unregister_driver - Remove registration of vio driver.
1286 * @driver: The vio_driver struct to be removed form registration
1288 void vio_unregister_driver(struct vio_driver *viodrv)
1290 driver_unregister(&viodrv->driver);
1292 EXPORT_SYMBOL(vio_unregister_driver);
1294 /* vio_dev refcount hit 0 */
1295 static void __devinit vio_dev_release(struct device *dev)
1297 struct iommu_table *tbl = get_iommu_table_base(dev);
1300 iommu_free_table(tbl, dev->of_node ?
1301 dev->of_node->full_name : dev_name(dev));
1302 of_node_put(dev->of_node);
1303 kfree(to_vio_dev(dev));
1307 * vio_register_device_node: - Register a new vio device.
1308 * @of_node: The OF node for this device.
1310 * Creates and initializes a vio_dev structure from the data in
1311 * of_node and adds it to the list of virtual devices.
1312 * Returns a pointer to the created vio_dev or NULL if node has
1313 * NULL device_type or compatible fields.
1315 struct vio_dev *vio_register_device_node(struct device_node *of_node)
1317 struct vio_dev *viodev;
1318 struct device_node *parent_node;
1319 const unsigned int *unit_address;
1320 const unsigned int *pfo_resid = NULL;
1321 enum vio_dev_family family;
1322 const char *of_node_name = of_node->name ? of_node->name : "<unknown>";
1325 * Determine if this node is a under the /vdevice node or under the
1326 * /ibm,platform-facilities node. This decides the device's family.
1328 parent_node = of_get_parent(of_node);
1330 if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
1332 else if (!strcmp(parent_node->full_name, "/vdevice"))
1335 pr_warn("%s: parent(%s) of %s not recognized.\n",
1337 parent_node->full_name,
1339 of_node_put(parent_node);
1342 of_node_put(parent_node);
1344 pr_warn("%s: could not determine the parent of node %s.\n",
1345 __func__, of_node_name);
1349 if (family == PFO) {
1350 if (of_get_property(of_node, "interrupt-controller", NULL)) {
1351 pr_debug("%s: Skipping the interrupt controller %s.\n",
1352 __func__, of_node_name);
1357 /* allocate a vio_dev for this node */
1358 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
1359 if (viodev == NULL) {
1360 pr_warn("%s: allocation failure for VIO device.\n", __func__);
1364 /* we need the 'device_type' property, in order to match with drivers */
1365 viodev->family = family;
1366 if (viodev->family == VDEVICE) {
1367 if (of_node->type != NULL)
1368 viodev->type = of_node->type;
1370 pr_warn("%s: node %s is missing the 'device_type' "
1371 "property.\n", __func__, of_node_name);
1375 unit_address = of_get_property(of_node, "reg", NULL);
1376 if (unit_address == NULL) {
1377 pr_warn("%s: node %s missing 'reg'\n",
1378 __func__, of_node_name);
1381 dev_set_name(&viodev->dev, "%x", *unit_address);
1382 viodev->irq = irq_of_parse_and_map(of_node, 0);
1383 viodev->unit_address = *unit_address;
1385 /* PFO devices need their resource_id for submitting COP_OPs
1386 * This is an optional field for devices, but is required when
1387 * performing synchronous ops */
1388 pfo_resid = of_get_property(of_node, "ibm,resource-id", NULL);
1389 if (pfo_resid != NULL)
1390 viodev->resource_id = *pfo_resid;
1392 unit_address = NULL;
1393 dev_set_name(&viodev->dev, "%s", of_node_name);
1394 viodev->type = of_node_name;
1398 viodev->name = of_node->name;
1399 viodev->dev.of_node = of_node_get(of_node);
1401 if (firmware_has_feature(FW_FEATURE_CMO))
1402 vio_cmo_set_dma_ops(viodev);
1404 set_dma_ops(&viodev->dev, &dma_iommu_ops);
1405 set_iommu_table_base(&viodev->dev, vio_build_iommu_table(viodev));
1406 set_dev_node(&viodev->dev, of_node_to_nid(of_node));
1408 /* init generic 'struct device' fields: */
1409 viodev->dev.parent = &vio_bus_device.dev;
1410 viodev->dev.bus = &vio_bus_type;
1411 viodev->dev.release = vio_dev_release;
1412 /* needed to ensure proper operation of coherent allocations
1413 * later, in case driver doesn't set it explicitly */
1414 dma_set_mask(&viodev->dev, DMA_BIT_MASK(64));
1415 dma_set_coherent_mask(&viodev->dev, DMA_BIT_MASK(64));
1417 /* register with generic device framework */
1418 if (device_register(&viodev->dev)) {
1419 printk(KERN_ERR "%s: failed to register device %s\n",
1420 __func__, dev_name(&viodev->dev));
1421 put_device(&viodev->dev);
1427 out: /* Use this exit point for any return prior to device_register */
1432 EXPORT_SYMBOL(vio_register_device_node);
1435 * vio_bus_scan_for_devices - Scan OF and register each child device
1436 * @root_name - OF node name for the root of the subtree to search.
1437 * This must be non-NULL
1439 * Starting from the root node provide, register the device node for
1440 * each child beneath the root.
1442 static void vio_bus_scan_register_devices(char *root_name)
1444 struct device_node *node_root, *node_child;
1449 node_root = of_find_node_by_name(NULL, root_name);
1453 * Create struct vio_devices for each virtual device in
1454 * the device tree. Drivers will associate with them later.
1456 node_child = of_get_next_child(node_root, NULL);
1457 while (node_child) {
1458 vio_register_device_node(node_child);
1459 node_child = of_get_next_child(node_root, node_child);
1461 of_node_put(node_root);
1466 * vio_bus_init: - Initialize the virtual IO bus
1468 static int __init vio_bus_init(void)
1472 if (firmware_has_feature(FW_FEATURE_CMO))
1473 vio_cmo_sysfs_init();
1475 err = bus_register(&vio_bus_type);
1477 printk(KERN_ERR "failed to register VIO bus\n");
1482 * The fake parent of all vio devices, just to give us
1485 err = device_register(&vio_bus_device.dev);
1487 printk(KERN_WARNING "%s: device_register returned %i\n",
1492 if (firmware_has_feature(FW_FEATURE_CMO))
1495 vio_bus_scan_register_devices("vdevice");
1496 vio_bus_scan_register_devices("ibm,platform-facilities");
1500 __initcall(vio_bus_init);
1502 static ssize_t name_show(struct device *dev,
1503 struct device_attribute *attr, char *buf)
1505 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
1508 static ssize_t devspec_show(struct device *dev,
1509 struct device_attribute *attr, char *buf)
1511 struct device_node *of_node = dev->of_node;
1513 return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
1516 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1519 const struct vio_dev *vio_dev = to_vio_dev(dev);
1520 struct device_node *dn;
1526 cp = of_get_property(dn, "compatible", NULL);
1530 return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
1533 static struct device_attribute vio_dev_attrs[] = {
1536 __ATTR_RO(modalias),
1540 void __devinit vio_unregister_device(struct vio_dev *viodev)
1542 device_unregister(&viodev->dev);
1544 EXPORT_SYMBOL(vio_unregister_device);
1546 static int vio_bus_match(struct device *dev, struct device_driver *drv)
1548 const struct vio_dev *vio_dev = to_vio_dev(dev);
1549 struct vio_driver *vio_drv = to_vio_driver(drv);
1550 const struct vio_device_id *ids = vio_drv->id_table;
1552 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
1555 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
1557 const struct vio_dev *vio_dev = to_vio_dev(dev);
1558 struct device_node *dn;
1564 cp = of_get_property(dn, "compatible", NULL);
1568 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
1572 static struct bus_type vio_bus_type = {
1574 .dev_attrs = vio_dev_attrs,
1575 .uevent = vio_hotplug,
1576 .match = vio_bus_match,
1577 .probe = vio_bus_probe,
1578 .remove = vio_bus_remove,
1582 * vio_get_attribute: - get attribute for virtual device
1583 * @vdev: The vio device to get property.
1584 * @which: The property/attribute to be extracted.
1585 * @length: Pointer to length of returned data size (unused if NULL).
1587 * Calls prom.c's of_get_property() to return the value of the
1588 * attribute specified by @which
1590 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
1592 return of_get_property(vdev->dev.of_node, which, length);
1594 EXPORT_SYMBOL(vio_get_attribute);
1596 #ifdef CONFIG_PPC_PSERIES
1597 /* vio_find_name() - internal because only vio.c knows how we formatted the
1600 static struct vio_dev *vio_find_name(const char *name)
1602 struct device *found;
1604 found = bus_find_device_by_name(&vio_bus_type, NULL, name);
1608 return to_vio_dev(found);
1612 * vio_find_node - find an already-registered vio_dev
1613 * @vnode: device_node of the virtual device we're looking for
1615 struct vio_dev *vio_find_node(struct device_node *vnode)
1617 const uint32_t *unit_address;
1619 struct device_node *vnode_parent;
1620 const char *dev_type;
1622 vnode_parent = of_get_parent(vnode);
1626 dev_type = of_get_property(vnode_parent, "device_type", NULL);
1627 of_node_put(vnode_parent);
1631 /* construct the kobject name from the device node */
1632 if (!strcmp(dev_type, "vdevice")) {
1633 unit_address = of_get_property(vnode, "reg", NULL);
1636 snprintf(kobj_name, sizeof(kobj_name), "%x", *unit_address);
1637 } else if (!strcmp(dev_type, "ibm,platform-facilities"))
1638 snprintf(kobj_name, sizeof(kobj_name), "%s", vnode->name);
1642 return vio_find_name(kobj_name);
1644 EXPORT_SYMBOL(vio_find_node);
1646 int vio_enable_interrupts(struct vio_dev *dev)
1648 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
1649 if (rc != H_SUCCESS)
1650 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
1653 EXPORT_SYMBOL(vio_enable_interrupts);
1655 int vio_disable_interrupts(struct vio_dev *dev)
1657 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
1658 if (rc != H_SUCCESS)
1659 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
1662 EXPORT_SYMBOL(vio_disable_interrupts);
1663 #endif /* CONFIG_PPC_PSERIES */