1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IBM PowerPC Virtual I/O Infrastructure Support.
5 * Copyright (c) 2003,2008 IBM Corp.
6 * Dave Engebretsen engebret@us.ibm.com
7 * Santiago Leon santil@us.ibm.com
8 * Hollis Blanchard <hollisb@us.ibm.com>
10 * Robert Jennings <rcjenn@us.ibm.com>
13 #include <linux/cpu.h>
14 #include <linux/types.h>
15 #include <linux/delay.h>
16 #include <linux/stat.h>
17 #include <linux/device.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/console.h>
21 #include <linux/export.h>
23 #include <linux/dma-map-ops.h>
24 #include <linux/kobject.h>
26 #include <asm/iommu.h>
30 #include <asm/firmware.h>
33 #include <asm/hvcall.h>
34 #include <asm/machdep.h>
36 static struct vio_dev vio_bus_device = { /* fake "parent" device */
39 .dev.init_name = "vio",
40 .dev.bus = &vio_bus_type,
43 #ifdef CONFIG_PPC_SMLPAR
45 * vio_cmo_pool - A pool of IO memory for CMO use
47 * @size: The size of the pool in bytes
48 * @free: The amount of free memory in the pool
55 /* How many ms to delay queued balance work */
56 #define VIO_CMO_BALANCE_DELAY 100
58 /* Portion out IO memory to CMO devices by this chunk size */
59 #define VIO_CMO_BALANCE_CHUNK 131072
62 * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement
64 * @vio_dev: struct vio_dev pointer
65 * @list: pointer to other devices on bus that are being tracked
67 struct vio_cmo_dev_entry {
68 struct vio_dev *viodev;
69 struct list_head list;
73 * vio_cmo - VIO bus accounting structure for CMO entitlement
75 * @lock: spinlock for entire structure
76 * @balance_q: work queue for balancing system entitlement
77 * @device_list: list of CMO-enabled devices requiring entitlement
78 * @entitled: total system entitlement in bytes
79 * @reserve: pool of memory from which devices reserve entitlement, incl. spare
80 * @excess: pool of excess entitlement not needed for device reserves or spare
81 * @spare: IO memory for device hotplug functionality
82 * @min: minimum necessary for system operation
83 * @desired: desired memory for system operation
84 * @curr: bytes currently allocated
85 * @high: high water mark for IO data usage
87 static struct vio_cmo {
89 struct delayed_work balance_q;
90 struct list_head device_list;
92 struct vio_cmo_pool reserve;
93 struct vio_cmo_pool excess;
102 * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows
104 static int vio_cmo_num_OF_devs(void)
106 struct device_node *node_vroot;
110 * Count the number of vdevice entries with an
111 * ibm,my-dma-window OF property
113 node_vroot = of_find_node_by_name(NULL, "vdevice");
115 struct device_node *of_node;
116 struct property *prop;
118 for_each_child_of_node(node_vroot, of_node) {
119 prop = of_find_property(of_node, "ibm,my-dma-window",
125 of_node_put(node_vroot);
130 * vio_cmo_alloc - allocate IO memory for CMO-enable devices
132 * @viodev: VIO device requesting IO memory
133 * @size: size of allocation requested
135 * Allocations come from memory reserved for the devices and any excess
136 * IO memory available to all devices. The spare pool used to service
137 * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be
141 * 0 for successful allocation and -ENOMEM for a failure
143 static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size)
146 size_t reserve_free = 0;
147 size_t excess_free = 0;
150 spin_lock_irqsave(&vio_cmo.lock, flags);
152 /* Determine the amount of free entitlement available in reserve */
153 if (viodev->cmo.entitled > viodev->cmo.allocated)
154 reserve_free = viodev->cmo.entitled - viodev->cmo.allocated;
156 /* If spare is not fulfilled, the excess pool can not be used. */
157 if (vio_cmo.spare >= VIO_CMO_MIN_ENT)
158 excess_free = vio_cmo.excess.free;
160 /* The request can be satisfied */
161 if ((reserve_free + excess_free) >= size) {
162 vio_cmo.curr += size;
163 if (vio_cmo.curr > vio_cmo.high)
164 vio_cmo.high = vio_cmo.curr;
165 viodev->cmo.allocated += size;
166 size -= min(reserve_free, size);
167 vio_cmo.excess.free -= size;
171 spin_unlock_irqrestore(&vio_cmo.lock, flags);
176 * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices
177 * @viodev: VIO device freeing IO memory
178 * @size: size of deallocation
180 * IO memory is freed by the device back to the correct memory pools.
181 * The spare pool is replenished first from either memory pool, then
182 * the reserve pool is used to reduce device entitlement, the excess
183 * pool is used to increase the reserve pool toward the desired entitlement
184 * target, and then the remaining memory is returned to the pools.
187 static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size)
190 size_t spare_needed = 0;
191 size_t excess_freed = 0;
192 size_t reserve_freed = size;
196 spin_lock_irqsave(&vio_cmo.lock, flags);
197 vio_cmo.curr -= size;
199 /* Amount of memory freed from the excess pool */
200 if (viodev->cmo.allocated > viodev->cmo.entitled) {
201 excess_freed = min(reserve_freed, (viodev->cmo.allocated -
202 viodev->cmo.entitled));
203 reserve_freed -= excess_freed;
206 /* Remove allocation from device */
207 viodev->cmo.allocated -= (reserve_freed + excess_freed);
209 /* Spare is a subset of the reserve pool, replenish it first. */
210 spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare;
213 * Replenish the spare in the reserve pool from the excess pool.
214 * This moves entitlement into the reserve pool.
216 if (spare_needed && excess_freed) {
217 tmp = min(excess_freed, spare_needed);
218 vio_cmo.excess.size -= tmp;
219 vio_cmo.reserve.size += tmp;
220 vio_cmo.spare += tmp;
227 * Replenish the spare in the reserve pool from the reserve pool.
228 * This removes entitlement from the device down to VIO_CMO_MIN_ENT,
229 * if needed, and gives it to the spare pool. The amount of used
230 * memory in this pool does not change.
232 if (spare_needed && reserve_freed) {
233 tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT));
235 vio_cmo.spare += tmp;
236 viodev->cmo.entitled -= tmp;
237 reserve_freed -= tmp;
243 * Increase the reserve pool until the desired allocation is met.
244 * Move an allocation freed from the excess pool into the reserve
245 * pool and schedule a balance operation.
247 if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) {
248 tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size));
250 vio_cmo.excess.size -= tmp;
251 vio_cmo.reserve.size += tmp;
256 /* Return memory from the excess pool to that pool */
258 vio_cmo.excess.free += excess_freed;
261 schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY);
262 spin_unlock_irqrestore(&vio_cmo.lock, flags);
266 * vio_cmo_entitlement_update - Manage system entitlement changes
268 * @new_entitlement: new system entitlement to attempt to accommodate
270 * Increases in entitlement will be used to fulfill the spare entitlement
271 * and the rest is given to the excess pool. Decreases, if they are
272 * possible, come from the excess pool and from unused device entitlement
274 * Returns: 0 on success, -ENOMEM when change can not be made
276 int vio_cmo_entitlement_update(size_t new_entitlement)
278 struct vio_dev *viodev;
279 struct vio_cmo_dev_entry *dev_ent;
281 size_t avail, delta, tmp;
283 spin_lock_irqsave(&vio_cmo.lock, flags);
285 /* Entitlement increases */
286 if (new_entitlement > vio_cmo.entitled) {
287 delta = new_entitlement - vio_cmo.entitled;
289 /* Fulfill spare allocation */
290 if (vio_cmo.spare < VIO_CMO_MIN_ENT) {
291 tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare));
292 vio_cmo.spare += tmp;
293 vio_cmo.reserve.size += tmp;
297 /* Remaining new allocation goes to the excess pool */
298 vio_cmo.entitled += delta;
299 vio_cmo.excess.size += delta;
300 vio_cmo.excess.free += delta;
305 /* Entitlement decreases */
306 delta = vio_cmo.entitled - new_entitlement;
307 avail = vio_cmo.excess.free;
310 * Need to check how much unused entitlement each device can
311 * sacrifice to fulfill entitlement change.
313 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
317 viodev = dev_ent->viodev;
318 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
319 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
320 avail += viodev->cmo.entitled -
321 max_t(size_t, viodev->cmo.allocated,
325 if (delta <= avail) {
326 vio_cmo.entitled -= delta;
328 /* Take entitlement from the excess pool first */
329 tmp = min(vio_cmo.excess.free, delta);
330 vio_cmo.excess.size -= tmp;
331 vio_cmo.excess.free -= tmp;
335 * Remove all but VIO_CMO_MIN_ENT bytes from devices
336 * until entitlement change is served
338 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
342 viodev = dev_ent->viodev;
344 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
345 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
346 tmp = viodev->cmo.entitled -
347 max_t(size_t, viodev->cmo.allocated,
349 viodev->cmo.entitled -= min(tmp, delta);
350 delta -= min(tmp, delta);
353 spin_unlock_irqrestore(&vio_cmo.lock, flags);
358 schedule_delayed_work(&vio_cmo.balance_q, 0);
359 spin_unlock_irqrestore(&vio_cmo.lock, flags);
364 * vio_cmo_balance - Balance entitlement among devices
366 * @work: work queue structure for this operation
368 * Any system entitlement above the minimum needed for devices, or
369 * already allocated to devices, can be distributed to the devices.
370 * The list of devices is iterated through to recalculate the desired
371 * entitlement level and to determine how much entitlement above the
372 * minimum entitlement is allocated to devices.
374 * Small chunks of the available entitlement are given to devices until
375 * their requirements are fulfilled or there is no entitlement left to give.
376 * Upon completion sizes of the reserve and excess pools are calculated.
378 * The system minimum entitlement level is also recalculated here.
379 * Entitlement will be reserved for devices even after vio_bus_remove to
380 * accommodate reloading the driver. The OF tree is walked to count the
381 * number of devices present and this will remove entitlement for devices
382 * that have actually left the system after having vio_bus_remove called.
384 static void vio_cmo_balance(struct work_struct *work)
387 struct vio_dev *viodev;
388 struct vio_cmo_dev_entry *dev_ent;
390 size_t avail = 0, level, chunk, need;
391 int devcount = 0, fulfilled;
393 cmo = container_of(work, struct vio_cmo, balance_q.work);
395 spin_lock_irqsave(&vio_cmo.lock, flags);
397 /* Calculate minimum entitlement and fulfill spare */
398 cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT;
399 BUG_ON(cmo->min > cmo->entitled);
400 cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min));
401 cmo->min += cmo->spare;
402 cmo->desired = cmo->min;
405 * Determine how much entitlement is available and reset device
408 avail = cmo->entitled - cmo->spare;
409 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
410 viodev = dev_ent->viodev;
412 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
413 cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT);
414 avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT);
418 * Having provided each device with the minimum entitlement, loop
419 * over the devices portioning out the remaining entitlement
420 * until there is nothing left.
422 level = VIO_CMO_MIN_ENT;
425 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
426 viodev = dev_ent->viodev;
428 if (viodev->cmo.desired <= level) {
434 * Give the device up to VIO_CMO_BALANCE_CHUNK
435 * bytes of entitlement, but do not exceed the
436 * desired level of entitlement for the device.
438 chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK);
439 chunk = min(chunk, (viodev->cmo.desired -
440 viodev->cmo.entitled));
441 viodev->cmo.entitled += chunk;
444 * If the memory for this entitlement increase was
445 * already allocated to the device it does not come
446 * from the available pool being portioned out.
448 need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
449 max(viodev->cmo.allocated, level);
453 if (fulfilled == devcount)
455 level += VIO_CMO_BALANCE_CHUNK;
458 /* Calculate new reserve and excess pool sizes */
459 cmo->reserve.size = cmo->min;
460 cmo->excess.free = 0;
461 cmo->excess.size = 0;
463 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
464 viodev = dev_ent->viodev;
465 /* Calculated reserve size above the minimum entitlement */
466 if (viodev->cmo.entitled)
467 cmo->reserve.size += (viodev->cmo.entitled -
469 /* Calculated used excess entitlement */
470 if (viodev->cmo.allocated > viodev->cmo.entitled)
471 need += viodev->cmo.allocated - viodev->cmo.entitled;
473 cmo->excess.size = cmo->entitled - cmo->reserve.size;
474 cmo->excess.free = cmo->excess.size - need;
476 cancel_delayed_work(to_delayed_work(work));
477 spin_unlock_irqrestore(&vio_cmo.lock, flags);
480 static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
481 dma_addr_t *dma_handle, gfp_t flag,
484 struct vio_dev *viodev = to_vio_dev(dev);
487 if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
488 atomic_inc(&viodev->cmo.allocs_failed);
492 ret = iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
493 dma_handle, dev->coherent_dma_mask, flag,
495 if (unlikely(ret == NULL)) {
496 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
497 atomic_inc(&viodev->cmo.allocs_failed);
503 static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
504 void *vaddr, dma_addr_t dma_handle,
507 struct vio_dev *viodev = to_vio_dev(dev);
509 iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle);
510 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
513 static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
514 unsigned long offset, size_t size,
515 enum dma_data_direction direction,
518 struct vio_dev *viodev = to_vio_dev(dev);
519 struct iommu_table *tbl = get_iommu_table_base(dev);
520 dma_addr_t ret = DMA_MAPPING_ERROR;
522 if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl))))
524 ret = iommu_map_page(dev, tbl, page, offset, size, dma_get_mask(dev),
526 if (unlikely(ret == DMA_MAPPING_ERROR))
531 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
533 atomic_inc(&viodev->cmo.allocs_failed);
534 return DMA_MAPPING_ERROR;
537 static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
539 enum dma_data_direction direction,
542 struct vio_dev *viodev = to_vio_dev(dev);
543 struct iommu_table *tbl = get_iommu_table_base(dev);
545 iommu_unmap_page(tbl, dma_handle, size, direction, attrs);
546 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
549 static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
550 int nelems, enum dma_data_direction direction,
553 struct vio_dev *viodev = to_vio_dev(dev);
554 struct iommu_table *tbl = get_iommu_table_base(dev);
555 struct scatterlist *sgl;
557 size_t alloc_size = 0;
559 for_each_sg(sglist, sgl, nelems, count)
560 alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
562 if (vio_cmo_alloc(viodev, alloc_size))
564 ret = ppc_iommu_map_sg(dev, tbl, sglist, nelems, dma_get_mask(dev),
569 for_each_sg(sglist, sgl, ret, count)
570 alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
572 vio_cmo_dealloc(viodev, alloc_size);
576 vio_cmo_dealloc(viodev, alloc_size);
578 atomic_inc(&viodev->cmo.allocs_failed);
582 static void vio_dma_iommu_unmap_sg(struct device *dev,
583 struct scatterlist *sglist, int nelems,
584 enum dma_data_direction direction,
587 struct vio_dev *viodev = to_vio_dev(dev);
588 struct iommu_table *tbl = get_iommu_table_base(dev);
589 struct scatterlist *sgl;
590 size_t alloc_size = 0;
593 for_each_sg(sglist, sgl, nelems, count)
594 alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
596 ppc_iommu_unmap_sg(tbl, sglist, nelems, direction, attrs);
597 vio_cmo_dealloc(viodev, alloc_size);
600 static const struct dma_map_ops vio_dma_mapping_ops = {
601 .alloc = vio_dma_iommu_alloc_coherent,
602 .free = vio_dma_iommu_free_coherent,
603 .map_sg = vio_dma_iommu_map_sg,
604 .unmap_sg = vio_dma_iommu_unmap_sg,
605 .map_page = vio_dma_iommu_map_page,
606 .unmap_page = vio_dma_iommu_unmap_page,
607 .dma_supported = dma_iommu_dma_supported,
608 .get_required_mask = dma_iommu_get_required_mask,
609 .mmap = dma_common_mmap,
610 .get_sgtable = dma_common_get_sgtable,
611 .alloc_pages = dma_common_alloc_pages,
612 .free_pages = dma_common_free_pages,
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 kref_init(&tbl->it_kref);
1184 of_parse_dma_window(dev->dev.of_node, dma_window,
1185 &tbl->it_index, &offset, &size);
1187 /* TCE table size - measured in tce entries */
1188 tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
1189 tbl->it_size = size >> tbl->it_page_shift;
1190 /* offset for VIO should always be 0 */
1191 tbl->it_offset = offset >> tbl->it_page_shift;
1193 tbl->it_type = TCE_VB;
1194 tbl->it_blocksize = 16;
1196 if (firmware_has_feature(FW_FEATURE_LPAR))
1197 tbl->it_ops = &iommu_table_lpar_multi_ops;
1199 tbl->it_ops = &iommu_table_pseries_ops;
1201 return iommu_init_table(tbl, -1, 0, 0);
1205 * vio_match_device: - Tell if a VIO device has a matching
1206 * VIO device id structure.
1207 * @ids: array of VIO device id structures to search in
1208 * @dev: the VIO device structure to match against
1210 * Used by a driver to check whether a VIO device present in the
1211 * system is in its list of supported devices. Returns the matching
1212 * vio_device_id structure or NULL if there is no match.
1214 static const struct vio_device_id *vio_match_device(
1215 const struct vio_device_id *ids, const struct vio_dev *dev)
1217 while (ids->type[0] != '\0') {
1218 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
1219 of_device_is_compatible(dev->dev.of_node,
1228 * Convert from struct device to struct vio_dev and pass to driver.
1229 * dev->driver has already been set by generic code because vio_bus_match
1232 static int vio_bus_probe(struct device *dev)
1234 struct vio_dev *viodev = to_vio_dev(dev);
1235 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1236 const struct vio_device_id *id;
1237 int error = -ENODEV;
1242 id = vio_match_device(viodrv->id_table, viodev);
1244 memset(&viodev->cmo, 0, sizeof(viodev->cmo));
1245 if (firmware_has_feature(FW_FEATURE_CMO)) {
1246 error = vio_cmo_bus_probe(viodev);
1250 error = viodrv->probe(viodev, id);
1251 if (error && firmware_has_feature(FW_FEATURE_CMO))
1252 vio_cmo_bus_remove(viodev);
1258 /* convert from struct device to struct vio_dev and pass to driver. */
1259 static int vio_bus_remove(struct device *dev)
1261 struct vio_dev *viodev = to_vio_dev(dev);
1262 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1263 struct device *devptr;
1267 * Hold a reference to the device after the remove function is called
1268 * to allow for CMO accounting cleanup for the device.
1270 devptr = get_device(dev);
1273 ret = viodrv->remove(viodev);
1275 if (!ret && firmware_has_feature(FW_FEATURE_CMO))
1276 vio_cmo_bus_remove(viodev);
1283 * vio_register_driver: - Register a new vio driver
1284 * @viodrv: The vio_driver structure to be registered.
1286 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
1287 const char *mod_name)
1289 // vio_bus_type is only initialised for pseries
1290 if (!machine_is(pseries))
1293 pr_debug("%s: driver %s registering\n", __func__, viodrv->name);
1295 /* fill in 'struct driver' fields */
1296 viodrv->driver.name = viodrv->name;
1297 viodrv->driver.pm = viodrv->pm;
1298 viodrv->driver.bus = &vio_bus_type;
1299 viodrv->driver.owner = owner;
1300 viodrv->driver.mod_name = mod_name;
1302 return driver_register(&viodrv->driver);
1304 EXPORT_SYMBOL(__vio_register_driver);
1307 * vio_unregister_driver - Remove registration of vio driver.
1308 * @viodrv: The vio_driver struct to be removed form registration
1310 void vio_unregister_driver(struct vio_driver *viodrv)
1312 driver_unregister(&viodrv->driver);
1314 EXPORT_SYMBOL(vio_unregister_driver);
1316 /* vio_dev refcount hit 0 */
1317 static void vio_dev_release(struct device *dev)
1319 struct iommu_table *tbl = get_iommu_table_base(dev);
1322 iommu_tce_table_put(tbl);
1323 of_node_put(dev->of_node);
1324 kfree(to_vio_dev(dev));
1328 * vio_register_device_node: - Register a new vio device.
1329 * @of_node: The OF node for this device.
1331 * Creates and initializes a vio_dev structure from the data in
1332 * of_node and adds it to the list of virtual devices.
1333 * Returns a pointer to the created vio_dev or NULL if node has
1334 * NULL device_type or compatible fields.
1336 struct vio_dev *vio_register_device_node(struct device_node *of_node)
1338 struct vio_dev *viodev;
1339 struct device_node *parent_node;
1341 enum vio_dev_family family;
1344 * Determine if this node is a under the /vdevice node or under the
1345 * /ibm,platform-facilities node. This decides the device's family.
1347 parent_node = of_get_parent(of_node);
1349 if (of_node_is_type(parent_node, "ibm,platform-facilities"))
1351 else if (of_node_is_type(parent_node, "vdevice"))
1354 pr_warn("%s: parent(%pOF) of %pOFn not recognized.\n",
1358 of_node_put(parent_node);
1361 of_node_put(parent_node);
1363 pr_warn("%s: could not determine the parent of node %pOFn.\n",
1368 if (family == PFO) {
1369 if (of_get_property(of_node, "interrupt-controller", NULL)) {
1370 pr_debug("%s: Skipping the interrupt controller %pOFn.\n",
1376 /* allocate a vio_dev for this node */
1377 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
1378 if (viodev == NULL) {
1379 pr_warn("%s: allocation failure for VIO device.\n", __func__);
1383 /* we need the 'device_type' property, in order to match with drivers */
1384 viodev->family = family;
1385 if (viodev->family == VDEVICE) {
1386 unsigned int unit_address;
1388 viodev->type = of_node_get_device_type(of_node);
1389 if (!viodev->type) {
1390 pr_warn("%s: node %pOFn is missing the 'device_type' "
1391 "property.\n", __func__, of_node);
1395 prop = of_get_property(of_node, "reg", NULL);
1397 pr_warn("%s: node %pOFn missing 'reg'\n",
1401 unit_address = of_read_number(prop, 1);
1402 dev_set_name(&viodev->dev, "%x", unit_address);
1403 viodev->irq = irq_of_parse_and_map(of_node, 0);
1404 viodev->unit_address = unit_address;
1406 /* PFO devices need their resource_id for submitting COP_OPs
1407 * This is an optional field for devices, but is required when
1408 * performing synchronous ops */
1409 prop = of_get_property(of_node, "ibm,resource-id", NULL);
1411 viodev->resource_id = of_read_number(prop, 1);
1413 dev_set_name(&viodev->dev, "%pOFn", of_node);
1414 viodev->type = dev_name(&viodev->dev);
1418 viodev->name = of_node->name;
1419 viodev->dev.of_node = of_node_get(of_node);
1421 set_dev_node(&viodev->dev, of_node_to_nid(of_node));
1423 /* init generic 'struct device' fields: */
1424 viodev->dev.parent = &vio_bus_device.dev;
1425 viodev->dev.bus = &vio_bus_type;
1426 viodev->dev.release = vio_dev_release;
1428 if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) {
1429 if (firmware_has_feature(FW_FEATURE_CMO))
1430 vio_cmo_set_dma_ops(viodev);
1432 set_dma_ops(&viodev->dev, &dma_iommu_ops);
1434 set_iommu_table_base(&viodev->dev,
1435 vio_build_iommu_table(viodev));
1437 /* needed to ensure proper operation of coherent allocations
1438 * later, in case driver doesn't set it explicitly */
1439 viodev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
1440 viodev->dev.dma_mask = &viodev->dev.coherent_dma_mask;
1443 /* register with generic device framework */
1444 if (device_register(&viodev->dev)) {
1445 printk(KERN_ERR "%s: failed to register device %s\n",
1446 __func__, dev_name(&viodev->dev));
1447 put_device(&viodev->dev);
1453 out: /* Use this exit point for any return prior to device_register */
1458 EXPORT_SYMBOL(vio_register_device_node);
1461 * vio_bus_scan_for_devices - Scan OF and register each child device
1462 * @root_name - OF node name for the root of the subtree to search.
1463 * This must be non-NULL
1465 * Starting from the root node provide, register the device node for
1466 * each child beneath the root.
1468 static void vio_bus_scan_register_devices(char *root_name)
1470 struct device_node *node_root, *node_child;
1475 node_root = of_find_node_by_name(NULL, root_name);
1479 * Create struct vio_devices for each virtual device in
1480 * the device tree. Drivers will associate with them later.
1482 node_child = of_get_next_child(node_root, NULL);
1483 while (node_child) {
1484 vio_register_device_node(node_child);
1485 node_child = of_get_next_child(node_root, node_child);
1487 of_node_put(node_root);
1492 * vio_bus_init: - Initialize the virtual IO bus
1494 static int __init vio_bus_init(void)
1498 if (firmware_has_feature(FW_FEATURE_CMO))
1499 vio_cmo_sysfs_init();
1501 err = bus_register(&vio_bus_type);
1503 printk(KERN_ERR "failed to register VIO bus\n");
1508 * The fake parent of all vio devices, just to give us
1511 err = device_register(&vio_bus_device.dev);
1513 printk(KERN_WARNING "%s: device_register returned %i\n",
1518 if (firmware_has_feature(FW_FEATURE_CMO))
1523 machine_postcore_initcall(pseries, vio_bus_init);
1525 static int __init vio_device_init(void)
1527 vio_bus_scan_register_devices("vdevice");
1528 vio_bus_scan_register_devices("ibm,platform-facilities");
1532 machine_device_initcall(pseries, vio_device_init);
1534 static ssize_t name_show(struct device *dev,
1535 struct device_attribute *attr, char *buf)
1537 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
1539 static DEVICE_ATTR_RO(name);
1541 static ssize_t devspec_show(struct device *dev,
1542 struct device_attribute *attr, char *buf)
1544 struct device_node *of_node = dev->of_node;
1546 return sprintf(buf, "%pOF\n", of_node);
1548 static DEVICE_ATTR_RO(devspec);
1550 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1553 const struct vio_dev *vio_dev = to_vio_dev(dev);
1554 struct device_node *dn;
1562 cp = of_get_property(dn, "compatible", NULL);
1568 return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
1570 static DEVICE_ATTR_RO(modalias);
1572 static struct attribute *vio_dev_attrs[] = {
1573 &dev_attr_name.attr,
1574 &dev_attr_devspec.attr,
1575 &dev_attr_modalias.attr,
1578 ATTRIBUTE_GROUPS(vio_dev);
1580 void vio_unregister_device(struct vio_dev *viodev)
1582 device_unregister(&viodev->dev);
1583 if (viodev->family == VDEVICE)
1584 irq_dispose_mapping(viodev->irq);
1586 EXPORT_SYMBOL(vio_unregister_device);
1588 static int vio_bus_match(struct device *dev, struct device_driver *drv)
1590 const struct vio_dev *vio_dev = to_vio_dev(dev);
1591 struct vio_driver *vio_drv = to_vio_driver(drv);
1592 const struct vio_device_id *ids = vio_drv->id_table;
1594 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
1597 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
1599 const struct vio_dev *vio_dev = to_vio_dev(dev);
1600 struct device_node *dn;
1606 cp = of_get_property(dn, "compatible", NULL);
1610 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
1614 struct bus_type vio_bus_type = {
1616 .dev_groups = vio_dev_groups,
1617 .uevent = vio_hotplug,
1618 .match = vio_bus_match,
1619 .probe = vio_bus_probe,
1620 .remove = vio_bus_remove,
1624 * vio_get_attribute: - get attribute for virtual device
1625 * @vdev: The vio device to get property.
1626 * @which: The property/attribute to be extracted.
1627 * @length: Pointer to length of returned data size (unused if NULL).
1629 * Calls prom.c's of_get_property() to return the value of the
1630 * attribute specified by @which
1632 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
1634 return of_get_property(vdev->dev.of_node, which, length);
1636 EXPORT_SYMBOL(vio_get_attribute);
1638 /* vio_find_name() - internal because only vio.c knows how we formatted the
1641 static struct vio_dev *vio_find_name(const char *name)
1643 struct device *found;
1645 found = bus_find_device_by_name(&vio_bus_type, NULL, name);
1649 return to_vio_dev(found);
1653 * vio_find_node - find an already-registered vio_dev
1654 * @vnode: device_node of the virtual device we're looking for
1656 * Takes a reference to the embedded struct device which needs to be dropped
1659 struct vio_dev *vio_find_node(struct device_node *vnode)
1662 struct device_node *vnode_parent;
1664 vnode_parent = of_get_parent(vnode);
1668 /* construct the kobject name from the device node */
1669 if (of_node_is_type(vnode_parent, "vdevice")) {
1672 prop = of_get_property(vnode, "reg", NULL);
1675 snprintf(kobj_name, sizeof(kobj_name), "%x",
1676 (uint32_t)of_read_number(prop, 1));
1677 } else if (of_node_is_type(vnode_parent, "ibm,platform-facilities"))
1678 snprintf(kobj_name, sizeof(kobj_name), "%pOFn", vnode);
1682 of_node_put(vnode_parent);
1683 return vio_find_name(kobj_name);
1685 of_node_put(vnode_parent);
1688 EXPORT_SYMBOL(vio_find_node);
1690 int vio_enable_interrupts(struct vio_dev *dev)
1692 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
1693 if (rc != H_SUCCESS)
1694 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
1697 EXPORT_SYMBOL(vio_enable_interrupts);
1699 int vio_disable_interrupts(struct vio_dev *dev)
1701 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
1702 if (rc != H_SUCCESS)
1703 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
1706 EXPORT_SYMBOL(vio_disable_interrupts);
1708 static int __init vio_init(void)
1710 dma_debug_add_bus(&vio_bus_type);
1713 machine_fs_initcall(pseries, vio_init);