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>
25 #include <linux/kexec.h>
27 #include <asm/iommu.h>
31 #include <asm/firmware.h>
34 #include <asm/hvcall.h>
35 #include <asm/machdep.h>
37 static struct vio_dev vio_bus_device = { /* fake "parent" device */
40 .dev.init_name = "vio",
41 .dev.bus = &vio_bus_type,
44 #ifdef CONFIG_PPC_SMLPAR
46 * vio_cmo_pool - A pool of IO memory for CMO use
48 * @size: The size of the pool in bytes
49 * @free: The amount of free memory in the pool
56 /* How many ms to delay queued balance work */
57 #define VIO_CMO_BALANCE_DELAY 100
59 /* Portion out IO memory to CMO devices by this chunk size */
60 #define VIO_CMO_BALANCE_CHUNK 131072
63 * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement
65 * @vio_dev: struct vio_dev pointer
66 * @list: pointer to other devices on bus that are being tracked
68 struct vio_cmo_dev_entry {
69 struct vio_dev *viodev;
70 struct list_head list;
74 * vio_cmo - VIO bus accounting structure for CMO entitlement
76 * @lock: spinlock for entire structure
77 * @balance_q: work queue for balancing system entitlement
78 * @device_list: list of CMO-enabled devices requiring entitlement
79 * @entitled: total system entitlement in bytes
80 * @reserve: pool of memory from which devices reserve entitlement, incl. spare
81 * @excess: pool of excess entitlement not needed for device reserves or spare
82 * @spare: IO memory for device hotplug functionality
83 * @min: minimum necessary for system operation
84 * @desired: desired memory for system operation
85 * @curr: bytes currently allocated
86 * @high: high water mark for IO data usage
88 static struct vio_cmo {
90 struct delayed_work balance_q;
91 struct list_head device_list;
93 struct vio_cmo_pool reserve;
94 struct vio_cmo_pool excess;
103 * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows
105 static int vio_cmo_num_OF_devs(void)
107 struct device_node *node_vroot;
111 * Count the number of vdevice entries with an
112 * ibm,my-dma-window OF property
114 node_vroot = of_find_node_by_name(NULL, "vdevice");
116 struct device_node *of_node;
117 struct property *prop;
119 for_each_child_of_node(node_vroot, of_node) {
120 prop = of_find_property(of_node, "ibm,my-dma-window",
126 of_node_put(node_vroot);
131 * vio_cmo_alloc - allocate IO memory for CMO-enable devices
133 * @viodev: VIO device requesting IO memory
134 * @size: size of allocation requested
136 * Allocations come from memory reserved for the devices and any excess
137 * IO memory available to all devices. The spare pool used to service
138 * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be
142 * 0 for successful allocation and -ENOMEM for a failure
144 static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size)
147 size_t reserve_free = 0;
148 size_t excess_free = 0;
151 spin_lock_irqsave(&vio_cmo.lock, flags);
153 /* Determine the amount of free entitlement available in reserve */
154 if (viodev->cmo.entitled > viodev->cmo.allocated)
155 reserve_free = viodev->cmo.entitled - viodev->cmo.allocated;
157 /* If spare is not fulfilled, the excess pool can not be used. */
158 if (vio_cmo.spare >= VIO_CMO_MIN_ENT)
159 excess_free = vio_cmo.excess.free;
161 /* The request can be satisfied */
162 if ((reserve_free + excess_free) >= size) {
163 vio_cmo.curr += size;
164 if (vio_cmo.curr > vio_cmo.high)
165 vio_cmo.high = vio_cmo.curr;
166 viodev->cmo.allocated += size;
167 size -= min(reserve_free, size);
168 vio_cmo.excess.free -= size;
172 spin_unlock_irqrestore(&vio_cmo.lock, flags);
177 * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices
178 * @viodev: VIO device freeing IO memory
179 * @size: size of deallocation
181 * IO memory is freed by the device back to the correct memory pools.
182 * The spare pool is replenished first from either memory pool, then
183 * the reserve pool is used to reduce device entitlement, the excess
184 * pool is used to increase the reserve pool toward the desired entitlement
185 * target, and then the remaining memory is returned to the pools.
188 static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size)
191 size_t spare_needed = 0;
192 size_t excess_freed = 0;
193 size_t reserve_freed = size;
197 spin_lock_irqsave(&vio_cmo.lock, flags);
198 vio_cmo.curr -= size;
200 /* Amount of memory freed from the excess pool */
201 if (viodev->cmo.allocated > viodev->cmo.entitled) {
202 excess_freed = min(reserve_freed, (viodev->cmo.allocated -
203 viodev->cmo.entitled));
204 reserve_freed -= excess_freed;
207 /* Remove allocation from device */
208 viodev->cmo.allocated -= (reserve_freed + excess_freed);
210 /* Spare is a subset of the reserve pool, replenish it first. */
211 spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare;
214 * Replenish the spare in the reserve pool from the excess pool.
215 * This moves entitlement into the reserve pool.
217 if (spare_needed && excess_freed) {
218 tmp = min(excess_freed, spare_needed);
219 vio_cmo.excess.size -= tmp;
220 vio_cmo.reserve.size += tmp;
221 vio_cmo.spare += tmp;
228 * Replenish the spare in the reserve pool from the reserve pool.
229 * This removes entitlement from the device down to VIO_CMO_MIN_ENT,
230 * if needed, and gives it to the spare pool. The amount of used
231 * memory in this pool does not change.
233 if (spare_needed && reserve_freed) {
234 tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT));
236 vio_cmo.spare += tmp;
237 viodev->cmo.entitled -= tmp;
238 reserve_freed -= tmp;
244 * Increase the reserve pool until the desired allocation is met.
245 * Move an allocation freed from the excess pool into the reserve
246 * pool and schedule a balance operation.
248 if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) {
249 tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size));
251 vio_cmo.excess.size -= tmp;
252 vio_cmo.reserve.size += tmp;
257 /* Return memory from the excess pool to that pool */
259 vio_cmo.excess.free += excess_freed;
262 schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY);
263 spin_unlock_irqrestore(&vio_cmo.lock, flags);
267 * vio_cmo_entitlement_update - Manage system entitlement changes
269 * @new_entitlement: new system entitlement to attempt to accommodate
271 * Increases in entitlement will be used to fulfill the spare entitlement
272 * and the rest is given to the excess pool. Decreases, if they are
273 * possible, come from the excess pool and from unused device entitlement
275 * Returns: 0 on success, -ENOMEM when change can not be made
277 int vio_cmo_entitlement_update(size_t new_entitlement)
279 struct vio_dev *viodev;
280 struct vio_cmo_dev_entry *dev_ent;
282 size_t avail, delta, tmp;
284 spin_lock_irqsave(&vio_cmo.lock, flags);
286 /* Entitlement increases */
287 if (new_entitlement > vio_cmo.entitled) {
288 delta = new_entitlement - vio_cmo.entitled;
290 /* Fulfill spare allocation */
291 if (vio_cmo.spare < VIO_CMO_MIN_ENT) {
292 tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare));
293 vio_cmo.spare += tmp;
294 vio_cmo.reserve.size += tmp;
298 /* Remaining new allocation goes to the excess pool */
299 vio_cmo.entitled += delta;
300 vio_cmo.excess.size += delta;
301 vio_cmo.excess.free += delta;
306 /* Entitlement decreases */
307 delta = vio_cmo.entitled - new_entitlement;
308 avail = vio_cmo.excess.free;
311 * Need to check how much unused entitlement each device can
312 * sacrifice to fulfill entitlement change.
314 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
318 viodev = dev_ent->viodev;
319 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
320 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
321 avail += viodev->cmo.entitled -
322 max_t(size_t, viodev->cmo.allocated,
326 if (delta <= avail) {
327 vio_cmo.entitled -= delta;
329 /* Take entitlement from the excess pool first */
330 tmp = min(vio_cmo.excess.free, delta);
331 vio_cmo.excess.size -= tmp;
332 vio_cmo.excess.free -= tmp;
336 * Remove all but VIO_CMO_MIN_ENT bytes from devices
337 * until entitlement change is served
339 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
343 viodev = dev_ent->viodev;
345 if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
346 (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
347 tmp = viodev->cmo.entitled -
348 max_t(size_t, viodev->cmo.allocated,
350 viodev->cmo.entitled -= min(tmp, delta);
351 delta -= min(tmp, delta);
354 spin_unlock_irqrestore(&vio_cmo.lock, flags);
359 schedule_delayed_work(&vio_cmo.balance_q, 0);
360 spin_unlock_irqrestore(&vio_cmo.lock, flags);
365 * vio_cmo_balance - Balance entitlement among devices
367 * @work: work queue structure for this operation
369 * Any system entitlement above the minimum needed for devices, or
370 * already allocated to devices, can be distributed to the devices.
371 * The list of devices is iterated through to recalculate the desired
372 * entitlement level and to determine how much entitlement above the
373 * minimum entitlement is allocated to devices.
375 * Small chunks of the available entitlement are given to devices until
376 * their requirements are fulfilled or there is no entitlement left to give.
377 * Upon completion sizes of the reserve and excess pools are calculated.
379 * The system minimum entitlement level is also recalculated here.
380 * Entitlement will be reserved for devices even after vio_bus_remove to
381 * accommodate reloading the driver. The OF tree is walked to count the
382 * number of devices present and this will remove entitlement for devices
383 * that have actually left the system after having vio_bus_remove called.
385 static void vio_cmo_balance(struct work_struct *work)
388 struct vio_dev *viodev;
389 struct vio_cmo_dev_entry *dev_ent;
391 size_t avail = 0, level, chunk, need;
392 int devcount = 0, fulfilled;
394 cmo = container_of(work, struct vio_cmo, balance_q.work);
396 spin_lock_irqsave(&vio_cmo.lock, flags);
398 /* Calculate minimum entitlement and fulfill spare */
399 cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT;
400 BUG_ON(cmo->min > cmo->entitled);
401 cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min));
402 cmo->min += cmo->spare;
403 cmo->desired = cmo->min;
406 * Determine how much entitlement is available and reset device
409 avail = cmo->entitled - cmo->spare;
410 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
411 viodev = dev_ent->viodev;
413 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
414 cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT);
415 avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT);
419 * Having provided each device with the minimum entitlement, loop
420 * over the devices portioning out the remaining entitlement
421 * until there is nothing left.
423 level = VIO_CMO_MIN_ENT;
426 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
427 viodev = dev_ent->viodev;
429 if (viodev->cmo.desired <= level) {
435 * Give the device up to VIO_CMO_BALANCE_CHUNK
436 * bytes of entitlement, but do not exceed the
437 * desired level of entitlement for the device.
439 chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK);
440 chunk = min(chunk, (viodev->cmo.desired -
441 viodev->cmo.entitled));
442 viodev->cmo.entitled += chunk;
445 * If the memory for this entitlement increase was
446 * already allocated to the device it does not come
447 * from the available pool being portioned out.
449 need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
450 max(viodev->cmo.allocated, level);
454 if (fulfilled == devcount)
456 level += VIO_CMO_BALANCE_CHUNK;
459 /* Calculate new reserve and excess pool sizes */
460 cmo->reserve.size = cmo->min;
461 cmo->excess.free = 0;
462 cmo->excess.size = 0;
464 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
465 viodev = dev_ent->viodev;
466 /* Calculated reserve size above the minimum entitlement */
467 if (viodev->cmo.entitled)
468 cmo->reserve.size += (viodev->cmo.entitled -
470 /* Calculated used excess entitlement */
471 if (viodev->cmo.allocated > viodev->cmo.entitled)
472 need += viodev->cmo.allocated - viodev->cmo.entitled;
474 cmo->excess.size = cmo->entitled - cmo->reserve.size;
475 cmo->excess.free = cmo->excess.size - need;
477 cancel_delayed_work(to_delayed_work(work));
478 spin_unlock_irqrestore(&vio_cmo.lock, flags);
481 static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
482 dma_addr_t *dma_handle, gfp_t flag,
485 struct vio_dev *viodev = to_vio_dev(dev);
488 if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
489 atomic_inc(&viodev->cmo.allocs_failed);
493 ret = iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
494 dma_handle, dev->coherent_dma_mask, flag,
496 if (unlikely(ret == NULL)) {
497 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
498 atomic_inc(&viodev->cmo.allocs_failed);
504 static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
505 void *vaddr, dma_addr_t dma_handle,
508 struct vio_dev *viodev = to_vio_dev(dev);
510 iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle);
511 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
514 static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
515 unsigned long offset, size_t size,
516 enum dma_data_direction direction,
519 struct vio_dev *viodev = to_vio_dev(dev);
520 struct iommu_table *tbl = get_iommu_table_base(dev);
521 dma_addr_t ret = DMA_MAPPING_ERROR;
523 if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl))))
525 ret = iommu_map_page(dev, tbl, page, offset, size, dma_get_mask(dev),
527 if (unlikely(ret == DMA_MAPPING_ERROR))
532 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
534 atomic_inc(&viodev->cmo.allocs_failed);
535 return DMA_MAPPING_ERROR;
538 static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
540 enum dma_data_direction direction,
543 struct vio_dev *viodev = to_vio_dev(dev);
544 struct iommu_table *tbl = get_iommu_table_base(dev);
546 iommu_unmap_page(tbl, dma_handle, size, direction, attrs);
547 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
550 static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
551 int nelems, enum dma_data_direction direction,
554 struct vio_dev *viodev = to_vio_dev(dev);
555 struct iommu_table *tbl = get_iommu_table_base(dev);
556 struct scatterlist *sgl;
558 size_t alloc_size = 0;
560 for_each_sg(sglist, sgl, nelems, count)
561 alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
563 ret = vio_cmo_alloc(viodev, alloc_size);
566 ret = ppc_iommu_map_sg(dev, tbl, sglist, nelems, dma_get_mask(dev),
571 for_each_sg(sglist, sgl, ret, count)
572 alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
574 vio_cmo_dealloc(viodev, alloc_size);
578 vio_cmo_dealloc(viodev, alloc_size);
580 atomic_inc(&viodev->cmo.allocs_failed);
584 static void vio_dma_iommu_unmap_sg(struct device *dev,
585 struct scatterlist *sglist, int nelems,
586 enum dma_data_direction direction,
589 struct vio_dev *viodev = to_vio_dev(dev);
590 struct iommu_table *tbl = get_iommu_table_base(dev);
591 struct scatterlist *sgl;
592 size_t alloc_size = 0;
595 for_each_sg(sglist, sgl, nelems, count)
596 alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
598 ppc_iommu_unmap_sg(tbl, sglist, nelems, direction, attrs);
599 vio_cmo_dealloc(viodev, alloc_size);
602 static const struct dma_map_ops vio_dma_mapping_ops = {
603 .alloc = vio_dma_iommu_alloc_coherent,
604 .free = vio_dma_iommu_free_coherent,
605 .map_sg = vio_dma_iommu_map_sg,
606 .unmap_sg = vio_dma_iommu_unmap_sg,
607 .map_page = vio_dma_iommu_map_page,
608 .unmap_page = vio_dma_iommu_unmap_page,
609 .dma_supported = dma_iommu_dma_supported,
610 .get_required_mask = dma_iommu_get_required_mask,
611 .mmap = dma_common_mmap,
612 .get_sgtable = dma_common_get_sgtable,
613 .alloc_pages = dma_common_alloc_pages,
614 .free_pages = dma_common_free_pages,
618 * vio_cmo_set_dev_desired - Set desired entitlement for a device
620 * @viodev: struct vio_dev for device to alter
621 * @desired: new desired entitlement level in bytes
623 * For use by devices to request a change to their entitlement at runtime or
624 * through sysfs. The desired entitlement level is changed and a balancing
625 * of system resources is scheduled to run in the future.
627 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired)
630 struct vio_cmo_dev_entry *dev_ent;
633 if (!firmware_has_feature(FW_FEATURE_CMO))
636 spin_lock_irqsave(&vio_cmo.lock, flags);
637 if (desired < VIO_CMO_MIN_ENT)
638 desired = VIO_CMO_MIN_ENT;
641 * Changes will not be made for devices not in the device list.
642 * If it is not in the device list, then no driver is loaded
643 * for the device and it can not receive entitlement.
645 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
646 if (viodev == dev_ent->viodev) {
651 spin_unlock_irqrestore(&vio_cmo.lock, flags);
655 /* Increase/decrease in desired device entitlement */
656 if (desired >= viodev->cmo.desired) {
657 /* Just bump the bus and device values prior to a balance*/
658 vio_cmo.desired += desired - viodev->cmo.desired;
659 viodev->cmo.desired = desired;
661 /* Decrease bus and device values for desired entitlement */
662 vio_cmo.desired -= viodev->cmo.desired - desired;
663 viodev->cmo.desired = desired;
665 * If less entitlement is desired than current entitlement, move
666 * any reserve memory in the change region to the excess pool.
668 if (viodev->cmo.entitled > desired) {
669 vio_cmo.reserve.size -= viodev->cmo.entitled - desired;
670 vio_cmo.excess.size += viodev->cmo.entitled - desired;
672 * If entitlement moving from the reserve pool to the
673 * excess pool is currently unused, add to the excess
676 if (viodev->cmo.allocated < viodev->cmo.entitled)
677 vio_cmo.excess.free += viodev->cmo.entitled -
678 max(viodev->cmo.allocated, desired);
679 viodev->cmo.entitled = desired;
682 schedule_delayed_work(&vio_cmo.balance_q, 0);
683 spin_unlock_irqrestore(&vio_cmo.lock, flags);
687 * vio_cmo_bus_probe - Handle CMO specific bus probe activities
689 * @viodev - Pointer to struct vio_dev for device
691 * Determine the devices IO memory entitlement needs, attempting
692 * to satisfy the system minimum entitlement at first and scheduling
693 * a balance operation to take care of the rest at a later time.
695 * Returns: 0 on success, -EINVAL when device doesn't support CMO, and
696 * -ENOMEM when entitlement is not available for device or
700 static int vio_cmo_bus_probe(struct vio_dev *viodev)
702 struct vio_cmo_dev_entry *dev_ent;
703 struct device *dev = &viodev->dev;
704 struct iommu_table *tbl;
705 struct vio_driver *viodrv = to_vio_driver(dev->driver);
708 bool dma_capable = false;
710 tbl = get_iommu_table_base(dev);
712 /* A device requires entitlement if it has a DMA window property */
713 switch (viodev->family) {
715 if (of_get_property(viodev->dev.of_node,
716 "ibm,my-dma-window", NULL))
723 dev_warn(dev, "unknown device family: %d\n", viodev->family);
728 /* Configure entitlement for the device. */
730 /* Check that the driver is CMO enabled and get desired DMA */
731 if (!viodrv->get_desired_dma) {
732 dev_err(dev, "%s: device driver does not support CMO\n",
737 viodev->cmo.desired =
738 IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev), tbl);
739 if (viodev->cmo.desired < VIO_CMO_MIN_ENT)
740 viodev->cmo.desired = VIO_CMO_MIN_ENT;
741 size = VIO_CMO_MIN_ENT;
743 dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry),
748 dev_ent->viodev = viodev;
749 spin_lock_irqsave(&vio_cmo.lock, flags);
750 list_add(&dev_ent->list, &vio_cmo.device_list);
752 viodev->cmo.desired = 0;
754 spin_lock_irqsave(&vio_cmo.lock, flags);
758 * If the needs for vio_cmo.min have not changed since they
759 * were last set, the number of devices in the OF tree has
760 * been constant and the IO memory for this is already in
763 if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) *
765 /* Updated desired entitlement if device requires it */
767 vio_cmo.desired += (viodev->cmo.desired -
772 tmp = vio_cmo.spare + vio_cmo.excess.free;
774 dev_err(dev, "%s: insufficient free "
775 "entitlement to add device. "
776 "Need %lu, have %lu\n", __func__,
777 size, (vio_cmo.spare + tmp));
778 spin_unlock_irqrestore(&vio_cmo.lock, flags);
782 /* Use excess pool first to fulfill request */
783 tmp = min(size, vio_cmo.excess.free);
784 vio_cmo.excess.free -= tmp;
785 vio_cmo.excess.size -= tmp;
786 vio_cmo.reserve.size += tmp;
788 /* Use spare if excess pool was insufficient */
789 vio_cmo.spare -= size - tmp;
791 /* Update bus accounting */
793 vio_cmo.desired += viodev->cmo.desired;
795 spin_unlock_irqrestore(&vio_cmo.lock, flags);
800 * vio_cmo_bus_remove - Handle CMO specific bus removal activities
802 * @viodev - Pointer to struct vio_dev for device
804 * Remove the device from the cmo device list. The minimum entitlement
805 * will be reserved for the device as long as it is in the system. The
806 * rest of the entitlement the device had been allocated will be returned
809 static void vio_cmo_bus_remove(struct vio_dev *viodev)
811 struct vio_cmo_dev_entry *dev_ent;
815 spin_lock_irqsave(&vio_cmo.lock, flags);
816 if (viodev->cmo.allocated) {
817 dev_err(&viodev->dev, "%s: device had %lu bytes of IO "
818 "allocated after remove operation.\n",
819 __func__, viodev->cmo.allocated);
824 * Remove the device from the device list being maintained for
825 * CMO enabled devices.
827 list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
828 if (viodev == dev_ent->viodev) {
829 list_del(&dev_ent->list);
835 * Devices may not require any entitlement and they do not need
836 * to be processed. Otherwise, return the device's entitlement
839 if (viodev->cmo.entitled) {
841 * This device has not yet left the OF tree, it's
842 * minimum entitlement remains in vio_cmo.min and
845 vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT);
848 * Save min allocation for device in reserve as long
849 * as it exists in OF tree as determined by later
852 viodev->cmo.entitled -= VIO_CMO_MIN_ENT;
854 /* Replenish spare from freed reserve pool */
855 if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) {
856 tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT -
858 vio_cmo.spare += tmp;
859 viodev->cmo.entitled -= tmp;
862 /* Remaining reserve goes to excess pool */
863 vio_cmo.excess.size += viodev->cmo.entitled;
864 vio_cmo.excess.free += viodev->cmo.entitled;
865 vio_cmo.reserve.size -= viodev->cmo.entitled;
868 * Until the device is removed it will keep a
869 * minimum entitlement; this will guarantee that
870 * a module unload/load will result in a success.
872 viodev->cmo.entitled = VIO_CMO_MIN_ENT;
873 viodev->cmo.desired = VIO_CMO_MIN_ENT;
874 atomic_set(&viodev->cmo.allocs_failed, 0);
877 spin_unlock_irqrestore(&vio_cmo.lock, flags);
880 static void vio_cmo_set_dma_ops(struct vio_dev *viodev)
882 set_dma_ops(&viodev->dev, &vio_dma_mapping_ops);
886 * vio_cmo_bus_init - CMO entitlement initialization at bus init time
888 * Set up the reserve and excess entitlement pools based on available
889 * system entitlement and the number of devices in the OF tree that
890 * require entitlement in the reserve pool.
892 static void vio_cmo_bus_init(void)
894 struct hvcall_mpp_data mpp_data;
897 memset(&vio_cmo, 0, sizeof(struct vio_cmo));
898 spin_lock_init(&vio_cmo.lock);
899 INIT_LIST_HEAD(&vio_cmo.device_list);
900 INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance);
902 /* Get current system entitlement */
903 err = h_get_mpp(&mpp_data);
906 * On failure, continue with entitlement set to 0, will panic()
907 * later when spare is reserved.
909 if (err != H_SUCCESS) {
910 printk(KERN_ERR "%s: unable to determine system IO "\
911 "entitlement. (%d)\n", __func__, err);
912 vio_cmo.entitled = 0;
914 vio_cmo.entitled = mpp_data.entitled_mem;
917 /* Set reservation and check against entitlement */
918 vio_cmo.spare = VIO_CMO_MIN_ENT;
919 vio_cmo.reserve.size = vio_cmo.spare;
920 vio_cmo.reserve.size += (vio_cmo_num_OF_devs() *
922 if (vio_cmo.reserve.size > vio_cmo.entitled) {
923 printk(KERN_ERR "%s: insufficient system entitlement\n",
925 panic("%s: Insufficient system entitlement", __func__);
928 /* Set the remaining accounting variables */
929 vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size;
930 vio_cmo.excess.free = vio_cmo.excess.size;
931 vio_cmo.min = vio_cmo.reserve.size;
932 vio_cmo.desired = vio_cmo.reserve.size;
935 /* sysfs device functions and data structures for CMO */
937 #define viodev_cmo_rd_attr(name) \
938 static ssize_t cmo_##name##_show(struct device *dev, \
939 struct device_attribute *attr, \
942 return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name); \
945 static ssize_t cmo_allocs_failed_show(struct device *dev,
946 struct device_attribute *attr, char *buf)
948 struct vio_dev *viodev = to_vio_dev(dev);
949 return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
952 static ssize_t cmo_allocs_failed_store(struct device *dev,
953 struct device_attribute *attr, const char *buf, size_t count)
955 struct vio_dev *viodev = to_vio_dev(dev);
956 atomic_set(&viodev->cmo.allocs_failed, 0);
960 static ssize_t cmo_desired_store(struct device *dev,
961 struct device_attribute *attr, const char *buf, size_t count)
963 struct vio_dev *viodev = to_vio_dev(dev);
967 ret = kstrtoul(buf, 10, &new_desired);
971 vio_cmo_set_dev_desired(viodev, new_desired);
975 viodev_cmo_rd_attr(desired);
976 viodev_cmo_rd_attr(entitled);
977 viodev_cmo_rd_attr(allocated);
979 static ssize_t name_show(struct device *, struct device_attribute *, char *);
980 static ssize_t devspec_show(struct device *, struct device_attribute *, char *);
981 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
984 static struct device_attribute dev_attr_name;
985 static struct device_attribute dev_attr_devspec;
986 static struct device_attribute dev_attr_modalias;
988 static DEVICE_ATTR_RO(cmo_entitled);
989 static DEVICE_ATTR_RO(cmo_allocated);
990 static DEVICE_ATTR_RW(cmo_desired);
991 static DEVICE_ATTR_RW(cmo_allocs_failed);
993 static struct attribute *vio_cmo_dev_attrs[] = {
995 &dev_attr_devspec.attr,
996 &dev_attr_modalias.attr,
997 &dev_attr_cmo_entitled.attr,
998 &dev_attr_cmo_allocated.attr,
999 &dev_attr_cmo_desired.attr,
1000 &dev_attr_cmo_allocs_failed.attr,
1003 ATTRIBUTE_GROUPS(vio_cmo_dev);
1005 /* sysfs bus functions and data structures for CMO */
1007 #define viobus_cmo_rd_attr(name) \
1008 static ssize_t cmo_bus_##name##_show(struct bus_type *bt, char *buf) \
1010 return sprintf(buf, "%lu\n", vio_cmo.name); \
1012 static struct bus_attribute bus_attr_cmo_bus_##name = \
1013 __ATTR(cmo_##name, S_IRUGO, cmo_bus_##name##_show, NULL)
1015 #define viobus_cmo_pool_rd_attr(name, var) \
1017 cmo_##name##_##var##_show(struct bus_type *bt, char *buf) \
1019 return sprintf(buf, "%lu\n", vio_cmo.name.var); \
1021 static BUS_ATTR_RO(cmo_##name##_##var)
1023 viobus_cmo_rd_attr(entitled);
1024 viobus_cmo_rd_attr(spare);
1025 viobus_cmo_rd_attr(min);
1026 viobus_cmo_rd_attr(desired);
1027 viobus_cmo_rd_attr(curr);
1028 viobus_cmo_pool_rd_attr(reserve, size);
1029 viobus_cmo_pool_rd_attr(excess, size);
1030 viobus_cmo_pool_rd_attr(excess, free);
1032 static ssize_t cmo_high_show(struct bus_type *bt, char *buf)
1034 return sprintf(buf, "%lu\n", vio_cmo.high);
1037 static ssize_t cmo_high_store(struct bus_type *bt, const char *buf,
1040 unsigned long flags;
1042 spin_lock_irqsave(&vio_cmo.lock, flags);
1043 vio_cmo.high = vio_cmo.curr;
1044 spin_unlock_irqrestore(&vio_cmo.lock, flags);
1048 static BUS_ATTR_RW(cmo_high);
1050 static struct attribute *vio_bus_attrs[] = {
1051 &bus_attr_cmo_bus_entitled.attr,
1052 &bus_attr_cmo_bus_spare.attr,
1053 &bus_attr_cmo_bus_min.attr,
1054 &bus_attr_cmo_bus_desired.attr,
1055 &bus_attr_cmo_bus_curr.attr,
1056 &bus_attr_cmo_high.attr,
1057 &bus_attr_cmo_reserve_size.attr,
1058 &bus_attr_cmo_excess_size.attr,
1059 &bus_attr_cmo_excess_free.attr,
1062 ATTRIBUTE_GROUPS(vio_bus);
1064 static void vio_cmo_sysfs_init(void)
1066 vio_bus_type.dev_groups = vio_cmo_dev_groups;
1067 vio_bus_type.bus_groups = vio_bus_groups;
1069 #else /* CONFIG_PPC_SMLPAR */
1070 int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; }
1071 void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {}
1072 static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; }
1073 static void vio_cmo_bus_remove(struct vio_dev *viodev) {}
1074 static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {}
1075 static void vio_cmo_bus_init(void) {}
1076 static void vio_cmo_sysfs_init(void) { }
1077 #endif /* CONFIG_PPC_SMLPAR */
1078 EXPORT_SYMBOL(vio_cmo_entitlement_update);
1079 EXPORT_SYMBOL(vio_cmo_set_dev_desired);
1083 * Platform Facilities Option (PFO) support
1087 * vio_h_cop_sync - Perform a synchronous PFO co-processor operation
1089 * @vdev - Pointer to a struct vio_dev for device
1090 * @op - Pointer to a struct vio_pfo_op for the operation parameters
1092 * Calls the hypervisor to synchronously perform the PFO operation
1093 * described in @op. In the case of a busy response from the hypervisor,
1094 * the operation will be re-submitted indefinitely unless a non-zero timeout
1095 * is specified or an error occurs. The timeout places a limit on when to
1096 * stop re-submitting a operation, the total time can be exceeded if an
1097 * operation is in progress.
1099 * If op->hcall_ret is not NULL, this will be set to the return from the
1100 * last h_cop_op call or it will be 0 if an error not involving the h_call
1105 * -EINVAL if the h_call fails due to an invalid parameter,
1106 * -E2BIG if the h_call can not be performed synchronously,
1107 * -EBUSY if a timeout is specified and has elapsed,
1108 * -EACCES if the memory area for data/status has been rescinded, or
1109 * -EPERM if a hardware fault has been indicated
1111 int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op)
1113 struct device *dev = &vdev->dev;
1114 unsigned long deadline = 0;
1119 deadline = jiffies + msecs_to_jiffies(op->timeout);
1122 hret = plpar_hcall_norets(H_COP, op->flags,
1124 op->in, op->inlen, op->out,
1125 op->outlen, op->csbcpb);
1127 if (hret == H_SUCCESS ||
1128 (hret != H_NOT_ENOUGH_RESOURCES &&
1129 hret != H_BUSY && hret != H_RESOURCE) ||
1130 (op->timeout && time_after(deadline, jiffies)))
1133 dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret);
1150 case H_NOT_ENOUGH_RESOURCES:
1161 dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n",
1162 __func__, ret, hret);
1164 op->hcall_err = hret;
1167 EXPORT_SYMBOL(vio_h_cop_sync);
1169 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
1171 const __be32 *dma_window;
1172 struct iommu_table *tbl;
1173 unsigned long offset, size;
1175 dma_window = of_get_property(dev->dev.of_node,
1176 "ibm,my-dma-window", NULL);
1180 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
1184 kref_init(&tbl->it_kref);
1186 of_parse_dma_window(dev->dev.of_node, dma_window,
1187 &tbl->it_index, &offset, &size);
1189 /* TCE table size - measured in tce entries */
1190 tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
1191 tbl->it_size = size >> tbl->it_page_shift;
1192 /* offset for VIO should always be 0 */
1193 tbl->it_offset = offset >> tbl->it_page_shift;
1195 tbl->it_type = TCE_VB;
1196 tbl->it_blocksize = 16;
1198 if (firmware_has_feature(FW_FEATURE_LPAR))
1199 tbl->it_ops = &iommu_table_lpar_multi_ops;
1201 tbl->it_ops = &iommu_table_pseries_ops;
1203 return iommu_init_table(tbl, -1, 0, 0);
1207 * vio_match_device: - Tell if a VIO device has a matching
1208 * VIO device id structure.
1209 * @ids: array of VIO device id structures to search in
1210 * @dev: the VIO device structure to match against
1212 * Used by a driver to check whether a VIO device present in the
1213 * system is in its list of supported devices. Returns the matching
1214 * vio_device_id structure or NULL if there is no match.
1216 static const struct vio_device_id *vio_match_device(
1217 const struct vio_device_id *ids, const struct vio_dev *dev)
1219 while (ids->type[0] != '\0') {
1220 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
1221 of_device_is_compatible(dev->dev.of_node,
1230 * Convert from struct device to struct vio_dev and pass to driver.
1231 * dev->driver has already been set by generic code because vio_bus_match
1234 static int vio_bus_probe(struct device *dev)
1236 struct vio_dev *viodev = to_vio_dev(dev);
1237 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1238 const struct vio_device_id *id;
1239 int error = -ENODEV;
1244 id = vio_match_device(viodrv->id_table, viodev);
1246 memset(&viodev->cmo, 0, sizeof(viodev->cmo));
1247 if (firmware_has_feature(FW_FEATURE_CMO)) {
1248 error = vio_cmo_bus_probe(viodev);
1252 error = viodrv->probe(viodev, id);
1253 if (error && firmware_has_feature(FW_FEATURE_CMO))
1254 vio_cmo_bus_remove(viodev);
1260 /* convert from struct device to struct vio_dev and pass to driver. */
1261 static void vio_bus_remove(struct device *dev)
1263 struct vio_dev *viodev = to_vio_dev(dev);
1264 struct vio_driver *viodrv = to_vio_driver(dev->driver);
1265 struct device *devptr;
1268 * Hold a reference to the device after the remove function is called
1269 * to allow for CMO accounting cleanup for the device.
1271 devptr = get_device(dev);
1274 viodrv->remove(viodev);
1276 if (firmware_has_feature(FW_FEATURE_CMO))
1277 vio_cmo_bus_remove(viodev);
1282 static void vio_bus_shutdown(struct device *dev)
1284 struct vio_dev *viodev = to_vio_dev(dev);
1285 struct vio_driver *viodrv;
1288 viodrv = to_vio_driver(dev->driver);
1289 if (viodrv->shutdown)
1290 viodrv->shutdown(viodev);
1291 else if (kexec_in_progress)
1292 vio_bus_remove(dev);
1297 * vio_register_driver: - Register a new vio driver
1298 * @viodrv: The vio_driver structure to be registered.
1300 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
1301 const char *mod_name)
1303 // vio_bus_type is only initialised for pseries
1304 if (!machine_is(pseries))
1307 pr_debug("%s: driver %s registering\n", __func__, viodrv->name);
1309 /* fill in 'struct driver' fields */
1310 viodrv->driver.name = viodrv->name;
1311 viodrv->driver.pm = viodrv->pm;
1312 viodrv->driver.bus = &vio_bus_type;
1313 viodrv->driver.owner = owner;
1314 viodrv->driver.mod_name = mod_name;
1316 return driver_register(&viodrv->driver);
1318 EXPORT_SYMBOL(__vio_register_driver);
1321 * vio_unregister_driver - Remove registration of vio driver.
1322 * @viodrv: The vio_driver struct to be removed form registration
1324 void vio_unregister_driver(struct vio_driver *viodrv)
1326 driver_unregister(&viodrv->driver);
1328 EXPORT_SYMBOL(vio_unregister_driver);
1330 /* vio_dev refcount hit 0 */
1331 static void vio_dev_release(struct device *dev)
1333 struct iommu_table *tbl = get_iommu_table_base(dev);
1336 iommu_tce_table_put(tbl);
1337 of_node_put(dev->of_node);
1338 kfree(to_vio_dev(dev));
1342 * vio_register_device_node: - Register a new vio device.
1343 * @of_node: The OF node for this device.
1345 * Creates and initializes a vio_dev structure from the data in
1346 * of_node and adds it to the list of virtual devices.
1347 * Returns a pointer to the created vio_dev or NULL if node has
1348 * NULL device_type or compatible fields.
1350 struct vio_dev *vio_register_device_node(struct device_node *of_node)
1352 struct vio_dev *viodev;
1353 struct device_node *parent_node;
1355 enum vio_dev_family family;
1358 * Determine if this node is a under the /vdevice node or under the
1359 * /ibm,platform-facilities node. This decides the device's family.
1361 parent_node = of_get_parent(of_node);
1363 if (of_node_is_type(parent_node, "ibm,platform-facilities"))
1365 else if (of_node_is_type(parent_node, "vdevice"))
1368 pr_warn("%s: parent(%pOF) of %pOFn not recognized.\n",
1372 of_node_put(parent_node);
1375 of_node_put(parent_node);
1377 pr_warn("%s: could not determine the parent of node %pOFn.\n",
1382 if (family == PFO) {
1383 if (of_get_property(of_node, "interrupt-controller", NULL)) {
1384 pr_debug("%s: Skipping the interrupt controller %pOFn.\n",
1390 /* allocate a vio_dev for this node */
1391 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
1392 if (viodev == NULL) {
1393 pr_warn("%s: allocation failure for VIO device.\n", __func__);
1397 /* we need the 'device_type' property, in order to match with drivers */
1398 viodev->family = family;
1399 if (viodev->family == VDEVICE) {
1400 unsigned int unit_address;
1402 viodev->type = of_node_get_device_type(of_node);
1403 if (!viodev->type) {
1404 pr_warn("%s: node %pOFn is missing the 'device_type' "
1405 "property.\n", __func__, of_node);
1409 prop = of_get_property(of_node, "reg", NULL);
1411 pr_warn("%s: node %pOFn missing 'reg'\n",
1415 unit_address = of_read_number(prop, 1);
1416 dev_set_name(&viodev->dev, "%x", unit_address);
1417 viodev->irq = irq_of_parse_and_map(of_node, 0);
1418 viodev->unit_address = unit_address;
1420 /* PFO devices need their resource_id for submitting COP_OPs
1421 * This is an optional field for devices, but is required when
1422 * performing synchronous ops */
1423 prop = of_get_property(of_node, "ibm,resource-id", NULL);
1425 viodev->resource_id = of_read_number(prop, 1);
1427 dev_set_name(&viodev->dev, "%pOFn", of_node);
1428 viodev->type = dev_name(&viodev->dev);
1432 viodev->name = of_node->name;
1433 viodev->dev.of_node = of_node_get(of_node);
1435 set_dev_node(&viodev->dev, of_node_to_nid(of_node));
1437 /* init generic 'struct device' fields: */
1438 viodev->dev.parent = &vio_bus_device.dev;
1439 viodev->dev.bus = &vio_bus_type;
1440 viodev->dev.release = vio_dev_release;
1442 if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) {
1443 if (firmware_has_feature(FW_FEATURE_CMO))
1444 vio_cmo_set_dma_ops(viodev);
1446 set_dma_ops(&viodev->dev, &dma_iommu_ops);
1448 set_iommu_table_base(&viodev->dev,
1449 vio_build_iommu_table(viodev));
1451 /* needed to ensure proper operation of coherent allocations
1452 * later, in case driver doesn't set it explicitly */
1453 viodev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
1454 viodev->dev.dma_mask = &viodev->dev.coherent_dma_mask;
1457 /* register with generic device framework */
1458 if (device_register(&viodev->dev)) {
1459 printk(KERN_ERR "%s: failed to register device %s\n",
1460 __func__, dev_name(&viodev->dev));
1461 put_device(&viodev->dev);
1467 out: /* Use this exit point for any return prior to device_register */
1472 EXPORT_SYMBOL(vio_register_device_node);
1475 * vio_bus_scan_for_devices - Scan OF and register each child device
1476 * @root_name - OF node name for the root of the subtree to search.
1477 * This must be non-NULL
1479 * Starting from the root node provide, register the device node for
1480 * each child beneath the root.
1482 static void vio_bus_scan_register_devices(char *root_name)
1484 struct device_node *node_root, *node_child;
1489 node_root = of_find_node_by_name(NULL, root_name);
1493 * Create struct vio_devices for each virtual device in
1494 * the device tree. Drivers will associate with them later.
1496 node_child = of_get_next_child(node_root, NULL);
1497 while (node_child) {
1498 vio_register_device_node(node_child);
1499 node_child = of_get_next_child(node_root, node_child);
1501 of_node_put(node_root);
1506 * vio_bus_init: - Initialize the virtual IO bus
1508 static int __init vio_bus_init(void)
1512 if (firmware_has_feature(FW_FEATURE_CMO))
1513 vio_cmo_sysfs_init();
1515 err = bus_register(&vio_bus_type);
1517 printk(KERN_ERR "failed to register VIO bus\n");
1522 * The fake parent of all vio devices, just to give us
1525 err = device_register(&vio_bus_device.dev);
1527 printk(KERN_WARNING "%s: device_register returned %i\n",
1532 if (firmware_has_feature(FW_FEATURE_CMO))
1537 machine_postcore_initcall(pseries, vio_bus_init);
1539 static int __init vio_device_init(void)
1541 vio_bus_scan_register_devices("vdevice");
1542 vio_bus_scan_register_devices("ibm,platform-facilities");
1546 machine_device_initcall(pseries, vio_device_init);
1548 static ssize_t name_show(struct device *dev,
1549 struct device_attribute *attr, char *buf)
1551 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
1553 static DEVICE_ATTR_RO(name);
1555 static ssize_t devspec_show(struct device *dev,
1556 struct device_attribute *attr, char *buf)
1558 struct device_node *of_node = dev->of_node;
1560 return sprintf(buf, "%pOF\n", of_node);
1562 static DEVICE_ATTR_RO(devspec);
1564 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
1567 const struct vio_dev *vio_dev = to_vio_dev(dev);
1568 struct device_node *dn;
1576 cp = of_get_property(dn, "compatible", NULL);
1582 return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
1584 static DEVICE_ATTR_RO(modalias);
1586 static struct attribute *vio_dev_attrs[] = {
1587 &dev_attr_name.attr,
1588 &dev_attr_devspec.attr,
1589 &dev_attr_modalias.attr,
1592 ATTRIBUTE_GROUPS(vio_dev);
1594 void vio_unregister_device(struct vio_dev *viodev)
1596 device_unregister(&viodev->dev);
1597 if (viodev->family == VDEVICE)
1598 irq_dispose_mapping(viodev->irq);
1600 EXPORT_SYMBOL(vio_unregister_device);
1602 static int vio_bus_match(struct device *dev, struct device_driver *drv)
1604 const struct vio_dev *vio_dev = to_vio_dev(dev);
1605 struct vio_driver *vio_drv = to_vio_driver(drv);
1606 const struct vio_device_id *ids = vio_drv->id_table;
1608 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
1611 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
1613 const struct vio_dev *vio_dev = to_vio_dev(dev);
1614 struct device_node *dn;
1620 cp = of_get_property(dn, "compatible", NULL);
1624 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
1628 struct bus_type vio_bus_type = {
1630 .dev_groups = vio_dev_groups,
1631 .uevent = vio_hotplug,
1632 .match = vio_bus_match,
1633 .probe = vio_bus_probe,
1634 .remove = vio_bus_remove,
1635 .shutdown = vio_bus_shutdown,
1639 * vio_get_attribute: - get attribute for virtual device
1640 * @vdev: The vio device to get property.
1641 * @which: The property/attribute to be extracted.
1642 * @length: Pointer to length of returned data size (unused if NULL).
1644 * Calls prom.c's of_get_property() to return the value of the
1645 * attribute specified by @which
1647 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
1649 return of_get_property(vdev->dev.of_node, which, length);
1651 EXPORT_SYMBOL(vio_get_attribute);
1653 /* vio_find_name() - internal because only vio.c knows how we formatted the
1656 static struct vio_dev *vio_find_name(const char *name)
1658 struct device *found;
1660 found = bus_find_device_by_name(&vio_bus_type, NULL, name);
1664 return to_vio_dev(found);
1668 * vio_find_node - find an already-registered vio_dev
1669 * @vnode: device_node of the virtual device we're looking for
1671 * Takes a reference to the embedded struct device which needs to be dropped
1674 struct vio_dev *vio_find_node(struct device_node *vnode)
1677 struct device_node *vnode_parent;
1679 vnode_parent = of_get_parent(vnode);
1683 /* construct the kobject name from the device node */
1684 if (of_node_is_type(vnode_parent, "vdevice")) {
1687 prop = of_get_property(vnode, "reg", NULL);
1690 snprintf(kobj_name, sizeof(kobj_name), "%x",
1691 (uint32_t)of_read_number(prop, 1));
1692 } else if (of_node_is_type(vnode_parent, "ibm,platform-facilities"))
1693 snprintf(kobj_name, sizeof(kobj_name), "%pOFn", vnode);
1697 of_node_put(vnode_parent);
1698 return vio_find_name(kobj_name);
1700 of_node_put(vnode_parent);
1703 EXPORT_SYMBOL(vio_find_node);
1705 int vio_enable_interrupts(struct vio_dev *dev)
1707 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
1708 if (rc != H_SUCCESS)
1709 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
1712 EXPORT_SYMBOL(vio_enable_interrupts);
1714 int vio_disable_interrupts(struct vio_dev *dev)
1716 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
1717 if (rc != H_SUCCESS)
1718 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
1721 EXPORT_SYMBOL(vio_disable_interrupts);
1723 static int __init vio_init(void)
1725 dma_debug_add_bus(&vio_bus_type);
1728 machine_fs_initcall(pseries, vio_init);