powerpc/pseries: Move vio.c into platforms pseries

vio.c is pseries only code, so move it in there.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 0 insertions, 1706 deletions

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 1925341dbb9c..9c57ebf61e4d 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -58,7 +58,6 @@ obj-$(CONFIG_PPC_RTAS)		+= rtas.o rtas-rtc.o $(rtaspci-y-y)
 obj-$(CONFIG_PPC_RTAS_DAEMON)	+= rtasd.o
 obj-$(CONFIG_RTAS_FLASH)	+= rtas_flash.o
 obj-$(CONFIG_RTAS_PROC)		+= rtas-proc.o
-obj-$(CONFIG_IBMVIO)		+= vio.o
 obj-$(CONFIG_IBMEBUS)           += ibmebus.o
 obj-$(CONFIG_EEH)              += eeh.o eeh_pe.o eeh_dev.o eeh_cache.o \
 				  eeh_driver.o eeh_event.o eeh_sysfs.o
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
deleted file mode 100644
index 2c8fb3ec989e..000000000000
--- a/arch/powerpc/kernel/vio.c
+++ /dev/null
@@ -1,1705 +0,0 @@
-/*
- * IBM PowerPC Virtual I/O Infrastructure Support.
- *
- *    Copyright (c) 2003,2008 IBM Corp.
- *     Dave Engebretsen engebret@us.ibm.com
- *     Santiago Leon santil@us.ibm.com
- *     Hollis Blanchard <hollisb@us.ibm.com>
- *     Stephen Rothwell
- *     Robert Jennings <rcjenn@us.ibm.com>
- *
- *      This program is free software; you can redistribute it and/or
- *      modify it under the terms of the GNU General Public License
- *      as published by the Free Software Foundation; either version
- *      2 of the License, or (at your option) any later version.
- */
-
-#include <linux/cpu.h>
-#include <linux/types.h>
-#include <linux/delay.h>
-#include <linux/stat.h>
-#include <linux/device.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/console.h>
-#include <linux/export.h>
-#include <linux/mm.h>
-#include <linux/dma-mapping.h>
-#include <linux/kobject.h>
-
-#include <asm/iommu.h>
-#include <asm/dma.h>
-#include <asm/vio.h>
-#include <asm/prom.h>
-#include <asm/firmware.h>
-#include <asm/tce.h>
-#include <asm/page.h>
-#include <asm/hvcall.h>
-
-static struct vio_dev vio_bus_device  = { /* fake "parent" device */
-	.name = "vio",
-	.type = "",
-	.dev.init_name = "vio",
-	.dev.bus = &vio_bus_type,
-};
-
-#ifdef CONFIG_PPC_SMLPAR
-/**
- * vio_cmo_pool - A pool of IO memory for CMO use
- *
- * @size: The size of the pool in bytes
- * @free: The amount of free memory in the pool
- */
-struct vio_cmo_pool {
-	size_t size;
-	size_t free;
-};
-
-/* How many ms to delay queued balance work */
-#define VIO_CMO_BALANCE_DELAY 100
-
-/* Portion out IO memory to CMO devices by this chunk size */
-#define VIO_CMO_BALANCE_CHUNK 131072
-
-/**
- * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement
- *
- * @vio_dev: struct vio_dev pointer
- * @list: pointer to other devices on bus that are being tracked
- */
-struct vio_cmo_dev_entry {
-	struct vio_dev *viodev;
-	struct list_head list;
-};
-
-/**
- * vio_cmo - VIO bus accounting structure for CMO entitlement
- *
- * @lock: spinlock for entire structure
- * @balance_q: work queue for balancing system entitlement
- * @device_list: list of CMO-enabled devices requiring entitlement
- * @entitled: total system entitlement in bytes
- * @reserve: pool of memory from which devices reserve entitlement, incl. spare
- * @excess: pool of excess entitlement not needed for device reserves or spare
- * @spare: IO memory for device hotplug functionality
- * @min: minimum necessary for system operation
- * @desired: desired memory for system operation
- * @curr: bytes currently allocated
- * @high: high water mark for IO data usage
- */
-static struct vio_cmo {
-	spinlock_t lock;
-	struct delayed_work balance_q;
-	struct list_head device_list;
-	size_t entitled;
-	struct vio_cmo_pool reserve;
-	struct vio_cmo_pool excess;
-	size_t spare;
-	size_t min;
-	size_t desired;
-	size_t curr;
-	size_t high;
-} vio_cmo;
-
-/**
- * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows
- */
-static int vio_cmo_num_OF_devs(void)
-{
-	struct device_node *node_vroot;
-	int count = 0;
-
-	/*
-	 * Count the number of vdevice entries with an
-	 * ibm,my-dma-window OF property
-	 */
-	node_vroot = of_find_node_by_name(NULL, "vdevice");
-	if (node_vroot) {
-		struct device_node *of_node;
-		struct property *prop;
-
-		for_each_child_of_node(node_vroot, of_node) {
-			prop = of_find_property(of_node, "ibm,my-dma-window",
-			                       NULL);
-			if (prop)
-				count++;
-		}
-	}
-	of_node_put(node_vroot);
-	return count;
-}
-
-/**
- * vio_cmo_alloc - allocate IO memory for CMO-enable devices
- *
- * @viodev: VIO device requesting IO memory
- * @size: size of allocation requested
- *
- * Allocations come from memory reserved for the devices and any excess
- * IO memory available to all devices.  The spare pool used to service
- * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be
- * made available.
- *
- * Return codes:
- *  0 for successful allocation and -ENOMEM for a failure
- */
-static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size)
-{
-	unsigned long flags;
-	size_t reserve_free = 0;
-	size_t excess_free = 0;
-	int ret = -ENOMEM;
-
-	spin_lock_irqsave(&vio_cmo.lock, flags);
-
-	/* Determine the amount of free entitlement available in reserve */
-	if (viodev->cmo.entitled > viodev->cmo.allocated)
-		reserve_free = viodev->cmo.entitled - viodev->cmo.allocated;
-
-	/* If spare is not fulfilled, the excess pool can not be used. */
-	if (vio_cmo.spare >= VIO_CMO_MIN_ENT)
-		excess_free = vio_cmo.excess.free;
-
-	/* The request can be satisfied */
-	if ((reserve_free + excess_free) >= size) {
-		vio_cmo.curr += size;
-		if (vio_cmo.curr > vio_cmo.high)
-			vio_cmo.high = vio_cmo.curr;
-		viodev->cmo.allocated += size;
-		size -= min(reserve_free, size);
-		vio_cmo.excess.free -= size;
-		ret = 0;
-	}
-
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-	return ret;
-}
-
-/**
- * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices
- * @viodev: VIO device freeing IO memory
- * @size: size of deallocation
- *
- * IO memory is freed by the device back to the correct memory pools.
- * The spare pool is replenished first from either memory pool, then
- * the reserve pool is used to reduce device entitlement, the excess
- * pool is used to increase the reserve pool toward the desired entitlement
- * target, and then the remaining memory is returned to the pools.
- *
- */
-static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size)
-{
-	unsigned long flags;
-	size_t spare_needed = 0;
-	size_t excess_freed = 0;
-	size_t reserve_freed = size;
-	size_t tmp;
-	int balance = 0;
-
-	spin_lock_irqsave(&vio_cmo.lock, flags);
-	vio_cmo.curr -= size;
-
-	/* Amount of memory freed from the excess pool */
-	if (viodev->cmo.allocated > viodev->cmo.entitled) {
-		excess_freed = min(reserve_freed, (viodev->cmo.allocated -
-		                                   viodev->cmo.entitled));
-		reserve_freed -= excess_freed;
-	}
-
-	/* Remove allocation from device */
-	viodev->cmo.allocated -= (reserve_freed + excess_freed);
-
-	/* Spare is a subset of the reserve pool, replenish it first. */
-	spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare;
-
-	/*
-	 * Replenish the spare in the reserve pool from the excess pool.
-	 * This moves entitlement into the reserve pool.
-	 */
-	if (spare_needed && excess_freed) {
-		tmp = min(excess_freed, spare_needed);
-		vio_cmo.excess.size -= tmp;
-		vio_cmo.reserve.size += tmp;
-		vio_cmo.spare += tmp;
-		excess_freed -= tmp;
-		spare_needed -= tmp;
-		balance = 1;
-	}
-
-	/*
-	 * Replenish the spare in the reserve pool from the reserve pool.
-	 * This removes entitlement from the device down to VIO_CMO_MIN_ENT,
-	 * if needed, and gives it to the spare pool. The amount of used
-	 * memory in this pool does not change.
-	 */
-	if (spare_needed && reserve_freed) {
-		tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT));
-
-		vio_cmo.spare += tmp;
-		viodev->cmo.entitled -= tmp;
-		reserve_freed -= tmp;
-		spare_needed -= tmp;
-		balance = 1;
-	}
-
-	/*
-	 * Increase the reserve pool until the desired allocation is met.
-	 * Move an allocation freed from the excess pool into the reserve
-	 * pool and schedule a balance operation.
-	 */
-	if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) {
-		tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size));
-
-		vio_cmo.excess.size -= tmp;
-		vio_cmo.reserve.size += tmp;
-		excess_freed -= tmp;
-		balance = 1;
-	}
-
-	/* Return memory from the excess pool to that pool */
-	if (excess_freed)
-		vio_cmo.excess.free += excess_freed;
-
-	if (balance)
-		schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY);
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-}
-
-/**
- * vio_cmo_entitlement_update - Manage system entitlement changes
- *
- * @new_entitlement: new system entitlement to attempt to accommodate
- *
- * Increases in entitlement will be used to fulfill the spare entitlement
- * and the rest is given to the excess pool.  Decreases, if they are
- * possible, come from the excess pool and from unused device entitlement
- *
- * Returns: 0 on success, -ENOMEM when change can not be made
- */
-int vio_cmo_entitlement_update(size_t new_entitlement)
-{
-	struct vio_dev *viodev;
-	struct vio_cmo_dev_entry *dev_ent;
-	unsigned long flags;
-	size_t avail, delta, tmp;
-
-	spin_lock_irqsave(&vio_cmo.lock, flags);
-
-	/* Entitlement increases */
-	if (new_entitlement > vio_cmo.entitled) {
-		delta = new_entitlement - vio_cmo.entitled;
-
-		/* Fulfill spare allocation */
-		if (vio_cmo.spare < VIO_CMO_MIN_ENT) {
-			tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare));
-			vio_cmo.spare += tmp;
-			vio_cmo.reserve.size += tmp;
-			delta -= tmp;
-		}
-
-		/* Remaining new allocation goes to the excess pool */
-		vio_cmo.entitled += delta;
-		vio_cmo.excess.size += delta;
-		vio_cmo.excess.free += delta;
-
-		goto out;
-	}
-
-	/* Entitlement decreases */
-	delta = vio_cmo.entitled - new_entitlement;
-	avail = vio_cmo.excess.free;
-
-	/*
-	 * Need to check how much unused entitlement each device can
-	 * sacrifice to fulfill entitlement change.
-	 */
-	list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
-		if (avail >= delta)
-			break;
-
-		viodev = dev_ent->viodev;
-		if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
-		    (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
-				avail += viodev->cmo.entitled -
-				         max_t(size_t, viodev->cmo.allocated,
-				               VIO_CMO_MIN_ENT);
-	}
-
-	if (delta <= avail) {
-		vio_cmo.entitled -= delta;
-
-		/* Take entitlement from the excess pool first */
-		tmp = min(vio_cmo.excess.free, delta);
-		vio_cmo.excess.size -= tmp;
-		vio_cmo.excess.free -= tmp;
-		delta -= tmp;
-
-		/*
-		 * Remove all but VIO_CMO_MIN_ENT bytes from devices
-		 * until entitlement change is served
-		 */
-		list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
-			if (!delta)
-				break;
-
-			viodev = dev_ent->viodev;
-			tmp = 0;
-			if ((viodev->cmo.entitled > viodev->cmo.allocated) &&
-			    (viodev->cmo.entitled > VIO_CMO_MIN_ENT))
-				tmp = viodev->cmo.entitled -
-				      max_t(size_t, viodev->cmo.allocated,
-				            VIO_CMO_MIN_ENT);
-			viodev->cmo.entitled -= min(tmp, delta);
-			delta -= min(tmp, delta);
-		}
-	} else {
-		spin_unlock_irqrestore(&vio_cmo.lock, flags);
-		return -ENOMEM;
-	}
-
-out:
-	schedule_delayed_work(&vio_cmo.balance_q, 0);
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-	return 0;
-}
-
-/**
- * vio_cmo_balance - Balance entitlement among devices
- *
- * @work: work queue structure for this operation
- *
- * Any system entitlement above the minimum needed for devices, or
- * already allocated to devices, can be distributed to the devices.
- * The list of devices is iterated through to recalculate the desired
- * entitlement level and to determine how much entitlement above the
- * minimum entitlement is allocated to devices.
- *
- * Small chunks of the available entitlement are given to devices until
- * their requirements are fulfilled or there is no entitlement left to give.
- * Upon completion sizes of the reserve and excess pools are calculated.
- *
- * The system minimum entitlement level is also recalculated here.
- * Entitlement will be reserved for devices even after vio_bus_remove to
- * accommodate reloading the driver.  The OF tree is walked to count the
- * number of devices present and this will remove entitlement for devices
- * that have actually left the system after having vio_bus_remove called.
- */
-static void vio_cmo_balance(struct work_struct *work)
-{
-	struct vio_cmo *cmo;
-	struct vio_dev *viodev;
-	struct vio_cmo_dev_entry *dev_ent;
-	unsigned long flags;
-	size_t avail = 0, level, chunk, need;
-	int devcount = 0, fulfilled;
-
-	cmo = container_of(work, struct vio_cmo, balance_q.work);
-
-	spin_lock_irqsave(&vio_cmo.lock, flags);
-
-	/* Calculate minimum entitlement and fulfill spare */
-	cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT;
-	BUG_ON(cmo->min > cmo->entitled);
-	cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min));
-	cmo->min += cmo->spare;
-	cmo->desired = cmo->min;
-
-	/*
-	 * Determine how much entitlement is available and reset device
-	 * entitlements
-	 */
-	avail = cmo->entitled - cmo->spare;
-	list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
-		viodev = dev_ent->viodev;
-		devcount++;
-		viodev->cmo.entitled = VIO_CMO_MIN_ENT;
-		cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT);
-		avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT);
-	}
-
-	/*
-	 * Having provided each device with the minimum entitlement, loop
-	 * over the devices portioning out the remaining entitlement
-	 * until there is nothing left.
-	 */
-	level = VIO_CMO_MIN_ENT;
-	while (avail) {
-		fulfilled = 0;
-		list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
-			viodev = dev_ent->viodev;
-
-			if (viodev->cmo.desired <= level) {
-				fulfilled++;
-				continue;
-			}
-
-			/*
-			 * Give the device up to VIO_CMO_BALANCE_CHUNK
-			 * bytes of entitlement, but do not exceed the
-			 * desired level of entitlement for the device.
-			 */
-			chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK);
-			chunk = min(chunk, (viodev->cmo.desired -
-			                    viodev->cmo.entitled));
-			viodev->cmo.entitled += chunk;
-
-			/*
-			 * If the memory for this entitlement increase was
-			 * already allocated to the device it does not come
-			 * from the available pool being portioned out.
-			 */
-			need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
-			       max(viodev->cmo.allocated, level);
-			avail -= need;
-
-		}
-		if (fulfilled == devcount)
-			break;
-		level += VIO_CMO_BALANCE_CHUNK;
-	}
-
-	/* Calculate new reserve and excess pool sizes */
-	cmo->reserve.size = cmo->min;
-	cmo->excess.free = 0;
-	cmo->excess.size = 0;
-	need = 0;
-	list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
-		viodev = dev_ent->viodev;
-		/* Calculated reserve size above the minimum entitlement */
-		if (viodev->cmo.entitled)
-			cmo->reserve.size += (viodev->cmo.entitled -
-			                      VIO_CMO_MIN_ENT);
-		/* Calculated used excess entitlement */
-		if (viodev->cmo.allocated > viodev->cmo.entitled)
-			need += viodev->cmo.allocated - viodev->cmo.entitled;
-	}
-	cmo->excess.size = cmo->entitled - cmo->reserve.size;
-	cmo->excess.free = cmo->excess.size - need;
-
-	cancel_delayed_work(to_delayed_work(work));
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-}
-
-static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size,
-					  dma_addr_t *dma_handle, gfp_t flag,
-					  unsigned long attrs)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	void *ret;
-
-	if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) {
-		atomic_inc(&viodev->cmo.allocs_failed);
-		return NULL;
-	}
-
-	ret = dma_iommu_ops.alloc(dev, size, dma_handle, flag, attrs);
-	if (unlikely(ret == NULL)) {
-		vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
-		atomic_inc(&viodev->cmo.allocs_failed);
-	}
-
-	return ret;
-}
-
-static void vio_dma_iommu_free_coherent(struct device *dev, size_t size,
-					void *vaddr, dma_addr_t dma_handle,
-					unsigned long attrs)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-
-	dma_iommu_ops.free(dev, size, vaddr, dma_handle, attrs);
-
-	vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE));
-}
-
-static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page,
-                                         unsigned long offset, size_t size,
-                                         enum dma_data_direction direction,
-                                         unsigned long attrs)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	struct iommu_table *tbl;
-	dma_addr_t ret = DMA_ERROR_CODE;
-
-	tbl = get_iommu_table_base(dev);
-	if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)))) {
-		atomic_inc(&viodev->cmo.allocs_failed);
-		return ret;
-	}
-
-	ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs);
-	if (unlikely(dma_mapping_error(dev, ret))) {
-		vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
-		atomic_inc(&viodev->cmo.allocs_failed);
-	}
-
-	return ret;
-}
-
-static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
-				     size_t size,
-				     enum dma_data_direction direction,
-				     unsigned long attrs)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	struct iommu_table *tbl;
-
-	tbl = get_iommu_table_base(dev);
-	dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs);
-
-	vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)));
-}
-
-static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
-                                int nelems, enum dma_data_direction direction,
-                                unsigned long attrs)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	struct iommu_table *tbl;
-	struct scatterlist *sgl;
-	int ret, count;
-	size_t alloc_size = 0;
-
-	tbl = get_iommu_table_base(dev);
-	for_each_sg(sglist, sgl, nelems, count)
-		alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl));
-
-	if (vio_cmo_alloc(viodev, alloc_size)) {
-		atomic_inc(&viodev->cmo.allocs_failed);
-		return 0;
-	}
-
-	ret = dma_iommu_ops.map_sg(dev, sglist, nelems, direction, attrs);
-
-	if (unlikely(!ret)) {
-		vio_cmo_dealloc(viodev, alloc_size);
-		atomic_inc(&viodev->cmo.allocs_failed);
-		return ret;
-	}
-
-	for_each_sg(sglist, sgl, ret, count)
-		alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
-	if (alloc_size)
-		vio_cmo_dealloc(viodev, alloc_size);
-
-	return ret;
-}
-
-static void vio_dma_iommu_unmap_sg(struct device *dev,
-		struct scatterlist *sglist, int nelems,
-		enum dma_data_direction direction,
-		unsigned long attrs)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	struct iommu_table *tbl;
-	struct scatterlist *sgl;
-	size_t alloc_size = 0;
-	int count;
-
-	tbl = get_iommu_table_base(dev);
-	for_each_sg(sglist, sgl, nelems, count)
-		alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl));
-
-	dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs);
-
-	vio_cmo_dealloc(viodev, alloc_size);
-}
-
-static int vio_dma_iommu_dma_supported(struct device *dev, u64 mask)
-{
-        return dma_iommu_ops.dma_supported(dev, mask);
-}
-
-static u64 vio_dma_get_required_mask(struct device *dev)
-{
-        return dma_iommu_ops.get_required_mask(dev);
-}
-
-static struct dma_map_ops vio_dma_mapping_ops = {
-	.alloc             = vio_dma_iommu_alloc_coherent,
-	.free              = vio_dma_iommu_free_coherent,
-	.mmap		   = dma_direct_mmap_coherent,
-	.map_sg            = vio_dma_iommu_map_sg,
-	.unmap_sg          = vio_dma_iommu_unmap_sg,
-	.map_page          = vio_dma_iommu_map_page,
-	.unmap_page        = vio_dma_iommu_unmap_page,
-	.dma_supported     = vio_dma_iommu_dma_supported,
-	.get_required_mask = vio_dma_get_required_mask,
-};
-
-/**
- * vio_cmo_set_dev_desired - Set desired entitlement for a device
- *
- * @viodev: struct vio_dev for device to alter
- * @desired: new desired entitlement level in bytes
- *
- * For use by devices to request a change to their entitlement at runtime or
- * through sysfs.  The desired entitlement level is changed and a balancing
- * of system resources is scheduled to run in the future.
- */
-void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired)
-{
-	unsigned long flags;
-	struct vio_cmo_dev_entry *dev_ent;
-	int found = 0;
-
-	if (!firmware_has_feature(FW_FEATURE_CMO))
-		return;
-
-	spin_lock_irqsave(&vio_cmo.lock, flags);
-	if (desired < VIO_CMO_MIN_ENT)
-		desired = VIO_CMO_MIN_ENT;
-
-	/*
-	 * Changes will not be made for devices not in the device list.
-	 * If it is not in the device list, then no driver is loaded
-	 * for the device and it can not receive entitlement.
-	 */
-	list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
-		if (viodev == dev_ent->viodev) {
-			found = 1;
-			break;
-		}
-	if (!found) {
-		spin_unlock_irqrestore(&vio_cmo.lock, flags);
-		return;
-	}
-
-	/* Increase/decrease in desired device entitlement */
-	if (desired >= viodev->cmo.desired) {
-		/* Just bump the bus and device values prior to a balance*/
-		vio_cmo.desired += desired - viodev->cmo.desired;
-		viodev->cmo.desired = desired;
-	} else {
-		/* Decrease bus and device values for desired entitlement */
-		vio_cmo.desired -= viodev->cmo.desired - desired;
-		viodev->cmo.desired = desired;
-		/*
-		 * If less entitlement is desired than current entitlement, move
-		 * any reserve memory in the change region to the excess pool.
-		 */
-		if (viodev->cmo.entitled > desired) {
-			vio_cmo.reserve.size -= viodev->cmo.entitled - desired;
-			vio_cmo.excess.size += viodev->cmo.entitled - desired;
-			/*
-			 * If entitlement moving from the reserve pool to the
-			 * excess pool is currently unused, add to the excess
-			 * free counter.
-			 */
-			if (viodev->cmo.allocated < viodev->cmo.entitled)
-				vio_cmo.excess.free += viodev->cmo.entitled -
-				                       max(viodev->cmo.allocated, desired);
-			viodev->cmo.entitled = desired;
-		}
-	}
-	schedule_delayed_work(&vio_cmo.balance_q, 0);
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-}
-
-/**
- * vio_cmo_bus_probe - Handle CMO specific bus probe activities
- *
- * @viodev - Pointer to struct vio_dev for device
- *
- * Determine the devices IO memory entitlement needs, attempting
- * to satisfy the system minimum entitlement at first and scheduling
- * a balance operation to take care of the rest at a later time.
- *
- * Returns: 0 on success, -EINVAL when device doesn't support CMO, and
- *          -ENOMEM when entitlement is not available for device or
- *          device entry.
- *
- */
-static int vio_cmo_bus_probe(struct vio_dev *viodev)
-{
-	struct vio_cmo_dev_entry *dev_ent;
-	struct device *dev = &viodev->dev;
-	struct iommu_table *tbl;
-	struct vio_driver *viodrv = to_vio_driver(dev->driver);
-	unsigned long flags;
-	size_t size;
-	bool dma_capable = false;
-
-	tbl = get_iommu_table_base(dev);
-
-	/* A device requires entitlement if it has a DMA window property */
-	switch (viodev->family) {
-	case VDEVICE:
-		if (of_get_property(viodev->dev.of_node,
-					"ibm,my-dma-window", NULL))
-			dma_capable = true;
-		break;
-	case PFO:
-		dma_capable = false;
-		break;
-	default:
-		dev_warn(dev, "unknown device family: %d\n", viodev->family);
-		BUG();
-		break;
-	}
-
-	/* Configure entitlement for the device. */
-	if (dma_capable) {
-		/* Check that the driver is CMO enabled and get desired DMA */
-		if (!viodrv->get_desired_dma) {
-			dev_err(dev, "%s: device driver does not support CMO\n",
-			        __func__);
-			return -EINVAL;
-		}
-
-		viodev->cmo.desired =
-			IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev), tbl);
-		if (viodev->cmo.desired < VIO_CMO_MIN_ENT)
-			viodev->cmo.desired = VIO_CMO_MIN_ENT;
-		size = VIO_CMO_MIN_ENT;
-
-		dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry),
-		                  GFP_KERNEL);
-		if (!dev_ent)
-			return -ENOMEM;
-
-		dev_ent->viodev = viodev;
-		spin_lock_irqsave(&vio_cmo.lock, flags);
-		list_add(&dev_ent->list, &vio_cmo.device_list);
-	} else {
-		viodev->cmo.desired = 0;
-		size = 0;
-		spin_lock_irqsave(&vio_cmo.lock, flags);
-	}
-
-	/*
-	 * If the needs for vio_cmo.min have not changed since they
-	 * were last set, the number of devices in the OF tree has
-	 * been constant and the IO memory for this is already in
-	 * the reserve pool.
-	 */
-	if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) *
-	                    VIO_CMO_MIN_ENT)) {
-		/* Updated desired entitlement if device requires it */
-		if (size)
-			vio_cmo.desired += (viodev->cmo.desired -
-		                        VIO_CMO_MIN_ENT);
-	} else {
-		size_t tmp;
-
-		tmp = vio_cmo.spare + vio_cmo.excess.free;
-		if (tmp < size) {
-			dev_err(dev, "%s: insufficient free "
-			        "entitlement to add device. "
-			        "Need %lu, have %lu\n", __func__,
-				size, (vio_cmo.spare + tmp));
-			spin_unlock_irqrestore(&vio_cmo.lock, flags);
-			return -ENOMEM;
-		}
-
-		/* Use excess pool first to fulfill request */
-		tmp = min(size, vio_cmo.excess.free);
-		vio_cmo.excess.free -= tmp;
-		vio_cmo.excess.size -= tmp;
-		vio_cmo.reserve.size += tmp;
-
-		/* Use spare if excess pool was insufficient */
-		vio_cmo.spare -= size - tmp;
-
-		/* Update bus accounting */
-		vio_cmo.min += size;
-		vio_cmo.desired += viodev->cmo.desired;
-	}
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-	return 0;
-}
-
-/**
- * vio_cmo_bus_remove - Handle CMO specific bus removal activities
- *
- * @viodev - Pointer to struct vio_dev for device
- *
- * Remove the device from the cmo device list.  The minimum entitlement
- * will be reserved for the device as long as it is in the system.  The
- * rest of the entitlement the device had been allocated will be returned
- * to the system.
- */
-static void vio_cmo_bus_remove(struct vio_dev *viodev)
-{
-	struct vio_cmo_dev_entry *dev_ent;
-	unsigned long flags;
-	size_t tmp;
-
-	spin_lock_irqsave(&vio_cmo.lock, flags);
-	if (viodev->cmo.allocated) {
-		dev_err(&viodev->dev, "%s: device had %lu bytes of IO "
-		        "allocated after remove operation.\n",
-		        __func__, viodev->cmo.allocated);
-		BUG();
-	}
-
-	/*
-	 * Remove the device from the device list being maintained for
-	 * CMO enabled devices.
-	 */
-	list_for_each_entry(dev_ent, &vio_cmo.device_list, list)
-		if (viodev == dev_ent->viodev) {
-			list_del(&dev_ent->list);
-			kfree(dev_ent);
-			break;
-		}
-
-	/*
-	 * Devices may not require any entitlement and they do not need
-	 * to be processed.  Otherwise, return the device's entitlement
-	 * back to the pools.
-	 */
-	if (viodev->cmo.entitled) {
-		/*
-		 * This device has not yet left the OF tree, it's
-		 * minimum entitlement remains in vio_cmo.min and
-		 * vio_cmo.desired
-		 */
-		vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT);
-
-		/*
-		 * Save min allocation for device in reserve as long
-		 * as it exists in OF tree as determined by later
-		 * balance operation
-		 */
-		viodev->cmo.entitled -= VIO_CMO_MIN_ENT;
-
-		/* Replenish spare from freed reserve pool */
-		if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) {
-			tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT -
-			                                 vio_cmo.spare));
-			vio_cmo.spare += tmp;
-			viodev->cmo.entitled -= tmp;
-		}
-
-		/* Remaining reserve goes to excess pool */
-		vio_cmo.excess.size += viodev->cmo.entitled;
-		vio_cmo.excess.free += viodev->cmo.entitled;
-		vio_cmo.reserve.size -= viodev->cmo.entitled;
-
-		/*
-		 * Until the device is removed it will keep a
-		 * minimum entitlement; this will guarantee that
-		 * a module unload/load will result in a success.
-		 */
-		viodev->cmo.entitled = VIO_CMO_MIN_ENT;
-		viodev->cmo.desired = VIO_CMO_MIN_ENT;
-		atomic_set(&viodev->cmo.allocs_failed, 0);
-	}
-
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-}
-
-static void vio_cmo_set_dma_ops(struct vio_dev *viodev)
-{
-	set_dma_ops(&viodev->dev, &vio_dma_mapping_ops);
-}
-
-/**
- * vio_cmo_bus_init - CMO entitlement initialization at bus init time
- *
- * Set up the reserve and excess entitlement pools based on available
- * system entitlement and the number of devices in the OF tree that
- * require entitlement in the reserve pool.
- */
-static void vio_cmo_bus_init(void)
-{
-	struct hvcall_mpp_data mpp_data;
-	int err;
-
-	memset(&vio_cmo, 0, sizeof(struct vio_cmo));
-	spin_lock_init(&vio_cmo.lock);
-	INIT_LIST_HEAD(&vio_cmo.device_list);
-	INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance);
-
-	/* Get current system entitlement */
-	err = h_get_mpp(&mpp_data);
-
-	/*
-	 * On failure, continue with entitlement set to 0, will panic()
-	 * later when spare is reserved.
-	 */
-	if (err != H_SUCCESS) {
-		printk(KERN_ERR "%s: unable to determine system IO "\
-		       "entitlement. (%d)\n", __func__, err);
-		vio_cmo.entitled = 0;
-	} else {
-		vio_cmo.entitled = mpp_data.entitled_mem;
-	}
-
-	/* Set reservation and check against entitlement */
-	vio_cmo.spare = VIO_CMO_MIN_ENT;
-	vio_cmo.reserve.size = vio_cmo.spare;
-	vio_cmo.reserve.size += (vio_cmo_num_OF_devs() *
-	                         VIO_CMO_MIN_ENT);
-	if (vio_cmo.reserve.size > vio_cmo.entitled) {
-		printk(KERN_ERR "%s: insufficient system entitlement\n",
-		       __func__);
-		panic("%s: Insufficient system entitlement", __func__);
-	}
-
-	/* Set the remaining accounting variables */
-	vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size;
-	vio_cmo.excess.free = vio_cmo.excess.size;
-	vio_cmo.min = vio_cmo.reserve.size;
-	vio_cmo.desired = vio_cmo.reserve.size;
-}
-
-/* sysfs device functions and data structures for CMO */
-
-#define viodev_cmo_rd_attr(name)                                        \
-static ssize_t viodev_cmo_##name##_show(struct device *dev,             \
-                                        struct device_attribute *attr,  \
-                                         char *buf)                     \
-{                                                                       \
-	return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name);        \
-}
-
-static ssize_t viodev_cmo_allocs_failed_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed));
-}
-
-static ssize_t viodev_cmo_allocs_failed_reset(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	atomic_set(&viodev->cmo.allocs_failed, 0);
-	return count;
-}
-
-static ssize_t viodev_cmo_desired_set(struct device *dev,
-		struct device_attribute *attr, const char *buf, size_t count)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	size_t new_desired;
-	int ret;
-
-	ret = kstrtoul(buf, 10, &new_desired);
-	if (ret)
-		return ret;
-
-	vio_cmo_set_dev_desired(viodev, new_desired);
-	return count;
-}
-
-viodev_cmo_rd_attr(desired);
-viodev_cmo_rd_attr(entitled);
-viodev_cmo_rd_attr(allocated);
-
-static ssize_t name_show(struct device *, struct device_attribute *, char *);
-static ssize_t devspec_show(struct device *, struct device_attribute *, char *);
-static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
-			     char *buf);
-static struct device_attribute vio_cmo_dev_attrs[] = {
-	__ATTR_RO(name),
-	__ATTR_RO(devspec),
-	__ATTR_RO(modalias),
-	__ATTR(cmo_desired,       S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
-	       viodev_cmo_desired_show, viodev_cmo_desired_set),
-	__ATTR(cmo_entitled,      S_IRUGO, viodev_cmo_entitled_show,      NULL),
-	__ATTR(cmo_allocated,     S_IRUGO, viodev_cmo_allocated_show,     NULL),
-	__ATTR(cmo_allocs_failed, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
-	       viodev_cmo_allocs_failed_show, viodev_cmo_allocs_failed_reset),
-	__ATTR_NULL
-};
-
-/* sysfs bus functions and data structures for CMO */
-
-#define viobus_cmo_rd_attr(name)                                        \
-static ssize_t cmo_##name##_show(struct bus_type *bt, char *buf)        \
-{                                                                       \
-	return sprintf(buf, "%lu\n", vio_cmo.name);                     \
-}                                                                       \
-static BUS_ATTR_RO(cmo_##name)
-
-#define viobus_cmo_pool_rd_attr(name, var)                              \
-static ssize_t                                                          \
-cmo_##name##_##var##_show(struct bus_type *bt, char *buf)               \
-{                                                                       \
-	return sprintf(buf, "%lu\n", vio_cmo.name.var);                 \
-}                                                                       \
-static BUS_ATTR_RO(cmo_##name##_##var)
-
-viobus_cmo_rd_attr(entitled);
-viobus_cmo_rd_attr(spare);
-viobus_cmo_rd_attr(min);
-viobus_cmo_rd_attr(desired);
-viobus_cmo_rd_attr(curr);
-viobus_cmo_pool_rd_attr(reserve, size);
-viobus_cmo_pool_rd_attr(excess, size);
-viobus_cmo_pool_rd_attr(excess, free);
-
-static ssize_t cmo_high_show(struct bus_type *bt, char *buf)
-{
-	return sprintf(buf, "%lu\n", vio_cmo.high);
-}
-
-static ssize_t cmo_high_store(struct bus_type *bt, const char *buf,
-			      size_t count)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&vio_cmo.lock, flags);
-	vio_cmo.high = vio_cmo.curr;
-	spin_unlock_irqrestore(&vio_cmo.lock, flags);
-
-	return count;
-}
-static BUS_ATTR_RW(cmo_high);
-
-static struct attribute *vio_bus_attrs[] = {
-	&bus_attr_cmo_entitled.attr,
-	&bus_attr_cmo_spare.attr,
-	&bus_attr_cmo_min.attr,
-	&bus_attr_cmo_desired.attr,
-	&bus_attr_cmo_curr.attr,
-	&bus_attr_cmo_high.attr,
-	&bus_attr_cmo_reserve_size.attr,
-	&bus_attr_cmo_excess_size.attr,
-	&bus_attr_cmo_excess_free.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(vio_bus);
-
-static void vio_cmo_sysfs_init(void)
-{
-	vio_bus_type.dev_attrs = vio_cmo_dev_attrs;
-	vio_bus_type.bus_groups = vio_bus_groups;
-}
-#else /* CONFIG_PPC_SMLPAR */
-int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; }
-void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {}
-static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; }
-static void vio_cmo_bus_remove(struct vio_dev *viodev) {}
-static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {}
-static void vio_cmo_bus_init(void) {}
-static void vio_cmo_sysfs_init(void) { }
-#endif /* CONFIG_PPC_SMLPAR */
-EXPORT_SYMBOL(vio_cmo_entitlement_update);
-EXPORT_SYMBOL(vio_cmo_set_dev_desired);
-
-
-/*
- * Platform Facilities Option (PFO) support
- */
-
-/**
- * vio_h_cop_sync - Perform a synchronous PFO co-processor operation
- *
- * @vdev - Pointer to a struct vio_dev for device
- * @op - Pointer to a struct vio_pfo_op for the operation parameters
- *
- * Calls the hypervisor to synchronously perform the PFO operation
- * described in @op.  In the case of a busy response from the hypervisor,
- * the operation will be re-submitted indefinitely unless a non-zero timeout
- * is specified or an error occurs. The timeout places a limit on when to
- * stop re-submitting a operation, the total time can be exceeded if an
- * operation is in progress.
- *
- * If op->hcall_ret is not NULL, this will be set to the return from the
- * last h_cop_op call or it will be 0 if an error not involving the h_call
- * was encountered.
- *
- * Returns:
- *	0 on success,
- *	-EINVAL if the h_call fails due to an invalid parameter,
- *	-E2BIG if the h_call can not be performed synchronously,
- *	-EBUSY if a timeout is specified and has elapsed,
- *	-EACCES if the memory area for data/status has been rescinded, or
- *	-EPERM if a hardware fault has been indicated
- */
-int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op)
-{
-	struct device *dev = &vdev->dev;
-	unsigned long deadline = 0;
-	long hret = 0;
-	int ret = 0;
-
-	if (op->timeout)
-		deadline = jiffies + msecs_to_jiffies(op->timeout);
-
-	while (true) {
-		hret = plpar_hcall_norets(H_COP, op->flags,
-				vdev->resource_id,
-				op->in, op->inlen, op->out,
-				op->outlen, op->csbcpb);
-
-		if (hret == H_SUCCESS ||
-		    (hret != H_NOT_ENOUGH_RESOURCES &&
-		     hret != H_BUSY && hret != H_RESOURCE) ||
-		    (op->timeout && time_after(deadline, jiffies)))
-			break;
-
-		dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret);
-	}
-
-	switch (hret) {
-	case H_SUCCESS:
-		ret = 0;
-		break;
-	case H_OP_MODE:
-	case H_TOO_BIG:
-		ret = -E2BIG;
-		break;
-	case H_RESCINDED:
-		ret = -EACCES;
-		break;
-	case H_HARDWARE:
-		ret = -EPERM;
-		break;
-	case H_NOT_ENOUGH_RESOURCES:
-	case H_RESOURCE:
-	case H_BUSY:
-		ret = -EBUSY;
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	if (ret)
-		dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n",
-				__func__, ret, hret);
-
-	op->hcall_err = hret;
-	return ret;
-}
-EXPORT_SYMBOL(vio_h_cop_sync);
-
-static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
-{
-	const __be32 *dma_window;
-	struct iommu_table *tbl;
-	unsigned long offset, size;
-
-	dma_window = of_get_property(dev->dev.of_node,
-				  "ibm,my-dma-window", NULL);
-	if (!dma_window)
-		return NULL;
-
-	tbl = kzalloc(sizeof(*tbl), GFP_KERNEL);
-	if (tbl == NULL)
-		return NULL;
-
-	of_parse_dma_window(dev->dev.of_node, dma_window,
-			    &tbl->it_index, &offset, &size);
-
-	/* TCE table size - measured in tce entries */
-	tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K;
-	tbl->it_size = size >> tbl->it_page_shift;
-	/* offset for VIO should always be 0 */
-	tbl->it_offset = offset >> tbl->it_page_shift;
-	tbl->it_busno = 0;
-	tbl->it_type = TCE_VB;
-	tbl->it_blocksize = 16;
-
-	if (firmware_has_feature(FW_FEATURE_LPAR))
-		tbl->it_ops = &iommu_table_lpar_multi_ops;
-	else
-		tbl->it_ops = &iommu_table_pseries_ops;
-
-	return iommu_init_table(tbl, -1);
-}
-
-/**
- * vio_match_device: - Tell if a VIO device has a matching
- *			VIO device id structure.
- * @ids:	array of VIO device id structures to search in
- * @dev:	the VIO device structure to match against
- *
- * Used by a driver to check whether a VIO device present in the
- * system is in its list of supported devices. Returns the matching
- * vio_device_id structure or NULL if there is no match.
- */
-static const struct vio_device_id *vio_match_device(
-		const struct vio_device_id *ids, const struct vio_dev *dev)
-{
-	while (ids->type[0] != '\0') {
-		if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
-		    of_device_is_compatible(dev->dev.of_node,
-					 ids->compat))
-			return ids;
-		ids++;
-	}
-	return NULL;
-}
-
-/*
- * Convert from struct device to struct vio_dev and pass to driver.
- * dev->driver has already been set by generic code because vio_bus_match
- * succeeded.
- */
-static int vio_bus_probe(struct device *dev)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	struct vio_driver *viodrv = to_vio_driver(dev->driver);
-	const struct vio_device_id *id;
-	int error = -ENODEV;
-
-	if (!viodrv->probe)
-		return error;
-
-	id = vio_match_device(viodrv->id_table, viodev);
-	if (id) {
-		memset(&viodev->cmo, 0, sizeof(viodev->cmo));
-		if (firmware_has_feature(FW_FEATURE_CMO)) {
-			error = vio_cmo_bus_probe(viodev);
-			if (error)
-				return error;
-		}
-		error = viodrv->probe(viodev, id);
-		if (error && firmware_has_feature(FW_FEATURE_CMO))
-			vio_cmo_bus_remove(viodev);
-	}
-
-	return error;
-}
-
-/* convert from struct device to struct vio_dev and pass to driver. */
-static int vio_bus_remove(struct device *dev)
-{
-	struct vio_dev *viodev = to_vio_dev(dev);
-	struct vio_driver *viodrv = to_vio_driver(dev->driver);
-	struct device *devptr;
-	int ret = 1;
-
-	/*
-	 * Hold a reference to the device after the remove function is called
-	 * to allow for CMO accounting cleanup for the device.
-	 */
-	devptr = get_device(dev);
-
-	if (viodrv->remove)
-		ret = viodrv->remove(viodev);
-
-	if (!ret && firmware_has_feature(FW_FEATURE_CMO))
-		vio_cmo_bus_remove(viodev);
-
-	put_device(devptr);
-	return ret;
-}
-
-/**
- * vio_register_driver: - Register a new vio driver
- * @viodrv:	The vio_driver structure to be registered.
- */
-int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
-			  const char *mod_name)
-{
-	pr_debug("%s: driver %s registering\n", __func__, viodrv->name);
-
-	/* fill in 'struct driver' fields */
-	viodrv->driver.name = viodrv->name;
-	viodrv->driver.pm = viodrv->pm;
-	viodrv->driver.bus = &vio_bus_type;
-	viodrv->driver.owner = owner;
-	viodrv->driver.mod_name = mod_name;
-
-	return driver_register(&viodrv->driver);
-}
-EXPORT_SYMBOL(__vio_register_driver);
-
-/**
- * vio_unregister_driver - Remove registration of vio driver.
- * @viodrv:	The vio_driver struct to be removed form registration
- */
-void vio_unregister_driver(struct vio_driver *viodrv)
-{
-	driver_unregister(&viodrv->driver);
-}
-EXPORT_SYMBOL(vio_unregister_driver);
-
-/* vio_dev refcount hit 0 */
-static void vio_dev_release(struct device *dev)
-{
-	struct iommu_table *tbl = get_iommu_table_base(dev);
-
-	if (tbl)
-		iommu_free_table(tbl, of_node_full_name(dev->of_node));
-	of_node_put(dev->of_node);
-	kfree(to_vio_dev(dev));
-}
-
-/**
- * vio_register_device_node: - Register a new vio device.
- * @of_node:	The OF node for this device.
- *
- * Creates and initializes a vio_dev structure from the data in
- * of_node and adds it to the list of virtual devices.
- * Returns a pointer to the created vio_dev or NULL if node has
- * NULL device_type or compatible fields.
- */
-struct vio_dev *vio_register_device_node(struct device_node *of_node)
-{
-	struct vio_dev *viodev;
-	struct device_node *parent_node;
-	const __be32 *prop;
-	enum vio_dev_family family;
-	const char *of_node_name = of_node->name ? of_node->name : "<unknown>";
-
-	/*
-	 * Determine if this node is a under the /vdevice node or under the
-	 * /ibm,platform-facilities node.  This decides the device's family.
-	 */
-	parent_node = of_get_parent(of_node);
-	if (parent_node) {
-		if (!strcmp(parent_node->full_name, "/ibm,platform-facilities"))
-			family = PFO;
-		else if (!strcmp(parent_node->full_name, "/vdevice"))
-			family = VDEVICE;
-		else {
-			pr_warn("%s: parent(%s) of %s not recognized.\n",
-					__func__,
-					parent_node->full_name,
-					of_node_name);
-			of_node_put(parent_node);
-			return NULL;
-		}
-		of_node_put(parent_node);
-	} else {
-		pr_warn("%s: could not determine the parent of node %s.\n",
-				__func__, of_node_name);
-		return NULL;
-	}
-
-	if (family == PFO) {
-		if (of_get_property(of_node, "interrupt-controller", NULL)) {
-			pr_debug("%s: Skipping the interrupt controller %s.\n",
-					__func__, of_node_name);
-			return NULL;
-		}
-	}
-
-	/* allocate a vio_dev for this node */
-	viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
-	if (viodev == NULL) {
-		pr_warn("%s: allocation failure for VIO device.\n", __func__);
-		return NULL;
-	}
-
-	/* we need the 'device_type' property, in order to match with drivers */
-	viodev->family = family;
-	if (viodev->family == VDEVICE) {
-		unsigned int unit_address;
-
-		if (of_node->type != NULL)
-			viodev->type = of_node->type;
-		else {
-			pr_warn("%s: node %s is missing the 'device_type' "
-					"property.\n", __func__, of_node_name);
-			goto out;
-		}
-
-		prop = of_get_property(of_node, "reg", NULL);
-		if (prop == NULL) {
-			pr_warn("%s: node %s missing 'reg'\n",
-					__func__, of_node_name);
-			goto out;
-		}
-		unit_address = of_read_number(prop, 1);
-		dev_set_name(&viodev->dev, "%x", unit_address);
-		viodev->irq = irq_of_parse_and_map(of_node, 0);
-		viodev->unit_address = unit_address;
-	} else {
-		/* PFO devices need their resource_id for submitting COP_OPs
-		 * This is an optional field for devices, but is required when
-		 * performing synchronous ops */
-		prop = of_get_property(of_node, "ibm,resource-id", NULL);
-		if (prop != NULL)
-			viodev->resource_id = of_read_number(prop, 1);
-
-		dev_set_name(&viodev->dev, "%s", of_node_name);
-		viodev->type = of_node_name;
-		viodev->irq = 0;
-	}
-
-	viodev->name = of_node->name;
-	viodev->dev.of_node = of_node_get(of_node);
-
-	set_dev_node(&viodev->dev, of_node_to_nid(of_node));
-
-	/* init generic 'struct device' fields: */
-	viodev->dev.parent = &vio_bus_device.dev;
-	viodev->dev.bus = &vio_bus_type;
-	viodev->dev.release = vio_dev_release;
-
-	if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) {
-		if (firmware_has_feature(FW_FEATURE_CMO))
-			vio_cmo_set_dma_ops(viodev);
-		else
-			set_dma_ops(&viodev->dev, &dma_iommu_ops);
-
-		set_iommu_table_base(&viodev->dev,
-				     vio_build_iommu_table(viodev));
-
-		/* needed to ensure proper operation of coherent allocations
-		 * later, in case driver doesn't set it explicitly */
-		viodev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
-		viodev->dev.dma_mask = &viodev->dev.coherent_dma_mask;
-	}
-
-	/* register with generic device framework */
-	if (device_register(&viodev->dev)) {
-		printk(KERN_ERR "%s: failed to register device %s\n",
-				__func__, dev_name(&viodev->dev));
-		put_device(&viodev->dev);
-		return NULL;
-	}
-
-	return viodev;
-
-out:	/* Use this exit point for any return prior to device_register */
-	kfree(viodev);
-
-	return NULL;
-}
-EXPORT_SYMBOL(vio_register_device_node);
-
-/*
- * vio_bus_scan_for_devices - Scan OF and register each child device
- * @root_name - OF node name for the root of the subtree to search.
- *		This must be non-NULL
- *
- * Starting from the root node provide, register the device node for
- * each child beneath the root.
- */
-static void vio_bus_scan_register_devices(char *root_name)
-{
-	struct device_node *node_root, *node_child;
-
-	if (!root_name)
-		return;
-
-	node_root = of_find_node_by_name(NULL, root_name);
-	if (node_root) {
-
-		/*
-		 * Create struct vio_devices for each virtual device in
-		 * the device tree. Drivers will associate with them later.
-		 */
-		node_child = of_get_next_child(node_root, NULL);
-		while (node_child) {
-			vio_register_device_node(node_child);
-			node_child = of_get_next_child(node_root, node_child);
-		}
-		of_node_put(node_root);
-	}
-}
-
-/**
- * vio_bus_init: - Initialize the virtual IO bus
- */
-static int __init vio_bus_init(void)
-{
-	int err;
-
-	if (firmware_has_feature(FW_FEATURE_CMO))
-		vio_cmo_sysfs_init();
-
-	err = bus_register(&vio_bus_type);
-	if (err) {
-		printk(KERN_ERR "failed to register VIO bus\n");
-		return err;
-	}
-
-	/*
-	 * The fake parent of all vio devices, just to give us
-	 * a nice directory
-	 */
-	err = device_register(&vio_bus_device.dev);
-	if (err) {
-		printk(KERN_WARNING "%s: device_register returned %i\n",
-				__func__, err);
-		return err;
-	}
-
-	if (firmware_has_feature(FW_FEATURE_CMO))
-		vio_cmo_bus_init();
-
-	return 0;
-}
-postcore_initcall(vio_bus_init);
-
-static int __init vio_device_init(void)
-{
-	vio_bus_scan_register_devices("vdevice");
-	vio_bus_scan_register_devices("ibm,platform-facilities");
-
-	return 0;
-}
-device_initcall(vio_device_init);
-
-static ssize_t name_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
-}
-
-static ssize_t devspec_show(struct device *dev,
-		struct device_attribute *attr, char *buf)
-{
-	struct device_node *of_node = dev->of_node;
-
-	return sprintf(buf, "%s\n", of_node_full_name(of_node));
-}
-
-static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
-			     char *buf)
-{
-	const struct vio_dev *vio_dev = to_vio_dev(dev);
-	struct device_node *dn;
-	const char *cp;
-
-	dn = dev->of_node;
-	if (!dn) {
-		strcpy(buf, "\n");
-		return strlen(buf);
-	}
-	cp = of_get_property(dn, "compatible", NULL);
-	if (!cp) {
-		strcpy(buf, "\n");
-		return strlen(buf);
-	}
-
-	return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
-}
-
-static struct device_attribute vio_dev_attrs[] = {
-	__ATTR_RO(name),
-	__ATTR_RO(devspec),
-	__ATTR_RO(modalias),
-	__ATTR_NULL
-};
-
-void vio_unregister_device(struct vio_dev *viodev)
-{
-	device_unregister(&viodev->dev);
-}
-EXPORT_SYMBOL(vio_unregister_device);
-
-static int vio_bus_match(struct device *dev, struct device_driver *drv)
-{
-	const struct vio_dev *vio_dev = to_vio_dev(dev);
-	struct vio_driver *vio_drv = to_vio_driver(drv);
-	const struct vio_device_id *ids = vio_drv->id_table;
-
-	return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
-}
-
-static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
-{
-	const struct vio_dev *vio_dev = to_vio_dev(dev);
-	struct device_node *dn;
-	const char *cp;
-
-	dn = dev->of_node;
-	if (!dn)
-		return -ENODEV;
-	cp = of_get_property(dn, "compatible", NULL);
-	if (!cp)
-		return -ENODEV;
-
-	add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
-	return 0;
-}
-
-struct bus_type vio_bus_type = {
-	.name = "vio",
-	.dev_attrs = vio_dev_attrs,
-	.uevent = vio_hotplug,
-	.match = vio_bus_match,
-	.probe = vio_bus_probe,
-	.remove = vio_bus_remove,
-};
-
-/**
- * vio_get_attribute: - get attribute for virtual device
- * @vdev:	The vio device to get property.
- * @which:	The property/attribute to be extracted.
- * @length:	Pointer to length of returned data size (unused if NULL).
- *
- * Calls prom.c's of_get_property() to return the value of the
- * attribute specified by @which
-*/
-const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
-{
-	return of_get_property(vdev->dev.of_node, which, length);
-}
-EXPORT_SYMBOL(vio_get_attribute);
-
-#ifdef CONFIG_PPC_PSERIES
-/* vio_find_name() - internal because only vio.c knows how we formatted the
- * kobject name
- */
-static struct vio_dev *vio_find_name(const char *name)
-{
-	struct device *found;
-
-	found = bus_find_device_by_name(&vio_bus_type, NULL, name);
-	if (!found)
-		return NULL;
-
-	return to_vio_dev(found);
-}
-
-/**
- * vio_find_node - find an already-registered vio_dev
- * @vnode: device_node of the virtual device we're looking for
- *
- * Takes a reference to the embedded struct device which needs to be dropped
- * after use.
- */
-struct vio_dev *vio_find_node(struct device_node *vnode)
-{
-	char kobj_name[20];
-	struct device_node *vnode_parent;
-	const char *dev_type;
-
-	vnode_parent = of_get_parent(vnode);
-	if (!vnode_parent)
-		return NULL;
-
-	dev_type = of_get_property(vnode_parent, "device_type", NULL);
-	of_node_put(vnode_parent);
-	if (!dev_type)
-		return NULL;
-
-	/* construct the kobject name from the device node */
-	if (!strcmp(dev_type, "vdevice")) {
-		const __be32 *prop;
-		
-		prop = of_get_property(vnode, "reg", NULL);
-		if (!prop)
-			return NULL;
-		snprintf(kobj_name, sizeof(kobj_name), "%x",
-			 (uint32_t)of_read_number(prop, 1));
-	} else if (!strcmp(dev_type, "ibm,platform-facilities"))
-		snprintf(kobj_name, sizeof(kobj_name), "%s", vnode->name);
-	else
-		return NULL;
-
-	return vio_find_name(kobj_name);
-}
-EXPORT_SYMBOL(vio_find_node);
-
-int vio_enable_interrupts(struct vio_dev *dev)
-{
-	int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
-	if (rc != H_SUCCESS)
-		printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
-	return rc;
-}
-EXPORT_SYMBOL(vio_enable_interrupts);
-
-int vio_disable_interrupts(struct vio_dev *dev)
-{
-	int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
-	if (rc != H_SUCCESS)
-		printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
-	return rc;
-}
-EXPORT_SYMBOL(vio_disable_interrupts);
-#endif /* CONFIG_PPC_PSERIES */