linux/arch/powerpc/kernel/vio.c
Jean Delvare bf6aede712 workqueue: add to_delayed_work() helper function
It is a fairly common operation to have a pointer to a work and to need a
pointer to the delayed work it is contained in.  In particular, all
delayed works which want to rearm themselves will have to do that.  So it
would seem fair to offer a helper function for this operation.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-02 19:04:50 -07:00

1433 lines
42 KiB
C

/*
* 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/types.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/module.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/abs_addr.h>
#include <asm/page.h>
#include <asm/hvcall.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call_xm.h>
#include <asm/iseries/iommu.h>
static struct bus_type vio_bus_type;
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
*/
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 = min(spare_needed, min(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)
{
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_coherent(dev, size, dma_handle, flag);
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)
{
struct vio_dev *viodev = to_vio_dev(dev);
dma_iommu_ops.free_coherent(dev, size, vaddr, dma_handle);
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,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
dma_addr_t ret = DMA_ERROR_CODE;
if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE))) {
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));
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,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs);
vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE));
}
static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
struct scatterlist *sgl;
int ret, count = 0;
size_t alloc_size = 0;
for (sgl = sglist; count < nelems; count++, sgl++)
alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE);
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 (sgl = sglist, count = 0; count < ret; count++, sgl++)
alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE);
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,
struct dma_attrs *attrs)
{
struct vio_dev *viodev = to_vio_dev(dev);
struct scatterlist *sgl;
size_t alloc_size = 0;
int count = 0;
for (sgl = sglist; count < nelems; count++, sgl++)
alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE);
dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs);
vio_cmo_dealloc(viodev, alloc_size);
}
struct dma_mapping_ops vio_dma_mapping_ops = {
.alloc_coherent = vio_dma_iommu_alloc_coherent,
.free_coherent = vio_dma_iommu_free_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,
};
/**
* vio_cmo_set_dev_desired - Set desired entitlement for a device
*
* @viodev: struct vio_dev for device to alter
* @new_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)
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 vio_driver *viodrv = to_vio_driver(dev->driver);
unsigned long flags;
size_t size;
/*
* Check to see that device has a DMA window and configure
* entitlement for the device.
*/
if (of_get_property(viodev->dev.archdata.of_node,
"ibm,my-dma-window", NULL)) {
/* 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));
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)
{
vio_dma_mapping_ops.dma_supported = dma_iommu_ops.dma_supported;
viodev->dev.archdata.dma_ops = &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 = strict_strtoul(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 struct device_attribute vio_cmo_dev_attrs[] = {
__ATTR_RO(name),
__ATTR_RO(devspec),
__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 \
viobus_cmo_##name##_show(struct bus_type *bt, char *buf) \
{ \
return sprintf(buf, "%lu\n", vio_cmo.name); \
}
#define viobus_cmo_pool_rd_attr(name, var) \
static ssize_t \
viobus_cmo_##name##_pool_show_##var(struct bus_type *bt, char *buf) \
{ \
return sprintf(buf, "%lu\n", vio_cmo.name.var); \
}
static ssize_t viobus_cmo_high_reset(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;
}
viobus_cmo_rd_attr(entitled);
viobus_cmo_pool_rd_attr(reserve, size);
viobus_cmo_pool_rd_attr(excess, size);
viobus_cmo_pool_rd_attr(excess, free);
viobus_cmo_rd_attr(spare);
viobus_cmo_rd_attr(min);
viobus_cmo_rd_attr(desired);
viobus_cmo_rd_attr(curr);
viobus_cmo_rd_attr(high);
static struct bus_attribute vio_cmo_bus_attrs[] = {
__ATTR(cmo_entitled, S_IRUGO, viobus_cmo_entitled_show, NULL),
__ATTR(cmo_reserve_size, S_IRUGO, viobus_cmo_reserve_pool_show_size, NULL),
__ATTR(cmo_excess_size, S_IRUGO, viobus_cmo_excess_pool_show_size, NULL),
__ATTR(cmo_excess_free, S_IRUGO, viobus_cmo_excess_pool_show_free, NULL),
__ATTR(cmo_spare, S_IRUGO, viobus_cmo_spare_show, NULL),
__ATTR(cmo_min, S_IRUGO, viobus_cmo_min_show, NULL),
__ATTR(cmo_desired, S_IRUGO, viobus_cmo_desired_show, NULL),
__ATTR(cmo_curr, S_IRUGO, viobus_cmo_curr_show, NULL),
__ATTR(cmo_high, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH,
viobus_cmo_high_show, viobus_cmo_high_reset),
__ATTR_NULL
};
static void vio_cmo_sysfs_init(void)
{
vio_bus_type.dev_attrs = vio_cmo_dev_attrs;
vio_bus_type.bus_attrs = vio_cmo_bus_attrs;
}
#else /* CONFIG_PPC_SMLPAR */
/* Dummy functions for iSeries platform */
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);
static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
{
const unsigned char *dma_window;
struct iommu_table *tbl;
unsigned long offset, size;
if (firmware_has_feature(FW_FEATURE_ISERIES))
return vio_build_iommu_table_iseries(dev);
dma_window = of_get_property(dev->dev.archdata.of_node,
"ibm,my-dma-window", NULL);
if (!dma_window)
return NULL;
tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
of_parse_dma_window(dev->dev.archdata.of_node, dma_window,
&tbl->it_index, &offset, &size);
/* TCE table size - measured in tce entries */
tbl->it_size = size >> IOMMU_PAGE_SHIFT;
/* offset for VIO should always be 0 */
tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
tbl->it_busno = 0;
tbl->it_type = TCE_VB;
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.archdata.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
* @drv: The vio_driver structure to be registered.
*/
int vio_register_driver(struct vio_driver *viodrv)
{
printk(KERN_DEBUG "%s: driver %s registering\n", __func__,
viodrv->driver.name);
/* fill in 'struct driver' fields */
viodrv->driver.bus = &vio_bus_type;
return driver_register(&viodrv->driver);
}
EXPORT_SYMBOL(vio_register_driver);
/**
* vio_unregister_driver - Remove registration of vio driver.
* @driver: 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 __devinit vio_dev_release(struct device *dev)
{
/* XXX should free TCE table */
of_node_put(dev->archdata.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;
const unsigned int *unit_address;
/* we need the 'device_type' property, in order to match with drivers */
if (of_node->type == NULL) {
printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
__func__,
of_node->name ? of_node->name : "<unknown>");
return NULL;
}
unit_address = of_get_property(of_node, "reg", NULL);
if (unit_address == NULL) {
printk(KERN_WARNING "%s: node %s missing 'reg'\n",
__func__,
of_node->name ? of_node->name : "<unknown>");
return NULL;
}
/* allocate a vio_dev for this node */
viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
if (viodev == NULL)
return NULL;
viodev->irq = irq_of_parse_and_map(of_node, 0);
dev_set_name(&viodev->dev, "%x", *unit_address);
viodev->name = of_node->name;
viodev->type = of_node->type;
viodev->unit_address = *unit_address;
if (firmware_has_feature(FW_FEATURE_ISERIES)) {
unit_address = of_get_property(of_node,
"linux,unit_address", NULL);
if (unit_address != NULL)
viodev->unit_address = *unit_address;
}
viodev->dev.archdata.of_node = of_node_get(of_node);
if (firmware_has_feature(FW_FEATURE_CMO))
vio_cmo_set_dma_ops(viodev);
else
viodev->dev.archdata.dma_ops = &dma_iommu_ops;
viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
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;
/* 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));
/* XXX free TCE table */
kfree(viodev);
return NULL;
}
return viodev;
}
EXPORT_SYMBOL(vio_register_device_node);
/**
* vio_bus_init: - Initialize the virtual IO bus
*/
static int __init vio_bus_init(void)
{
int err;
struct device_node *node_vroot;
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();
node_vroot = of_find_node_by_name(NULL, "vdevice");
if (node_vroot) {
struct device_node *of_node;
/*
* Create struct vio_devices for each virtual device in
* the device tree. Drivers will associate with them later.
*/
for (of_node = node_vroot->child; of_node != NULL;
of_node = of_node->sibling)
vio_register_device_node(of_node);
of_node_put(node_vroot);
}
return 0;
}
__initcall(vio_bus_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->archdata.of_node;
return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
}
static struct device_attribute vio_dev_attrs[] = {
__ATTR_RO(name),
__ATTR_RO(devspec),
__ATTR_NULL
};
void __devinit 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->archdata.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;
}
static 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.archdata.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
*/
struct vio_dev *vio_find_node(struct device_node *vnode)
{
const uint32_t *unit_address;
char kobj_name[20];
/* construct the kobject name from the device node */
unit_address = of_get_property(vnode, "reg", NULL);
if (!unit_address)
return NULL;
snprintf(kobj_name, sizeof(kobj_name), "%x", *unit_address);
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 */