From 139ac5afe30bcad3e0a8064a2fac608f015aa166 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Tue, 15 Nov 2016 14:47:42 +1100 Subject: powerpc/pseries: Move vio.c into platforms pseries vio.c is pseries only code, so move it in there. Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/Makefile | 1 - arch/powerpc/kernel/vio.c | 1705 ------------------------------- arch/powerpc/platforms/Kconfig | 5 - arch/powerpc/platforms/pseries/Kconfig | 5 + arch/powerpc/platforms/pseries/Makefile | 1 + arch/powerpc/platforms/pseries/vio.c | 1705 +++++++++++++++++++++++++++++++ 6 files changed, 1711 insertions(+), 1711 deletions(-) delete mode 100644 arch/powerpc/kernel/vio.c create mode 100644 arch/powerpc/platforms/pseries/vio.c 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 - * Stephen Rothwell - * Robert Jennings - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include - -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 : ""; - - /* - * 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 */ diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig index fbdae8377b71..eae86c35e4c6 100644 --- a/arch/powerpc/platforms/Kconfig +++ b/arch/powerpc/platforms/Kconfig @@ -168,11 +168,6 @@ config MPIC_BROKEN_REGREAD well, but enabling it uses about 8KB of memory to keep copies of the register contents in software. -config IBMVIO - depends on PPC_PSERIES - bool - default y - config IBMEBUS depends on PPC_PSERIES bool "Support for GX bus based adapters" diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index bec90fb30425..f7d78b81951d 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -127,3 +127,8 @@ config HV_PERF_CTRS systems. 24x7 is available on Power 8 systems. If unsure, select Y. + +config IBMVIO + depends on PPC_PSERIES + bool + default y diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index fedc2ccf029d..85ba00233fb0 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_CMM) += cmm.o obj-$(CONFIG_DTL) += dtl.o obj-$(CONFIG_IO_EVENT_IRQ) += io_event_irq.o obj-$(CONFIG_LPARCFG) += lparcfg.o +obj-$(CONFIG_IBMVIO) += vio.o ifeq ($(CONFIG_PPC_PSERIES),y) obj-$(CONFIG_SUSPEND) += suspend.o diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c new file mode 100644 index 000000000000..2c8fb3ec989e --- /dev/null +++ b/arch/powerpc/platforms/pseries/vio.c @@ -0,0 +1,1705 @@ +/* + * 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 + * Stephen Rothwell + * Robert Jennings + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +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 : ""; + + /* + * 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 */ -- cgit v1.2.3