| /* |
| * IBM PowerPC Virtual I/O Infrastructure Support. |
| * |
| * Copyright (c) 2003,2008 IBM Corp. |
| * Dave Engebretsen engebret@us.ibm.com |
| * Santiago Leon santil@us.ibm.com |
| * Hollis Blanchard <hollisb@us.ibm.com> |
| * Stephen Rothwell |
| * Robert Jennings <rcjenn@us.ibm.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/cpu.h> |
| #include <linux/types.h> |
| #include <linux/delay.h> |
| #include <linux/stat.h> |
| #include <linux/device.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/console.h> |
| #include <linux/export.h> |
| #include <linux/mm.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/kobject.h> |
| |
| #include <asm/iommu.h> |
| #include <asm/dma.h> |
| #include <asm/vio.h> |
| #include <asm/prom.h> |
| #include <asm/firmware.h> |
| #include <asm/tce.h> |
| #include <asm/page.h> |
| #include <asm/hvcall.h> |
| |
| static struct vio_dev vio_bus_device = { /* fake "parent" device */ |
| .name = "vio", |
| .type = "", |
| .dev.init_name = "vio", |
| .dev.bus = &vio_bus_type, |
| }; |
| |
| #ifdef CONFIG_PPC_SMLPAR |
| /** |
| * vio_cmo_pool - A pool of IO memory for CMO use |
| * |
| * @size: The size of the pool in bytes |
| * @free: The amount of free memory in the pool |
| */ |
| struct vio_cmo_pool { |
| size_t size; |
| size_t free; |
| }; |
| |
| /* How many ms to delay queued balance work */ |
| #define VIO_CMO_BALANCE_DELAY 100 |
| |
| /* Portion out IO memory to CMO devices by this chunk size */ |
| #define VIO_CMO_BALANCE_CHUNK 131072 |
| |
| /** |
| * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement |
| * |
| * @vio_dev: struct vio_dev pointer |
| * @list: pointer to other devices on bus that are being tracked |
| */ |
| struct vio_cmo_dev_entry { |
| struct vio_dev *viodev; |
| struct list_head list; |
| }; |
| |
| /** |
| * vio_cmo - VIO bus accounting structure for CMO entitlement |
| * |
| * @lock: spinlock for entire structure |
| * @balance_q: work queue for balancing system entitlement |
| * @device_list: list of CMO-enabled devices requiring entitlement |
| * @entitled: total system entitlement in bytes |
| * @reserve: pool of memory from which devices reserve entitlement, incl. spare |
| * @excess: pool of excess entitlement not needed for device reserves or spare |
| * @spare: IO memory for device hotplug functionality |
| * @min: minimum necessary for system operation |
| * @desired: desired memory for system operation |
| * @curr: bytes currently allocated |
| * @high: high water mark for IO data usage |
| */ |
| 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, |
| struct dma_attrs *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, |
| struct dma_attrs *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, |
| struct dma_attrs *attrs) |
| { |
| struct vio_dev *viodev = to_vio_dev(dev); |
| dma_addr_t ret = DMA_ERROR_CODE; |
| |
| if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE))) { |
| atomic_inc(&viodev->cmo.allocs_failed); |
| return ret; |
| } |
| |
| ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs); |
| if (unlikely(dma_mapping_error(dev, ret))) { |
| vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE)); |
| atomic_inc(&viodev->cmo.allocs_failed); |
| } |
| |
| return ret; |
| } |
| |
| static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle, |
| size_t size, |
| enum dma_data_direction direction, |
| struct dma_attrs *attrs) |
| { |
| struct vio_dev *viodev = to_vio_dev(dev); |
| |
| dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs); |
| |
| vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE)); |
| } |
| |
| static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, |
| int nelems, enum dma_data_direction direction, |
| struct dma_attrs *attrs) |
| { |
| struct vio_dev *viodev = to_vio_dev(dev); |
| struct scatterlist *sgl; |
| int ret, count = 0; |
| size_t alloc_size = 0; |
| |
| for (sgl = sglist; count < nelems; count++, sgl++) |
| alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE); |
| |
| if (vio_cmo_alloc(viodev, alloc_size)) { |
| atomic_inc(&viodev->cmo.allocs_failed); |
| return 0; |
| } |
| |
| ret = dma_iommu_ops.map_sg(dev, sglist, nelems, direction, attrs); |
| |
| if (unlikely(!ret)) { |
| vio_cmo_dealloc(viodev, alloc_size); |
| atomic_inc(&viodev->cmo.allocs_failed); |
| return ret; |
| } |
| |
| for (sgl = sglist, count = 0; count < ret; count++, sgl++) |
| alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE); |
| if (alloc_size) |
| vio_cmo_dealloc(viodev, alloc_size); |
| |
| return ret; |
| } |
| |
| static void vio_dma_iommu_unmap_sg(struct device *dev, |
| struct scatterlist *sglist, int nelems, |
| enum dma_data_direction direction, |
| struct dma_attrs *attrs) |
| { |
| struct vio_dev *viodev = to_vio_dev(dev); |
| struct scatterlist *sgl; |
| size_t alloc_size = 0; |
| int count = 0; |
| |
| for (sgl = sglist; count < nelems; count++, sgl++) |
| alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE); |
| |
| dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs); |
| |
| vio_cmo_dealloc(viodev, alloc_size); |
| } |
| |
| 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); |
| } |
| |
| 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 vio_driver *viodrv = to_vio_driver(dev->driver); |
| unsigned long flags; |
| size_t size; |
| bool dma_capable = false; |
| |
| /* 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)); |
| 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 = strict_strtoul(buf, 10, &new_desired); |
| if (ret) |
| return ret; |
| |
| vio_cmo_set_dev_desired(viodev, new_desired); |
| return count; |
| } |
| |
| viodev_cmo_rd_attr(desired); |
| viodev_cmo_rd_attr(entitled); |
| viodev_cmo_rd_attr(allocated); |
| |
| static ssize_t name_show(struct device *, struct device_attribute *, char *); |
| static ssize_t devspec_show(struct device *, struct device_attribute *, char *); |
| static 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_size = size >> IOMMU_PAGE_SHIFT; |
| /* offset for VIO should always be 0 */ |
| tbl->it_offset = offset >> IOMMU_PAGE_SHIFT; |
| tbl->it_busno = 0; |
| tbl->it_type = TCE_VB; |
| tbl->it_blocksize = 16; |
| |
| return iommu_init_table(tbl, -1); |
| } |
| |
| /** |
| * vio_match_device: - Tell if a VIO device has a matching |
| * VIO device id structure. |
| * @ids: array of VIO device id structures to search in |
| * @dev: the VIO device structure to match against |
| * |
| * Used by a driver to check whether a VIO device present in the |
| * system is in its list of supported devices. Returns the matching |
| * vio_device_id structure or NULL if there is no match. |
| */ |
| static const struct vio_device_id *vio_match_device( |
| const struct vio_device_id *ids, const struct vio_dev *dev) |
| { |
| while (ids->type[0] != '\0') { |
| if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) && |
| of_device_is_compatible(dev->dev.of_node, |
| ids->compat)) |
| return ids; |
| ids++; |
| } |
| return NULL; |
| } |
| |
| /* |
| * Convert from struct device to struct vio_dev and pass to driver. |
| * dev->driver has already been set by generic code because vio_bus_match |
| * succeeded. |
| */ |
| static int vio_bus_probe(struct device *dev) |
| { |
| struct vio_dev *viodev = to_vio_dev(dev); |
| struct vio_driver *viodrv = to_vio_driver(dev->driver); |
| const struct vio_device_id *id; |
| int error = -ENODEV; |
| |
| if (!viodrv->probe) |
| return error; |
| |
| id = vio_match_device(viodrv->id_table, viodev); |
| if (id) { |
| memset(&viodev->cmo, 0, sizeof(viodev->cmo)); |
| if (firmware_has_feature(FW_FEATURE_CMO)) { |
| error = vio_cmo_bus_probe(viodev); |
| if (error) |
| return error; |
| } |
| error = viodrv->probe(viodev, id); |
| if (error && firmware_has_feature(FW_FEATURE_CMO)) |
| vio_cmo_bus_remove(viodev); |
| } |
| |
| return error; |
| } |
| |
| /* convert from struct device to struct vio_dev and pass to driver. */ |
| static int vio_bus_remove(struct device *dev) |
| { |
| struct vio_dev *viodev = to_vio_dev(dev); |
| struct vio_driver *viodrv = to_vio_driver(dev->driver); |
| struct device *devptr; |
| int ret = 1; |
| |
| /* |
| * Hold a reference to the device after the remove function is called |
| * to allow for CMO accounting cleanup for the device. |
| */ |
| devptr = get_device(dev); |
| |
| if (viodrv->remove) |
| ret = viodrv->remove(viodev); |
| |
| if (!ret && firmware_has_feature(FW_FEATURE_CMO)) |
| vio_cmo_bus_remove(viodev); |
| |
| put_device(devptr); |
| return ret; |
| } |
| |
| /** |
| * vio_register_driver: - Register a new vio driver |
| * @viodrv: The vio_driver structure to be registered. |
| */ |
| int __vio_register_driver(struct vio_driver *viodrv, struct module *owner, |
| const char *mod_name) |
| { |
| pr_debug("%s: driver %s registering\n", __func__, viodrv->name); |
| |
| /* fill in 'struct driver' fields */ |
| viodrv->driver.name = viodrv->name; |
| viodrv->driver.pm = viodrv->pm; |
| viodrv->driver.bus = &vio_bus_type; |
| viodrv->driver.owner = owner; |
| viodrv->driver.mod_name = mod_name; |
| |
| return driver_register(&viodrv->driver); |
| } |
| EXPORT_SYMBOL(__vio_register_driver); |
| |
| /** |
| * vio_unregister_driver - Remove registration of vio driver. |
| * @viodrv: The vio_driver struct to be removed form registration |
| */ |
| void vio_unregister_driver(struct vio_driver *viodrv) |
| { |
| driver_unregister(&viodrv->driver); |
| } |
| EXPORT_SYMBOL(vio_unregister_driver); |
| |
| /* vio_dev refcount hit 0 */ |
| static void vio_dev_release(struct device *dev) |
| { |
| struct iommu_table *tbl = get_iommu_table_base(dev); |
| |
| if (tbl) |
| iommu_free_table(tbl, of_node_full_name(dev->of_node)); |
| of_node_put(dev->of_node); |
| kfree(to_vio_dev(dev)); |
| } |
| |
| /** |
| * vio_register_device_node: - Register a new vio device. |
| * @of_node: The OF node for this device. |
| * |
| * Creates and initializes a vio_dev structure from the data in |
| * of_node and adds it to the list of virtual devices. |
| * Returns a pointer to the created vio_dev or NULL if node has |
| * NULL device_type or compatible fields. |
| */ |
| struct vio_dev *vio_register_device_node(struct device_node *of_node) |
| { |
| struct vio_dev *viodev; |
| struct device_node *parent_node; |
| const __be32 *prop; |
| enum vio_dev_family family; |
| const char *of_node_name = of_node->name ? of_node->name : "<unknown>"; |
| |
| /* |
| * Determine if this node is a under the /vdevice node or under the |
| * /ibm,platform-facilities node. This decides the device's family. |
| */ |
| parent_node = of_get_parent(of_node); |
| if (parent_node) { |
| if (!strcmp(parent_node->full_name, "/ibm,platform-facilities")) |
| family = PFO; |
| else if (!strcmp(parent_node->full_name, "/vdevice")) |
| family = VDEVICE; |
| else { |
| pr_warn("%s: parent(%s) of %s not recognized.\n", |
| __func__, |
| parent_node->full_name, |
| of_node_name); |
| of_node_put(parent_node); |
| return NULL; |
| } |
| of_node_put(parent_node); |
| } else { |
| pr_warn("%s: could not determine the parent of node %s.\n", |
| __func__, of_node_name); |
| return NULL; |
| } |
| |
| if (family == PFO) { |
| if (of_get_property(of_node, "interrupt-controller", NULL)) { |
| pr_debug("%s: Skipping the interrupt controller %s.\n", |
| __func__, of_node_name); |
| return NULL; |
| } |
| } |
| |
| /* allocate a vio_dev for this node */ |
| viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL); |
| if (viodev == NULL) { |
| pr_warn("%s: allocation failure for VIO device.\n", __func__); |
| return NULL; |
| } |
| |
| /* we need the 'device_type' property, in order to match with drivers */ |
| viodev->family = family; |
| if (viodev->family == VDEVICE) { |
| unsigned int unit_address; |
| |
| if (of_node->type != NULL) |
| viodev->type = of_node->type; |
| else { |
| pr_warn("%s: node %s is missing the 'device_type' " |
| "property.\n", __func__, of_node_name); |
| goto out; |
| } |
| |
| prop = of_get_property(of_node, "reg", NULL); |
| if (prop == NULL) { |
| pr_warn("%s: node %s missing 'reg'\n", |
| __func__, of_node_name); |
| goto out; |
| } |
| unit_address = of_read_number(prop, 1); |
| dev_set_name(&viodev->dev, "%x", unit_address); |
| viodev->irq = irq_of_parse_and_map(of_node, 0); |
| viodev->unit_address = unit_address; |
| } else { |
| /* PFO devices need their resource_id for submitting COP_OPs |
| * This is an optional field for devices, but is required when |
| * performing synchronous ops */ |
| prop = of_get_property(of_node, "ibm,resource-id", NULL); |
| if (prop != NULL) |
| viodev->resource_id = of_read_number(prop, 1); |
| |
| dev_set_name(&viodev->dev, "%s", of_node_name); |
| viodev->type = of_node_name; |
| viodev->irq = 0; |
| } |
| |
| viodev->name = of_node->name; |
| viodev->dev.of_node = of_node_get(of_node); |
| |
| set_dev_node(&viodev->dev, of_node_to_nid(of_node)); |
| |
| /* init generic 'struct device' fields: */ |
| viodev->dev.parent = &vio_bus_device.dev; |
| viodev->dev.bus = &vio_bus_type; |
| viodev->dev.release = vio_dev_release; |
| |
| if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) { |
| if (firmware_has_feature(FW_FEATURE_CMO)) |
| vio_cmo_set_dma_ops(viodev); |
| else |
| set_dma_ops(&viodev->dev, &dma_iommu_ops); |
| |
| set_iommu_table_base(&viodev->dev, |
| vio_build_iommu_table(viodev)); |
| |
| /* needed to ensure proper operation of coherent allocations |
| * later, in case driver doesn't set it explicitly */ |
| dma_coerce_mask_and_coherent(&viodev->dev, DMA_BIT_MASK(64)); |
| } |
| |
| /* 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 |
| */ |
| 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 */ |