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1728 lines
48 KiB
1728 lines
48 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* IBM PowerPC Virtual I/O Infrastructure Support. |
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* |
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* Copyright (c) 2003,2008 IBM Corp. |
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* Dave Engebretsen [email protected] |
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* Santiago Leon [email protected] |
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* Hollis Blanchard <[email protected]> |
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* Stephen Rothwell |
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* Robert Jennings <[email protected]> |
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*/ |
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|
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#include <linux/cpu.h> |
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#include <linux/types.h> |
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#include <linux/delay.h> |
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#include <linux/stat.h> |
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#include <linux/device.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/console.h> |
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#include <linux/export.h> |
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#include <linux/mm.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/kobject.h> |
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#include <linux/kexec.h> |
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|
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#include <asm/iommu.h> |
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#include <asm/dma.h> |
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#include <asm/vio.h> |
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#include <asm/prom.h> |
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#include <asm/firmware.h> |
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#include <asm/tce.h> |
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#include <asm/page.h> |
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#include <asm/hvcall.h> |
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#include <asm/machdep.h> |
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|
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static struct vio_dev vio_bus_device = { /* fake "parent" device */ |
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.name = "vio", |
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.type = "", |
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.dev.init_name = "vio", |
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.dev.bus = &vio_bus_type, |
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}; |
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|
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#ifdef CONFIG_PPC_SMLPAR |
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/** |
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* vio_cmo_pool - A pool of IO memory for CMO use |
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* |
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* @size: The size of the pool in bytes |
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* @free: The amount of free memory in the pool |
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*/ |
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struct vio_cmo_pool { |
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size_t size; |
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size_t free; |
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}; |
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|
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/* How many ms to delay queued balance work */ |
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#define VIO_CMO_BALANCE_DELAY 100 |
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|
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/* Portion out IO memory to CMO devices by this chunk size */ |
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#define VIO_CMO_BALANCE_CHUNK 131072 |
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|
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/** |
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* vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement |
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* |
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* @vio_dev: struct vio_dev pointer |
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* @list: pointer to other devices on bus that are being tracked |
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*/ |
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struct vio_cmo_dev_entry { |
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struct vio_dev *viodev; |
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struct list_head list; |
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}; |
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|
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/** |
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* vio_cmo - VIO bus accounting structure for CMO entitlement |
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* |
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* @lock: spinlock for entire structure |
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* @balance_q: work queue for balancing system entitlement |
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* @device_list: list of CMO-enabled devices requiring entitlement |
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* @entitled: total system entitlement in bytes |
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* @reserve: pool of memory from which devices reserve entitlement, incl. spare |
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* @excess: pool of excess entitlement not needed for device reserves or spare |
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* @spare: IO memory for device hotplug functionality |
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* @min: minimum necessary for system operation |
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* @desired: desired memory for system operation |
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* @curr: bytes currently allocated |
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* @high: high water mark for IO data usage |
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*/ |
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static struct vio_cmo { |
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spinlock_t lock; |
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struct delayed_work balance_q; |
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struct list_head device_list; |
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size_t entitled; |
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struct vio_cmo_pool reserve; |
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struct vio_cmo_pool excess; |
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size_t spare; |
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size_t min; |
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size_t desired; |
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size_t curr; |
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size_t high; |
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} vio_cmo; |
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|
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/** |
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* vio_cmo_OF_devices - Count the number of OF devices that have DMA windows |
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*/ |
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static int vio_cmo_num_OF_devs(void) |
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{ |
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struct device_node *node_vroot; |
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int count = 0; |
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|
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/* |
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* Count the number of vdevice entries with an |
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* ibm,my-dma-window OF property |
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*/ |
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node_vroot = of_find_node_by_name(NULL, "vdevice"); |
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if (node_vroot) { |
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struct device_node *of_node; |
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struct property *prop; |
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|
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for_each_child_of_node(node_vroot, of_node) { |
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prop = of_find_property(of_node, "ibm,my-dma-window", |
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NULL); |
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if (prop) |
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count++; |
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} |
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} |
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of_node_put(node_vroot); |
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return count; |
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} |
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|
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/** |
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* vio_cmo_alloc - allocate IO memory for CMO-enable devices |
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* |
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* @viodev: VIO device requesting IO memory |
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* @size: size of allocation requested |
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* |
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* Allocations come from memory reserved for the devices and any excess |
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* IO memory available to all devices. The spare pool used to service |
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* hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be |
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* made available. |
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* |
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* Return codes: |
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* 0 for successful allocation and -ENOMEM for a failure |
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*/ |
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static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size) |
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{ |
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unsigned long flags; |
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size_t reserve_free = 0; |
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size_t excess_free = 0; |
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int ret = -ENOMEM; |
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|
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spin_lock_irqsave(&vio_cmo.lock, flags); |
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|
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/* Determine the amount of free entitlement available in reserve */ |
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if (viodev->cmo.entitled > viodev->cmo.allocated) |
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reserve_free = viodev->cmo.entitled - viodev->cmo.allocated; |
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|
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/* If spare is not fulfilled, the excess pool can not be used. */ |
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if (vio_cmo.spare >= VIO_CMO_MIN_ENT) |
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excess_free = vio_cmo.excess.free; |
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|
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/* The request can be satisfied */ |
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if ((reserve_free + excess_free) >= size) { |
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vio_cmo.curr += size; |
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if (vio_cmo.curr > vio_cmo.high) |
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vio_cmo.high = vio_cmo.curr; |
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viodev->cmo.allocated += size; |
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size -= min(reserve_free, size); |
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vio_cmo.excess.free -= size; |
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ret = 0; |
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} |
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|
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spin_unlock_irqrestore(&vio_cmo.lock, flags); |
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return ret; |
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} |
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|
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/** |
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* vio_cmo_dealloc - deallocate IO memory from CMO-enable devices |
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* @viodev: VIO device freeing IO memory |
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* @size: size of deallocation |
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* |
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* IO memory is freed by the device back to the correct memory pools. |
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* The spare pool is replenished first from either memory pool, then |
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* the reserve pool is used to reduce device entitlement, the excess |
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* pool is used to increase the reserve pool toward the desired entitlement |
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* target, and then the remaining memory is returned to the pools. |
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* |
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*/ |
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static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size) |
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{ |
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unsigned long flags; |
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size_t spare_needed = 0; |
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size_t excess_freed = 0; |
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size_t reserve_freed = size; |
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size_t tmp; |
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int balance = 0; |
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|
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spin_lock_irqsave(&vio_cmo.lock, flags); |
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vio_cmo.curr -= size; |
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|
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/* Amount of memory freed from the excess pool */ |
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if (viodev->cmo.allocated > viodev->cmo.entitled) { |
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excess_freed = min(reserve_freed, (viodev->cmo.allocated - |
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viodev->cmo.entitled)); |
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reserve_freed -= excess_freed; |
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} |
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|
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/* Remove allocation from device */ |
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viodev->cmo.allocated -= (reserve_freed + excess_freed); |
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|
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/* Spare is a subset of the reserve pool, replenish it first. */ |
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spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare; |
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|
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/* |
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* Replenish the spare in the reserve pool from the excess pool. |
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* This moves entitlement into the reserve pool. |
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*/ |
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if (spare_needed && excess_freed) { |
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tmp = min(excess_freed, spare_needed); |
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vio_cmo.excess.size -= tmp; |
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vio_cmo.reserve.size += tmp; |
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vio_cmo.spare += tmp; |
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excess_freed -= tmp; |
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spare_needed -= tmp; |
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balance = 1; |
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} |
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|
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/* |
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* Replenish the spare in the reserve pool from the reserve pool. |
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* This removes entitlement from the device down to VIO_CMO_MIN_ENT, |
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* if needed, and gives it to the spare pool. The amount of used |
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* memory in this pool does not change. |
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*/ |
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if (spare_needed && reserve_freed) { |
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tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT)); |
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|
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vio_cmo.spare += tmp; |
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viodev->cmo.entitled -= tmp; |
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reserve_freed -= tmp; |
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spare_needed -= tmp; |
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balance = 1; |
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} |
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|
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/* |
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* Increase the reserve pool until the desired allocation is met. |
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* Move an allocation freed from the excess pool into the reserve |
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* pool and schedule a balance operation. |
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*/ |
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if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) { |
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tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size)); |
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|
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vio_cmo.excess.size -= tmp; |
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vio_cmo.reserve.size += tmp; |
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excess_freed -= tmp; |
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balance = 1; |
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} |
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|
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/* Return memory from the excess pool to that pool */ |
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if (excess_freed) |
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vio_cmo.excess.free += excess_freed; |
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|
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if (balance) |
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schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY); |
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spin_unlock_irqrestore(&vio_cmo.lock, flags); |
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} |
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|
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/** |
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* vio_cmo_entitlement_update - Manage system entitlement changes |
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* |
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* @new_entitlement: new system entitlement to attempt to accommodate |
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* |
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* Increases in entitlement will be used to fulfill the spare entitlement |
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* and the rest is given to the excess pool. Decreases, if they are |
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* possible, come from the excess pool and from unused device entitlement |
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* |
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* Returns: 0 on success, -ENOMEM when change can not be made |
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*/ |
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int vio_cmo_entitlement_update(size_t new_entitlement) |
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{ |
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struct vio_dev *viodev; |
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struct vio_cmo_dev_entry *dev_ent; |
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unsigned long flags; |
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size_t avail, delta, tmp; |
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|
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spin_lock_irqsave(&vio_cmo.lock, flags); |
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|
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/* Entitlement increases */ |
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if (new_entitlement > vio_cmo.entitled) { |
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delta = new_entitlement - vio_cmo.entitled; |
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|
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/* Fulfill spare allocation */ |
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if (vio_cmo.spare < VIO_CMO_MIN_ENT) { |
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tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare)); |
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vio_cmo.spare += tmp; |
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vio_cmo.reserve.size += tmp; |
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delta -= tmp; |
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} |
|
|
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/* Remaining new allocation goes to the excess pool */ |
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vio_cmo.entitled += delta; |
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vio_cmo.excess.size += delta; |
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vio_cmo.excess.free += delta; |
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|
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goto out; |
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} |
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|
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/* Entitlement decreases */ |
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delta = vio_cmo.entitled - new_entitlement; |
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avail = vio_cmo.excess.free; |
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|
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/* |
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* Need to check how much unused entitlement each device can |
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* sacrifice to fulfill entitlement change. |
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*/ |
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list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { |
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if (avail >= delta) |
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break; |
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|
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viodev = dev_ent->viodev; |
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if ((viodev->cmo.entitled > viodev->cmo.allocated) && |
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(viodev->cmo.entitled > VIO_CMO_MIN_ENT)) |
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avail += viodev->cmo.entitled - |
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max_t(size_t, viodev->cmo.allocated, |
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VIO_CMO_MIN_ENT); |
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} |
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|
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if (delta <= avail) { |
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vio_cmo.entitled -= delta; |
|
|
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/* Take entitlement from the excess pool first */ |
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tmp = min(vio_cmo.excess.free, delta); |
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vio_cmo.excess.size -= tmp; |
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vio_cmo.excess.free -= tmp; |
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delta -= tmp; |
|
|
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/* |
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* Remove all but VIO_CMO_MIN_ENT bytes from devices |
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* until entitlement change is served |
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*/ |
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list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { |
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if (!delta) |
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break; |
|
|
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viodev = dev_ent->viodev; |
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tmp = 0; |
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if ((viodev->cmo.entitled > viodev->cmo.allocated) && |
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(viodev->cmo.entitled > VIO_CMO_MIN_ENT)) |
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tmp = viodev->cmo.entitled - |
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max_t(size_t, viodev->cmo.allocated, |
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VIO_CMO_MIN_ENT); |
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viodev->cmo.entitled -= min(tmp, delta); |
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delta -= min(tmp, delta); |
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} |
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} else { |
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spin_unlock_irqrestore(&vio_cmo.lock, flags); |
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return -ENOMEM; |
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} |
|
|
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out: |
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schedule_delayed_work(&vio_cmo.balance_q, 0); |
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spin_unlock_irqrestore(&vio_cmo.lock, flags); |
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return 0; |
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} |
|
|
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/** |
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* vio_cmo_balance - Balance entitlement among devices |
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* |
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* @work: work queue structure for this operation |
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* |
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* 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 |
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* minimum entitlement is allocated to devices. |
|
* |
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* Small chunks of the available entitlement are given to devices until |
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* 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 = iommu_alloc_coherent(dev, get_iommu_table_base(dev), size, |
|
dma_handle, dev->coherent_dma_mask, flag, |
|
dev_to_node(dev)); |
|
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); |
|
|
|
iommu_free_coherent(get_iommu_table_base(dev), size, vaddr, dma_handle); |
|
vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE)); |
|
} |
|
|
|
static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page, |
|
unsigned long offset, size_t size, |
|
enum dma_data_direction direction, |
|
unsigned long attrs) |
|
{ |
|
struct vio_dev *viodev = to_vio_dev(dev); |
|
struct iommu_table *tbl = get_iommu_table_base(dev); |
|
dma_addr_t ret = DMA_MAPPING_ERROR; |
|
|
|
if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)))) |
|
goto out_fail; |
|
ret = iommu_map_page(dev, tbl, page, offset, size, dma_get_mask(dev), |
|
direction, attrs); |
|
if (unlikely(ret == DMA_MAPPING_ERROR)) |
|
goto out_deallocate; |
|
return ret; |
|
|
|
out_deallocate: |
|
vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl))); |
|
out_fail: |
|
atomic_inc(&viodev->cmo.allocs_failed); |
|
return DMA_MAPPING_ERROR; |
|
} |
|
|
|
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 = get_iommu_table_base(dev); |
|
|
|
iommu_unmap_page(tbl, 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 = get_iommu_table_base(dev); |
|
struct scatterlist *sgl; |
|
int ret, count; |
|
size_t alloc_size = 0; |
|
|
|
for_each_sg(sglist, sgl, nelems, count) |
|
alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl)); |
|
|
|
if (vio_cmo_alloc(viodev, alloc_size)) |
|
goto out_fail; |
|
ret = ppc_iommu_map_sg(dev, tbl, sglist, nelems, dma_get_mask(dev), |
|
direction, attrs); |
|
if (unlikely(!ret)) |
|
goto out_deallocate; |
|
|
|
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; |
|
|
|
out_deallocate: |
|
vio_cmo_dealloc(viodev, alloc_size); |
|
out_fail: |
|
atomic_inc(&viodev->cmo.allocs_failed); |
|
return 0; |
|
} |
|
|
|
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 = get_iommu_table_base(dev); |
|
struct scatterlist *sgl; |
|
size_t alloc_size = 0; |
|
int count; |
|
|
|
for_each_sg(sglist, sgl, nelems, count) |
|
alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl)); |
|
|
|
ppc_iommu_unmap_sg(tbl, sglist, nelems, direction, attrs); |
|
vio_cmo_dealloc(viodev, alloc_size); |
|
} |
|
|
|
static const struct dma_map_ops vio_dma_mapping_ops = { |
|
.alloc = vio_dma_iommu_alloc_coherent, |
|
.free = vio_dma_iommu_free_coherent, |
|
.map_sg = vio_dma_iommu_map_sg, |
|
.unmap_sg = vio_dma_iommu_unmap_sg, |
|
.map_page = vio_dma_iommu_map_page, |
|
.unmap_page = vio_dma_iommu_unmap_page, |
|
.dma_supported = dma_iommu_dma_supported, |
|
.get_required_mask = dma_iommu_get_required_mask, |
|
.mmap = dma_common_mmap, |
|
.get_sgtable = dma_common_get_sgtable, |
|
.alloc_pages = dma_common_alloc_pages, |
|
.free_pages = dma_common_free_pages, |
|
}; |
|
|
|
/** |
|
* 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 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 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 cmo_allocs_failed_store(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 cmo_desired_store(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 dev_attr_name; |
|
static struct device_attribute dev_attr_devspec; |
|
static struct device_attribute dev_attr_modalias; |
|
|
|
static DEVICE_ATTR_RO(cmo_entitled); |
|
static DEVICE_ATTR_RO(cmo_allocated); |
|
static DEVICE_ATTR_RW(cmo_desired); |
|
static DEVICE_ATTR_RW(cmo_allocs_failed); |
|
|
|
static struct attribute *vio_cmo_dev_attrs[] = { |
|
&dev_attr_name.attr, |
|
&dev_attr_devspec.attr, |
|
&dev_attr_modalias.attr, |
|
&dev_attr_cmo_entitled.attr, |
|
&dev_attr_cmo_allocated.attr, |
|
&dev_attr_cmo_desired.attr, |
|
&dev_attr_cmo_allocs_failed.attr, |
|
NULL, |
|
}; |
|
ATTRIBUTE_GROUPS(vio_cmo_dev); |
|
|
|
/* sysfs bus functions and data structures for CMO */ |
|
|
|
#define viobus_cmo_rd_attr(name) \ |
|
static ssize_t cmo_bus_##name##_show(struct bus_type *bt, char *buf) \ |
|
{ \ |
|
return sprintf(buf, "%lu\n", vio_cmo.name); \ |
|
} \ |
|
static struct bus_attribute bus_attr_cmo_bus_##name = \ |
|
__ATTR(cmo_##name, S_IRUGO, cmo_bus_##name##_show, NULL) |
|
|
|
#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_bus_entitled.attr, |
|
&bus_attr_cmo_bus_spare.attr, |
|
&bus_attr_cmo_bus_min.attr, |
|
&bus_attr_cmo_bus_desired.attr, |
|
&bus_attr_cmo_bus_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_groups = vio_cmo_dev_groups; |
|
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; |
|
|
|
kref_init(&tbl->it_kref); |
|
|
|
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, 0, 0); |
|
} |
|
|
|
/** |
|
* 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; |
|
|
|
/* |
|
* 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) |
|
viodrv->remove(viodev); |
|
|
|
if (firmware_has_feature(FW_FEATURE_CMO)) |
|
vio_cmo_bus_remove(viodev); |
|
|
|
put_device(devptr); |
|
return 0; |
|
} |
|
|
|
static void vio_bus_shutdown(struct device *dev) |
|
{ |
|
struct vio_dev *viodev = to_vio_dev(dev); |
|
struct vio_driver *viodrv; |
|
|
|
if (dev->driver) { |
|
viodrv = to_vio_driver(dev->driver); |
|
if (viodrv->shutdown) |
|
viodrv->shutdown(viodev); |
|
else if (kexec_in_progress) |
|
vio_bus_remove(dev); |
|
} |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
// vio_bus_type is only initialised for pseries |
|
if (!machine_is(pseries)) |
|
return -ENODEV; |
|
|
|
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_tce_table_put(tbl); |
|
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; |
|
|
|
/* |
|
* 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 (of_node_is_type(parent_node, "ibm,platform-facilities")) |
|
family = PFO; |
|
else if (of_node_is_type(parent_node, "vdevice")) |
|
family = VDEVICE; |
|
else { |
|
pr_warn("%s: parent(%pOF) of %pOFn not recognized.\n", |
|
__func__, |
|
parent_node, |
|
of_node); |
|
of_node_put(parent_node); |
|
return NULL; |
|
} |
|
of_node_put(parent_node); |
|
} else { |
|
pr_warn("%s: could not determine the parent of node %pOFn.\n", |
|
__func__, of_node); |
|
return NULL; |
|
} |
|
|
|
if (family == PFO) { |
|
if (of_get_property(of_node, "interrupt-controller", NULL)) { |
|
pr_debug("%s: Skipping the interrupt controller %pOFn.\n", |
|
__func__, of_node); |
|
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; |
|
|
|
viodev->type = of_node_get_device_type(of_node); |
|
if (!viodev->type) { |
|
pr_warn("%s: node %pOFn is missing the 'device_type' " |
|
"property.\n", __func__, of_node); |
|
goto out; |
|
} |
|
|
|
prop = of_get_property(of_node, "reg", NULL); |
|
if (prop == NULL) { |
|
pr_warn("%s: node %pOFn missing 'reg'\n", |
|
__func__, of_node); |
|
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, "%pOFn", of_node); |
|
viodev->type = dev_name(&viodev->dev); |
|
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; |
|
} |
|
machine_postcore_initcall(pseries, 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; |
|
} |
|
machine_device_initcall(pseries, 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 DEVICE_ATTR_RO(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, "%pOF\n", of_node); |
|
} |
|
static DEVICE_ATTR_RO(devspec); |
|
|
|
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 DEVICE_ATTR_RO(modalias); |
|
|
|
static struct attribute *vio_dev_attrs[] = { |
|
&dev_attr_name.attr, |
|
&dev_attr_devspec.attr, |
|
&dev_attr_modalias.attr, |
|
NULL, |
|
}; |
|
ATTRIBUTE_GROUPS(vio_dev); |
|
|
|
void vio_unregister_device(struct vio_dev *viodev) |
|
{ |
|
device_unregister(&viodev->dev); |
|
if (viodev->family == VDEVICE) |
|
irq_dispose_mapping(viodev->irq); |
|
} |
|
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_groups = vio_dev_groups, |
|
.uevent = vio_hotplug, |
|
.match = vio_bus_match, |
|
.probe = vio_bus_probe, |
|
.remove = vio_bus_remove, |
|
.shutdown = vio_bus_shutdown, |
|
}; |
|
|
|
/** |
|
* 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); |
|
|
|
/* 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; |
|
|
|
vnode_parent = of_get_parent(vnode); |
|
if (!vnode_parent) |
|
return NULL; |
|
|
|
/* construct the kobject name from the device node */ |
|
if (of_node_is_type(vnode_parent, "vdevice")) { |
|
const __be32 *prop; |
|
|
|
prop = of_get_property(vnode, "reg", NULL); |
|
if (!prop) |
|
goto out; |
|
snprintf(kobj_name, sizeof(kobj_name), "%x", |
|
(uint32_t)of_read_number(prop, 1)); |
|
} else if (of_node_is_type(vnode_parent, "ibm,platform-facilities")) |
|
snprintf(kobj_name, sizeof(kobj_name), "%pOFn", vnode); |
|
else |
|
goto out; |
|
|
|
of_node_put(vnode_parent); |
|
return vio_find_name(kobj_name); |
|
out: |
|
of_node_put(vnode_parent); |
|
return NULL; |
|
} |
|
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); |
|
|
|
static int __init vio_init(void) |
|
{ |
|
dma_debug_add_bus(&vio_bus_type); |
|
return 0; |
|
} |
|
machine_fs_initcall(pseries, vio_init);
|
|
|