mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 16:38:12 +00:00
565206aaa6
Since commit d492cc2573
("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the vio_bus_type variable to be a constant
structure as well, placing it into read-only memory which can not be
modified at runtime.
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: "Ricardo B. Marliere" <ricardo@marliere.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240212-bus_cleanup-powerpc2-v2-2-8441b3f77827@marliere.net
1738 lines
49 KiB
C
1738 lines
49 KiB
C
// 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 engebret@us.ibm.com
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* Santiago Leon santil@us.ibm.com
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* Hollis Blanchard <hollisb@us.ibm.com>
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* Stephen Rothwell
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* Robert Jennings <rcjenn@us.ibm.com>
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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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#include <linux/of_irq.h>
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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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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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#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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/* How many ms to delay queued balance work */
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#define VIO_CMO_BALANCE_DELAY 100
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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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* 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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* 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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* 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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* 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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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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* 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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spin_lock_irqsave(&vio_cmo.lock, flags);
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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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/* 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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/* 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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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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* 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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spin_lock_irqsave(&vio_cmo.lock, flags);
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vio_cmo.curr -= size;
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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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/* Remove allocation from device */
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viodev->cmo.allocated -= (reserve_freed + excess_freed);
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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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* 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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* 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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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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* 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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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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/* 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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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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* 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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spin_lock_irqsave(&vio_cmo.lock, flags);
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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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/* 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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goto out;
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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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* 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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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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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
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* already allocated to devices, can be distributed to the devices.
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* The list of devices is iterated through to recalculate the desired
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* entitlement level and to determine how much entitlement above the
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* minimum entitlement is allocated to devices.
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*
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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.
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* Upon completion sizes of the reserve and excess pools are calculated.
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*
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* The system minimum entitlement level is also recalculated here.
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* Entitlement will be reserved for devices even after vio_bus_remove to
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* accommodate reloading the driver. The OF tree is walked to count the
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* number of devices present and this will remove entitlement for devices
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* that have actually left the system after having vio_bus_remove called.
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*/
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static void vio_cmo_balance(struct work_struct *work)
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{
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struct vio_cmo *cmo;
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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 = 0, level, chunk, need;
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int devcount = 0, fulfilled;
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cmo = container_of(work, struct vio_cmo, balance_q.work);
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spin_lock_irqsave(&vio_cmo.lock, flags);
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/* Calculate minimum entitlement and fulfill spare */
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cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT;
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BUG_ON(cmo->min > cmo->entitled);
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cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min));
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cmo->min += cmo->spare;
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cmo->desired = cmo->min;
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/*
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* Determine how much entitlement is available and reset device
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* entitlements
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*/
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avail = cmo->entitled - cmo->spare;
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list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
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viodev = dev_ent->viodev;
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devcount++;
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viodev->cmo.entitled = VIO_CMO_MIN_ENT;
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cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT);
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avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT);
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}
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/*
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* Having provided each device with the minimum entitlement, loop
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* over the devices portioning out the remaining entitlement
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* until there is nothing left.
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*/
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level = VIO_CMO_MIN_ENT;
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while (avail) {
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fulfilled = 0;
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list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
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viodev = dev_ent->viodev;
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if (viodev->cmo.desired <= level) {
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fulfilled++;
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continue;
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}
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/*
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* Give the device up to VIO_CMO_BALANCE_CHUNK
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* bytes of entitlement, but do not exceed the
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* desired level of entitlement for the device.
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*/
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chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK);
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chunk = min(chunk, (viodev->cmo.desired -
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viodev->cmo.entitled));
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viodev->cmo.entitled += chunk;
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/*
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* If the memory for this entitlement increase was
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* already allocated to the device it does not come
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* from the available pool being portioned out.
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*/
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need = max(viodev->cmo.allocated, viodev->cmo.entitled)-
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max(viodev->cmo.allocated, level);
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avail -= need;
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}
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if (fulfilled == devcount)
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break;
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level += VIO_CMO_BALANCE_CHUNK;
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}
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/* Calculate new reserve and excess pool sizes */
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cmo->reserve.size = cmo->min;
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cmo->excess.free = 0;
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cmo->excess.size = 0;
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need = 0;
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list_for_each_entry(dev_ent, &vio_cmo.device_list, list) {
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viodev = dev_ent->viodev;
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/* Calculated reserve size above the minimum entitlement */
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if (viodev->cmo.entitled)
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cmo->reserve.size += (viodev->cmo.entitled -
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VIO_CMO_MIN_ENT);
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/* Calculated used excess entitlement */
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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));
|
|
|
|
ret = vio_cmo_alloc(viodev, alloc_size);
|
|
if (ret)
|
|
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 ret;
|
|
}
|
|
|
|
static void vio_dma_iommu_unmap_sg(struct device *dev,
|
|
struct scatterlist *sglist, int nelems,
|
|
enum dma_data_direction direction,
|
|
unsigned long attrs)
|
|
{
|
|
struct vio_dev *viodev = to_vio_dev(dev);
|
|
struct iommu_table *tbl = 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);
|
|
|
|
/* sysfs bus functions and data structures for CMO */
|
|
|
|
#define viobus_cmo_rd_attr(name) \
|
|
static ssize_t cmo_bus_##name##_show(const 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(const 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(const struct bus_type *bt, char *buf)
|
|
{
|
|
return sprintf(buf, "%lu\n", vio_cmo.high);
|
|
}
|
|
|
|
static ssize_t cmo_high_store(const 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 __init vio_cmo_sysfs_init(void) { }
|
|
#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 __init 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 void 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);
|
|
}
|
|
|
|
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_property_read_bool(of_node, "interrupt-controller")) {
|
|
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_property_present(viodev->dev.of_node, "ibm,my-dma-window")) {
|
|
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 __init 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);
|
|
|
|
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(const struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
const struct vio_dev *vio_dev = to_vio_dev(dev);
|
|
const 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;
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_SMLPAR
|
|
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);
|
|
|
|
const struct bus_type vio_bus_type = {
|
|
.name = "vio",
|
|
.dev_groups = vio_cmo_dev_groups,
|
|
.bus_groups = vio_bus_groups,
|
|
.uevent = vio_hotplug,
|
|
.match = vio_bus_match,
|
|
.probe = vio_bus_probe,
|
|
.remove = vio_bus_remove,
|
|
.shutdown = vio_bus_shutdown,
|
|
};
|
|
#else /* CONFIG_PPC_SMLPAR */
|
|
static struct attribute *vio_dev_attrs[] = {
|
|
&dev_attr_name.attr,
|
|
&dev_attr_devspec.attr,
|
|
&dev_attr_modalias.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(vio_dev);
|
|
|
|
const 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,
|
|
};
|
|
#endif /* CONFIG_PPC_SMLPAR */
|
|
|
|
/**
|
|
* 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);
|