508 lines
14 KiB
C
508 lines
14 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/errno.h>
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#include <linux/spinlock.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/jhash.h>
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#include <linux/kthread.h>
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#include <rdma/ib_fmr_pool.h>
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#include "core_priv.h"
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#define PFX "fmr_pool: "
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enum {
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IB_FMR_MAX_REMAPS = 32,
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IB_FMR_HASH_BITS = 8,
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IB_FMR_HASH_SIZE = 1 << IB_FMR_HASH_BITS,
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IB_FMR_HASH_MASK = IB_FMR_HASH_SIZE - 1
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};
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/*
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* If an FMR is not in use, then the list member will point to either
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* its pool's free_list (if the FMR can be mapped again; that is,
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* remap_count < pool->max_remaps) or its pool's dirty_list (if the
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* FMR needs to be unmapped before being remapped). In either of
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* these cases it is a bug if the ref_count is not 0. In other words,
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* if ref_count is > 0, then the list member must not be linked into
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* either free_list or dirty_list.
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*
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* The cache_node member is used to link the FMR into a cache bucket
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* (if caching is enabled). This is independent of the reference
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* count of the FMR. When a valid FMR is released, its ref_count is
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* decremented, and if ref_count reaches 0, the FMR is placed in
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* either free_list or dirty_list as appropriate. However, it is not
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* removed from the cache and may be "revived" if a call to
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* ib_fmr_register_physical() occurs before the FMR is remapped. In
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* this case we just increment the ref_count and remove the FMR from
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* free_list/dirty_list.
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*
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* Before we remap an FMR from free_list, we remove it from the cache
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* (to prevent another user from obtaining a stale FMR). When an FMR
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* is released, we add it to the tail of the free list, so that our
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* cache eviction policy is "least recently used."
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*
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* All manipulation of ref_count, list and cache_node is protected by
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* pool_lock to maintain consistency.
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*/
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struct ib_fmr_pool {
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spinlock_t pool_lock;
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int pool_size;
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int max_pages;
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int max_remaps;
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int dirty_watermark;
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int dirty_len;
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struct list_head free_list;
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struct list_head dirty_list;
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struct hlist_head *cache_bucket;
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void (*flush_function)(struct ib_fmr_pool *pool,
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void * arg);
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void *flush_arg;
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struct kthread_worker *worker;
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struct kthread_work work;
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atomic_t req_ser;
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atomic_t flush_ser;
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wait_queue_head_t force_wait;
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};
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static inline u32 ib_fmr_hash(u64 first_page)
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{
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return jhash_2words((u32) first_page, (u32) (first_page >> 32), 0) &
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(IB_FMR_HASH_SIZE - 1);
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}
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/* Caller must hold pool_lock */
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static inline struct ib_pool_fmr *ib_fmr_cache_lookup(struct ib_fmr_pool *pool,
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u64 *page_list,
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int page_list_len,
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u64 io_virtual_address)
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{
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struct hlist_head *bucket;
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struct ib_pool_fmr *fmr;
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if (!pool->cache_bucket)
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return NULL;
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bucket = pool->cache_bucket + ib_fmr_hash(*page_list);
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hlist_for_each_entry(fmr, bucket, cache_node)
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if (io_virtual_address == fmr->io_virtual_address &&
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page_list_len == fmr->page_list_len &&
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!memcmp(page_list, fmr->page_list,
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page_list_len * sizeof *page_list))
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return fmr;
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return NULL;
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}
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static void ib_fmr_batch_release(struct ib_fmr_pool *pool)
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{
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int ret;
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struct ib_pool_fmr *fmr;
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LIST_HEAD(unmap_list);
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LIST_HEAD(fmr_list);
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spin_lock_irq(&pool->pool_lock);
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list_for_each_entry(fmr, &pool->dirty_list, list) {
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hlist_del_init(&fmr->cache_node);
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fmr->remap_count = 0;
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list_add_tail(&fmr->fmr->list, &fmr_list);
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#ifdef DEBUG
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if (fmr->ref_count !=0) {
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pr_warn(PFX "Unmapping FMR 0x%08x with ref count %d\n",
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fmr, fmr->ref_count);
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}
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#endif
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}
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list_splice_init(&pool->dirty_list, &unmap_list);
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pool->dirty_len = 0;
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spin_unlock_irq(&pool->pool_lock);
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if (list_empty(&unmap_list)) {
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return;
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}
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ret = ib_unmap_fmr(&fmr_list);
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if (ret)
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pr_warn(PFX "ib_unmap_fmr returned %d\n", ret);
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spin_lock_irq(&pool->pool_lock);
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list_splice(&unmap_list, &pool->free_list);
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spin_unlock_irq(&pool->pool_lock);
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}
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static void ib_fmr_cleanup_func(struct kthread_work *work)
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{
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struct ib_fmr_pool *pool = container_of(work, struct ib_fmr_pool, work);
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ib_fmr_batch_release(pool);
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atomic_inc(&pool->flush_ser);
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wake_up_interruptible(&pool->force_wait);
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if (pool->flush_function)
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pool->flush_function(pool, pool->flush_arg);
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if (atomic_read(&pool->flush_ser) - atomic_read(&pool->req_ser) < 0)
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kthread_queue_work(pool->worker, &pool->work);
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}
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/**
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* ib_create_fmr_pool - Create an FMR pool
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* @pd:Protection domain for FMRs
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* @params:FMR pool parameters
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*
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* Create a pool of FMRs. Return value is pointer to new pool or
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* error code if creation failed.
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*/
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struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd *pd,
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struct ib_fmr_pool_param *params)
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{
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struct ib_device *device;
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struct ib_fmr_pool *pool;
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int i;
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int ret;
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int max_remaps;
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if (!params)
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return ERR_PTR(-EINVAL);
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device = pd->device;
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if (!device->ops.alloc_fmr || !device->ops.dealloc_fmr ||
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!device->ops.map_phys_fmr || !device->ops.unmap_fmr) {
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dev_info(&device->dev, "Device does not support FMRs\n");
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return ERR_PTR(-ENOSYS);
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}
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if (!device->attrs.max_map_per_fmr)
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max_remaps = IB_FMR_MAX_REMAPS;
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else
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max_remaps = device->attrs.max_map_per_fmr;
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pool = kmalloc(sizeof *pool, GFP_KERNEL);
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if (!pool)
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return ERR_PTR(-ENOMEM);
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pool->cache_bucket = NULL;
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pool->flush_function = params->flush_function;
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pool->flush_arg = params->flush_arg;
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INIT_LIST_HEAD(&pool->free_list);
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INIT_LIST_HEAD(&pool->dirty_list);
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if (params->cache) {
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pool->cache_bucket =
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kmalloc_array(IB_FMR_HASH_SIZE,
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sizeof(*pool->cache_bucket),
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GFP_KERNEL);
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if (!pool->cache_bucket) {
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ret = -ENOMEM;
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goto out_free_pool;
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}
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for (i = 0; i < IB_FMR_HASH_SIZE; ++i)
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INIT_HLIST_HEAD(pool->cache_bucket + i);
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}
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pool->pool_size = 0;
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pool->max_pages = params->max_pages_per_fmr;
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pool->max_remaps = max_remaps;
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pool->dirty_watermark = params->dirty_watermark;
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pool->dirty_len = 0;
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spin_lock_init(&pool->pool_lock);
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atomic_set(&pool->req_ser, 0);
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atomic_set(&pool->flush_ser, 0);
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init_waitqueue_head(&pool->force_wait);
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pool->worker =
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kthread_create_worker(0, "ib_fmr(%s)", dev_name(&device->dev));
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if (IS_ERR(pool->worker)) {
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pr_warn(PFX "couldn't start cleanup kthread worker\n");
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ret = PTR_ERR(pool->worker);
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goto out_free_pool;
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}
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kthread_init_work(&pool->work, ib_fmr_cleanup_func);
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{
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struct ib_pool_fmr *fmr;
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struct ib_fmr_attr fmr_attr = {
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.max_pages = params->max_pages_per_fmr,
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.max_maps = pool->max_remaps,
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.page_shift = params->page_shift
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};
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int bytes_per_fmr = sizeof *fmr;
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if (pool->cache_bucket)
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bytes_per_fmr += params->max_pages_per_fmr * sizeof (u64);
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for (i = 0; i < params->pool_size; ++i) {
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fmr = kmalloc(bytes_per_fmr, GFP_KERNEL);
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if (!fmr)
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goto out_fail;
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fmr->pool = pool;
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fmr->remap_count = 0;
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fmr->ref_count = 0;
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INIT_HLIST_NODE(&fmr->cache_node);
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fmr->fmr = ib_alloc_fmr(pd, params->access, &fmr_attr);
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if (IS_ERR(fmr->fmr)) {
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pr_warn(PFX "fmr_create failed for FMR %d\n",
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i);
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kfree(fmr);
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goto out_fail;
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}
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list_add_tail(&fmr->list, &pool->free_list);
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++pool->pool_size;
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}
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}
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return pool;
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out_free_pool:
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kfree(pool->cache_bucket);
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kfree(pool);
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return ERR_PTR(ret);
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out_fail:
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ib_destroy_fmr_pool(pool);
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return ERR_PTR(-ENOMEM);
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}
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EXPORT_SYMBOL(ib_create_fmr_pool);
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/**
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* ib_destroy_fmr_pool - Free FMR pool
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* @pool:FMR pool to free
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*
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* Destroy an FMR pool and free all associated resources.
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*/
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void ib_destroy_fmr_pool(struct ib_fmr_pool *pool)
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{
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struct ib_pool_fmr *fmr;
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struct ib_pool_fmr *tmp;
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LIST_HEAD(fmr_list);
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int i;
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kthread_destroy_worker(pool->worker);
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ib_fmr_batch_release(pool);
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i = 0;
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list_for_each_entry_safe(fmr, tmp, &pool->free_list, list) {
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if (fmr->remap_count) {
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INIT_LIST_HEAD(&fmr_list);
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list_add_tail(&fmr->fmr->list, &fmr_list);
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ib_unmap_fmr(&fmr_list);
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}
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ib_dealloc_fmr(fmr->fmr);
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list_del(&fmr->list);
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kfree(fmr);
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++i;
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}
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if (i < pool->pool_size)
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pr_warn(PFX "pool still has %d regions registered\n",
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pool->pool_size - i);
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kfree(pool->cache_bucket);
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kfree(pool);
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}
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EXPORT_SYMBOL(ib_destroy_fmr_pool);
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/**
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* ib_flush_fmr_pool - Invalidate all unmapped FMRs
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* @pool:FMR pool to flush
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*
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* Ensure that all unmapped FMRs are fully invalidated.
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*/
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int ib_flush_fmr_pool(struct ib_fmr_pool *pool)
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{
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int serial;
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struct ib_pool_fmr *fmr, *next;
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/*
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* The free_list holds FMRs that may have been used
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* but have not been remapped enough times to be dirty.
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* Put them on the dirty list now so that the cleanup
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* thread will reap them too.
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*/
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spin_lock_irq(&pool->pool_lock);
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list_for_each_entry_safe(fmr, next, &pool->free_list, list) {
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if (fmr->remap_count > 0)
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list_move(&fmr->list, &pool->dirty_list);
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}
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spin_unlock_irq(&pool->pool_lock);
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serial = atomic_inc_return(&pool->req_ser);
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kthread_queue_work(pool->worker, &pool->work);
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if (wait_event_interruptible(pool->force_wait,
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atomic_read(&pool->flush_ser) - serial >= 0))
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return -EINTR;
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return 0;
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}
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EXPORT_SYMBOL(ib_flush_fmr_pool);
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/**
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* ib_fmr_pool_map_phys - Map an FMR from an FMR pool.
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* @pool_handle: FMR pool to allocate FMR from
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* @page_list: List of pages to map
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* @list_len: Number of pages in @page_list
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* @io_virtual_address: I/O virtual address for new FMR
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*/
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struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
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u64 *page_list,
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int list_len,
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u64 io_virtual_address)
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{
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struct ib_fmr_pool *pool = pool_handle;
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struct ib_pool_fmr *fmr;
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unsigned long flags;
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int result;
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if (list_len < 1 || list_len > pool->max_pages)
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return ERR_PTR(-EINVAL);
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spin_lock_irqsave(&pool->pool_lock, flags);
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fmr = ib_fmr_cache_lookup(pool,
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page_list,
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list_len,
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io_virtual_address);
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if (fmr) {
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/* found in cache */
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++fmr->ref_count;
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if (fmr->ref_count == 1) {
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list_del(&fmr->list);
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}
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spin_unlock_irqrestore(&pool->pool_lock, flags);
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return fmr;
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}
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if (list_empty(&pool->free_list)) {
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spin_unlock_irqrestore(&pool->pool_lock, flags);
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return ERR_PTR(-EAGAIN);
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}
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fmr = list_entry(pool->free_list.next, struct ib_pool_fmr, list);
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list_del(&fmr->list);
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hlist_del_init(&fmr->cache_node);
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spin_unlock_irqrestore(&pool->pool_lock, flags);
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result = ib_map_phys_fmr(fmr->fmr, page_list, list_len,
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io_virtual_address);
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if (result) {
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spin_lock_irqsave(&pool->pool_lock, flags);
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list_add(&fmr->list, &pool->free_list);
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spin_unlock_irqrestore(&pool->pool_lock, flags);
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pr_warn(PFX "fmr_map returns %d\n", result);
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return ERR_PTR(result);
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}
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++fmr->remap_count;
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fmr->ref_count = 1;
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if (pool->cache_bucket) {
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fmr->io_virtual_address = io_virtual_address;
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fmr->page_list_len = list_len;
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memcpy(fmr->page_list, page_list, list_len * sizeof(*page_list));
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spin_lock_irqsave(&pool->pool_lock, flags);
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hlist_add_head(&fmr->cache_node,
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pool->cache_bucket + ib_fmr_hash(fmr->page_list[0]));
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spin_unlock_irqrestore(&pool->pool_lock, flags);
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}
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return fmr;
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}
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EXPORT_SYMBOL(ib_fmr_pool_map_phys);
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/**
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* ib_fmr_pool_unmap - Unmap FMR
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* @fmr:FMR to unmap
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*
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* Unmap an FMR. The FMR mapping may remain valid until the FMR is
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* reused (or until ib_flush_fmr_pool() is called).
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*/
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void ib_fmr_pool_unmap(struct ib_pool_fmr *fmr)
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{
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struct ib_fmr_pool *pool;
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unsigned long flags;
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pool = fmr->pool;
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spin_lock_irqsave(&pool->pool_lock, flags);
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--fmr->ref_count;
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if (!fmr->ref_count) {
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if (fmr->remap_count < pool->max_remaps) {
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list_add_tail(&fmr->list, &pool->free_list);
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} else {
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list_add_tail(&fmr->list, &pool->dirty_list);
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if (++pool->dirty_len >= pool->dirty_watermark) {
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atomic_inc(&pool->req_ser);
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kthread_queue_work(pool->worker, &pool->work);
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}
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}
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}
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#ifdef DEBUG
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if (fmr->ref_count < 0)
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pr_warn(PFX "FMR %p has ref count %d < 0\n",
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fmr, fmr->ref_count);
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#endif
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spin_unlock_irqrestore(&pool->pool_lock, flags);
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}
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EXPORT_SYMBOL(ib_fmr_pool_unmap);
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