+++ /dev/null
-/*
- * Copyright (c) 2004 Topspin Communications. All rights reserved.
- * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses. You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials
- * provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#include <linux/errno.h>
-#include <linux/spinlock.h>
-#include <linux/export.h>
-#include <linux/slab.h>
-#include <linux/jhash.h>
-#include <linux/kthread.h>
-
-#include <rdma/ib_fmr_pool.h>
-
-#include "core_priv.h"
-
-#define PFX "fmr_pool: "
-
-enum {
- IB_FMR_MAX_REMAPS = 32,
-
- IB_FMR_HASH_BITS = 8,
- IB_FMR_HASH_SIZE = 1 << IB_FMR_HASH_BITS,
- IB_FMR_HASH_MASK = IB_FMR_HASH_SIZE - 1
-};
-
-/*
- * If an FMR is not in use, then the list member will point to either
- * its pool's free_list (if the FMR can be mapped again; that is,
- * remap_count < pool->max_remaps) or its pool's dirty_list (if the
- * FMR needs to be unmapped before being remapped). In either of
- * these cases it is a bug if the ref_count is not 0. In other words,
- * if ref_count is > 0, then the list member must not be linked into
- * either free_list or dirty_list.
- *
- * The cache_node member is used to link the FMR into a cache bucket
- * (if caching is enabled). This is independent of the reference
- * count of the FMR. When a valid FMR is released, its ref_count is
- * decremented, and if ref_count reaches 0, the FMR is placed in
- * either free_list or dirty_list as appropriate. However, it is not
- * removed from the cache and may be "revived" if a call to
- * ib_fmr_register_physical() occurs before the FMR is remapped. In
- * this case we just increment the ref_count and remove the FMR from
- * free_list/dirty_list.
- *
- * Before we remap an FMR from free_list, we remove it from the cache
- * (to prevent another user from obtaining a stale FMR). When an FMR
- * is released, we add it to the tail of the free list, so that our
- * cache eviction policy is "least recently used."
- *
- * All manipulation of ref_count, list and cache_node is protected by
- * pool_lock to maintain consistency.
- */
-
-struct ib_fmr_pool {
- spinlock_t pool_lock;
-
- int pool_size;
- int max_pages;
- int max_remaps;
- int dirty_watermark;
- int dirty_len;
- struct list_head free_list;
- struct list_head dirty_list;
- struct hlist_head *cache_bucket;
-
- void (*flush_function)(struct ib_fmr_pool *pool,
- void * arg);
- void *flush_arg;
-
- struct kthread_worker *worker;
- struct kthread_work work;
-
- atomic_t req_ser;
- atomic_t flush_ser;
-
- wait_queue_head_t force_wait;
-};
-
-static inline u32 ib_fmr_hash(u64 first_page)
-{
- return jhash_2words((u32) first_page, (u32) (first_page >> 32), 0) &
- (IB_FMR_HASH_SIZE - 1);
-}
-
-/* Caller must hold pool_lock */
-static inline struct ib_pool_fmr *ib_fmr_cache_lookup(struct ib_fmr_pool *pool,
- u64 *page_list,
- int page_list_len,
- u64 io_virtual_address)
-{
- struct hlist_head *bucket;
- struct ib_pool_fmr *fmr;
-
- if (!pool->cache_bucket)
- return NULL;
-
- bucket = pool->cache_bucket + ib_fmr_hash(*page_list);
-
- hlist_for_each_entry(fmr, bucket, cache_node)
- if (io_virtual_address == fmr->io_virtual_address &&
- page_list_len == fmr->page_list_len &&
- !memcmp(page_list, fmr->page_list,
- page_list_len * sizeof *page_list))
- return fmr;
-
- return NULL;
-}
-
-static void ib_fmr_batch_release(struct ib_fmr_pool *pool)
-{
- int ret;
- struct ib_pool_fmr *fmr;
- LIST_HEAD(unmap_list);
- LIST_HEAD(fmr_list);
-
- spin_lock_irq(&pool->pool_lock);
-
- list_for_each_entry(fmr, &pool->dirty_list, list) {
- hlist_del_init(&fmr->cache_node);
- fmr->remap_count = 0;
- list_add_tail(&fmr->fmr->list, &fmr_list);
- }
-
- list_splice_init(&pool->dirty_list, &unmap_list);
- pool->dirty_len = 0;
-
- spin_unlock_irq(&pool->pool_lock);
-
- if (list_empty(&unmap_list)) {
- return;
- }
-
- ret = ib_unmap_fmr(&fmr_list);
- if (ret)
- pr_warn(PFX "ib_unmap_fmr returned %d\n", ret);
-
- spin_lock_irq(&pool->pool_lock);
- list_splice(&unmap_list, &pool->free_list);
- spin_unlock_irq(&pool->pool_lock);
-}
-
-static void ib_fmr_cleanup_func(struct kthread_work *work)
-{
- struct ib_fmr_pool *pool = container_of(work, struct ib_fmr_pool, work);
-
- ib_fmr_batch_release(pool);
- atomic_inc(&pool->flush_ser);
- wake_up_interruptible(&pool->force_wait);
-
- if (pool->flush_function)
- pool->flush_function(pool, pool->flush_arg);
-
- if (atomic_read(&pool->flush_ser) - atomic_read(&pool->req_ser) < 0)
- kthread_queue_work(pool->worker, &pool->work);
-}
-
-/**
- * ib_create_fmr_pool - Create an FMR pool
- * @pd:Protection domain for FMRs
- * @params:FMR pool parameters
- *
- * Create a pool of FMRs. Return value is pointer to new pool or
- * error code if creation failed.
- */
-struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd *pd,
- struct ib_fmr_pool_param *params)
-{
- struct ib_device *device;
- struct ib_fmr_pool *pool;
- int i;
- int ret;
- int max_remaps;
-
- if (!params)
- return ERR_PTR(-EINVAL);
-
- device = pd->device;
- if (!device->ops.alloc_fmr || !device->ops.dealloc_fmr ||
- !device->ops.map_phys_fmr || !device->ops.unmap_fmr) {
- dev_info(&device->dev, "Device does not support FMRs\n");
- return ERR_PTR(-ENOSYS);
- }
-
- if (!device->attrs.max_map_per_fmr)
- max_remaps = IB_FMR_MAX_REMAPS;
- else
- max_remaps = device->attrs.max_map_per_fmr;
-
- pool = kmalloc(sizeof *pool, GFP_KERNEL);
- if (!pool)
- return ERR_PTR(-ENOMEM);
-
- pool->cache_bucket = NULL;
- pool->flush_function = params->flush_function;
- pool->flush_arg = params->flush_arg;
-
- INIT_LIST_HEAD(&pool->free_list);
- INIT_LIST_HEAD(&pool->dirty_list);
-
- if (params->cache) {
- pool->cache_bucket =
- kmalloc_array(IB_FMR_HASH_SIZE,
- sizeof(*pool->cache_bucket),
- GFP_KERNEL);
- if (!pool->cache_bucket) {
- ret = -ENOMEM;
- goto out_free_pool;
- }
-
- for (i = 0; i < IB_FMR_HASH_SIZE; ++i)
- INIT_HLIST_HEAD(pool->cache_bucket + i);
- }
-
- pool->pool_size = 0;
- pool->max_pages = params->max_pages_per_fmr;
- pool->max_remaps = max_remaps;
- pool->dirty_watermark = params->dirty_watermark;
- pool->dirty_len = 0;
- spin_lock_init(&pool->pool_lock);
- atomic_set(&pool->req_ser, 0);
- atomic_set(&pool->flush_ser, 0);
- init_waitqueue_head(&pool->force_wait);
-
- pool->worker =
- kthread_create_worker(0, "ib_fmr(%s)", dev_name(&device->dev));
- if (IS_ERR(pool->worker)) {
- pr_warn(PFX "couldn't start cleanup kthread worker\n");
- ret = PTR_ERR(pool->worker);
- goto out_free_pool;
- }
- kthread_init_work(&pool->work, ib_fmr_cleanup_func);
-
- {
- struct ib_pool_fmr *fmr;
- struct ib_fmr_attr fmr_attr = {
- .max_pages = params->max_pages_per_fmr,
- .max_maps = pool->max_remaps,
- .page_shift = params->page_shift
- };
- int bytes_per_fmr = sizeof *fmr;
-
- if (pool->cache_bucket)
- bytes_per_fmr += params->max_pages_per_fmr * sizeof (u64);
-
- for (i = 0; i < params->pool_size; ++i) {
- fmr = kmalloc(bytes_per_fmr, GFP_KERNEL);
- if (!fmr)
- goto out_fail;
-
- fmr->pool = pool;
- fmr->remap_count = 0;
- fmr->ref_count = 0;
- INIT_HLIST_NODE(&fmr->cache_node);
-
- fmr->fmr = ib_alloc_fmr(pd, params->access, &fmr_attr);
- if (IS_ERR(fmr->fmr)) {
- pr_warn(PFX "fmr_create failed for FMR %d\n",
- i);
- kfree(fmr);
- goto out_fail;
- }
-
- list_add_tail(&fmr->list, &pool->free_list);
- ++pool->pool_size;
- }
- }
-
- return pool;
-
- out_free_pool:
- kfree(pool->cache_bucket);
- kfree(pool);
-
- return ERR_PTR(ret);
-
- out_fail:
- ib_destroy_fmr_pool(pool);
-
- return ERR_PTR(-ENOMEM);
-}
-EXPORT_SYMBOL(ib_create_fmr_pool);
-
-/**
- * ib_destroy_fmr_pool - Free FMR pool
- * @pool:FMR pool to free
- *
- * Destroy an FMR pool and free all associated resources.
- */
-void ib_destroy_fmr_pool(struct ib_fmr_pool *pool)
-{
- struct ib_pool_fmr *fmr;
- struct ib_pool_fmr *tmp;
- LIST_HEAD(fmr_list);
- int i;
-
- kthread_destroy_worker(pool->worker);
- ib_fmr_batch_release(pool);
-
- i = 0;
- list_for_each_entry_safe(fmr, tmp, &pool->free_list, list) {
- if (fmr->remap_count) {
- INIT_LIST_HEAD(&fmr_list);
- list_add_tail(&fmr->fmr->list, &fmr_list);
- ib_unmap_fmr(&fmr_list);
- }
- ib_dealloc_fmr(fmr->fmr);
- list_del(&fmr->list);
- kfree(fmr);
- ++i;
- }
-
- if (i < pool->pool_size)
- pr_warn(PFX "pool still has %d regions registered\n",
- pool->pool_size - i);
-
- kfree(pool->cache_bucket);
- kfree(pool);
-}
-EXPORT_SYMBOL(ib_destroy_fmr_pool);
-
-/**
- * ib_flush_fmr_pool - Invalidate all unmapped FMRs
- * @pool:FMR pool to flush
- *
- * Ensure that all unmapped FMRs are fully invalidated.
- */
-int ib_flush_fmr_pool(struct ib_fmr_pool *pool)
-{
- int serial;
- struct ib_pool_fmr *fmr, *next;
-
- /*
- * The free_list holds FMRs that may have been used
- * but have not been remapped enough times to be dirty.
- * Put them on the dirty list now so that the cleanup
- * thread will reap them too.
- */
- spin_lock_irq(&pool->pool_lock);
- list_for_each_entry_safe(fmr, next, &pool->free_list, list) {
- if (fmr->remap_count > 0)
- list_move(&fmr->list, &pool->dirty_list);
- }
- spin_unlock_irq(&pool->pool_lock);
-
- serial = atomic_inc_return(&pool->req_ser);
- kthread_queue_work(pool->worker, &pool->work);
-
- if (wait_event_interruptible(pool->force_wait,
- atomic_read(&pool->flush_ser) - serial >= 0))
- return -EINTR;
-
- return 0;
-}
-EXPORT_SYMBOL(ib_flush_fmr_pool);
-
-/**
- * ib_fmr_pool_map_phys - Map an FMR from an FMR pool.
- * @pool_handle: FMR pool to allocate FMR from
- * @page_list: List of pages to map
- * @list_len: Number of pages in @page_list
- * @io_virtual_address: I/O virtual address for new FMR
- */
-struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
- u64 *page_list,
- int list_len,
- u64 io_virtual_address)
-{
- struct ib_fmr_pool *pool = pool_handle;
- struct ib_pool_fmr *fmr;
- unsigned long flags;
- int result;
-
- if (list_len < 1 || list_len > pool->max_pages)
- return ERR_PTR(-EINVAL);
-
- spin_lock_irqsave(&pool->pool_lock, flags);
- fmr = ib_fmr_cache_lookup(pool,
- page_list,
- list_len,
- io_virtual_address);
- if (fmr) {
- /* found in cache */
- ++fmr->ref_count;
- if (fmr->ref_count == 1) {
- list_del(&fmr->list);
- }
-
- spin_unlock_irqrestore(&pool->pool_lock, flags);
-
- return fmr;
- }
-
- if (list_empty(&pool->free_list)) {
- spin_unlock_irqrestore(&pool->pool_lock, flags);
- return ERR_PTR(-EAGAIN);
- }
-
- fmr = list_entry(pool->free_list.next, struct ib_pool_fmr, list);
- list_del(&fmr->list);
- hlist_del_init(&fmr->cache_node);
- spin_unlock_irqrestore(&pool->pool_lock, flags);
-
- result = ib_map_phys_fmr(fmr->fmr, page_list, list_len,
- io_virtual_address);
-
- if (result) {
- spin_lock_irqsave(&pool->pool_lock, flags);
- list_add(&fmr->list, &pool->free_list);
- spin_unlock_irqrestore(&pool->pool_lock, flags);
-
- pr_warn(PFX "fmr_map returns %d\n", result);
-
- return ERR_PTR(result);
- }
-
- ++fmr->remap_count;
- fmr->ref_count = 1;
-
- if (pool->cache_bucket) {
- fmr->io_virtual_address = io_virtual_address;
- fmr->page_list_len = list_len;
- memcpy(fmr->page_list, page_list, list_len * sizeof(*page_list));
-
- spin_lock_irqsave(&pool->pool_lock, flags);
- hlist_add_head(&fmr->cache_node,
- pool->cache_bucket + ib_fmr_hash(fmr->page_list[0]));
- spin_unlock_irqrestore(&pool->pool_lock, flags);
- }
-
- return fmr;
-}
-EXPORT_SYMBOL(ib_fmr_pool_map_phys);
-
-/**
- * ib_fmr_pool_unmap - Unmap FMR
- * @fmr:FMR to unmap
- *
- * Unmap an FMR. The FMR mapping may remain valid until the FMR is
- * reused (or until ib_flush_fmr_pool() is called).
- */
-void ib_fmr_pool_unmap(struct ib_pool_fmr *fmr)
-{
- struct ib_fmr_pool *pool;
- unsigned long flags;
-
- pool = fmr->pool;
-
- spin_lock_irqsave(&pool->pool_lock, flags);
-
- --fmr->ref_count;
- if (!fmr->ref_count) {
- if (fmr->remap_count < pool->max_remaps) {
- list_add_tail(&fmr->list, &pool->free_list);
- } else {
- list_add_tail(&fmr->list, &pool->dirty_list);
- if (++pool->dirty_len >= pool->dirty_watermark) {
- atomic_inc(&pool->req_ser);
- kthread_queue_work(pool->worker, &pool->work);
- }
- }
- }
-
- spin_unlock_irqrestore(&pool->pool_lock, flags);
-}
-EXPORT_SYMBOL(ib_fmr_pool_unmap);
+++ /dev/null
-/*
- * Copyright (c) 2004 Topspin Corporation. All rights reserved.
- * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
- *
- * This software is available to you under a choice of one of two
- * licenses. You may choose to be licensed under the terms of the GNU
- * General Public License (GPL) Version 2, available from the file
- * COPYING in the main directory of this source tree, or the
- * OpenIB.org BSD license below:
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above
- * copyright notice, this list of conditions and the following
- * disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials
- * provided with the distribution.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#if !defined(IB_FMR_POOL_H)
-#define IB_FMR_POOL_H
-
-#include <rdma/ib_verbs.h>
-
-struct ib_fmr_pool;
-
-/**
- * struct ib_fmr_pool_param - Parameters for creating FMR pool
- * @max_pages_per_fmr:Maximum number of pages per map request.
- * @page_shift: Log2 of sizeof "pages" mapped by this fmr
- * @access:Access flags for FMRs in pool.
- * @pool_size:Number of FMRs to allocate for pool.
- * @dirty_watermark:Flush is triggered when @dirty_watermark dirty
- * FMRs are present.
- * @flush_function:Callback called when unmapped FMRs are flushed and
- * more FMRs are possibly available for mapping
- * @flush_arg:Context passed to user's flush function.
- * @cache:If set, FMRs may be reused after unmapping for identical map
- * requests.
- */
-struct ib_fmr_pool_param {
- int max_pages_per_fmr;
- int page_shift;
- enum ib_access_flags access;
- int pool_size;
- int dirty_watermark;
- void (*flush_function)(struct ib_fmr_pool *pool,
- void *arg);
- void *flush_arg;
- unsigned cache:1;
-};
-
-struct ib_pool_fmr {
- struct ib_fmr *fmr;
- struct ib_fmr_pool *pool;
- struct list_head list;
- struct hlist_node cache_node;
- int ref_count;
- int remap_count;
- u64 io_virtual_address;
- int page_list_len;
- u64 page_list[];
-};
-
-struct ib_fmr_pool *ib_create_fmr_pool(struct ib_pd *pd,
- struct ib_fmr_pool_param *params);
-
-void ib_destroy_fmr_pool(struct ib_fmr_pool *pool);
-
-int ib_flush_fmr_pool(struct ib_fmr_pool *pool);
-
-struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
- u64 *page_list,
- int list_len,
- u64 io_virtual_address);
-
-void ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);
-
-#endif /* IB_FMR_POOL_H */
projects / linux-2.6-microblaze.git / commitdiff