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- /*
- * Copyright (c) 2006 Oracle. 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/kernel.h>
- #include <linux/slab.h>
- #include <linux/rculist.h>
- #include <linux/llist.h>
- #include "rds.h"
- #include "ib.h"
- static DEFINE_PER_CPU(unsigned long, clean_list_grace);
- #define CLEAN_LIST_BUSY_BIT 0
- /*
- * This is stored as mr->r_trans_private.
- */
- struct rds_ib_mr {
- struct rds_ib_device *device;
- struct rds_ib_mr_pool *pool;
- struct ib_fmr *fmr;
- struct llist_node llnode;
- /* unmap_list is for freeing */
- struct list_head unmap_list;
- unsigned int remap_count;
- struct scatterlist *sg;
- unsigned int sg_len;
- u64 *dma;
- int sg_dma_len;
- };
- /*
- * Our own little FMR pool
- */
- struct rds_ib_mr_pool {
- unsigned int pool_type;
- struct mutex flush_lock; /* serialize fmr invalidate */
- struct delayed_work flush_worker; /* flush worker */
- atomic_t item_count; /* total # of MRs */
- atomic_t dirty_count; /* # dirty of MRs */
- struct llist_head drop_list; /* MRs that have reached their max_maps limit */
- struct llist_head free_list; /* unused MRs */
- struct llist_head clean_list; /* global unused & unamapped MRs */
- wait_queue_head_t flush_wait;
- atomic_t free_pinned; /* memory pinned by free MRs */
- unsigned long max_items;
- unsigned long max_items_soft;
- unsigned long max_free_pinned;
- struct ib_fmr_attr fmr_attr;
- };
- static struct workqueue_struct *rds_ib_fmr_wq;
- int rds_ib_fmr_init(void)
- {
- rds_ib_fmr_wq = create_workqueue("rds_fmr_flushd");
- if (!rds_ib_fmr_wq)
- return -ENOMEM;
- return 0;
- }
- /* By the time this is called all the IB devices should have been torn down and
- * had their pools freed. As each pool is freed its work struct is waited on,
- * so the pool flushing work queue should be idle by the time we get here.
- */
- void rds_ib_fmr_exit(void)
- {
- destroy_workqueue(rds_ib_fmr_wq);
- }
- static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all, struct rds_ib_mr **);
- static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr);
- static void rds_ib_mr_pool_flush_worker(struct work_struct *work);
- static struct rds_ib_device *rds_ib_get_device(__be32 ipaddr)
- {
- struct rds_ib_device *rds_ibdev;
- struct rds_ib_ipaddr *i_ipaddr;
- rcu_read_lock();
- list_for_each_entry_rcu(rds_ibdev, &rds_ib_devices, list) {
- list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) {
- if (i_ipaddr->ipaddr == ipaddr) {
- atomic_inc(&rds_ibdev->refcount);
- rcu_read_unlock();
- return rds_ibdev;
- }
- }
- }
- rcu_read_unlock();
- return NULL;
- }
- static int rds_ib_add_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
- {
- struct rds_ib_ipaddr *i_ipaddr;
- i_ipaddr = kmalloc(sizeof *i_ipaddr, GFP_KERNEL);
- if (!i_ipaddr)
- return -ENOMEM;
- i_ipaddr->ipaddr = ipaddr;
- spin_lock_irq(&rds_ibdev->spinlock);
- list_add_tail_rcu(&i_ipaddr->list, &rds_ibdev->ipaddr_list);
- spin_unlock_irq(&rds_ibdev->spinlock);
- return 0;
- }
- static void rds_ib_remove_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
- {
- struct rds_ib_ipaddr *i_ipaddr;
- struct rds_ib_ipaddr *to_free = NULL;
- spin_lock_irq(&rds_ibdev->spinlock);
- list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) {
- if (i_ipaddr->ipaddr == ipaddr) {
- list_del_rcu(&i_ipaddr->list);
- to_free = i_ipaddr;
- break;
- }
- }
- spin_unlock_irq(&rds_ibdev->spinlock);
- if (to_free)
- kfree_rcu(to_free, rcu);
- }
- int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr)
- {
- struct rds_ib_device *rds_ibdev_old;
- rds_ibdev_old = rds_ib_get_device(ipaddr);
- if (!rds_ibdev_old)
- return rds_ib_add_ipaddr(rds_ibdev, ipaddr);
- if (rds_ibdev_old != rds_ibdev) {
- rds_ib_remove_ipaddr(rds_ibdev_old, ipaddr);
- rds_ib_dev_put(rds_ibdev_old);
- return rds_ib_add_ipaddr(rds_ibdev, ipaddr);
- }
- rds_ib_dev_put(rds_ibdev_old);
- return 0;
- }
- void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn)
- {
- struct rds_ib_connection *ic = conn->c_transport_data;
- /* conn was previously on the nodev_conns_list */
- spin_lock_irq(&ib_nodev_conns_lock);
- BUG_ON(list_empty(&ib_nodev_conns));
- BUG_ON(list_empty(&ic->ib_node));
- list_del(&ic->ib_node);
- spin_lock(&rds_ibdev->spinlock);
- list_add_tail(&ic->ib_node, &rds_ibdev->conn_list);
- spin_unlock(&rds_ibdev->spinlock);
- spin_unlock_irq(&ib_nodev_conns_lock);
- ic->rds_ibdev = rds_ibdev;
- atomic_inc(&rds_ibdev->refcount);
- }
- void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn)
- {
- struct rds_ib_connection *ic = conn->c_transport_data;
- /* place conn on nodev_conns_list */
- spin_lock(&ib_nodev_conns_lock);
- spin_lock_irq(&rds_ibdev->spinlock);
- BUG_ON(list_empty(&ic->ib_node));
- list_del(&ic->ib_node);
- spin_unlock_irq(&rds_ibdev->spinlock);
- list_add_tail(&ic->ib_node, &ib_nodev_conns);
- spin_unlock(&ib_nodev_conns_lock);
- ic->rds_ibdev = NULL;
- rds_ib_dev_put(rds_ibdev);
- }
- void rds_ib_destroy_nodev_conns(void)
- {
- struct rds_ib_connection *ic, *_ic;
- LIST_HEAD(tmp_list);
- /* avoid calling conn_destroy with irqs off */
- spin_lock_irq(&ib_nodev_conns_lock);
- list_splice(&ib_nodev_conns, &tmp_list);
- spin_unlock_irq(&ib_nodev_conns_lock);
- list_for_each_entry_safe(ic, _ic, &tmp_list, ib_node)
- rds_conn_destroy(ic->conn);
- }
- struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev,
- int pool_type)
- {
- struct rds_ib_mr_pool *pool;
- pool = kzalloc(sizeof(*pool), GFP_KERNEL);
- if (!pool)
- return ERR_PTR(-ENOMEM);
- pool->pool_type = pool_type;
- init_llist_head(&pool->free_list);
- init_llist_head(&pool->drop_list);
- init_llist_head(&pool->clean_list);
- mutex_init(&pool->flush_lock);
- init_waitqueue_head(&pool->flush_wait);
- INIT_DELAYED_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker);
- if (pool_type == RDS_IB_MR_1M_POOL) {
- /* +1 allows for unaligned MRs */
- pool->fmr_attr.max_pages = RDS_FMR_1M_MSG_SIZE + 1;
- pool->max_items = RDS_FMR_1M_POOL_SIZE;
- } else {
- /* pool_type == RDS_IB_MR_8K_POOL */
- pool->fmr_attr.max_pages = RDS_FMR_8K_MSG_SIZE + 1;
- pool->max_items = RDS_FMR_8K_POOL_SIZE;
- }
- pool->max_free_pinned = pool->max_items * pool->fmr_attr.max_pages / 4;
- pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps;
- pool->fmr_attr.page_shift = PAGE_SHIFT;
- pool->max_items_soft = rds_ibdev->max_fmrs * 3 / 4;
- return pool;
- }
- void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo)
- {
- struct rds_ib_mr_pool *pool_1m = rds_ibdev->mr_1m_pool;
- iinfo->rdma_mr_max = pool_1m->max_items;
- iinfo->rdma_mr_size = pool_1m->fmr_attr.max_pages;
- }
- void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool)
- {
- cancel_delayed_work_sync(&pool->flush_worker);
- rds_ib_flush_mr_pool(pool, 1, NULL);
- WARN_ON(atomic_read(&pool->item_count));
- WARN_ON(atomic_read(&pool->free_pinned));
- kfree(pool);
- }
- static inline struct rds_ib_mr *rds_ib_reuse_fmr(struct rds_ib_mr_pool *pool)
- {
- struct rds_ib_mr *ibmr = NULL;
- struct llist_node *ret;
- unsigned long *flag;
- preempt_disable();
- flag = this_cpu_ptr(&clean_list_grace);
- set_bit(CLEAN_LIST_BUSY_BIT, flag);
- ret = llist_del_first(&pool->clean_list);
- if (ret)
- ibmr = llist_entry(ret, struct rds_ib_mr, llnode);
- clear_bit(CLEAN_LIST_BUSY_BIT, flag);
- preempt_enable();
- return ibmr;
- }
- static inline void wait_clean_list_grace(void)
- {
- int cpu;
- unsigned long *flag;
- for_each_online_cpu(cpu) {
- flag = &per_cpu(clean_list_grace, cpu);
- while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
- cpu_relax();
- }
- }
- static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev,
- int npages)
- {
- struct rds_ib_mr_pool *pool;
- struct rds_ib_mr *ibmr = NULL;
- int err = 0, iter = 0;
- if (npages <= RDS_FMR_8K_MSG_SIZE)
- pool = rds_ibdev->mr_8k_pool;
- else
- pool = rds_ibdev->mr_1m_pool;
- if (atomic_read(&pool->dirty_count) >= pool->max_items / 10)
- queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10);
- /* Switch pools if one of the pool is reaching upper limit */
- if (atomic_read(&pool->dirty_count) >= pool->max_items * 9 / 10) {
- if (pool->pool_type == RDS_IB_MR_8K_POOL)
- pool = rds_ibdev->mr_1m_pool;
- else
- pool = rds_ibdev->mr_8k_pool;
- }
- while (1) {
- ibmr = rds_ib_reuse_fmr(pool);
- if (ibmr)
- return ibmr;
- /* No clean MRs - now we have the choice of either
- * allocating a fresh MR up to the limit imposed by the
- * driver, or flush any dirty unused MRs.
- * We try to avoid stalling in the send path if possible,
- * so we allocate as long as we're allowed to.
- *
- * We're fussy with enforcing the FMR limit, though. If the driver
- * tells us we can't use more than N fmrs, we shouldn't start
- * arguing with it */
- if (atomic_inc_return(&pool->item_count) <= pool->max_items)
- break;
- atomic_dec(&pool->item_count);
- if (++iter > 2) {
- if (pool->pool_type == RDS_IB_MR_8K_POOL)
- rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_depleted);
- else
- rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_depleted);
- return ERR_PTR(-EAGAIN);
- }
- /* We do have some empty MRs. Flush them out. */
- if (pool->pool_type == RDS_IB_MR_8K_POOL)
- rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_wait);
- else
- rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_wait);
- rds_ib_flush_mr_pool(pool, 0, &ibmr);
- if (ibmr)
- return ibmr;
- }
- ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, rdsibdev_to_node(rds_ibdev));
- if (!ibmr) {
- err = -ENOMEM;
- goto out_no_cigar;
- }
- ibmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
- (IB_ACCESS_LOCAL_WRITE |
- IB_ACCESS_REMOTE_READ |
- IB_ACCESS_REMOTE_WRITE|
- IB_ACCESS_REMOTE_ATOMIC),
- &pool->fmr_attr);
- if (IS_ERR(ibmr->fmr)) {
- err = PTR_ERR(ibmr->fmr);
- ibmr->fmr = NULL;
- printk(KERN_WARNING "RDS/IB: ib_alloc_fmr failed (err=%d)\n", err);
- goto out_no_cigar;
- }
- ibmr->pool = pool;
- if (pool->pool_type == RDS_IB_MR_8K_POOL)
- rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc);
- else
- rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc);
- return ibmr;
- out_no_cigar:
- if (ibmr) {
- if (ibmr->fmr)
- ib_dealloc_fmr(ibmr->fmr);
- kfree(ibmr);
- }
- atomic_dec(&pool->item_count);
- return ERR_PTR(err);
- }
- static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev, struct rds_ib_mr *ibmr,
- struct scatterlist *sg, unsigned int nents)
- {
- struct ib_device *dev = rds_ibdev->dev;
- struct scatterlist *scat = sg;
- u64 io_addr = 0;
- u64 *dma_pages;
- u32 len;
- int page_cnt, sg_dma_len;
- int i, j;
- int ret;
- sg_dma_len = ib_dma_map_sg(dev, sg, nents,
- DMA_BIDIRECTIONAL);
- if (unlikely(!sg_dma_len)) {
- printk(KERN_WARNING "RDS/IB: dma_map_sg failed!\n");
- return -EBUSY;
- }
- len = 0;
- page_cnt = 0;
- for (i = 0; i < sg_dma_len; ++i) {
- unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
- u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
- if (dma_addr & ~PAGE_MASK) {
- if (i > 0)
- return -EINVAL;
- else
- ++page_cnt;
- }
- if ((dma_addr + dma_len) & ~PAGE_MASK) {
- if (i < sg_dma_len - 1)
- return -EINVAL;
- else
- ++page_cnt;
- }
- len += dma_len;
- }
- page_cnt += len >> PAGE_SHIFT;
- if (page_cnt > ibmr->pool->fmr_attr.max_pages)
- return -EINVAL;
- dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC,
- rdsibdev_to_node(rds_ibdev));
- if (!dma_pages)
- return -ENOMEM;
- page_cnt = 0;
- for (i = 0; i < sg_dma_len; ++i) {
- unsigned int dma_len = ib_sg_dma_len(dev, &scat[i]);
- u64 dma_addr = ib_sg_dma_address(dev, &scat[i]);
- for (j = 0; j < dma_len; j += PAGE_SIZE)
- dma_pages[page_cnt++] =
- (dma_addr & PAGE_MASK) + j;
- }
- ret = ib_map_phys_fmr(ibmr->fmr,
- dma_pages, page_cnt, io_addr);
- if (ret)
- goto out;
- /* Success - we successfully remapped the MR, so we can
- * safely tear down the old mapping. */
- rds_ib_teardown_mr(ibmr);
- ibmr->sg = scat;
- ibmr->sg_len = nents;
- ibmr->sg_dma_len = sg_dma_len;
- ibmr->remap_count++;
- if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
- rds_ib_stats_inc(s_ib_rdma_mr_8k_used);
- else
- rds_ib_stats_inc(s_ib_rdma_mr_1m_used);
- ret = 0;
- out:
- kfree(dma_pages);
- return ret;
- }
- void rds_ib_sync_mr(void *trans_private, int direction)
- {
- struct rds_ib_mr *ibmr = trans_private;
- struct rds_ib_device *rds_ibdev = ibmr->device;
- switch (direction) {
- case DMA_FROM_DEVICE:
- ib_dma_sync_sg_for_cpu(rds_ibdev->dev, ibmr->sg,
- ibmr->sg_dma_len, DMA_BIDIRECTIONAL);
- break;
- case DMA_TO_DEVICE:
- ib_dma_sync_sg_for_device(rds_ibdev->dev, ibmr->sg,
- ibmr->sg_dma_len, DMA_BIDIRECTIONAL);
- break;
- }
- }
- static void __rds_ib_teardown_mr(struct rds_ib_mr *ibmr)
- {
- struct rds_ib_device *rds_ibdev = ibmr->device;
- if (ibmr->sg_dma_len) {
- ib_dma_unmap_sg(rds_ibdev->dev,
- ibmr->sg, ibmr->sg_len,
- DMA_BIDIRECTIONAL);
- ibmr->sg_dma_len = 0;
- }
- /* Release the s/g list */
- if (ibmr->sg_len) {
- unsigned int i;
- for (i = 0; i < ibmr->sg_len; ++i) {
- struct page *page = sg_page(&ibmr->sg[i]);
- /* FIXME we need a way to tell a r/w MR
- * from a r/o MR */
- WARN_ON(!page->mapping && irqs_disabled());
- set_page_dirty(page);
- put_page(page);
- }
- kfree(ibmr->sg);
- ibmr->sg = NULL;
- ibmr->sg_len = 0;
- }
- }
- static void rds_ib_teardown_mr(struct rds_ib_mr *ibmr)
- {
- unsigned int pinned = ibmr->sg_len;
- __rds_ib_teardown_mr(ibmr);
- if (pinned) {
- struct rds_ib_mr_pool *pool = ibmr->pool;
- atomic_sub(pinned, &pool->free_pinned);
- }
- }
- static inline unsigned int rds_ib_flush_goal(struct rds_ib_mr_pool *pool, int free_all)
- {
- unsigned int item_count;
- item_count = atomic_read(&pool->item_count);
- if (free_all)
- return item_count;
- return 0;
- }
- /*
- * given an llist of mrs, put them all into the list_head for more processing
- */
- static unsigned int llist_append_to_list(struct llist_head *llist,
- struct list_head *list)
- {
- struct rds_ib_mr *ibmr;
- struct llist_node *node;
- struct llist_node *next;
- unsigned int count = 0;
- node = llist_del_all(llist);
- while (node) {
- next = node->next;
- ibmr = llist_entry(node, struct rds_ib_mr, llnode);
- list_add_tail(&ibmr->unmap_list, list);
- node = next;
- count++;
- }
- return count;
- }
- /*
- * this takes a list head of mrs and turns it into linked llist nodes
- * of clusters. Each cluster has linked llist nodes of
- * MR_CLUSTER_SIZE mrs that are ready for reuse.
- */
- static void list_to_llist_nodes(struct rds_ib_mr_pool *pool,
- struct list_head *list,
- struct llist_node **nodes_head,
- struct llist_node **nodes_tail)
- {
- struct rds_ib_mr *ibmr;
- struct llist_node *cur = NULL;
- struct llist_node **next = nodes_head;
- list_for_each_entry(ibmr, list, unmap_list) {
- cur = &ibmr->llnode;
- *next = cur;
- next = &cur->next;
- }
- *next = NULL;
- *nodes_tail = cur;
- }
- /*
- * Flush our pool of MRs.
- * At a minimum, all currently unused MRs are unmapped.
- * If the number of MRs allocated exceeds the limit, we also try
- * to free as many MRs as needed to get back to this limit.
- */
- static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
- int free_all, struct rds_ib_mr **ibmr_ret)
- {
- struct rds_ib_mr *ibmr, *next;
- struct llist_node *clean_nodes;
- struct llist_node *clean_tail;
- LIST_HEAD(unmap_list);
- LIST_HEAD(fmr_list);
- unsigned long unpinned = 0;
- unsigned int nfreed = 0, dirty_to_clean = 0, free_goal;
- int ret = 0;
- if (pool->pool_type == RDS_IB_MR_8K_POOL)
- rds_ib_stats_inc(s_ib_rdma_mr_8k_pool_flush);
- else
- rds_ib_stats_inc(s_ib_rdma_mr_1m_pool_flush);
- if (ibmr_ret) {
- DEFINE_WAIT(wait);
- while (!mutex_trylock(&pool->flush_lock)) {
- ibmr = rds_ib_reuse_fmr(pool);
- if (ibmr) {
- *ibmr_ret = ibmr;
- finish_wait(&pool->flush_wait, &wait);
- goto out_nolock;
- }
- prepare_to_wait(&pool->flush_wait, &wait,
- TASK_UNINTERRUPTIBLE);
- if (llist_empty(&pool->clean_list))
- schedule();
- ibmr = rds_ib_reuse_fmr(pool);
- if (ibmr) {
- *ibmr_ret = ibmr;
- finish_wait(&pool->flush_wait, &wait);
- goto out_nolock;
- }
- }
- finish_wait(&pool->flush_wait, &wait);
- } else
- mutex_lock(&pool->flush_lock);
- if (ibmr_ret) {
- ibmr = rds_ib_reuse_fmr(pool);
- if (ibmr) {
- *ibmr_ret = ibmr;
- goto out;
- }
- }
- /* Get the list of all MRs to be dropped. Ordering matters -
- * we want to put drop_list ahead of free_list.
- */
- dirty_to_clean = llist_append_to_list(&pool->drop_list, &unmap_list);
- dirty_to_clean += llist_append_to_list(&pool->free_list, &unmap_list);
- if (free_all)
- llist_append_to_list(&pool->clean_list, &unmap_list);
- free_goal = rds_ib_flush_goal(pool, free_all);
- if (list_empty(&unmap_list))
- goto out;
- /* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
- list_for_each_entry(ibmr, &unmap_list, unmap_list)
- list_add(&ibmr->fmr->list, &fmr_list);
- ret = ib_unmap_fmr(&fmr_list);
- if (ret)
- printk(KERN_WARNING "RDS/IB: ib_unmap_fmr failed (err=%d)\n", ret);
- /* Now we can destroy the DMA mapping and unpin any pages */
- list_for_each_entry_safe(ibmr, next, &unmap_list, unmap_list) {
- unpinned += ibmr->sg_len;
- __rds_ib_teardown_mr(ibmr);
- if (nfreed < free_goal ||
- ibmr->remap_count >= pool->fmr_attr.max_maps) {
- if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
- rds_ib_stats_inc(s_ib_rdma_mr_8k_free);
- else
- rds_ib_stats_inc(s_ib_rdma_mr_1m_free);
- list_del(&ibmr->unmap_list);
- ib_dealloc_fmr(ibmr->fmr);
- kfree(ibmr);
- nfreed++;
- }
- }
- if (!list_empty(&unmap_list)) {
- /* we have to make sure that none of the things we're about
- * to put on the clean list would race with other cpus trying
- * to pull items off. The llist would explode if we managed to
- * remove something from the clean list and then add it back again
- * while another CPU was spinning on that same item in llist_del_first.
- *
- * This is pretty unlikely, but just in case wait for an llist grace period
- * here before adding anything back into the clean list.
- */
- wait_clean_list_grace();
- list_to_llist_nodes(pool, &unmap_list, &clean_nodes, &clean_tail);
- if (ibmr_ret)
- *ibmr_ret = llist_entry(clean_nodes, struct rds_ib_mr, llnode);
- /* more than one entry in llist nodes */
- if (clean_nodes->next)
- llist_add_batch(clean_nodes->next, clean_tail, &pool->clean_list);
- }
- atomic_sub(unpinned, &pool->free_pinned);
- atomic_sub(dirty_to_clean, &pool->dirty_count);
- atomic_sub(nfreed, &pool->item_count);
- out:
- mutex_unlock(&pool->flush_lock);
- if (waitqueue_active(&pool->flush_wait))
- wake_up(&pool->flush_wait);
- out_nolock:
- return ret;
- }
- static void rds_ib_mr_pool_flush_worker(struct work_struct *work)
- {
- struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker.work);
- rds_ib_flush_mr_pool(pool, 0, NULL);
- }
- void rds_ib_free_mr(void *trans_private, int invalidate)
- {
- struct rds_ib_mr *ibmr = trans_private;
- struct rds_ib_mr_pool *pool = ibmr->pool;
- struct rds_ib_device *rds_ibdev = ibmr->device;
- rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len);
- /* Return it to the pool's free list */
- if (ibmr->remap_count >= pool->fmr_attr.max_maps)
- llist_add(&ibmr->llnode, &pool->drop_list);
- else
- llist_add(&ibmr->llnode, &pool->free_list);
- atomic_add(ibmr->sg_len, &pool->free_pinned);
- atomic_inc(&pool->dirty_count);
- /* If we've pinned too many pages, request a flush */
- if (atomic_read(&pool->free_pinned) >= pool->max_free_pinned ||
- atomic_read(&pool->dirty_count) >= pool->max_items / 5)
- queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10);
- if (invalidate) {
- if (likely(!in_interrupt())) {
- rds_ib_flush_mr_pool(pool, 0, NULL);
- } else {
- /* We get here if the user created a MR marked
- * as use_once and invalidate at the same time.
- */
- queue_delayed_work(rds_ib_fmr_wq,
- &pool->flush_worker, 10);
- }
- }
- rds_ib_dev_put(rds_ibdev);
- }
- void rds_ib_flush_mrs(void)
- {
- struct rds_ib_device *rds_ibdev;
- down_read(&rds_ib_devices_lock);
- list_for_each_entry(rds_ibdev, &rds_ib_devices, list) {
- if (rds_ibdev->mr_8k_pool)
- rds_ib_flush_mr_pool(rds_ibdev->mr_8k_pool, 0, NULL);
- if (rds_ibdev->mr_1m_pool)
- rds_ib_flush_mr_pool(rds_ibdev->mr_1m_pool, 0, NULL);
- }
- up_read(&rds_ib_devices_lock);
- }
- void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
- struct rds_sock *rs, u32 *key_ret)
- {
- struct rds_ib_device *rds_ibdev;
- struct rds_ib_mr *ibmr = NULL;
- int ret;
- rds_ibdev = rds_ib_get_device(rs->rs_bound_addr);
- if (!rds_ibdev) {
- ret = -ENODEV;
- goto out;
- }
- if (!rds_ibdev->mr_8k_pool || !rds_ibdev->mr_1m_pool) {
- ret = -ENODEV;
- goto out;
- }
- ibmr = rds_ib_alloc_fmr(rds_ibdev, nents);
- if (IS_ERR(ibmr)) {
- rds_ib_dev_put(rds_ibdev);
- return ibmr;
- }
- ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
- if (ret == 0)
- *key_ret = ibmr->fmr->rkey;
- else
- printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret);
- ibmr->device = rds_ibdev;
- rds_ibdev = NULL;
- out:
- if (ret) {
- if (ibmr)
- rds_ib_free_mr(ibmr, 0);
- ibmr = ERR_PTR(ret);
- }
- if (rds_ibdev)
- rds_ib_dev_put(rds_ibdev);
- return ibmr;
- }
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