*/
#include <linux/kernel.h>
#include <linux/slab.h>
+#include <linux/rculist.h>
#include "rds.h"
#include "ib.h"
+#include "xlist.h"
+static struct workqueue_struct *rds_ib_fmr_wq;
+
+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_device *device;
struct rds_ib_mr_pool *pool;
struct ib_fmr *fmr;
- struct list_head list;
+
+ struct xlist_head xlist;
+
+ /* unmap_list is for freeing */
+ struct list_head unmap_list;
unsigned int remap_count;
struct scatterlist *sg;
*/
struct rds_ib_mr_pool {
struct mutex flush_lock; /* serialize fmr invalidate */
- struct work_struct flush_worker; /* flush worker */
+ struct delayed_work flush_worker; /* flush worker */
- spinlock_t list_lock; /* protect variables below */
atomic_t item_count; /* total # of MRs */
atomic_t dirty_count; /* # dirty of MRs */
- struct list_head drop_list; /* MRs that have reached their max_maps limit */
- struct list_head free_list; /* unused MRs */
- struct list_head clean_list; /* unused & unamapped MRs */
+
+ struct xlist_head drop_list; /* MRs that have reached their max_maps limit */
+ struct xlist_head free_list; /* unused MRs */
+ struct xlist_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;
struct ib_fmr_attr fmr_attr;
};
-static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool, int free_all);
+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);
struct rds_ib_device *rds_ibdev;
struct rds_ib_ipaddr *i_ipaddr;
- list_for_each_entry(rds_ibdev, &rds_ib_devices, list) {
- spin_lock_irq(&rds_ibdev->spinlock);
- list_for_each_entry(i_ipaddr, &rds_ibdev->ipaddr_list, list) {
+ 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) {
- spin_unlock_irq(&rds_ibdev->spinlock);
+ atomic_inc(&rds_ibdev->refcount);
+ rcu_read_unlock();
return rds_ibdev;
}
}
- spin_unlock_irq(&rds_ibdev->spinlock);
}
+ rcu_read_unlock();
return NULL;
}
i_ipaddr->ipaddr = ipaddr;
spin_lock_irq(&rds_ibdev->spinlock);
- list_add_tail(&i_ipaddr->list, &rds_ibdev->ipaddr_list);
+ 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, *next;
+ struct rds_ib_ipaddr *i_ipaddr;
+ struct rds_ib_ipaddr *to_free = NULL;
+
spin_lock_irq(&rds_ibdev->spinlock);
- list_for_each_entry_safe(i_ipaddr, next, &rds_ibdev->ipaddr_list, list) {
+ list_for_each_entry_rcu(i_ipaddr, &rds_ibdev->ipaddr_list, list) {
if (i_ipaddr->ipaddr == ipaddr) {
- list_del(&i_ipaddr->list);
- kfree(i_ipaddr);
+ list_del_rcu(&i_ipaddr->list);
+ to_free = i_ipaddr;
break;
}
}
spin_unlock_irq(&rds_ibdev->spinlock);
+
+ if (to_free) {
+ synchronize_rcu();
+ kfree(to_free);
+ }
}
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)
+ if (rds_ibdev_old) {
rds_ib_remove_ipaddr(rds_ibdev_old, ipaddr);
+ rds_ib_dev_put(rds_ibdev_old);
+ }
return rds_ib_add_ipaddr(rds_ibdev, ipaddr);
}
BUG_ON(list_empty(&ic->ib_node));
list_del(&ic->ib_node);
- spin_lock_irq(&rds_ibdev->spinlock);
+ spin_lock(&rds_ibdev->spinlock);
list_add_tail(&ic->ib_node, &rds_ibdev->conn_list);
- spin_unlock_irq(&rds_ibdev->spinlock);
+ 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)
spin_unlock(&ib_nodev_conns_lock);
ic->rds_ibdev = NULL;
+ rds_ib_dev_put(rds_ibdev);
}
-void __rds_ib_destroy_conns(struct list_head *list, spinlock_t *list_lock)
+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(list_lock);
- list_splice(list, &tmp_list);
- INIT_LIST_HEAD(list);
- spin_unlock_irq(list_lock);
+ 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);
if (!pool)
return ERR_PTR(-ENOMEM);
- INIT_LIST_HEAD(&pool->free_list);
- INIT_LIST_HEAD(&pool->drop_list);
- INIT_LIST_HEAD(&pool->clean_list);
+ INIT_XLIST_HEAD(&pool->free_list);
+ INIT_XLIST_HEAD(&pool->drop_list);
+ INIT_XLIST_HEAD(&pool->clean_list);
mutex_init(&pool->flush_lock);
- spin_lock_init(&pool->list_lock);
- INIT_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker);
+ init_waitqueue_head(&pool->flush_wait);
+ INIT_DELAYED_WORK(&pool->flush_worker, rds_ib_mr_pool_flush_worker);
pool->fmr_attr.max_pages = fmr_message_size;
pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps;
void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool)
{
- flush_workqueue(rds_wq);
- rds_ib_flush_mr_pool(pool, 1);
+ 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 void refill_local(struct rds_ib_mr_pool *pool, struct xlist_head *xl,
+ struct rds_ib_mr **ibmr_ret)
+{
+ struct xlist_head *ibmr_xl;
+ ibmr_xl = xlist_del_head_fast(xl);
+ *ibmr_ret = list_entry(ibmr_xl, struct rds_ib_mr, xlist);
+}
+
static inline struct rds_ib_mr *rds_ib_reuse_fmr(struct rds_ib_mr_pool *pool)
{
struct rds_ib_mr *ibmr = NULL;
- unsigned long flags;
+ struct xlist_head *ret;
+ unsigned long *flag;
- spin_lock_irqsave(&pool->list_lock, flags);
- if (!list_empty(&pool->clean_list)) {
- ibmr = list_entry(pool->clean_list.next, struct rds_ib_mr, list);
- list_del_init(&ibmr->list);
- }
- spin_unlock_irqrestore(&pool->list_lock, flags);
+ preempt_disable();
+ flag = &__get_cpu_var(clean_list_grace);
+ set_bit(CLEAN_LIST_BUSY_BIT, flag);
+ ret = xlist_del_head(&pool->clean_list);
+ if (ret)
+ ibmr = list_entry(ret, struct rds_ib_mr, xlist);
+ 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)
{
struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
struct rds_ib_mr *ibmr = NULL;
int err = 0, iter = 0;
+ if (atomic_read(&pool->dirty_count) >= pool->max_items / 10)
+ queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10);
+
while (1) {
ibmr = rds_ib_reuse_fmr(pool);
if (ibmr)
/* We do have some empty MRs. Flush them out. */
rds_ib_stats_inc(s_ib_rdma_mr_pool_wait);
- rds_ib_flush_mr_pool(pool, 0);
+ rds_ib_flush_mr_pool(pool, 0, &ibmr);
+ if (ibmr)
+ return ibmr;
}
- ibmr = kzalloc(sizeof(*ibmr), GFP_KERNEL);
+ ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL, rdsibdev_to_node(rds_ibdev));
if (!ibmr) {
err = -ENOMEM;
goto out_no_cigar;
}
+ memset(ibmr, 0, sizeof(*ibmr));
+
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);
if (page_cnt > fmr_message_size)
return -EINVAL;
- dma_pages = kmalloc(sizeof(u64) * page_cnt, GFP_ATOMIC);
+ dma_pages = kmalloc_node(sizeof(u64) * page_cnt, GFP_ATOMIC,
+ rdsibdev_to_node(rds_ibdev));
if (!dma_pages)
return -ENOMEM;
return 0;
}
+/*
+ * given an xlist of mrs, put them all into the list_head for more processing
+ */
+static void xlist_append_to_list(struct xlist_head *xlist, struct list_head *list)
+{
+ struct rds_ib_mr *ibmr;
+ struct xlist_head splice;
+ struct xlist_head *cur;
+ struct xlist_head *next;
+
+ splice.next = NULL;
+ xlist_splice(xlist, &splice);
+ cur = splice.next;
+ while (cur) {
+ next = cur->next;
+ ibmr = list_entry(cur, struct rds_ib_mr, xlist);
+ list_add_tail(&ibmr->unmap_list, list);
+ cur = next;
+ }
+}
+
+/*
+ * this takes a list head of mrs and turns it into an xlist of clusters.
+ * each cluster has an xlist of MR_CLUSTER_SIZE mrs that are ready for
+ * reuse.
+ */
+static void list_append_to_xlist(struct rds_ib_mr_pool *pool,
+ struct list_head *list, struct xlist_head *xlist,
+ struct xlist_head **tail_ret)
+{
+ struct rds_ib_mr *ibmr;
+ struct xlist_head *cur_mr = xlist;
+ struct xlist_head *tail_mr = NULL;
+
+ list_for_each_entry(ibmr, list, unmap_list) {
+ tail_mr = &ibmr->xlist;
+ tail_mr->next = NULL;
+ cur_mr->next = tail_mr;
+ cur_mr = tail_mr;
+ }
+ *tail_ret = tail_mr;
+}
+
/*
* 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)
+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 xlist_head clean_xlist;
+ struct xlist_head *clean_tail;
LIST_HEAD(unmap_list);
LIST_HEAD(fmr_list);
unsigned long unpinned = 0;
- unsigned long flags;
unsigned int nfreed = 0, ncleaned = 0, free_goal;
int ret = 0;
rds_ib_stats_inc(s_ib_rdma_mr_pool_flush);
- mutex_lock(&pool->flush_lock);
+ 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 (xlist_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;
+ }
+ }
- spin_lock_irqsave(&pool->list_lock, flags);
/* Get the list of all MRs to be dropped. Ordering matters -
- * we want to put drop_list ahead of free_list. */
- list_splice_init(&pool->free_list, &unmap_list);
- list_splice_init(&pool->drop_list, &unmap_list);
+ * we want to put drop_list ahead of free_list.
+ */
+ xlist_append_to_list(&pool->drop_list, &unmap_list);
+ xlist_append_to_list(&pool->free_list, &unmap_list);
if (free_all)
- list_splice_init(&pool->clean_list, &unmap_list);
- spin_unlock_irqrestore(&pool->list_lock, flags);
+ xlist_append_to_list(&pool->clean_list, &unmap_list);
free_goal = rds_ib_flush_goal(pool, free_all);
goto out;
/* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
- list_for_each_entry(ibmr, &unmap_list, list)
+ 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, list) {
+ 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) {
rds_ib_stats_inc(s_ib_rdma_mr_free);
- list_del(&ibmr->list);
+ list_del(&ibmr->unmap_list);
ib_dealloc_fmr(ibmr->fmr);
kfree(ibmr);
nfreed++;
ncleaned++;
}
- spin_lock_irqsave(&pool->list_lock, flags);
- list_splice(&unmap_list, &pool->clean_list);
- spin_unlock_irqrestore(&pool->list_lock, flags);
+ 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 xlist 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 xlist_del_head.
+ *
+ * This is pretty unlikely, but just in case wait for an xlist grace period
+ * here before adding anything back into the clean list.
+ */
+ wait_clean_list_grace();
+
+ list_append_to_xlist(pool, &unmap_list, &clean_xlist, &clean_tail);
+ if (ibmr_ret)
+ refill_local(pool, &clean_xlist, ibmr_ret);
+
+ /* refill_local may have emptied our list */
+ if (!xlist_empty(&clean_xlist))
+ xlist_add(clean_xlist.next, clean_tail, &pool->clean_list);
+
+ }
atomic_sub(unpinned, &pool->free_pinned);
atomic_sub(ncleaned, &pool->dirty_count);
out:
mutex_unlock(&pool->flush_lock);
+ if (waitqueue_active(&pool->flush_wait))
+ wake_up(&pool->flush_wait);
+out_nolock:
return ret;
}
+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 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);
+ struct rds_ib_mr_pool *pool = container_of(work, struct rds_ib_mr_pool, flush_worker.work);
- rds_ib_flush_mr_pool(pool, 0);
+ 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_device *rds_ibdev = ibmr->device;
struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
- unsigned long flags;
rdsdebug("RDS/IB: free_mr nents %u\n", ibmr->sg_len);
/* Return it to the pool's free list */
- spin_lock_irqsave(&pool->list_lock, flags);
if (ibmr->remap_count >= pool->fmr_attr.max_maps)
- list_add(&ibmr->list, &pool->drop_list);
+ xlist_add(&ibmr->xlist, &ibmr->xlist, &pool->drop_list);
else
- list_add(&ibmr->list, &pool->free_list);
+ xlist_add(&ibmr->xlist, &ibmr->xlist, &pool->free_list);
atomic_add(ibmr->sg_len, &pool->free_pinned);
atomic_inc(&pool->dirty_count);
- spin_unlock_irqrestore(&pool->list_lock, flags);
/* 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 / 10)
- queue_work(rds_wq, &pool->flush_worker);
+ queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10);
if (invalidate) {
if (likely(!in_interrupt())) {
- rds_ib_flush_mr_pool(pool, 0);
+ 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_work(rds_wq, &pool->flush_worker);
+ 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) {
struct rds_ib_mr_pool *pool = rds_ibdev->mr_pool;
if (pool)
- rds_ib_flush_mr_pool(pool, 0);
+ rds_ib_flush_mr_pool(pool, 0, NULL);
}
+ up_read(&rds_ib_devices_lock);
}
void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
printk(KERN_WARNING "RDS/IB: map_fmr failed (errno=%d)\n", ret);
ibmr->device = rds_ibdev;
+ rds_ibdev = NULL;
out:
if (ret) {
rds_ib_free_mr(ibmr, 0);
ibmr = ERR_PTR(ret);
}
+ if (rds_ibdev)
+ rds_ib_dev_put(rds_ibdev);
return ibmr;
}
+
projects / karo-tx-linux.git / blobdiff