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IB/mlx5: Resolve soft lock on massive reg MRs

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When calling reg_mr of large MRs (e.g. 4GB) from multiple processes
and MR caches can't supply the required amount of MRs the slow-path
of MR allocation may be used. In this case we need to serialize the
slow-path between the processes to avoid soft lock.

Fixes: e126ba97db ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Moshe Lazer <moshel@mellanox.com>
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Moshe Lazer
2016-10-27 16:36:42 +03:00
committed by Doug Ledford
parent 16b0e0695a
commit 6bc1a656ab
2 changed files with 7 additions and 1 deletions
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6
drivers/infiniband/hw/mlx5/mr.c
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@@ -610,6 +610,7 @@ int mlx5_mr_cache_init(struct mlx5_ib_dev *dev)
int err;
int i;
mutex_init(&dev->slow_path_mutex);
cache->wq = alloc_ordered_workqueue("mkey_cache", WQ_MEM_RECLAIM);
if (!cache->wq) {
mlx5_ib_warn(dev, "failed to create work queue\n");
@@ -1182,9 +1183,12 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
goto error;
}
if (!mr)
if (!mr) {
mutex_lock(&dev->slow_path_mutex);
mr = reg_create(NULL, pd, virt_addr, length, umem, ncont,
page_shift, access_flags);
mutex_unlock(&dev->slow_path_mutex);
}
if (IS_ERR(mr)) {
err = PTR_ERR(mr);