RDMA/mlx5: Put live in the correct place for ODP MRs

live is used to signal to the pagefault thread that the MR is initialized
and ready for use. It should be after the umem is assigned and all other
setup is completed. This prevents races (at least) of the form:

    CPU0                                     CPU1
mlx5_ib_alloc_implicit_mr()
 implicit_mr_alloc()
  live = 1
 imr->umem = umem
                                    num_pending_prefetch_inc()
                                      if (live)
				        atomic_inc(num_pending_prefetch)
 atomic_set(num_pending_prefetch,0) // Overwrites other thread's store

Further, live is being used with SRCU as the 'update' in an
acquire/release fashion, so it can not be read and written raw.

Move all live = 1's to after MR initialization is completed and use
smp_store_release/smp_load_acquire() for manipulating it.

Add a missing live = 0 when an implicit MR child is deleted, before
queuing work to do synchronize_srcu().

The barriers in update_odp_mr() were some broken attempt to create a
acquire/release, but were not even applied consistently and missed the
point, delete it as well.

Fixes: 6aec21f6a832 ("IB/mlx5: Page faults handling infrastructure")
Link: https://lore.kernel.org/r/20191001153821.23621-6-jgg@ziepe.ca
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 2ceaef3ea3fb92286d737d9264396df025bc5c76..15e42825cc976e1beba0423f453194f251a9eecb 100644 (file)
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -606,7 +606,7 @@ struct mlx5_ib_mr {
        struct mlx5_ib_dev     *dev;
        u32 out[MLX5_ST_SZ_DW(create_mkey_out)];
        struct mlx5_core_sig_ctx    *sig;
-       int                     live;
+       unsigned int            live;
        void                    *descs_alloc;
        int                     access_flags; /* Needed for rereg MR */
 

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 0ee8fa01177fc97aac900f6afed591883f190979..3a27bddfcf31f57de9707c3160719b597c74cc76 100644 (file)
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -84,32 +84,6 @@ static bool use_umr_mtt_update(struct mlx5_ib_mr *mr, u64 start, u64 length)
                length + (start & (MLX5_ADAPTER_PAGE_SIZE - 1));
 }
 
-static void update_odp_mr(struct mlx5_ib_mr *mr)
-{
-       if (is_odp_mr(mr)) {
-               /*
-                * This barrier prevents the compiler from moving the
-                * setting of umem->odp_data->private to point to our
-                * MR, before reg_umr finished, to ensure that the MR
-                * initialization have finished before starting to
-                * handle invalidations.
-                */
-               smp_wmb();
-               to_ib_umem_odp(mr->umem)->private = mr;
-               /*
-                * Make sure we will see the new
-                * umem->odp_data->private value in the invalidation
-                * routines, before we can get page faults on the
-                * MR. Page faults can happen once we put the MR in
-                * the tree, below this line. Without the barrier,
-                * there can be a fault handling and an invalidation
-                * before umem->odp_data->private == mr is visible to
-                * the invalidation handler.
-                */
-               smp_wmb();
-       }
-}
-
 static void reg_mr_callback(int status, struct mlx5_async_work *context)
 {
        struct mlx5_ib_mr *mr =
@@ -1346,8 +1320,6 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
        mr->umem = umem;
        set_mr_fields(dev, mr, npages, length, access_flags);
 
-       update_odp_mr(mr);
-
        if (use_umr) {
                int update_xlt_flags = MLX5_IB_UPD_XLT_ENABLE;
 
@@ -1363,10 +1335,12 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
                }
        }
 
-       if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)) {
-               mr->live = 1;
+       if (is_odp_mr(mr)) {
+               to_ib_umem_odp(mr->umem)->private = mr;
                atomic_set(&mr->num_pending_prefetch, 0);
        }
+       if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING))
+               smp_store_release(&mr->live, 1);
 
        return &mr->ibmr;
 error:
@@ -1607,7 +1581,7 @@ static void dereg_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr)
                /* Prevent new page faults and
                 * prefetch requests from succeeding
                 */
-               mr->live = 0;
+               WRITE_ONCE(mr->live, 0);
 
                /* Wait for all running page-fault handlers to finish. */
                synchronize_srcu(&dev->mr_srcu);

diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 1930d78c3091cbfc700171c17d4affb7c2915ad1..3f9478d1937668bee0a5fb6cfa8e4e4a43fdc736 100644 (file)
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -231,7 +231,7 @@ static void mr_leaf_free_action(struct work_struct *work)
        mr->parent = NULL;
        synchronize_srcu(&mr->dev->mr_srcu);
 
-       if (imr->live) {
+       if (smp_load_acquire(&imr->live)) {
                srcu_key = srcu_read_lock(&mr->dev->mr_srcu);
                mutex_lock(&odp_imr->umem_mutex);
                mlx5_ib_update_xlt(imr, idx, 1, 0,
@@ -318,6 +318,7 @@ void mlx5_ib_invalidate_range(struct ib_umem_odp *umem_odp, unsigned long start,
 
        if (unlikely(!umem_odp->npages && mr->parent &&
                     !umem_odp->dying)) {
+               WRITE_ONCE(mr->live, 0);
                umem_odp->dying = 1;
                atomic_inc(&mr->parent->num_leaf_free);
                schedule_work(&umem_odp->work);
@@ -459,8 +460,6 @@ static struct mlx5_ib_mr *implicit_mr_alloc(struct ib_pd *pd,
        mr->ibmr.lkey = mr->mmkey.key;
        mr->ibmr.rkey = mr->mmkey.key;
 
-       mr->live = 1;
-
        mlx5_ib_dbg(dev, "key %x dev %p mr %p\n",
                    mr->mmkey.key, dev->mdev, mr);
 
@@ -514,6 +513,8 @@ next_mr:
                mtt->parent = mr;
                INIT_WORK(&odp->work, mr_leaf_free_action);
 
+               smp_store_release(&mtt->live, 1);
+
                if (!nentries)
                        start_idx = addr >> MLX5_IMR_MTT_SHIFT;
                nentries++;
@@ -566,6 +567,7 @@ struct mlx5_ib_mr *mlx5_ib_alloc_implicit_mr(struct mlx5_ib_pd *pd,
        init_waitqueue_head(&imr->q_leaf_free);
        atomic_set(&imr->num_leaf_free, 0);
        atomic_set(&imr->num_pending_prefetch, 0);
+       smp_store_release(&imr->live, 1);
 
        return imr;
 }
@@ -807,7 +809,7 @@ next_mr:
        switch (mmkey->type) {
        case MLX5_MKEY_MR:
                mr = container_of(mmkey, struct mlx5_ib_mr, mmkey);
-               if (!mr->live || !mr->ibmr.pd) {
+               if (!smp_load_acquire(&mr->live) || !mr->ibmr.pd) {
                        mlx5_ib_dbg(dev, "got dead MR\n");
                        ret = -EFAULT;
                        goto srcu_unlock;
@@ -1675,12 +1677,12 @@ static bool num_pending_prefetch_inc(struct ib_pd *pd,
 
                mr = container_of(mmkey, struct mlx5_ib_mr, mmkey);
 
-               if (mr->ibmr.pd != pd) {
+               if (!smp_load_acquire(&mr->live)) {
                        ret = false;
                        break;
                }
 
-               if (!mr->live) {
+               if (mr->ibmr.pd != pd) {
                        ret = false;
                        break;
                }