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RDMA/core: Create mmap database and cookie helper functions

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Create some common API's for adding entries to a xa_mmap. Searching for
an entry and freeing one.

The general approach is copied from the EFA driver and improved to be more
general and do more to help the drivers. Integration with the core allows
a reference counted scheme with a free function so that the driver can
know when its mmaps are all gone.

This significant new functionality will be helpful for drivers to have the
correct lifetime model for mmap objects.

Link: https://lore.kernel.org/r/20191030094417.16866-3-michal.kalderon@marvell.com
Signed-off-by: Ariel Elior <ariel.elior@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Michal Kalderon
2019-10-30 11:44:11 +02:00
committed by Jason Gunthorpe
parent b86deba977
commit 3411f9f01b
5 changed files with 275 additions and 0 deletions
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2
drivers/infiniband/core/uverbs_cmd.c
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@@ -252,6 +252,8 @@ static int ib_uverbs_get_context(struct uverbs_attr_bundle *attrs)
ucontext->closing = false;
ucontext->cleanup_retryable = false;
xa_init_flags(&ucontext->mmap_xa, XA_FLAGS_ALLOC);
ret = get_unused_fd_flags(O_CLOEXEC);
if (ret < 0)
goto err_free;