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IB/core: Make testing MR flags for writability a static inline function

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commit 08bb558ac11ab944e0539e78619d7b4c356278bd upstream.

Make the MR writability flags check, which is performed in umem.c,
a static inline function in file ib_verbs.h

This allows the function to be used by low-level infiniband drivers.

Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jack Morgenstein 2018-05-23 15:30:30 +03:00 committed by Greg Kroah-Hartman
parent b9341f5aeb
commit 01b377d3f0
2 changed files with 15 additions and 10 deletions
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11
drivers/infiniband/core/umem.c
View File

@ -122,16 +122,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
umem->address = addr; umem->address = addr;
umem->page_size = PAGE_SIZE; umem->page_size = PAGE_SIZE;
umem->pid = get_task_pid(current, PIDTYPE_PID); umem->pid = get_task_pid(current, PIDTYPE_PID);
/* umem->writable = ib_access_writable(access);
* We ask for writable memory if any of the following
* access flags are set. "Local write" and "remote write"
* obviously require write access. "Remote atomic" can do
* things like fetch and add, which will modify memory, and
* "MW bind" can change permissions by binding a window.
*/
umem->writable = !!(access &
(IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND));
if (access & IB_ACCESS_ON_DEMAND) { if (access & IB_ACCESS_ON_DEMAND) {
put_pid(umem->pid); put_pid(umem->pid);

14
include/rdma/ib_verbs.h
View File

@ -3007,6 +3007,20 @@ static inline int ib_check_mr_access(int flags)
return 0; return 0;
} }
static inline bool ib_access_writable(int access_flags)
{
/*
* We have writable memory backing the MR if any of the following
* access flags are set. "Local write" and "remote write" obviously
* require write access. "Remote atomic" can do things like fetch and
* add, which will modify memory, and "MW bind" can change permissions
* by binding a window.
*/
return access_flags &
(IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND);
}
/** /**
* ib_check_mr_status: lightweight check of MR status. * ib_check_mr_status: lightweight check of MR status.
* This routine may provide status checks on a selected * This routine may provide status checks on a selected