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RDMA/umem: Use umem->owning_mm inside ODP

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Since ODP had a single struct mmu_notifier located in the ucontext it
could only handle a single MM at a time, and this prevented it from using
the new owning_mm system.

With the prior rework it is now simple to let ODP track multiple MMs per
ucontext, finish the job so that the per_mm is allocated on a mm by mm
basis, and freed when the last umem is dropped from the ucontext.

As a side effect the new saner locking removes the lockdep splat about
nesting the umem_rwsem between mmu_notifier_unregister and
ib_umem_odp_release.

It also makes ODP work with multiple processes, across, fork, etc.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Jason Gunthorpe
2018-09-16 20:48:08 +03:00
committed by Doug Ledford
parent c9990ab39b
commit f27a0d50a4
6 changed files with 191 additions and 169 deletions
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20
include/rdma/ib_umem_odp.h
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@@ -91,8 +91,26 @@ static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
struct ib_ucontext_per_mm {
struct ib_ucontext *context;
struct mm_struct *mm;
struct pid *tgid;
struct rb_root_cached umem_tree;
/* Protects umem_tree */
struct rw_semaphore umem_rwsem;
atomic_t notifier_count;
struct mmu_notifier mn;
/* A list of umems that don't have private mmu notifier counters yet. */
struct list_head no_private_counters;
unsigned int odp_mrs_count;
struct list_head ucontext_list;
};
int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access);
struct ib_umem_odp *ib_alloc_odp_umem(struct ib_ucontext *context,
struct ib_umem_odp *ib_alloc_odp_umem(struct ib_ucontext_per_mm *per_mm,
unsigned long addr, size_t size);
void ib_umem_odp_release(struct ib_umem_odp *umem_odp);