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RDMA/core: Provide rdma_user_mmap_disassociate() to disassociate mmap pages

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[ Upstream commit 51976c6cd786151b6a1bdf8b8b3334beac0ba99c ]

Provide a new api rdma_user_mmap_disassociate() for drivers to
disassociate mmap pages for a device.

Since drivers can now disassociate mmaps by calling this api,
introduce a new disassociation_lock to specifically prevent
races between this disassociation process and new mmaps. And
thus the old hw_destroy_rwsem is not needed in this api.

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20240927103323.1897094-2-huangjunxian6@hisilicon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Stable-dep-of: 615b94746a54 ("RDMA/hns: Disassociate mmap pages for all uctx when HW is being reset")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chengchang Tang
2024-09-27 18:33:22 +08:00
committed by Greg Kroah-Hartman
parent 12b63e2260
commit 86092a4e46
3 changed files with 51 additions and 2 deletions
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include/rdma/ib_verbs.h
+8
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@@ -2948,6 +2948,14 @@ int rdma_user_mmap_entry_insert_range(struct ib_ucontext *ucontext,
size_t length, u32 min_pgoff,
u32 max_pgoff);
#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)
void rdma_user_mmap_disassociate(struct ib_device *device);
#else
static inline void rdma_user_mmap_disassociate(struct ib_device *device)
{
}
#endif
static inline int
rdma_user_mmap_entry_insert_exact(struct ib_ucontext *ucontext,
struct rdma_user_mmap_entry *entry,