| From: |
| Junxian Huang <huangjunxian6-AT-hisilicon.com> |
| To: |
| <jgg-AT-ziepe.ca>, <leon-AT-kernel.org> |
| Subject: |
| [PATCH v4 for-next 0/2] RDMA: Provide an API for drivers to disassociate mmap pages |
| Date: |
| Thu, 05 Sep 2024 21:11:53 +0800 |
| Message-ID: |
| <20240905131155.1441478-1-huangjunxian6@hisilicon.com> |
| Cc: |
| <linux-rdma-AT-vger.kernel.org>, <linuxarm-AT-huawei.com>, <linux-kernel-AT-vger.kernel.org>, <huangjunxian6-AT-hisilicon.com> |
| Archive-link: |
| Article |
Provide an API rdma_user_mmap_disassociate() for drivers to disassociate
mmap pages. Use this API in hns to prevent userspace from ringing doorbell
when HW is reset.
v3 -> v4:
* Add the newly introduced disassociation_lock to ib_uverbs_mmap()
and rdma_umap_open() to prevent concurrency with
rdma_user_mmap_disassociate().
* Change the disassociated flag from atomic_t to bool.
v2 -> v3:
* Walk all ufiles of a device in rdma_user_mmap_disassociate() as Jason
commented, so drivers don't need to maintain their own list of ucontexts.
* Add a disassociation_lock in uverbs_user_mmap_disassociate() as Jason
commented to avoid racing between different threads.
* Add a disassociated flag indicating whether mmaps have been disabled
to prevent new mmap after the disassociation.
v1 -> v2:
* Keep uverbs_user_mmap_disassociate() in uverbs_main.c. The new api
rdma_user_mmap_disassociate() is also moved to this file.
* Add "#if IS_ENABLED(CONFIG_INFINIBAND_USER_ACCESS)" to hns's
rdma_user_mmap_disassociate() call.
Chengchang Tang (2):
RDMA/core: Provide rdma_user_mmap_disassociate() to disassociate mmap
pages
RDMA/hns: Disassociate mmap pages for all uctx when HW is being reset
drivers/infiniband/core/uverbs.h | 3 ++
drivers/infiniband/core/uverbs_main.c | 55 ++++++++++++++++++++--
drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 9 ++++
include/rdma/ib_verbs.h | 8 ++++
4 files changed, 71 insertions(+), 4 deletions(-)
--
2.33.0
