Commit 615b9474 authored by Chengchang Tang's avatar Chengchang Tang Committed by Leon Romanovsky
Browse files

RDMA/hns: Disassociate mmap pages for all uctx when HW is being reset 



When HW is being reset, userspace should not ring doorbell otherwise
it may lead to abnormal consequence such as RAS.

Disassociate mmap pages for all uctx to prevent userspace from ringing
doorbell to HW. Since all resources will be destroyed during HW reset,
no new mmap is allowed after HW reset is completed.

Fixes: 9a443537 ("IB/hns: Add driver files for hns RoCE driver")
Signed-off-by: default avatarChengchang Tang <tangchengchang@huawei.com>
Signed-off-by: default avatarJunxian Huang <huangjunxian6@hisilicon.com>
Link: https://patch.msgid.link/20240927103323.1897094-3-huangjunxian6@hisilicon.com


Signed-off-by: default avatarLeon Romanovsky <leon@kernel.org>
parent 51976c6c

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

+4 −0
Original line number Diff line number Diff line
@@ -7017,6 +7017,7 @@ static void hns_roce_hw_v2_uninit_instance(struct hnae3_handle *handle, 


	handle->rinfo.instance_state = HNS_ROCE_STATE_NON_INIT;

}



static int hns_roce_hw_v2_reset_notify_down(struct hnae3_handle *handle)

{

	struct hns_roce_dev *hr_dev;
@@ -7035,6 +7036,9 @@ static int hns_roce_hw_v2_reset_notify_down(struct hnae3_handle *handle) 


	hr_dev->active = false;

	hr_dev->dis_db = true;



	rdma_user_mmap_disassociate(&hr_dev->ib_dev);



	hr_dev->state = HNS_ROCE_DEVICE_STATE_RST_DOWN;



	return 0;

drivers/infiniband/hw/hns/hns_roce_main.c

+5 −0
Original line number Diff line number Diff line
@@ -466,6 +466,11 @@ static int hns_roce_mmap(struct ib_ucontext *uctx, struct vm_area_struct *vma) 
	pgprot_t prot;

	int ret;



	if (hr_dev->dis_db) {

		atomic64_inc(&hr_dev->dfx_cnt[HNS_ROCE_DFX_MMAP_ERR_CNT]);

		return -EPERM;

	}



	rdma_entry = rdma_user_mmap_entry_get_pgoff(uctx, vma->vm_pgoff);

	if (!rdma_entry) {

		atomic64_inc(&hr_dev->dfx_cnt[HNS_ROCE_DFX_MMAP_ERR_CNT]);