linux-kernel - [PATCH for-next 3/3] RDMA/hns: Disassociate mmap pages for all uctx when HW is being reset

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Message-ID: <20240726071910.626802-4-huangjunxian6@hisilicon.com>
Date: Fri, 26 Jul 2024 15:19:10 +0800
From: Junxian Huang <huangjunxian6@...ilicon.com>
To: <jgg@...pe.ca>, <leon@...nel.org>
CC: <linux-rdma@...r.kernel.org>, <linuxarm@...wei.com>,
	<linux-kernel@...r.kernel.org>, <huangjunxian6@...ilicon.com>
Subject: [PATCH for-next 3/3] RDMA/hns: Disassociate mmap pages for all uctx when HW is being reset

From: Chengchang Tang <tangchengchang@...wei.com>

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.

Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
Signed-off-by: Chengchang Tang <tangchengchang@...wei.com>
Signed-off-by: Junxian Huang <huangjunxian6@...ilicon.com>
---
 drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
index 621b057fb9da..8adf8430212d 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
@@ -7012,6 +7012,18 @@ static void hns_roce_hw_v2_uninit_instance(struct hnae3_handle *handle,
 
 	handle->rinfo.instance_state = HNS_ROCE_STATE_NON_INIT;
 }
+
+static void hns_roce_v2_reset_notify_user(struct hns_roce_dev *hr_dev)
+{
+	struct hns_roce_ucontext *uctx, *tmp;
+
+	mutex_lock(&hr_dev->uctx_list_mutex);
+	list_for_each_entry_safe(uctx, tmp, &hr_dev->uctx_list, list) {
+		rdma_user_mmap_disassociate(&uctx->ibucontext);
+	}
+	mutex_unlock(&hr_dev->uctx_list_mutex);
+}
+
 static int hns_roce_hw_v2_reset_notify_down(struct hnae3_handle *handle)
 {
 	struct hns_roce_dev *hr_dev;
@@ -7030,6 +7042,9 @@ static int hns_roce_hw_v2_reset_notify_down(struct hnae3_handle *handle)
 
 	hr_dev->active = false;
 	hr_dev->dis_db = true;
+
+	hns_roce_v2_reset_notify_user(hr_dev);
+
 	hr_dev->state = HNS_ROCE_DEVICE_STATE_RST_DOWN;
 
 	return 0;
-- 
2.33.0