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authorYangyang Li <liyangyang20@huawei.com>2021-01-19 17:28:33 +0800
committerJason Gunthorpe <jgg@nvidia.com>2021-01-19 20:20:13 -0400
commit9293d3fcb70583f2c786f04ca788af026b7c4c5c (patch)
treeda27553935e091e3d6d04328119aec4d98ad9521 /drivers/infiniband
parent9f206f7398f6f6ec7dd0198c045c2459b4f720b6 (diff)
RDMA/hns: Use mutex instead of spinlock for ida allocation
GFP_KERNEL may cause ida_alloc_range() to sleep, but the spinlock covering this function is not allowed to sleep, so the spinlock needs to be changed to mutex. As there is a certain chance of memory allocation failure, GFP_ATOMIC is not suitable for QP allocation scenarios. Fixes: 71586dd20010 ("RDMA/hns: Create QP with selected QPN for bank load balance") Link: https://lore.kernel.org/r/1611048513-28663-1-git-send-email-liweihang@huawei.com Signed-off-by: Yangyang Li <liyangyang20@huawei.com> Signed-off-by: Weihang Li <liweihang@huawei.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/hns/hns_roce_device.h2
-rw-r--r--drivers/infiniband/hw/hns/hns_roce_qp.c11
2 files changed, 7 insertions, 6 deletions
diff --git a/drivers/infiniband/hw/hns/hns_roce_device.h b/drivers/infiniband/hw/hns/hns_roce_device.h
index 55d538625e36..ad8253245a85 100644
--- a/drivers/infiniband/hw/hns/hns_roce_device.h
+++ b/drivers/infiniband/hw/hns/hns_roce_device.h
@@ -532,7 +532,7 @@ struct hns_roce_qp_table {
struct hns_roce_hem_table sccc_table;
struct mutex scc_mutex;
struct hns_roce_bank bank[HNS_ROCE_QP_BANK_NUM];
- spinlock_t bank_lock;
+ struct mutex bank_mutex;
};
struct hns_roce_cq_table {
diff --git a/drivers/infiniband/hw/hns/hns_roce_qp.c b/drivers/infiniband/hw/hns/hns_roce_qp.c
index d8e2fe5558d2..1116371adf74 100644
--- a/drivers/infiniband/hw/hns/hns_roce_qp.c
+++ b/drivers/infiniband/hw/hns/hns_roce_qp.c
@@ -209,7 +209,7 @@ static int alloc_qpn(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp)
hr_qp->doorbell_qpn = 1;
} else {
- spin_lock(&qp_table->bank_lock);
+ mutex_lock(&qp_table->bank_mutex);
bankid = get_least_load_bankid_for_qp(qp_table->bank);
ret = alloc_qpn_with_bankid(&qp_table->bank[bankid], bankid,
@@ -217,12 +217,12 @@ static int alloc_qpn(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp)
if (ret) {
ibdev_err(&hr_dev->ib_dev,
"failed to alloc QPN, ret = %d\n", ret);
- spin_unlock(&qp_table->bank_lock);
+ mutex_unlock(&qp_table->bank_mutex);
return ret;
}
qp_table->bank[bankid].inuse++;
- spin_unlock(&qp_table->bank_lock);
+ mutex_unlock(&qp_table->bank_mutex);
hr_qp->doorbell_qpn = (u32)num;
}
@@ -408,9 +408,9 @@ static void free_qpn(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp)
ida_free(&hr_dev->qp_table.bank[bankid].ida, hr_qp->qpn >> 3);
- spin_lock(&hr_dev->qp_table.bank_lock);
+ mutex_lock(&hr_dev->qp_table.bank_mutex);
hr_dev->qp_table.bank[bankid].inuse--;
- spin_unlock(&hr_dev->qp_table.bank_lock);
+ mutex_unlock(&hr_dev->qp_table.bank_mutex);
}
static int set_rq_size(struct hns_roce_dev *hr_dev, struct ib_qp_cap *cap,
@@ -1371,6 +1371,7 @@ int hns_roce_init_qp_table(struct hns_roce_dev *hr_dev)
unsigned int i;
mutex_init(&qp_table->scc_mutex);
+ mutex_init(&qp_table->bank_mutex);
xa_init(&hr_dev->qp_table_xa);
reserved_from_bot = hr_dev->caps.reserved_qps;