On Fri, Mar 12, 2021 at 05:38:53PM +0800, Weihang Li wrote:
From: Lang Cheng chenglang@huawei.com
When reloading driver, the head/tail pointer of CMDQ may be not at position 0. Then during initialization of CMDQ, if head is reset first, the firmware will start to handle CMDQ because the head is not equal to the tail. The driver can reset tail first since the firmware will be triggerred only by head. This bug is introduced by changing macros of head/tail register without changing the order of initialization.
Besides, the same name represents opposite meanings in new/old driver, it is hard to maintain, so rename them to PI/CI.
Please split this to two patches for the -rc flow
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c index c3934ab..c359f09 100644 +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c @@ -1194,8 +1194,10 @@ static void hns_roce_cmq_init_regs(struct hns_roce_dev *hr_dev, bool ring_type) upper_32_bits(dma)); roce_write(hr_dev, ROCEE_TX_CMQ_DEPTH_REG, (u32)ring->desc_num >> HNS_ROCE_CMQ_DESC_NUM_S);
roce_write(hr_dev, ROCEE_TX_CMQ_HEAD_REG, 0);roce_write(hr_dev, ROCEE_TX_CMQ_TAIL_REG, 0);
/* Make sure to write CI first and then PI */roce_write(hr_dev, ROCEE_TX_CMQ_CI_REG, 0);roce_write(hr_dev, ROCEE_TX_CMQ_PI_REG, 0);
Only this hunk should be in -rc
Thanks, Jason