From 3d50503b3b33d87bc929eee6b65d206a36bc4579 Mon Sep 17 00:00:00 2001 From: Yixian Liu Date: Thu, 29 Aug 2019 16:41:41 +0800 Subject: RDMA/hns: Optimize cmd init and mode selection for hip08 There are two modes for mailbox command (cmd) queue, i.e., event mode and poll mode. For each mode, we use corresponding semaphores to protect the cmd queue resource competition, so called event_sem and poll_sem. During cmd init, both semaphores are initialized and poll mode is selected. Thus, there is no need to up poll_sema again in cmd_use_polling. Furthermore, there is no need to down the sema of the other side while switching mode. This patch aims to decouple the switch between event mode and poll mode of cmd. Link: https://lore.kernel.org/r/1567068102-56919-2-git-send-email-liweihang@hisilicon.com Signed-off-by: Yixian Liu Signed-off-by: Weihang Li Signed-off-by: Doug Ledford Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/hns/hns_roce_cmd.c | 10 +--------- drivers/infiniband/hw/hns/hns_roce_main.c | 8 ++++---- 2 files changed, 5 insertions(+), 13 deletions(-) (limited to 'drivers') diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.c b/drivers/infiniband/hw/hns/hns_roce_cmd.c index ade26faade8d..455d533dd7c4 100644 --- a/drivers/infiniband/hw/hns/hns_roce_cmd.c +++ b/drivers/infiniband/hw/hns/hns_roce_cmd.c @@ -251,23 +251,15 @@ int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev) hr_cmd->token_mask = CMD_TOKEN_MASK; hr_cmd->use_events = 1; - down(&hr_cmd->poll_sem); - return 0; } void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev) { struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd; - int i; - - hr_cmd->use_events = 0; - - for (i = 0; i < hr_cmd->max_cmds; ++i) - down(&hr_cmd->event_sem); kfree(hr_cmd->context); - up(&hr_cmd->poll_sem); + hr_cmd->use_events = 0; } struct hns_roce_cmd_mailbox diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c index 1b757cc924c3..b5d196c119ee 100644 --- a/drivers/infiniband/hw/hns/hns_roce_main.c +++ b/drivers/infiniband/hw/hns/hns_roce_main.c @@ -902,6 +902,7 @@ int hns_roce_init(struct hns_roce_dev *hr_dev) goto error_failed_cmd_init; } + /* EQ depends on poll mode, event mode depends on EQ */ ret = hr_dev->hw->init_eq(hr_dev); if (ret) { dev_err(dev, "eq init failed!\n"); @@ -911,8 +912,9 @@ int hns_roce_init(struct hns_roce_dev *hr_dev) if (hr_dev->cmd_mod) { ret = hns_roce_cmd_use_events(hr_dev); if (ret) { - dev_err(dev, "Switch to event-driven cmd failed!\n"); - goto error_failed_use_event; + dev_warn(dev, + "Cmd event mode failed, set back to poll!\n"); + hns_roce_cmd_use_polling(hr_dev); } } @@ -955,8 +957,6 @@ error_failed_setup_hca: error_failed_init_hem: if (hr_dev->cmd_mod) hns_roce_cmd_use_polling(hr_dev); - -error_failed_use_event: hr_dev->hw->cleanup_eq(hr_dev); error_failed_eq_table: -- cgit v1.2.3-59-g8ed1b