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Diffstat (limited to 'drivers/infiniband/hw/hns/hns_roce_cmd.c')
-rw-r--r--drivers/infiniband/hw/hns/hns_roce_cmd.c291
1 files changed, 291 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hns/hns_roce_cmd.c b/drivers/infiniband/hw/hns/hns_roce_cmd.c
new file mode 100644
index 000000000..c493d7644
--- /dev/null
+++ b/drivers/infiniband/hw/hns/hns_roce_cmd.c
@@ -0,0 +1,291 @@
+/*
+ * Copyright (c) 2016 Hisilicon Limited.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/dmapool.h>
+#include <linux/platform_device.h>
+#include "hns_roce_common.h"
+#include "hns_roce_device.h"
+#include "hns_roce_cmd.h"
+
+#define CMD_POLL_TOKEN 0xffff
+#define CMD_MAX_NUM 32
+#define CMD_TOKEN_MASK 0x1f
+
+static int hns_roce_cmd_mbox_post_hw(struct hns_roce_dev *hr_dev, u64 in_param,
+ u64 out_param, u32 in_modifier,
+ u8 op_modifier, u16 op, u16 token,
+ int event)
+{
+ struct hns_roce_cmdq *cmd = &hr_dev->cmd;
+ int ret;
+
+ mutex_lock(&cmd->hcr_mutex);
+ ret = hr_dev->hw->post_mbox(hr_dev, in_param, out_param, in_modifier,
+ op_modifier, op, token, event);
+ mutex_unlock(&cmd->hcr_mutex);
+
+ return ret;
+}
+
+/* this should be called with "poll_sem" */
+static int __hns_roce_cmd_mbox_poll(struct hns_roce_dev *hr_dev, u64 in_param,
+ u64 out_param, unsigned long in_modifier,
+ u8 op_modifier, u16 op,
+ unsigned long timeout)
+{
+ struct device *dev = hr_dev->dev;
+ int ret;
+
+ ret = hns_roce_cmd_mbox_post_hw(hr_dev, in_param, out_param,
+ in_modifier, op_modifier, op,
+ CMD_POLL_TOKEN, 0);
+ if (ret) {
+ dev_err(dev, "[cmd_poll]hns_roce_cmd_mbox_post_hw failed\n");
+ return ret;
+ }
+
+ return hr_dev->hw->chk_mbox(hr_dev, timeout);
+}
+
+static int hns_roce_cmd_mbox_poll(struct hns_roce_dev *hr_dev, u64 in_param,
+ u64 out_param, unsigned long in_modifier,
+ u8 op_modifier, u16 op, unsigned long timeout)
+{
+ int ret;
+
+ down(&hr_dev->cmd.poll_sem);
+ ret = __hns_roce_cmd_mbox_poll(hr_dev, in_param, out_param, in_modifier,
+ op_modifier, op, timeout);
+ up(&hr_dev->cmd.poll_sem);
+
+ return ret;
+}
+
+void hns_roce_cmd_event(struct hns_roce_dev *hr_dev, u16 token, u8 status,
+ u64 out_param)
+{
+ struct hns_roce_cmd_context *context =
+ &hr_dev->cmd.context[token % hr_dev->cmd.max_cmds];
+
+ if (token != context->token)
+ return;
+
+ context->result = (status == HNS_ROCE_CMD_SUCCESS) ? 0 : (-EIO);
+ context->out_param = out_param;
+ complete(&context->done);
+}
+
+/* this should be called with "use_events" */
+static int __hns_roce_cmd_mbox_wait(struct hns_roce_dev *hr_dev, u64 in_param,
+ u64 out_param, unsigned long in_modifier,
+ u8 op_modifier, u16 op,
+ unsigned long timeout)
+{
+ struct hns_roce_cmdq *cmd = &hr_dev->cmd;
+ struct hns_roce_cmd_context *context;
+ struct device *dev = hr_dev->dev;
+ int ret;
+
+ spin_lock(&cmd->context_lock);
+ WARN_ON(cmd->free_head < 0);
+ context = &cmd->context[cmd->free_head];
+ context->token += cmd->token_mask + 1;
+ cmd->free_head = context->next;
+ spin_unlock(&cmd->context_lock);
+
+ init_completion(&context->done);
+
+ ret = hns_roce_cmd_mbox_post_hw(hr_dev, in_param, out_param,
+ in_modifier, op_modifier, op,
+ context->token, 1);
+ if (ret)
+ goto out;
+
+ /*
+ * It is timeout when wait_for_completion_timeout return 0
+ * The return value is the time limit set in advance
+ * how many seconds showing
+ */
+ if (!wait_for_completion_timeout(&context->done,
+ msecs_to_jiffies(timeout))) {
+ dev_err(dev, "[cmd]wait_for_completion_timeout timeout\n");
+ ret = -EBUSY;
+ goto out;
+ }
+
+ ret = context->result;
+ if (ret) {
+ dev_err(dev, "[cmd]event mod cmd process error!err=%d\n", ret);
+ goto out;
+ }
+
+out:
+ spin_lock(&cmd->context_lock);
+ context->next = cmd->free_head;
+ cmd->free_head = context - cmd->context;
+ spin_unlock(&cmd->context_lock);
+
+ return ret;
+}
+
+static int hns_roce_cmd_mbox_wait(struct hns_roce_dev *hr_dev, u64 in_param,
+ u64 out_param, unsigned long in_modifier,
+ u8 op_modifier, u16 op, unsigned long timeout)
+{
+ int ret;
+
+ down(&hr_dev->cmd.event_sem);
+ ret = __hns_roce_cmd_mbox_wait(hr_dev, in_param, out_param, in_modifier,
+ op_modifier, op, timeout);
+ up(&hr_dev->cmd.event_sem);
+
+ return ret;
+}
+
+int hns_roce_cmd_mbox(struct hns_roce_dev *hr_dev, u64 in_param, u64 out_param,
+ unsigned long in_modifier, u8 op_modifier, u16 op,
+ unsigned long timeout)
+{
+ int ret;
+
+ if (hr_dev->hw->rst_prc_mbox) {
+ ret = hr_dev->hw->rst_prc_mbox(hr_dev);
+ if (ret == CMD_RST_PRC_SUCCESS)
+ return 0;
+ else if (ret == CMD_RST_PRC_EBUSY)
+ return -EBUSY;
+ }
+
+ if (hr_dev->cmd.use_events)
+ ret = hns_roce_cmd_mbox_wait(hr_dev, in_param, out_param,
+ in_modifier, op_modifier, op,
+ timeout);
+ else
+ ret = hns_roce_cmd_mbox_poll(hr_dev, in_param, out_param,
+ in_modifier, op_modifier, op,
+ timeout);
+
+ if (ret == CMD_RST_PRC_EBUSY)
+ return -EBUSY;
+
+ if (ret && (hr_dev->hw->rst_prc_mbox &&
+ hr_dev->hw->rst_prc_mbox(hr_dev) == CMD_RST_PRC_SUCCESS))
+ return 0;
+
+ return ret;
+}
+
+int hns_roce_cmd_init(struct hns_roce_dev *hr_dev)
+{
+ struct device *dev = hr_dev->dev;
+
+ mutex_init(&hr_dev->cmd.hcr_mutex);
+ sema_init(&hr_dev->cmd.poll_sem, 1);
+ hr_dev->cmd.use_events = 0;
+ hr_dev->cmd.max_cmds = CMD_MAX_NUM;
+ hr_dev->cmd.pool = dma_pool_create("hns_roce_cmd", dev,
+ HNS_ROCE_MAILBOX_SIZE,
+ HNS_ROCE_MAILBOX_SIZE, 0);
+ if (!hr_dev->cmd.pool)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void hns_roce_cmd_cleanup(struct hns_roce_dev *hr_dev)
+{
+ dma_pool_destroy(hr_dev->cmd.pool);
+}
+
+int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev)
+{
+ struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
+ int i;
+
+ hr_cmd->context =
+ kcalloc(hr_cmd->max_cmds, sizeof(*hr_cmd->context), GFP_KERNEL);
+ if (!hr_cmd->context)
+ return -ENOMEM;
+
+ for (i = 0; i < hr_cmd->max_cmds; ++i) {
+ hr_cmd->context[i].token = i;
+ hr_cmd->context[i].next = i + 1;
+ }
+
+ hr_cmd->context[hr_cmd->max_cmds - 1].next = -1;
+ hr_cmd->free_head = 0;
+
+ sema_init(&hr_cmd->event_sem, hr_cmd->max_cmds);
+ spin_lock_init(&hr_cmd->context_lock);
+
+ hr_cmd->token_mask = CMD_TOKEN_MASK;
+ hr_cmd->use_events = 1;
+
+ return 0;
+}
+
+void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev)
+{
+ struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
+
+ kfree(hr_cmd->context);
+ hr_cmd->use_events = 0;
+}
+
+struct hns_roce_cmd_mailbox *
+hns_roce_alloc_cmd_mailbox(struct hns_roce_dev *hr_dev)
+{
+ struct hns_roce_cmd_mailbox *mailbox;
+
+ mailbox = kmalloc(sizeof(*mailbox), GFP_KERNEL);
+ if (!mailbox)
+ return ERR_PTR(-ENOMEM);
+
+ mailbox->buf =
+ dma_pool_alloc(hr_dev->cmd.pool, GFP_KERNEL, &mailbox->dma);
+ if (!mailbox->buf) {
+ kfree(mailbox);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return mailbox;
+}
+
+void hns_roce_free_cmd_mailbox(struct hns_roce_dev *hr_dev,
+ struct hns_roce_cmd_mailbox *mailbox)
+{
+ if (!mailbox)
+ return;
+
+ dma_pool_free(hr_dev->cmd.pool, mailbox->buf, mailbox->dma);
+ kfree(mailbox);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 11:44:35 +0000