blob: 84f3f2b5f097606d98c62a175052c9459c6bc26f [file] [log] [blame]
/*
* 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
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)
{
return hr_dev->hw->post_mbox(hr_dev, in_param, out_param, in_modifier,
op_modifier, op, token, event);
}
/* 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 int timeout)
{
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_ratelimited(hr_dev->dev,
"failed to post mailbox %x in poll mode, ret = %d.\n",
op, ret);
return ret;
}
return hr_dev->hw->poll_mbox_done(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 int 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 (unlikely(token != context->token)) {
dev_err_ratelimited(hr_dev->dev,
"[cmd] invalid ae token %x,context token is %x!\n",
token, context->token);
return;
}
context->result = (status == HNS_ROCE_CMD_SUCCESS) ? 0 : (-EIO);
context->out_param = out_param;
complete(&context->done);
}
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 int 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);
do {
context = &cmd->context[cmd->free_head];
cmd->free_head = context->next;
} while (context->busy);
context->busy = 1;
context->token += cmd->max_cmds;
spin_unlock(&cmd->context_lock);
reinit_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) {
dev_err_ratelimited(dev,
"failed to post mailbox %x in event mode, ret = %d.\n",
op, ret);
goto out;
}
if (!wait_for_completion_timeout(&context->done,
msecs_to_jiffies(timeout))) {
dev_err_ratelimited(dev, "[cmd] token %x mailbox %x timeout.\n",
context->token, op);
ret = -EBUSY;
goto out;
}
ret = context->result;
if (ret)
dev_err_ratelimited(dev, "[cmd] token %x mailbox %x error %d\n",
context->token, op, ret);
out:
context->busy = 0;
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 int 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 int timeout)
{
bool is_busy;
if (hr_dev->hw->chk_mbox_avail)
if (!hr_dev->hw->chk_mbox_avail(hr_dev, &is_busy))
return is_busy ? -EBUSY : 0;
if (hr_dev->cmd.use_events)
return hns_roce_cmd_mbox_wait(hr_dev, in_param, out_param,
in_modifier, op_modifier, op,
timeout);
else
return hns_roce_cmd_mbox_poll(hr_dev, in_param, out_param,
in_modifier, op_modifier, op,
timeout);
}
int hns_roce_cmd_init(struct hns_roce_dev *hr_dev)
{
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", hr_dev->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) {
hr_dev->cmd_mod = 0;
return -ENOMEM;
}
for (i = 0; i < hr_cmd->max_cmds; ++i) {
hr_cmd->context[i].token = i;
hr_cmd->context[i].next = i + 1;
init_completion(&hr_cmd->context[i].done);
}
hr_cmd->context[hr_cmd->max_cmds - 1].next = 0;
hr_cmd->free_head = 0;
sema_init(&hr_cmd->event_sem, hr_cmd->max_cmds);
spin_lock_init(&hr_cmd->context_lock);
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);
}