/*
* Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
*
* 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/workqueue.h>
#include <linux/module.h>
#include "mlx4.h"
enum {
MLX4_CATAS_POLL_INTERVAL = 5 * HZ,
};
int mlx4_internal_err_reset = 1;
module_param_named(internal_err_reset, mlx4_internal_err_reset, int, 0644);
MODULE_PARM_DESC(internal_err_reset,
"Reset device on internal errors if non-zero (default 1)");
static int read_vendor_id(struct mlx4_dev *dev)
{
u16 vendor_id = 0;
int ret;
ret = pci_read_config_word(dev->persist->pdev, 0, &vendor_id);
if (ret) {
mlx4_err(dev, "Failed to read vendor ID, ret=%d\n", ret);
return ret;
}
if (vendor_id == 0xffff) {
mlx4_err(dev, "PCI can't be accessed to read vendor id\n");
return -EINVAL;
}
return 0;
}
static int mlx4_reset_master(struct mlx4_dev *dev)
{
int err = 0;
if (mlx4_is_master(dev))
mlx4_report_internal_err_comm_event(dev);
if (!pci_channel_offline(dev->persist->pdev)) {
err = read_vendor_id(dev);
/* If PCI can't be accessed to read vendor ID we assume that its
* link was disabled and chip was already reset.
*/
if (err)
return 0;
err = mlx4_reset(dev);
if (err)
mlx4_err(dev, "Fail to reset HCA\n");
}
return err;
}
static int mlx4_reset_slave(struct mlx4_dev *dev)
{
#define COM_CHAN_RST_REQ_OFFSET 0x10
#define COM_CHAN_RST_ACK_OFFSET 0x08
u32 comm_flags;
u32 rst_req;
u32 rst_ack;
unsigned long end;
struct mlx4_priv *priv = mlx4_priv(dev);
if (pci_channel_offline(dev->persist->pdev))
return 0;
comm_flags = swab32(readl((__iomem char *)priv->mfunc.comm +
MLX4_COMM_CHAN_FLAGS));
if (comm_flags == 0xffffffff) {
mlx4_err(dev, "VF reset is not needed\n");
return 0;
}
if (!(dev->caps.vf_caps & MLX4_VF_CAP_FLAG_RESET)) {
mlx4_err(dev, "VF reset is not supported\n");
return -EOPNOTSUPP;
}
rst_req = (comm_flags & (u32)(1 << COM_CHAN_RST_REQ_OFFSET)) >>
COM_CHAN_RST_REQ_OFFSET;
rst_ack = (comm_flags & (u32)(1 << COM_CHAN_RST_ACK_OFFSET)) >>
COM_CHAN_RST_ACK_OFFSET;
if (rst_req != rst_ack) {
mlx4_err(dev, "Communication channel isn't sync, fail to send reset\n");
return -EIO;
}
rst_req ^= 1;
mlx4_warn(dev, "VF is sending reset request to Firmware\n");
comm_flags = rst_req << COM_CHAN_RST_REQ_OFFSET;
__raw_writel((__force u32)cpu_to_be32(comm_flags),
(__iomem char *)priv->mfunc.comm + MLX4_COMM_CHAN_FLAGS);
/* Make sure that our comm channel write doesn't
* get mixed in with writes from another CPU.
*/
mmiowb();
end = msecs_to_jiffies(MLX4_COMM_TIME) + jiffies;
while (time_before(jiffies, end)) {
comm_flags = swab32(readl((__iomem char *)priv->mfunc.comm +
MLX4_COMM_CHAN_FLAGS));
rst_ack = (comm_flags & (u32)(1 << COM_CHAN_RST_ACK_OFFSET)) >>
COM_CHAN_RST_ACK_OFFSET;
/* Reading rst_req again since the communication channel can
* be reset at any time by the PF and all its bits will be
* set to zero.
*/
rst_req = (comm_flags & (u32)(1 << COM_CHAN_RST_REQ_OFFSET)) >>
COM_CHAN_RST_REQ_OFFSET;
if (rst_ack == rst_req) {
mlx4_warn(dev, "VF Reset succeed\n");
return 0;
}
cond_resched();
}
mlx4_err(dev, "Fail to send reset over the communication channel\n");
return -ETIMEDOUT;
}
static int mlx4_comm_internal_err(u32 slave_read)
{
return (u32)COMM_CHAN_EVENT_INTERNAL_ERR ==
(slave_read & (u32)COMM_CHAN_EVENT_INTERNAL_ERR) ? 1 : 0;
}
void mlx4_enter_error_state(struct mlx4_dev_persistent *persist)
{
int err;
struct mlx4_dev *dev;
if (!mlx4_internal_err_reset)
return;
mutex_lock(&persist->device_state_mutex);
if (persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR)
goto out;
dev = persist->dev;
mlx4_err(dev, "device is going to be reset\n");
if (mlx4_is_slave(dev))
err = mlx4_reset_slave(dev);
else
err = mlx4_reset_master(dev);
BUG_ON(err != 0);
dev->persist->state |= MLX4_DEVICE_STATE_INTERNAL_ERROR;
mlx4_err(dev, "device was reset successfully\n");
mutex_unlock(&persist->device_state_mutex);
/* At that step HW was already reset, now notify clients */
mlx4_dispatch_event(dev, MLX4_DEV_EVENT_CATASTROPHIC_ERROR, 0);
mlx4_cmd_wake_completions(dev);
return;
out:
mutex_unlock(&persist->device_state_mutex);
}
static void mlx4_handle_error_state(struct mlx4_dev_persistent *persist)
{
int err = 0;
mlx4_enter_error_state(persist);
mutex_lock(&persist->interface_state_mutex);
if (persist->interface_state & MLX4_INTERFACE_STATE_UP &&
!(persist->interface_state & MLX4_INTERFACE_STATE_DELETION)) {
err = mlx4_restart_one(persist->pdev);
mlx4_info(persist->dev, "mlx4_restart_one was ended, ret=%d\n",
err);
}
mutex_unlock(&persist->interface_state_mutex);
}
static void dump_err_buf(struct mlx4_dev *dev)
{
struct mlx4_priv *priv = mlx4_priv(dev);
int i;
mlx4_err(dev, "Internal error detected:\n");
for (i = 0; i < priv->fw.catas_size; ++i)
mlx4_err(dev, " buf[%02x]: %08x\n",
i, swab32(readl(priv->catas_err.map + i)));
}
static void poll_catas(unsigned long dev_ptr)
{
struct mlx4_dev *dev = (struct mlx4_dev *) dev_ptr;
struct mlx4_priv *priv = mlx4_priv(dev);
u32 slave_read;
if (mlx4_is_slave(dev)) {
slave_read = swab32(readl(&priv->mfunc.comm->slave_read));
if (mlx4_comm_internal_err(slave_read)) {
mlx4_warn(dev, "Internal error detected on the communication channel\n");
goto internal_err;
}
} else if (readl(priv->catas_err.map)) {
dump_err_buf(dev);
goto internal_err;
}
if (dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
mlx4_warn(dev, "Internal error mark was detected on device\n");
goto internal_err;
}
mod_timer(&priv->catas_err.timer,
round_jiffies(jiffies + MLX4_CATAS_POLL_INTERVAL));
return;
internal_err:
if (mlx4_internal_err_reset)
queue_work(dev->persist->catas_wq, &dev->persist->catas_work);
}
static void catas_reset(struct work_struct *work)
{
struct mlx4_dev_persistent *persist =
container_of(work, struct mlx4_dev_persistent,
catas_work);
mlx4_handle_error_state(persist);
}
void mlx4_start_catas_poll(struct mlx4_dev *dev)
{
struct mlx4_priv *priv = mlx4_priv(dev);
phys_addr_t addr;
INIT_LIST_HEAD(&priv->catas_err.list);
init_timer(&priv->catas_err.timer);
priv->catas_err.map = NULL;
if (!mlx4_is_slave(dev)) {
addr = pci_resource_start(dev->persist->pdev,
priv->fw.catas_bar) +
priv->fw.catas_offset;
priv->catas_err.map = ioremap(addr, priv->fw.catas_size * 4);
if (!priv->catas_err.map) {
mlx4_warn(dev, "Failed to map internal error buffer at 0x%llx\n",
(unsigned long long)addr);
return;
}
}
priv->catas_err.timer.data = (unsigned long) dev;
priv->catas_err.timer.function = poll_catas;
priv->catas_err.timer.expires =
round_jiffies(jiffies + MLX4_CATAS_POLL_INTERVAL);
add_timer(&priv->catas_err.timer);
}
void mlx4_stop_catas_poll(struct mlx4_dev *dev)
{
struct mlx4_priv *priv = mlx4_priv(dev);
del_timer_sync(&priv->catas_err.timer);
if (priv->catas_err.map) {
iounmap(priv->catas_err.map);
priv->catas_err.map = NULL;
}
if (dev->persist->interface_state & MLX4_INTERFACE_STATE_DELETION)
flush_workqueue(dev->persist->catas_wq);
}
int mlx4_catas_init(struct mlx4_dev *dev)
{
INIT_WORK(&dev->persist->catas_work, catas_reset);
dev->persist->catas_wq = create_singlethread_workqueue("mlx4_health");
if (!dev->persist->catas_wq)
return -ENOMEM;
return 0;
}
void mlx4_catas_end(struct mlx4_dev *dev)
{
if (dev->persist->catas_wq) {
destroy_workqueue(dev->persist->catas_wq);
dev->persist->catas_wq = NULL;
}
}
