/*
* Copyright (c) 2013-2015, 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/kernel.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/vmalloc.h>
#include <linux/hardirq.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/cmd.h>
#include "mlx5_core.h"
#include "lib/eq.h"
#include "lib/mlx5.h"
enum {
MLX5_HEALTH_POLL_INTERVAL = 2 * HZ,
MAX_MISSES = 3,
};
enum {
MLX5_HEALTH_SYNDR_FW_ERR = 0x1,
MLX5_HEALTH_SYNDR_IRISC_ERR = 0x7,
MLX5_HEALTH_SYNDR_HW_UNRECOVERABLE_ERR = 0x8,
MLX5_HEALTH_SYNDR_CRC_ERR = 0x9,
MLX5_HEALTH_SYNDR_FETCH_PCI_ERR = 0xa,
MLX5_HEALTH_SYNDR_HW_FTL_ERR = 0xb,
MLX5_HEALTH_SYNDR_ASYNC_EQ_OVERRUN_ERR = 0xc,
MLX5_HEALTH_SYNDR_EQ_ERR = 0xd,
MLX5_HEALTH_SYNDR_EQ_INV = 0xe,
MLX5_HEALTH_SYNDR_FFSER_ERR = 0xf,
MLX5_HEALTH_SYNDR_HIGH_TEMP = 0x10
};
enum {
MLX5_DROP_NEW_HEALTH_WORK,
};
enum {
MLX5_SENSOR_NO_ERR = 0,
MLX5_SENSOR_PCI_COMM_ERR = 1,
MLX5_SENSOR_NIC_DISABLED = 2,
MLX5_SENSOR_NIC_SW_RESET = 3,
};
u8 mlx5_get_nic_state(struct mlx5_core_dev *dev)
{
return (ioread32be(&dev->iseg->cmdq_addr_l_sz) >> 8) & 7;
}
void mlx5_set_nic_state(struct mlx5_core_dev *dev, u8 state)
{
u32 cur_cmdq_addr_l_sz;
cur_cmdq_addr_l_sz = ioread32be(&dev->iseg->cmdq_addr_l_sz);
iowrite32be((cur_cmdq_addr_l_sz & 0xFFFFF000) |
state << MLX5_NIC_IFC_OFFSET,
&dev->iseg->cmdq_addr_l_sz);
}
static bool sensor_pci_not_working(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health = &dev->priv.health;
struct health_buffer __iomem *h = health->health;
/* Offline PCI reads return 0xffffffff */
return (ioread32be(&h->fw_ver) == 0xffffffff);
}
static u32 check_fatal_sensors(struct mlx5_core_dev *dev)
{
if (sensor_pci_not_working(dev))
return MLX5_SENSOR_PCI_COMM_ERR;
if (mlx5_get_nic_state(dev) == MLX5_NIC_IFC_DISABLED)
return MLX5_SENSOR_NIC_DISABLED;
if (mlx5_get_nic_state(dev) == MLX5_NIC_IFC_SW_RESET)
return MLX5_SENSOR_NIC_SW_RESET;
return MLX5_SENSOR_NO_ERR;
}
void mlx5_enter_error_state(struct mlx5_core_dev *dev, bool force)
{
mutex_lock(&dev->intf_state_mutex);
if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
goto unlock;
mlx5_core_err(dev, "start\n");
if (pci_channel_offline(dev->pdev) ||
dev->priv.health.fatal_error != MLX5_SENSOR_NO_ERR || force) {
dev->state = MLX5_DEVICE_STATE_INTERNAL_ERROR;
mlx5_cmd_flush(dev);
}
mlx5_notifier_call_chain(dev->priv.events, MLX5_DEV_EVENT_SYS_ERROR, (void *)1);
mlx5_core_err(dev, "end\n");
unlock:
mutex_unlock(&dev->intf_state_mutex);
}
static void mlx5_handle_bad_state(struct mlx5_core_dev *dev)
{
u8 nic_interface = mlx5_get_nic_state(dev);
switch (nic_interface) {
case MLX5_NIC_IFC_FULL:
mlx5_core_warn(dev, "Expected to see disabled NIC but it is full driver\n");
break;
case MLX5_NIC_IFC_DISABLED:
mlx5_core_warn(dev, "starting teardown\n");
break;
case MLX5_NIC_IFC_NO_DRAM_NIC:
mlx5_core_warn(dev, "Expected to see disabled NIC but it is no dram nic\n");
break;
default:
mlx5_core_warn(dev, "Expected to see disabled NIC but it is has invalid value %d\n",
nic_interface);
}
mlx5_disable_device(dev);
}
/* How much time to wait until health resetting the driver (in msecs) */
#define MLX5_RECOVERY_WAIT_MSECS 60000
static void health_care(struct work_struct *work)
{
struct mlx5_core_health *health;
struct mlx5_core_dev *dev;
struct mlx5_priv *priv;
unsigned long end;
health = container_of(work, struct mlx5_core_health, work);
priv = container_of(health, struct mlx5_priv, health);
dev = container_of(priv, struct mlx5_core_dev, priv);
mlx5_core_warn(dev, "handling bad device here\n");
mlx5_handle_bad_state(dev);
end = jiffies + msecs_to_jiffies(MLX5_RECOVERY_WAIT_MSECS);
while (sensor_pci_not_working(dev)) {
if (time_after(jiffies, end)) {
mlx5_core_err(dev,
"health recovery flow aborted, PCI reads still not working\n");
return;
}
msleep(100);
}
mlx5_core_err(dev, "starting health recovery flow\n");
mlx5_recover_device(dev);
}
static const char *hsynd_str(u8 synd)
{
switch (synd) {
case MLX5_HEALTH_SYNDR_FW_ERR:
return "firmware internal error";
case MLX5_HEALTH_SYNDR_IRISC_ERR:
return "irisc not responding";
case MLX5_HEALTH_SYNDR_HW_UNRECOVERABLE_ERR:
return "unrecoverable hardware error";
case MLX5_HEALTH_SYNDR_CRC_ERR:
return "firmware CRC error";
case MLX5_HEALTH_SYNDR_FETCH_PCI_ERR:
return "ICM fetch PCI error";
case MLX5_HEALTH_SYNDR_HW_FTL_ERR:
return "HW fatal error\n";
case MLX5_HEALTH_SYNDR_ASYNC_EQ_OVERRUN_ERR:
return "async EQ buffer overrun";
case MLX5_HEALTH_SYNDR_EQ_ERR:
return "EQ error";
case MLX5_HEALTH_SYNDR_EQ_INV:
return "Invalid EQ referenced";
case MLX5_HEALTH_SYNDR_FFSER_ERR:
return "FFSER error";
case MLX5_HEALTH_SYNDR_HIGH_TEMP:
return "High temperature";
default:
return "unrecognized error";
}
}
static void print_health_info(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health = &dev->priv.health;
struct health_buffer __iomem *h = health->health;
char fw_str[18];
u32 fw;
int i;
/* If the syndrome is 0, the device is OK and no need to print buffer */
if (!ioread8(&h->synd))
return;
for (i = 0; i < ARRAY_SIZE(h->assert_var); i++)
mlx5_core_err(dev, "assert_var[%d] 0x%08x\n", i,
ioread32be(h->assert_var + i));
mlx5_core_err(dev, "assert_exit_ptr 0x%08x\n",
ioread32be(&h->assert_exit_ptr));
mlx5_core_err(dev, "assert_callra 0x%08x\n",
ioread32be(&h->assert_callra));
sprintf(fw_str, "%d.%d.%d", fw_rev_maj(dev), fw_rev_min(dev), fw_rev_sub(dev));
mlx5_core_err(dev, "fw_ver %s\n", fw_str);
mlx5_core_err(dev, "hw_id 0x%08x\n", ioread32be(&h->hw_id));
mlx5_core_err(dev, "irisc_index %d\n", ioread8(&h->irisc_index));
mlx5_core_err(dev, "synd 0x%x: %s\n", ioread8(&h->synd),
hsynd_str(ioread8(&h->synd)));
mlx5_core_err(dev, "ext_synd 0x%04x\n", ioread16be(&h->ext_synd));
fw = ioread32be(&h->fw_ver);
mlx5_core_err(dev, "raw fw_ver 0x%08x\n", fw);
}
static unsigned long get_next_poll_jiffies(void)
{
unsigned long next;
get_random_bytes(&next, sizeof(next));
next %= HZ;
next += jiffies + MLX5_HEALTH_POLL_INTERVAL;
return next;
}
void mlx5_trigger_health_work(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health = &dev->priv.health;
unsigned long flags;
spin_lock_irqsave(&health->wq_lock, flags);
if (!test_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags))
queue_work(health->wq, &health->work);
else
mlx5_core_err(dev, "new health works are not permitted at this stage\n");
spin_unlock_irqrestore(&health->wq_lock, flags);
}
static void poll_health(struct timer_list *t)
{
struct mlx5_core_dev *dev = from_timer(dev, t, priv.health.timer);
struct mlx5_core_health *health = &dev->priv.health;
u32 fatal_error;
u32 count;
if (dev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
goto out;
count = ioread32be(health->health_counter);
if (count == health->prev)
++health->miss_counter;
else
health->miss_counter = 0;
health->prev = count;
if (health->miss_counter == MAX_MISSES) {
mlx5_core_err(dev, "device's health compromised - reached miss count\n");
print_health_info(dev);
}
fatal_error = check_fatal_sensors(dev);
if (fatal_error && !health->fatal_error) {
mlx5_core_err(dev, "Fatal error %u detected\n", fatal_error);
dev->priv.health.fatal_error = fatal_error;
print_health_info(dev);
mlx5_trigger_health_work(dev);
}
out:
mod_timer(&health->timer, get_next_poll_jiffies());
}
void mlx5_start_health_poll(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health = &dev->priv.health;
timer_setup(&health->timer, poll_health, 0);
health->fatal_error = MLX5_SENSOR_NO_ERR;
clear_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags);
health->health = &dev->iseg->health;
health->health_counter = &dev->iseg->health_counter;
health->timer.expires = round_jiffies(jiffies + MLX5_HEALTH_POLL_INTERVAL);
add_timer(&health->timer);
}
void mlx5_stop_health_poll(struct mlx5_core_dev *dev, bool disable_health)
{
struct mlx5_core_health *health = &dev->priv.health;
unsigned long flags;
if (disable_health) {
spin_lock_irqsave(&health->wq_lock, flags);
set_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags);
spin_unlock_irqrestore(&health->wq_lock, flags);
}
del_timer_sync(&health->timer);
}
void mlx5_drain_health_wq(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health = &dev->priv.health;
unsigned long flags;
spin_lock_irqsave(&health->wq_lock, flags);
set_bit(MLX5_DROP_NEW_HEALTH_WORK, &health->flags);
spin_unlock_irqrestore(&health->wq_lock, flags);
cancel_work_sync(&health->work);
}
void mlx5_health_flush(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health = &dev->priv.health;
flush_workqueue(health->wq);
}
void mlx5_health_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health = &dev->priv.health;
destroy_workqueue(health->wq);
}
int mlx5_health_init(struct mlx5_core_dev *dev)
{
struct mlx5_core_health *health;
char *name;
health = &dev->priv.health;
name = kmalloc(64, GFP_KERNEL);
if (!name)
return -ENOMEM;
strcpy(name, "mlx5_health");
strcat(name, dev_name(dev->device));
health->wq = create_singlethread_workqueue(name);
kfree(name);
if (!health->wq)
return -ENOMEM;
spin_lock_init(&health->wq_lock);
INIT_WORK(&health->work, health_care);
return 0;
}
