drivers/net/ethernet/mellanox/mlx4/catas.c - linux - Git at Google

 /*
  * 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);

 	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;
 }

 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 {
 		mlx4_crdump_collect(dev);
 		err = mlx4_reset_master(dev);
 	}

 	if (!err) {
 		mlx4_err(dev, "device was reset successfully\n");
 	} else {
 		/* EEH could have disabled the PCI channel during reset. That's
 		 * recoverable and the PCI error flow will handle it.
 		 */
 		if (!pci_channel_offline(dev->persist->pdev))
 			BUG_ON(1);
 	}
 	dev->persist->state |= MLX4_DEVICE_STATE_INTERNAL_ERROR;
 	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, NULL);
 	mlx4_cmd_wake_completions(dev);
 	return;

 out:
 	mutex_unlock(&persist->device_state_mutex);
 }

 static void mlx4_handle_error_state(struct mlx4_dev_persistent *persist)
 {
 	struct mlx4_dev *dev = persist->dev;
 	struct devlink *devlink;
 	int err = 0;

 	mlx4_enter_error_state(persist);
 	devlink = priv_to_devlink(mlx4_priv(dev));
 	devl_lock(devlink);
 	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);
 	devl_unlock(devlink);
 }

 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(struct timer_list *t)
 {
 	struct mlx4_priv *priv = from_timer(priv, t, catas_err.timer);
 	struct mlx4_dev *dev = &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);
 	timer_setup(&priv->catas_err.timer, poll_catas, 0);
 	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.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;
 	}
 }
	/*
	* 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);

	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;
	}

	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 {
	mlx4_crdump_collect(dev);
	err = mlx4_reset_master(dev);
	}

	if (!err) {
	mlx4_err(dev, "device was reset successfully\n");
	} else {
	/* EEH could have disabled the PCI channel during reset. That's
	* recoverable and the PCI error flow will handle it.
	*/
	if (!pci_channel_offline(dev->persist->pdev))
	BUG_ON(1);
	}
	dev->persist->state \|= MLX4_DEVICE_STATE_INTERNAL_ERROR;
	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, NULL);
	mlx4_cmd_wake_completions(dev);
	return;

	out:
	mutex_unlock(&persist->device_state_mutex);
	}

	static void mlx4_handle_error_state(struct mlx4_dev_persistent *persist)
	{
	struct mlx4_dev *dev = persist->dev;
	struct devlink *devlink;
	int err = 0;

	mlx4_enter_error_state(persist);
	devlink = priv_to_devlink(mlx4_priv(dev));
	devl_lock(devlink);
	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);
	devl_unlock(devlink);
	}

	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(struct timer_list *t)
	{
	struct mlx4_priv *priv = from_timer(priv, t, catas_err.timer);
	struct mlx4_dev *dev = &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);
	timer_setup(&priv->catas_err.timer, poll_catas, 0);
	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.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;
	}
	}