/* * 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 #include #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, 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(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; } }