--- /dev/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);
+ /* 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;
+ }
+}
Code Review / kvmfornfv.git / blobdiff