/*
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* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "mlx4.h"
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#define BAD_ACCESS 0xBADACCE5
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#define HEALTH_BUFFER_SIZE 0x40
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#define CR_ENABLE_BIT swab32(BIT(6))
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#define CR_ENABLE_BIT_OFFSET 0xF3F04
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#define MAX_NUM_OF_DUMPS_TO_STORE (8)
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#define REGION_CR_SPACE "cr-space"
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#define REGION_FW_HEALTH "fw-health"
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static const char * const region_cr_space_str = REGION_CR_SPACE;
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static const char * const region_fw_health_str = REGION_FW_HEALTH;
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static const struct devlink_region_ops region_cr_space_ops = {
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.name = REGION_CR_SPACE,
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.destructor = &kvfree,
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};
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static const struct devlink_region_ops region_fw_health_ops = {
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.name = REGION_FW_HEALTH,
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.destructor = &kvfree,
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};
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/* Set to true in case cr enable bit was set to true before crdump */
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static bool crdump_enbale_bit_set;
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static void crdump_enable_crspace_access(struct mlx4_dev *dev,
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u8 __iomem *cr_space)
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{
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/* Get current enable bit value */
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crdump_enbale_bit_set =
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readl(cr_space + CR_ENABLE_BIT_OFFSET) & CR_ENABLE_BIT;
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/* Enable FW CR filter (set bit6 to 0) */
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if (crdump_enbale_bit_set)
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writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) & ~CR_ENABLE_BIT,
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cr_space + CR_ENABLE_BIT_OFFSET);
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/* Enable block volatile crspace accesses */
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writel(swab32(1), cr_space + dev->caps.health_buffer_addrs +
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HEALTH_BUFFER_SIZE);
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}
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static void crdump_disable_crspace_access(struct mlx4_dev *dev,
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u8 __iomem *cr_space)
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{
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/* Disable block volatile crspace accesses */
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writel(0, cr_space + dev->caps.health_buffer_addrs +
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HEALTH_BUFFER_SIZE);
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/* Restore FW CR filter value (set bit6 to original value) */
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if (crdump_enbale_bit_set)
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writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) | CR_ENABLE_BIT,
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cr_space + CR_ENABLE_BIT_OFFSET);
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}
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static void mlx4_crdump_collect_crspace(struct mlx4_dev *dev,
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u8 __iomem *cr_space,
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u32 id)
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{
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struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
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struct pci_dev *pdev = dev->persist->pdev;
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unsigned long cr_res_size;
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u8 *crspace_data;
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int offset;
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int err;
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if (!crdump->region_crspace) {
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mlx4_err(dev, "crdump: cr-space region is NULL\n");
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return;
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}
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/* Try to collect CR space */
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cr_res_size = pci_resource_len(pdev, 0);
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crspace_data = kvmalloc(cr_res_size, GFP_KERNEL);
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if (crspace_data) {
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for (offset = 0; offset < cr_res_size; offset += 4)
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*(u32 *)(crspace_data + offset) =
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readl(cr_space + offset);
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err = devlink_region_snapshot_create(crdump->region_crspace,
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crspace_data, id);
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if (err) {
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kvfree(crspace_data);
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mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",
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region_cr_space_str, id, err);
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} else {
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mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n",
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id, region_cr_space_str);
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}
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} else {
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mlx4_err(dev, "crdump: Failed to allocate crspace buffer\n");
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}
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}
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static void mlx4_crdump_collect_fw_health(struct mlx4_dev *dev,
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u8 __iomem *cr_space,
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u32 id)
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{
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struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
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u8 *health_data;
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int offset;
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int err;
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if (!crdump->region_fw_health) {
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mlx4_err(dev, "crdump: fw-health region is NULL\n");
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return;
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}
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/* Try to collect health buffer */
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health_data = kvmalloc(HEALTH_BUFFER_SIZE, GFP_KERNEL);
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if (health_data) {
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u8 __iomem *health_buf_start =
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cr_space + dev->caps.health_buffer_addrs;
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for (offset = 0; offset < HEALTH_BUFFER_SIZE; offset += 4)
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*(u32 *)(health_data + offset) =
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readl(health_buf_start + offset);
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err = devlink_region_snapshot_create(crdump->region_fw_health,
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health_data, id);
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if (err) {
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kvfree(health_data);
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mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",
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region_fw_health_str, id, err);
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} else {
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mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n",
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id, region_fw_health_str);
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}
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} else {
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mlx4_err(dev, "crdump: Failed to allocate health buffer\n");
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}
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}
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int mlx4_crdump_collect(struct mlx4_dev *dev)
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{
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struct devlink *devlink = priv_to_devlink(mlx4_priv(dev));
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struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
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struct pci_dev *pdev = dev->persist->pdev;
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unsigned long cr_res_size;
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u8 __iomem *cr_space;
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int err;
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u32 id;
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if (!dev->caps.health_buffer_addrs) {
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mlx4_info(dev, "crdump: FW doesn't support health buffer access, skipping\n");
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return 0;
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}
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if (!crdump->snapshot_enable) {
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mlx4_info(dev, "crdump: devlink snapshot disabled, skipping\n");
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return 0;
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}
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cr_res_size = pci_resource_len(pdev, 0);
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cr_space = ioremap(pci_resource_start(pdev, 0), cr_res_size);
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if (!cr_space) {
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mlx4_err(dev, "crdump: Failed to map pci cr region\n");
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return -ENODEV;
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}
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/* Get the available snapshot ID for the dumps */
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err = devlink_region_snapshot_id_get(devlink, &id);
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if (err) {
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mlx4_err(dev, "crdump: devlink get snapshot id err %d\n", err);
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iounmap(cr_space);
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return err;
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}
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crdump_enable_crspace_access(dev, cr_space);
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/* Try to capture dumps */
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mlx4_crdump_collect_crspace(dev, cr_space, id);
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mlx4_crdump_collect_fw_health(dev, cr_space, id);
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/* Release reference on the snapshot id */
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devlink_region_snapshot_id_put(devlink, id);
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crdump_disable_crspace_access(dev, cr_space);
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iounmap(cr_space);
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return 0;
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}
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int mlx4_crdump_init(struct mlx4_dev *dev)
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{
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struct devlink *devlink = priv_to_devlink(mlx4_priv(dev));
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struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
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struct pci_dev *pdev = dev->persist->pdev;
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crdump->snapshot_enable = false;
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/* Create cr-space region */
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crdump->region_crspace =
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devlink_region_create(devlink,
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®ion_cr_space_ops,
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MAX_NUM_OF_DUMPS_TO_STORE,
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pci_resource_len(pdev, 0));
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if (IS_ERR(crdump->region_crspace))
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mlx4_warn(dev, "crdump: create devlink region %s err %ld\n",
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region_cr_space_str,
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PTR_ERR(crdump->region_crspace));
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/* Create fw-health region */
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crdump->region_fw_health =
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devlink_region_create(devlink,
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®ion_fw_health_ops,
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MAX_NUM_OF_DUMPS_TO_STORE,
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HEALTH_BUFFER_SIZE);
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if (IS_ERR(crdump->region_fw_health))
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mlx4_warn(dev, "crdump: create devlink region %s err %ld\n",
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region_fw_health_str,
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PTR_ERR(crdump->region_fw_health));
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return 0;
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}
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void mlx4_crdump_end(struct mlx4_dev *dev)
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{
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struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
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devlink_region_destroy(crdump->region_fw_health);
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devlink_region_destroy(crdump->region_crspace);
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}
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