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1/*2 * Copyright (c) 2018, Mellanox Technologies. All rights reserved.3 *4 * This software is available to you under a choice of one of two5 * licenses. You may choose to be licensed under the terms of the GNU6 * General Public License (GPL) Version 2, available from the file7 * COPYING in the main directory of this source tree, or the8 * OpenIB.org BSD license below:9 *10 * Redistribution and use in source and binary forms, with or11 * without modification, are permitted provided that the following12 * conditions are met:13 *14 * - Redistributions of source code must retain the above15 * copyright notice, this list of conditions and the following16 * disclaimer.17 *18 * - Redistributions in binary form must reproduce the above19 * copyright notice, this list of conditions and the following20 * disclaimer in the documentation and/or other materials21 * provided with the distribution.22 *23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE30 * SOFTWARE.31 */32 33#include "mlx4.h"34 35#define BAD_ACCESS 0xBADACCE536#define HEALTH_BUFFER_SIZE 0x4037#define CR_ENABLE_BIT swab32(BIT(6))38#define CR_ENABLE_BIT_OFFSET 0xF3F0439#define MAX_NUM_OF_DUMPS_TO_STORE (8)40 41#define REGION_CR_SPACE "cr-space"42#define REGION_FW_HEALTH "fw-health"43 44static const char * const region_cr_space_str = REGION_CR_SPACE;45static const char * const region_fw_health_str = REGION_FW_HEALTH;46 47static const struct devlink_region_ops region_cr_space_ops = {48 .name = REGION_CR_SPACE,49 .destructor = &kvfree,50};51 52static const struct devlink_region_ops region_fw_health_ops = {53 .name = REGION_FW_HEALTH,54 .destructor = &kvfree,55};56 57/* Set to true in case cr enable bit was set to true before crdump */58static bool crdump_enbale_bit_set;59 60static void crdump_enable_crspace_access(struct mlx4_dev *dev,61 u8 __iomem *cr_space)62{63 /* Get current enable bit value */64 crdump_enbale_bit_set =65 readl(cr_space + CR_ENABLE_BIT_OFFSET) & CR_ENABLE_BIT;66 67 /* Enable FW CR filter (set bit6 to 0) */68 if (crdump_enbale_bit_set)69 writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) & ~CR_ENABLE_BIT,70 cr_space + CR_ENABLE_BIT_OFFSET);71 72 /* Enable block volatile crspace accesses */73 writel(swab32(1), cr_space + dev->caps.health_buffer_addrs +74 HEALTH_BUFFER_SIZE);75}76 77static void crdump_disable_crspace_access(struct mlx4_dev *dev,78 u8 __iomem *cr_space)79{80 /* Disable block volatile crspace accesses */81 writel(0, cr_space + dev->caps.health_buffer_addrs +82 HEALTH_BUFFER_SIZE);83 84 /* Restore FW CR filter value (set bit6 to original value) */85 if (crdump_enbale_bit_set)86 writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) | CR_ENABLE_BIT,87 cr_space + CR_ENABLE_BIT_OFFSET);88}89 90static void mlx4_crdump_collect_crspace(struct mlx4_dev *dev,91 u8 __iomem *cr_space,92 u32 id)93{94 struct mlx4_fw_crdump *crdump = &dev->persist->crdump;95 struct pci_dev *pdev = dev->persist->pdev;96 unsigned long cr_res_size;97 u8 *crspace_data;98 int offset;99 int err;100 101 if (!crdump->region_crspace) {102 mlx4_err(dev, "crdump: cr-space region is NULL\n");103 return;104 }105 106 /* Try to collect CR space */107 cr_res_size = pci_resource_len(pdev, 0);108 crspace_data = kvmalloc(cr_res_size, GFP_KERNEL);109 if (crspace_data) {110 for (offset = 0; offset < cr_res_size; offset += 4)111 *(u32 *)(crspace_data + offset) =112 readl(cr_space + offset);113 114 err = devlink_region_snapshot_create(crdump->region_crspace,115 crspace_data, id);116 if (err) {117 kvfree(crspace_data);118 mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",119 region_cr_space_str, id, err);120 } else {121 mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n",122 id, region_cr_space_str);123 }124 } else {125 mlx4_err(dev, "crdump: Failed to allocate crspace buffer\n");126 }127}128 129static void mlx4_crdump_collect_fw_health(struct mlx4_dev *dev,130 u8 __iomem *cr_space,131 u32 id)132{133 struct mlx4_fw_crdump *crdump = &dev->persist->crdump;134 u8 *health_data;135 int offset;136 int err;137 138 if (!crdump->region_fw_health) {139 mlx4_err(dev, "crdump: fw-health region is NULL\n");140 return;141 }142 143 /* Try to collect health buffer */144 health_data = kvmalloc(HEALTH_BUFFER_SIZE, GFP_KERNEL);145 if (health_data) {146 u8 __iomem *health_buf_start =147 cr_space + dev->caps.health_buffer_addrs;148 149 for (offset = 0; offset < HEALTH_BUFFER_SIZE; offset += 4)150 *(u32 *)(health_data + offset) =151 readl(health_buf_start + offset);152 153 err = devlink_region_snapshot_create(crdump->region_fw_health,154 health_data, id);155 if (err) {156 kvfree(health_data);157 mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n",158 region_fw_health_str, id, err);159 } else {160 mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n",161 id, region_fw_health_str);162 }163 } else {164 mlx4_err(dev, "crdump: Failed to allocate health buffer\n");165 }166}167 168int mlx4_crdump_collect(struct mlx4_dev *dev)169{170 struct devlink *devlink = priv_to_devlink(mlx4_priv(dev));171 struct mlx4_fw_crdump *crdump = &dev->persist->crdump;172 struct pci_dev *pdev = dev->persist->pdev;173 unsigned long cr_res_size;174 u8 __iomem *cr_space;175 int err;176 u32 id;177 178 if (!dev->caps.health_buffer_addrs) {179 mlx4_info(dev, "crdump: FW doesn't support health buffer access, skipping\n");180 return 0;181 }182 183 if (!crdump->snapshot_enable) {184 mlx4_info(dev, "crdump: devlink snapshot disabled, skipping\n");185 return 0;186 }187 188 cr_res_size = pci_resource_len(pdev, 0);189 190 cr_space = ioremap(pci_resource_start(pdev, 0), cr_res_size);191 if (!cr_space) {192 mlx4_err(dev, "crdump: Failed to map pci cr region\n");193 return -ENODEV;194 }195 196 /* Get the available snapshot ID for the dumps */197 err = devlink_region_snapshot_id_get(devlink, &id);198 if (err) {199 mlx4_err(dev, "crdump: devlink get snapshot id err %d\n", err);200 iounmap(cr_space);201 return err;202 }203 204 crdump_enable_crspace_access(dev, cr_space);205 206 /* Try to capture dumps */207 mlx4_crdump_collect_crspace(dev, cr_space, id);208 mlx4_crdump_collect_fw_health(dev, cr_space, id);209 210 /* Release reference on the snapshot id */211 devlink_region_snapshot_id_put(devlink, id);212 213 crdump_disable_crspace_access(dev, cr_space);214 215 iounmap(cr_space);216 return 0;217}218 219int mlx4_crdump_init(struct mlx4_dev *dev)220{221 struct devlink *devlink = priv_to_devlink(mlx4_priv(dev));222 struct mlx4_fw_crdump *crdump = &dev->persist->crdump;223 struct pci_dev *pdev = dev->persist->pdev;224 225 crdump->snapshot_enable = false;226 227 /* Create cr-space region */228 crdump->region_crspace =229 devl_region_create(devlink,230 ®ion_cr_space_ops,231 MAX_NUM_OF_DUMPS_TO_STORE,232 pci_resource_len(pdev, 0));233 if (IS_ERR(crdump->region_crspace))234 mlx4_warn(dev, "crdump: create devlink region %s err %ld\n",235 region_cr_space_str,236 PTR_ERR(crdump->region_crspace));237 238 /* Create fw-health region */239 crdump->region_fw_health =240 devl_region_create(devlink,241 ®ion_fw_health_ops,242 MAX_NUM_OF_DUMPS_TO_STORE,243 HEALTH_BUFFER_SIZE);244 if (IS_ERR(crdump->region_fw_health))245 mlx4_warn(dev, "crdump: create devlink region %s err %ld\n",246 region_fw_health_str,247 PTR_ERR(crdump->region_fw_health));248 249 return 0;250}251 252void mlx4_crdump_end(struct mlx4_dev *dev)253{254 struct mlx4_fw_crdump *crdump = &dev->persist->crdump;255 256 devl_region_destroy(crdump->region_fw_health);257 devl_region_destroy(crdump->region_crspace);258}259