1 /* 2 * Copyright (c) 2018, Mellanox Technologies. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * 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 OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include "mlx4.h" 34 35 #define BAD_ACCESS 0xBADACCE5 36 #define HEALTH_BUFFER_SIZE 0x40 37 #define CR_ENABLE_BIT swab32(BIT(6)) 38 #define CR_ENABLE_BIT_OFFSET 0xF3F04 39 #define MAX_NUM_OF_DUMPS_TO_STORE (8) 40 41 static const char *region_cr_space_str = "cr-space"; 42 static const char *region_fw_health_str = "fw-health"; 43 44 /* Set to true in case cr enable bit was set to true before crdump */ 45 static bool crdump_enbale_bit_set; 46 47 static void crdump_enable_crspace_access(struct mlx4_dev *dev, 48 u8 __iomem *cr_space) 49 { 50 /* Get current enable bit value */ 51 crdump_enbale_bit_set = 52 readl(cr_space + CR_ENABLE_BIT_OFFSET) & CR_ENABLE_BIT; 53 54 /* Enable FW CR filter (set bit6 to 0) */ 55 if (crdump_enbale_bit_set) 56 writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) & ~CR_ENABLE_BIT, 57 cr_space + CR_ENABLE_BIT_OFFSET); 58 59 /* Enable block volatile crspace accesses */ 60 writel(swab32(1), cr_space + dev->caps.health_buffer_addrs + 61 HEALTH_BUFFER_SIZE); 62 } 63 64 static void crdump_disable_crspace_access(struct mlx4_dev *dev, 65 u8 __iomem *cr_space) 66 { 67 /* Disable block volatile crspace accesses */ 68 writel(0, cr_space + dev->caps.health_buffer_addrs + 69 HEALTH_BUFFER_SIZE); 70 71 /* Restore FW CR filter value (set bit6 to original value) */ 72 if (crdump_enbale_bit_set) 73 writel(readl(cr_space + CR_ENABLE_BIT_OFFSET) | CR_ENABLE_BIT, 74 cr_space + CR_ENABLE_BIT_OFFSET); 75 } 76 77 static void mlx4_crdump_collect_crspace(struct mlx4_dev *dev, 78 u8 __iomem *cr_space, 79 u32 id) 80 { 81 struct mlx4_fw_crdump *crdump = &dev->persist->crdump; 82 struct pci_dev *pdev = dev->persist->pdev; 83 unsigned long cr_res_size; 84 u8 *crspace_data; 85 int offset; 86 int err; 87 88 if (!crdump->region_crspace) { 89 mlx4_err(dev, "crdump: cr-space region is NULL\n"); 90 return; 91 } 92 93 /* Try to collect CR space */ 94 cr_res_size = pci_resource_len(pdev, 0); 95 crspace_data = kvmalloc(cr_res_size, GFP_KERNEL); 96 if (crspace_data) { 97 for (offset = 0; offset < cr_res_size; offset += 4) 98 *(u32 *)(crspace_data + offset) = 99 readl(cr_space + offset); 100 101 err = devlink_region_snapshot_create(crdump->region_crspace, 102 crspace_data, id, &kvfree); 103 if (err) { 104 kvfree(crspace_data); 105 mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n", 106 region_cr_space_str, id, err); 107 } else { 108 mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n", 109 id, region_cr_space_str); 110 } 111 } else { 112 mlx4_err(dev, "crdump: Failed to allocate crspace buffer\n"); 113 } 114 } 115 116 static void mlx4_crdump_collect_fw_health(struct mlx4_dev *dev, 117 u8 __iomem *cr_space, 118 u32 id) 119 { 120 struct mlx4_fw_crdump *crdump = &dev->persist->crdump; 121 u8 *health_data; 122 int offset; 123 int err; 124 125 if (!crdump->region_fw_health) { 126 mlx4_err(dev, "crdump: fw-health region is NULL\n"); 127 return; 128 } 129 130 /* Try to collect health buffer */ 131 health_data = kvmalloc(HEALTH_BUFFER_SIZE, GFP_KERNEL); 132 if (health_data) { 133 u8 __iomem *health_buf_start = 134 cr_space + dev->caps.health_buffer_addrs; 135 136 for (offset = 0; offset < HEALTH_BUFFER_SIZE; offset += 4) 137 *(u32 *)(health_data + offset) = 138 readl(health_buf_start + offset); 139 140 err = devlink_region_snapshot_create(crdump->region_fw_health, 141 health_data, id, &kvfree); 142 if (err) { 143 kvfree(health_data); 144 mlx4_warn(dev, "crdump: devlink create %s snapshot id %d err %d\n", 145 region_fw_health_str, id, err); 146 } else { 147 mlx4_info(dev, "crdump: added snapshot %d to devlink region %s\n", 148 id, region_fw_health_str); 149 } 150 } else { 151 mlx4_err(dev, "crdump: Failed to allocate health buffer\n"); 152 } 153 } 154 155 int mlx4_crdump_collect(struct mlx4_dev *dev) 156 { 157 struct devlink *devlink = priv_to_devlink(mlx4_priv(dev)); 158 struct mlx4_fw_crdump *crdump = &dev->persist->crdump; 159 struct pci_dev *pdev = dev->persist->pdev; 160 unsigned long cr_res_size; 161 u8 __iomem *cr_space; 162 u32 id; 163 164 if (!dev->caps.health_buffer_addrs) { 165 mlx4_info(dev, "crdump: FW doesn't support health buffer access, skipping\n"); 166 return 0; 167 } 168 169 if (!crdump->snapshot_enable) { 170 mlx4_info(dev, "crdump: devlink snapshot disabled, skipping\n"); 171 return 0; 172 } 173 174 cr_res_size = pci_resource_len(pdev, 0); 175 176 cr_space = ioremap(pci_resource_start(pdev, 0), cr_res_size); 177 if (!cr_space) { 178 mlx4_err(dev, "crdump: Failed to map pci cr region\n"); 179 return -ENODEV; 180 } 181 182 crdump_enable_crspace_access(dev, cr_space); 183 184 /* Get the available snapshot ID for the dumps */ 185 id = devlink_region_shapshot_id_get(devlink); 186 187 /* Try to capture dumps */ 188 mlx4_crdump_collect_crspace(dev, cr_space, id); 189 mlx4_crdump_collect_fw_health(dev, cr_space, id); 190 191 crdump_disable_crspace_access(dev, cr_space); 192 193 iounmap(cr_space); 194 return 0; 195 } 196 197 int mlx4_crdump_init(struct mlx4_dev *dev) 198 { 199 struct devlink *devlink = priv_to_devlink(mlx4_priv(dev)); 200 struct mlx4_fw_crdump *crdump = &dev->persist->crdump; 201 struct pci_dev *pdev = dev->persist->pdev; 202 203 crdump->snapshot_enable = false; 204 205 /* Create cr-space region */ 206 crdump->region_crspace = 207 devlink_region_create(devlink, 208 region_cr_space_str, 209 MAX_NUM_OF_DUMPS_TO_STORE, 210 pci_resource_len(pdev, 0)); 211 if (IS_ERR(crdump->region_crspace)) 212 mlx4_warn(dev, "crdump: create devlink region %s err %ld\n", 213 region_cr_space_str, 214 PTR_ERR(crdump->region_crspace)); 215 216 /* Create fw-health region */ 217 crdump->region_fw_health = 218 devlink_region_create(devlink, 219 region_fw_health_str, 220 MAX_NUM_OF_DUMPS_TO_STORE, 221 HEALTH_BUFFER_SIZE); 222 if (IS_ERR(crdump->region_fw_health)) 223 mlx4_warn(dev, "crdump: create devlink region %s err %ld\n", 224 region_fw_health_str, 225 PTR_ERR(crdump->region_fw_health)); 226 227 return 0; 228 } 229 230 void mlx4_crdump_end(struct mlx4_dev *dev) 231 { 232 struct mlx4_fw_crdump *crdump = &dev->persist->crdump; 233 234 devlink_region_destroy(crdump->region_fw_health); 235 devlink_region_destroy(crdump->region_crspace); 236 } 237