1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB 2 /* Copyright (c) 2019 Mellanox Technologies */ 3 4 #include <linux/mlx5/driver.h> 5 #include "mlx5_core.h" 6 #include "lib/pci_vsc.h" 7 #include "lib/mlx5.h" 8 9 #define BAD_ACCESS 0xBADACCE5 10 #define MLX5_PROTECTED_CR_SCAN_CRSPACE 0x7 11 12 static bool mlx5_crdump_enabled(struct mlx5_core_dev *dev) 13 { 14 return !!dev->priv.health.crdump_size; 15 } 16 17 static int mlx5_crdump_fill(struct mlx5_core_dev *dev, u32 *cr_data) 18 { 19 u32 crdump_size = dev->priv.health.crdump_size; 20 int i, ret; 21 22 for (i = 0; i < (crdump_size / 4); i++) 23 cr_data[i] = BAD_ACCESS; 24 25 ret = mlx5_vsc_gw_read_block_fast(dev, cr_data, crdump_size); 26 if (ret <= 0) { 27 if (ret == 0) 28 return -EIO; 29 return ret; 30 } 31 32 if (crdump_size != ret) { 33 mlx5_core_warn(dev, "failed to read full dump, read %d out of %u\n", 34 ret, crdump_size); 35 return -EINVAL; 36 } 37 38 return 0; 39 } 40 41 int mlx5_crdump_collect(struct mlx5_core_dev *dev, u32 *cr_data) 42 { 43 int ret; 44 45 if (!mlx5_crdump_enabled(dev)) 46 return -ENODEV; 47 48 ret = mlx5_vsc_gw_lock(dev); 49 if (ret) { 50 mlx5_core_warn(dev, "crdump: failed to lock vsc gw err %d\n", 51 ret); 52 return ret; 53 } 54 /* Verify no other PF is running cr-dump or sw reset */ 55 ret = mlx5_vsc_sem_set_space(dev, MLX5_SEMAPHORE_SW_RESET, 56 MLX5_VSC_LOCK); 57 if (ret) { 58 mlx5_core_warn(dev, "Failed to lock SW reset semaphore\n"); 59 goto unlock_gw; 60 } 61 62 ret = mlx5_vsc_gw_set_space(dev, MLX5_VSC_SPACE_SCAN_CRSPACE, NULL); 63 if (ret) 64 goto unlock_sem; 65 66 ret = mlx5_crdump_fill(dev, cr_data); 67 68 unlock_sem: 69 mlx5_vsc_sem_set_space(dev, MLX5_SEMAPHORE_SW_RESET, MLX5_VSC_UNLOCK); 70 unlock_gw: 71 mlx5_vsc_gw_unlock(dev); 72 return ret; 73 } 74 75 int mlx5_crdump_enable(struct mlx5_core_dev *dev) 76 { 77 struct mlx5_priv *priv = &dev->priv; 78 u32 space_size; 79 int ret; 80 81 if (!mlx5_core_is_pf(dev) || !mlx5_vsc_accessible(dev) || 82 mlx5_crdump_enabled(dev)) 83 return 0; 84 85 ret = mlx5_vsc_gw_lock(dev); 86 if (ret) 87 return ret; 88 89 /* Check if space is supported and get space size */ 90 ret = mlx5_vsc_gw_set_space(dev, MLX5_VSC_SPACE_SCAN_CRSPACE, 91 &space_size); 92 if (ret) { 93 /* Unlock and mask error since space is not supported */ 94 mlx5_vsc_gw_unlock(dev); 95 return 0; 96 } 97 98 if (!space_size) { 99 mlx5_core_warn(dev, "Invalid Crspace size, zero\n"); 100 mlx5_vsc_gw_unlock(dev); 101 return -EINVAL; 102 } 103 104 ret = mlx5_vsc_gw_unlock(dev); 105 if (ret) 106 return ret; 107 108 priv->health.crdump_size = space_size; 109 return 0; 110 } 111 112 void mlx5_crdump_disable(struct mlx5_core_dev *dev) 113 { 114 dev->priv.health.crdump_size = 0; 115 } 116