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 12static bool mlx5_crdump_enabled(struct mlx5_core_dev *dev) 13{ 14 return !!dev->priv.health.crdump_size; 15} 16 17static 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 41int 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 if (ret == -EBUSY) 59 mlx5_core_info(dev, "SW reset semaphore is already in use\n"); 60 else 61 mlx5_core_warn(dev, "Failed to lock SW reset semaphore\n"); 62 goto unlock_gw; 63 } 64 65 ret = mlx5_vsc_gw_set_space(dev, MLX5_VSC_SPACE_SCAN_CRSPACE, NULL); 66 if (ret) 67 goto unlock_sem; 68 69 ret = mlx5_crdump_fill(dev, cr_data); 70 71unlock_sem: 72 mlx5_vsc_sem_set_space(dev, MLX5_SEMAPHORE_SW_RESET, MLX5_VSC_UNLOCK); 73unlock_gw: 74 mlx5_vsc_gw_unlock(dev); 75 return ret; 76} 77 78int mlx5_crdump_enable(struct mlx5_core_dev *dev) 79{ 80 struct mlx5_priv *priv = &dev->priv; 81 u32 space_size; 82 int ret; 83 84 if (!mlx5_core_is_pf(dev) || !mlx5_vsc_accessible(dev) || 85 mlx5_crdump_enabled(dev)) 86 return 0; 87 88 ret = mlx5_vsc_gw_lock(dev); 89 if (ret) 90 return ret; 91 92 /* Check if space is supported and get space size */ 93 ret = mlx5_vsc_gw_set_space(dev, MLX5_VSC_SPACE_SCAN_CRSPACE, 94 &space_size); 95 if (ret) { 96 /* Unlock and mask error since space is not supported */ 97 mlx5_vsc_gw_unlock(dev); 98 return 0; 99 } 100 101 if (!space_size) { 102 mlx5_core_warn(dev, "Invalid Crspace size, zero\n"); 103 mlx5_vsc_gw_unlock(dev); 104 return -EINVAL; 105 } 106 107 ret = mlx5_vsc_gw_unlock(dev); 108 if (ret) 109 return ret; 110 111 priv->health.crdump_size = space_size; 112 return 0; 113} 114 115void mlx5_crdump_disable(struct mlx5_core_dev *dev) 116{ 117 dev->priv.health.crdump_size = 0; 118} 119