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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | // SPDX-License-Identifier: GPL-2.0-only /* * Authors: * Branden Bonaby <brandonbonaby94@gmail.com> */ #include <linux/hyperv.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/err.h> #include "hyperv_vmbus.h" static struct dentry *hv_debug_root; static int hv_debugfs_delay_get(void *data, u64 *val) { *val = *(u32 *)data; return 0; } static int hv_debugfs_delay_set(void *data, u64 val) { if (val > 1000) return -EINVAL; *(u32 *)data = val; return 0; } DEFINE_DEBUGFS_ATTRIBUTE(hv_debugfs_delay_fops, hv_debugfs_delay_get, hv_debugfs_delay_set, "%llu\n"); static int hv_debugfs_state_get(void *data, u64 *val) { *val = *(bool *)data; return 0; } static int hv_debugfs_state_set(void *data, u64 val) { if (val == 1) *(bool *)data = true; else if (val == 0) *(bool *)data = false; else return -EINVAL; return 0; } DEFINE_DEBUGFS_ATTRIBUTE(hv_debugfs_state_fops, hv_debugfs_state_get, hv_debugfs_state_set, "%llu\n"); /* Setup delay files to store test values */ static int hv_debug_delay_files(struct hv_device *dev, struct dentry *root) { struct vmbus_channel *channel = dev->channel; char *buffer = "fuzz_test_buffer_interrupt_delay"; char *message = "fuzz_test_message_delay"; int *buffer_val = &channel->fuzz_testing_interrupt_delay; int *message_val = &channel->fuzz_testing_message_delay; struct dentry *buffer_file, *message_file; buffer_file = debugfs_create_file(buffer, 0644, root, buffer_val, &hv_debugfs_delay_fops); if (IS_ERR(buffer_file)) { pr_debug("debugfs_hyperv: file %s not created\n", buffer); return PTR_ERR(buffer_file); } message_file = debugfs_create_file(message, 0644, root, message_val, &hv_debugfs_delay_fops); if (IS_ERR(message_file)) { pr_debug("debugfs_hyperv: file %s not created\n", message); return PTR_ERR(message_file); } return 0; } /* Setup test state value for vmbus device */ static int hv_debug_set_test_state(struct hv_device *dev, struct dentry *root) { struct vmbus_channel *channel = dev->channel; bool *state = &channel->fuzz_testing_state; char *status = "fuzz_test_state"; struct dentry *test_state; test_state = debugfs_create_file(status, 0644, root, state, &hv_debugfs_state_fops); if (IS_ERR(test_state)) { pr_debug("debugfs_hyperv: file %s not created\n", status); return PTR_ERR(test_state); } return 0; } /* Bind hv device to a dentry for debugfs */ static void hv_debug_set_dir_dentry(struct hv_device *dev, struct dentry *root) { if (hv_debug_root) dev->debug_dir = root; } /* Create all test dentry's and names for fuzz testing */ int hv_debug_add_dev_dir(struct hv_device *dev) { const char *device = dev_name(&dev->device); char *delay_name = "delay"; struct dentry *delay, *dev_root; int ret; if (!IS_ERR(hv_debug_root)) { dev_root = debugfs_create_dir(device, hv_debug_root); if (IS_ERR(dev_root)) { pr_debug("debugfs_hyperv: hyperv/%s/ not created\n", device); return PTR_ERR(dev_root); } hv_debug_set_test_state(dev, dev_root); hv_debug_set_dir_dentry(dev, dev_root); delay = debugfs_create_dir(delay_name, dev_root); if (IS_ERR(delay)) { pr_debug("debugfs_hyperv: hyperv/%s/%s/ not created\n", device, delay_name); return PTR_ERR(delay); } ret = hv_debug_delay_files(dev, delay); return ret; } pr_debug("debugfs_hyperv: hyperv/ not in root debugfs path\n"); return PTR_ERR(hv_debug_root); } /* Remove dentry associated with released hv device */ void hv_debug_rm_dev_dir(struct hv_device *dev) { if (!IS_ERR(hv_debug_root)) debugfs_remove_recursive(dev->debug_dir); } /* Remove all dentrys associated with vmbus testing */ void hv_debug_rm_all_dir(void) { debugfs_remove_recursive(hv_debug_root); } /* Delay buffer/message reads on a vmbus channel */ void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type) { struct vmbus_channel *test_channel = channel->primary_channel ? channel->primary_channel : channel; bool state = test_channel->fuzz_testing_state; if (state) { if (delay_type == 0) udelay(test_channel->fuzz_testing_interrupt_delay); else udelay(test_channel->fuzz_testing_message_delay); } } /* Initialize top dentry for vmbus testing */ int hv_debug_init(void) { hv_debug_root = debugfs_create_dir("hyperv", NULL); if (IS_ERR(hv_debug_root)) { pr_debug("debugfs_hyperv: hyperv/ not created\n"); return PTR_ERR(hv_debug_root); } return 0; } |