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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Authors:4 * Branden Bonaby <brandonbonaby94@gmail.com>5 */6 7#include <linux/hyperv.h>8#include <linux/debugfs.h>9#include <linux/delay.h>10#include <linux/err.h>11 12#include "hyperv_vmbus.h"13 14static struct dentry *hv_debug_root;15 16static int hv_debugfs_delay_get(void *data, u64 *val)17{18 *val = *(u32 *)data;19 return 0;20}21 22static int hv_debugfs_delay_set(void *data, u64 val)23{24 if (val > 1000)25 return -EINVAL;26 *(u32 *)data = val;27 return 0;28}29 30DEFINE_DEBUGFS_ATTRIBUTE(hv_debugfs_delay_fops, hv_debugfs_delay_get,31 hv_debugfs_delay_set, "%llu\n");32 33static int hv_debugfs_state_get(void *data, u64 *val)34{35 *val = *(bool *)data;36 return 0;37}38 39static int hv_debugfs_state_set(void *data, u64 val)40{41 if (val == 1)42 *(bool *)data = true;43 else if (val == 0)44 *(bool *)data = false;45 else46 return -EINVAL;47 return 0;48}49 50DEFINE_DEBUGFS_ATTRIBUTE(hv_debugfs_state_fops, hv_debugfs_state_get,51 hv_debugfs_state_set, "%llu\n");52 53/* Setup delay files to store test values */54static int hv_debug_delay_files(struct hv_device *dev, struct dentry *root)55{56 struct vmbus_channel *channel = dev->channel;57 char *buffer = "fuzz_test_buffer_interrupt_delay";58 char *message = "fuzz_test_message_delay";59 int *buffer_val = &channel->fuzz_testing_interrupt_delay;60 int *message_val = &channel->fuzz_testing_message_delay;61 struct dentry *buffer_file, *message_file;62 63 buffer_file = debugfs_create_file(buffer, 0644, root,64 buffer_val,65 &hv_debugfs_delay_fops);66 if (IS_ERR(buffer_file)) {67 pr_debug("debugfs_hyperv: file %s not created\n", buffer);68 return PTR_ERR(buffer_file);69 }70 71 message_file = debugfs_create_file(message, 0644, root,72 message_val,73 &hv_debugfs_delay_fops);74 if (IS_ERR(message_file)) {75 pr_debug("debugfs_hyperv: file %s not created\n", message);76 return PTR_ERR(message_file);77 }78 79 return 0;80}81 82/* Setup test state value for vmbus device */83static int hv_debug_set_test_state(struct hv_device *dev, struct dentry *root)84{85 struct vmbus_channel *channel = dev->channel;86 bool *state = &channel->fuzz_testing_state;87 char *status = "fuzz_test_state";88 struct dentry *test_state;89 90 test_state = debugfs_create_file(status, 0644, root,91 state,92 &hv_debugfs_state_fops);93 if (IS_ERR(test_state)) {94 pr_debug("debugfs_hyperv: file %s not created\n", status);95 return PTR_ERR(test_state);96 }97 98 return 0;99}100 101/* Bind hv device to a dentry for debugfs */102static void hv_debug_set_dir_dentry(struct hv_device *dev, struct dentry *root)103{104 if (hv_debug_root)105 dev->debug_dir = root;106}107 108/* Create all test dentry's and names for fuzz testing */109int hv_debug_add_dev_dir(struct hv_device *dev)110{111 const char *device = dev_name(&dev->device);112 char *delay_name = "delay";113 struct dentry *delay, *dev_root;114 int ret;115 116 if (!IS_ERR(hv_debug_root)) {117 dev_root = debugfs_create_dir(device, hv_debug_root);118 if (IS_ERR(dev_root)) {119 pr_debug("debugfs_hyperv: hyperv/%s/ not created\n",120 device);121 return PTR_ERR(dev_root);122 }123 hv_debug_set_test_state(dev, dev_root);124 hv_debug_set_dir_dentry(dev, dev_root);125 delay = debugfs_create_dir(delay_name, dev_root);126 127 if (IS_ERR(delay)) {128 pr_debug("debugfs_hyperv: hyperv/%s/%s/ not created\n",129 device, delay_name);130 return PTR_ERR(delay);131 }132 ret = hv_debug_delay_files(dev, delay);133 134 return ret;135 }136 pr_debug("debugfs_hyperv: hyperv/ not in root debugfs path\n");137 return PTR_ERR(hv_debug_root);138}139 140/* Remove dentry associated with released hv device */141void hv_debug_rm_dev_dir(struct hv_device *dev)142{143 if (!IS_ERR(hv_debug_root))144 debugfs_remove_recursive(dev->debug_dir);145}146 147/* Remove all dentrys associated with vmbus testing */148void hv_debug_rm_all_dir(void)149{150 debugfs_remove_recursive(hv_debug_root);151}152 153/* Delay buffer/message reads on a vmbus channel */154void hv_debug_delay_test(struct vmbus_channel *channel, enum delay delay_type)155{156 struct vmbus_channel *test_channel = channel->primary_channel ?157 channel->primary_channel :158 channel;159 bool state = test_channel->fuzz_testing_state;160 161 if (state) {162 if (delay_type == 0)163 udelay(test_channel->fuzz_testing_interrupt_delay);164 else165 udelay(test_channel->fuzz_testing_message_delay);166 }167}168 169/* Initialize top dentry for vmbus testing */170int hv_debug_init(void)171{172 hv_debug_root = debugfs_create_dir("hyperv", NULL);173 if (IS_ERR(hv_debug_root)) {174 pr_debug("debugfs_hyperv: hyperv/ not created\n");175 return PTR_ERR(hv_debug_root);176 }177 return 0;178}179