1 /* 2 * Compaq Hot Plug Controller Driver 3 * 4 * Copyright (C) 1995,2001 Compaq Computer Corporation 5 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com) 6 * Copyright (C) 2001 IBM Corp. 7 * 8 * All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or (at 13 * your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 18 * NON INFRINGEMENT. See the GNU General Public License for more 19 * details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 * 25 * Send feedback to <greg@kroah.com> 26 * 27 */ 28 29 #include <linux/module.h> 30 #include <linux/kernel.h> 31 #include <linux/slab.h> 32 #include <linux/types.h> 33 #include <linux/proc_fs.h> 34 #include <linux/workqueue.h> 35 #include <linux/pci.h> 36 #include <linux/pci_hotplug.h> 37 #include <linux/smp_lock.h> 38 #include <linux/debugfs.h> 39 #include "cpqphp.h" 40 41 static int show_ctrl (struct controller *ctrl, char *buf) 42 { 43 char *out = buf; 44 int index; 45 struct pci_resource *res; 46 47 out += sprintf(buf, "Free resources: memory\n"); 48 index = 11; 49 res = ctrl->mem_head; 50 while (res && index--) { 51 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 52 res = res->next; 53 } 54 out += sprintf(out, "Free resources: prefetchable memory\n"); 55 index = 11; 56 res = ctrl->p_mem_head; 57 while (res && index--) { 58 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 59 res = res->next; 60 } 61 out += sprintf(out, "Free resources: IO\n"); 62 index = 11; 63 res = ctrl->io_head; 64 while (res && index--) { 65 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 66 res = res->next; 67 } 68 out += sprintf(out, "Free resources: bus numbers\n"); 69 index = 11; 70 res = ctrl->bus_head; 71 while (res && index--) { 72 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 73 res = res->next; 74 } 75 76 return out - buf; 77 } 78 79 static int show_dev (struct controller *ctrl, char *buf) 80 { 81 char * out = buf; 82 int index; 83 struct pci_resource *res; 84 struct pci_func *new_slot; 85 struct slot *slot; 86 87 slot = ctrl->slot; 88 89 while (slot) { 90 new_slot = cpqhp_slot_find(slot->bus, slot->device, 0); 91 if (!new_slot) 92 break; 93 out += sprintf(out, "assigned resources: memory\n"); 94 index = 11; 95 res = new_slot->mem_head; 96 while (res && index--) { 97 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 98 res = res->next; 99 } 100 out += sprintf(out, "assigned resources: prefetchable memory\n"); 101 index = 11; 102 res = new_slot->p_mem_head; 103 while (res && index--) { 104 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 105 res = res->next; 106 } 107 out += sprintf(out, "assigned resources: IO\n"); 108 index = 11; 109 res = new_slot->io_head; 110 while (res && index--) { 111 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 112 res = res->next; 113 } 114 out += sprintf(out, "assigned resources: bus numbers\n"); 115 index = 11; 116 res = new_slot->bus_head; 117 while (res && index--) { 118 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 119 res = res->next; 120 } 121 slot=slot->next; 122 } 123 124 return out - buf; 125 } 126 127 static int spew_debug_info(struct controller *ctrl, char *data, int size) 128 { 129 int used; 130 131 used = size - show_ctrl(ctrl, data); 132 used = (size - used) - show_dev(ctrl, &data[used]); 133 return used; 134 } 135 136 struct ctrl_dbg { 137 int size; 138 char *data; 139 struct controller *ctrl; 140 }; 141 142 #define MAX_OUTPUT (4*PAGE_SIZE) 143 144 static int open(struct inode *inode, struct file *file) 145 { 146 struct controller *ctrl = inode->i_private; 147 struct ctrl_dbg *dbg; 148 int retval = -ENOMEM; 149 150 lock_kernel(); 151 dbg = kmalloc(sizeof(*dbg), GFP_KERNEL); 152 if (!dbg) 153 goto exit; 154 dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL); 155 if (!dbg->data) { 156 kfree(dbg); 157 goto exit; 158 } 159 dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT); 160 file->private_data = dbg; 161 retval = 0; 162 exit: 163 unlock_kernel(); 164 return retval; 165 } 166 167 static loff_t lseek(struct file *file, loff_t off, int whence) 168 { 169 struct ctrl_dbg *dbg; 170 loff_t new = -1; 171 172 lock_kernel(); 173 dbg = file->private_data; 174 175 switch (whence) { 176 case 0: 177 new = off; 178 break; 179 case 1: 180 new = file->f_pos + off; 181 break; 182 } 183 if (new < 0 || new > dbg->size) { 184 unlock_kernel(); 185 return -EINVAL; 186 } 187 unlock_kernel(); 188 return (file->f_pos = new); 189 } 190 191 static ssize_t read(struct file *file, char __user *buf, 192 size_t nbytes, loff_t *ppos) 193 { 194 struct ctrl_dbg *dbg = file->private_data; 195 return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size); 196 } 197 198 static int release(struct inode *inode, struct file *file) 199 { 200 struct ctrl_dbg *dbg = file->private_data; 201 202 kfree(dbg->data); 203 kfree(dbg); 204 return 0; 205 } 206 207 static const struct file_operations debug_ops = { 208 .owner = THIS_MODULE, 209 .open = open, 210 .llseek = lseek, 211 .read = read, 212 .release = release, 213 }; 214 215 static struct dentry *root; 216 217 void cpqhp_initialize_debugfs(void) 218 { 219 if (!root) 220 root = debugfs_create_dir("cpqhp", NULL); 221 } 222 223 void cpqhp_shutdown_debugfs(void) 224 { 225 debugfs_remove(root); 226 } 227 228 void cpqhp_create_debugfs_files(struct controller *ctrl) 229 { 230 ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev), 231 S_IRUGO, root, ctrl, &debug_ops); 232 } 233 234 void cpqhp_remove_debugfs_files(struct controller *ctrl) 235 { 236 if (ctrl->dentry) 237 debugfs_remove(ctrl->dentry); 238 ctrl->dentry = NULL; 239 } 240 241