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/types.h> 32 #include <linux/proc_fs.h> 33 #include <linux/workqueue.h> 34 #include <linux/pci.h> 35 #include <linux/pci_hotplug.h> 36 #include <linux/smp_lock.h> 37 #include <linux/debugfs.h> 38 #include "cpqphp.h" 39 40 static int show_ctrl (struct controller *ctrl, char *buf) 41 { 42 char *out = buf; 43 int index; 44 struct pci_resource *res; 45 46 out += sprintf(buf, "Free resources: memory\n"); 47 index = 11; 48 res = ctrl->mem_head; 49 while (res && index--) { 50 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 51 res = res->next; 52 } 53 out += sprintf(out, "Free resources: prefetchable memory\n"); 54 index = 11; 55 res = ctrl->p_mem_head; 56 while (res && index--) { 57 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 58 res = res->next; 59 } 60 out += sprintf(out, "Free resources: IO\n"); 61 index = 11; 62 res = ctrl->io_head; 63 while (res && index--) { 64 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 65 res = res->next; 66 } 67 out += sprintf(out, "Free resources: bus numbers\n"); 68 index = 11; 69 res = ctrl->bus_head; 70 while (res && index--) { 71 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 72 res = res->next; 73 } 74 75 return out - buf; 76 } 77 78 static int show_dev (struct controller *ctrl, char *buf) 79 { 80 char * out = buf; 81 int index; 82 struct pci_resource *res; 83 struct pci_func *new_slot; 84 struct slot *slot; 85 86 slot = ctrl->slot; 87 88 while (slot) { 89 new_slot = cpqhp_slot_find(slot->bus, slot->device, 0); 90 if (!new_slot) 91 break; 92 out += sprintf(out, "assigned resources: memory\n"); 93 index = 11; 94 res = new_slot->mem_head; 95 while (res && index--) { 96 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 97 res = res->next; 98 } 99 out += sprintf(out, "assigned resources: prefetchable memory\n"); 100 index = 11; 101 res = new_slot->p_mem_head; 102 while (res && index--) { 103 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 104 res = res->next; 105 } 106 out += sprintf(out, "assigned resources: IO\n"); 107 index = 11; 108 res = new_slot->io_head; 109 while (res && index--) { 110 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 111 res = res->next; 112 } 113 out += sprintf(out, "assigned resources: bus numbers\n"); 114 index = 11; 115 res = new_slot->bus_head; 116 while (res && index--) { 117 out += sprintf(out, "start = %8.8x, length = %8.8x\n", res->base, res->length); 118 res = res->next; 119 } 120 slot=slot->next; 121 } 122 123 return out - buf; 124 } 125 126 static int spew_debug_info(struct controller *ctrl, char *data, int size) 127 { 128 int used; 129 130 used = size - show_ctrl(ctrl, data); 131 used = (size - used) - show_dev(ctrl, &data[used]); 132 return used; 133 } 134 135 struct ctrl_dbg { 136 int size; 137 char *data; 138 struct controller *ctrl; 139 }; 140 141 #define MAX_OUTPUT (4*PAGE_SIZE) 142 143 static int open(struct inode *inode, struct file *file) 144 { 145 struct controller *ctrl = inode->i_private; 146 struct ctrl_dbg *dbg; 147 int retval = -ENOMEM; 148 149 lock_kernel(); 150 dbg = kmalloc(sizeof(*dbg), GFP_KERNEL); 151 if (!dbg) 152 goto exit; 153 dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL); 154 if (!dbg->data) { 155 kfree(dbg); 156 goto exit; 157 } 158 dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT); 159 file->private_data = dbg; 160 retval = 0; 161 exit: 162 unlock_kernel(); 163 return retval; 164 } 165 166 static loff_t lseek(struct file *file, loff_t off, int whence) 167 { 168 struct ctrl_dbg *dbg; 169 loff_t new = -1; 170 171 lock_kernel(); 172 dbg = file->private_data; 173 174 switch (whence) { 175 case 0: 176 new = off; 177 break; 178 case 1: 179 new = file->f_pos + off; 180 break; 181 } 182 if (new < 0 || new > dbg->size) { 183 unlock_kernel(); 184 return -EINVAL; 185 } 186 unlock_kernel(); 187 return (file->f_pos = new); 188 } 189 190 static ssize_t read(struct file *file, char __user *buf, 191 size_t nbytes, loff_t *ppos) 192 { 193 struct ctrl_dbg *dbg = file->private_data; 194 return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size); 195 } 196 197 static int release(struct inode *inode, struct file *file) 198 { 199 struct ctrl_dbg *dbg = file->private_data; 200 201 kfree(dbg->data); 202 kfree(dbg); 203 return 0; 204 } 205 206 static const struct file_operations debug_ops = { 207 .owner = THIS_MODULE, 208 .open = open, 209 .llseek = lseek, 210 .read = read, 211 .release = release, 212 }; 213 214 static struct dentry *root; 215 216 void cpqhp_initialize_debugfs(void) 217 { 218 if (!root) 219 root = debugfs_create_dir("cpqhp", NULL); 220 } 221 222 void cpqhp_shutdown_debugfs(void) 223 { 224 debugfs_remove(root); 225 } 226 227 void cpqhp_create_debugfs_files(struct controller *ctrl) 228 { 229 ctrl->dentry = debugfs_create_file(dev_name(&ctrl->pci_dev->dev), 230 S_IRUGO, root, ctrl, &debug_ops); 231 } 232 233 void cpqhp_remove_debugfs_files(struct controller *ctrl) 234 { 235 if (ctrl->dentry) 236 debugfs_remove(ctrl->dentry); 237 ctrl->dentry = NULL; 238 } 239 240