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35#include <linux/kernel.h>
36#include <linux/module.h>
37#include <linux/pci.h>
38#include <linux/pci_hotplug.h>
39#include <linux/init.h>
40#include <linux/string.h>
41#include <linux/slab.h>
42#include <linux/workqueue.h>
43#include "../pci.h"
44
45#if !defined(MODULE)
46 #define MY_NAME "fakephp"
47#else
48 #define MY_NAME THIS_MODULE->name
49#endif
50
51#define dbg(format, arg...) \
52 do { \
53 if (debug) \
54 printk(KERN_DEBUG "%s: " format, \
55 MY_NAME , ## arg); \
56 } while (0)
57#define err(format, arg...) printk(KERN_ERR "%s: " format, MY_NAME , ## arg)
58#define info(format, arg...) printk(KERN_INFO "%s: " format, MY_NAME , ## arg)
59
60#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
61#define DRIVER_DESC "Fake PCI Hot Plug Controller Driver"
62
63struct dummy_slot {
64 struct list_head node;
65 struct hotplug_slot *slot;
66 struct pci_dev *dev;
67 struct work_struct remove_work;
68 unsigned long removed;
69};
70
71static int debug;
72static int dup_slots;
73static LIST_HEAD(slot_list);
74static struct workqueue_struct *dummyphp_wq;
75
76static void pci_rescan_worker(struct work_struct *work);
77static DECLARE_WORK(pci_rescan_work, pci_rescan_worker);
78
79static int enable_slot (struct hotplug_slot *slot);
80static int disable_slot (struct hotplug_slot *slot);
81
82static struct hotplug_slot_ops dummy_hotplug_slot_ops = {
83 .owner = THIS_MODULE,
84 .enable_slot = enable_slot,
85 .disable_slot = disable_slot,
86};
87
88static void dummy_release(struct hotplug_slot *slot)
89{
90 struct dummy_slot *dslot = slot->private;
91
92 list_del(&dslot->node);
93 kfree(dslot->slot->info);
94 kfree(dslot->slot);
95 pci_dev_put(dslot->dev);
96 kfree(dslot);
97}
98
99#define SLOT_NAME_SIZE 8
100
101static int add_slot(struct pci_dev *dev)
102{
103 struct dummy_slot *dslot;
104 struct hotplug_slot *slot;
105 char name[SLOT_NAME_SIZE];
106 int retval = -ENOMEM;
107 static int count = 1;
108
109 slot = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
110 if (!slot)
111 goto error;
112
113 slot->info = kzalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
114 if (!slot->info)
115 goto error_slot;
116
117 slot->info->power_status = 1;
118 slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
119 slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
120
121 dslot = kzalloc(sizeof(struct dummy_slot), GFP_KERNEL);
122 if (!dslot)
123 goto error_info;
124
125 if (dup_slots)
126 snprintf(name, SLOT_NAME_SIZE, "fake");
127 else
128 snprintf(name, SLOT_NAME_SIZE, "fake%d", count++);
129 dbg("slot->name = %s\n", name);
130 slot->ops = &dummy_hotplug_slot_ops;
131 slot->release = &dummy_release;
132 slot->private = dslot;
133
134 retval = pci_hp_register(slot, dev->bus, PCI_SLOT(dev->devfn), name);
135 if (retval) {
136 err("pci_hp_register failed with error %d\n", retval);
137 goto error_dslot;
138 }
139
140 dbg("slot->name = %s\n", hotplug_slot_name(slot));
141 dslot->slot = slot;
142 dslot->dev = pci_dev_get(dev);
143 list_add (&dslot->node, &slot_list);
144 return retval;
145
146error_dslot:
147 kfree(dslot);
148error_info:
149 kfree(slot->info);
150error_slot:
151 kfree(slot);
152error:
153 return retval;
154}
155
156static int __init pci_scan_buses(void)
157{
158 struct pci_dev *dev = NULL;
159 int lastslot = 0;
160
161 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
162 if (PCI_FUNC(dev->devfn) > 0 &&
163 lastslot == PCI_SLOT(dev->devfn))
164 continue;
165 lastslot = PCI_SLOT(dev->devfn);
166 add_slot(dev);
167 }
168
169 return 0;
170}
171
172static void remove_slot(struct dummy_slot *dslot)
173{
174 int retval;
175
176 dbg("removing slot %s\n", hotplug_slot_name(dslot->slot));
177 retval = pci_hp_deregister(dslot->slot);
178 if (retval)
179 err("Problem unregistering a slot %s\n",
180 hotplug_slot_name(dslot->slot));
181}
182
183
184static void remove_slot_worker(struct work_struct *work)
185{
186 struct dummy_slot *dslot =
187 container_of(work, struct dummy_slot, remove_work);
188 remove_slot(dslot);
189}
190
191
192
193
194
195
196
197
198static void pci_rescan_slot(struct pci_dev *temp)
199{
200 struct pci_bus *bus = temp->bus;
201 struct pci_dev *dev;
202 int func;
203 int retval;
204 u8 hdr_type;
205
206 if (!pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type)) {
207 temp->hdr_type = hdr_type & 0x7f;
208 if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
209 pci_dev_put(dev);
210 else {
211 dev = pci_scan_single_device(bus, temp->devfn);
212 if (dev) {
213 dbg("New device on %s function %x:%x\n",
214 bus->name, temp->devfn >> 3,
215 temp->devfn & 7);
216 retval = pci_bus_add_device(dev);
217 if (retval)
218 dev_err(&dev->dev, "error adding "
219 "device, continuing.\n");
220 else
221 add_slot(dev);
222 }
223 }
224
225 if (!(hdr_type & 0x80))
226 return;
227
228
229 for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
230 if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
231 continue;
232 temp->hdr_type = hdr_type & 0x7f;
233
234 if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
235 pci_dev_put(dev);
236 else {
237 dev = pci_scan_single_device(bus, temp->devfn);
238 if (dev) {
239 dbg("New device on %s function %x:%x\n",
240 bus->name, temp->devfn >> 3,
241 temp->devfn & 7);
242 retval = pci_bus_add_device(dev);
243 if (retval)
244 dev_err(&dev->dev, "error adding "
245 "device, continuing.\n");
246 else
247 add_slot(dev);
248 }
249 }
250 }
251 }
252}
253
254
255
256
257
258
259
260
261static void pci_rescan_bus(const struct pci_bus *bus)
262{
263 unsigned int devfn;
264 struct pci_dev *dev;
265 dev = alloc_pci_dev();
266 if (!dev)
267 return;
268
269 dev->bus = (struct pci_bus*)bus;
270 dev->sysdata = bus->sysdata;
271 for (devfn = 0; devfn < 0x100; devfn += 8) {
272 dev->devfn = devfn;
273 pci_rescan_slot(dev);
274 }
275 kfree(dev);
276}
277
278
279static void pci_rescan_buses(const struct list_head *list)
280{
281 const struct list_head *l;
282 list_for_each(l,list) {
283 const struct pci_bus *b = pci_bus_b(l);
284 pci_rescan_bus(b);
285 pci_rescan_buses(&b->children);
286 }
287}
288
289
290static inline void pci_rescan(void) {
291 pci_rescan_buses(&pci_root_buses);
292}
293
294
295static void pci_rescan_worker(struct work_struct *work)
296{
297 pci_rescan();
298}
299
300static int enable_slot(struct hotplug_slot *hotplug_slot)
301{
302
303 cancel_work_sync(&pci_rescan_work);
304 queue_work(dummyphp_wq, &pci_rescan_work);
305 return 0;
306}
307
308static int disable_slot(struct hotplug_slot *slot)
309{
310 struct dummy_slot *dslot;
311 struct pci_dev *dev;
312 int func;
313
314 if (!slot)
315 return -ENODEV;
316 dslot = slot->private;
317
318 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(slot));
319
320 for (func = 7; func >= 0; func--) {
321 dev = pci_get_slot(dslot->dev->bus, dslot->dev->devfn + func);
322 if (!dev)
323 continue;
324
325 if (test_and_set_bit(0, &dslot->removed)) {
326 dbg("Slot already scheduled for removal\n");
327 return -ENODEV;
328 }
329
330
331 pci_remove_bus_device(dev);
332
333
334
335
336 INIT_WORK(&dslot->remove_work, remove_slot_worker);
337 queue_work(dummyphp_wq, &dslot->remove_work);
338
339 pci_dev_put(dev);
340 }
341 return 0;
342}
343
344static void cleanup_slots (void)
345{
346 struct list_head *tmp;
347 struct list_head *next;
348 struct dummy_slot *dslot;
349
350 destroy_workqueue(dummyphp_wq);
351 list_for_each_safe (tmp, next, &slot_list) {
352 dslot = list_entry (tmp, struct dummy_slot, node);
353 remove_slot(dslot);
354 }
355
356}
357
358static int __init dummyphp_init(void)
359{
360 info(DRIVER_DESC "\n");
361
362 dummyphp_wq = create_singlethread_workqueue(MY_NAME);
363 if (!dummyphp_wq)
364 return -ENOMEM;
365
366 return pci_scan_buses();
367}
368
369
370static void __exit dummyphp_exit(void)
371{
372 cleanup_slots();
373}
374
375module_init(dummyphp_init);
376module_exit(dummyphp_exit);
377
378MODULE_AUTHOR(DRIVER_AUTHOR);
379MODULE_DESCRIPTION(DRIVER_DESC);
380MODULE_LICENSE("GPL");
381module_param(debug, bool, S_IRUGO | S_IWUSR);
382MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
383module_param(dup_slots, bool, S_IRUGO | S_IWUSR);
384MODULE_PARM_DESC(dup_slots, "Force duplicate slot names for debugging");