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path: root/drivers/pci/hotplug/fakephp.c
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Diffstat (limited to 'drivers/pci/hotplug/fakephp.c')
-rw-r--r--drivers/pci/hotplug/fakephp.c395
1 files changed, 0 insertions, 395 deletions
diff --git a/drivers/pci/hotplug/fakephp.c b/drivers/pci/hotplug/fakephp.c
deleted file mode 100644
index 16063745766e..000000000000
--- a/drivers/pci/hotplug/fakephp.c
+++ /dev/null
@@ -1,395 +0,0 @@
1/*
2 * Fake PCI Hot Plug Controller Driver
3 *
4 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
5 * Copyright (C) 2003 IBM Corp.
6 * Copyright (C) 2003 Rolf Eike Beer <eike-kernel@sf-tec.de>
7 *
8 * Based on ideas and code from:
9 * Vladimir Kondratiev <vladimir.kondratiev@intel.com>
10 * Rolf Eike Beer <eike-kernel@sf-tec.de>
11 *
12 * All rights reserved.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation, version 2 of the License.
17 *
18 * Send feedback to <greg@kroah.com>
19 */
20
21/*
22 *
23 * This driver will "emulate" removing PCI devices from the system. If
24 * the "power" file is written to with "0" then the specified PCI device
25 * will be completely removed from the kernel.
26 *
27 * WARNING, this does NOT turn off the power to the PCI device. This is
28 * a "logical" removal, not a physical or electrical removal.
29 *
30 * Use this module at your own risk, you have been warned!
31 *
32 * Enabling PCI devices is left as an exercise for the reader...
33 *
34 */
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/* called from the single-threaded workqueue handler to remove a slot */
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 * pci_rescan_slot - Rescan slot
193 * @temp: Device template. Should be set: bus and devfn.
194 *
195 * Tries hard not to re-enable already existing devices;
196 * also handles scanning of subfunctions.
197 */
198static int pci_rescan_slot(struct pci_dev *temp)
199{
200 struct pci_bus *bus = temp->bus;
201 struct pci_dev *dev;
202 int func;
203 u8 hdr_type;
204 int count = 0;
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 count++;
217 }
218 }
219 /* multifunction device? */
220 if (!(hdr_type & 0x80))
221 return count;
222
223 /* continue scanning for other functions */
224 for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
225 if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
226 continue;
227 temp->hdr_type = hdr_type & 0x7f;
228
229 if ((dev = pci_get_slot(bus, temp->devfn)) != NULL)
230 pci_dev_put(dev);
231 else {
232 dev = pci_scan_single_device(bus, temp->devfn);
233 if (dev) {
234 dbg("New device on %s function %x:%x\n",
235 bus->name, temp->devfn >> 3,
236 temp->devfn & 7);
237 count++;
238 }
239 }
240 }
241 }
242
243 return count;
244}
245
246
247/**
248 * pci_rescan_bus_local - fakephp version of rescan PCI bus
249 * @bus: the PCI bus to rescan
250 *
251 * Call pci_rescan_slot for each possible function of the bus.
252 */
253static void pci_rescan_bus_local(const struct pci_bus *bus)
254{
255 unsigned int devfn;
256 struct pci_dev *dev;
257 int retval;
258 int found = 0;
259 dev = alloc_pci_dev();
260 if (!dev)
261 return;
262
263 dev->bus = (struct pci_bus*)bus;
264 dev->sysdata = bus->sysdata;
265 for (devfn = 0; devfn < 0x100; devfn += 8) {
266 dev->devfn = devfn;
267 found += pci_rescan_slot(dev);
268 }
269
270 if (found) {
271 pci_bus_assign_resources(bus);
272 list_for_each_entry(dev, &bus->devices, bus_list) {
273 /* Skip already-added devices */
274 if (dev->is_added)
275 continue;
276 retval = pci_bus_add_device(dev);
277 if (retval)
278 dev_err(&dev->dev,
279 "Error adding device, continuing\n");
280 else
281 add_slot(dev);
282 }
283 pci_bus_add_devices(bus);
284 }
285 kfree(dev);
286}
287
288/* recursively scan all buses */
289static void pci_rescan_buses(const struct list_head *list)
290{
291 const struct list_head *l;
292 list_for_each(l,list) {
293 const struct pci_bus *b = pci_bus_b(l);
294 pci_rescan_bus_local(b);
295 pci_rescan_buses(&b->children);
296 }
297}
298
299/* initiate rescan of all pci buses */
300static inline void pci_rescan(void) {
301 pci_rescan_buses(&pci_root_buses);
302}
303
304/* called from the single-threaded workqueue handler to rescan all pci buses */
305static void pci_rescan_worker(struct work_struct *work)
306{
307 pci_rescan();
308}
309
310static int enable_slot(struct hotplug_slot *hotplug_slot)
311{
312 /* mis-use enable_slot for rescanning of the pci bus */
313 cancel_work_sync(&pci_rescan_work);
314 queue_work(dummyphp_wq, &pci_rescan_work);
315 return 0;
316}
317
318static int disable_slot(struct hotplug_slot *slot)
319{
320 struct dummy_slot *dslot;
321 struct pci_dev *dev;
322 int func;
323
324 if (!slot)
325 return -ENODEV;
326 dslot = slot->private;
327
328 dbg("%s - physical_slot = %s\n", __func__, hotplug_slot_name(slot));
329
330 for (func = 7; func >= 0; func--) {
331 dev = pci_get_slot(dslot->dev->bus, dslot->dev->devfn + func);
332 if (!dev)
333 continue;
334
335 if (test_and_set_bit(0, &dslot->removed)) {
336 dbg("Slot already scheduled for removal\n");
337 pci_dev_put(dev);
338 return -ENODEV;
339 }
340
341 /* remove the device from the pci core */
342 pci_remove_bus_device(dev);
343
344 /* queue work item to blow away this sysfs entry and other
345 * parts.
346 */
347 INIT_WORK(&dslot->remove_work, remove_slot_worker);
348 queue_work(dummyphp_wq, &dslot->remove_work);
349
350 pci_dev_put(dev);
351 }
352 return 0;
353}
354
355static void cleanup_slots (void)
356{
357 struct list_head *tmp;
358 struct list_head *next;
359 struct dummy_slot *dslot;
360
361 destroy_workqueue(dummyphp_wq);
362 list_for_each_safe (tmp, next, &slot_list) {
363 dslot = list_entry (tmp, struct dummy_slot, node);
364 remove_slot(dslot);
365 }
366
367}
368
369static int __init dummyphp_init(void)
370{
371 info(DRIVER_DESC "\n");
372
373 dummyphp_wq = create_singlethread_workqueue(MY_NAME);
374 if (!dummyphp_wq)
375 return -ENOMEM;
376
377 return pci_scan_buses();
378}
379
380
381static void __exit dummyphp_exit(void)
382{
383 cleanup_slots();
384}
385
386module_init(dummyphp_init);
387module_exit(dummyphp_exit);
388
389MODULE_AUTHOR(DRIVER_AUTHOR);
390MODULE_DESCRIPTION(DRIVER_DESC);
391MODULE_LICENSE("GPL");
392module_param(debug, bool, S_IRUGO | S_IWUSR);
393MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
394module_param(dup_slots, bool, S_IRUGO | S_IWUSR);
395MODULE_PARM_DESC(dup_slots, "Force duplicate slot names for debugging");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-25 07:14:34 -0500