ia64/linux-2.6.18-xen.hg

view drivers/serial/8250_pnp.c @ 897:329ea0ccb344

balloon: try harder to balloon up under memory pressure.

Currently if the balloon driver is unable to increase the guest's
reservation it assumes the failure was due to reaching its full
allocation, gives up on the ballooning operation and records the limit
it reached as the "hard limit". The driver will not try again until
the target is set again (even to the same value).

However it is possible that ballooning has in fact failed due to
memory pressure in the host and therefore it is desirable to keep
attempting to reach the target in case memory becomes available. The
most likely scenario is that some guests are ballooning down while
others are ballooning up and therefore there is temporary memory
pressure while things stabilise. You would not expect a well behaved
toolstack to ask a domain to balloon to more than its allocation nor
would you expect it to deliberately over-commit memory by setting
balloon targets which exceed the total host memory.

This patch drops the concept of a hard limit and causes the balloon
driver to retry increasing the reservation on a timer in the same
manner as when decreasing the reservation.

Also if we partially succeed in increasing the reservation
(i.e. receive less pages than we asked for) then we may as well keep
those pages rather than returning them to Xen.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Jun 05 14:01:20 2009 +0100 (2009-06-05)
parents 831230e53067
children
line source
1 /*
2 * linux/drivers/char/8250_pnp.c
3 *
4 * Probe module for 8250/16550-type ISAPNP serial ports.
5 *
6 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
7 *
8 * Copyright (C) 2001 Russell King, All Rights Reserved.
9 *
10 * Ported to the Linux PnP Layer - (C) Adam Belay.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License.
15 *
16 * $Id: 8250_pnp.c,v 1.10 2002/07/21 21:32:30 rmk Exp $
17 */
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/pci.h>
21 #include <linux/pnp.h>
22 #include <linux/string.h>
23 #include <linux/kernel.h>
24 #include <linux/serial_core.h>
25 #include <linux/bitops.h>
27 #include <asm/byteorder.h>
29 #include "8250.h"
31 #define UNKNOWN_DEV 0x3000
34 static const struct pnp_device_id pnp_dev_table[] = {
35 /* Archtek America Corp. */
36 /* Archtek SmartLink Modem 3334BT Plug & Play */
37 { "AAC000F", 0 },
38 /* Anchor Datacomm BV */
39 /* SXPro 144 External Data Fax Modem Plug & Play */
40 { "ADC0001", 0 },
41 /* SXPro 288 External Data Fax Modem Plug & Play */
42 { "ADC0002", 0 },
43 /* PROLiNK 1456VH ISA PnP K56flex Fax Modem */
44 { "AEI0250", 0 },
45 /* Actiontec ISA PNP 56K X2 Fax Modem */
46 { "AEI1240", 0 },
47 /* Rockwell 56K ACF II Fax+Data+Voice Modem */
48 { "AKY1021", 0 /*SPCI_FL_NO_SHIRQ*/ },
49 /* AZT3005 PnP SOUND DEVICE */
50 { "AZT4001", 0 },
51 /* Best Data Products Inc. Smart One 336F PnP Modem */
52 { "BDP3336", 0 },
53 /* Boca Research */
54 /* Boca Complete Ofc Communicator 14.4 Data-FAX */
55 { "BRI0A49", 0 },
56 /* Boca Research 33,600 ACF Modem */
57 { "BRI1400", 0 },
58 /* Boca 33.6 Kbps Internal FD34FSVD */
59 { "BRI3400", 0 },
60 /* Boca 33.6 Kbps Internal FD34FSVD */
61 { "BRI0A49", 0 },
62 /* Best Data Products Inc. Smart One 336F PnP Modem */
63 { "BDP3336", 0 },
64 /* Computer Peripherals Inc */
65 /* EuroViVa CommCenter-33.6 SP PnP */
66 { "CPI4050", 0 },
67 /* Creative Labs */
68 /* Creative Labs Phone Blaster 28.8 DSVD PnP Voice */
69 { "CTL3001", 0 },
70 /* Creative Labs Modem Blaster 28.8 DSVD PnP Voice */
71 { "CTL3011", 0 },
72 /* Creative */
73 /* Creative Modem Blaster Flash56 DI5601-1 */
74 { "DMB1032", 0 },
75 /* Creative Modem Blaster V.90 DI5660 */
76 { "DMB2001", 0 },
77 /* E-Tech */
78 /* E-Tech CyberBULLET PC56RVP */
79 { "ETT0002", 0 },
80 /* FUJITSU */
81 /* Fujitsu 33600 PnP-I2 R Plug & Play */
82 { "FUJ0202", 0 },
83 /* Fujitsu FMV-FX431 Plug & Play */
84 { "FUJ0205", 0 },
85 /* Fujitsu 33600 PnP-I4 R Plug & Play */
86 { "FUJ0206", 0 },
87 /* Fujitsu Fax Voice 33600 PNP-I5 R Plug & Play */
88 { "FUJ0209", 0 },
89 /* Archtek America Corp. */
90 /* Archtek SmartLink Modem 3334BT Plug & Play */
91 { "GVC000F", 0 },
92 /* Hayes */
93 /* Hayes Optima 288 V.34-V.FC + FAX + Voice Plug & Play */
94 { "HAY0001", 0 },
95 /* Hayes Optima 336 V.34 + FAX + Voice PnP */
96 { "HAY000C", 0 },
97 /* Hayes Optima 336B V.34 + FAX + Voice PnP */
98 { "HAY000D", 0 },
99 /* Hayes Accura 56K Ext Fax Modem PnP */
100 { "HAY5670", 0 },
101 /* Hayes Accura 56K Ext Fax Modem PnP */
102 { "HAY5674", 0 },
103 /* Hayes Accura 56K Fax Modem PnP */
104 { "HAY5675", 0 },
105 /* Hayes 288, V.34 + FAX */
106 { "HAYF000", 0 },
107 /* Hayes Optima 288 V.34 + FAX + Voice, Plug & Play */
108 { "HAYF001", 0 },
109 /* IBM */
110 /* IBM Thinkpad 701 Internal Modem Voice */
111 { "IBM0033", 0 },
112 /* Intertex */
113 /* Intertex 28k8 33k6 Voice EXT PnP */
114 { "IXDC801", 0 },
115 /* Intertex 33k6 56k Voice EXT PnP */
116 { "IXDC901", 0 },
117 /* Intertex 28k8 33k6 Voice SP EXT PnP */
118 { "IXDD801", 0 },
119 /* Intertex 33k6 56k Voice SP EXT PnP */
120 { "IXDD901", 0 },
121 /* Intertex 28k8 33k6 Voice SP INT PnP */
122 { "IXDF401", 0 },
123 /* Intertex 28k8 33k6 Voice SP EXT PnP */
124 { "IXDF801", 0 },
125 /* Intertex 33k6 56k Voice SP EXT PnP */
126 { "IXDF901", 0 },
127 /* Kortex International */
128 /* KORTEX 28800 Externe PnP */
129 { "KOR4522", 0 },
130 /* KXPro 33.6 Vocal ASVD PnP */
131 { "KORF661", 0 },
132 /* Lasat */
133 /* LASAT Internet 33600 PnP */
134 { "LAS4040", 0 },
135 /* Lasat Safire 560 PnP */
136 { "LAS4540", 0 },
137 /* Lasat Safire 336 PnP */
138 { "LAS5440", 0 },
139 /* Microcom, Inc. */
140 /* Microcom TravelPorte FAST V.34 Plug & Play */
141 { "MNP0281", 0 },
142 /* Microcom DeskPorte V.34 FAST or FAST+ Plug & Play */
143 { "MNP0336", 0 },
144 /* Microcom DeskPorte FAST EP 28.8 Plug & Play */
145 { "MNP0339", 0 },
146 /* Microcom DeskPorte 28.8P Plug & Play */
147 { "MNP0342", 0 },
148 /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
149 { "MNP0500", 0 },
150 /* Microcom DeskPorte FAST ES 28.8 Plug & Play */
151 { "MNP0501", 0 },
152 /* Microcom DeskPorte 28.8S Internal Plug & Play */
153 { "MNP0502", 0 },
154 /* Motorola */
155 /* Motorola BitSURFR Plug & Play */
156 { "MOT1105", 0 },
157 /* Motorola TA210 Plug & Play */
158 { "MOT1111", 0 },
159 /* Motorola HMTA 200 (ISDN) Plug & Play */
160 { "MOT1114", 0 },
161 /* Motorola BitSURFR Plug & Play */
162 { "MOT1115", 0 },
163 /* Motorola Lifestyle 28.8 Internal */
164 { "MOT1190", 0 },
165 /* Motorola V.3400 Plug & Play */
166 { "MOT1501", 0 },
167 /* Motorola Lifestyle 28.8 V.34 Plug & Play */
168 { "MOT1502", 0 },
169 /* Motorola Power 28.8 V.34 Plug & Play */
170 { "MOT1505", 0 },
171 /* Motorola ModemSURFR External 28.8 Plug & Play */
172 { "MOT1509", 0 },
173 /* Motorola Premier 33.6 Desktop Plug & Play */
174 { "MOT150A", 0 },
175 /* Motorola VoiceSURFR 56K External PnP */
176 { "MOT150F", 0 },
177 /* Motorola ModemSURFR 56K External PnP */
178 { "MOT1510", 0 },
179 /* Motorola ModemSURFR 56K Internal PnP */
180 { "MOT1550", 0 },
181 /* Motorola ModemSURFR Internal 28.8 Plug & Play */
182 { "MOT1560", 0 },
183 /* Motorola Premier 33.6 Internal Plug & Play */
184 { "MOT1580", 0 },
185 /* Motorola OnlineSURFR 28.8 Internal Plug & Play */
186 { "MOT15B0", 0 },
187 /* Motorola VoiceSURFR 56K Internal PnP */
188 { "MOT15F0", 0 },
189 /* Com 1 */
190 /* Deskline K56 Phone System PnP */
191 { "MVX00A1", 0 },
192 /* PC Rider K56 Phone System PnP */
193 { "MVX00F2", 0 },
194 /* NEC 98NOTE SPEAKER PHONE FAX MODEM(33600bps) */
195 { "nEC8241", 0 },
196 /* Pace 56 Voice Internal Plug & Play Modem */
197 { "PMC2430", 0 },
198 /* Generic */
199 /* Generic standard PC COM port */
200 { "PNP0500", 0 },
201 /* Generic 16550A-compatible COM port */
202 { "PNP0501", 0 },
203 /* Compaq 14400 Modem */
204 { "PNPC000", 0 },
205 /* Compaq 2400/9600 Modem */
206 { "PNPC001", 0 },
207 /* Dial-Up Networking Serial Cable between 2 PCs */
208 { "PNPC031", 0 },
209 /* Dial-Up Networking Parallel Cable between 2 PCs */
210 { "PNPC032", 0 },
211 /* Standard 9600 bps Modem */
212 { "PNPC100", 0 },
213 /* Standard 14400 bps Modem */
214 { "PNPC101", 0 },
215 /* Standard 28800 bps Modem*/
216 { "PNPC102", 0 },
217 /* Standard Modem*/
218 { "PNPC103", 0 },
219 /* Standard 9600 bps Modem*/
220 { "PNPC104", 0 },
221 /* Standard 14400 bps Modem*/
222 { "PNPC105", 0 },
223 /* Standard 28800 bps Modem*/
224 { "PNPC106", 0 },
225 /* Standard Modem */
226 { "PNPC107", 0 },
227 /* Standard 9600 bps Modem */
228 { "PNPC108", 0 },
229 /* Standard 14400 bps Modem */
230 { "PNPC109", 0 },
231 /* Standard 28800 bps Modem */
232 { "PNPC10A", 0 },
233 /* Standard Modem */
234 { "PNPC10B", 0 },
235 /* Standard 9600 bps Modem */
236 { "PNPC10C", 0 },
237 /* Standard 14400 bps Modem */
238 { "PNPC10D", 0 },
239 /* Standard 28800 bps Modem */
240 { "PNPC10E", 0 },
241 /* Standard Modem */
242 { "PNPC10F", 0 },
243 /* Standard PCMCIA Card Modem */
244 { "PNP2000", 0 },
245 /* Rockwell */
246 /* Modular Technology */
247 /* Rockwell 33.6 DPF Internal PnP */
248 /* Modular Technology 33.6 Internal PnP */
249 { "ROK0030", 0 },
250 /* Kortex International */
251 /* KORTEX 14400 Externe PnP */
252 { "ROK0100", 0 },
253 /* Rockwell 28.8 */
254 { "ROK4120", 0 },
255 /* Viking Components, Inc */
256 /* Viking 28.8 INTERNAL Fax+Data+Voice PnP */
257 { "ROK4920", 0 },
258 /* Rockwell */
259 /* British Telecom */
260 /* Modular Technology */
261 /* Rockwell 33.6 DPF External PnP */
262 /* BT Prologue 33.6 External PnP */
263 /* Modular Technology 33.6 External PnP */
264 { "RSS00A0", 0 },
265 /* Viking 56K FAX INT */
266 { "RSS0262", 0 },
267 /* K56 par,VV,Voice,Speakphone,AudioSpan,PnP */
268 { "RSS0250", 0 },
269 /* SupraExpress 28.8 Data/Fax PnP modem */
270 { "SUP1310", 0 },
271 /* SupraExpress 33.6 Data/Fax PnP modem */
272 { "SUP1421", 0 },
273 /* SupraExpress 33.6 Data/Fax PnP modem */
274 { "SUP1590", 0 },
275 /* SupraExpress 336i Sp ASVD */
276 { "SUP1620", 0 },
277 /* SupraExpress 33.6 Data/Fax PnP modem */
278 { "SUP1760", 0 },
279 /* SupraExpress 56i Sp Intl */
280 { "SUP2171", 0 },
281 /* Phoebe Micro */
282 /* Phoebe Micro 33.6 Data Fax 1433VQH Plug & Play */
283 { "TEX0011", 0 },
284 /* Archtek America Corp. */
285 /* Archtek SmartLink Modem 3334BT Plug & Play */
286 { "UAC000F", 0 },
287 /* 3Com Corp. */
288 /* Gateway Telepath IIvi 33.6 */
289 { "USR0000", 0 },
290 /* U.S. Robotics Sporster 33.6K Fax INT PnP */
291 { "USR0002", 0 },
292 /* Sportster Vi 14.4 PnP FAX Voicemail */
293 { "USR0004", 0 },
294 /* U.S. Robotics 33.6K Voice INT PnP */
295 { "USR0006", 0 },
296 /* U.S. Robotics 33.6K Voice EXT PnP */
297 { "USR0007", 0 },
298 /* U.S. Robotics Courier V.Everything INT PnP */
299 { "USR0009", 0 },
300 /* U.S. Robotics 33.6K Voice INT PnP */
301 { "USR2002", 0 },
302 /* U.S. Robotics 56K Voice INT PnP */
303 { "USR2070", 0 },
304 /* U.S. Robotics 56K Voice EXT PnP */
305 { "USR2080", 0 },
306 /* U.S. Robotics 56K FAX INT */
307 { "USR3031", 0 },
308 /* U.S. Robotics 56K FAX INT */
309 { "USR3050", 0 },
310 /* U.S. Robotics 56K Voice INT PnP */
311 { "USR3070", 0 },
312 /* U.S. Robotics 56K Voice EXT PnP */
313 { "USR3080", 0 },
314 /* U.S. Robotics 56K Voice INT PnP */
315 { "USR3090", 0 },
316 /* U.S. Robotics 56K Message */
317 { "USR9100", 0 },
318 /* U.S. Robotics 56K FAX EXT PnP*/
319 { "USR9160", 0 },
320 /* U.S. Robotics 56K FAX INT PnP*/
321 { "USR9170", 0 },
322 /* U.S. Robotics 56K Voice EXT PnP*/
323 { "USR9180", 0 },
324 /* U.S. Robotics 56K Voice INT PnP*/
325 { "USR9190", 0 },
326 /* Wacom tablets */
327 { "WACF004", 0 },
328 { "WACF005", 0 },
329 { "WACF006", 0 },
330 /* Rockwell's (PORALiNK) 33600 INT PNP */
331 { "WCI0003", 0 },
332 /* Unkown PnP modems */
333 { "PNPCXXX", UNKNOWN_DEV },
334 /* More unkown PnP modems */
335 { "PNPDXXX", UNKNOWN_DEV },
336 { "", 0 }
337 };
339 MODULE_DEVICE_TABLE(pnp, pnp_dev_table);
341 static char *modem_names[] __devinitdata = {
342 "MODEM", "Modem", "modem", "FAX", "Fax", "fax",
343 "56K", "56k", "K56", "33.6", "28.8", "14.4",
344 "33,600", "28,800", "14,400", "33.600", "28.800", "14.400",
345 "33600", "28800", "14400", "V.90", "V.34", "V.32", NULL
346 };
348 static int __devinit check_name(char *name)
349 {
350 char **tmp;
352 for (tmp = modem_names; *tmp; tmp++)
353 if (strstr(name, *tmp))
354 return 1;
356 return 0;
357 }
359 static int __devinit check_resources(struct pnp_option *option)
360 {
361 struct pnp_option *tmp;
362 if (!option)
363 return 0;
365 for (tmp = option; tmp; tmp = tmp->next) {
366 struct pnp_port *port;
367 for (port = tmp->port; port; port = port->next)
368 if ((port->size == 8) &&
369 ((port->min == 0x2f8) ||
370 (port->min == 0x3f8) ||
371 (port->min == 0x2e8) ||
372 (port->min == 0x3e8)))
373 return 1;
374 }
376 return 0;
377 }
379 /*
380 * Given a complete unknown PnP device, try to use some heuristics to
381 * detect modems. Currently use such heuristic set:
382 * - dev->name or dev->bus->name must contain "modem" substring;
383 * - device must have only one IO region (8 byte long) with base address
384 * 0x2e8, 0x3e8, 0x2f8 or 0x3f8.
385 *
386 * Such detection looks very ugly, but can detect at least some of numerous
387 * PnP modems, alternatively we must hardcode all modems in pnp_devices[]
388 * table.
389 */
390 static int __devinit serial_pnp_guess_board(struct pnp_dev *dev, int *flags)
391 {
392 if (!(check_name(pnp_dev_name(dev)) || (dev->card && check_name(dev->card->name))))
393 return -ENODEV;
395 if (check_resources(dev->independent))
396 return 0;
398 if (check_resources(dev->dependent))
399 return 0;
401 return -ENODEV;
402 }
404 static int __devinit
405 serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
406 {
407 struct uart_port port;
408 int ret, line, flags = dev_id->driver_data;
410 if (flags & UNKNOWN_DEV) {
411 ret = serial_pnp_guess_board(dev, &flags);
412 if (ret < 0)
413 return ret;
414 }
416 memset(&port, 0, sizeof(struct uart_port));
417 port.irq = pnp_irq(dev, 0);
418 if (pnp_port_valid(dev, 0)) {
419 port.iobase = pnp_port_start(dev, 0);
420 port.iotype = UPIO_PORT;
421 } else if (pnp_mem_valid(dev, 0)) {
422 port.mapbase = pnp_mem_start(dev, 0);
423 port.iotype = UPIO_MEM;
424 port.flags = UPF_IOREMAP;
425 } else
426 return -ENODEV;
428 #ifdef SERIAL_DEBUG_PNP
429 printk("Setup PNP port: port %x, mem 0x%lx, irq %d, type %d\n",
430 port.iobase, port.mapbase, port.irq, port.iotype);
431 #endif
433 port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
434 if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
435 port.flags |= UPF_SHARE_IRQ;
436 port.uartclk = 1843200;
437 port.dev = &dev->dev;
439 line = serial8250_register_port(&port);
441 if (line >= 0)
442 pnp_set_drvdata(dev, (void *)((long)line + 1));
443 return line >= 0 ? 0 : -ENODEV;
445 }
447 static void __devexit serial_pnp_remove(struct pnp_dev *dev)
448 {
449 long line = (long)pnp_get_drvdata(dev);
450 if (line)
451 serial8250_unregister_port(line - 1);
452 }
454 static struct pnp_driver serial_pnp_driver = {
455 .name = "serial",
456 .id_table = pnp_dev_table,
457 .probe = serial_pnp_probe,
458 .remove = __devexit_p(serial_pnp_remove),
459 };
461 static int __init serial8250_pnp_init(void)
462 {
463 return pnp_register_driver(&serial_pnp_driver);
464 }
466 static void __exit serial8250_pnp_exit(void)
467 {
468 pnp_unregister_driver(&serial_pnp_driver);
469 }
471 module_init(serial8250_pnp_init);
472 module_exit(serial8250_pnp_exit);
474 MODULE_LICENSE("GPL");
475 MODULE_DESCRIPTION("Generic 8250/16x50 PnP serial driver");