ia64/linux-2.6.18-xen.hg

view drivers/net/ac3200.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 /* ac3200.c: A driver for the Ansel Communications EISA ethernet adaptor. */
2 /*
3 Written 1993, 1994 by Donald Becker.
4 Copyright 1993 United States Government as represented by the Director,
5 National Security Agency. This software may only be used and distributed
6 according to the terms of the GNU General Public License as modified by SRC,
7 incorporated herein by reference.
9 The author may be reached as becker@scyld.com, or C/O
10 Scyld Computing Corporation
11 410 Severn Ave., Suite 210
12 Annapolis MD 21403
14 This is driver for the Ansel Communications Model 3200 EISA Ethernet LAN
15 Adapter. The programming information is from the users manual, as related
16 by glee@ardnassak.math.clemson.edu.
18 Changelog:
20 Paul Gortmaker 05/98 : add support for shared mem above 1MB.
22 */
24 static const char version[] =
25 "ac3200.c:v1.01 7/1/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
27 #include <linux/module.h>
28 #include <linux/eisa.h>
29 #include <linux/kernel.h>
30 #include <linux/errno.h>
31 #include <linux/string.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/init.h>
36 #include <asm/system.h>
37 #include <asm/io.h>
38 #include <asm/irq.h>
40 #include "8390.h"
42 #define DRV_NAME "ac3200"
44 /* Offsets from the base address. */
45 #define AC_NIC_BASE 0x00
46 #define AC_SA_PROM 0x16 /* The station address PROM. */
47 #define AC_ADDR0 0x00 /* Prefix station address values. */
48 #define AC_ADDR1 0x40
49 #define AC_ADDR2 0x90
50 #define AC_ID_PORT 0xC80
51 #define AC_EISA_ID 0x0110d305
52 #define AC_RESET_PORT 0xC84
53 #define AC_RESET 0x00
54 #define AC_ENABLE 0x01
55 #define AC_CONFIG 0xC90 /* The configuration port. */
57 #define AC_IO_EXTENT 0x20
58 /* Actually accessed is:
59 * AC_NIC_BASE (0-15)
60 * AC_SA_PROM (0-5)
61 * AC_ID_PORT (0-3)
62 * AC_RESET_PORT
63 * AC_CONFIG
64 */
66 /* Decoding of the configuration register. */
67 static unsigned char config2irqmap[8] __initdata = {15, 12, 11, 10, 9, 7, 5, 3};
68 static int addrmap[8] =
69 {0xFF0000, 0xFE0000, 0xFD0000, 0xFFF0000, 0xFFE0000, 0xFFC0000, 0xD0000, 0 };
70 static const char *port_name[4] = { "10baseT", "invalid", "AUI", "10base2"};
72 #define config2irq(configval) config2irqmap[((configval) >> 3) & 7]
73 #define config2mem(configval) addrmap[(configval) & 7]
74 #define config2name(configval) port_name[((configval) >> 6) & 3]
76 /* First and last 8390 pages. */
77 #define AC_START_PG 0x00 /* First page of 8390 TX buffer */
78 #define AC_STOP_PG 0x80 /* Last page +1 of the 8390 RX ring */
80 static int ac_probe1(int ioaddr, struct net_device *dev);
82 static int ac_open(struct net_device *dev);
83 static void ac_reset_8390(struct net_device *dev);
84 static void ac_block_input(struct net_device *dev, int count,
85 struct sk_buff *skb, int ring_offset);
86 static void ac_block_output(struct net_device *dev, const int count,
87 const unsigned char *buf, const int start_page);
88 static void ac_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
89 int ring_page);
91 static int ac_close_card(struct net_device *dev);
94 /* Probe for the AC3200.
96 The AC3200 can be identified by either the EISA configuration registers,
97 or the unique value in the station address PROM.
98 */
100 static int __init do_ac3200_probe(struct net_device *dev)
101 {
102 unsigned short ioaddr = dev->base_addr;
103 int irq = dev->irq;
104 int mem_start = dev->mem_start;
106 SET_MODULE_OWNER(dev);
108 if (ioaddr > 0x1ff) /* Check a single specified location. */
109 return ac_probe1(ioaddr, dev);
110 else if (ioaddr > 0) /* Don't probe at all. */
111 return -ENXIO;
113 if ( ! EISA_bus)
114 return -ENXIO;
116 for (ioaddr = 0x1000; ioaddr < 0x9000; ioaddr += 0x1000) {
117 if (ac_probe1(ioaddr, dev) == 0)
118 return 0;
119 dev->irq = irq;
120 dev->mem_start = mem_start;
121 }
123 return -ENODEV;
124 }
126 #ifndef MODULE
127 struct net_device * __init ac3200_probe(int unit)
128 {
129 struct net_device *dev = alloc_ei_netdev();
130 int err;
132 if (!dev)
133 return ERR_PTR(-ENOMEM);
135 sprintf(dev->name, "eth%d", unit);
136 netdev_boot_setup_check(dev);
138 err = do_ac3200_probe(dev);
139 if (err)
140 goto out;
141 return dev;
142 out:
143 free_netdev(dev);
144 return ERR_PTR(err);
145 }
146 #endif
148 static int __init ac_probe1(int ioaddr, struct net_device *dev)
149 {
150 int i, retval;
152 if (!request_region(ioaddr, AC_IO_EXTENT, DRV_NAME))
153 return -EBUSY;
155 if (inb_p(ioaddr + AC_ID_PORT) == 0xff) {
156 retval = -ENODEV;
157 goto out;
158 }
160 if (inl(ioaddr + AC_ID_PORT) != AC_EISA_ID) {
161 retval = -ENODEV;
162 goto out;
163 }
165 #ifndef final_version
166 printk(KERN_DEBUG "AC3200 ethercard configuration register is %#02x,"
167 " EISA ID %02x %02x %02x %02x.\n", inb(ioaddr + AC_CONFIG),
168 inb(ioaddr + AC_ID_PORT + 0), inb(ioaddr + AC_ID_PORT + 1),
169 inb(ioaddr + AC_ID_PORT + 2), inb(ioaddr + AC_ID_PORT + 3));
170 #endif
172 printk("AC3200 in EISA slot %d, node", ioaddr/0x1000);
173 for(i = 0; i < 6; i++)
174 printk(" %02x", dev->dev_addr[i] = inb(ioaddr + AC_SA_PROM + i));
176 #if 0
177 /* Check the vendor ID/prefix. Redundant after checking the EISA ID */
178 if (inb(ioaddr + AC_SA_PROM + 0) != AC_ADDR0
179 || inb(ioaddr + AC_SA_PROM + 1) != AC_ADDR1
180 || inb(ioaddr + AC_SA_PROM + 2) != AC_ADDR2 ) {
181 printk(", not found (invalid prefix).\n");
182 retval = -ENODEV;
183 goto out;
184 }
185 #endif
187 /* Assign and allocate the interrupt now. */
188 if (dev->irq == 0) {
189 dev->irq = config2irq(inb(ioaddr + AC_CONFIG));
190 printk(", using");
191 } else {
192 dev->irq = irq_canonicalize(dev->irq);
193 printk(", assigning");
194 }
196 retval = request_irq(dev->irq, ei_interrupt, 0, DRV_NAME, dev);
197 if (retval) {
198 printk (" nothing! Unable to get IRQ %d.\n", dev->irq);
199 goto out1;
200 }
202 printk(" IRQ %d, %s port\n", dev->irq, port_name[dev->if_port]);
204 dev->base_addr = ioaddr;
206 #ifdef notyet
207 if (dev->mem_start) { /* Override the value from the board. */
208 for (i = 0; i < 7; i++)
209 if (addrmap[i] == dev->mem_start)
210 break;
211 if (i >= 7)
212 i = 0;
213 outb((inb(ioaddr + AC_CONFIG) & ~7) | i, ioaddr + AC_CONFIG);
214 }
215 #endif
217 dev->if_port = inb(ioaddr + AC_CONFIG) >> 6;
218 dev->mem_start = config2mem(inb(ioaddr + AC_CONFIG));
220 printk("%s: AC3200 at %#3x with %dkB memory at physical address %#lx.\n",
221 dev->name, ioaddr, AC_STOP_PG/4, dev->mem_start);
223 /*
224 * BEWARE!! Some dain-bramaged EISA SCUs will allow you to put
225 * the card mem within the region covered by `normal' RAM !!!
226 *
227 * ioremap() will fail in that case.
228 */
229 ei_status.mem = ioremap(dev->mem_start, AC_STOP_PG*0x100);
230 if (!ei_status.mem) {
231 printk(KERN_ERR "ac3200.c: Unable to remap card memory above 1MB !!\n");
232 printk(KERN_ERR "ac3200.c: Try using EISA SCU to set memory below 1MB.\n");
233 printk(KERN_ERR "ac3200.c: Driver NOT installed.\n");
234 retval = -EINVAL;
235 goto out1;
236 }
237 printk("ac3200.c: remapped %dkB card memory to virtual address %p\n",
238 AC_STOP_PG/4, ei_status.mem);
240 dev->mem_start = (unsigned long)ei_status.mem;
241 dev->mem_end = dev->mem_start + (AC_STOP_PG - AC_START_PG)*256;
243 ei_status.name = "AC3200";
244 ei_status.tx_start_page = AC_START_PG;
245 ei_status.rx_start_page = AC_START_PG + TX_PAGES;
246 ei_status.stop_page = AC_STOP_PG;
247 ei_status.word16 = 1;
249 if (ei_debug > 0)
250 printk(version);
252 ei_status.reset_8390 = &ac_reset_8390;
253 ei_status.block_input = &ac_block_input;
254 ei_status.block_output = &ac_block_output;
255 ei_status.get_8390_hdr = &ac_get_8390_hdr;
257 dev->open = &ac_open;
258 dev->stop = &ac_close_card;
259 #ifdef CONFIG_NET_POLL_CONTROLLER
260 dev->poll_controller = ei_poll;
261 #endif
262 NS8390_init(dev, 0);
264 retval = register_netdev(dev);
265 if (retval)
266 goto out2;
267 return 0;
268 out2:
269 if (ei_status.reg0)
270 iounmap(ei_status.mem);
271 out1:
272 free_irq(dev->irq, dev);
273 out:
274 release_region(ioaddr, AC_IO_EXTENT);
275 return retval;
276 }
278 static int ac_open(struct net_device *dev)
279 {
280 #ifdef notyet
281 /* Someday we may enable the IRQ and shared memory here. */
282 int ioaddr = dev->base_addr;
283 #endif
285 ei_open(dev);
286 return 0;
287 }
289 static void ac_reset_8390(struct net_device *dev)
290 {
291 ushort ioaddr = dev->base_addr;
293 outb(AC_RESET, ioaddr + AC_RESET_PORT);
294 if (ei_debug > 1) printk("resetting AC3200, t=%ld...", jiffies);
296 ei_status.txing = 0;
297 outb(AC_ENABLE, ioaddr + AC_RESET_PORT);
298 if (ei_debug > 1) printk("reset done\n");
300 return;
301 }
303 /* Grab the 8390 specific header. Similar to the block_input routine, but
304 we don't need to be concerned with ring wrap as the header will be at
305 the start of a page, so we optimize accordingly. */
307 static void
308 ac_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
309 {
310 void __iomem *hdr_start = ei_status.mem + ((ring_page - AC_START_PG)<<8);
311 memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
312 }
314 /* Block input and output are easy on shared memory ethercards, the only
315 complication is when the ring buffer wraps. */
317 static void ac_block_input(struct net_device *dev, int count, struct sk_buff *skb,
318 int ring_offset)
319 {
320 void __iomem *start = ei_status.mem + ring_offset - AC_START_PG*256;
322 if (ring_offset + count > AC_STOP_PG*256) {
323 /* We must wrap the input move. */
324 int semi_count = AC_STOP_PG*256 - ring_offset;
325 memcpy_fromio(skb->data, start, semi_count);
326 count -= semi_count;
327 memcpy_fromio(skb->data + semi_count,
328 ei_status.mem + TX_PAGES*256, count);
329 } else {
330 /* Packet is in one chunk -- we can copy + cksum. */
331 eth_io_copy_and_sum(skb, start, count, 0);
332 }
333 }
335 static void ac_block_output(struct net_device *dev, int count,
336 const unsigned char *buf, int start_page)
337 {
338 void __iomem *shmem = ei_status.mem + ((start_page - AC_START_PG)<<8);
340 memcpy_toio(shmem, buf, count);
341 }
343 static int ac_close_card(struct net_device *dev)
344 {
345 if (ei_debug > 1)
346 printk("%s: Shutting down ethercard.\n", dev->name);
348 #ifdef notyet
349 /* We should someday disable shared memory and interrupts. */
350 outb(0x00, ioaddr + 6); /* Disable interrupts. */
351 free_irq(dev->irq, dev);
352 #endif
354 ei_close(dev);
355 return 0;
356 }
358 #ifdef MODULE
359 #define MAX_AC32_CARDS 4 /* Max number of AC32 cards per module */
360 static struct net_device *dev_ac32[MAX_AC32_CARDS];
361 static int io[MAX_AC32_CARDS];
362 static int irq[MAX_AC32_CARDS];
363 static int mem[MAX_AC32_CARDS];
364 module_param_array(io, int, NULL, 0);
365 module_param_array(irq, int, NULL, 0);
366 module_param_array(mem, int, NULL, 0);
367 MODULE_PARM_DESC(io, "I/O base address(es)");
368 MODULE_PARM_DESC(irq, "IRQ number(s)");
369 MODULE_PARM_DESC(mem, "Memory base address(es)");
370 MODULE_DESCRIPTION("Ansel AC3200 EISA ethernet driver");
371 MODULE_LICENSE("GPL");
373 int __init init_module(void)
374 {
375 struct net_device *dev;
376 int this_dev, found = 0;
378 for (this_dev = 0; this_dev < MAX_AC32_CARDS; this_dev++) {
379 if (io[this_dev] == 0 && this_dev != 0)
380 break;
381 dev = alloc_ei_netdev();
382 if (!dev)
383 break;
384 dev->irq = irq[this_dev];
385 dev->base_addr = io[this_dev];
386 dev->mem_start = mem[this_dev]; /* Currently ignored by driver */
387 if (do_ac3200_probe(dev) == 0) {
388 dev_ac32[found++] = dev;
389 continue;
390 }
391 free_netdev(dev);
392 printk(KERN_WARNING "ac3200.c: No ac3200 card found (i/o = 0x%x).\n", io[this_dev]);
393 break;
394 }
395 if (found)
396 return 0;
397 return -ENXIO;
398 }
400 static void cleanup_card(struct net_device *dev)
401 {
402 /* Someday free_irq may be in ac_close_card() */
403 free_irq(dev->irq, dev);
404 release_region(dev->base_addr, AC_IO_EXTENT);
405 iounmap(ei_status.mem);
406 }
408 void
409 cleanup_module(void)
410 {
411 int this_dev;
413 for (this_dev = 0; this_dev < MAX_AC32_CARDS; this_dev++) {
414 struct net_device *dev = dev_ac32[this_dev];
415 if (dev) {
416 unregister_netdev(dev);
417 cleanup_card(dev);
418 free_netdev(dev);
419 }
420 }
421 }
422 #endif /* MODULE */