ia64/linux-2.6.18-xen.hg

view drivers/ieee1394/hosts.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*
2 * IEEE 1394 for Linux
3 *
4 * Low level (host adapter) management.
5 *
6 * Copyright (C) 1999 Andreas E. Bombe
7 * Copyright (C) 1999 Emanuel Pirker
8 *
9 * This code is licensed under the GPL. See the file COPYING in the root
10 * directory of the kernel sources for details.
11 */
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/list.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/pci.h>
19 #include <linux/timer.h>
20 #include <linux/jiffies.h>
21 #include <linux/mutex.h>
23 #include "csr1212.h"
24 #include "ieee1394.h"
25 #include "ieee1394_types.h"
26 #include "hosts.h"
27 #include "ieee1394_core.h"
28 #include "highlevel.h"
29 #include "nodemgr.h"
30 #include "csr.h"
31 #include "config_roms.h"
34 static void delayed_reset_bus(void * __reset_info)
35 {
36 struct hpsb_host *host = (struct hpsb_host*)__reset_info;
37 int generation = host->csr.generation + 1;
39 /* The generation field rolls over to 2 rather than 0 per IEEE
40 * 1394a-2000. */
41 if (generation > 0xf || generation < 2)
42 generation = 2;
44 CSR_SET_BUS_INFO_GENERATION(host->csr.rom, generation);
45 if (csr1212_generate_csr_image(host->csr.rom) != CSR1212_SUCCESS) {
46 /* CSR image creation failed, reset generation field and do not
47 * issue a bus reset. */
48 CSR_SET_BUS_INFO_GENERATION(host->csr.rom, host->csr.generation);
49 return;
50 }
52 host->csr.generation = generation;
54 host->update_config_rom = 0;
55 if (host->driver->set_hw_config_rom)
56 host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);
58 host->csr.gen_timestamp[host->csr.generation] = jiffies;
59 hpsb_reset_bus(host, SHORT_RESET);
60 }
62 static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p)
63 {
64 return 0;
65 }
67 static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
68 {
69 return -1;
70 }
72 static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, unsigned long arg)
73 {
74 return -1;
75 }
77 static struct hpsb_host_driver dummy_driver = {
78 .transmit_packet = dummy_transmit_packet,
79 .devctl = dummy_devctl,
80 .isoctl = dummy_isoctl
81 };
83 static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
84 {
85 int *hostnum = __data;
87 if (host->id == *hostnum)
88 return 1;
90 return 0;
91 }
93 /**
94 * hpsb_alloc_host - allocate a new host controller.
95 * @drv: the driver that will manage the host controller
96 * @extra: number of extra bytes to allocate for the driver
97 *
98 * Allocate a &hpsb_host and initialize the general subsystem specific
99 * fields. If the driver needs to store per host data, as drivers
100 * usually do, the amount of memory required can be specified by the
101 * @extra parameter. Once allocated, the driver should initialize the
102 * driver specific parts, enable the controller and make it available
103 * to the general subsystem using hpsb_add_host().
104 *
105 * Return Value: a pointer to the &hpsb_host if successful, %NULL if
106 * no memory was available.
107 */
108 static DEFINE_MUTEX(host_num_alloc);
110 /*
111 * The pending_packet_queue is special in that it's processed
112 * from hardirq context too (such as hpsb_bus_reset()). Hence
113 * split the lock class from the usual networking skb-head
114 * lock class by using a separate key for it:
115 */
116 static struct lock_class_key pending_packet_queue_key;
118 struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
119 struct device *dev)
120 {
121 struct hpsb_host *h;
122 int i;
123 int hostnum = 0;
125 h = kzalloc(sizeof(*h) + extra, SLAB_KERNEL);
126 if (!h)
127 return NULL;
129 h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h);
130 if (!h->csr.rom) {
131 kfree(h);
132 return NULL;
133 }
135 h->hostdata = h + 1;
136 h->driver = drv;
138 skb_queue_head_init(&h->pending_packet_queue);
139 lockdep_set_class(&h->pending_packet_queue.lock,
140 &pending_packet_queue_key);
141 INIT_LIST_HEAD(&h->addr_space);
143 for (i = 2; i < 16; i++)
144 h->csr.gen_timestamp[i] = jiffies - 60 * HZ;
146 for (i = 0; i < ARRAY_SIZE(h->tpool); i++)
147 HPSB_TPOOL_INIT(&h->tpool[i]);
149 atomic_set(&h->generation, 0);
151 INIT_WORK(&h->delayed_reset, delayed_reset_bus, h);
153 init_timer(&h->timeout);
154 h->timeout.data = (unsigned long) h;
155 h->timeout.function = abort_timedouts;
156 h->timeout_interval = HZ / 20; // 50ms by default
158 h->topology_map = h->csr.topology_map + 3;
159 h->speed_map = (u8 *)(h->csr.speed_map + 2);
161 mutex_lock(&host_num_alloc);
163 while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
164 hostnum++;
166 h->id = hostnum;
168 memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
169 h->device.parent = dev;
170 snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
172 h->class_dev.dev = &h->device;
173 h->class_dev.class = &hpsb_host_class;
174 snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id);
176 device_register(&h->device);
177 class_device_register(&h->class_dev);
178 get_device(&h->device);
180 mutex_unlock(&host_num_alloc);
182 return h;
183 }
185 int hpsb_add_host(struct hpsb_host *host)
186 {
187 if (hpsb_default_host_entry(host))
188 return -ENOMEM;
190 hpsb_add_extra_config_roms(host);
192 highlevel_add_host(host);
194 return 0;
195 }
197 void hpsb_remove_host(struct hpsb_host *host)
198 {
199 host->is_shutdown = 1;
201 cancel_delayed_work(&host->delayed_reset);
202 flush_scheduled_work();
204 host->driver = &dummy_driver;
206 highlevel_remove_host(host);
208 hpsb_remove_extra_config_roms(host);
210 class_device_unregister(&host->class_dev);
211 device_unregister(&host->device);
212 }
214 int hpsb_update_config_rom_image(struct hpsb_host *host)
215 {
216 unsigned long reset_delay;
217 int next_gen = host->csr.generation + 1;
219 if (!host->update_config_rom)
220 return -EINVAL;
222 if (next_gen > 0xf)
223 next_gen = 2;
225 /* Stop the delayed interrupt, we're about to change the config rom and
226 * it would be a waste to do a bus reset twice. */
227 cancel_delayed_work(&host->delayed_reset);
229 /* IEEE 1394a-2000 prohibits using the same generation number
230 * twice in a 60 second period. */
231 if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ))
232 /* Wait 60 seconds from the last time this generation number was
233 * used. */
234 reset_delay = (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
235 else
236 /* Wait 1 second in case some other code wants to change the
237 * Config ROM in the near future. */
238 reset_delay = HZ;
240 PREPARE_WORK(&host->delayed_reset, delayed_reset_bus, host);
241 schedule_delayed_work(&host->delayed_reset, reset_delay);
243 return 0;
244 }