acpiphp_glue.c 44.4 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6
/*
 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
 *
 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
 * Copyright (C) 2002,2003 NEC Corporation
7 8
 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
 * Copyright (C) 2003-2005 Hewlett Packard
9 10
 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
 * Copyright (C) 2005 Intel Corporation
L
Linus Torvalds 已提交
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
29
 * Send feedback to <kristen.c.accardi@intel.com>
L
Linus Torvalds 已提交
30 31 32
 *
 */

33 34 35 36 37 38 39 40 41 42
/*
 * Lifetime rules for pci_dev:
 *  - The one in acpiphp_func has its refcount elevated by pci_get_slot()
 *    when the driver is loaded or when an insertion event occurs.  It loses
 *    a refcount when its ejected or the driver unloads.
 *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
 *    when the bridge is scanned and it loses a refcount when the bridge
 *    is removed.
 */

L
Linus Torvalds 已提交
43 44 45 46 47
#include <linux/init.h>
#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/pci.h>
48
#include <linux/pci_hotplug.h>
49
#include <linux/mutex.h>
L
Linus Torvalds 已提交
50 51 52 53 54

#include "../pci.h"
#include "acpiphp.h"

static LIST_HEAD(bridge_list);
55 56
static LIST_HEAD(ioapic_list);
static DEFINE_SPINLOCK(ioapic_list_lock);
L
Linus Torvalds 已提交
57 58 59 60

#define MY_NAME "acpiphp_glue"

static void handle_hotplug_event_bridge (acpi_handle, u32, void *);
61 62
static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
63
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
64

L
Linus Torvalds 已提交
65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104

/*
 * initialization & terminatation routines
 */

/**
 * is_ejectable - determine if a slot is ejectable
 * @handle: handle to acpi namespace
 *
 * Ejectable slot should satisfy at least these conditions:
 *
 *  1. has _ADR method
 *  2. has _EJ0 method
 *
 * optionally
 *
 *  1. has _STA method
 *  2. has _PS0 method
 *  3. has _PS3 method
 *  4. ..
 */
static int is_ejectable(acpi_handle handle)
{
	acpi_status status;
	acpi_handle tmp;

	status = acpi_get_handle(handle, "_ADR", &tmp);
	if (ACPI_FAILURE(status)) {
		return 0;
	}

	status = acpi_get_handle(handle, "_EJ0", &tmp);
	if (ACPI_FAILURE(status)) {
		return 0;
	}

	return 1;
}


105
/* callback routine to check for the existence of ejectable slots */
L
Linus Torvalds 已提交
106 107 108 109 110 111 112 113 114 115 116 117 118 119
static acpi_status
is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int *count = (int *)context;

	if (is_ejectable(handle)) {
		(*count)++;
		/* only one ejectable slot is enough */
		return AE_CTRL_TERMINATE;
	} else {
		return AE_OK;
	}
}

120
/* callback routine to check for the existence of a pci dock device */
K
Kristen Accardi 已提交
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
static acpi_status
is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int *count = (int *)context;

	if (is_dock_device(handle)) {
		(*count)++;
		return AE_CTRL_TERMINATE;
	} else {
		return AE_OK;
	}
}




/*
 * the _DCK method can do funny things... and sometimes not
 * hah-hah funny.
 *
 * TBD - figure out a way to only call fixups for
 * systems that require them.
 */
static int post_dock_fixups(struct notifier_block *nb, unsigned long val,
	void *v)
{
	struct acpiphp_func *func = container_of(nb, struct acpiphp_func, nb);
	struct pci_bus *bus = func->slot->bridge->pci_bus;
	u32 buses;

	if (!bus->self)
		return  NOTIFY_OK;

	/* fixup bad _DCK function that rewrites
	 * secondary bridge on slot
	 */
	pci_read_config_dword(bus->self,
			PCI_PRIMARY_BUS,
			&buses);

	if (((buses >> 8) & 0xff) != bus->secondary) {
		buses = (buses & 0xff000000)
	     		| ((unsigned int)(bus->primary)     <<  0)
	     		| ((unsigned int)(bus->secondary)   <<  8)
	     		| ((unsigned int)(bus->subordinate) << 16);
		pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
	}
	return NOTIFY_OK;
}



L
Linus Torvalds 已提交
173 174 175 176 177 178 179 180 181 182 183

/* callback routine to register each ACPI PCI slot object */
static acpi_status
register_slot(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context;
	struct acpiphp_slot *slot;
	struct acpiphp_func *newfunc;
	acpi_handle tmp;
	acpi_status status = AE_OK;
	unsigned long adr, sun;
184
	int device, function, retval;
L
Linus Torvalds 已提交
185 186 187 188 189 190 191 192

	status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);

	if (ACPI_FAILURE(status))
		return AE_OK;

	status = acpi_get_handle(handle, "_EJ0", &tmp);

K
Kristen Accardi 已提交
193
	if (ACPI_FAILURE(status) && !(is_dock_device(handle)))
L
Linus Torvalds 已提交
194 195 196 197 198
		return AE_OK;

	device = (adr >> 16) & 0xffff;
	function = adr & 0xffff;

199
	newfunc = kzalloc(sizeof(struct acpiphp_func), GFP_KERNEL);
L
Linus Torvalds 已提交
200 201 202 203 204 205
	if (!newfunc)
		return AE_NO_MEMORY;

	INIT_LIST_HEAD(&newfunc->sibling);
	newfunc->handle = handle;
	newfunc->function = function;
206 207
	if (ACPI_SUCCESS(status))
		newfunc->flags = FUNC_HAS_EJ0;
L
Linus Torvalds 已提交
208 209 210 211 212 213 214 215 216 217

	if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp)))
		newfunc->flags |= FUNC_HAS_STA;

	if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp)))
		newfunc->flags |= FUNC_HAS_PS0;

	if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp)))
		newfunc->flags |= FUNC_HAS_PS3;

K
Kristen Accardi 已提交
218
	if (ACPI_SUCCESS(acpi_get_handle(handle, "_DCK", &tmp)))
219 220
		newfunc->flags |= FUNC_HAS_DCK;

L
Linus Torvalds 已提交
221
	status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
222 223 224 225 226 227 228
	if (ACPI_FAILURE(status)) {
		/*
		 * use the count of the number of slots we've found
		 * for the number of the slot
		 */
		sun = bridge->nr_slots+1;
	}
L
Linus Torvalds 已提交
229 230 231 232 233 234 235 236 237 238

	/* search for objects that share the same slot */
	for (slot = bridge->slots; slot; slot = slot->next)
		if (slot->device == device) {
			if (slot->sun != sun)
				warn("sibling found, but _SUN doesn't match!\n");
			break;
		}

	if (!slot) {
239
		slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
L
Linus Torvalds 已提交
240 241 242 243 244 245 246 247 248
		if (!slot) {
			kfree(newfunc);
			return AE_NO_MEMORY;
		}

		slot->bridge = bridge;
		slot->device = device;
		slot->sun = sun;
		INIT_LIST_HEAD(&slot->funcs);
249
		mutex_init(&slot->crit_sect);
L
Linus Torvalds 已提交
250 251 252 253 254 255

		slot->next = bridge->slots;
		bridge->slots = slot;

		bridge->nr_slots++;

256 257 258
		dbg("found ACPI PCI Hotplug slot %d at PCI %04x:%02x:%02x\n",
				slot->sun, pci_domain_nr(bridge->pci_bus),
				bridge->pci_bus->number, slot->device);
259 260 261 262 263
		retval = acpiphp_register_hotplug_slot(slot);
		if (retval) {
			warn("acpiphp_register_hotplug_slot failed(err code = 0x%x)\n", retval);
			goto err_exit;
		}
L
Linus Torvalds 已提交
264 265 266 267 268 269
	}

	newfunc->slot = slot;
	list_add_tail(&newfunc->sibling, &slot->funcs);

	/* associate corresponding pci_dev */
270
	newfunc->pci_dev = pci_get_slot(bridge->pci_bus,
L
Linus Torvalds 已提交
271 272 273 274 275
					 PCI_DEVFN(device, function));
	if (newfunc->pci_dev) {
		slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON);
	}

K
Kristen Accardi 已提交
276 277 278 279
	if (is_dock_device(handle)) {
		/* we don't want to call this device's _EJ0
		 * because we want the dock notify handler
		 * to call it after it calls _DCK
280 281
		 */
		newfunc->flags &= ~FUNC_HAS_EJ0;
K
Kristen Accardi 已提交
282 283 284 285 286 287 288 289 290 291 292
		if (register_hotplug_dock_device(handle,
			handle_hotplug_event_func, newfunc))
			dbg("failed to register dock device\n");

		/* we need to be notified when dock events happen
		 * outside of the hotplug operation, since we may
		 * need to do fixups before we can hotplug.
		 */
		newfunc->nb.notifier_call = post_dock_fixups;
		if (register_dock_notifier(&newfunc->nb))
			dbg("failed to register a dock notifier");
293 294
	}

L
Linus Torvalds 已提交
295
	/* install notify handler */
296 297
	if (!(newfunc->flags & FUNC_HAS_DCK)) {
		status = acpi_install_notify_handler(handle,
L
Linus Torvalds 已提交
298 299 300 301
					     ACPI_SYSTEM_NOTIFY,
					     handle_hotplug_event_func,
					     newfunc);

302 303 304 305
		if (ACPI_FAILURE(status))
			err("failed to register interrupt notify handler\n");
	} else
		status = AE_OK;
L
Linus Torvalds 已提交
306

307
	return status;
308 309 310 311 312 313 314 315

 err_exit:
	bridge->nr_slots--;
	bridge->slots = slot->next;
	kfree(slot);
	kfree(newfunc);

	return AE_OK;
L
Linus Torvalds 已提交
316 317 318 319 320 321 322 323 324 325 326 327 328 329 330
}


/* see if it's worth looking at this bridge */
static int detect_ejectable_slots(acpi_handle *bridge_handle)
{
	acpi_status status;
	int count;

	count = 0;

	/* only check slots defined directly below bridge object */
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1,
				     is_ejectable_slot, (void *)&count, NULL);

K
Kristen Accardi 已提交
331 332 333 334 335 336 337 338 339
	/*
	 * we also need to add this bridge if there is a dock bridge or
	 * other pci device on a dock station (removable)
	 */
	if (!count)
		status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle,
				(u32)1, is_pci_dock_device, (void *)&count,
				NULL);

L
Linus Torvalds 已提交
340 341 342 343 344 345 346 347 348
	return count;
}


/* decode ACPI 2.0 _HPP hot plug parameters */
static void decode_hpp(struct acpiphp_bridge *bridge)
{
	acpi_status status;

349
	status = acpi_get_hp_params_from_firmware(bridge->pci_bus, &bridge->hpp);
350 351
	if (ACPI_FAILURE(status) ||
	    !bridge->hpp.t0 || (bridge->hpp.t0->revision > 1)) {
352
		/* use default numbers */
353 354 355 356 357 358 359 360 361
		printk(KERN_WARNING
		       "%s: Could not get hotplug parameters. Use defaults\n",
		       __FUNCTION__);
		bridge->hpp.t0 = &bridge->hpp.type0_data;
		bridge->hpp.t0->revision = 0;
		bridge->hpp.t0->cache_line_size = 0x10;
		bridge->hpp.t0->latency_timer = 0x40;
		bridge->hpp.t0->enable_serr = 0;
		bridge->hpp.t0->enable_perr = 0;
L
Linus Torvalds 已提交
362 363 364 365
	}
}


366

L
Linus Torvalds 已提交
367 368 369 370 371 372 373 374
/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
static void init_bridge_misc(struct acpiphp_bridge *bridge)
{
	acpi_status status;

	/* decode ACPI 2.0 _HPP (hot plug parameters) */
	decode_hpp(bridge);

375 376 377
	/* must be added to the list prior to calling register_slot */
	list_add(&bridge->list, &bridge_list);

L
Linus Torvalds 已提交
378 379 380
	/* register all slot objects under this bridge */
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
				     register_slot, bridge, NULL);
381 382 383 384
	if (ACPI_FAILURE(status)) {
		list_del(&bridge->list);
		return;
	}
L
Linus Torvalds 已提交
385 386

	/* install notify handler */
387
	if (bridge->type != BRIDGE_TYPE_HOST) {
388 389 390 391 392 393 394
		if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
			status = acpi_remove_notify_handler(bridge->func->handle,
						ACPI_SYSTEM_NOTIFY,
						handle_hotplug_event_func);
			if (ACPI_FAILURE(status))
				err("failed to remove notify handler\n");
		}
395
		status = acpi_install_notify_handler(bridge->handle,
L
Linus Torvalds 已提交
396 397 398 399
					     ACPI_SYSTEM_NOTIFY,
					     handle_hotplug_event_bridge,
					     bridge);

400 401 402
		if (ACPI_FAILURE(status)) {
			err("failed to register interrupt notify handler\n");
		}
L
Linus Torvalds 已提交
403 404 405 406
	}
}


407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466
/* find acpiphp_func from acpiphp_bridge */
static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
{
	struct list_head *node, *l;
	struct acpiphp_bridge *bridge;
	struct acpiphp_slot *slot;
	struct acpiphp_func *func;

	list_for_each(node, &bridge_list) {
		bridge = list_entry(node, struct acpiphp_bridge, list);
		for (slot = bridge->slots; slot; slot = slot->next) {
			list_for_each(l, &slot->funcs) {
				func = list_entry(l, struct acpiphp_func,
							sibling);
				if (func->handle == handle)
					return func;
			}
		}
	}

	return NULL;
}


static inline void config_p2p_bridge_flags(struct acpiphp_bridge *bridge)
{
	acpi_handle dummy_handle;

	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
					"_STA", &dummy_handle)))
		bridge->flags |= BRIDGE_HAS_STA;

	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
					"_EJ0", &dummy_handle)))
		bridge->flags |= BRIDGE_HAS_EJ0;

	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
					"_PS0", &dummy_handle)))
		bridge->flags |= BRIDGE_HAS_PS0;

	if (ACPI_SUCCESS(acpi_get_handle(bridge->handle,
					"_PS3", &dummy_handle)))
		bridge->flags |= BRIDGE_HAS_PS3;

	/* is this ejectable p2p bridge? */
	if (bridge->flags & BRIDGE_HAS_EJ0) {
		struct acpiphp_func *func;

		dbg("found ejectable p2p bridge\n");

		/* make link between PCI bridge and PCI function */
		func = acpiphp_bridge_handle_to_function(bridge->handle);
		if (!func)
			return;
		bridge->func = func;
		func->bridge = bridge;
	}
}


L
Linus Torvalds 已提交
467
/* allocate and initialize host bridge data structure */
468
static void add_host_bridge(acpi_handle *handle, struct pci_bus *pci_bus)
L
Linus Torvalds 已提交
469 470 471
{
	struct acpiphp_bridge *bridge;

472
	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
L
Linus Torvalds 已提交
473 474 475 476 477 478
	if (bridge == NULL)
		return;

	bridge->type = BRIDGE_TYPE_HOST;
	bridge->handle = handle;

479
	bridge->pci_bus = pci_bus;
L
Linus Torvalds 已提交
480 481 482 483 484 485 486 487

	spin_lock_init(&bridge->res_lock);

	init_bridge_misc(bridge);
}


/* allocate and initialize PCI-to-PCI bridge data structure */
488
static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
L
Linus Torvalds 已提交
489 490 491
{
	struct acpiphp_bridge *bridge;

492
	bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
L
Linus Torvalds 已提交
493 494 495 496 497 498 499
	if (bridge == NULL) {
		err("out of memory\n");
		return;
	}

	bridge->type = BRIDGE_TYPE_P2P;
	bridge->handle = handle;
500
	config_p2p_bridge_flags(bridge);
L
Linus Torvalds 已提交
501

502 503
	bridge->pci_dev = pci_dev_get(pci_dev);
	bridge->pci_bus = pci_dev->subordinate;
L
Linus Torvalds 已提交
504 505
	if (!bridge->pci_bus) {
		err("This is not a PCI-to-PCI bridge!\n");
506
		goto err;
L
Linus Torvalds 已提交
507 508 509 510 511
	}

	spin_lock_init(&bridge->res_lock);

	init_bridge_misc(bridge);
512 513 514 515 516
	return;
 err:
	pci_dev_put(pci_dev);
	kfree(bridge);
	return;
L
Linus Torvalds 已提交
517 518 519 520 521 522 523 524 525 526
}


/* callback routine to find P2P bridges */
static acpi_status
find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	acpi_status status;
	acpi_handle dummy_handle;
	unsigned long tmp;
527
	int device, function;
L
Linus Torvalds 已提交
528
	struct pci_dev *dev;
529
	struct pci_bus *pci_bus = context;
L
Linus Torvalds 已提交
530 531 532 533 534 535 536 537 538 539 540 541 542 543

	status = acpi_get_handle(handle, "_ADR", &dummy_handle);
	if (ACPI_FAILURE(status))
		return AE_OK;		/* continue */

	status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp);
	if (ACPI_FAILURE(status)) {
		dbg("%s: _ADR evaluation failure\n", __FUNCTION__);
		return AE_OK;
	}

	device = (tmp >> 16) & 0xffff;
	function = tmp & 0xffff;

544
	dev = pci_get_slot(pci_bus, PCI_DEVFN(device, function));
L
Linus Torvalds 已提交
545

546 547
	if (!dev || !dev->subordinate)
		goto out;
L
Linus Torvalds 已提交
548 549

	/* check if this bridge has ejectable slots */
K
Kristen Accardi 已提交
550
	if ((detect_ejectable_slots(handle) > 0)) {
L
Linus Torvalds 已提交
551
		dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev));
552
		add_p2p_bridge(handle, dev);
L
Linus Torvalds 已提交
553 554
	}

555 556 557 558
	/* search P2P bridges under this p2p bridge */
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
				     find_p2p_bridge, dev->subordinate, NULL);
	if (ACPI_FAILURE(status))
559
		warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
560

561 562
 out:
	pci_dev_put(dev);
L
Linus Torvalds 已提交
563 564 565 566 567 568 569 570 571 572 573
	return AE_OK;
}


/* find hot-pluggable slots, and then find P2P bridge */
static int add_bridge(acpi_handle handle)
{
	acpi_status status;
	unsigned long tmp;
	int seg, bus;
	acpi_handle dummy_handle;
574
	struct pci_bus *pci_bus;
L
Linus Torvalds 已提交
575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603

	/* if the bridge doesn't have _STA, we assume it is always there */
	status = acpi_get_handle(handle, "_STA", &dummy_handle);
	if (ACPI_SUCCESS(status)) {
		status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp);
		if (ACPI_FAILURE(status)) {
			dbg("%s: _STA evaluation failure\n", __FUNCTION__);
			return 0;
		}
		if ((tmp & ACPI_STA_FUNCTIONING) == 0)
			/* don't register this object */
			return 0;
	}

	/* get PCI segment number */
	status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp);

	seg = ACPI_SUCCESS(status) ? tmp : 0;

	/* get PCI bus number */
	status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp);

	if (ACPI_SUCCESS(status)) {
		bus = tmp;
	} else {
		warn("can't get bus number, assuming 0\n");
		bus = 0;
	}

604 605 606 607 608 609
	pci_bus = pci_find_bus(seg, bus);
	if (!pci_bus) {
		err("Can't find bus %04x:%02x\n", seg, bus);
		return 0;
	}

L
Linus Torvalds 已提交
610 611 612
	/* check if this bridge has ejectable slots */
	if (detect_ejectable_slots(handle) > 0) {
		dbg("found PCI host-bus bridge with hot-pluggable slots\n");
613
		add_host_bridge(handle, pci_bus);
L
Linus Torvalds 已提交
614 615 616 617
	}

	/* search P2P bridges under this host bridge */
	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
618
				     find_p2p_bridge, pci_bus, NULL);
L
Linus Torvalds 已提交
619 620

	if (ACPI_FAILURE(status))
621
		warn("find_p2p_bridge failed (error code = 0x%x)\n", status);
L
Linus Torvalds 已提交
622 623 624 625

	return 0;
}

626 627 628 629 630 631 632 633 634 635 636 637
static struct acpiphp_bridge *acpiphp_handle_to_bridge(acpi_handle handle)
{
	struct list_head *head;
	list_for_each(head, &bridge_list) {
		struct acpiphp_bridge *bridge = list_entry(head,
						struct acpiphp_bridge, list);
		if (bridge->handle == handle)
			return bridge;
	}

	return NULL;
}
L
Linus Torvalds 已提交
638

639
static void cleanup_bridge(struct acpiphp_bridge *bridge)
L
Linus Torvalds 已提交
640
{
641 642 643
	struct list_head *list, *tmp;
	struct acpiphp_slot *slot;
	acpi_status status;
644
	acpi_handle handle = bridge->handle;
645 646 647 648 649 650

	status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
					    handle_hotplug_event_bridge);
	if (ACPI_FAILURE(status))
		err("failed to remove notify handler\n");

651 652 653 654 655 656 657 658 659 660
	if ((bridge->type != BRIDGE_TYPE_HOST) &&
	    ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
		status = acpi_install_notify_handler(bridge->func->handle,
						ACPI_SYSTEM_NOTIFY,
						handle_hotplug_event_func,
						bridge->func);
		if (ACPI_FAILURE(status))
			err("failed to install interrupt notify handler\n");
	}

661 662 663 664 665 666
	slot = bridge->slots;
	while (slot) {
		struct acpiphp_slot *next = slot->next;
		list_for_each_safe (list, tmp, &slot->funcs) {
			struct acpiphp_func *func;
			func = list_entry(list, struct acpiphp_func, sibling);
K
Kristen Accardi 已提交
667 668 669 670
			if (is_dock_device(func->handle)) {
				unregister_hotplug_dock_device(func->handle);
				unregister_dock_notifier(&func->nb);
			}
671 672
			if (!(func->flags & FUNC_HAS_DCK)) {
				status = acpi_remove_notify_handler(func->handle,
673 674
						ACPI_SYSTEM_NOTIFY,
						handle_hotplug_event_func);
675 676 677
				if (ACPI_FAILURE(status))
					err("failed to remove notify handler\n");
			}
678 679 680 681
			pci_dev_put(func->pci_dev);
			list_del(list);
			kfree(func);
		}
682 683
		acpiphp_unregister_hotplug_slot(slot);
		list_del(&slot->funcs);
684 685 686 687 688 689 690
		kfree(slot);
		slot = next;
	}

	pci_dev_put(bridge->pci_dev);
	list_del(&bridge->list);
	kfree(bridge);
L
Linus Torvalds 已提交
691 692
}

693 694 695 696 697
static acpi_status
cleanup_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpiphp_bridge *bridge;

698 699 700 701 702
	/* cleanup p2p bridges under this P2P bridge
	   in a depth-first manner */
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
				cleanup_p2p_bridge, NULL, NULL);

703 704 705 706 707 708 709 710 711 712
	if (!(bridge = acpiphp_handle_to_bridge(handle)))
		return AE_OK;
	cleanup_bridge(bridge);
	return AE_OK;
}

static void remove_bridge(acpi_handle handle)
{
	struct acpiphp_bridge *bridge;

713 714 715 716 717
	/* cleanup p2p bridges under this host bridge
	   in a depth-first manner */
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
				(u32)1, cleanup_p2p_bridge, NULL, NULL);

718
	bridge = acpiphp_handle_to_bridge(handle);
719
	if (bridge)
720 721
		cleanup_bridge(bridge);
}
L
Linus Torvalds 已提交
722

723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
static struct pci_dev * get_apic_pci_info(acpi_handle handle)
{
	struct acpi_pci_id id;
	struct pci_bus *bus;
	struct pci_dev *dev;

	if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
		return NULL;

	bus = pci_find_bus(id.segment, id.bus);
	if (!bus)
		return NULL;

	dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
	if (!dev)
		return NULL;

	if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
	    (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
	{
		pci_dev_put(dev);
		return NULL;
	}

	return dev;
}

static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
{
	acpi_status status;
	int result = -1;
	unsigned long gsb;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *obj;
	void *table;

	status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
	if (ACPI_SUCCESS(status)) {
		*gsi_base = (u32)gsb;
		return 0;
	}

	status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
	if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
		return -1;

	obj = buffer.pointer;
	if (obj->type != ACPI_TYPE_BUFFER)
		goto out;

	table = obj->buffer.pointer;
774 775 776
	switch (((struct acpi_subtable_header *)table)->type) {
	case ACPI_MADT_TYPE_IO_SAPIC:
		*gsi_base = ((struct acpi_madt_io_sapic *)table)->global_irq_base;
777 778
		result = 0;
		break;
779 780
	case ACPI_MADT_TYPE_IO_APIC:
		*gsi_base = ((struct acpi_madt_io_apic *)table)->global_irq_base;
781 782 783 784 785 786
		result = 0;
		break;
	default:
		break;
	}
 out:
787
	kfree(buffer.pointer);
788 789 790 791 792 793 794 795 796 797 798 799
	return result;
}

static acpi_status
ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	acpi_status status;
	unsigned long sta;
	acpi_handle tmp;
	struct pci_dev *pdev;
	u32 gsi_base;
	u64 phys_addr;
800
	struct acpiphp_ioapic *ioapic;
801 802 803 804 805 806 807 808 809 810 811 812 813 814

	/* Evaluate _STA if present */
	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
		return AE_CTRL_DEPTH;

	/* Scan only PCI bus scope */
	status = acpi_get_handle(handle, "_HID", &tmp);
	if (ACPI_SUCCESS(status))
		return AE_CTRL_DEPTH;

	if (get_gsi_base(handle, &gsi_base))
		return AE_OK;

815 816 817 818
	ioapic = kmalloc(sizeof(*ioapic), GFP_KERNEL);
	if (!ioapic)
		return AE_NO_MEMORY;

819 820
	pdev = get_apic_pci_info(handle);
	if (!pdev)
821
		goto exit_kfree;
822

823 824
	if (pci_enable_device(pdev))
		goto exit_pci_dev_put;
825 826 827

	pci_set_master(pdev);

828 829
	if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)"))
		goto exit_pci_disable_device;
830 831

	phys_addr = pci_resource_start(pdev, 0);
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
	if (acpi_register_ioapic(handle, phys_addr, gsi_base))
		goto exit_pci_release_region;

	ioapic->gsi_base = gsi_base;
	ioapic->dev = pdev;
	spin_lock(&ioapic_list_lock);
	list_add_tail(&ioapic->list, &ioapic_list);
	spin_unlock(&ioapic_list_lock);

	return AE_OK;

 exit_pci_release_region:
	pci_release_region(pdev, 0);
 exit_pci_disable_device:
	pci_disable_device(pdev);
 exit_pci_dev_put:
	pci_dev_put(pdev);
 exit_kfree:
	kfree(ioapic);

	return AE_OK;
}

static acpi_status
ioapic_remove(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	acpi_status status;
	unsigned long sta;
	acpi_handle tmp;
	u32 gsi_base;
	struct acpiphp_ioapic *pos, *n, *ioapic = NULL;

	/* Evaluate _STA if present */
	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
	if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
		return AE_CTRL_DEPTH;

	/* Scan only PCI bus scope */
	status = acpi_get_handle(handle, "_HID", &tmp);
	if (ACPI_SUCCESS(status))
		return AE_CTRL_DEPTH;

	if (get_gsi_base(handle, &gsi_base))
875
		return AE_OK;
876 877 878 879 880 881 882 883 884 885

	acpi_unregister_ioapic(handle, gsi_base);

	spin_lock(&ioapic_list_lock);
	list_for_each_entry_safe(pos, n, &ioapic_list, list) {
		if (pos->gsi_base != gsi_base)
			continue;
		ioapic = pos;
		list_del(&ioapic->list);
		break;
886
	}
887 888 889 890 891 892 893 894 895
	spin_unlock(&ioapic_list_lock);

	if (!ioapic)
		return AE_OK;

	pci_release_region(ioapic->dev, 0);
	pci_disable_device(ioapic->dev);
	pci_dev_put(ioapic->dev);
	kfree(ioapic);
896 897 898 899 900 901

	return AE_OK;
}

static int acpiphp_configure_ioapics(acpi_handle handle)
{
902
	ioapic_add(handle, 0, NULL, NULL);
903 904 905 906 907
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
			    ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
	return 0;
}

908 909 910 911 912 913 914 915
static int acpiphp_unconfigure_ioapics(acpi_handle handle)
{
	ioapic_remove(handle, 0, NULL, NULL);
	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
			    ACPI_UINT32_MAX, ioapic_remove, NULL, NULL);
	return 0;
}

L
Linus Torvalds 已提交
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
static int power_on_slot(struct acpiphp_slot *slot)
{
	acpi_status status;
	struct acpiphp_func *func;
	struct list_head *l;
	int retval = 0;

	/* if already enabled, just skip */
	if (slot->flags & SLOT_POWEREDON)
		goto err_exit;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

		if (func->flags & FUNC_HAS_PS0) {
			dbg("%s: executing _PS0\n", __FUNCTION__);
			status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL);
			if (ACPI_FAILURE(status)) {
				warn("%s: _PS0 failed\n", __FUNCTION__);
				retval = -1;
				goto err_exit;
			} else
				break;
		}
	}

	/* TBD: evaluate _STA to check if the slot is enabled */

	slot->flags |= SLOT_POWEREDON;

 err_exit:
	return retval;
}


static int power_off_slot(struct acpiphp_slot *slot)
{
	acpi_status status;
	struct acpiphp_func *func;
	struct list_head *l;

	int retval = 0;

	/* if already disabled, just skip */
	if ((slot->flags & SLOT_POWEREDON) == 0)
		goto err_exit;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

966
		if (func->flags & FUNC_HAS_PS3) {
L
Linus Torvalds 已提交
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985
			status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL);
			if (ACPI_FAILURE(status)) {
				warn("%s: _PS3 failed\n", __FUNCTION__);
				retval = -1;
				goto err_exit;
			} else
				break;
		}
	}

	/* TBD: evaluate _STA to check if the slot is disabled */

	slot->flags &= (~SLOT_POWEREDON);

 err_exit:
	return retval;
}


986 987

/**
R
Randy Dunlap 已提交
988
 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
 * @bus: bus to start search with
 */
static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
{
	struct list_head *tmp;
	unsigned char max, n;

	/*
	 * pci_bus_max_busnr will return the highest
	 * reserved busnr for all these children.
	 * that is equivalent to the bus->subordinate
	 * value.  We don't want to use the parent's
	 * bus->subordinate value because it could have
	 * padding in it.
	 */
	max = bus->secondary;

	list_for_each(tmp, &bus->children) {
		n = pci_bus_max_busnr(pci_bus_b(tmp));
		if (n > max)
			max = n;
	}
	return max;
}


/**
 * acpiphp_bus_add - add a new bus to acpi subsystem
 * @func: acpiphp_func of the bridge
 */
static int acpiphp_bus_add(struct acpiphp_func *func)
{
	acpi_handle phandle;
	struct acpi_device *device, *pdevice;
	int ret_val;

	acpi_get_parent(func->handle, &phandle);
	if (acpi_bus_get_device(phandle, &pdevice)) {
		dbg("no parent device, assuming NULL\n");
		pdevice = NULL;
	}
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	if (!acpi_bus_get_device(func->handle, &device)) {
		dbg("bus exists... trim\n");
		/* this shouldn't be in here, so remove
		 * the bus then re-add it...
		 */
		ret_val = acpi_bus_trim(device, 1);
		dbg("acpi_bus_trim return %x\n", ret_val);
	}

	ret_val = acpi_bus_add(&device, pdevice, func->handle,
		ACPI_BUS_TYPE_DEVICE);
	if (ret_val) {
		dbg("error adding bus, %x\n",
			-ret_val);
		goto acpiphp_bus_add_out;
1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
	}
	/*
	 * try to start anyway.  We could have failed to add
	 * simply because this bus had previously been added
	 * on another add.  Don't bother with the return value
	 * we just keep going.
	 */
	ret_val = acpi_bus_start(device);

acpiphp_bus_add_out:
	return ret_val;
}


1059 1060 1061 1062
/**
 * acpiphp_bus_trim - trim a bus from acpi subsystem
 * @handle: handle to acpi namespace
 */
1063
static int acpiphp_bus_trim(acpi_handle handle)
1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
{
	struct acpi_device *device;
	int retval;

	retval = acpi_bus_get_device(handle, &device);
	if (retval) {
		dbg("acpi_device not found\n");
		return retval;
	}

	retval = acpi_bus_trim(device, 1);
	if (retval)
		err("cannot remove from acpi list\n");

	return retval;
}
1080

L
Linus Torvalds 已提交
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
/**
 * enable_device - enable, configure a slot
 * @slot: slot to be enabled
 *
 * This function should be called per *physical slot*,
 * not per each slot object in ACPI namespace.
 */
static int enable_device(struct acpiphp_slot *slot)
{
	struct pci_dev *dev;
1091
	struct pci_bus *bus = slot->bridge->pci_bus;
L
Linus Torvalds 已提交
1092 1093 1094
	struct list_head *l;
	struct acpiphp_func *func;
	int retval = 0;
1095
	int num, max, pass;
1096
	acpi_status status;
L
Linus Torvalds 已提交
1097 1098 1099 1100 1101

	if (slot->flags & SLOT_ENABLED)
		goto err_exit;

	/* sanity check: dev should be NULL when hot-plugged in */
1102
	dev = pci_get_slot(bus, PCI_DEVFN(slot->device, 0));
L
Linus Torvalds 已提交
1103 1104 1105
	if (dev) {
		/* This case shouldn't happen */
		err("pci_dev structure already exists.\n");
1106
		pci_dev_put(dev);
L
Linus Torvalds 已提交
1107 1108 1109 1110
		retval = -1;
		goto err_exit;
	}

1111 1112
	num = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0));
	if (num == 0) {
L
Linus Torvalds 已提交
1113 1114 1115 1116 1117
		err("No new device found\n");
		retval = -1;
		goto err_exit;
	}

1118
	max = acpiphp_max_busnr(bus);
1119 1120 1121 1122 1123
	for (pass = 0; pass < 2; pass++) {
		list_for_each_entry(dev, &bus->devices, bus_list) {
			if (PCI_SLOT(dev->devfn) != slot->device)
				continue;
			if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1124
			    dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
1125
				max = pci_scan_bridge(bus, dev, max, pass);
1126
				if (pass && dev->subordinate)
1127 1128
					pci_bus_size_bridges(dev->subordinate);
			}
1129
		}
L
Linus Torvalds 已提交
1130 1131
	}

1132 1133 1134 1135 1136
	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
		acpiphp_bus_add(func);
	}

1137
	pci_bus_assign_resources(bus);
1138
	acpiphp_sanitize_bus(bus);
1139
	acpiphp_set_hpp_values(slot->bridge->handle, bus);
1140 1141
	list_for_each_entry(func, &slot->funcs, sibling)
		acpiphp_configure_ioapics(func->handle);
1142
	pci_enable_bridges(bus);
1143 1144
	pci_bus_add_devices(bus);

L
Linus Torvalds 已提交
1145 1146 1147
	/* associate pci_dev to our representation */
	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
1148
		func->pci_dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
L
Linus Torvalds 已提交
1149
							func->function));
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160
		if (!func->pci_dev)
			continue;

		if (func->pci_dev->hdr_type != PCI_HEADER_TYPE_BRIDGE &&
		    func->pci_dev->hdr_type != PCI_HEADER_TYPE_CARDBUS)
			continue;

		status = find_p2p_bridge(func->handle, (u32)1, bus, NULL);
		if (ACPI_FAILURE(status))
			warn("find_p2p_bridge failed (error code = 0x%x)\n",
				status);
L
Linus Torvalds 已提交
1161 1162 1163 1164 1165 1166 1167 1168
	}

	slot->flags |= SLOT_ENABLED;

 err_exit:
	return retval;
}

S
Satoru Takeuchi 已提交
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
static void disable_bridges(struct pci_bus *bus)
{
	struct pci_dev *dev;
	list_for_each_entry(dev, &bus->devices, bus_list) {
		if (dev->subordinate) {
			disable_bridges(dev->subordinate);
			pci_disable_device(dev);
		}
	}
}
L
Linus Torvalds 已提交
1179 1180 1181

/**
 * disable_device - disable a slot
R
Randy Dunlap 已提交
1182
 * @slot: ACPI PHP slot
L
Linus Torvalds 已提交
1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
 */
static int disable_device(struct acpiphp_slot *slot)
{
	int retval = 0;
	struct acpiphp_func *func;
	struct list_head *l;

	/* is this slot already disabled? */
	if (!(slot->flags & SLOT_ENABLED))
		goto err_exit;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
1196

1197 1198 1199 1200 1201 1202 1203
		if (func->bridge) {
			/* cleanup p2p bridges under this P2P bridge */
			cleanup_p2p_bridge(func->bridge->handle,
						(u32)1, NULL, NULL);
			func->bridge = NULL;
		}

S
Satoru Takeuchi 已提交
1204
		if (func->pci_dev) {
1205
			pci_stop_bus_device(func->pci_dev);
S
Satoru Takeuchi 已提交
1206 1207 1208 1209 1210
			if (func->pci_dev->subordinate) {
				disable_bridges(func->pci_dev->subordinate);
				pci_disable_device(func->pci_dev);
			}
		}
1211 1212 1213 1214
	}

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);
1215

1216
		acpiphp_unconfigure_ioapics(func->handle);
1217 1218 1219 1220
		acpiphp_bus_trim(func->handle);
		/* try to remove anyway.
		 * acpiphp_bus_add might have been failed */

1221 1222
		if (!func->pci_dev)
			continue;
L
Linus Torvalds 已提交
1223

1224 1225 1226
		pci_remove_bus_device(func->pci_dev);
		pci_dev_put(func->pci_dev);
		func->pci_dev = NULL;
L
Linus Torvalds 已提交
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
	}

	slot->flags &= (~SLOT_ENABLED);

 err_exit:
	return retval;
}


/**
 * get_slot_status - get ACPI slot status
R
Randy Dunlap 已提交
1238
 * @slot: ACPI PHP slot
L
Linus Torvalds 已提交
1239
 *
R
Randy Dunlap 已提交
1240 1241
 * If a slot has _STA for each function and if any one of them
 * returned non-zero status, return it.
L
Linus Torvalds 已提交
1242
 *
R
Randy Dunlap 已提交
1243 1244
 * If a slot doesn't have _STA and if any one of its functions'
 * configuration space is configured, return 0x0f as a _STA.
L
Linus Torvalds 已提交
1245
 *
R
Randy Dunlap 已提交
1246
 * Otherwise return 0.
L
Linus Torvalds 已提交
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277
 */
static unsigned int get_slot_status(struct acpiphp_slot *slot)
{
	acpi_status status;
	unsigned long sta = 0;
	u32 dvid;
	struct list_head *l;
	struct acpiphp_func *func;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

		if (func->flags & FUNC_HAS_STA) {
			status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta);
			if (ACPI_SUCCESS(status) && sta)
				break;
		} else {
			pci_bus_read_config_dword(slot->bridge->pci_bus,
						  PCI_DEVFN(slot->device,
							    func->function),
						  PCI_VENDOR_ID, &dvid);
			if (dvid != 0xffffffff) {
				sta = ACPI_STA_ALL;
				break;
			}
		}
	}

	return (unsigned int)sta;
}

1278 1279
/**
 * acpiphp_eject_slot - physically eject the slot
R
Randy Dunlap 已提交
1280
 * @slot: ACPI PHP slot
1281
 */
1282
int acpiphp_eject_slot(struct acpiphp_slot *slot)
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
{
	acpi_status status;
	struct acpiphp_func *func;
	struct list_head *l;
	struct acpi_object_list arg_list;
	union acpi_object arg;

	list_for_each (l, &slot->funcs) {
		func = list_entry(l, struct acpiphp_func, sibling);

		/* We don't want to call _EJ0 on non-existing functions. */
		if ((func->flags & FUNC_HAS_EJ0)) {
			/* _EJ0 method take one argument */
			arg_list.count = 1;
			arg_list.pointer = &arg;
			arg.type = ACPI_TYPE_INTEGER;
			arg.integer.value = 1;

			status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL);
			if (ACPI_FAILURE(status)) {
				warn("%s: _EJ0 failed\n", __FUNCTION__);
				return -1;
			} else
				break;
		}
	}
	return 0;
}

L
Linus Torvalds 已提交
1312 1313
/**
 * acpiphp_check_bridge - re-enumerate devices
R
Randy Dunlap 已提交
1314
 * @bridge: where to begin re-enumeration
L
Linus Torvalds 已提交
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
 *
 * Iterate over all slots under this bridge and make sure that if a
 * card is present they are enabled, and if not they are disabled.
 */
static int acpiphp_check_bridge(struct acpiphp_bridge *bridge)
{
	struct acpiphp_slot *slot;
	int retval = 0;
	int enabled, disabled;

	enabled = disabled = 0;

	for (slot = bridge->slots; slot; slot = slot->next) {
		unsigned int status = get_slot_status(slot);
		if (slot->flags & SLOT_ENABLED) {
			if (status == ACPI_STA_ALL)
				continue;
			retval = acpiphp_disable_slot(slot);
			if (retval) {
				err("Error occurred in disabling\n");
				goto err_exit;
1336 1337
			} else {
				acpiphp_eject_slot(slot);
L
Linus Torvalds 已提交
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
			}
			disabled++;
		} else {
			if (status != ACPI_STA_ALL)
				continue;
			retval = acpiphp_enable_slot(slot);
			if (retval) {
				err("Error occurred in enabling\n");
				goto err_exit;
			}
			enabled++;
		}
	}

	dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled);

 err_exit:
	return retval;
}

1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
{
	u16 pci_cmd, pci_bctl;
	struct pci_dev *cdev;

	/* Program hpp values for this device */
	if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
			(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
			(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
		return;
1368

1369 1370 1371
	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
		return;

1372
	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
1373
			bridge->hpp.t0->cache_line_size);
1374
	pci_write_config_byte(dev, PCI_LATENCY_TIMER,
1375
			bridge->hpp.t0->latency_timer);
1376
	pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1377
	if (bridge->hpp.t0->enable_serr)
1378 1379 1380
		pci_cmd |= PCI_COMMAND_SERR;
	else
		pci_cmd &= ~PCI_COMMAND_SERR;
1381
	if (bridge->hpp.t0->enable_perr)
1382 1383 1384 1385 1386 1387 1388 1389
		pci_cmd |= PCI_COMMAND_PARITY;
	else
		pci_cmd &= ~PCI_COMMAND_PARITY;
	pci_write_config_word(dev, PCI_COMMAND, pci_cmd);

	/* Program bridge control value and child devices */
	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
		pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1390
				bridge->hpp.t0->latency_timer);
1391
		pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1392
		if (bridge->hpp.t0->enable_serr)
1393 1394 1395
			pci_bctl |= PCI_BRIDGE_CTL_SERR;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
1396
		if (bridge->hpp.t0->enable_perr)
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
			pci_bctl |= PCI_BRIDGE_CTL_PARITY;
		else
			pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
		pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
		if (dev->subordinate) {
			list_for_each_entry(cdev, &dev->subordinate->devices,
					bus_list)
				program_hpp(cdev, bridge);
		}
	}
}

static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus)
{
	struct acpiphp_bridge bridge;
	struct pci_dev *dev;

	memset(&bridge, 0, sizeof(bridge));
	bridge.handle = handle;
1416
	bridge.pci_bus = bus;
1417
	bridge.pci_dev = bus->self;
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	decode_hpp(&bridge);
	list_for_each_entry(dev, &bus->devices, bus_list)
		program_hpp(dev, &bridge);

}

/*
 * Remove devices for which we could not assign resources, call
 * arch specific code to fix-up the bus
 */
static void acpiphp_sanitize_bus(struct pci_bus *bus)
{
	struct pci_dev *dev;
	int i;
	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
			struct resource *res = &dev->resource[i];
			if ((res->flags & type_mask) && !res->start &&
					res->end) {
				/* Could not assign a required resources
				 * for this device, remove it */
				pci_remove_bus_device(dev);
				break;
			}
		}
	}
}

/* Program resources in newly inserted bridge */
static int acpiphp_configure_bridge (acpi_handle handle)
{
	struct acpi_pci_id pci_id;
	struct pci_bus *bus;

	if (ACPI_FAILURE(acpi_get_pci_id(handle, &pci_id))) {
		err("cannot get PCI domain and bus number for bridge\n");
		return -EINVAL;
	}
	bus = pci_find_bus(pci_id.segment, pci_id.bus);
	if (!bus) {
		err("cannot find bus %d:%d\n",
				pci_id.segment, pci_id.bus);
		return -EINVAL;
	}

	pci_bus_size_bridges(bus);
	pci_bus_assign_resources(bus);
	acpiphp_sanitize_bus(bus);
	acpiphp_set_hpp_values(handle, bus);
	pci_enable_bridges(bus);
1470
	acpiphp_configure_ioapics(handle);
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501
	return 0;
}

static void handle_bridge_insertion(acpi_handle handle, u32 type)
{
	struct acpi_device *device, *pdevice;
	acpi_handle phandle;

	if ((type != ACPI_NOTIFY_BUS_CHECK) &&
			(type != ACPI_NOTIFY_DEVICE_CHECK)) {
		err("unexpected notification type %d\n", type);
		return;
	}

	acpi_get_parent(handle, &phandle);
	if (acpi_bus_get_device(phandle, &pdevice)) {
		dbg("no parent device, assuming NULL\n");
		pdevice = NULL;
	}
	if (acpi_bus_add(&device, pdevice, handle, ACPI_BUS_TYPE_DEVICE)) {
		err("cannot add bridge to acpi list\n");
		return;
	}
	if (!acpiphp_configure_bridge(handle) &&
		!acpi_bus_start(device))
		add_bridge(handle);
	else
		err("cannot configure and start bridge\n");

}

L
Linus Torvalds 已提交
1502 1503 1504 1505
/*
 * ACPI event handlers
 */

1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
static acpi_status
count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int *count = (int *)context;
	struct acpiphp_bridge *bridge;

	bridge = acpiphp_handle_to_bridge(handle);
	if (bridge)
		(*count)++;
	return AE_OK ;
}

static acpi_status
check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	struct acpiphp_bridge *bridge;
	char objname[64];
	struct acpi_buffer buffer = { .length = sizeof(objname),
				      .pointer = objname };

	bridge = acpiphp_handle_to_bridge(handle);
	if (bridge) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
		dbg("%s: re-enumerating slots under %s\n",
			__FUNCTION__, objname);
		acpiphp_check_bridge(bridge);
	}
	return AE_OK ;
}

L
Linus Torvalds 已提交
1536 1537 1538 1539 1540 1541
/**
 * handle_hotplug_event_bridge - handle ACPI event on bridges
 * @handle: Notify()'ed acpi_handle
 * @type: Notify code
 * @context: pointer to acpiphp_bridge structure
 *
R
Randy Dunlap 已提交
1542
 * Handles ACPI event notification on {host,p2p} bridges.
L
Linus Torvalds 已提交
1543 1544 1545 1546 1547 1548 1549
 */
static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context)
{
	struct acpiphp_bridge *bridge;
	char objname[64];
	struct acpi_buffer buffer = { .length = sizeof(objname),
				      .pointer = objname };
1550
	struct acpi_device *device;
1551
	int num_sub_bridges = 0;
L
Linus Torvalds 已提交
1552

1553 1554 1555 1556 1557 1558 1559
	if (acpi_bus_get_device(handle, &device)) {
		/* This bridge must have just been physically inserted */
		handle_bridge_insertion(handle, type);
		return;
	}

	bridge = acpiphp_handle_to_bridge(handle);
1560 1561 1562 1563 1564 1565
	if (type == ACPI_NOTIFY_BUS_CHECK) {
		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
			count_sub_bridges, &num_sub_bridges, NULL);
	}

	if (!bridge && !num_sub_bridges) {
1566 1567 1568
		err("cannot get bridge info\n");
		return;
	}
L
Linus Torvalds 已提交
1569 1570 1571 1572 1573 1574 1575

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		/* bus re-enumerate */
		dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
1576 1577 1578 1579 1580 1581 1582 1583
		if (bridge) {
			dbg("%s: re-enumerating slots under %s\n",
				__FUNCTION__, objname);
			acpiphp_check_bridge(bridge);
		}
		if (num_sub_bridges)
			acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
				ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
L
Linus Torvalds 已提交
1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		/* device check */
		dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
		acpiphp_check_bridge(bridge);
		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
		/* wake event */
		dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		/* request device eject */
		dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1600 1601 1602 1603 1604 1605 1606
		if ((bridge->type != BRIDGE_TYPE_HOST) &&
		    (bridge->flags & BRIDGE_HAS_EJ0)) {
			struct acpiphp_slot *slot;
			slot = bridge->func->slot;
			if (!acpiphp_disable_slot(slot))
				acpiphp_eject_slot(slot);
		}
L
Linus Torvalds 已提交
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
		break;

	case ACPI_NOTIFY_FREQUENCY_MISMATCH:
		printk(KERN_ERR "Device %s cannot be configured due"
				" to a frequency mismatch\n", objname);
		break;

	case ACPI_NOTIFY_BUS_MODE_MISMATCH:
		printk(KERN_ERR "Device %s cannot be configured due"
				" to a bus mode mismatch\n", objname);
		break;

	case ACPI_NOTIFY_POWER_FAULT:
		printk(KERN_ERR "Device %s has suffered a power fault\n",
				objname);
		break;

	default:
		warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
		break;
	}
}

/**
 * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots)
 * @handle: Notify()'ed acpi_handle
 * @type: Notify code
 * @context: pointer to acpiphp_func structure
 *
R
Randy Dunlap 已提交
1636
 * Handles ACPI event notification on slots.
L
Linus Torvalds 已提交
1637
 */
1638
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context)
L
Linus Torvalds 已提交
1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669
{
	struct acpiphp_func *func;
	char objname[64];
	struct acpi_buffer buffer = { .length = sizeof(objname),
				      .pointer = objname };

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);

	func = (struct acpiphp_func *)context;

	switch (type) {
	case ACPI_NOTIFY_BUS_CHECK:
		/* bus re-enumerate */
		dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
		acpiphp_enable_slot(func->slot);
		break;

	case ACPI_NOTIFY_DEVICE_CHECK:
		/* device check : re-enumerate from parent bus */
		dbg("%s: Device check notify on %s\n", __FUNCTION__, objname);
		acpiphp_check_bridge(func->slot->bridge);
		break;

	case ACPI_NOTIFY_DEVICE_WAKE:
		/* wake event */
		dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname);
		break;

	case ACPI_NOTIFY_EJECT_REQUEST:
		/* request device eject */
		dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname);
1670 1671
		if (!(acpiphp_disable_slot(func->slot)))
			acpiphp_eject_slot(func->slot);
L
Linus Torvalds 已提交
1672 1673 1674 1675 1676 1677 1678 1679
		break;

	default:
		warn("notify_handler: unknown event type 0x%x for %s\n", type, objname);
		break;
	}
}

1680 1681 1682 1683 1684 1685

static acpi_status
find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int *count = (int *)context;

1686
	if (acpi_root_bridge(handle)) {
1687 1688 1689 1690 1691 1692
		acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
				handle_hotplug_event_bridge, NULL);
			(*count)++;
	}
	return AE_OK ;
}
L
Linus Torvalds 已提交
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703

static struct acpi_pci_driver acpi_pci_hp_driver = {
	.add =		add_bridge,
	.remove =	remove_bridge,
};

/**
 * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures
 */
int __init acpiphp_glue_init(void)
{
1704
	int num = 0;
L
Linus Torvalds 已提交
1705

1706 1707
	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
			ACPI_UINT32_MAX, find_root_bridges, &num, NULL);
L
Linus Torvalds 已提交
1708 1709 1710

	if (num <= 0)
		return -1;
1711 1712
	else
		acpi_pci_register_driver(&acpi_pci_hp_driver);
L
Linus Torvalds 已提交
1713 1714 1715 1716 1717 1718 1719 1720

	return 0;
}


/**
 * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures
 *
R
Randy Dunlap 已提交
1721
 * This function frees all data allocated in acpiphp_glue_init().
L
Linus Torvalds 已提交
1722
 */
1723
void  acpiphp_glue_exit(void)
L
Linus Torvalds 已提交
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
{
	acpi_pci_unregister_driver(&acpi_pci_hp_driver);
}


/**
 * acpiphp_get_num_slots - count number of slots in a system
 */
int __init acpiphp_get_num_slots(void)
{
	struct acpiphp_bridge *bridge;
1735
	int num_slots = 0;
L
Linus Torvalds 已提交
1736

1737
	list_for_each_entry (bridge, &bridge_list, list) {
1738 1739 1740 1741
		dbg("Bus %04x:%02x has %d slot%s\n",
				pci_domain_nr(bridge->pci_bus),
				bridge->pci_bus->number, bridge->nr_slots,
				bridge->nr_slots == 1 ? "" : "s");
L
Linus Torvalds 已提交
1742 1743 1744
		num_slots += bridge->nr_slots;
	}

1745
	dbg("Total %d slots\n", num_slots);
L
Linus Torvalds 已提交
1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
	return num_slots;
}


#if 0
/**
 * acpiphp_for_each_slot - call function for each slot
 * @fn: callback function
 * @data: context to be passed to callback function
 */
static int acpiphp_for_each_slot(acpiphp_callback fn, void *data)
{
	struct list_head *node;
	struct acpiphp_bridge *bridge;
	struct acpiphp_slot *slot;
	int retval = 0;

	list_for_each (node, &bridge_list) {
		bridge = (struct acpiphp_bridge *)node;
		for (slot = bridge->slots; slot; slot = slot->next) {
			retval = fn(slot, data);
			if (!retval)
				goto err_exit;
		}
	}

 err_exit:
	return retval;
}
#endif


/**
 * acpiphp_enable_slot - power on slot
R
Randy Dunlap 已提交
1780
 * @slot: ACPI PHP slot
L
Linus Torvalds 已提交
1781 1782 1783 1784 1785
 */
int acpiphp_enable_slot(struct acpiphp_slot *slot)
{
	int retval;

1786
	mutex_lock(&slot->crit_sect);
L
Linus Torvalds 已提交
1787 1788 1789 1790 1791 1792

	/* wake up all functions */
	retval = power_on_slot(slot);
	if (retval)
		goto err_exit;

1793
	if (get_slot_status(slot) == ACPI_STA_ALL) {
L
Linus Torvalds 已提交
1794 1795
		/* configure all functions */
		retval = enable_device(slot);
1796 1797 1798 1799 1800 1801
		if (retval)
			power_off_slot(slot);
	} else {
		dbg("%s: Slot status is not ACPI_STA_ALL\n", __FUNCTION__);
		power_off_slot(slot);
	}
L
Linus Torvalds 已提交
1802 1803

 err_exit:
1804
	mutex_unlock(&slot->crit_sect);
L
Linus Torvalds 已提交
1805 1806 1807 1808 1809
	return retval;
}

/**
 * acpiphp_disable_slot - power off slot
R
Randy Dunlap 已提交
1810
 * @slot: ACPI PHP slot
L
Linus Torvalds 已提交
1811 1812 1813 1814 1815
 */
int acpiphp_disable_slot(struct acpiphp_slot *slot)
{
	int retval = 0;

1816
	mutex_lock(&slot->crit_sect);
L
Linus Torvalds 已提交
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828

	/* unconfigure all functions */
	retval = disable_device(slot);
	if (retval)
		goto err_exit;

	/* power off all functions */
	retval = power_off_slot(slot);
	if (retval)
		goto err_exit;

 err_exit:
1829
	mutex_unlock(&slot->crit_sect);
L
Linus Torvalds 已提交
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839
	return retval;
}


/*
 * slot enabled:  1
 * slot disabled: 0
 */
u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
{
1840
	return (slot->flags & SLOT_POWEREDON);
L
Linus Torvalds 已提交
1841 1842 1843 1844
}


/*
M
MUNEDA Takahiro 已提交
1845 1846
 * latch   open:  1
 * latch closed:  0
L
Linus Torvalds 已提交
1847 1848 1849 1850 1851 1852 1853
 */
u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
{
	unsigned int sta;

	sta = get_slot_status(slot);

M
MUNEDA Takahiro 已提交
1854
	return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
L
Linus Torvalds 已提交
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
}


/*
 * adapter presence : 1
 *          absence : 0
 */
u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
{
	unsigned int sta;

	sta = get_slot_status(slot);

	return (sta == 0) ? 0 : 1;
}


/*
 * pci address (seg/bus/dev)
 */
u32 acpiphp_get_address(struct acpiphp_slot *slot)
{
	u32 address;
1878
	struct pci_bus *pci_bus = slot->bridge->pci_bus;
L
Linus Torvalds 已提交
1879

1880 1881
	address = (pci_domain_nr(pci_bus) << 16) |
		  (pci_bus->number << 8) |
L
Linus Torvalds 已提交
1882 1883 1884 1885
		  slot->device;

	return address;
}