3  *  pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
10  *	1. Support more than one IRQ resource entry per link device (index).
33 #define ACPI_PCI_LINK_DEVICE_NAME	"PCI Interrupt Link"
52  * If a link is initialized, we never change its active and initialized
53  * later even the link is disable. Instead, we just repick the active irq
78                             PCI Link Device Management
82  * set context (link) possible list from resource list
87 	struct acpi_pci_link *link = context;  in acpi_pci_link_check_possible()  local
111 				link->irq.possible[i] = p->interrupts[i];  in acpi_pci_link_check_possible()
112 				link->irq.possible_count++;  in acpi_pci_link_check_possible()
114 			link->irq.triggering = p->triggering;  in acpi_pci_link_check_possible()
115 			link->irq.polarity = p->polarity;  in acpi_pci_link_check_possible()
116 			link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;  in acpi_pci_link_check_possible()
137 				link->irq.possible[i] = p->interrupts[i];  in acpi_pci_link_check_possible()
138 				link->irq.possible_count++;  in acpi_pci_link_check_possible()
140 			link->irq.triggering = p->triggering;  in acpi_pci_link_check_possible()
141 			link->irq.polarity = p->polarity;  in acpi_pci_link_check_possible()
142 			link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;  in acpi_pci_link_check_possible()
154 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)  in acpi_pci_link_get_possible()  argument
158 	status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,  in acpi_pci_link_get_possible()
159 				     acpi_pci_link_check_possible, link);  in acpi_pci_link_get_possible()
161 		acpi_handle_debug(link->device->handle, "_PRS not present or invalid");  in acpi_pci_link_get_possible()
167 			  link->irq.possible_count));  in acpi_pci_link_get_possible()
223  * Run _CRS and set link->irq.active
229 static int acpi_pci_link_get_current(struct acpi_pci_link *link)  in acpi_pci_link_get_current()  argument
235 	link->irq.active = 0;  in acpi_pci_link_get_current()
239 		/* Query _STA, set link->device->status */  in acpi_pci_link_get_current()
240 		result = acpi_bus_get_status(link->device);  in acpi_pci_link_get_current()
246 		if (!link->device->status.enabled) {  in acpi_pci_link_get_current()
247 			ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));  in acpi_pci_link_get_current()
256 	status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,  in acpi_pci_link_get_current()
269 	link->irq.active = irq;  in acpi_pci_link_get_current()
271 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));  in acpi_pci_link_get_current()
277 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)  in acpi_pci_link_set()  argument
297 	switch (link->irq.resource_type) {  in acpi_pci_link_set()
301 		resource->res.data.irq.triggering = link->irq.triggering;  in acpi_pci_link_set()
303 		    link->irq.polarity;  in acpi_pci_link_set()
304 		if (link->irq.triggering == ACPI_EDGE_SENSITIVE)  in acpi_pci_link_set()
319 		    link->irq.triggering;  in acpi_pci_link_set()
321 		    link->irq.polarity;  in acpi_pci_link_set()
322 		if (link->irq.triggering == ACPI_EDGE_SENSITIVE)  in acpi_pci_link_set()
332 		printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);  in acpi_pci_link_set()
341 	status = acpi_set_current_resources(link->device->handle, &buffer);  in acpi_pci_link_set()
351 	result = acpi_bus_get_status(link->device);  in acpi_pci_link_set()
356 	if (!link->device->status.enabled) {  in acpi_pci_link_set()
359 			      acpi_device_name(link->device),  in acpi_pci_link_set()
360 			      acpi_device_bid(link->device));  in acpi_pci_link_set()
363 	/* Query _CRS, set link->irq.active */  in acpi_pci_link_set()
364 	result = acpi_pci_link_get_current(link);  in acpi_pci_link_set()
371 	 * set link->irq.active  in acpi_pci_link_set()
373 	if (link->irq.active != irq) {  in acpi_pci_link_set()
380 			      acpi_device_name(link->device),  in acpi_pci_link_set()
381 			      acpi_device_bid(link->device), link->irq.active, irq);  in acpi_pci_link_set()
382 		link->irq.active = irq;  in acpi_pci_link_set()
385 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));  in acpi_pci_link_set()
393                             PCI Link IRQ Management
398  * Link Devices to move the PIRQs around to minimize sharing.
403  * if the BIOS doesn't set a Link Device active, ACPI needs to program it
418  * Since this heuristic can't tell the difference between a link
419  * that no device will attach to, vs. a link which may be shared
457 	struct acpi_pci_link *link;  in acpi_irq_pci_sharing_penalty()  local
461 	list_for_each_entry(link, &acpi_link_list, list) {  in acpi_irq_pci_sharing_penalty()
463 		 * If a link is active, penalize its IRQ heavily  in acpi_irq_pci_sharing_penalty()
466 		if (link->irq.active && link->irq.active == irq)  in acpi_irq_pci_sharing_penalty()
472 		for (i = 0; i < link->irq.possible_count; i++)  in acpi_irq_pci_sharing_penalty()
473 			if (link->irq.possible[i] == irq)  in acpi_irq_pci_sharing_penalty()
475 					link->irq.possible_count;  in acpi_irq_pci_sharing_penalty()
496 	struct acpi_pci_link *link;  in acpi_irq_penalty_init()  local
502 	list_for_each_entry(link, &acpi_link_list, list) {  in acpi_irq_penalty_init()
508 		if (link->irq.possible_count) {  in acpi_irq_penalty_init()
511 			    link->irq.possible_count;  in acpi_irq_penalty_init()
513 			for (i = 0; i < link->irq.possible_count; i++) {  in acpi_irq_penalty_init()
514 				if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS)  in acpi_irq_penalty_init()
515 					acpi_isa_irq_penalty[link->irq.  in acpi_irq_penalty_init()
520 		} else if (link->irq.active &&  in acpi_irq_penalty_init()
521 				(link->irq.active < ACPI_MAX_ISA_IRQS)) {  in acpi_irq_penalty_init()
522 			acpi_isa_irq_penalty[link->irq.active] +=  in acpi_irq_penalty_init()
532 static int acpi_pci_link_allocate(struct acpi_pci_link *link)  in acpi_pci_link_allocate()  argument
537 	if (link->irq.initialized) {  in acpi_pci_link_allocate()
538 		if (link->refcnt == 0)  in acpi_pci_link_allocate()
539 			/* This means the link is disabled but initialized */  in acpi_pci_link_allocate()
540 			acpi_pci_link_set(link, link->irq.active);  in acpi_pci_link_allocate()
547 	for (i = 0; i < link->irq.possible_count; ++i) {  in acpi_pci_link_allocate()
548 		if (link->irq.active == link->irq.possible[i])  in acpi_pci_link_allocate()
554 	if (i == link->irq.possible_count) {  in acpi_pci_link_allocate()
557 				      " in _PRS\n", link->irq.active);  in acpi_pci_link_allocate()
558 		link->irq.active = 0;  in acpi_pci_link_allocate()
564 	if (link->irq.active)  in acpi_pci_link_allocate()
565 		irq = link->irq.active;  in acpi_pci_link_allocate()
567 		irq = link->irq.possible[link->irq.possible_count - 1];  in acpi_pci_link_allocate()
569 	if (acpi_irq_balance || !link->irq.active) {  in acpi_pci_link_allocate()
574 		for (i = (link->irq.possible_count - 1); i >= 0; i--) {  in acpi_pci_link_allocate()
576 			    acpi_irq_get_penalty(link->irq.possible[i]))  in acpi_pci_link_allocate()
577 				irq = link->irq.possible[i];  in acpi_pci_link_allocate()
583 			    acpi_device_name(link->device),  in acpi_pci_link_allocate()
584 			    acpi_device_bid(link->device));  in acpi_pci_link_allocate()
588 	/* Attempt to enable the link device at this IRQ. */  in acpi_pci_link_allocate()
589 	if (acpi_pci_link_set(link, irq)) {  in acpi_pci_link_allocate()
592 			    acpi_device_name(link->device),  in acpi_pci_link_allocate()
593 			    acpi_device_bid(link->device));  in acpi_pci_link_allocate()
596 		if (link->irq.active < ACPI_MAX_ISA_IRQS)  in acpi_pci_link_allocate()
597 			acpi_isa_irq_penalty[link->irq.active] +=  in acpi_pci_link_allocate()
601 		       acpi_device_name(link->device),  in acpi_pci_link_allocate()
602 		       acpi_device_bid(link->device), link->irq.active);  in acpi_pci_link_allocate()
605 	link->irq.initialized = 1;  in acpi_pci_link_allocate()
619 	struct acpi_pci_link *link;  in acpi_pci_link_allocate_irq()  local
623 		printk(KERN_ERR PREFIX "Invalid link device\n");  in acpi_pci_link_allocate_irq()
627 	link = acpi_driver_data(device);  in acpi_pci_link_allocate_irq()
628 	if (!link) {  in acpi_pci_link_allocate_irq()
629 		printk(KERN_ERR PREFIX "Invalid link context\n");  in acpi_pci_link_allocate_irq()
633 	/* TBD: Support multiple index (IRQ) entries per Link Device */  in acpi_pci_link_allocate_irq()
640 	if (acpi_pci_link_allocate(link)) {  in acpi_pci_link_allocate_irq()
645 	if (!link->irq.active) {  in acpi_pci_link_allocate_irq()
647 		printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");  in acpi_pci_link_allocate_irq()
650 	link->refcnt++;  in acpi_pci_link_allocate_irq()
654 		*triggering = link->irq.triggering;  in acpi_pci_link_allocate_irq()
656 		*polarity = link->irq.polarity;  in acpi_pci_link_allocate_irq()
658 		*name = acpi_device_bid(link->device);  in acpi_pci_link_allocate_irq()
660 			  "Link %s is referenced\n",  in acpi_pci_link_allocate_irq()
661 			  acpi_device_bid(link->device)));  in acpi_pci_link_allocate_irq()
662 	return link->irq.active;  in acpi_pci_link_allocate_irq()
666  * We don't change link's irq information here.  After it is reenabled, we
672 	struct acpi_pci_link *link;  in acpi_pci_link_free_irq()  local
677 		printk(KERN_ERR PREFIX "Invalid link device\n");  in acpi_pci_link_free_irq()
681 	link = acpi_driver_data(device);  in acpi_pci_link_free_irq()
682 	if (!link) {  in acpi_pci_link_free_irq()
683 		printk(KERN_ERR PREFIX "Invalid link context\n");  in acpi_pci_link_free_irq()
688 	if (!link->irq.initialized) {  in acpi_pci_link_free_irq()
690 		printk(KERN_ERR PREFIX "Link isn't initialized\n");  in acpi_pci_link_free_irq()
695 	 * The Link reference count allows us to _DISable an unused link  in acpi_pci_link_free_irq()
698 	 * which blindly restores the link state.  in acpi_pci_link_free_irq()
703 	link->refcnt--;  in acpi_pci_link_free_irq()
706 			  "Link %s is dereferenced\n",  in acpi_pci_link_free_irq()
707 			  acpi_device_bid(link->device)));  in acpi_pci_link_free_irq()
709 	if (link->refcnt == 0)  in acpi_pci_link_free_irq()
710 		acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);  in acpi_pci_link_free_irq()
713 	return link->irq.active;  in acpi_pci_link_free_irq()
724 	struct acpi_pci_link *link;  in acpi_pci_link_add()  local
728 	link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);  in acpi_pci_link_add()
729 	if (!link)  in acpi_pci_link_add()
732 	link->device = device;  in acpi_pci_link_add()
735 	device->driver_data = link;  in acpi_pci_link_add()
738 	result = acpi_pci_link_get_possible(link);  in acpi_pci_link_add()
742 	/* query and set link->irq.active */  in acpi_pci_link_add()
743 	acpi_pci_link_get_current(link);  in acpi_pci_link_add()
747 	for (i = 0; i < link->irq.possible_count; i++) {  in acpi_pci_link_add()
748 		if (link->irq.active == link->irq.possible[i]) {  in acpi_pci_link_add()
749 			printk(KERN_CONT " *%d", link->irq.possible[i]);  in acpi_pci_link_add()
752 			printk(KERN_CONT " %d", link->irq.possible[i]);  in acpi_pci_link_add()
758 		printk(KERN_CONT " *%d", link->irq.active);  in acpi_pci_link_add()
760 	if (!link->device->status.enabled)  in acpi_pci_link_add()
765 	list_add_tail(&link->list, &acpi_link_list);  in acpi_pci_link_add()
773 		kfree(link);  in acpi_pci_link_add()
778 static int acpi_pci_link_resume(struct acpi_pci_link *link)  in acpi_pci_link_resume()  argument
780 	if (link->refcnt && link->irq.active && link->irq.initialized)  in acpi_pci_link_resume()
781 		return (acpi_pci_link_set(link, link->irq.active));  in acpi_pci_link_resume()
788 	struct acpi_pci_link *link;  in irqrouter_resume()  local
790 	list_for_each_entry(link, &acpi_link_list, list) {  in irqrouter_resume()
791 		acpi_pci_link_resume(link);  in irqrouter_resume()
797 	struct acpi_pci_link *link;  in acpi_pci_link_remove()  local
799 	link = acpi_driver_data(device);  in acpi_pci_link_remove()
802 	list_del(&link->list);  in acpi_pci_link_remove()
805 	kfree(link);  in acpi_pci_link_remove()