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
88 	acpi_handle handle = link->device->handle;  in acpi_pci_link_check_possible()
112 				link->irq.possible[i] = p->interrupts[i];  in acpi_pci_link_check_possible()
113 				link->irq.possible_count++;  in acpi_pci_link_check_possible()
115 			link->irq.triggering = p->triggering;  in acpi_pci_link_check_possible()
116 			link->irq.polarity = p->polarity;  in acpi_pci_link_check_possible()
117 			link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;  in acpi_pci_link_check_possible()
138 				link->irq.possible[i] = p->interrupts[i];  in acpi_pci_link_check_possible()
139 				link->irq.possible_count++;  in acpi_pci_link_check_possible()
141 			link->irq.triggering = p->triggering;  in acpi_pci_link_check_possible()
142 			link->irq.polarity = p->polarity;  in acpi_pci_link_check_possible()
143 			link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;  in acpi_pci_link_check_possible()
155 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)  in acpi_pci_link_get_possible()  argument
157 	acpi_handle handle = link->device->handle;  in acpi_pci_link_get_possible()
161 				     acpi_pci_link_check_possible, link);  in acpi_pci_link_get_possible()
168 			  link->irq.possible_count);  in acpi_pci_link_get_possible()
222  * Run _CRS and set link->irq.active
228 static int acpi_pci_link_get_current(struct acpi_pci_link *link)  in acpi_pci_link_get_current()  argument
230 	acpi_handle handle = link->device->handle;  in acpi_pci_link_get_current()
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_handle_debug(handle, "Link disabled\n");  in acpi_pci_link_get_current()
269 	link->irq.active = irq;  in acpi_pci_link_get_current()
271 	acpi_handle_debug(handle, "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
284 	acpi_handle handle = link->device->handle;  in acpi_pci_link_set()
298 	switch (link->irq.resource_type) {  in acpi_pci_link_set()
302 		resource->res.data.irq.triggering = link->irq.triggering;  in acpi_pci_link_set()
304 		    link->irq.polarity;  in acpi_pci_link_set()
305 		if (link->irq.triggering == ACPI_EDGE_SENSITIVE)  in acpi_pci_link_set()
320 		    link->irq.triggering;  in acpi_pci_link_set()
322 		    link->irq.polarity;  in acpi_pci_link_set()
323 		if (link->irq.triggering == ACPI_EDGE_SENSITIVE)  in acpi_pci_link_set()
334 				link->irq.resource_type);  in acpi_pci_link_set()
343 	status = acpi_set_current_resources(link->device->handle, &buffer);  in acpi_pci_link_set()
353 	result = acpi_bus_get_status(link->device);  in acpi_pci_link_set()
358 	if (!link->device->status.enabled)  in acpi_pci_link_set()
361 	/* Query _CRS, set link->irq.active */  in acpi_pci_link_set()
362 	result = acpi_pci_link_get_current(link);  in acpi_pci_link_set()
369 	 * set link->irq.active  in acpi_pci_link_set()
371 	if (link->irq.active != irq) {  in acpi_pci_link_set()
377 				 link->irq.active, irq);  in acpi_pci_link_set()
378 		link->irq.active = irq;  in acpi_pci_link_set()
381 	acpi_handle_debug(handle, "Set IRQ %d\n", link->irq.active);  in acpi_pci_link_set()
389                             PCI Link IRQ Management
394  * Link Devices to move the PIRQs around to minimize sharing.
399  * if the BIOS doesn't set a Link Device active, ACPI needs to program it
414  * Since this heuristic can't tell the difference between a link
415  * that no device will attach to, vs. a link which may be shared
453 	struct acpi_pci_link *link;  in acpi_irq_pci_sharing_penalty()  local
457 	list_for_each_entry(link, &acpi_link_list, list) {  in acpi_irq_pci_sharing_penalty()
459 		 * If a link is active, penalize its IRQ heavily  in acpi_irq_pci_sharing_penalty()
462 		if (link->irq.active && link->irq.active == irq)  in acpi_irq_pci_sharing_penalty()
468 		for (i = 0; i < link->irq.possible_count; i++)  in acpi_irq_pci_sharing_penalty()
469 			if (link->irq.possible[i] == irq)  in acpi_irq_pci_sharing_penalty()
471 					link->irq.possible_count;  in acpi_irq_pci_sharing_penalty()
492 	struct acpi_pci_link *link;  in acpi_irq_penalty_init()  local
498 	list_for_each_entry(link, &acpi_link_list, list) {  in acpi_irq_penalty_init()
504 		if (link->irq.possible_count) {  in acpi_irq_penalty_init()
507 			    link->irq.possible_count;  in acpi_irq_penalty_init()
509 			for (i = 0; i < link->irq.possible_count; i++) {  in acpi_irq_penalty_init()
510 				if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS)  in acpi_irq_penalty_init()
511 					acpi_isa_irq_penalty[link->irq.  in acpi_irq_penalty_init()
516 		} else if (link->irq.active &&  in acpi_irq_penalty_init()
517 				(link->irq.active < ACPI_MAX_ISA_IRQS)) {  in acpi_irq_penalty_init()
518 			acpi_isa_irq_penalty[link->irq.active] +=  in acpi_irq_penalty_init()
528 static int acpi_pci_link_allocate(struct acpi_pci_link *link)  in acpi_pci_link_allocate()  argument
530 	acpi_handle handle = link->device->handle;  in acpi_pci_link_allocate()
534 	if (link->irq.initialized) {  in acpi_pci_link_allocate()
535 		if (link->refcnt == 0)  in acpi_pci_link_allocate()
536 			/* This means the link is disabled but initialized */  in acpi_pci_link_allocate()
537 			acpi_pci_link_set(link, link->irq.active);  in acpi_pci_link_allocate()
544 	for (i = 0; i < link->irq.possible_count; ++i) {  in acpi_pci_link_allocate()
545 		if (link->irq.active == link->irq.possible[i])  in acpi_pci_link_allocate()
551 	if (i == link->irq.possible_count) {  in acpi_pci_link_allocate()
554 					 link->irq.active);  in acpi_pci_link_allocate()
555 		link->irq.active = 0;  in acpi_pci_link_allocate()
561 	if (link->irq.active)  in acpi_pci_link_allocate()
562 		irq = link->irq.active;  in acpi_pci_link_allocate()
564 		irq = link->irq.possible[link->irq.possible_count - 1];  in acpi_pci_link_allocate()
566 	if (acpi_irq_balance || !link->irq.active) {  in acpi_pci_link_allocate()
571 		for (i = (link->irq.possible_count - 1); i >= 0; i--) {  in acpi_pci_link_allocate()
573 			    acpi_irq_get_penalty(link->irq.possible[i]))  in acpi_pci_link_allocate()
574 				irq = link->irq.possible[i];  in acpi_pci_link_allocate()
583 	/* Attempt to enable the link device at this IRQ. */  in acpi_pci_link_allocate()
584 	if (acpi_pci_link_set(link, irq)) {  in acpi_pci_link_allocate()
589 		if (link->irq.active < ACPI_MAX_ISA_IRQS)  in acpi_pci_link_allocate()
590 			acpi_isa_irq_penalty[link->irq.active] +=  in acpi_pci_link_allocate()
594 				 link->irq.active);  in acpi_pci_link_allocate()
597 	link->irq.initialized = 1;  in acpi_pci_link_allocate()
610 	struct acpi_pci_link *link;  in acpi_pci_link_allocate_irq()  local
613 		acpi_handle_err(handle, "Invalid link device\n");  in acpi_pci_link_allocate_irq()
617 	link = acpi_driver_data(device);  in acpi_pci_link_allocate_irq()
618 	if (!link) {  in acpi_pci_link_allocate_irq()
619 		acpi_handle_err(handle, "Invalid link context\n");  in acpi_pci_link_allocate_irq()
623 	/* TBD: Support multiple index (IRQ) entries per Link Device */  in acpi_pci_link_allocate_irq()
630 	if (acpi_pci_link_allocate(link)) {  in acpi_pci_link_allocate_irq()
635 	if (!link->irq.active) {  in acpi_pci_link_allocate_irq()
637 		acpi_handle_err(handle, "Link active IRQ is 0!\n");  in acpi_pci_link_allocate_irq()
640 	link->refcnt++;  in acpi_pci_link_allocate_irq()
644 		*triggering = link->irq.triggering;  in acpi_pci_link_allocate_irq()
646 		*polarity = link->irq.polarity;  in acpi_pci_link_allocate_irq()
648 		*name = acpi_device_bid(link->device);  in acpi_pci_link_allocate_irq()
649 	acpi_handle_debug(handle, "Link is referenced\n");  in acpi_pci_link_allocate_irq()
650 	return link->irq.active;  in acpi_pci_link_allocate_irq()
654  * We don't change link's irq information here.  After it is reenabled, we
660 	struct acpi_pci_link *link;  in acpi_pci_link_free_irq()  local
663 		acpi_handle_err(handle, "Invalid link device\n");  in acpi_pci_link_free_irq()
667 	link = acpi_driver_data(device);  in acpi_pci_link_free_irq()
668 	if (!link) {  in acpi_pci_link_free_irq()
669 		acpi_handle_err(handle, "Invalid link context\n");  in acpi_pci_link_free_irq()
674 	if (!link->irq.initialized) {  in acpi_pci_link_free_irq()
676 		acpi_handle_err(handle, "Link isn't initialized\n");  in acpi_pci_link_free_irq()
681 	 * The Link reference count allows us to _DISable an unused link  in acpi_pci_link_free_irq()
684 	 * which blindly restores the link state.  in acpi_pci_link_free_irq()
689 	link->refcnt--;  in acpi_pci_link_free_irq()
691 	acpi_handle_debug(handle, "Link is dereferenced\n");  in acpi_pci_link_free_irq()
693 	if (link->refcnt == 0)  in acpi_pci_link_free_irq()
694 		acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);  in acpi_pci_link_free_irq()
697 	return link->irq.active;  in acpi_pci_link_free_irq()
708 	struct acpi_pci_link *link;  in acpi_pci_link_add()  local
712 	link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);  in acpi_pci_link_add()
713 	if (!link)  in acpi_pci_link_add()
716 	link->device = device;  in acpi_pci_link_add()
719 	device->driver_data = link;  in acpi_pci_link_add()
722 	result = acpi_pci_link_get_possible(link);  in acpi_pci_link_add()
726 	/* query and set link->irq.active */  in acpi_pci_link_add()
727 	acpi_pci_link_get_current(link);  in acpi_pci_link_add()
729 	pr_info("Interrupt link %s configured for IRQ %d\n",  in acpi_pci_link_add()
730 		acpi_device_bid(device), link->irq.active);  in acpi_pci_link_add()
732 	for (i = 0; i < link->irq.possible_count; i++) {  in acpi_pci_link_add()
733 		if (link->irq.active != link->irq.possible[i])  in acpi_pci_link_add()
735 					  link->irq.possible[i]);  in acpi_pci_link_add()
738 	if (!link->device->status.enabled)  in acpi_pci_link_add()
739 		pr_info("Interrupt link %s disabled\n", acpi_device_bid(device));  in acpi_pci_link_add()
741 	list_add_tail(&link->list, &acpi_link_list);  in acpi_pci_link_add()
749 		kfree(link);  in acpi_pci_link_add()
756 static int acpi_pci_link_resume(struct acpi_pci_link *link)  in acpi_pci_link_resume()  argument
758 	if (link->refcnt && link->irq.active && link->irq.initialized)  in acpi_pci_link_resume()
759 		return (acpi_pci_link_set(link, link->irq.active));  in acpi_pci_link_resume()
766 	struct acpi_pci_link *link;  in irqrouter_resume()  local
768 	list_for_each_entry(link, &acpi_link_list, list) {  in irqrouter_resume()
769 		acpi_pci_link_resume(link);  in irqrouter_resume()
775 	struct acpi_pci_link *link;  in acpi_pci_link_remove()  local
777 	link = acpi_driver_data(device);  in acpi_pci_link_remove()
780 	list_del(&link->list);  in acpi_pci_link_remove()
783 	kfree(link);  in acpi_pci_link_remove()