diff options
Diffstat (limited to 'drivers/acpi/pci_link.c')
| -rw-r--r-- | drivers/acpi/pci_link.c | 931 |
1 files changed, 931 insertions, 0 deletions
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c new file mode 100644 index 000000000..fb4c5632a --- /dev/null +++ b/drivers/acpi/pci_link.c @@ -0,0 +1,931 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $) + * + * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> + * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> + * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de> + * + * TBD: + * 1. Support more than one IRQ resource entry per link device (index). + * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities + * for IRQ management (e.g. start()->_SRS). + */ + +#include <linux/syscore_ops.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/spinlock.h> +#include <linux/pm.h> +#include <linux/pci.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/acpi.h> +#include <linux/irq.h> + +#include "internal.h" + +#define _COMPONENT ACPI_PCI_COMPONENT +ACPI_MODULE_NAME("pci_link"); +#define ACPI_PCI_LINK_CLASS "pci_irq_routing" +#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link" +#define ACPI_PCI_LINK_MAX_POSSIBLE 16 + +static int acpi_pci_link_add(struct acpi_device *device, + const struct acpi_device_id *not_used); +static void acpi_pci_link_remove(struct acpi_device *device); + +static const struct acpi_device_id link_device_ids[] = { + {"PNP0C0F", 0}, + {"", 0}, +}; + +static struct acpi_scan_handler pci_link_handler = { + .ids = link_device_ids, + .attach = acpi_pci_link_add, + .detach = acpi_pci_link_remove, +}; + +/* + * If a link is initialized, we never change its active and initialized + * later even the link is disable. Instead, we just repick the active irq + */ +struct acpi_pci_link_irq { + u32 active; /* Current IRQ */ + u8 triggering; /* All IRQs */ + u8 polarity; /* All IRQs */ + u8 resource_type; + u8 possible_count; + u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; + u8 initialized:1; + u8 reserved:7; +}; + +struct acpi_pci_link { + struct list_head list; + struct acpi_device *device; + struct acpi_pci_link_irq irq; + int refcnt; +}; + +static LIST_HEAD(acpi_link_list); +static DEFINE_MUTEX(acpi_link_lock); +static int sci_irq = -1, sci_penalty; + +/* -------------------------------------------------------------------------- + PCI Link Device Management + -------------------------------------------------------------------------- */ + +/* + * set context (link) possible list from resource list + */ +static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource, + void *context) +{ + struct acpi_pci_link *link = context; + u32 i; + + switch (resource->type) { + case ACPI_RESOURCE_TYPE_START_DEPENDENT: + case ACPI_RESOURCE_TYPE_END_TAG: + return AE_OK; + case ACPI_RESOURCE_TYPE_IRQ: + { + struct acpi_resource_irq *p = &resource->data.irq; + if (!p || !p->interrupt_count) { + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Blank _PRS IRQ resource\n")); + return AE_OK; + } + for (i = 0; + (i < p->interrupt_count + && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { + if (!p->interrupts[i]) { + printk(KERN_WARNING PREFIX + "Invalid _PRS IRQ %d\n", + p->interrupts[i]); + continue; + } + link->irq.possible[i] = p->interrupts[i]; + link->irq.possible_count++; + } + link->irq.triggering = p->triggering; + link->irq.polarity = p->polarity; + link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; + break; + } + case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: + { + struct acpi_resource_extended_irq *p = + &resource->data.extended_irq; + if (!p || !p->interrupt_count) { + printk(KERN_WARNING PREFIX + "Blank _PRS EXT IRQ resource\n"); + return AE_OK; + } + for (i = 0; + (i < p->interrupt_count + && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { + if (!p->interrupts[i]) { + printk(KERN_WARNING PREFIX + "Invalid _PRS IRQ %d\n", + p->interrupts[i]); + continue; + } + link->irq.possible[i] = p->interrupts[i]; + link->irq.possible_count++; + } + link->irq.triggering = p->triggering; + link->irq.polarity = p->polarity; + link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; + break; + } + default: + printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n", + resource->type); + return AE_OK; + } + + return AE_CTRL_TERMINATE; +} + +static int acpi_pci_link_get_possible(struct acpi_pci_link *link) +{ + acpi_status status; + + status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, + acpi_pci_link_check_possible, link); + if (ACPI_FAILURE(status)) { + acpi_handle_debug(link->device->handle, "_PRS not present or invalid"); + return 0; + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Found %d possible IRQs\n", + link->irq.possible_count)); + + return 0; +} + +static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource, + void *context) +{ + int *irq = context; + + switch (resource->type) { + case ACPI_RESOURCE_TYPE_START_DEPENDENT: + case ACPI_RESOURCE_TYPE_END_TAG: + return AE_OK; + case ACPI_RESOURCE_TYPE_IRQ: + { + struct acpi_resource_irq *p = &resource->data.irq; + if (!p || !p->interrupt_count) { + /* + * IRQ descriptors may have no IRQ# bits set, + * particularly those those w/ _STA disabled + */ + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Blank _CRS IRQ resource\n")); + return AE_OK; + } + *irq = p->interrupts[0]; + break; + } + case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: + { + struct acpi_resource_extended_irq *p = + &resource->data.extended_irq; + if (!p || !p->interrupt_count) { + /* + * extended IRQ descriptors must + * return at least 1 IRQ + */ + printk(KERN_WARNING PREFIX + "Blank _CRS EXT IRQ resource\n"); + return AE_OK; + } + *irq = p->interrupts[0]; + break; + } + break; + default: + printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n", + resource->type); + return AE_OK; + } + + return AE_CTRL_TERMINATE; +} + +/* + * Run _CRS and set link->irq.active + * + * return value: + * 0 - success + * !0 - failure + */ +static int acpi_pci_link_get_current(struct acpi_pci_link *link) +{ + int result = 0; + acpi_status status; + int irq = 0; + + link->irq.active = 0; + + /* in practice, status disabled is meaningless, ignore it */ + if (acpi_strict) { + /* Query _STA, set link->device->status */ + result = acpi_bus_get_status(link->device); + if (result) { + printk(KERN_ERR PREFIX "Unable to read status\n"); + goto end; + } + + if (!link->device->status.enabled) { + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); + return 0; + } + } + + /* + * Query and parse _CRS to get the current IRQ assignment. + */ + + status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, + acpi_pci_link_check_current, &irq); + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); + result = -ENODEV; + goto end; + } + + if (acpi_strict && !irq) { + printk(KERN_ERR PREFIX "_CRS returned 0\n"); + result = -ENODEV; + } + + link->irq.active = irq; + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); + + end: + return result; +} + +static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) +{ + int result; + acpi_status status; + struct { + struct acpi_resource res; + struct acpi_resource end; + } *resource; + struct acpi_buffer buffer = { 0, NULL }; + + if (!irq) + return -EINVAL; + + resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); + if (!resource) + return -ENOMEM; + + buffer.length = sizeof(*resource) + 1; + buffer.pointer = resource; + + switch (link->irq.resource_type) { + case ACPI_RESOURCE_TYPE_IRQ: + resource->res.type = ACPI_RESOURCE_TYPE_IRQ; + resource->res.length = sizeof(struct acpi_resource); + resource->res.data.irq.triggering = link->irq.triggering; + resource->res.data.irq.polarity = + link->irq.polarity; + if (link->irq.triggering == ACPI_EDGE_SENSITIVE) + resource->res.data.irq.shareable = + ACPI_EXCLUSIVE; + else + resource->res.data.irq.shareable = ACPI_SHARED; + resource->res.data.irq.interrupt_count = 1; + resource->res.data.irq.interrupts[0] = irq; + break; + + case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: + resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; + resource->res.length = sizeof(struct acpi_resource); + resource->res.data.extended_irq.producer_consumer = + ACPI_CONSUMER; + resource->res.data.extended_irq.triggering = + link->irq.triggering; + resource->res.data.extended_irq.polarity = + link->irq.polarity; + if (link->irq.triggering == ACPI_EDGE_SENSITIVE) + resource->res.data.extended_irq.shareable = + ACPI_EXCLUSIVE; + else + resource->res.data.extended_irq.shareable = ACPI_SHARED; + resource->res.data.extended_irq.interrupt_count = 1; + resource->res.data.extended_irq.interrupts[0] = irq; + /* ignore resource_source, it's optional */ + break; + default: + printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); + result = -EINVAL; + goto end; + + } + resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; + resource->end.length = sizeof(struct acpi_resource); + + /* Attempt to set the resource */ + status = acpi_set_current_resources(link->device->handle, &buffer); + + /* check for total failure */ + if (ACPI_FAILURE(status)) { + ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); + result = -ENODEV; + goto end; + } + + /* Query _STA, set device->status */ + result = acpi_bus_get_status(link->device); + if (result) { + printk(KERN_ERR PREFIX "Unable to read status\n"); + goto end; + } + if (!link->device->status.enabled) { + printk(KERN_WARNING PREFIX + "%s [%s] disabled and referenced, BIOS bug\n", + acpi_device_name(link->device), + acpi_device_bid(link->device)); + } + + /* Query _CRS, set link->irq.active */ + result = acpi_pci_link_get_current(link); + if (result) { + goto end; + } + + /* + * Is current setting not what we set? + * set link->irq.active + */ + if (link->irq.active != irq) { + /* + * policy: when _CRS doesn't return what we just _SRS + * assume _SRS worked and override _CRS value. + */ + printk(KERN_WARNING PREFIX + "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", + acpi_device_name(link->device), + acpi_device_bid(link->device), link->irq.active, irq); + link->irq.active = irq; + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); + + end: + kfree(resource); + return result; +} + +/* -------------------------------------------------------------------------- + PCI Link IRQ Management + -------------------------------------------------------------------------- */ + +/* + * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt + * Link Devices to move the PIRQs around to minimize sharing. + * + * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs + * that the BIOS has already set to active. This is necessary because + * ACPI has no automatic means of knowing what ISA IRQs are used. Note that + * if the BIOS doesn't set a Link Device active, ACPI needs to program it + * even if acpi_irq_nobalance is set. + * + * A tables of penalties avoids directing PCI interrupts to well known + * ISA IRQs. Boot params are available to over-ride the default table: + * + * List interrupts that are free for PCI use. + * acpi_irq_pci=n[,m] + * + * List interrupts that should not be used for PCI: + * acpi_irq_isa=n[,m] + * + * Note that PCI IRQ routers have a list of possible IRQs, + * which may not include the IRQs this table says are available. + * + * Since this heuristic can't tell the difference between a link + * that no device will attach to, vs. a link which may be shared + * by multiple active devices -- it is not optimal. + * + * If interrupt performance is that important, get an IO-APIC system + * with a pin dedicated to each device. Or for that matter, an MSI + * enabled system. + */ + +#define ACPI_MAX_ISA_IRQS 16 + +#define PIRQ_PENALTY_PCI_POSSIBLE (16*16) +#define PIRQ_PENALTY_PCI_USING (16*16*16) +#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) +#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) +#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) + +static int acpi_isa_irq_penalty[ACPI_MAX_ISA_IRQS] = { + PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ + PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ + PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ + PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ + PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ + PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ + PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ + PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ + PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ + 0, /* IRQ9 PCI, often acpi */ + 0, /* IRQ10 PCI */ + 0, /* IRQ11 PCI */ + PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ + PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ + PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ + PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ + /* >IRQ15 */ +}; + +static int acpi_irq_pci_sharing_penalty(int irq) +{ + struct acpi_pci_link *link; + int penalty = 0; + int i; + + list_for_each_entry(link, &acpi_link_list, list) { + /* + * If a link is active, penalize its IRQ heavily + * so we try to choose a different IRQ. + */ + if (link->irq.active && link->irq.active == irq) + penalty += PIRQ_PENALTY_PCI_USING; + + /* + * penalize the IRQs PCI might use, but not as severely. + */ + for (i = 0; i < link->irq.possible_count; i++) + if (link->irq.possible[i] == irq) + penalty += PIRQ_PENALTY_PCI_POSSIBLE / + link->irq.possible_count; + } + + return penalty; +} + +static int acpi_irq_get_penalty(int irq) +{ + int penalty = 0; + + if (irq == sci_irq) + penalty += sci_penalty; + + if (irq < ACPI_MAX_ISA_IRQS) + return penalty + acpi_isa_irq_penalty[irq]; + + return penalty + acpi_irq_pci_sharing_penalty(irq); +} + +int __init acpi_irq_penalty_init(void) +{ + struct acpi_pci_link *link; + int i; + + /* + * Update penalties to facilitate IRQ balancing. + */ + list_for_each_entry(link, &acpi_link_list, list) { + + /* + * reflect the possible and active irqs in the penalty table -- + * useful for breaking ties. + */ + if (link->irq.possible_count) { + int penalty = + PIRQ_PENALTY_PCI_POSSIBLE / + link->irq.possible_count; + + for (i = 0; i < link->irq.possible_count; i++) { + if (link->irq.possible[i] < ACPI_MAX_ISA_IRQS) + acpi_isa_irq_penalty[link->irq. + possible[i]] += + penalty; + } + + } else if (link->irq.active && + (link->irq.active < ACPI_MAX_ISA_IRQS)) { + acpi_isa_irq_penalty[link->irq.active] += + PIRQ_PENALTY_PCI_POSSIBLE; + } + } + + return 0; +} + +static int acpi_irq_balance = -1; /* 0: static, 1: balance */ + +static int acpi_pci_link_allocate(struct acpi_pci_link *link) +{ + int irq; + int i; + + if (link->irq.initialized) { + if (link->refcnt == 0) + /* This means the link is disabled but initialized */ + acpi_pci_link_set(link, link->irq.active); + return 0; + } + + /* + * search for active IRQ in list of possible IRQs. + */ + for (i = 0; i < link->irq.possible_count; ++i) { + if (link->irq.active == link->irq.possible[i]) + break; + } + /* + * forget active IRQ that is not in possible list + */ + if (i == link->irq.possible_count) { + if (acpi_strict) + printk(KERN_WARNING PREFIX "_CRS %d not found" + " in _PRS\n", link->irq.active); + link->irq.active = 0; + } + + /* + * if active found, use it; else pick entry from end of possible list. + */ + if (link->irq.active) + irq = link->irq.active; + else + irq = link->irq.possible[link->irq.possible_count - 1]; + + if (acpi_irq_balance || !link->irq.active) { + /* + * Select the best IRQ. This is done in reverse to promote + * the use of IRQs 9, 10, 11, and >15. + */ + for (i = (link->irq.possible_count - 1); i >= 0; i--) { + if (acpi_irq_get_penalty(irq) > + acpi_irq_get_penalty(link->irq.possible[i])) + irq = link->irq.possible[i]; + } + } + if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) { + printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. " + "Try pci=noacpi or acpi=off\n", + acpi_device_name(link->device), + acpi_device_bid(link->device)); + return -ENODEV; + } + + /* Attempt to enable the link device at this IRQ. */ + if (acpi_pci_link_set(link, irq)) { + printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " + "Try pci=noacpi or acpi=off\n", + acpi_device_name(link->device), + acpi_device_bid(link->device)); + return -ENODEV; + } else { + if (link->irq.active < ACPI_MAX_ISA_IRQS) + acpi_isa_irq_penalty[link->irq.active] += + PIRQ_PENALTY_PCI_USING; + + pr_info("%s [%s] enabled at IRQ %d\n", + acpi_device_name(link->device), + acpi_device_bid(link->device), link->irq.active); + } + + link->irq.initialized = 1; + return 0; +} + +/* + * acpi_pci_link_allocate_irq + * success: return IRQ >= 0 + * failure: return -1 + */ +int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering, + int *polarity, char **name) +{ + int result; + struct acpi_device *device; + struct acpi_pci_link *link; + + result = acpi_bus_get_device(handle, &device); + if (result) { + printk(KERN_ERR PREFIX "Invalid link device\n"); + return -1; + } + + link = acpi_driver_data(device); + if (!link) { + printk(KERN_ERR PREFIX "Invalid link context\n"); + return -1; + } + + /* TBD: Support multiple index (IRQ) entries per Link Device */ + if (index) { + printk(KERN_ERR PREFIX "Invalid index %d\n", index); + return -1; + } + + mutex_lock(&acpi_link_lock); + if (acpi_pci_link_allocate(link)) { + mutex_unlock(&acpi_link_lock); + return -1; + } + + if (!link->irq.active) { + mutex_unlock(&acpi_link_lock); + printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); + return -1; + } + link->refcnt++; + mutex_unlock(&acpi_link_lock); + + if (triggering) + *triggering = link->irq.triggering; + if (polarity) + *polarity = link->irq.polarity; + if (name) + *name = acpi_device_bid(link->device); + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Link %s is referenced\n", + acpi_device_bid(link->device))); + return link->irq.active; +} + +/* + * We don't change link's irq information here. After it is reenabled, we + * continue use the info + */ +int acpi_pci_link_free_irq(acpi_handle handle) +{ + struct acpi_device *device; + struct acpi_pci_link *link; + acpi_status result; + + result = acpi_bus_get_device(handle, &device); + if (result) { + printk(KERN_ERR PREFIX "Invalid link device\n"); + return -1; + } + + link = acpi_driver_data(device); + if (!link) { + printk(KERN_ERR PREFIX "Invalid link context\n"); + return -1; + } + + mutex_lock(&acpi_link_lock); + if (!link->irq.initialized) { + mutex_unlock(&acpi_link_lock); + printk(KERN_ERR PREFIX "Link isn't initialized\n"); + return -1; + } +#ifdef FUTURE_USE + /* + * The Link reference count allows us to _DISable an unused link + * and suspend time, and set it again on resume. + * However, 2.6.12 still has irq_router.resume + * which blindly restores the link state. + * So we disable the reference count method + * to prevent duplicate acpi_pci_link_set() + * which would harm some systems + */ + link->refcnt--; +#endif + ACPI_DEBUG_PRINT((ACPI_DB_INFO, + "Link %s is dereferenced\n", + acpi_device_bid(link->device))); + + if (link->refcnt == 0) + acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL); + + mutex_unlock(&acpi_link_lock); + return link->irq.active; +} + +/* -------------------------------------------------------------------------- + Driver Interface + -------------------------------------------------------------------------- */ + +static int acpi_pci_link_add(struct acpi_device *device, + const struct acpi_device_id *not_used) +{ + int result; + struct acpi_pci_link *link; + int i; + int found = 0; + + link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); + if (!link) + return -ENOMEM; + + link->device = device; + strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); + device->driver_data = link; + + mutex_lock(&acpi_link_lock); + result = acpi_pci_link_get_possible(link); + if (result) + goto end; + + /* query and set link->irq.active */ + acpi_pci_link_get_current(link); + + printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), + acpi_device_bid(device)); + for (i = 0; i < link->irq.possible_count; i++) { + if (link->irq.active == link->irq.possible[i]) { + printk(KERN_CONT " *%d", link->irq.possible[i]); + found = 1; + } else + printk(KERN_CONT " %d", link->irq.possible[i]); + } + + printk(KERN_CONT ")"); + + if (!found) + printk(KERN_CONT " *%d", link->irq.active); + + if (!link->device->status.enabled) + printk(KERN_CONT ", disabled."); + + printk(KERN_CONT "\n"); + + list_add_tail(&link->list, &acpi_link_list); + + end: + /* disable all links -- to be activated on use */ + acpi_evaluate_object(device->handle, "_DIS", NULL, NULL); + mutex_unlock(&acpi_link_lock); + + if (result) + kfree(link); + + return result < 0 ? result : 1; +} + +static int acpi_pci_link_resume(struct acpi_pci_link *link) +{ + if (link->refcnt && link->irq.active && link->irq.initialized) + return (acpi_pci_link_set(link, link->irq.active)); + + return 0; +} + +static void irqrouter_resume(void) +{ + struct acpi_pci_link *link; + + list_for_each_entry(link, &acpi_link_list, list) { + acpi_pci_link_resume(link); + } +} + +static void acpi_pci_link_remove(struct acpi_device *device) +{ + struct acpi_pci_link *link; + + link = acpi_driver_data(device); + + mutex_lock(&acpi_link_lock); + list_del(&link->list); + mutex_unlock(&acpi_link_lock); + + kfree(link); +} + +/* + * modify acpi_isa_irq_penalty[] from cmdline + */ +static int __init acpi_irq_penalty_update(char *str, int used) +{ + int i; + + for (i = 0; i < 16; i++) { + int retval; + int irq; + int new_penalty; + + retval = get_option(&str, &irq); + + if (!retval) + break; /* no number found */ + + /* see if this is a ISA IRQ */ + if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS)) + continue; + + if (used) + new_penalty = acpi_isa_irq_penalty[irq] + + PIRQ_PENALTY_ISA_USED; + else + new_penalty = 0; + + acpi_isa_irq_penalty[irq] = new_penalty; + if (retval != 2) /* no next number */ + break; + } + return 1; +} + +/* + * We'd like PNP to call this routine for the + * single ISA_USED value for each legacy device. + * But instead it calls us with each POSSIBLE setting. + * There is no ISA_POSSIBLE weight, so we simply use + * the (small) PCI_USING penalty. + */ +void acpi_penalize_isa_irq(int irq, int active) +{ + if ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty))) + acpi_isa_irq_penalty[irq] += + (active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING); +} + +bool acpi_isa_irq_available(int irq) +{ + return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) || + acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS); +} + +void acpi_penalize_sci_irq(int irq, int trigger, int polarity) +{ + sci_irq = irq; + + if (trigger == ACPI_MADT_TRIGGER_LEVEL && + polarity == ACPI_MADT_POLARITY_ACTIVE_LOW) + sci_penalty = PIRQ_PENALTY_PCI_USING; + else + sci_penalty = PIRQ_PENALTY_ISA_ALWAYS; +} + +/* + * Over-ride default table to reserve additional IRQs for use by ISA + * e.g. acpi_irq_isa=5 + * Useful for telling ACPI how not to interfere with your ISA sound card. + */ +static int __init acpi_irq_isa(char *str) +{ + return acpi_irq_penalty_update(str, 1); +} + +__setup("acpi_irq_isa=", acpi_irq_isa); + +/* + * Over-ride default table to free additional IRQs for use by PCI + * e.g. acpi_irq_pci=7,15 + * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. + */ +static int __init acpi_irq_pci(char *str) +{ + return acpi_irq_penalty_update(str, 0); +} + +__setup("acpi_irq_pci=", acpi_irq_pci); + +static int __init acpi_irq_nobalance_set(char *str) +{ + acpi_irq_balance = 0; + return 1; +} + +__setup("acpi_irq_nobalance", acpi_irq_nobalance_set); + +static int __init acpi_irq_balance_set(char *str) +{ + acpi_irq_balance = 1; + return 1; +} + +__setup("acpi_irq_balance", acpi_irq_balance_set); + +static struct syscore_ops irqrouter_syscore_ops = { + .resume = irqrouter_resume, +}; + +void __init acpi_pci_link_init(void) +{ + if (acpi_noirq) + return; + + if (acpi_irq_balance == -1) { + /* no command line switch: enable balancing in IOAPIC mode */ + if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) + acpi_irq_balance = 1; + else + acpi_irq_balance = 0; + } + register_syscore_ops(&irqrouter_syscore_ops); + acpi_scan_add_handler(&pci_link_handler); +} |