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Release 4.11 drivers/acpi/pci_link.c

Directory: drivers/acpi
/*
 *  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>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.  See the GNU
 *  General Public License for more details.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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_FILE_INFO		"info"

#define ACPI_PCI_LINK_FILE_STATUS	"state"

#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;
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover25276.83%642.86%


Len Brown329.76%535.71%


Robert Moore185.49%17.14%


Björn Helgaas164.88%17.14%


Patrick Mochel103.05%17.14%


Total328100.00%14100.00%






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_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
		return -ENODEV;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Found %d possible IRQs\n",
			  link->irq.possible_count));

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover6284.93%350.00%


Patrick Mochel68.22%233.33%


Thomas Renninger56.85%116.67%


Total73100.00%6100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover11975.80%430.77%


Len Brown138.28%646.15%


Björn Helgaas127.64%17.69%


Patrick Mochel85.10%17.69%


Robert Moore53.18%17.69%


Total157100.00%13100.00%



/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover15584.24%444.44%


Len Brown189.78%222.22%


Patrick Mochel63.26%222.22%


Thomas Renninger52.72%111.11%


Total184100.00%9100.00%






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.sharable =
			    ACPI_EXCLUSIVE;
		else
			resource->res.data.irq.sharable = 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.irq.sharable =
			    ACPI_EXCLUSIVE;
		else
			resource->res.data.irq.sharable = 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover31054.77%731.82%


Len Brown19834.98%731.82%


Robert Moore213.71%14.55%


Yinghai Lu122.12%14.55%


Thomas Renninger101.77%14.55%


Patrick Mochel81.41%29.09%


Jiri Kosina50.88%14.55%


Burman Yan10.18%14.55%


Dave Jones10.18%14.55%


Total566100.00%22100.00%



/* --------------------------------------------------------------------------
                            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;
}


Contributors
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Sinan Kaya97100.00%2100.00%


Total97100.00%2100.00%






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);
}


Contributors
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Sinan Kaya46100.00%3100.00%


Total46100.00%3100.00%






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;
}


Contributors
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Sinan Kaya130100.00%1100.00%


Total130100.00%1100.00%




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;

		printk(KERN_WARNING PREFIX "%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;
}


Contributors
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Andy Grover13240.74%525.00%


Len Brown10231.48%630.00%


Sinan Kaya309.26%210.00%


David Shaohua Li247.41%210.00%


Jiang Liu237.10%15.00%


Patrick Mochel61.85%15.00%


Frank Seidel51.54%15.00%


Nathan Bryant10.31%15.00%


Thomas Renninger10.31%15.00%


Total324100.00%20100.00%



/*
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover11047.01%433.33%


David Shaohua Li5021.37%18.33%


Len Brown4720.09%325.00%


Patrick Mochel145.98%18.33%


Robert Moore83.42%18.33%


Ingo Molnar41.71%18.33%


Björn Helgaas10.43%18.33%


Total234100.00%12100.00%



/*
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
David Shaohua Li13378.70%222.22%


Len Brown137.69%222.22%


Patrick Mochel127.10%222.22%


Andy Grover63.55%111.11%


Ingo Molnar31.78%111.11%


donald.d.dugger@intel.com21.18%111.11%


Total169100.00%9100.00%



/* --------------------------------------------------------------------------
                                 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover19566.55%316.67%


Len Brown5017.06%316.67%


Rafael J. Wysocki124.10%15.56%


David Shaohua Li103.41%15.56%


Kay Sievers62.05%15.56%


Patrick Mochel51.71%211.11%


Dan Aloni41.37%15.56%


Andrew Morton20.68%15.56%


donald.d.dugger@intel.com20.68%15.56%


Pavel Machek20.68%15.56%


Ingo Molnar20.68%15.56%


Björn Helgaas20.68%15.56%


Burman Yan10.34%15.56%


Total293100.00%18100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds3882.61%133.33%


Patrick Mochel613.04%133.33%


Andy Grover24.35%133.33%


Total46100.00%3100.00%






static void irqrouter_resume(void)
{
	struct acpi_pci_link *link;

	list_for_each_entry(link, &acpi_link_list, list) {
		acpi_pci_link_resume(link);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Nathan Bryant1657.14%120.00%


Linus Torvalds414.29%120.00%


Björn Helgaas414.29%120.00%


Rafael J. Wysocki27.14%120.00%


David Shaohua Li27.14%120.00%


Total28100.00%5100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Grover3368.75%228.57%


David Shaohua Li1020.83%114.29%


Ingo Molnar24.17%114.29%


Rafael J. Wysocki12.08%114.29%


Nathan Bryant12.08%114.29%


Björn Helgaas12.08%114.29%


Total48100.00%7100.00%



/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown7971.17%120.00%


Sinan Kaya2320.72%360.00%


Rafael J. Wysocki98.11%120.00%


Total111100.00%5100.00%



/*
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Sinan Kaya1536.59%555.56%


Rafael J. Wysocki1126.83%111.11%


Len Brown717.07%111.11%


David Shaohua Li512.20%111.11%


Björn Helgaas37.32%111.11%


Total41100.00%9100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Jiang Liu1965.52%120.00%


Sinan Kaya517.24%360.00%


Rafael J. Wysocki517.24%120.00%


Total29100.00%5100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Sinan Kaya37100.00%1100.00%


Total37100.00%1100.00%



/*
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown19100.00%1100.00%


Total19100.00%1100.00%



__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);
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown19100.00%1100.00%


Total19100.00%1100.00%



__setup("acpi_irq_pci=", acpi_irq_pci);




static int __init acpi_irq_nobalance_set(char *str)
{
	acpi_irq_balance = 0;
	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown18100.00%1100.00%


Total18100.00%1100.00%



__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);




static int __init acpi_irq_balance_set(char *str)
{
	acpi_irq_balance = 1;
	return 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown1794.44%150.00%


Roel Kluin15.56%150.00%


Total18100.00%2100.00%



__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);
}

Contributors
PersonTokensPropCommitsCommitProp
Björn Helgaas2550.00%120.00%


Rafael J. Wysocki918.00%120.00%


Andy Grover918.00%120.00%


Patrick Mochel612.00%120.00%


Nathan Bryant12.00%120.00%


Total50100.00%5100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
Andy Grover152244.40%1012.50%


Len Brown72621.18%1923.75%


Sinan Kaya40411.79%1113.75%


David Shaohua Li2547.41%45.00%


Patrick Mochel1033.00%45.00%


Björn Helgaas732.13%56.25%


Rafael J. Wysocki671.95%33.75%


Robert Moore541.58%11.25%


Linus Torvalds441.28%11.25%


Jiang Liu421.23%11.25%


Thomas Renninger421.23%22.50%


Nathan Bryant280.82%11.25%


Ingo Molnar150.44%11.25%


Yinghai Lu120.35%11.25%


Kay Sievers70.20%22.50%


Frank Seidel50.15%11.25%


Jiri Kosina50.15%11.25%


donald.d.dugger@intel.com40.12%11.25%


Dan Aloni40.12%11.25%


Tejun Heo30.09%11.25%


Rashika Kheria30.09%11.25%


Andrew Morton20.06%11.25%


Burman Yan20.06%11.25%


Pavel Machek20.06%11.25%


Roel Kluin10.03%11.25%


Márton Németh10.03%11.25%


Lv Zheng10.03%11.25%


Adrian Bunk10.03%11.25%


Dave Jones10.03%11.25%


Total3428100.00%80100.00%


Directory: drivers/acpi



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