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The LITMUS^RT kernel.

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author	Namhoon Kim <namhoonk@cs.unc.edu>	2016-09-09 16:18:12 -0400
committer	Namhoon Kim <namhoonk@cs.unc.edu>	2016-09-09 16:18:12 -0400
commit	805c547ee3cdc2ef6a5f7556fdf449ced2e48680 (patch)
tree	abeae409739a576291942281f9acf56725d73a1a /include/asm-mips/tlbdebug.h
parent	418e60bb6948a4cf6eb7c737bea21c2314619c73 (diff)

TODO: Fix condition checks in replicate_page_move_mapping()wip-shared-lib

Diffstat (limited to 'include/asm-mips/tlbdebug.h')

0 files changed, 0 insertions, 0 deletions

mit/drivers/acpi/pci_link.c?id=1ba90e3a87c46500623afdc3898573e4a5ebb21b'>1ba90e3a87c4

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/*
 *  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.
 *
 *  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.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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 <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define PREFIX "ACPI: "

#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);
static int acpi_pci_link_remove(struct acpi_device *device, int type);

static const struct acpi_device_id link_device_ids[] = {
	{"PNP0C0F", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, link_device_ids);

static struct acpi_driver acpi_pci_link_driver = {
	.name = "pci_link",
	.class = ACPI_PCI_LINK_CLASS,
	.ids = link_device_ids,
	.ops = {
		.add = acpi_pci_link_add,
		.remove = 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 {
	u8 active;		/* Current IRQ */
	u8 triggering;		/* All IRQs */
	u8 polarity;		/* All IRQs */
	u8 resource_type;
	u8 possible_count;
	u8 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);

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

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 };


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