697a2d63a3
If there are devices that use interrupts over a suspend event, ACPI must restore the PCI interrupt links on resume. Anything else breaks any device that hasn't been converted to the new (dubious) PM rules. Drivers that need the irq free/re-aquire sequence can be done one by one independently of this one.
969 lines
24 KiB
C
969 lines
24 KiB
C
/*
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* pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* TBD:
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* 1. Support more than one IRQ resource entry per link device (index).
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* 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
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* for IRQ management (e.g. start()->_SRS).
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*/
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#include <linux/sysdev.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/spinlock.h>
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#include <linux/pm.h>
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#include <linux/pci.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_PCI_COMPONENT
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ACPI_MODULE_NAME ("pci_link")
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#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
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#define ACPI_PCI_LINK_HID "PNP0C0F"
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#define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver"
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#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
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#define ACPI_PCI_LINK_FILE_INFO "info"
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#define ACPI_PCI_LINK_FILE_STATUS "state"
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#define ACPI_PCI_LINK_MAX_POSSIBLE 16
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static int acpi_pci_link_add (struct acpi_device *device);
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static int acpi_pci_link_remove (struct acpi_device *device, int type);
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static struct acpi_driver acpi_pci_link_driver = {
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.name = ACPI_PCI_LINK_DRIVER_NAME,
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.class = ACPI_PCI_LINK_CLASS,
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.ids = ACPI_PCI_LINK_HID,
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.ops = {
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.add = acpi_pci_link_add,
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.remove = acpi_pci_link_remove,
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},
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};
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/*
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* If a link is initialized, we never change its active and initialized
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* later even the link is disable. Instead, we just repick the active irq
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*/
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struct acpi_pci_link_irq {
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u8 active; /* Current IRQ */
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u8 edge_level; /* All IRQs */
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u8 active_high_low; /* All IRQs */
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u8 resource_type;
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u8 possible_count;
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u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
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u8 initialized:1;
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u8 reserved:7;
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};
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struct acpi_pci_link {
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struct list_head node;
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struct acpi_device *device;
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acpi_handle handle;
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struct acpi_pci_link_irq irq;
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int refcnt;
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};
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static struct {
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int count;
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struct list_head entries;
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} acpi_link;
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DECLARE_MUTEX(acpi_link_lock);
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/* --------------------------------------------------------------------------
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PCI Link Device Management
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-------------------------------------------------------------------------- */
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/*
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* set context (link) possible list from resource list
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*/
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static acpi_status
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acpi_pci_link_check_possible (
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struct acpi_resource *resource,
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void *context)
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{
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struct acpi_pci_link *link = (struct acpi_pci_link *) context;
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u32 i = 0;
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ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
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switch (resource->id) {
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case ACPI_RSTYPE_START_DPF:
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return_ACPI_STATUS(AE_OK);
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case ACPI_RSTYPE_IRQ:
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{
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struct acpi_resource_irq *p = &resource->data.irq;
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if (!p || !p->number_of_interrupts) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank IRQ resource\n"));
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return_ACPI_STATUS(AE_OK);
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}
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for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
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if (!p->interrupts[i]) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i]));
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continue;
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}
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link->irq.possible[i] = p->interrupts[i];
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link->irq.possible_count++;
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}
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link->irq.edge_level = p->edge_level;
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link->irq.active_high_low = p->active_high_low;
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link->irq.resource_type = ACPI_RSTYPE_IRQ;
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break;
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}
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case ACPI_RSTYPE_EXT_IRQ:
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{
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struct acpi_resource_ext_irq *p = &resource->data.extended_irq;
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if (!p || !p->number_of_interrupts) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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"Blank EXT IRQ resource\n"));
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return_ACPI_STATUS(AE_OK);
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}
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for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
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if (!p->interrupts[i]) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i]));
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continue;
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}
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link->irq.possible[i] = p->interrupts[i];
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link->irq.possible_count++;
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}
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link->irq.edge_level = p->edge_level;
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link->irq.active_high_low = p->active_high_low;
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link->irq.resource_type = ACPI_RSTYPE_EXT_IRQ;
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break;
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}
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Resource is not an IRQ entry\n"));
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return_ACPI_STATUS(AE_OK);
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}
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return_ACPI_STATUS(AE_CTRL_TERMINATE);
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}
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static int
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acpi_pci_link_get_possible (
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struct acpi_pci_link *link)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
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if (!link)
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return_VALUE(-EINVAL);
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status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
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acpi_pci_link_check_possible, link);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n"));
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return_VALUE(-ENODEV);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Found %d possible IRQs\n", link->irq.possible_count));
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return_VALUE(0);
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}
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static acpi_status
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acpi_pci_link_check_current (
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struct acpi_resource *resource,
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void *context)
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{
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int *irq = (int *) context;
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ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
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switch (resource->id) {
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case ACPI_RSTYPE_IRQ:
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{
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struct acpi_resource_irq *p = &resource->data.irq;
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if (!p || !p->number_of_interrupts) {
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/*
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* IRQ descriptors may have no IRQ# bits set,
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* particularly those those w/ _STA disabled
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Blank IRQ resource\n"));
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return_ACPI_STATUS(AE_OK);
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}
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*irq = p->interrupts[0];
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break;
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}
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case ACPI_RSTYPE_EXT_IRQ:
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{
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struct acpi_resource_ext_irq *p = &resource->data.extended_irq;
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if (!p || !p->number_of_interrupts) {
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/*
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* extended IRQ descriptors must
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* return at least 1 IRQ
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*/
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ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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"Blank EXT IRQ resource\n"));
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return_ACPI_STATUS(AE_OK);
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}
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*irq = p->interrupts[0];
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break;
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}
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
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"Resource isn't an IRQ\n"));
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return_ACPI_STATUS(AE_OK);
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}
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return_ACPI_STATUS(AE_CTRL_TERMINATE);
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}
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/*
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* Run _CRS and set link->irq.active
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*
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* return value:
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* 0 - success
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* !0 - failure
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*/
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static int
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acpi_pci_link_get_current (
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struct acpi_pci_link *link)
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{
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int result = 0;
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acpi_status status = AE_OK;
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int irq = 0;
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ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
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if (!link || !link->handle)
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return_VALUE(-EINVAL);
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link->irq.active = 0;
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/* in practice, status disabled is meaningless, ignore it */
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if (acpi_strict) {
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/* Query _STA, set link->device->status */
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result = acpi_bus_get_status(link->device);
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if (result) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
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goto end;
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}
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if (!link->device->status.enabled) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
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return_VALUE(0);
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}
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}
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/*
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* Query and parse _CRS to get the current IRQ assignment.
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*/
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status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
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acpi_pci_link_check_current, &irq);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n"));
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result = -ENODEV;
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goto end;
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}
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if (acpi_strict && !irq) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n"));
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result = -ENODEV;
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}
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link->irq.active = irq;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
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end:
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return_VALUE(result);
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}
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static int
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acpi_pci_link_set (
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struct acpi_pci_link *link,
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int irq)
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{
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int result = 0;
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acpi_status status = AE_OK;
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struct {
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struct acpi_resource res;
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struct acpi_resource end;
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} *resource;
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struct acpi_buffer buffer = {0, NULL};
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ACPI_FUNCTION_TRACE("acpi_pci_link_set");
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if (!link || !irq)
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return_VALUE(-EINVAL);
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resource = kmalloc( sizeof(*resource)+1, GFP_KERNEL);
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if(!resource)
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return_VALUE(-ENOMEM);
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memset(resource, 0, sizeof(*resource)+1);
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buffer.length = sizeof(*resource) +1;
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buffer.pointer = resource;
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switch(link->irq.resource_type) {
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case ACPI_RSTYPE_IRQ:
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resource->res.id = ACPI_RSTYPE_IRQ;
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resource->res.length = sizeof(struct acpi_resource);
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resource->res.data.irq.edge_level = link->irq.edge_level;
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resource->res.data.irq.active_high_low = link->irq.active_high_low;
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if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
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resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
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else
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resource->res.data.irq.shared_exclusive = ACPI_SHARED;
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resource->res.data.irq.number_of_interrupts = 1;
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resource->res.data.irq.interrupts[0] = irq;
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break;
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case ACPI_RSTYPE_EXT_IRQ:
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resource->res.id = ACPI_RSTYPE_EXT_IRQ;
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resource->res.length = sizeof(struct acpi_resource);
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resource->res.data.extended_irq.producer_consumer = ACPI_CONSUMER;
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resource->res.data.extended_irq.edge_level = link->irq.edge_level;
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resource->res.data.extended_irq.active_high_low = link->irq.active_high_low;
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if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
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resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
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else
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resource->res.data.irq.shared_exclusive = ACPI_SHARED;
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resource->res.data.extended_irq.number_of_interrupts = 1;
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resource->res.data.extended_irq.interrupts[0] = irq;
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/* ignore resource_source, it's optional */
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break;
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default:
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printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
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result = -EINVAL;
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goto end;
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}
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resource->end.id = ACPI_RSTYPE_END_TAG;
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/* Attempt to set the resource */
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status = acpi_set_current_resources(link->handle, &buffer);
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/* check for total failure */
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
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result = -ENODEV;
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goto end;
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}
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/* Query _STA, set device->status */
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result = acpi_bus_get_status(link->device);
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if (result) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
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goto end;
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}
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if (!link->device->status.enabled) {
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printk(KERN_WARNING PREFIX
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"%s [%s] disabled and referenced, BIOS bug.\n",
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acpi_device_name(link->device),
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acpi_device_bid(link->device));
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}
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/* Query _CRS, set link->irq.active */
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result = acpi_pci_link_get_current(link);
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if (result) {
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goto end;
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}
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/*
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* Is current setting not what we set?
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* set link->irq.active
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*/
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if (link->irq.active != irq) {
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/*
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* policy: when _CRS doesn't return what we just _SRS
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* assume _SRS worked and override _CRS value.
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*/
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printk(KERN_WARNING PREFIX
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"%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
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acpi_device_name(link->device),
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acpi_device_bid(link->device),
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link->irq.active, irq);
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link->irq.active = irq;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
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end:
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kfree(resource);
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return_VALUE(result);
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}
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/* --------------------------------------------------------------------------
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PCI Link IRQ Management
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-------------------------------------------------------------------------- */
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/*
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* "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
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* Link Devices to move the PIRQs around to minimize sharing.
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*
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* "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
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* that the BIOS has already set to active. This is necessary because
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* ACPI has no automatic means of knowing what ISA IRQs are used. Note that
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* if the BIOS doesn't set a Link Device active, ACPI needs to program it
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* even if acpi_irq_nobalance is set.
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*
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* A tables of penalties avoids directing PCI interrupts to well known
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* ISA IRQs. Boot params are available to over-ride the default table:
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*
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* List interrupts that are free for PCI use.
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* acpi_irq_pci=n[,m]
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*
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* List interrupts that should not be used for PCI:
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* acpi_irq_isa=n[,m]
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*
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* Note that PCI IRQ routers have a list of possible IRQs,
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* which may not include the IRQs this table says are available.
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*
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* Since this heuristic can't tell the difference between a link
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* that no device will attach to, vs. a link which may be shared
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* by multiple active devices -- it is not optimal.
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*
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* If interrupt performance is that important, get an IO-APIC system
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* with a pin dedicated to each device. Or for that matter, an MSI
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* enabled system.
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*/
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#define ACPI_MAX_IRQS 256
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#define ACPI_MAX_ISA_IRQ 16
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#define PIRQ_PENALTY_PCI_AVAILABLE (0)
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#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
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#define PIRQ_PENALTY_PCI_USING (16*16*16)
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#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
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#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
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#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
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static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
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PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
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PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
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PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
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PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
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PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
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PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
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PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
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PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
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PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
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PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
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PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
|
|
/* >IRQ15 */
|
|
};
|
|
|
|
int __init
|
|
acpi_irq_penalty_init(void)
|
|
{
|
|
struct list_head *node = NULL;
|
|
struct acpi_pci_link *link = NULL;
|
|
int i = 0;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
|
|
|
|
/*
|
|
* Update penalties to facilitate IRQ balancing.
|
|
*/
|
|
list_for_each(node, &acpi_link.entries) {
|
|
|
|
link = list_entry(node, struct acpi_pci_link, node);
|
|
if (!link) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* 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_IRQ)
|
|
acpi_irq_penalty[link->irq.possible[i]] += penalty;
|
|
}
|
|
|
|
} else if (link->irq.active) {
|
|
acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_POSSIBLE;
|
|
}
|
|
}
|
|
/* Add a penalty for the SCI */
|
|
acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
static int acpi_irq_balance; /* 0: static, 1: balance */
|
|
|
|
static int acpi_pci_link_allocate(
|
|
struct acpi_pci_link *link)
|
|
{
|
|
int irq;
|
|
int i;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
|
|
|
|
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_VALUE(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_penalty[irq] > acpi_irq_penalty[link->irq.possible[i]])
|
|
irq = link->irq.possible[i];
|
|
}
|
|
}
|
|
|
|
/* Attempt to enable the link device at this IRQ. */
|
|
if (acpi_pci_link_set(link, irq)) {
|
|
printk(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
|
|
"Try pci=noacpi or acpi=off\n",
|
|
acpi_device_name(link->device),
|
|
acpi_device_bid(link->device));
|
|
return_VALUE(-ENODEV);
|
|
} else {
|
|
acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
|
|
printk(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_VALUE(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 *edge_level,
|
|
int *active_high_low,
|
|
char **name)
|
|
{
|
|
int result = 0;
|
|
struct acpi_device *device = NULL;
|
|
struct acpi_pci_link *link = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq");
|
|
|
|
result = acpi_bus_get_device(handle, &device);
|
|
if (result) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
link = (struct acpi_pci_link *) acpi_driver_data(device);
|
|
if (!link) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
/* TBD: Support multiple index (IRQ) entries per Link Device */
|
|
if (index) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
down(&acpi_link_lock);
|
|
if (acpi_pci_link_allocate(link)) {
|
|
up(&acpi_link_lock);
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
if (!link->irq.active) {
|
|
up(&acpi_link_lock);
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
|
|
return_VALUE(-1);
|
|
}
|
|
link->refcnt ++;
|
|
up(&acpi_link_lock);
|
|
|
|
if (edge_level) *edge_level = link->irq.edge_level;
|
|
if (active_high_low) *active_high_low = link->irq.active_high_low;
|
|
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_VALUE(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 = NULL;
|
|
struct acpi_pci_link *link = NULL;
|
|
acpi_status result;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq");
|
|
|
|
result = acpi_bus_get_device(handle, &device);
|
|
if (result) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
link = (struct acpi_pci_link *) acpi_driver_data(device);
|
|
if (!link) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
down(&acpi_link_lock);
|
|
if (!link->irq.initialized) {
|
|
up(&acpi_link_lock);
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n"));
|
|
return_VALUE(-1);
|
|
}
|
|
|
|
link->refcnt --;
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Link %s is dereferenced\n", acpi_device_bid(link->device)));
|
|
|
|
if (link->refcnt == 0) {
|
|
acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
|
|
}
|
|
up(&acpi_link_lock);
|
|
return_VALUE(link->irq.active);
|
|
}
|
|
/* --------------------------------------------------------------------------
|
|
Driver Interface
|
|
-------------------------------------------------------------------------- */
|
|
|
|
static int
|
|
acpi_pci_link_add (
|
|
struct acpi_device *device)
|
|
{
|
|
int result = 0;
|
|
struct acpi_pci_link *link = NULL;
|
|
int i = 0;
|
|
int found = 0;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_pci_link_add");
|
|
|
|
if (!device)
|
|
return_VALUE(-EINVAL);
|
|
|
|
link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
|
|
if (!link)
|
|
return_VALUE(-ENOMEM);
|
|
memset(link, 0, sizeof(struct acpi_pci_link));
|
|
|
|
link->device = device;
|
|
link->handle = device->handle;
|
|
strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
|
|
acpi_driver_data(device) = link;
|
|
|
|
down(&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(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(" *%d", link->irq.possible[i]);
|
|
found = 1;
|
|
}
|
|
else
|
|
printk(" %d", link->irq.possible[i]);
|
|
}
|
|
|
|
printk(")");
|
|
|
|
if (!found)
|
|
printk(" *%d", link->irq.active);
|
|
|
|
if(!link->device->status.enabled)
|
|
printk(", disabled.");
|
|
|
|
printk("\n");
|
|
|
|
/* TBD: Acquire/release lock */
|
|
list_add_tail(&link->node, &acpi_link.entries);
|
|
acpi_link.count++;
|
|
|
|
end:
|
|
/* disable all links -- to be activated on use */
|
|
acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
|
|
up(&acpi_link_lock);
|
|
|
|
if (result)
|
|
kfree(link);
|
|
|
|
return_VALUE(result);
|
|
}
|
|
|
|
static int
|
|
acpi_pci_link_resume(
|
|
struct acpi_pci_link *link)
|
|
{
|
|
ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
|
|
|
|
if (link->refcnt && link->irq.active && link->irq.initialized)
|
|
return_VALUE(acpi_pci_link_set(link, link->irq.active));
|
|
else
|
|
return_VALUE(0);
|
|
}
|
|
|
|
static int
|
|
irqrouter_resume(
|
|
struct sys_device *dev)
|
|
{
|
|
struct list_head *node = NULL;
|
|
struct acpi_pci_link *link = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("irqrouter_resume");
|
|
|
|
list_for_each(node, &acpi_link.entries) {
|
|
link = list_entry(node, struct acpi_pci_link, node);
|
|
if (!link) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
|
|
"Invalid link context\n"));
|
|
continue;
|
|
}
|
|
acpi_pci_link_resume(link);
|
|
}
|
|
return_VALUE(0);
|
|
}
|
|
|
|
|
|
static int
|
|
acpi_pci_link_remove (
|
|
struct acpi_device *device,
|
|
int type)
|
|
{
|
|
struct acpi_pci_link *link = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return_VALUE(-EINVAL);
|
|
|
|
link = (struct acpi_pci_link *) acpi_driver_data(device);
|
|
|
|
down(&acpi_link_lock);
|
|
list_del(&link->node);
|
|
up(&acpi_link_lock);
|
|
|
|
kfree(link);
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
/*
|
|
* modify acpi_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;
|
|
|
|
retval = get_option(&str,&irq);
|
|
|
|
if (!retval)
|
|
break; /* no number found */
|
|
|
|
if (irq < 0)
|
|
continue;
|
|
|
|
if (irq >= ACPI_MAX_IRQS)
|
|
continue;
|
|
|
|
if (used)
|
|
acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
|
|
else
|
|
acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
|
|
|
|
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 (active)
|
|
acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
|
|
else
|
|
acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
int __init acpi_irq_balance_set(char *str)
|
|
{
|
|
acpi_irq_balance = 1;
|
|
return 1;
|
|
}
|
|
__setup("acpi_irq_balance", acpi_irq_balance_set);
|
|
|
|
|
|
/* FIXME: we will remove this interface after all drivers call pci_disable_device */
|
|
static struct sysdev_class irqrouter_sysdev_class = {
|
|
set_kset_name("irqrouter"),
|
|
.resume = irqrouter_resume,
|
|
};
|
|
|
|
|
|
static struct sys_device device_irqrouter = {
|
|
.id = 0,
|
|
.cls = &irqrouter_sysdev_class,
|
|
};
|
|
|
|
|
|
static int __init irqrouter_init_sysfs(void)
|
|
{
|
|
int error;
|
|
|
|
ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
|
|
|
|
if (acpi_disabled || acpi_noirq)
|
|
return_VALUE(0);
|
|
|
|
error = sysdev_class_register(&irqrouter_sysdev_class);
|
|
if (!error)
|
|
error = sysdev_register(&device_irqrouter);
|
|
|
|
return_VALUE(error);
|
|
}
|
|
|
|
device_initcall(irqrouter_init_sysfs);
|
|
|
|
|
|
static int __init acpi_pci_link_init (void)
|
|
{
|
|
ACPI_FUNCTION_TRACE("acpi_pci_link_init");
|
|
|
|
if (acpi_noirq)
|
|
return_VALUE(0);
|
|
|
|
acpi_link.count = 0;
|
|
INIT_LIST_HEAD(&acpi_link.entries);
|
|
|
|
if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
|
|
return_VALUE(-ENODEV);
|
|
|
|
return_VALUE(0);
|
|
}
|
|
|
|
subsys_initcall(acpi_pci_link_init);
|