fb979fee7e
- Use a new-bus device driver for the ACPI PCI link devices. The devices are called pci_linkX. The driver includes suspend/resume support so that the ACPI bridge drivers no longer have to poke the links to get them to handle suspend/resume. Also, the code to handle which IRQs a link is routed to and choosing an IRQ when a link is not already routed is all contained in the link driver. The PCI bridge drivers now ask the link driver which IRQ to use once they determine that a _PRT entry does not use a hardwired interrupt number. - The new link driver includes support for multiple IRQ resources per link device as well as preserving any non-IRQ resources when adjusting the IRQ that a link is routed to. - The entire approach to routing when using a link device is now link-centric rather than pci bus/device/pin specific. Thus, when using a tunable to override the default IRQ settings, one now uses a single tunable to route an entire link rather than routing a single device that uses the link (which has great foot-shooting potential if the user tries to route the same link to two different IRQs using two different pci bus/device/pin hints). For example, to adjust the IRQ that \_SB_.LNKA uses, one would set 'hw.pci.link.LNKA.irq=10' from the loader. - As a side effect of having the link driver, unused link devices will now be disabled when they are probed. - The algorithm for choosing an IRQ for a link that doesn't already have an IRQ assigned is now much closer to the one used in $PIR routing. When a link is routed via an ISA IRQ, only known-good IRQs that the BIOS has already used are used for routing instead of using probabilities to guess at which IRQs are probably not used by an ISA device. One change from $PIR is that the SCI is always considered a viable ISA IRQ, so that if the BIOS does not setup any IRQs the kernel will degenerate to routing all interrupts over the SCI. For non ISA IRQs, interrupts are picked from the possible pool using a simplistic weighting algorithm. Tested by: ru, scottl, others on acpi@ Reviewed by: njl
47 lines
1.9 KiB
C
47 lines
1.9 KiB
C
/*-
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* Copyright (c) 2000 Michael Smith
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* Copyright (c) 2000 BSDi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _ACPI_PCIBVAR_H_
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#define _ACPI_PCIBVAR_H_
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int acpi_pcib_attach(device_t bus, ACPI_BUFFER *prt, int busno);
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int acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
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ACPI_BUFFER *prtbuf);
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int acpi_pcib_resume(device_t dev);
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#define MAX_POSSIBLE_INTERRUPTS 16
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#define MAX_ISA_INTERRUPTS 16
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#define MAX_ACPI_INTERRUPTS 255
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void acpi_pci_link_add_reference(device_t dev, int index, device_t pcib,
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int slot, int pin);
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int acpi_pci_link_route_interrupt(device_t dev, int index);
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#endif
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