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bae4a6d8c5
MFC support for PCI Alternate RID Interpretation. ARI is an optional PCIe feature that allows PCI devices to present up to 256 functions on a bus. This is effectively a prerequisite for PCI SR-IOV support. r264007: Add a method to get the PCI RID for a device. Reviewed by: kib MFC after: 2 months Sponsored by: Sandvine Inc. r264008: Re-implement the DMAR I/O MMU code in terms of PCI RIDs Under the hood the VT-d spec is really implemented in terms of PCI RIDs instead of bus/slot/function, even though the spec makes pains to convert back to bus/slot/function in examples. However working with bus/slot/function is not correct when PCI ARI is in use, so convert to using RIDs in most cases. bus/slot/function will only be used when reporting errors to a user. Reviewed by: kib MFC after: 2 months Sponsored by: Sandvine Inc. r264009: Re-write bhyve's I/O MMU handling in terms of PCI RID. Reviewed by: neel MFC after: 2 months Sponsored by: Sandvine Inc. r264011: Add support for PCIe ARI PCIe Alternate RID Interpretation (ARI) is an optional feature that allows devices to have up to 256 different functions. It is implemented by always setting the PCI slot number to 0 and re-purposing the 5 bits used to encode the slot number to instead contain the function number. Combined with the original 3 bits allocated for the function number, this allows for 256 functions. This is enabled by default, but it's expected to be a no-op on currently supported hardware. It's a prerequisite for supporting PCI SR-IOV, and I want the ARI support to go in early to help shake out any bugs in it. ARI can be disabled by setting the tunable hw.pci.enable_ari=0. Reviewed by: kib MFC after: 2 months Sponsored by: Sandvine Inc. r264012: Print status of ARI capability in pciconf -c Teach pciconf how to print out the status (enabled/disabled) of the ARI capability on PCI Root Complexes and Downstream Ports. MFC after: 2 months Sponsored by: Sandvine Inc. r264013: Add missing copyright date. MFC after: 2 months
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/*
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* Copyright (c) 2014 Sandvine Inc. All rights reserved.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Support functions for the PCI:PCI bridge driver. This has to be in a
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* separate file because kernel configurations end up referencing the functions
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* here even when pci support is compiled out of the kernel.
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcib_private.h>
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#include "pcib_if.h"
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int
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pcib_maxfuncs(device_t dev)
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{
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return (PCI_FUNCMAX);
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}
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uint16_t
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pcib_get_rid(device_t pcib, device_t dev)
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{
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uint8_t bus, slot, func;
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bus = pci_get_bus(dev);
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slot = pci_get_slot(dev);
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func = pci_get_function(dev);
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return (PCI_RID(bus, slot, func));
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}
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