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hyperv/pcib: enable PCIe pass-through (a.k.a. Discrete Device Assignment)

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The feature enables us to pass through physical PCIe devices to FreeBSD VM
running on Hyper-V (Windows Server 2016) to get near-native performance with
low CPU utilization.

The patch implements a PCI bridge driver to support the feature:

1) The pcib driver talks to the host to discover device(s) and presents
the device(s) to FreeBSD's pci driver via PCI configuration space (note:
to access the configuration space, we don't use the standard I/O port
0xCF8/CFC method; instead, we use an MMIO-based method supplied by Hyper-V,
which is very similar to the 0xCF8/CFC method).

2) The pcib driver allocates resources for the device(s) and initialize
the related BARs, when the device driver's attach method is invoked;

3) The pcib driver talks to the host to create MSI/MSI-X interrupt
remapping between the guest and the host;

4) The pcib driver supports device hot add/remove.

Reviewed by:	sephe
Approved by:	sephe (mentor)
MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D8332
This commit is contained in:
Dexuan Cui 2016-11-16 09:25:00 +00:00
parent 522c192d38
commit 871c968b3a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=308725
4 changed files with 1804 additions and 0 deletions
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1
sys/conf/files.amd64
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@ -292,6 +292,7 @@ dev/hwpmc/hwpmc_uncore.c optional hwpmc
dev/hwpmc/hwpmc_piv.c optional hwpmc
dev/hwpmc/hwpmc_tsc.c optional hwpmc
dev/hwpmc/hwpmc_x86.c optional hwpmc
dev/hyperv/pcib/pcib.c optional hyperv
dev/hyperv/netvsc/hn_nvs.c optional hyperv
dev/hyperv/netvsc/hn_rndis.c optional hyperv
dev/hyperv/netvsc/if_hn.c optional hyperv

1
sys/conf/files.i386
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@ -249,6 +249,7 @@ dev/hwpmc/hwpmc_piv.c optional hwpmc
dev/hwpmc/hwpmc_ppro.c optional hwpmc
dev/hwpmc/hwpmc_tsc.c optional hwpmc
dev/hwpmc/hwpmc_x86.c optional hwpmc
dev/hyperv/pcib/pcib.c optional hyperv
dev/hyperv/netvsc/hn_nvs.c optional hyperv
dev/hyperv/netvsc/hn_rndis.c optional hyperv
dev/hyperv/netvsc/if_hn.c optional hyperv

1790
sys/dev/hyperv/pcib/pcib.c Normal file
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12
sys/modules/hyperv/pcib/Makefile Normal file
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@ -0,0 +1,12 @@
# $FreeBSD$
.PATH: ${.CURDIR}/../../../dev/hyperv/pcib \
${.CURDIR}/../../../dev/hyperv/vmbus
KMOD= vmbus_pcib
SRCS= pcib.c
SRCS+= bus_if.h device_if.h vmbus_if.h
CFLAGS+= -I${.CURDIR}/../../../dev/hyperv/pcib
.include <bsd.kmod.mk>