Bjorn,

This patch set is tested on 3.19-rc1 and with the offset/stride update patch.

I see your comment on the MEM64 issue, so if that is reverted, this
patch set will not work. While I think we can work in parallel, I sent it here
for more comment and to see whether I understand your previous comments
correctly.

I will work with Yinghai to find a way to fix the bug 85491, hope linux kernel
could handle both cases.

Merry Christmas in advance ~

On Mon, Dec 22, 2014 at 01:54:20PM +0800, Wei Yang wrote:

This patchset enables the SRIOV on POWER8.

The gerneral idea is put each VF into one individual PE and allocate required
resources like MMIO/DMA/MSI. The major difficulty comes from the MMIO
allocation and adjustment for PF's IOV BAR.

On P8, we use M64BT to cover a PF's IOV BAR, which could make an individual VF
sit in its own PE. This gives more flexiblity, while at the mean time it
brings on some restrictions on the PF's IOV BAR size and alignment.

To achieve this effect, we need to do some hack on pci devices's resources.
1. Expand the IOV BAR properly.
  Done by pnv_pci_ioda_fixup_iov_resources().
2. Shift the IOV BAR properly.
  Done by pnv_pci_vf_resource_shift().
3. IOV BAR alignment is calculated by arch dependent function instead of an
  individual VF BAR size.
  Done by pnv_pcibios_sriov_resource_alignment().
4. Take the IOV BAR alignment into consideration in the sizing and assigning.
  This is achieved by commit: "PCI: Take additional IOV BAR alignment in
  sizing and assigning"

Test Environment:
      The SRIOV device tested is Emulex Lancer(10df:e220) and
      Mellanox ConnectX-3(15b3:1003) on POWER8.

Examples on pass through a VF to guest through vfio:
1. unbind the original driver and bind to vfio-pci driver
   echo 0000:06:0d.0 > /sys/bus/pci/devices/0000:06:0d.0/driver/unbind
   echo  1102 0002 > /sys/bus/pci/drivers/vfio-pci/new_id
   Note: this should be done for each device in the same iommu_group
2. Start qemu and pass device through vfio
   /home/ywywyang/git/qemu-impreza/ppc64-softmmu/qemu-system-ppc64 \
	   -M pseries -m 2048 -enable-kvm -nographic \
	   -drive file=/home/ywywyang/kvm/fc19.img \
	   -monitor telnet:localhost:5435,server,nowait -boot cd \
	   -device "spapr-pci-vfio-host-bridge,id=CXGB3,iommu=26,index=6"

Verify this is the exact VF response:
1. ping from a machine in the same subnet(the broadcast domain)
2. run arp -n on this machine
   9.115.251.20             ether   00:00:c9:df:ed:bf   C eth0
3. ifconfig in the guest
   # ifconfig eth1
   eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 9.115.251.20  netmask 255.255.255.0  broadcast 9.115.251.255
	inet6 fe80::200:c9ff:fedf:edbf  prefixlen 64  scopeid 0x20<link>
        ether 00:00:c9:df:ed:bf  txqueuelen 1000 (Ethernet)
        RX packets 175  bytes 13278 (12.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
	TX packets 58  bytes 9276 (9.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
4. They have the same MAC address

Note: make sure you shutdown other network interfaces in guest.

---
v10:
  * remove weak function pcibios_iov_resource_size()
    the VF BAR size is stored in pci_sriov structure and retrieved from
    pci_iov_resource_size()
  * Use "Reserve additional" instead of "Expand" to be more acurate in the
    change log
  * add log message to show the PF's IOV BAR final size
  * add pcibios_sriov_enable/disable() weak funcion in sriov_enable/disable()
    for arch setup before enable VFs. Like the arch could fix up the BDF for
    VFs, since the change of NumVFs would affect the BDF of VFs.
  * Add some explanation of PE on Power arch in the documentation
v9:
  * make the change log consistent in the terminology
    PF's IOV BAR -> the SRIOV BAR in PF
    VF's BAR -> the normal BAR in VF's view
  * rename all newly introduced function from _sriov_ to _iov_
  * rename the document to Documentation/powerpc/pci_iov_resource_on_powernv.txt
  * add the vendor id and device id of the tested devices
  * change return value from EINVAL to ENOSYS for pci_iov_virtfn_bus() and
    pci_iov_virtfn_devfn() when it is called on PF or SRIOV is not configured
  * rebase on 3.18-rc2 and tested
v8:
  * use weak funcion pcibios_sriov_resource_size() instead of some flag to
    retrieve the IOV BAR size.
  * add a document Documentation/powerpc/pci_resource.txt to explain the
    design.
  * make pci_iov_virtfn_bus()/pci_iov_virtfn_devfn() not inline.
  * extract a function res_to_dev_res(), so that it is more general to get
    additional size and alignment
  * fix one contention which is introduced in "powrepc/pci: Refactor pci_dn".
    the root cause is pci_get_slot() takes pci_bus_sem and leads to dead
    lock.
v7:
  * add IORESOURCE_ARCH flag for IOV BAR on powernv platform.
  * when IOV BAR has IORESOURCE_ARCH flag, the size is retrieved from
    hardware directly. If not, calculate as usual.
  * reorder the patch set, group them by subsystem:
    PCI, powerpc, powernv
  * rebase it on 3.16-rc6
v6:
  * remove pcibios_enable_sriov()/pcibios_disable_sriov() weak function
    similar function is moved to
    pnv_pci_enable_device_hook()/pnv_pci_disable_device_hook(). When PF is
    enabled, platform will try best to allocate resources for VFs.
  * remove pcibios_sriov_resource_size weak function
  * VF BAR size is retrieved from hardware directly in virtfn_add()
v5:
  * merge those SRIOV related platform functions in machdep_calls
    wrap them in one CONFIG_PCI_IOV marco
  * define IODA_INVALID_M64 to replace (-1)
    use this value to represent the m64_wins is not used
  * rename pnv_pci_release_dev_dma() to pnv_pci_ioda2_release_dma_pe()
    this function is a conterpart to pnv_pci_ioda2_setup_dma_pe()
  * change dev_info() to dev_dgb() in pnv_pci_ioda_fixup_iov_resources()
    reduce some log in kernel
  * release M64 window in pnv_pci_ioda2_release_dma_pe()
v4:
  * code format fix, eg. not exceed 80 chars
  * in commit "ppc/pnv: Add function to deconfig a PE"
    check the bus has a bridge before print the name
    remove a PE from its own PELTV
  * change the function name for sriov resource size/alignment
  * rebase on 3.16-rc3
  * VFs will not rely on device node
    As Grant Likely's comments, kernel should have the ability to handle the
    lack of device_node gracefully. Gavin restructure the pci_dn, which
    makes the VF will have pci_dn even when VF's device_node is not provided
    by firmware.
  * clean all the patch title to make them comply with one style
  * fix return value for pci_iov_virtfn_bus/pci_iov_virtfn_devfn
v3:
  * change the return type of virtfn_bus/virtfn_devfn to int
    change the name of these two functions to pci_iov_virtfn_bus/pci_iov_virtfn_devfn
  * reduce the second parameter or pcibios_sriov_disable()
  * use data instead of pe in "ppc/pnv: allocate pe->iommu_table dynamically"
  * rename __pci_sriov_resource_size to pcibios_sriov_resource_size
  * rename __pci_sriov_resource_alignment to pcibios_sriov_resource_alignment
v2:
  * change the return value of virtfn_bus/virtfn_devfn to 0
  * move some TCE related marco definition to
    arch/powerpc/platforms/powernv/pci.h
  * fix the __pci_sriov_resource_alignment on powernv platform
    During the sizing stage, the IOV BAR is truncated to 0, which will
    effect the order of allocation. Fix this, so that make sure BAR will be
    allocated ordered by their alignment.
v1:
  * improve the change log for
    "PCI: Add weak __pci_sriov_resource_size() interface"
    "PCI: Add weak __pci_sriov_resource_alignment() interface"
    "PCI: take additional IOV BAR alignment in sizing and assigning"
  * wrap VF PE code in CONFIG_PCI_IOV
  * did regression test on P7.
Gavin Shan (1):
 powrepc/pci: Refactor pci_dn

Wei Yang (16):
 PCI/IOV: Export interface for retrieve VF's BDF
 PCI/IOV: add VF enable/disable hook
 PCI: Add weak pcibios_iov_resource_alignment() interface
 PCI: Store VF BAR size in pci_sriov
 PCI: Take additional PF's IOV BAR alignment in sizing and assigning
 powerpc/pci: Add PCI resource alignment documentation
 powerpc/pci: Don't unset pci resources for VFs
 powerpc/pci: remove pci_dn->pcidev field
 powerpc/powernv: Use pci_dn in PCI config accessor
 powerpc/powernv: Allocate pe->iommu_table dynamically
 powerpc/powernv: Reserve additional space for IOV BAR according to
   the number of total_pe
 powerpc/powernv: Implement pcibios_iov_resource_alignment() on
   powernv
 powerpc/powernv: Shift VF resource with an offset
 powerpc/powernv: Allocate VF PE
 powerpc/powernv: Reserve additional space for IOV BAR, with
   m64_per_iov supported
 powerpc/powernv: Group VF PE when IOV BAR is big on PHB3

.../powerpc/pci_iov_resource_on_powernv.txt        |  215 ++++++
arch/powerpc/include/asm/device.h                  |    3 +
arch/powerpc/include/asm/iommu.h                   |    3 +
arch/powerpc/include/asm/machdep.h                 |    7 +
arch/powerpc/include/asm/pci-bridge.h              |   24 +-
arch/powerpc/kernel/pci-common.c                   |   23 +
arch/powerpc/kernel/pci_dn.c                       |  251 ++++++-
arch/powerpc/platforms/powernv/eeh-powernv.c       |   14 +-
arch/powerpc/platforms/powernv/pci-ioda.c          |  739 +++++++++++++++++++-
arch/powerpc/platforms/powernv/pci.c               |   87 +--
arch/powerpc/platforms/powernv/pci.h               |   13 +-
drivers/pci/iov.c                                  |   80 ++-
drivers/pci/pci.h                                  |    2 +
drivers/pci/setup-bus.c                            |   85 ++-
include/linux/pci.h                                |   17 +
15 files changed, 1449 insertions(+), 114 deletions(-)
create mode 100644 Documentation/powerpc/pci_iov_resource_on_powernv.txt

-- 
1.7.9.5

-- 
Richard Yang
Help you, Help me