• Konrad Rzeszutek Wilk's avatar
    xen/pcifront: Use Xen-SWIOTLB when initting if required. · 3d925320
    Konrad Rzeszutek Wilk authored
    We piggyback on "xen/swiotlb: Use the swiotlb_late_init_with_tbl to init
    Xen-SWIOTLB late when PV PCI is used." functionality to start up
    the Xen-SWIOTLB if we are hot-plugged. This allows us to bypass
    the need to supply 'iommu=soft' on the Linux command line (mostly).
    With this patch, if a user forgot 'iommu=soft' on the command line,
    and hotplug a PCI device they will get:
    
    pcifront pci-0: Installing PCI frontend
    Warning: only able to allocate 4 MB for software IO TLB
    software IO TLB [mem 0x2a000000-0x2a3fffff] (4MB) mapped at [ffff88002a000000-ffff88002a3fffff]
    pcifront pci-0: Creating PCI Frontend Bus 0000:00
    pcifront pci-0: PCI host bridge to bus 0000:00
    pci_bus 0000:00: root bus resource [io  0x0000-0xffff]
    pci_bus 0000:00: root bus resource [mem 0x00000000-0xfffffffff]
    pci 0000:00:00.0: [8086:10d3] type 00 class 0x020000
    pci 0000:00:00.0: reg 10: [mem 0xfe5c0000-0xfe5dffff]
    pci 0000:00:00.0: reg 14: [mem 0xfe500000-0xfe57ffff]
    pci 0000:00:00.0: reg 18: [io  0xe000-0xe01f]
    pci 0000:00:00.0: reg 1c: [mem 0xfe5e0000-0xfe5e3fff]
    pcifront pci-0: claiming resource 0000:00:00.0/0
    pcifront pci-0: claiming resource 0000:00:00.0/1
    pcifront pci-0: claiming resource 0000:00:00.0/2
    pcifront pci-0: claiming resource 0000:00:00.0/3
    e1000e: Intel(R) PRO/1000 Network Driver - 2.0.0-k
    e1000e: Copyright(c) 1999 - 2012 Intel Corporation.
    e1000e 0000:00:00.0: Disabling ASPM L0s L1
    e1000e 0000:00:00.0: enabling device (0000 -> 0002)
    e1000e 0000:00:00.0: Xen PCI mapped GSI16 to IRQ34
    e1000e 0000:00:00.0: (unregistered net_device): Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
    e1000e 0000:00:00.0: eth0: (PCI Express:2.5GT/s:Width x1) 00:1b:21:ab:c6:13
    e1000e 0000:00:00.0: eth0: Intel(R) PRO/1000 Network Connection
    e1000e 0000:00:00.0: eth0: MAC: 3, PHY: 8, PBA No: E46981-005
    
    The "Warning only" will go away if one supplies 'iommu=soft' instead
    as we have a higher chance of being able to allocate large swaths of
    memory.
    Acked-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
    Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    3d925320
xen-pcifront.c 26.8 KB