1. 14 Jul, 2016 15 commits
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  3. 11 Jul, 2016 3 commits
  4. 08 Jul, 2016 15 commits
  5. 07 Jul, 2016 1 commit
    • Guilherme G. Piccoli's avatar
      powerpc/pci: Assign fixed PHB number based on device-tree properties · 63a72284
      Guilherme G. Piccoli authored
      The domain/PHB field of PCI addresses has its value obtained from a
      global variable, incremented each time a new domain (represented by
      struct pci_controller) is added on the system. The domain addition
      process happens during boot or due to PHB hotplug add.
      
      As recent kernels are using predictable naming for network interfaces,
      the network stack is more tied to PCI naming. This can be a problem in
      hotplug scenarios, because PCI addresses will change if devices are
      removed and then re-added. This situation seems unusual, but it can
      happen if a user wants to replace a NIC without rebooting the machine,
      for example.
      
      This patch changes the way PCI domain values are generated: now, we use
      device-tree properties to assign fixed PHB numbers to PCI addresses
      when available (meaning pSeries and PowerNV cases). We also use a bitmap
      to allow dynamic PHB numbering when device-tree properties are not
      used. This bitmap keeps track of used PHB numbers and if a PHB is
      released (by hotplug operations for example), it allows the reuse of
      this PHB number, avoiding PCI address to change in case of device remove
      and re-add soon after. No functional changes were introduced.
      Signed-off-by: default avatarGuilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
      Reviewed-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Reviewed-by: default avatarIan Munsie <imunsie@au1.ibm.com>
      Acked-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      [mpe: Drop unnecessary machine_is(pseries) test]
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      63a72284