1. 05 Jul, 2016 16 commits
  2. 29 Jun, 2016 3 commits
  3. 28 Jun, 2016 4 commits
  4. 24 Jun, 2016 7 commits
  5. 23 Jun, 2016 1 commit
  6. 21 Jun, 2016 9 commits
    • Gavin Shan's avatar
      powerpc/powernv: Print correct PHB type names · 9497a1c1
      Gavin Shan authored
      We're initializing "IODA1" and "IODA2" PHBs though they are IODA2
      and NPU PHBs as below kernel log indicates.
      
         Initializing IODA1 OPAL PHB /pciex@3fffe40700000
         Initializing IODA2 OPAL PHB /pciex@3fff000400000
      
      This fixes the PHB names. After it's applied, we get:
      
         Initializing IODA2 PHB (/pciex@3fffe40700000)
         Initializing NPU PHB (/pciex@3fff000400000)
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      9497a1c1
    • Gavin Shan's avatar
      PCI/hotplug: PowerPC PowerNV PCI hotplug driver · 66725152
      Gavin Shan authored
      This adds standalone driver to support PCI hotplug for PowerPC PowerNV
      platform that runs on top of skiboot firmware. The firmware identifies
      hotpluggable slots and marked their device tree node with proper
      "ibm,slot-pluggable" and "ibm,reset-by-firmware". The driver scans
      device tree nodes to create/register PCI hotplug slot accordingly.
      
      The PCI slots are organized in fashion of tree, which means one
      PCI slot might have parent PCI slot and parent PCI slot possibly
      contains multiple child PCI slots. At the plugging time, the parent
      PCI slot is populated before its children. The child PCI slots are
      removed before their parent PCI slot can be removed from the system.
      
      If the skiboot firmware doesn't support slot status retrieval, the PCI
      slot device node shouldn't have property "ibm,reset-by-firmware". In
      that case, none of valid PCI slots will be detected from device tree.
      The skiboot firmware doesn't export the capability to access attention
      LEDs yet and it's something for TBD.
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      66725152
    • Gavin Shan's avatar
      powerpc/powernv: Functions to get/set PCI slot state · ea0d856c
      Gavin Shan authored
      This exports 4 functions, which base on the corresponding OPAL
      APIs to get/set PCI slot status. Those functions are going to
      be used by PowerNV PCI hotplug driver:
      
         pnv_pci_get_device_tree()    opal_get_device_tree()
         pnv_pci_get_presence_state() opal_pci_get_presence_state()
         pnv_pci_get_power_state()    opal_pci_get_power_state()
         pnv_pci_set_power_state()    opal_pci_set_power_state()
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Reviewed-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      ea0d856c
    • Gavin Shan's avatar
      powerpc/powernv: Introduce pnv_pci_get_slot_id() · 7e19bf32
      Gavin Shan authored
      This introduces pnv_pci_get_slot_id() to get the hotpluggable PCI
      slot ID from the corresponding device node. It will be used by
      hotplug driver.
      Requested-by: default avatarAndrew Donnellan <andrew.donnellan@au1.ibm.com>
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      7e19bf32
    • Gavin Shan's avatar
      powerpc/powernv: Use PCI slot reset infrastructure · 9c0e1ecb
      Gavin Shan authored
      The (OPAL) firmware might provide the PCI slot reset capability
      which is identified by property "ibm,reset-by-firmware" on the
      PCI slot associated device node.
      
      This routes the reset request to firmware if "ibm,reset-by-firmware"
      exists in the PCI slot device node. Otherwise, the reset is done
      inside kernel as before.
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      9c0e1ecb
    • Gavin Shan's avatar
      powerpc/powernv: Support PCI slot ID · ebe22531
      Gavin Shan authored
      The reset and poll functionality from (OPAL) firmware supports
      PHB and PCI slot at same time. They are identified by ID. This
      supports PCI slot ID by:
      
         * Rename the argument name for opal_pci_reset() and opal_pci_poll()
           accordingly
         * Rename pnv_eeh_phb_poll() to pnv_eeh_poll() and adjust its argument
           name.
         * One macro is added to produce PCI slot ID.
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      ebe22531
    • Gavin Shan's avatar
      powerpc/pci: Delay populating pdn · 8cc7581c
      Gavin Shan authored
      The pdn (struct pci_dn) instances are allocated from memblock or
      bootmem when creating PCI controller (hoses) in setup_arch(). PCI
      hotplug, which will be supported by proceeding patches, releases
      PCI device nodes and their corresponding pdn on unplugging event.
      The memory chunks for pdn instances allocated from memblock or
      bootmem are hard to reused after being released.
      
      This delays creating pdn by pci_devs_phb_init() from setup_arch()
      to core_initcall() so that they are allocated from slab. The memory
      consumed by pdn can be released to system without problem during
      PCI unplugging time. It indicates that pci_dn is unavailable in
      setup_arch() and the the fixup on pdn (like AGP's) can't be carried
      out that time. We have to do that in pcibios_root_bridge_prepare()
      on maple/pasemi/powermac platforms where/when the pdn is available.
      pcibios_root_bridge_prepare is called from subsys_initcall() which
      is executed after core_initcall() so the code flow does not change.
      
      At the mean while, the EEH device is created when pdn is populated,
      meaning pdn and EEH device have same life cycle. In turn, we needn't
      call eeh_dev_init() to create EEH device explicitly.
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Reviewed-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      8cc7581c
    • Gavin Shan's avatar
      powerpc/pci: Update bridge windows on PCI plug · 7415c14c
      Gavin Shan authored
      On the PCI plugging event, PCI slot's subordinate devices are
      scanned and their (IO and MMIO) resources are assigned. Platform
      dependent resources (PE#, IO/MMIO/DMA windows) are allocated or
      created on updating windows of the slot's upstream bridge.
      
      This updates the windows of the hot plugged slot's upstream bridge
      in pcibios_finish_adding_to_bus() so that the platform resources
      (PE#, IO/MMIO/DMA segments) are allocated or created accordingly.
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Reviewed-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      7415c14c
    • Gavin Shan's avatar
      powerpc/powernv: Dynamically release PE · c5f7700b
      Gavin Shan authored
      This supports releasing PEs dynamically. A reference count is
      introduced to PE representing number of PCI devices associated
      with the PE. The reference count is increased when PCI device
      joins the PE and decreased when PCI device leaves the PE in
      pnv_pci_release_device(). When the count becomes zero, the PE
      and its consumed resources are released. Note that the count
      is accessed concurrently. So a counter with "int" type is enough
      here.
      
      In order to release the sources consumed by the PE, couple of
      helper functions are introduced as below:
      
         * pnv_pci_ioda1_unset_window() - Unset IODA1 DMA32 window
         * pnv_pci_ioda1_release_dma_pe() - Release IODA1 DMA32 segments
         * pnv_pci_ioda2_release_dma_pe() - Release IODA2 DMA resource
         * pnv_ioda_release_pe_seg() - Unmap IO/M32/M64 segments
      Signed-off-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      c5f7700b