Le 02/03/2018 à 10:56, Philippe Bergheaud a écrit :
P9 supports PCI tunneled operations (atomics and as_notify). This
patch adds support for tunneled operations on powernv, with a new
API, to be called by device drivers:

    Enable tunnel operations, tell driver the 16-bit ASN indication
    used by kernel.

    Disable tunnel operations.

    Tell kernel the Tunnel BAR Response address used by driver.
    This function uses two new OPAL calls, as the PBCQ Tunnel BAR
    register is configured by skiboot.

    Return the ASN info of the thread to be woken up.

Signed-off-by: Philippe Bergheaud <fe...@linux.vnet.ibm.com>
Reviewed-by: Frederic Barrat <fbar...@linux.vnet.ibm.com>

v2: Do not set the ASN indication. Get it from the device tree.

v3: Make pnv_pci_get_phb_node() available when compiling without cxl.

v4: Add pnv_pci_get_as_notify_info().
     Rebase opal call numbers on skiboot 5.9.6.

v5: pnv_pci_get_tunnel_ind():
       - fix node reference count
       - fail if task == NULL
       - read pid from mm->context.id
       - explain that thread.tidr require CONFIG_PPC64

v6: pnv_pci_get_tunnel_ind():
       - check if radix is enabled, or else return an error
       - remove a capi-specific comment, irrelevant for pci

v7: pnv_pci_set_tunnel_bar():
       - setting the tunnel bar more than once with the same value
         is not an error

v8: No change

v9: Rename pnv_pci_get_tunnel_ind() into pnv_pci_enable_tunnel():
       - Increase real window size to accept as_notify messages.
     New api pnv_pci_disable_tunnel():
       - Restore real window size to its default value.
     Adjust opal call numbers.

v10: Adjust opal call numbers to their final values.

Reviewed-by: Christophe Lombard <clomb...@linux.vnet.ibm.com>

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