[PATCH v10 1/2] powerpc/powernv: Enable tunneled operations

[christophe lombard]

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:
> 
> pnv_pci_enable_tunnel()
>     Enable tunnel operations, tell driver the 16-bit ASN indication
>     used by kernel.
> 
> pnv_pci_disable_tunnel()
>     Disable tunnel operations.
> 
> pnv_pci_set_tunnel_bar()
>     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.
> 
> pnv_pci_get_as_notify_info()
>     Return the ASN info of the thread to be woken up.
> 
> Signed-off-by: Philippe Bergheaud <felix at linux.vnet.ibm.com>
> Reviewed-by: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
> ---
> Changelog:
> 
> 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
>      pnv_pci_get_as_notify_info():
>        - 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
>      pnv_pci_get_as_notify_info():
>        - 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 <clombard at linux.vnet.ibm.com>