Re: [PATCH v6 1/2] powerpc/powernv: Enable tunneled operations

[christophe lombard <clombard@linux.vnet.ibm.com>]

Le 11/01/2018 à 16:01, 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_get_tunnel_ind()
>     Tell driver the 16-bit ASN indication used by kernel.
> 
> 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@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
> 
> This patch depends on the following skiboot patches:
>    https://patchwork.ozlabs.org/patch/858324/
>    https://patchwork.ozlabs.org/patch/858325/
> ---
>   arch/powerpc/include/asm/opal-api.h            |   4 +-
>   arch/powerpc/include/asm/opal.h                |   2 +
>   arch/powerpc/include/asm/pnv-pci.h             |   5 ++
>   arch/powerpc/platforms/powernv/opal-wrappers.S |   2 +
>   arch/powerpc/platforms/powernv/pci-cxl.c       |   8 --
>   arch/powerpc/platforms/powernv/pci.c           | 106 +++++++++++++++++++++++++
>   6 files changed, 118 insertions(+), 9 deletions(-)
> 

Acked-by: Christophe Lombard <clombard@linux.vnet.ibm.com>