[Skiboot] [PATCH v4 1/2] phb4: set PHB CMPM registers for tunneled operations

[christophe lombard]

Le 10/01/2018 à 15:47, Philippe Bergheaud a écrit :
> P9 supports PCI tunneled operations (atomics and as_notify) that require
> setting the PHB ASN Compare/Mask register with a 16-bit indication.
> 
> This register is currently initialized by enable_capi_mode(). But, as
> tunneled operations may also work in PCI mode, the ASN Compare/Mask
> register should rather be initialized in phb4_init_ioda3().
> 
> This patch also adds "ibm,phb-indications" to the device tree, to tell
> Linux the values of CAPI, ASN, and NBW indications, when supported.
> 
> 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 let Linux choose indication values.
>      Let skiboot tell Linux via the device tree.
>      Initialize the PHB ASN indication in PCI mode.
> 
> v3: No functional change.
>      Drop cosmetic fixes in comments.
> 
> v4: No change.
> ---
>   hw/phb4.c           | 28 +++++++++++++++++++++-------
>   include/phb4-regs.h |  4 ++--
>   2 files changed, 23 insertions(+), 9 deletions(-)
> 

Reviewed-by: Christophe Lombard clombard at linux.vnet.ibm.com