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| author | Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> | 2017-11-08 05:23:50 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-11-12 01:03:08 +0300 |
| commit | d4ef61b5e8955fb913e2e1a6c1533414859a839d (patch) | |
| tree | cb59a3afc81535a1f7c255f986fc02a72d1d753c /arch/powerpc/include/asm/vas.h | |
| parent | ca03258b6b338b392c778bed9c7dd56e6a513012 (diff) | |
| download | linux-d4ef61b5e8955fb913e2e1a6c1533414859a839d.tar.xz | |
powerpc/vas, nx-842: Define and use chip_to_vas_id()
Define a helper, chip_to_vas_id() to map a given chip id to corresponding
vas id.
Normally, callers of vas_rx_win_open() and vas_tx_win_open() want the VAS
window to be on the same chip where the calling thread is executing. These
callers can pass in -1 for the VAS id.
This interface will be useful if a thread running on one chip wants to open
a window on another chip (like the NX-842 driver does during start up).
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/vas.h')
| -rw-r--r-- | arch/powerpc/include/asm/vas.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/vas.h b/arch/powerpc/include/asm/vas.h index fd5963acd658..044748f547f5 100644 --- a/arch/powerpc/include/asm/vas.h +++ b/arch/powerpc/include/asm/vas.h @@ -104,6 +104,15 @@ struct vas_tx_win_attr { }; /* + * Helper to map a chip id to VAS id. + * For POWER9, this is a 1:1 mapping. In the future this maybe a 1:N + * mapping in which case, we will need to update this helper. + * + * Return the VAS id or -1 if no matching vasid is found. + */ +int chip_to_vas_id(int chipid); + +/* * Helper to initialize receive window attributes to defaults for an * NX window. */ |