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author | 2023-02-10 12:42:08 -0600 | |
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committer | 2023-02-13 22:35:03 +1100 | |
commit | 08273c9f619cb32fb041935724f576e607101f3b (patch) | |
tree | 49017ed6ba9e8a9dec74342d86a4fe425d6a3303 /arch/powerpc/platforms/pseries/rtas-work-area.c | |
parent | powerpc/rtas: introduce rtas_function_token() API (diff) | |
download | linux-08273c9f619cb32fb041935724f576e607101f3b.tar.gz linux-08273c9f619cb32fb041935724f576e607101f3b.tar.bz2 linux-08273c9f619cb32fb041935724f576e607101f3b.zip |
powerpc/rtas: arch-wide function token lookup conversions
With the tokens for all implemented RTAS functions now available via
rtas_function_token(), which is optimal and safe for arbitrary
contexts, there is no need to use rtas_token() or cache its result.
Most conversions are trivial, but a few are worth describing in more
detail:
* Error injection token comparisons for lockdown purposes are
consolidated into a simple predicate: token_is_restricted_errinjct().
* A couple of special cases in block_rtas_call() do not use
rtas_token() but perform string comparisons against names in the
function table. These are converted to compare against token values
instead, which is logically equivalent but less expensive.
* The lookup for the ibm,os-term token can be deferred until needed,
instead of caching it at boot to avoid device tree traversal during
panic.
* Since rtas_function_token() accesses a read-only data structure
without taking any locks, xmon's lookup of set-indicator can be
performed as needed instead of cached at startup.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230125-b4-powerpc-rtas-queue-v3-20-26929c8cce78@linux.ibm.com
Diffstat (limited to 'arch/powerpc/platforms/pseries/rtas-work-area.c')
-rw-r--r-- | arch/powerpc/platforms/pseries/rtas-work-area.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/pseries/rtas-work-area.c b/arch/powerpc/platforms/pseries/rtas-work-area.c index 1ee63335bd4b..b37d52f40360 100644 --- a/arch/powerpc/platforms/pseries/rtas-work-area.c +++ b/arch/powerpc/platforms/pseries/rtas-work-area.c @@ -203,7 +203,7 @@ void __init rtas_work_area_reserve_arena(const phys_addr_t limit) * So set up the arena if we find that, with a fallback to * ibm,configure-connector, just in case. */ - if (rtas_service_present("ibm,get-system-parameter") || - rtas_service_present("ibm,configure-connector")) + if (rtas_function_implemented(RTAS_FN_IBM_GET_SYSTEM_PARAMETER) || + rtas_function_implemented(RTAS_FN_IBM_CONFIGURE_CONNECTOR)) rwa_state.arena = memblock_alloc_try_nid(size, align, min, limit, nid); } |