On 16/12/2023 14.42, Nicholas Piggin wrote:
In preparation for improved SMP support, add stop-self support to the
harness. This is non-trivial because it requires an unlocked rtas
call: a CPU can't be holding a spin lock when it goes offline or it
will deadlock other CPUs. rtas permits stop-self to be called without
serialising all other rtas operations.
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
lib/powerpc/asm/rtas.h | 2 ++
lib/powerpc/rtas.c | 78 +++++++++++++++++++++++++++++++++---------
2 files changed, 64 insertions(+), 16 deletions(-)
...
+void rtas_stop_self(void)
+{
+ struct rtas_args args;
+ uint32_t token;
+ int ret;
+
+ ret = rtas_token("stop-self", &token);
+ if (ret) {
+ puts("RTAS stop-self not available\n");
+ return;
+ }
+
+ ret = rtas_call_unlocked(&args, token, 0, 1, NULL);
+ printf("RTAS stop-self returnd %d\n", ret);
s/returnd/returned/
+}
With the typo fixed:
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
