diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2022-04-15 03:05:31 -0700 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2022-05-01 19:51:23 -0700 |
| commit | 11e969bc964a0e50ae64cdba092048e3937d2389 (patch) | |
| tree | 99303eb470e622faf5397649005d6f221f46bdb0 /arch/xtensa/kernel/ptrace.c | |
| parent | f29cab2906346fa93831376256e01f5a6629f979 (diff) | |
xtensa: support coprocessors on SMP
Current coprocessor support on xtensa only works correctly on
uniprocessor configurations. Make it work on SMP too and keep it lazy.
Make coprocessor_owner array per-CPU and move it to struct exc_table for
easy access from the fast_coprocessor exception handler. Allow task to
have live coprocessors only on single CPU, record this CPU number in the
struct thread_info::cp_owner_cpu. Change struct thread_info::cpenable
meaning to be 'coprocessors live on cp_owner_cpu'.
Introduce C-level coprocessor exception handler that flushes and
releases live coprocessors of the task taking 'coprocessor disabled'
exception and call it from the fast_coprocessor handler when the task
has live coprocessors on other CPU.
Make coprocessor_flush_all and coprocessor_release_all work correctly
when called from any CPU by sending IPI to the cp_owner_cpu. Add
function coprocessor_flush_release_all to do flush followed by release
atomically. Add function local_coprocessors_flush_release_all to flush
and release all coprocessors on the local CPU and use it to flush
coprocessor contexts from the CPU that goes offline.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/ptrace.c')
| -rw-r--r-- | arch/xtensa/kernel/ptrace.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c index 323c678a691f..22cdaa6729d3 100644 --- a/arch/xtensa/kernel/ptrace.c +++ b/arch/xtensa/kernel/ptrace.c @@ -171,8 +171,7 @@ static int tie_set(struct task_struct *target, #if XTENSA_HAVE_COPROCESSORS /* Flush all coprocessors before we overwrite them. */ - coprocessor_flush_all(ti); - coprocessor_release_all(ti); + coprocessor_flush_release_all(ti); ti->xtregs_cp.cp0 = newregs->cp0; ti->xtregs_cp.cp1 = newregs->cp1; ti->xtregs_cp.cp2 = newregs->cp2; |