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| author | Michael Ellerman <mpe@ellerman.id.au> | 2017-10-12 12:17:18 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-10-21 00:33:05 +0200 |
| commit | 54820530c5faa9fd78e1c08cb6449100b1a19157 (patch) | |
| tree | b7b605fd74c9435143d6c3464d4c829e95ea8141 /arch/powerpc/kernel/process.c | |
| parent | powerpc: Add PPC_FEATURE2_HTM_NO_SUSPEND (diff) | |
| download | linux-54820530c5faa9fd78e1c08cb6449100b1a19157.tar.xz linux-54820530c5faa9fd78e1c08cb6449100b1a19157.zip | |
powerpc/powernv: Enable TM without suspend if possible
Some Power9 revisions can run in a mode where TM operates without
suspended state. If we find ourself on a CPU that might be in this
mode, we query OPAL to check, and if so we reenable TM in CPU
features, and enable a new user feature to signal to userspace that we
are in this mode.
We do not enable the "normal" user feature, PPC_FEATURE2_HTM, but we
do enable PPC_FEATURE2_HTM_NOSC because that indicates to userspace
that the kernel will abort transactions on syscall entry, which is
true regardless of the suspend mode.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 166145b18728..b02807ea54dc 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -77,6 +77,13 @@ extern unsigned long _get_SP(void); #ifdef CONFIG_PPC_TRANSACTIONAL_MEM +/* + * Are we running in "Suspend disabled" mode? If so we have to block any + * sigreturn that would get us into suspended state, and we also warn in some + * other paths that we should never reach with suspend disabled. + */ +bool tm_suspend_disabled __ro_after_init = false; + static void check_if_tm_restore_required(struct task_struct *tsk) { /* |