diff options
| author | Nathan Lynch <nathanl@linux.ibm.com> | 2020-12-08 00:51:37 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-08 13:40:55 +0300 |
| commit | 5f485a66f4d0693a535e4ab38ffc3538716d2c2b (patch) | |
| tree | b872e8fded6f55e34d061b7310b8fd924fc1f5e9 /arch/powerpc/kernel/rtas.c | |
| parent | 701ba68342412ae9be99a7c7f3badebf95271403 (diff) | |
| download | linux-5f485a66f4d0693a535e4ab38ffc3538716d2c2b.tar.xz | |
powerpc/rtas: add rtas_activate_firmware()
Provide a documented wrapper function for the ibm,activate-firmware
service, which must be called after a partition migration or
hibernation.
If the function is absent or the call fails, the OS will continue to
run normally with the current firmware, so there is no need to perform
any recovery. Just log it and continue.
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201207215200.1785968-6-nathanl@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/rtas.c')
| -rw-r--r-- | arch/powerpc/kernel/rtas.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 8a618a3c4beb..3a740ae933f8 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -798,6 +798,36 @@ void rtas_os_term(char *str) printk(KERN_EMERG "ibm,os-term call failed %d\n", status); } +/** + * rtas_activate_firmware() - Activate a new version of firmware. + * + * Activate a new version of partition firmware. The OS must call this + * after resuming from a partition hibernation or migration in order + * to maintain the ability to perform live firmware updates. It's not + * catastrophic for this method to be absent or to fail; just log the + * condition in that case. + * + * Context: This function may sleep. + */ +void rtas_activate_firmware(void) +{ + int token; + int fwrc; + + token = rtas_token("ibm,activate-firmware"); + if (token == RTAS_UNKNOWN_SERVICE) { + pr_notice("ibm,activate-firmware method unavailable\n"); + return; + } + + do { + fwrc = rtas_call(token, 0, 1, NULL); + } while (rtas_busy_delay(fwrc)); + + if (fwrc) + pr_err("ibm,activate-firmware failed (%i)\n", fwrc); +} + static int ibm_suspend_me_token = RTAS_UNKNOWN_SERVICE; #ifdef CONFIG_PPC_PSERIES static int __rtas_suspend_last_cpu(struct rtas_suspend_me_data *data, int wake_when_done) |