Message ID | 20210914101630.30613-1-hegdevasant@linux.vnet.ibm.com (mailing list archive) |
---|---|
State | Accepted |
Headers | show |
Series | powerpc/powernv/flash: Check OPAL flash calls exist before using | expand |
Context | Check | Description |
---|---|---|
snowpatch_ozlabs/github-powerpc_ppctests | success | Successfully ran 8 jobs. |
snowpatch_ozlabs/github-powerpc_selftests | success | Successfully ran 8 jobs. |
snowpatch_ozlabs/github-powerpc_sparse | success | Successfully ran 4 jobs. |
snowpatch_ozlabs/github-powerpc_clang | success | Successfully ran 7 jobs. |
snowpatch_ozlabs/github-powerpc_kernel_qemu | success | Successfully ran 24 jobs. |
Vasant Hegde <hegdevasant@linux.vnet.ibm.com> writes: > Currently only FSP based powernv systems supports firmware update > interfaces. Hence check that the token OPAL_FLASH_VALIDATE exists > before initalising the flash driver. > > Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> > --- > arch/powerpc/platforms/powernv/opal-flash.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/arch/powerpc/platforms/powernv/opal-flash.c b/arch/powerpc/platforms/powernv/opal-flash.c > index 7e7d38b17420..05490fc22fae 100644 > --- a/arch/powerpc/platforms/powernv/opal-flash.c > +++ b/arch/powerpc/platforms/powernv/opal-flash.c > @@ -520,6 +520,10 @@ void __init opal_flash_update_init(void) > { > int ret; > > + /* Firmware update is not supported by firmware */ > + if (!opal_check_token(OPAL_FLASH_VALIDATE)) > + return; > + That will mean the following files no longer appear on BMC systems: /sys/firmware/opal/image /sys/firmware/opal/validate_flash /sys/firmware/opal/manage_flash /sys/firmware/opal/update_flash Presumably those files don't actually work correctly, but are we sure their mere existence isn't used by anything at all? We've had trouble in the past where removing sysfs files breaks tools unexpectedly, see smt_snooze_delay. cheers
On 9/15/21 11:53 AM, Michael Ellerman wrote: > Vasant Hegde <hegdevasant@linux.vnet.ibm.com> writes: >> Currently only FSP based powernv systems supports firmware update >> interfaces. Hence check that the token OPAL_FLASH_VALIDATE exists >> before initalising the flash driver. >> >> Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> >> --- >> arch/powerpc/platforms/powernv/opal-flash.c | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/arch/powerpc/platforms/powernv/opal-flash.c b/arch/powerpc/platforms/powernv/opal-flash.c >> index 7e7d38b17420..05490fc22fae 100644 >> --- a/arch/powerpc/platforms/powernv/opal-flash.c >> +++ b/arch/powerpc/platforms/powernv/opal-flash.c >> @@ -520,6 +520,10 @@ void __init opal_flash_update_init(void) >> { >> int ret; >> >> + /* Firmware update is not supported by firmware */ >> + if (!opal_check_token(OPAL_FLASH_VALIDATE)) >> + return; >> + > Michael, > That will mean the following files no longer appear on BMC systems: > > /sys/firmware/opal/image > /sys/firmware/opal/validate_flash > /sys/firmware/opal/manage_flash > /sys/firmware/opal/update_flash > > Presumably those files don't actually work correctly, but are we sure > their mere existence isn't used by anything at all? That's correct. We never used these files/interfaces on BMC based systems. > > We've had trouble in the past where removing sysfs files breaks tools > unexpectedly, see smt_snooze_delay. AFAIK only update_flash uses these interfaces on baremetal systems. This change shouldn't break update_flash as these interfaces never used/worked on BMC based powernv systems. -Vasant
On 9/15/21 11:53 AM, Michael Ellerman wrote: > Vasant Hegde <hegdevasant@linux.vnet.ibm.com> writes: >> Currently only FSP based powernv systems supports firmware update >> interfaces. Hence check that the token OPAL_FLASH_VALIDATE exists >> before initalising the flash driver. >> >> Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> >> --- >> arch/powerpc/platforms/powernv/opal-flash.c | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/arch/powerpc/platforms/powernv/opal-flash.c b/arch/powerpc/platforms/powernv/opal-flash.c >> index 7e7d38b17420..05490fc22fae 100644 >> --- a/arch/powerpc/platforms/powernv/opal-flash.c >> +++ b/arch/powerpc/platforms/powernv/opal-flash.c >> @@ -520,6 +520,10 @@ void __init opal_flash_update_init(void) >> { >> int ret; >> >> + /* Firmware update is not supported by firmware */ >> + if (!opal_check_token(OPAL_FLASH_VALIDATE)) >> + return; >> + > Michael, > That will mean the following files no longer appear on BMC systems: > > /sys/firmware/opal/image > /sys/firmware/opal/validate_flash > /sys/firmware/opal/manage_flash > /sys/firmware/opal/update_flash > > Presumably those files don't actually work correctly, but are we sure > their mere existence isn't used by anything at all? That's correct. We never used these files/interfaces on BMC based systems. > > We've had trouble in the past where removing sysfs files breaks tools > unexpectedly, see smt_snooze_delay. AFAIK only update_flash uses these interfaces on baremetal systems. This change shouldn't break update_flash as these interfaces never used/worked on BMC based powernv systems. -Vasant
On Tue, 14 Sep 2021 15:46:30 +0530, Vasant Hegde wrote: > Currently only FSP based powernv systems supports firmware update > interfaces. Hence check that the token OPAL_FLASH_VALIDATE exists > before initalising the flash driver. > > Applied to powerpc/next. [1/1] powerpc/powernv/flash: Check OPAL flash calls exist before using https://git.kernel.org/powerpc/c/25e69962efdbbbd8bf52e6b4d7852c49717923a2 cheers
diff --git a/arch/powerpc/platforms/powernv/opal-flash.c b/arch/powerpc/platforms/powernv/opal-flash.c index 7e7d38b17420..05490fc22fae 100644 --- a/arch/powerpc/platforms/powernv/opal-flash.c +++ b/arch/powerpc/platforms/powernv/opal-flash.c @@ -520,6 +520,10 @@ void __init opal_flash_update_init(void) { int ret; + /* Firmware update is not supported by firmware */ + if (!opal_check_token(OPAL_FLASH_VALIDATE)) + return; + /* Allocate validate image buffer */ validate_flash_data.buf = kzalloc(VALIDATE_BUF_SIZE, GFP_KERNEL); if (!validate_flash_data.buf) {
Currently only FSP based powernv systems supports firmware update interfaces. Hence check that the token OPAL_FLASH_VALIDATE exists before initalising the flash driver. Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> --- arch/powerpc/platforms/powernv/opal-flash.c | 4 ++++ 1 file changed, 4 insertions(+)