Re: [edk2-devel] [PATCH 3/3] ArmPkg: Disable watchdog interaction after exiting boot services

["Sami Mujawar" <sami.mujawar@arm.com>]

Hi Rebecca,

Thank you for this patch.

I have some minor suggestions marked inline as [SAMI].

Regards,

Sami Mujawar	

On 03/01/2024, 20:44, "Rebecca Cran" <rebecca@os.amperecomputing.com <mailto:rebecca@os.amperecomputing.com>> wrote:


Update GenericWatchdogDxe to disable watchdog interaction after exiting
boot services. Also, move the mEfiExitBootServicesEvent event to the top
of the file with the other static variables.


Signed-off-by: Rebecca Cran <rebecca@os.amperecomputing.com <mailto:rebecca@os.amperecomputing.com>>
---
ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)


diff --git a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
index 8f02f38c64e3..912106eb6ad2 100644
--- a/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
+++ b/ArmPkg/Drivers/GenericWatchdogDxe/GenericWatchdogDxe.c
@@ -36,10 +36,14 @@ STATIC UINTN mTimerFrequencyHz = 0;
It is therefore stored here. 0 means the timer is not running. */
STATIC UINT64 mNumTimerTicks = 0;


+/* disables watchdog interaction after Exit Boot Services */
+STATIC BOOLEAN mExitedBootServices = FALSE;
+
#define MAX_UINT48 0xFFFFFFFFFFFFULL


STATIC EFI_HARDWARE_INTERRUPT2_PROTOCOL *mInterruptProtocol;
STATIC EFI_WATCHDOG_TIMER_NOTIFY mWatchdogNotify;
+STATIC EFI_EVENT mEfiExitBootServicesEvent;


STATIC
VOID
@@ -91,7 +95,8 @@ WatchdogExitBootServicesEvent (
)
{
WatchdogDisable ();
- mNumTimerTicks = 0;
+ mNumTimerTicks = 0;
+ mExitedBootServices = TRUE;
}


/* This function is called when the watchdog's first signal (WS0) goes high.
@@ -202,8 +207,9 @@ WatchdogSetTimerPeriod (
{
UINTN SystemCount;


- // if TimerPeriod is 0, this is a request to stop the watchdog.
- if (TimerPeriod == 0) {
+ // if TimerPeriod is 0 or we've exited boot services,
+ // this is a request to stop the watchdog.
+ if (TimerPeriod == 0 || mExitedBootServices) {
[SAMI] I think we need extra brackets here. Also, should EFI_DEVICE_ERROR be returned if ExitBootServices is signalled but TimerPeriod != 0?
 i.e. we stop the watchdog but return an error to the caller so that it knows to fix the broken code.
[/SAMI]
mNumTimerTicks = 0;
WatchdogDisable ();
return EFI_SUCCESS;
@@ -303,8 +309,6 @@ STATIC EFI_WATCHDOG_TIMER_ARCH_PROTOCOL mWatchdogTimer = {
WatchdogGetTimerPeriod
};


-STATIC EFI_EVENT mEfiExitBootServicesEvent;
-
EFI_STATUS
EFIAPI
GenericWatchdogEntry (
-- 
2.34.1







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