soc/intel/xeon_sp: Skip empty sockets
The current Sapphire Rapids code assumes that all sockets have working
CPUs. On multi-socket platforms a CPU might be missing or was disabled
due to an error. The variable PlatformData.numofIIO and the variable
SystemStatus.numCpus reflect the working CPUs, but not the actual
socket count.
Update the code to iterate over sockets until PlatformData.numofIIO
IIOs have been found. This is required as FSP doesn't sort IIOs by
working/non working status.
This resolves invalid ACPI table generation and it fixes a crash
as commands were sent to a disabled CPU.
TEST: Disabled Socket1 on IBM/SBP1.
Change-Id: I237b6392764bbdb3b96013f577a10a4394ba9c6e
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76559
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/intel/xeon_sp/skx/soc_acpi.c b/src/soc/intel/xeon_sp/skx/soc_acpi.c
index 33e7c1a..d572d4b 100644
--- a/src/soc/intel/xeon_sp/skx/soc_acpi.c
+++ b/src/soc/intel/xeon_sp/skx/soc_acpi.c
@@ -76,7 +76,10 @@
return;
acpigen_write_scope("\\_SB");
- for (int socket = 0; socket < hob->PlatformData.numofIIO; ++socket) {
+ for (int socket = 0, iio = 0; iio < hob->PlatformData.numofIIO; ++socket) {
+ if (!soc_cpu_is_enabled(socket))
+ continue;
+ iio++;
IIO_RESOURCE_INSTANCE iio_resource =
hob->PlatformData.IIO_resource[socket];
for (int stack = 0; stack <= PSTACK2; ++stack) {