[S] Change in coreboot[master]: soc/intel/xeon_sp: Introduce soc_cpu_is_enabled

[Patrick Rudolph (Code Review)]

Attention is currently required from: Arthur Heymans, Christian Walter, Johnny Lin, Tim Chu.

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/76556?usp=email )

Change subject: soc/intel/xeon_sp: Introduce soc_cpu_is_enabled
......................................................................

soc/intel/xeon_sp: Introduce soc_cpu_is_enabled

Add a function to check if the CPU placed the specified socket was
found usable during QPI init. This is useful for multi-socket
platforms were a CPU is missing or has been disabled due to an error.

Change-Id: I135968fcc905928b9bc6511e3ddbd7d12bad0096
Signed-off-by: Patrick Rudolph 
---
M src/soc/intel/xeon_sp/include/soc/util.h
M src/soc/intel/xeon_sp/spr/soc_acpi.c
M src/soc/intel/xeon_sp/util.c
3 files changed, 14 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/56/76556/1

diff --git a/src/soc/intel/xeon_sp/include/soc/util.h b/src/soc/intel/xeon_sp/include/soc/util.h
index a828ffc..8e80c64 100644
--- a/src/soc/intel/xeon_sp/include/soc/util.h
+++ b/src/soc/intel/xeon_sp/include/soc/util.h
@@ -13,6 +13,7 @@
 int get_platform_thread_count(void);
 const IIO_UDS *get_iio_uds(void);
 unsigned int soc_get_num_cpus(void);
+bool soc_cpu_is_enabled(const size_t idx);
 void set_bios_init_completion(void);
 uint8_t soc_get_iio_ioapicid(int socket, int stack);

diff --git a/src/soc/intel/xeon_sp/spr/soc_acpi.c b/src/soc/intel/xeon_sp/spr/soc_acpi.c
index 5340b7b..2e77de2 100644
--- a/src/soc/intel/xeon_sp/spr/soc_acpi.c
+++ b/src/soc/intel/xeon_sp/spr/soc_acpi.c
@@ -394,7 +394,7 @@
    		const STACK_RES *ri =
    			&hob->PlatformData.IIO_resource[socket].StackRes[stack];

-			stack_enabled = hob->PlatformData.IIO_resource[socket].Valid &&
+			stack_enabled = soc_cpu_is_enabled(socket) &&
    				ri->Personality < TYPE_RESERVED;

printk(BIOS_DEBUG, "%s processing socket: %d, stack: %d, type: %d\n",
diff --git a/src/soc/intel/xeon_sp/util.c b/src/soc/intel/xeon_sp/util.c
index e0bf9bc..f17be63 100644
--- a/src/soc/intel/xeon_sp/util.c
+++ b/src/soc/intel/xeon_sp/util.c
@@ -118,6 +118,18 @@
    }
 }

+/*
+ * Returns true if the cpu in the specified socket was found
+ * during QPI init.
+ */
+bool soc_cpu_is_enabled(const size_t idx)
+{
+	const IIO_UDS *hob = get_iio_uds();
+	assert (idx < CONFIG_MAX_SOCKET);
+
+	return hob->PlatformData.IIO_resource[idx].Valid;
+}
+
 unsigned int soc_get_num_cpus(void)
 {
    /* The FSP IIO UDS HOB has field numCpus, it is actually socket count */