soc/intel/xeon_sp: move get_iiostack_info() to a common place

All this function does is looping over IIO stacks in the FSP HOB. The
only 'SOC/FSP specific' thing is the way to detect if the stack is an
IIO stack so add a callback to determine this.

Change-Id: I4fa9c54d50279213a4174186a23c3cc156e21c9a
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47522
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marc Jones <marc@marcjonesconsulting.com>

src/soc/intel/xeon_sp/cpx/include/soc/soc_util.h

@@ -6,13 +6,6 @@
 #include <hob_iiouds.h>
 #include <hob_memmap.h>
 
-struct iiostack_resource {
-	uint8_t     no_of_stacks;
-	STACK_RES   res[MAX_SOCKET * MAX_LOGIC_IIO_STACK];
-};
-
-void get_iiostack_info(struct iiostack_resource *info);
-
 const struct SystemMemoryMapHob *get_system_memory_map(void);
 
 uint32_t get_socket_stack_busno(uint32_t socket, uint32_t stack);

src/soc/intel/xeon_sp/cpx/soc_acpi.c

@@ -16,6 +16,7 @@
 #include <soc/pci_devs.h>
 #include <soc/pm.h>
 #include <soc/soc_util.h>
+#include <soc/util.h>
 
 /* TODO: Check if the common/acpi weak function can be used */
 unsigned long acpi_fill_mcfg(unsigned long current)

src/soc/intel/xeon_sp/cpx/soc_util.c

@@ -27,21 +27,9 @@ const struct SystemMemoryMapHob *get_system_memory_map(void)
 	return *memmap_addr;
 }
 
-void get_iiostack_info(struct iiostack_resource *info)
+bool is_iio_stack_res(const STACK_RES *res)
 {
-	const IIO_UDS *hob = get_iio_uds();
-
-	// copy IIO Stack info from FSP HOB
-	info->no_of_stacks = 0;
-	for (int s = 0; s < hob->PlatformData.numofIIO; ++s) {
-		for (int x = 0; x < MAX_IIO_STACK; ++x) {
-			const STACK_RES *ri = &hob->PlatformData.IIO_resource[s].StackRes[x];
-			if (ri->Personality == TYPE_UBOX_IIO) {
-				assert(info->no_of_stacks < ARRAY_SIZE(info->res));
-				memcpy(&info->res[info->no_of_stacks++], ri, sizeof(STACK_RES));
-			}
-		}
-	}
+	return res->Personality == TYPE_UBOX_IIO;
 }
 
 uint32_t get_socket_stack_busno(uint32_t socket, uint32_t stack)

src/soc/intel/xeon_sp/include/soc/util.h

@@ -17,4 +17,12 @@ unsigned int soc_get_num_cpus(void);
 void xeonsp_init_cpu_config(void);
 void set_bios_init_completion(void);
 
+struct iiostack_resource {
+	uint8_t     no_of_stacks;
+	STACK_RES   res[CONFIG_MAX_SOCKET * MAX_IIO_STACK];
+};
+
+void get_iiostack_info(struct iiostack_resource *info);
+bool is_iio_stack_res(const STACK_RES *res);
+
 #endif

src/soc/intel/xeon_sp/skx/include/soc/soc_util.h

@@ -6,13 +6,6 @@
 #include <hob_iiouds.h>
 #include <hob_memmap.h>
 
-struct iiostack_resource {
-	uint8_t     no_of_stacks;
-	STACK_RES   res[CONFIG_MAX_SOCKET * MAX_IIO_STACK];
-};
-
-void get_iiostack_info(struct iiostack_resource *info);
-
 void config_reset_cpl3_csrs(void);
 
 const struct SystemMemoryMapHob *get_system_memory_map(void);

src/soc/intel/xeon_sp/skx/soc_util.c

@@ -55,22 +55,10 @@ const struct SystemMemoryMapHob *get_system_memory_map(void)
 	return memmap_addr;
 }
 
-void get_iiostack_info(struct iiostack_resource *info)
+bool is_iio_stack_res(const STACK_RES *res)
 {
-	const IIO_UDS *hob = get_iio_uds();
-
-	// copy IIO Stack info from FSP HOB
-	info->no_of_stacks = 0;
-	for (int s = 0; s < hob->PlatformData.numofIIO; ++s) {
-		for (int x = 0; x < MAX_IIO_STACK; ++x) {
-			const STACK_RES *ri = &hob->PlatformData.IIO_resource[s].StackRes[x];
-			// TODO: do we have situation with only bux 0 and one stack?
-			if (ri->BusBase >= ri->BusLimit)
-				continue;
-			assert(info->no_of_stacks < (CONFIG_MAX_SOCKET * MAX_IIO_STACK));
-			memcpy(&info->res[info->no_of_stacks++], ri, sizeof(STACK_RES));
-		}
-	}
+	// TODO: do we have situation with only bux 0 and one stack?
+	return res->BusBase < res->BusLimit;
 }
 
 uint32_t get_socket_stack_busno(uint32_t socket, uint32_t stack)

src/soc/intel/xeon_sp/util.c

@@ -119,6 +119,23 @@ const IIO_UDS *get_iio_uds(void)
 	return hob;
 }
 
+void get_iiostack_info(struct iiostack_resource *info)
+{
+	const IIO_UDS *hob = get_iio_uds();
+
+	// copy IIO Stack info from FSP HOB
+	info->no_of_stacks = 0;
+	for (int s = 0; s < hob->PlatformData.numofIIO; ++s) {
+		for (int x = 0; x < MAX_IIO_STACK; ++x) {
+			const STACK_RES *ri = &hob->PlatformData.IIO_resource[s].StackRes[x];
+			if (!is_iio_stack_res(ri))
+				continue;
+			assert(info->no_of_stacks < (CONFIG_MAX_SOCKET * MAX_IIO_STACK));
+			memcpy(&info->res[info->no_of_stacks++], ri, sizeof(STACK_RES));
+		}
+	}
+}
+
 unsigned int soc_get_num_cpus(void)
 {
 	/* The FSP IIO UDS HOB has field numCpus, it is actually socket count */