soc/intel/xeon_sp: Scan and allocate resources on all stacks

The code can now deal with stacks that have no resources so just hook
them all up.

Intel XEON-SP FSP reports all report the state of its stacks, which
comprise of PCI root bridges and their respective resources, like PCI
busses, IO and MEM resources, via HOB. Parsing all of those into native
coreboot structures makes it possible to handle those in a more native
fashion like use PCI drivers, native helper functions, ... As opposed
parsing those structures again out of the HOB each time. This makes code
reuse across the tree more feasible.

An additional advantage is that Linux does not need to redo resource
allocation since the one done by coreboot will be valid, which
potentially decreases boot time.

TEST=intel/archercity CRB

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Signed-off-by: Shuo Liu <shuo.liu@intel.com>
Change-Id: Id72c6e4499e99df3b7ca821ab2893cbcc869dbcd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78332
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

8 files changed, 27 insertions, 44 deletions

diff --git a/src/soc/intel/xeon_sp/acpi.c b/src/soc/intel/xeon_sp/acpi.c
index 61d51862f52e..5eaa76253a20 100644
--- a/src/soc/intel/xeon_sp/acpi.c
+++ b/src/soc/intel/xeon_sp/acpi.c
@@ -104,9 +104,9 @@ size_t soc_get_ioapic_info(const uintptr_t *ioapic_bases[])
 		for (int stack = 0; stack < MAX_IIO_STACK; ++stack) {
 			const STACK_RES *ri =
 				&hob->PlatformData.IIO_resource[socket].StackRes[stack];
-			if (!stack_needs_resource_alloc(ri))
-				continue;
 			uint32_t ioapic_base = ri->IoApicBase;
+			if (ioapic_base == 0 || ioapic_base == 0xFFFFFFFF)
+				continue;
 			assert(index < ARRAY_SIZE(xeonsp_ioapic_bases));
 			xeonsp_ioapic_bases[index++] = ioapic_base;
 			if (!CONFIG(XEON_SP_HAVE_IIO_IOAPIC))
diff --git a/src/soc/intel/xeon_sp/chip_common.c b/src/soc/intel/xeon_sp/chip_common.c
index 0411a0326c22..003a03f31687 100644
--- a/src/soc/intel/xeon_sp/chip_common.c
+++ b/src/soc/intel/xeon_sp/chip_common.c
@@ -110,7 +110,7 @@ void attach_iio_stacks(struct device *dev)
 				continue;
 
 			const STACK_RES *ri = &hob->PlatformData.IIO_resource[s].StackRes[x];
-			if (!stack_needs_resource_alloc(ri))
+			if (ri->BusBase > ri->BusLimit)
 				continue;
 
 			if (!is_pcie_iio_stack_res(ri)) {
diff --git a/src/soc/intel/xeon_sp/cpx/soc_util.c b/src/soc/intel/xeon_sp/cpx/soc_util.c
index e277752e5cba..7a7e295b62bc 100644
--- a/src/soc/intel/xeon_sp/cpx/soc_util.c
+++ b/src/soc/intel/xeon_sp/cpx/soc_util.c
@@ -25,14 +25,9 @@ const struct SystemMemoryMapHob *get_system_memory_map(void)
 	return *memmap_addr;
 }
 
-bool stack_needs_resource_alloc(const STACK_RES *res)
-{
-	return res->Personality == TYPE_UBOX_IIO;
-}
-
 bool is_pcie_iio_stack_res(const STACK_RES *res)
 {
-	return stack_needs_resource_alloc(res);
+	return res->Personality == TYPE_UBOX_IIO;
 }
 
 uint8_t get_stack_busno(const uint8_t stack)
@@ -116,3 +111,24 @@ void soc_set_mrc_cold_boot_flag(bool cold_boot_required)
 		cmos_write(new_mrc_status, CMOS_OFFSET_MRC_STATUS);
 	}
 }
+
+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 socket = 0, iio = 0; iio < hob->PlatformData.numofIIO; ++socket) {
+		if (!soc_cpu_is_enabled(socket))
+			continue;
+		iio++;
+		for (int x = 0; x < MAX_IIO_STACK; ++x) {
+			const STACK_RES *ri;
+			ri = &hob->PlatformData.IIO_resource[socket].StackRes[x];
+			if (!is_pcie_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));
+		}
+	}
+}
diff --git a/src/soc/intel/xeon_sp/include/soc/util.h b/src/soc/intel/xeon_sp/include/soc/util.h
index a03c8e84049d..fb9b1380b466 100644
--- a/src/soc/intel/xeon_sp/include/soc/util.h
+++ b/src/soc/intel/xeon_sp/include/soc/util.h
@@ -23,7 +23,6 @@ struct iiostack_resource {
 };
 
 void get_iiostack_info(struct iiostack_resource *info);
-bool stack_needs_resource_alloc(const STACK_RES *res);
 bool is_pcie_iio_stack_res(const STACK_RES *res);
 void bios_done_msr(void *unused);
 
diff --git a/src/soc/intel/xeon_sp/memmap.c b/src/soc/intel/xeon_sp/memmap.c
index e73143fc78f1..a9236a90a96c 100644
--- a/src/soc/intel/xeon_sp/memmap.c
+++ b/src/soc/intel/xeon_sp/memmap.c
@@ -74,7 +74,7 @@ union dpr_register txt_get_chipset_dpr(void)
 		for (int stack = 0; stack < MAX_IIO_STACK; ++stack) {
 			const STACK_RES *ri =
 				&hob->PlatformData.IIO_resource[socket].StackRes[stack];
-			if (!stack_needs_resource_alloc(ri))
+			if (ri->VtdBarAddress == 0)
 				continue;
 			uint8_t bus = ri->BusBase;
 			dev = VTD_DEV(bus);
diff --git a/src/soc/intel/xeon_sp/skx/soc_util.c b/src/soc/intel/xeon_sp/skx/soc_util.c
index d61d07489f04..a5db8fd3096e 100644
--- a/src/soc/intel/xeon_sp/skx/soc_util.c
+++ b/src/soc/intel/xeon_sp/skx/soc_util.c
@@ -54,15 +54,9 @@ const struct SystemMemoryMapHob *get_system_memory_map(void)
 	return memmap_addr;
 }
 
-bool stack_needs_resource_alloc(const STACK_RES *res)
-{
-	// TODO: do we have situation with only bux 0 and one stack?
-	return res->BusBase < res->BusLimit;
-}
-
 bool is_pcie_iio_stack_res(const STACK_RES *res)
 {
-	return stack_needs_resource_alloc(res);
+	return res->BusBase < res->BusLimit;
 }
 
 uint8_t get_stack_busno(const uint8_t stack)
diff --git a/src/soc/intel/xeon_sp/spr/soc_util.c b/src/soc/intel/xeon_sp/spr/soc_util.c
index 86fe803e85da..9c1a69141894 100644
--- a/src/soc/intel/xeon_sp/spr/soc_util.c
+++ b/src/soc/intel/xeon_sp/spr/soc_util.c
@@ -68,11 +68,6 @@ const struct SystemMemoryMapElement *get_system_memory_map_elment(uint8_t *num)
 	return hob->Element;
 }
 
-bool stack_needs_resource_alloc(const STACK_RES *res)
-{
-	return res->Personality == TYPE_UBOX_IIO || res->Personality == TYPE_DINO;
-}
-
 bool is_pcie_iio_stack_res(const STACK_RES *res)
 {
 	return res->Personality == TYPE_UBOX_IIO;
diff --git a/src/soc/intel/xeon_sp/util.c b/src/soc/intel/xeon_sp/util.c
index c9f4c5549a68..8658e01a4e34 100644
--- a/src/soc/intel/xeon_sp/util.c
+++ b/src/soc/intel/xeon_sp/util.c
@@ -101,27 +101,6 @@ 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 socket = 0, iio = 0; iio < hob->PlatformData.numofIIO; ++socket) {
-		if (!soc_cpu_is_enabled(socket))
-			continue;
-		iio++;
-		for (int x = 0; x < MAX_IIO_STACK; ++x) {
-			const STACK_RES *ri;
-			ri = &hob->PlatformData.IIO_resource[socket].StackRes[x];
-			if (!stack_needs_resource_alloc(ri))
-				continue;
-			assert(info->no_of_stacks < (CONFIG_MAX_SOCKET * MAX_IIO_STACK));
-			memcpy(&info->res[info->no_of_stacks++], ri, sizeof(STACK_RES));
-		}
-	}
-}
-
 /*
  * Returns true if the CPU in the specified socket was found
  * during QPI init, false otherwise.