[coreboot-gerrit] Change in coreboot[master]: soc/intel/apollolake/acpi.c: Add RMRRs after all DRHDs

[Angel Pons (Code Review)]

Angel Pons has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/44110 )

Change subject: soc/intel/apollolake/acpi.c: Add RMRRs after all DRHDs
......................................................................

soc/intel/apollolake/acpi.c: Add RMRRs after all DRHDs

The VT-d architecture specification (Doc. D51397-011, Rev. 3.1) says:

BIOS implementations must report these remapping structure types in
 numerical order. i.e., All remapping structures of type 0 (DRHD)
 enumerated before remapping structures of type 1 (RMRR), and so forth.

So, update the corresponding code to adhere to the specification.

Change-Id: I4ee3ae6c45e2a2c921fbccbb62b853e4a141a58d
Signed-off-by: Angel Pons 
---
M src/soc/intel/apollolake/acpi.c
1 file changed, 13 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/10/44110/1

diff --git a/src/soc/intel/apollolake/acpi.c b/src/soc/intel/apollolake/acpi.c
index 96a142a..ee1a543 100644
--- a/src/soc/intel/apollolake/acpi.c
+++ b/src/soc/intel/apollolake/acpi.c
@@ -171,19 +171,15 @@
    unsigned long tmp;

/* IGD has to be enabled, GFXVTBAR set and enabled. */
-	if (is_dev_enabled(igfx_dev) && gfxvtbar && gfxvten) {
+	const bool emit_igd = is_dev_enabled(igfx_dev) && gfxvtbar && gfxvten;
+
+	/* First, add DRHD entries */
+	if (emit_igd) {
    	tmp = current;

current += acpi_create_dmar_drhd(current, 0, 0, gfxvtbar);
    	current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
    	acpi_dmar_drhd_fixup(tmp, current);
-
-		/* Add RMRR entry */
-		tmp = current;
-		current += acpi_create_dmar_rmrr(current, 0,
-				sa_get_gsm_base(), sa_get_tolud_base() - 1);
-		current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
-		acpi_dmar_rmrr_fixup(tmp, current);
    }

/* DEFVTBAR has to be set and enabled. */
@@ -210,6 +206,15 @@
    	acpi_dmar_drhd_fixup(tmp, current);
    }

+	/* Then, add RMRR entries after all DRHD entries */
+	if (emit_igd) {
+		tmp = current;
+		current += acpi_create_dmar_rmrr(current, 0,
+				sa_get_gsm_base(), sa_get_tolud_base() - 1);
+		current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
+		acpi_dmar_rmrr_fixup(tmp, current);
+	}
+
    return current;
 }