nb/intel/haswell: Generate ACPI DMAR table

If the SoC is VT-d capable, write an ACPI DMAR table. The entry for the
GFXVTBAR is only generated if the IGD is enabled.

Change-Id: Ib354337d47b27d18c3b79b5de3b4fa100b59c8fc
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/24984
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Youness Alaoui <snifikino@gmail.com>

3 files changed, 66 insertions, 0 deletions

diff --git a/src/northbridge/intel/haswell/acpi.c b/src/northbridge/intel/haswell/acpi.c
index e032948e527b..9d76ba8ce240 100644
--- a/src/northbridge/intel/haswell/acpi.c
+++ b/src/northbridge/intel/haswell/acpi.c
@@ -22,6 +22,7 @@
 #include <device/pci.h>
 #include <device/pci_ids.h>
 #include "haswell.h"
+#include <southbridge/intel/lynxpoint/pch.h>
 
 unsigned long acpi_fill_mcfg(unsigned long current)
 {
@@ -69,3 +70,59 @@ unsigned long acpi_fill_mcfg(unsigned long current)
 
 	return current;
 }
+
+static unsigned long acpi_fill_dmar(unsigned long current)
+{
+	struct device *const igfx_dev = dev_find_slot(0, PCI_DEVFN(2, 0));
+	const u32 gfxvtbar = MCHBAR32(GFXVTBAR) & ~0xfff;
+	const u32 vtvc0bar = MCHBAR32(VTVC0BAR) & ~0xfff;
+	const bool gfxvten = MCHBAR32(GFXVTBAR) & 0x1;
+	const bool vtvc0en = MCHBAR32(VTVC0BAR) & 0x1;
+
+	/* iGFX has to be enabled; GFXVTBAR set, enabled, in 32-bit space */
+	if (igfx_dev && igfx_dev->enabled && gfxvtbar
+			&& gfxvten && !MCHBAR32(GFXVTBAR + 4)) {
+		const unsigned long tmp = current;
+
+		current += acpi_create_dmar_drhd(current, 0, 0, gfxvtbar);
+		current += acpi_create_dmar_drhd_ds_pci(current, 0, 2, 0);
+
+		acpi_dmar_drhd_fixup(tmp, current);
+	}
+
+	/* VTVC0BAR has to be set, enabled, and in 32-bit space */
+	if (vtvc0bar && vtvc0en && !MCHBAR32(VTVC0BAR + 4)) {
+		const unsigned long tmp = current;
+		current += acpi_create_dmar_drhd(current,
+				DRHD_INCLUDE_PCI_ALL, 0, vtvc0bar);
+		current += acpi_create_dmar_drhd_ds_ioapic(current,
+				2, PCH_IOAPIC_PCI_BUS, PCH_IOAPIC_PCI_SLOT, 0);
+		size_t i;
+		for (i = 0; i < 8; ++i)
+			current += acpi_create_dmar_drhd_ds_msi_hpet(current,
+					0, PCH_HPET_PCI_BUS,
+					PCH_HPET_PCI_SLOT, i);
+		acpi_dmar_drhd_fixup(tmp, current);
+	}
+
+	return current;
+}
+
+unsigned long northbridge_write_acpi_tables(struct device *const dev,
+					    unsigned long current,
+					    struct acpi_rsdp *const rsdp)
+{
+	/* Create DMAR table only if we have VT-d capability. */
+	const u32 capid0_a = pci_read_config32(dev, CAPID0_A);
+	if (capid0_a & VTD_DISABLE)
+		return current;
+
+	acpi_dmar_t *const dmar = (acpi_dmar_t *)current;
+	printk(BIOS_DEBUG, "ACPI:    * DMAR\n");
+	acpi_create_dmar(dmar, DMAR_INTR_REMAP, acpi_fill_dmar);
+	current += dmar->header.length;
+	current = acpi_align_current(current);
+	acpi_add_table(rsdp, dmar);
+
+	return current;
+}
diff --git a/src/northbridge/intel/haswell/haswell.h b/src/northbridge/intel/haswell/haswell.h
index b7954e849916..25d88966de1f 100644
--- a/src/northbridge/intel/haswell/haswell.h
+++ b/src/northbridge/intel/haswell/haswell.h
@@ -212,6 +212,14 @@ void dump_mem(unsigned start, unsigned end);
 void report_platform_info(void);
 #endif /* !__SMM__ */
 
+#if ENV_RAMSTAGE && !defined(__SIMPLE_DEVICE__)
+#include <device/device.h>
+
+struct acpi_rsdp;
+unsigned long northbridge_write_acpi_tables(device_t device,
+		unsigned long start, struct acpi_rsdp *rsdp);
+#endif
+
 #endif
 #endif
 #endif /* __NORTHBRIDGE_INTEL_HASWELL_HASWELL_H__ */
diff --git a/src/northbridge/intel/haswell/northbridge.c b/src/northbridge/intel/haswell/northbridge.c
index 32be916a459d..f51eb35ee864 100644
--- a/src/northbridge/intel/haswell/northbridge.c
+++ b/src/northbridge/intel/haswell/northbridge.c
@@ -85,6 +85,7 @@ static struct device_operations pci_domain_ops = {
 	.init             = NULL,
 	.scan_bus         = pci_domain_scan_bus,
 	.ops_pci_bus	  = pci_bus_default_ops,
+	.write_acpi_tables = northbridge_write_acpi_tables,
 };
 
 static int get_bar(device_t dev, unsigned int index, u32 *base, u32 *len)