summaryrefslogtreecommitdiff
path: root/src
diff options
context:
space:
mode:
authorNico Huber <nico.h@gmx.de>2018-11-17 14:09:25 +0100
committerNico Huber <nico.h@gmx.de>2019-01-25 09:45:46 +0000
commitb32347415de85199cb0178a2c8c89deae20a1866 (patch)
tree6c41489d82c07c9de9ee9e72e8ca7d6bd861d040 /src
parente583dd3d5170185e7b489c93345539f9f2d70a8e (diff)
downloadcoreboot-b32347415de85199cb0178a2c8c89deae20a1866.tar.xz
nb/intel/sandybridge/acpi: Add RMRR entry for iGPU
The iGPU always needs access to its stolen memory. For proper IOMMU support, we have to make the OS aware of that. Directly below TOLUD lies the data stolen memory (BDSM) followed by the GTT stolen memory (BGSM), the iGPU needs access to both. Change-Id: I391d0a5f1ea14bc90fbacabce41dddfa12b5bb0d Signed-off-by: Nico Huber <nico.h@gmx.de> Reviewed-on: https://review.coreboot.org/c/29668 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Diffstat (limited to 'src')
-rw-r--r--src/northbridge/intel/sandybridge/acpi.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/src/northbridge/intel/sandybridge/acpi.c b/src/northbridge/intel/sandybridge/acpi.c
index c7914a0a45..48be666367 100644
--- a/src/northbridge/intel/sandybridge/acpi.c
+++ b/src/northbridge/intel/sandybridge/acpi.c
@@ -17,6 +17,7 @@
#include <types.h>
#include <console/console.h>
+#include <commonlib/helpers.h>
#include <arch/acpi.h>
#include <device/device.h>
#include <device/pci.h>
@@ -66,16 +67,42 @@ unsigned long acpi_fill_mcfg(unsigned long current)
return current;
}
+static unsigned long acpi_create_igfx_rmrr(const unsigned long current)
+{
+ const u32 base_mask = ~(u32)(MiB - 1);
+
+ struct device *const host = dev_find_slot(0, PCI_DEVFN(0, 0));
+ if (!host)
+ return 0;
+
+ const u32 bgsm = pci_read_config32(host, BGSM) & base_mask;
+ const u32 tolud = pci_read_config32(host, TOLUD) & base_mask;
+ if (!bgsm || !tolud)
+ return 0;
+
+ return acpi_create_dmar_rmrr(current, 0, bgsm, tolud - 1);
+}
+
static unsigned long acpi_fill_dmar(unsigned long current)
{
const struct device *const igfx = pcidev_on_root(2, 0);
if (igfx && igfx->enabled) {
- const unsigned long tmp = current;
+ unsigned long tmp;
+
+ tmp = current;
current += acpi_create_dmar_drhd(current, 0, 0, IOMMU_BASE1);
current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
current += acpi_create_dmar_ds_pci(current, 0, 2, 1);
acpi_dmar_drhd_fixup(tmp, current);
+
+ tmp = current;
+ current += acpi_create_igfx_rmrr(current);
+ if (current != tmp) {
+ current += acpi_create_dmar_ds_pci(current, 0, 2, 0);
+ current += acpi_create_dmar_ds_pci(current, 0, 2, 1);
+ acpi_dmar_rmrr_fixup(tmp, current);
+ }
}
const unsigned long tmp = current;