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soc/skylake: Make VT-d controllable from CMOS option

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Make VT-d enable or disable based on CMOS value "vtd"
1 = Enable
0 = Disable

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I1aea14968e08ee6af822bd259ca1d462f8926994
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56252
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>
This commit is contained in:
Sean Rhodes
2021-07-13 07:23:22 +01:00
committed by Felix Held
parent bc89bc6680
commit 66c8062a00
4 changed files with 10 additions and 5 deletions
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9
src/soc/intel/skylake/systemagent.c
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@@ -6,15 +6,20 @@
#include <device/pci_ops.h>
#include <intelblocks/power_limit.h>
#include <intelblocks/systemagent.h>
#include <option.h>
#include <soc/cpu.h>
#include <soc/iomap.h>
#include <soc/msr.h>
#include <soc/pci_devs.h>
#include <soc/systemagent.h>
#include <types.h>
#include "chip.h"
bool soc_is_vtd_capable(void)
bool soc_vtd_enabled(void)
{
const unsigned int vtd = get_uint_option("vtd", 1);
if (!vtd)
return false;
struct device *const root_dev = pcidev_path_on_root(SA_DEVFN_ROOT);
return root_dev &&
!(pci_read_config32(root_dev, CAPID0_A) & VTD_DISABLE);
@@ -41,7 +46,7 @@ void soc_add_fixed_mmio_resources(struct device *dev, int *index)
sa_add_fixed_mmio_resources(dev, index, soc_fixed_resources,
ARRAY_SIZE(soc_fixed_resources));
if (soc_is_vtd_capable()) {
if (soc_vtd_enabled()) {
if (is_devfn_enabled(SA_DEVFN_IGD))
sa_add_fixed_mmio_resources(dev, index,
&soc_gfxvt_mmio_descriptor, 1);