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intel-iommu: fix VT-d PMR disable for TXT on S3 resume

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This patch is a follow on to https://lkml.org/lkml/2011/3/21/239, which
was merged as commit 51a63e67da.

This patch adds support for S3, as pointed out by Chris Wright.

Signed-off-by: Joseph Cihula <joseph.cihula@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Joseph Cihula 2011-05-03 00:08:37 -07:00 committed by David Woodhouse
parent 61c4f2c81c
commit b779260b09
1 changed files with 25 additions and 6 deletions
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31
drivers/pci/intel-iommu.c
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@ -141,6 +141,12 @@ static struct intel_iommu **g_iommus;
static void __init check_tylersburg_isoch(void);
static int rwbf_quirk;
/*
* set to 1 to panic kernel if can't successfully enable VT-d
* (used when kernel is launched w/ TXT)
*/
static int force_on = 0;
/*
* 0: Present
* 1-11: Reserved
@ -2217,7 +2223,7 @@ static int __init iommu_prepare_static_identity_mapping(int hw)
return 0;
}
static int __init init_dmars(int force_on)
static int __init init_dmars(void)
{
struct dmar_drhd_unit *drhd;
struct dmar_rmrr_unit *rmrr;
@ -3117,7 +3123,17 @@ static int init_iommu_hw(void)
if (iommu->qi)
dmar_reenable_qi(iommu);
for_each_active_iommu(iommu, drhd) {
for_each_iommu(iommu, drhd) {
if (drhd->ignored) {
/*
* we always have to disable PMRs or DMA may fail on
* this device
*/
if (force_on)
iommu_disable_protect_mem_regions(iommu);
continue;
}
iommu_flush_write_buffer(iommu);
iommu_set_root_entry(iommu);
@ -3126,7 +3142,8 @@ static int init_iommu_hw(void)
DMA_CCMD_GLOBAL_INVL);
iommu->flush.flush_iotlb(iommu, 0, 0, 0,
DMA_TLB_GLOBAL_FLUSH);
iommu_enable_translation(iommu);
if (iommu_enable_translation(iommu))
return 1;
iommu_disable_protect_mem_regions(iommu);
}
@ -3193,7 +3210,10 @@ static void iommu_resume(void)
unsigned long flag;
if (init_iommu_hw()) {
WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
if (force_on)
panic("tboot: IOMMU setup failed, DMAR can not resume!\n");
else
WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
return;
}
@ -3270,7 +3290,6 @@ static struct notifier_block device_nb = {
int __init intel_iommu_init(void)
{
int ret = 0;
int force_on = 0;
/* VT-d is required for a TXT/tboot launch, so enforce that */
force_on = tboot_force_iommu();
@ -3308,7 +3327,7 @@ int __init intel_iommu_init(void)
init_no_remapping_devices();
ret = init_dmars(force_on);
ret = init_dmars();
if (ret) {
if (force_on)
panic("tboot: Failed to initialize DMARs\n");