intel-iommu: fix VT-d PMR disable for TXT on S3 resume
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>
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@ -141,6 +141,12 @@ static struct intel_iommu **g_iommus;
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static void __init check_tylersburg_isoch(void);
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static int rwbf_quirk;
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/*
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* set to 1 to panic kernel if can't successfully enable VT-d
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* (used when kernel is launched w/ TXT)
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*/
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static int force_on = 0;
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/*
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* 0: Present
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* 1-11: Reserved
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@ -2217,7 +2223,7 @@ static int __init iommu_prepare_static_identity_mapping(int hw)
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return 0;
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}
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static int __init init_dmars(int force_on)
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static int __init init_dmars(void)
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{
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struct dmar_drhd_unit *drhd;
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struct dmar_rmrr_unit *rmrr;
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@ -3117,7 +3123,17 @@ static int init_iommu_hw(void)
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if (iommu->qi)
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dmar_reenable_qi(iommu);
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for_each_active_iommu(iommu, drhd) {
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for_each_iommu(iommu, drhd) {
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if (drhd->ignored) {
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/*
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* we always have to disable PMRs or DMA may fail on
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* this device
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*/
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if (force_on)
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iommu_disable_protect_mem_regions(iommu);
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continue;
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}
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iommu_flush_write_buffer(iommu);
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iommu_set_root_entry(iommu);
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@ -3126,7 +3142,8 @@ static int init_iommu_hw(void)
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DMA_CCMD_GLOBAL_INVL);
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iommu->flush.flush_iotlb(iommu, 0, 0, 0,
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DMA_TLB_GLOBAL_FLUSH);
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iommu_enable_translation(iommu);
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if (iommu_enable_translation(iommu))
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return 1;
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iommu_disable_protect_mem_regions(iommu);
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}
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@ -3193,7 +3210,10 @@ static void iommu_resume(void)
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unsigned long flag;
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if (init_iommu_hw()) {
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WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
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if (force_on)
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panic("tboot: IOMMU setup failed, DMAR can not resume!\n");
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else
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WARN(1, "IOMMU setup failed, DMAR can not resume!\n");
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return;
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}
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@ -3270,7 +3290,6 @@ static struct notifier_block device_nb = {
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int __init intel_iommu_init(void)
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{
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int ret = 0;
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int force_on = 0;
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/* VT-d is required for a TXT/tboot launch, so enforce that */
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force_on = tboot_force_iommu();
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@ -3308,7 +3327,7 @@ int __init intel_iommu_init(void)
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init_no_remapping_devices();
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ret = init_dmars(force_on);
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ret = init_dmars();
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if (ret) {
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if (force_on)
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panic("tboot: Failed to initialize DMARs\n");
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