iommu/vt-d: Disable translation if already enabled

This patch disables translation(dma-remapping) before its initialization
if it is already enabled.

This is needed for kexec/kdump boot. If dma-remapping is enabled in the
first kernel, it need to be disabled before initializing its page table
during second kernel boot. Wei Hu also reported that this is needed
when second kernel boots with intel_iommu=off.

Basically iommu->gcmd is used to know whether translation is enabled or
disabled, but it is always zero at boot time even when translation is
enabled since iommu->gcmd is initialized without considering such a
case. Therefor this patch synchronizes iommu->gcmd value with global
command register when iommu structure is allocated.

Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 9f8aa07360baa168404996b66d746f7099fd6eae..f7890edb22f5e9f8c5697f37c72ed6c328dae1e6 100644 (file)
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -645,7 +645,7 @@ out:
 int alloc_iommu(struct dmar_drhd_unit *drhd)
 {
        struct intel_iommu *iommu;
-       u32 ver;
+       u32 ver, sts;
        static int iommu_allocated = 0;
        int agaw = 0;
        int msagaw = 0;
@@ -695,6 +695,15 @@ int alloc_iommu(struct dmar_drhd_unit *drhd)
                (unsigned long long)iommu->cap,
                (unsigned long long)iommu->ecap);
 
+       /* Reflect status in gcmd */
+       sts = readl(iommu->reg + DMAR_GSTS_REG);
+       if (sts & DMA_GSTS_IRES)
+               iommu->gcmd |= DMA_GCMD_IRE;
+       if (sts & DMA_GSTS_TES)
+               iommu->gcmd |= DMA_GCMD_TE;
+       if (sts & DMA_GSTS_QIES)
+               iommu->gcmd |= DMA_GCMD_QIE;
+
        raw_spin_lock_init(&iommu->register_lock);
 
        drhd->iommu = iommu;

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 0099667a397efb3d11edfd582eb4aa4fa3c78009..414d2d20dd59ae0560d3f7a2251eff6e78633ac7 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3665,6 +3665,7 @@ static struct notifier_block device_nb = {
 int __init intel_iommu_init(void)
 {
        int ret = 0;
+       struct dmar_drhd_unit *drhd;
 
        /* VT-d is required for a TXT/tboot launch, so enforce that */
        force_on = tboot_force_iommu();
@@ -3675,6 +3676,20 @@ int __init intel_iommu_init(void)
                return  -ENODEV;
        }
 
+       /*
+        * Disable translation if already enabled prior to OS handover.
+        */
+       for_each_drhd_unit(drhd) {
+               struct intel_iommu *iommu;
+
+               if (drhd->ignored)
+                       continue;
+
+               iommu = drhd->iommu;
+               if (iommu->gcmd & DMA_GCMD_TE)
+                       iommu_disable_translation(iommu);
+       }
+
        if (dmar_dev_scope_init() < 0) {
                if (force_on)
                        panic("tboot: Failed to initialize DMAR device scope\n");