x86/amd-iommu: Remove support for domain sharing

This patch makes device isolation mandatory and removes
support for the amd_iommu=share option. This simplifies the
code in several places.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 2 insertions, 8 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 14b60c0cdc70..ed58a1688391 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -148,7 +148,6 @@ DECLARE_STATS_COUNTER(alloced_io_mem);
 DECLARE_STATS_COUNTER(total_map_requests);
 
 static struct dentry *stats_dir;
-static struct dentry *de_isolate;
 static struct dentry *de_fflush;
 
 static void amd_iommu_stats_add(struct __iommu_counter *cnt)
@@ -166,9 +165,6 @@ static void amd_iommu_stats_init(void)
         if (stats_dir == NULL)
                 return;
 
-        de_isolate = debugfs_create_bool("isolation", 0444, stats_dir,
-                                         (u32 *)&amd_iommu_isolate);
-
         de_fflush  = debugfs_create_bool("fullflush", 0444, stats_dir,
                                          (u32 *)&amd_iommu_unmap_flush);
 
@@ -2135,11 +2131,9 @@ int __init amd_iommu_init_dma_ops(void)
         }
 
         /*
-         * If device isolation is enabled, pre-allocate the protection
-         * domains for each device.
+         * Pre-allocate the protection domains for each device.
          */
-        if (amd_iommu_isolate)
-                prealloc_protection_domains();
+        prealloc_protection_domains();
 
         iommu_detected = 1;
         swiotlb = 0;