amd-iommu: add function to flush tlb for all devices

This function is required for suspend/resume support with AMD IOMMU
enabled.

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

diff --git a/arch/x86/include/asm/amd_iommu.h b/arch/x86/include/asm/amd_iommu.h
index 1750e1f..262e028 100644 (file)
--- a/arch/x86/include/asm/amd_iommu.h
+++ b/arch/x86/include/asm/amd_iommu.h
@@ -28,6 +28,7 @@ extern int amd_iommu_init_dma_ops(void);
 extern void amd_iommu_detect(void);
 extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
 extern void amd_iommu_flush_all_domains(void);
+extern void amd_iommu_flush_all_devices(void);
 #else
 static inline int amd_iommu_init(void) { return -ENODEV; }
 static inline void amd_iommu_detect(void) { }

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 826ad07..92b0e18 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -460,6 +460,24 @@ void amd_iommu_flush_all_domains(void)
        }
 }
 
+void amd_iommu_flush_all_devices(void)
+{
+       struct amd_iommu *iommu;
+       int i;
+
+       for (i = 0; i <= amd_iommu_last_bdf; ++i) {
+               if (amd_iommu_pd_table[i] == NULL)
+                       continue;
+
+               iommu = amd_iommu_rlookup_table[i];
+               if (!iommu)
+                       continue;
+
+               iommu_queue_inv_dev_entry(iommu, i);
+               iommu_completion_wait(iommu);
+       }
+}
+
 /****************************************************************************
  *
  * The functions below are used the create the page table mappings for