1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/pci/intel-iommu.h b/drivers/pci/intel-iommu.h
index eb167e39b464..3a650e8cba33 100644
--- a/drivers/pci/intel-iommu.h
+++ b/drivers/pci/intel-iommu.h
@@ -177,6 +177,21 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define dma_frcd_source_id(c) (c & 0xffff)
 #define dma_frcd_page_addr(d) (d & (((u64)-1) << 12)) /* low 64 bit */
 
+#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) /* 10sec */
+
+#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
+{\
+        cycles_t start_time = get_cycles();\
+        while (1) {\
+                sts = op (iommu->reg + offset);\
+                if (cond)\
+                        break;\
+                if (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\
+                        panic("DMAR hardware is malfunctioning\n");\
+                cpu_relax();\
+        }\
+}
+
 struct intel_iommu {
         void __iomem    *reg; /* Pointer to hardware regs, virtual addr */
         u64             cap;