1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c
index 766e21e15574..d2b149facda1 100644
--- a/drivers/misc/sgi-gru/grukservices.c
+++ b/drivers/misc/sgi-gru/grukservices.c
@@ -858,6 +858,29 @@ EXPORT_SYMBOL_GPL(gru_get_next_message);
 /* ---------------------- GRU DATA COPY FUNCTIONS ---------------------------*/
 
 /*
+ * Load a DW from a global GPA. The GPA can be a memory or MMR address.
+ */
+int gru_read_gpa(unsigned long *value, unsigned long gpa)
+{
+        void *cb;
+        void *dsr;
+        int ret, iaa;
+
+        STAT(read_gpa);
+        if (gru_get_cpu_resources(GRU_NUM_KERNEL_DSR_BYTES, &cb, &dsr))
+                return MQE_BUG_NO_RESOURCES;
+        iaa = gpa >> 62;
+        gru_vload_phys(cb, gpa, gru_get_tri(dsr), iaa, IMA);
+        ret = gru_wait(cb);
+        if (ret == CBS_IDLE)
+                *value = *(unsigned long *)dsr;
+        gru_free_cpu_resources(cb, dsr);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(gru_read_gpa);
+
+
+/*
  * Copy a block of data using the GRU resources
  */
 int gru_copy_gpa(unsigned long dest_gpa, unsigned long src_gpa,