X86: uv: implement a gru_read_gpa kernel function

The BIOS has decided to store a pointer to the partition reserved page in
a scratch MMR.  The GRU is only able to read an MMR using a vload
instruction.  The gru_read_gpa() function will implemented.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Jack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/gru_instructions.h b/drivers/misc/sgi-gru/gru_instructions.h
index 3c9c06618e6a..e033b6ce4a3f 100644
--- a/drivers/misc/sgi-gru/gru_instructions.h
+++ b/drivers/misc/sgi-gru/gru_instructions.h
@@ -340,6 +340,19 @@ static inline void gru_start_instruction(struct gru_instruction *ins, int op32)
  *      - nelem and stride are in elements
  *      - tri0/tri1 is in bytes for the beginning of the data segment.
  */
+static inline void gru_vload_phys(void *cb, unsigned long gpa,
+                unsigned int tri0, int iaa, unsigned long hints)
+{
+        struct gru_instruction *ins = (struct gru_instruction *)cb;
+
+        ins->baddr0 = (long)gpa | ((unsigned long)iaa << 62);
+        ins->nelem = 1;
+        ins->tri0 = tri0;
+        ins->op1_stride = 1;
+        gru_start_instruction(ins, __opword(OP_VLOAD, 0, XTYPE_DW, iaa, 0,
+                                        CB_IMA(hints)));
+}
+
 static inline void gru_vload(void *cb, unsigned long mem_addr,
                 unsigned int tri0, unsigned char xtype, unsigned long nelem,
                 unsigned long stride, unsigned long hints)