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authorRobin Holt <holt@sgi.com>2009-12-15 16:47:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:13 -0800
commit289750d1f1fd4a715baa2a2c6dd0cec2b8317fd7 (patch)
tree2c525297c460a9ab98b9649eb3021e534a8e77fd /drivers/misc/sgi-gru/grukservices.c
parentfae419f2abd15ab7d1cd1413e6683a276a4e14e2 (diff)
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>
Diffstat (limited to 'drivers/misc/sgi-gru/grukservices.c')
-rw-r--r--drivers/misc/sgi-gru/grukservices.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/misc/sgi-gru/grukservices.c b/drivers/misc/sgi-gru/grukservices.c
index 766e21e1557..d2b149facda 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,