ntb_hw_switchtec: Added support of >=4G memory windows

Current Switchtec's BAR setup registers are limited to 32bits,
corresponding to the maximum MW (memory window) size is <4G.

Increase the MW sizes with the addition of the BAR Setup Extension
Register for the upper 32bits of a 64bits MW size. This increases the MW
range to between 4K and 2^63.

Reported-by: Boris Glimcher <boris.glimcher@emc.com>
Signed-off-by: Paul Selles <paul.selles@microchip.com>
Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

1 files changed, 5 insertions, 1 deletions

diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h
index 32b282cd0ead..52a079b3a9a6 100644
--- a/include/linux/switchtec.h
+++ b/include/linux/switchtec.h
@@ -248,7 +248,11 @@ struct ntb_ctrl_regs {
                 u32 win_size;
                 u64 xlate_addr;
         } bar_entry[6];
-        u32 reserved2[216];
+        struct {
+                u32 win_size;
+                u32 reserved[3];
+        } bar_ext_entry[6];
+        u32 reserved2[192];
         u32 req_id_table[512];
         u32 reserved3[256];
         u64 lut_entry[512];