x86: uv: introduce a means to translate from gpa -> socket_paddr
The UV BIOS has been updated to implement some of our interface
functionality differently than originally expected. These patches update
the kernel to the bios implementation and include a few minor bug fixes
which prevent us from doing significant testing on real hardware.
This patch:
For SGI UV systems, translate from a global physical address back to a
socket physical address. This does nothing to ensure the socket physical
address is actually addressable by the kernel. That is the responsibility
of the user of the function.
Signed-off-by: Robin Holt <holt@sgi.com>
Cc: 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>
diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index d1414af..0cc955f 100644
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -232,6 +232,19 @@
return uv_soc_phys_ram_to_gpa(__pa(v));
}
+/* UV global physical address --> socket phys RAM */
+static inline unsigned long uv_gpa_to_soc_phys_ram(unsigned long gpa)
+{
+ unsigned long paddr = gpa & uv_hub_info->gpa_mask;
+ unsigned long remap_base = uv_hub_info->lowmem_remap_base;
+ unsigned long remap_top = uv_hub_info->lowmem_remap_top;
+
+ if (paddr >= remap_base && paddr < remap_base + remap_top)
+ paddr -= remap_base;
+ return paddr;
+}
+
+
/* gnode -> pnode */
static inline unsigned long uv_gpa_to_gnode(unsigned long gpa)
{