[patch 1/8] x86: UV - Introduce a means to translate from gpa -> socket_paddr.

[Robin Holt]

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.

To: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Robin Holt <holt@xxxxxxx>
Cc: Jack Steiner <steiner@xxxxxxx>
Cc: lkml <linux-kernel@xxxxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxxxxxxxx

---

 arch/x86/include/asm/uv/uv_hub.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)


Index: linux-x86/arch/x86/include/asm/uv/uv_hub.h
===================================================================
--- linux-x86.orig/arch/x86/include/asm/uv/uv_hub.h	2009-11-09 08:46:25.000000000 -0600
+++ linux-x86/arch/x86/include/asm/uv/uv_hub.h	2009-11-09 08:50:25.000000000 -0600
@@ -232,6 +232,19 @@ static inline unsigned long uv_gpa(void 
 	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)
 {

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