x86/platform/UV: Fix problem with UV4 Socket IDs not being contiguous

The UV4 Socket IDs are not guaranteed to equate to Node values which
can cause the GAM (Global Addressable Memory) table lookups to fail.
Fix this by using an independent index into the GAM table instead of
the Socket ID to reference the base address.

Tested-by: Frank Ramsay <framsay@sgi.com>
Tested-by: John Estabrook <estabrook@sgi.com>
Signed-off-by: Mike Travis <travis@sgi.com>
Reviewed-by: Dimitri Sivanich <sivanich@sgi.com>
Reviewed-by: Nathan Zimmer <nzimmer@sgi.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andrew Banman <abanman@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <rja@sgi.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160801184050.048755337@asylum.americas.sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 09b59adaea3f5499c1c3da0473e79f8f40695037..d9187336aa2efec6334ac731386e2fddcc0a1a16 100644 (file)
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -325,7 +325,7 @@ static __init void build_uv_gr_table(void)
        struct uv_gam_range_entry *gre = uv_gre_table;
        struct uv_gam_range_s *grt;
        unsigned long last_limit = 0, ram_limit = 0;
-       int bytes, i, sid, lsid = -1;
+       int bytes, i, sid, lsid = -1, indx = 0, lindx = -1;
 
        if (!gre)
                return;
@@ -356,11 +356,12 @@ static __init void build_uv_gr_table(void)
                }
                sid = gre->sockid - _min_socket;
                if (lsid < sid) {               /* new range */
-                       grt = &_gr_table[sid];
-                       grt->base = lsid;
+                       grt = &_gr_table[indx];
+                       grt->base = lindx;
                        grt->nasid = gre->nasid;
                        grt->limit = last_limit = gre->limit;
                        lsid = sid;
+                       lindx = indx++;
                        continue;
                }
                if (lsid == sid && !ram_limit) {        /* update range */
@@ -371,7 +372,7 @@ static __init void build_uv_gr_table(void)
                }
                if (!ram_limit) {               /* non-contiguous ram range */
                        grt++;
-                       grt->base = sid - 1;
+                       grt->base = lindx;
                        grt->nasid = gre->nasid;
                        grt->limit = last_limit = gre->limit;
                        continue;