[IA64-SGI] move nodepda pointer out of pda

Remove the p_nodepda and p_subnodepda pointers from the pda_s structure.
And then define a new per-cpu pointer to the nodepda and export it so
that it can be accessed by kernel modules.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

4 files changed, 22 insertions, 28 deletions

diff --git a/arch/ia64/sn/kernel/setup.c b/arch/ia64/sn/kernel/setup.c
index fea71ee891eb..4fb44984afe6 100644
--- a/arch/ia64/sn/kernel/setup.c
+++ b/arch/ia64/sn/kernel/setup.c
@@ -76,6 +76,9 @@ EXPORT_PER_CPU_SYMBOL(__sn_hub_info);
 DEFINE_PER_CPU(short, __sn_cnodeid_to_nasid[MAX_NUMNODES]);
 EXPORT_PER_CPU_SYMBOL(__sn_cnodeid_to_nasid);
 
+DEFINE_PER_CPU(struct nodepda_s *, __sn_nodepda);
+EXPORT_PER_CPU_SYMBOL(__sn_nodepda);
+
 partid_t sn_partid = -1;
 EXPORT_SYMBOL(sn_partid);
 char sn_system_serial_number_string[128];
@@ -480,7 +483,8 @@ void __init sn_cpu_init(void)
 
         cnode = nasid_to_cnodeid(nasid);
 
-        pda->p_nodepda = nodepdaindr[cnode];
+        sn_nodepda = nodepdaindr[cnode];
+
         pda->led_address =
             (typeof(pda->led_address)) (LED0 + (slice << LED_CPU_SHIFT));
         pda->led_state = LED_ALWAYS_SET;
@@ -626,7 +630,8 @@ nasid_slice_to_cpuid(int nasid, int slice)
         long cpu;
         
         for (cpu=0; cpu < NR_CPUS; cpu++) 
-                if (nodepda->phys_cpuid[cpu].nasid == nasid && nodepda->phys_cpuid[cpu].slice == slice)
+                if (cpuid_to_nasid(cpu) == nasid &&
+                                        cpuid_to_slice(cpu) == slice)
                         return cpu;
 
         return -1;
diff --git a/include/asm-ia64/sn/nodepda.h b/include/asm-ia64/sn/nodepda.h
index 13cc1002b294..7138b1eafd6b 100644
--- a/include/asm-ia64/sn/nodepda.h
+++ b/include/asm-ia64/sn/nodepda.h
@@ -13,7 +13,6 @@
 #include <asm/irq.h>
 #include <asm/sn/arch.h>
 #include <asm/sn/intr.h>
-#include <asm/sn/pda.h>
 #include <asm/sn/bte.h>
 
 /*
@@ -67,20 +66,18 @@ typedef struct nodepda_s nodepda_t;
  * The next set of definitions provides this.
  * Routines are expected to use 
  *
- *      nodepda                 -> to access node PDA for the node on which code is running
- *      subnodepda              -> to access subnode PDA for the subnode on which code is running
- *
- *      NODEPDA(cnode)          -> to access node PDA for cnodeid 
- *      SUBNODEPDA(cnode,sn)    -> to access subnode PDA for cnodeid/subnode
+ *      sn_nodepda   - to access node PDA for the node on which code is running
+ *      NODEPDA(cnodeid)   - to access node PDA for cnodeid
  */
 
-#define nodepda         pda->p_nodepda          /* Ptr to this node's PDA */
-#define NODEPDA(cnode)          (nodepda->pernode_pdaindr[cnode])
+DECLARE_PER_CPU(struct nodepda_s *, __sn_nodepda);
+#define sn_nodepda              (__get_cpu_var(__sn_nodepda))
+#define NODEPDA(cnodeid)        (sn_nodepda->pernode_pdaindr[cnodeid])
 
 /*
  * Check if given a compact node id the corresponding node has all the
  * cpus disabled. 
  */
-#define is_headless_node(cnode)         (nr_cpus_node(cnode) == 0)
+#define is_headless_node(cnodeid)       (nr_cpus_node(cnodeid) == 0)
 
 #endif /* _ASM_IA64_SN_NODEPDA_H */
diff --git a/include/asm-ia64/sn/pda.h b/include/asm-ia64/sn/pda.h
index a5340cfe9bab..ea5590c76ca4 100644
--- a/include/asm-ia64/sn/pda.h
+++ b/include/asm-ia64/sn/pda.h
@@ -24,14 +24,6 @@
 
 typedef struct pda_s {
 
-        /* Having a pointer in the begining of PDA tends to increase
-         * the chance of having this pointer in cache. (Yes something
-         * else gets pushed out). Doing this reduces the number of memory
-         * access to all nodepda variables to be one
-         */
-        struct nodepda_s *p_nodepda;            /* Pointer to Per node PDA */
-        struct subnodepda_s *p_subnodepda;      /* Pointer to CPU  subnode PDA */
-
         /*
          * Support for SN LEDs
          */
diff --git a/include/asm-ia64/sn/sn_cpuid.h b/include/asm-ia64/sn/sn_cpuid.h
index 6b44290aaab4..20b300187669 100644
--- a/include/asm-ia64/sn/sn_cpuid.h
+++ b/include/asm-ia64/sn/sn_cpuid.h
@@ -92,24 +92,24 @@
  * NOTE: on non-MP systems, only cpuid 0 exists
  */
 
-extern short physical_node_map[];                       /* indexed by nasid to get cnode */
+extern short physical_node_map[];       /* indexed by nasid to get cnode */
 
 /*
  * Macros for retrieving info about current cpu
  */
-#define get_nasid()                     (nodepda->phys_cpuid[smp_processor_id()].nasid)
-#define get_subnode()                   (nodepda->phys_cpuid[smp_processor_id()].subnode)
-#define get_slice()                     (nodepda->phys_cpuid[smp_processor_id()].slice)
-#define get_cnode()                     (nodepda->phys_cpuid[smp_processor_id()].cnode)
-#define get_sapicid()                   ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff)
+#define get_nasid()     (sn_nodepda->phys_cpuid[smp_processor_id()].nasid)
+#define get_subnode()   (sn_nodepda->phys_cpuid[smp_processor_id()].subnode)
+#define get_slice()     (sn_nodepda->phys_cpuid[smp_processor_id()].slice)
+#define get_cnode()     (sn_nodepda->phys_cpuid[smp_processor_id()].cnode)
+#define get_sapicid()   ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff)
 
 /*
  * Macros for retrieving info about an arbitrary cpu
  *      cpuid - logical cpu id
  */
-#define cpuid_to_nasid(cpuid)           (nodepda->phys_cpuid[cpuid].nasid)
-#define cpuid_to_subnode(cpuid)         (nodepda->phys_cpuid[cpuid].subnode)
-#define cpuid_to_slice(cpuid)           (nodepda->phys_cpuid[cpuid].slice)
+#define cpuid_to_nasid(cpuid)           (sn_nodepda->phys_cpuid[cpuid].nasid)
+#define cpuid_to_subnode(cpuid)         (sn_nodepda->phys_cpuid[cpuid].subnode)
+#define cpuid_to_slice(cpuid)           (sn_nodepda->phys_cpuid[cpuid].slice)
 #define cpuid_to_cnodeid(cpuid)         (physical_node_map[cpuid_to_nasid(cpuid)])