[POWERPC] cell: add cbe_node_to_cpu function

This patch adds code to deal with conversion of
logical cpu to cbe nodes. It removes code that
assummed there were two logical CPUs per CBE.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

3 files changed, 45 insertions, 14 deletions

diff --git a/arch/powerpc/oprofile/op_model_cell.c b/arch/powerpc/oprofile/op_model_cell.c
index e08e1d7b3dc5..fb999e3e9f21 100644
--- a/arch/powerpc/oprofile/op_model_cell.c
+++ b/arch/powerpc/oprofile/op_model_cell.c
@@ -37,6 +37,7 @@
 #include <asm/system.h>
 
 #include "../platforms/cell/interrupt.h"
+#include "../platforms/cell/cbe_regs.h"
 
 #define PPU_CYCLES_EVENT_NUM 1  /*  event number for CYCLES */
 #define PPU_CYCLES_GRP_NUM   1  /* special group number for identifying
diff --git a/arch/powerpc/platforms/cell/cbe_regs.c b/arch/powerpc/platforms/cell/cbe_regs.c
index 7c94af4ac439..dca39c0af7ea 100644
--- a/arch/powerpc/platforms/cell/cbe_regs.c
+++ b/arch/powerpc/platforms/cell/cbe_regs.c
@@ -38,8 +38,13 @@ static struct cbe_thread_map
 {
         struct device_node *cpu_node;
         struct cbe_regs_map *regs;
+        unsigned int thread_id;
+        unsigned int cbe_id;
 } cbe_thread_map[NR_CPUS];
 
+static cpumask_t cbe_local_mask[MAX_CBE] = { [0 ... MAX_CBE-1] = CPU_MASK_NONE };
+static cpumask_t cbe_first_online_cpu = CPU_MASK_NONE;
+
 static struct cbe_regs_map *cbe_find_map(struct device_node *np)
 {
         int i;
@@ -130,31 +135,40 @@ struct cbe_mic_tm_regs __iomem *cbe_get_cpu_mic_tm_regs(int cpu)
 }
 EXPORT_SYMBOL_GPL(cbe_get_cpu_mic_tm_regs);
 
-/* FIXME
- * This is little more than a stub at the moment.  It should be
- * fleshed out so that it works for both SMT and non-SMT, no
- * matter if the passed cpu is odd or even.
- * For SMT enabled, returns 0 for even-numbered cpu; otherwise 1.
- * For SMT disabled, returns 0 for all cpus.
- */
 u32 cbe_get_hw_thread_id(int cpu)
 {
-        return (cpu & 1);
+        return cbe_thread_map[cpu].thread_id;
 }
 EXPORT_SYMBOL_GPL(cbe_get_hw_thread_id);
 
+u32 cbe_cpu_to_node(int cpu)
+{
+        return cbe_thread_map[cpu].cbe_id;
+}
+EXPORT_SYMBOL_GPL(cbe_cpu_to_node);
+
+u32 cbe_node_to_cpu(int node)
+{
+        return find_first_bit( (unsigned long *) &cbe_local_mask[node], sizeof(cpumask_t));
+}
+EXPORT_SYMBOL_GPL(cbe_node_to_cpu);
+
 void __init cbe_regs_init(void)
 {
         int i;
+        unsigned int thread_id;
         struct device_node *cpu;
 
         /* Build local fast map of CPUs */
-        for_each_possible_cpu(i)
-                cbe_thread_map[i].cpu_node = of_get_cpu_node(i, NULL);
+        for_each_possible_cpu(i) {
+                cbe_thread_map[i].cpu_node = of_get_cpu_node(i, &thread_id);
+                cbe_thread_map[i].thread_id = thread_id;
+        }
 
         /* Find maps for each device tree CPU */
         for_each_node_by_type(cpu, "cpu") {
-                struct cbe_regs_map *map = &cbe_regs_maps[cbe_regs_map_count++];
+                struct cbe_regs_map *map;
+                unsigned int cbe_id;
 
                 /* That hack must die die die ! */
                 const struct address_prop {
@@ -162,6 +176,8 @@ void __init cbe_regs_init(void)
                         unsigned int len;
                 } __attribute__((packed)) *prop;
 
+                cbe_id = cbe_regs_map_count++;
+                map = &cbe_regs_maps[cbe_id];
 
                 if (cbe_regs_map_count > MAX_CBE) {
                         printk(KERN_ERR "cbe_regs: More BE chips than supported"
@@ -170,9 +186,18 @@ void __init cbe_regs_init(void)
                         return;
                 }
                 map->cpu_node = cpu;
-                for_each_possible_cpu(i)
-                        if (cbe_thread_map[i].cpu_node == cpu)
-                                cbe_thread_map[i].regs = map;
+
+                for_each_possible_cpu(i) {
+                        struct cbe_thread_map *thread = &cbe_thread_map[i];
+
+                        if (thread->cpu_node == cpu) {
+                                thread->regs = map;
+                                thread->cbe_id = cbe_id;
+                                cpu_set(i, cbe_local_mask[cbe_id]);
+                                if(thread->thread_id == 0)
+                                        cpu_set(i, cbe_first_online_cpu);
+                        }
+                }
 
                 prop = of_get_property(cpu, "pervasive", NULL);
                 if (prop != NULL)
diff --git a/arch/powerpc/platforms/cell/cbe_regs.h b/arch/powerpc/platforms/cell/cbe_regs.h
index 440a7ecc66ea..17d597144877 100644
--- a/arch/powerpc/platforms/cell/cbe_regs.h
+++ b/arch/powerpc/platforms/cell/cbe_regs.h
@@ -255,6 +255,11 @@ struct cbe_mic_tm_regs {
 extern struct cbe_mic_tm_regs __iomem *cbe_get_mic_tm_regs(struct device_node *np);
 extern struct cbe_mic_tm_regs __iomem *cbe_get_cpu_mic_tm_regs(int cpu);
 
+/* some utility functions to deal with SMT */
+extern u32 cbe_get_hw_thread_id(int cpu);
+extern u32 cbe_cpu_to_node(int cpu);
+extern u32 cbe_node_to_cpu(int node);
+
 /* Init this module early */
 extern void cbe_regs_init(void);