s390/topology: cleanup topology code

Mainly merge all different per-cpu arrays into a single array which
holds all topology information per logical cpu.
Also fix the broken core vs socket variable naming and simplify the
locking a bit.
When running in environments without topology information also
invent book, socket and core ids, so that not all ids are zero.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 54 insertions, 59 deletions

diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c
index dd55f7c20104..f1aba87cceb8 100644
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -29,48 +29,38 @@ struct mask_info {
         cpumask_t mask;
 };
 
-static int topology_enabled = 1;
+static void set_topology_timer(void);
 static void topology_work_fn(struct work_struct *work);
 static struct sysinfo_15_1_x *tl_info;
-static void set_topology_timer(void);
-static DECLARE_WORK(topology_work, topology_work_fn);
-/* topology_lock protects the core linked list */
-static DEFINE_SPINLOCK(topology_lock);
 
-static struct mask_info core_info;
-cpumask_t cpu_core_map[NR_CPUS];
-unsigned char cpu_core_id[NR_CPUS];
-unsigned char cpu_socket_id[NR_CPUS];
+static int topology_enabled = 1;
+static DECLARE_WORK(topology_work, topology_work_fn);
 
+/* topology_lock protects the socket and book linked lists */
+static DEFINE_SPINLOCK(topology_lock);
+static struct mask_info socket_info;
 static struct mask_info book_info;
-cpumask_t cpu_book_map[NR_CPUS];
-unsigned char cpu_book_id[NR_CPUS];
+
+struct cpu_topology_s390 cpu_topology[NR_CPUS];
 
 static cpumask_t cpu_group_map(struct mask_info *info, unsigned int cpu)
 {
         cpumask_t mask;
 
-        cpumask_clear(&mask);
-        if (!topology_enabled || !MACHINE_HAS_TOPOLOGY) {
-                cpumask_copy(&mask, cpumask_of(cpu));
+        cpumask_copy(&mask, cpumask_of(cpu));
+        if (!topology_enabled || !MACHINE_HAS_TOPOLOGY)
                 return mask;
+        for (; info; info = info->next) {
+                if (cpumask_test_cpu(cpu, &info->mask))
+                        return info->mask;
         }
-        while (info) {
-                if (cpumask_test_cpu(cpu, &info->mask)) {
-                        mask = info->mask;
-                        break;
-                }
-                info = info->next;
-        }
-        if (cpumask_empty(&mask))
-                cpumask_copy(&mask, cpumask_of(cpu));
         return mask;
 }
 
 static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu,
                                           struct mask_info *book,
-                                          struct mask_info *core,
-                                          int one_core_per_cpu)
+                                          struct mask_info *socket,
+                                          int one_socket_per_cpu)
 {
         unsigned int cpu;
 
@@ -80,28 +70,28 @@ static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu,
 
                 rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin;
                 lcpu = smp_find_processor_id(rcpu);
-                if (lcpu >= 0) {
-                        cpumask_set_cpu(lcpu, &book->mask);
-                        cpu_book_id[lcpu] = book->id;
-                        cpumask_set_cpu(lcpu, &core->mask);
-                        cpu_core_id[lcpu] = rcpu;
-                        if (one_core_per_cpu) {
-                                cpu_socket_id[lcpu] = rcpu;
-                                core = core->next;
-                        } else {
-                                cpu_socket_id[lcpu] = core->id;
-                        }
-                        smp_cpu_set_polarization(lcpu, tl_cpu->pp);
+                if (lcpu < 0)
+                        continue;
+                cpumask_set_cpu(lcpu, &book->mask);
+                cpu_topology[lcpu].book_id = book->id;
+                cpumask_set_cpu(lcpu, &socket->mask);
+                cpu_topology[lcpu].core_id = rcpu;
+                if (one_socket_per_cpu) {
+                        cpu_topology[lcpu].socket_id = rcpu;
+                        socket = socket->next;
+                } else {
+                        cpu_topology[lcpu].socket_id = socket->id;
                 }
+                smp_cpu_set_polarization(lcpu, tl_cpu->pp);
         }
-        return core;
+        return socket;
 }
 
 static void clear_masks(void)
 {
         struct mask_info *info;
 
-        info = &core_info;
+        info = &socket_info;
         while (info) {
                 cpumask_clear(&info->mask);
                 info = info->next;
@@ -120,9 +110,9 @@ static union topology_entry *next_tle(union topology_entry *tle)
         return (union topology_entry *)((struct topology_container *)tle + 1);
 }
 
-static void __tl_to_cores_generic(struct sysinfo_15_1_x *info)
+static void __tl_to_masks_generic(struct sysinfo_15_1_x *info)
 {
-        struct mask_info *core = &core_info;
+        struct mask_info *socket = &socket_info;
         struct mask_info *book = &book_info;
         union topology_entry *tle, *end;
 
@@ -135,11 +125,11 @@ static void __tl_to_cores_generic(struct sysinfo_15_1_x *info)
                         book->id = tle->container.id;
                         break;
                 case 1:
-                        core = core->next;
-                        core->id = tle->container.id;
+                        socket = socket->next;
+                        socket->id = tle->container.id;
                         break;
                 case 0:
-                        add_cpus_to_mask(&tle->cpu, book, core, 0);
+                        add_cpus_to_mask(&tle->cpu, book, socket, 0);
                         break;
                 default:
                         clear_masks();
@@ -149,9 +139,9 @@ static void __tl_to_cores_generic(struct sysinfo_15_1_x *info)
         }
 }
 
-static void __tl_to_cores_z10(struct sysinfo_15_1_x *info)
+static void __tl_to_masks_z10(struct sysinfo_15_1_x *info)
 {
-        struct mask_info *core = &core_info;
+        struct mask_info *socket = &socket_info;
         struct mask_info *book = &book_info;
         union topology_entry *tle, *end;
 
@@ -164,7 +154,7 @@ static void __tl_to_cores_z10(struct sysinfo_15_1_x *info)
                         book->id = tle->container.id;
                         break;
                 case 0:
-                        core = add_cpus_to_mask(&tle->cpu, book, core, 1);
+                        socket = add_cpus_to_mask(&tle->cpu, book, socket, 1);
                         break;
                 default:
                         clear_masks();
@@ -174,20 +164,20 @@ static void __tl_to_cores_z10(struct sysinfo_15_1_x *info)
         }
 }
 
-static void tl_to_cores(struct sysinfo_15_1_x *info)
+static void tl_to_masks(struct sysinfo_15_1_x *info)
 {
         struct cpuid cpu_id;
 
-        get_cpu_id(&cpu_id);
         spin_lock_irq(&topology_lock);
+        get_cpu_id(&cpu_id);
         clear_masks();
         switch (cpu_id.machine) {
         case 0x2097:
         case 0x2098:
-                __tl_to_cores_z10(info);
+                __tl_to_masks_z10(info);
                 break;
         default:
-                __tl_to_cores_generic(info);
+                __tl_to_masks_generic(info);
         }
         spin_unlock_irq(&topology_lock);
 }
@@ -232,15 +222,20 @@ int topology_set_cpu_management(int fc)
         return rc;
 }
 
-static void update_cpu_core_map(void)
+static void update_cpu_masks(void)
 {
         unsigned long flags;
         int cpu;
 
         spin_lock_irqsave(&topology_lock, flags);
         for_each_possible_cpu(cpu) {
-                cpu_core_map[cpu] = cpu_group_map(&core_info, cpu);
-                cpu_book_map[cpu] = cpu_group_map(&book_info, cpu);
+                cpu_topology[cpu].core_mask = cpu_group_map(&socket_info, cpu);
+                cpu_topology[cpu].book_mask = cpu_group_map(&book_info, cpu);
+                if (!MACHINE_HAS_TOPOLOGY) {
+                        cpu_topology[cpu].core_id = cpu;
+                        cpu_topology[cpu].socket_id = cpu;
+                        cpu_topology[cpu].book_id = cpu;
+                }
         }
         spin_unlock_irqrestore(&topology_lock, flags);
 }
@@ -260,13 +255,13 @@ int arch_update_cpu_topology(void)
         int cpu;
 
         if (!MACHINE_HAS_TOPOLOGY) {
-                update_cpu_core_map();
+                update_cpu_masks();
                 topology_update_polarization_simple();
                 return 0;
         }
         store_topology(info);
-        tl_to_cores(info);
-        update_cpu_core_map();
+        tl_to_masks(info);
+        update_cpu_masks();
         for_each_online_cpu(cpu) {
                 dev = get_cpu_device(cpu);
                 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
@@ -355,7 +350,7 @@ void __init s390_init_cpu_topology(void)
         for (i = 0; i < TOPOLOGY_NR_MAG; i++)
                 printk(KERN_CONT " %d", info->mag[i]);
         printk(KERN_CONT " / %d\n", info->mnest);
-        alloc_masks(info, &core_info, 1);
+        alloc_masks(info, &socket_info, 1);
         alloc_masks(info, &book_info, 2);
 }
 
@@ -454,7 +449,7 @@ static int __init topology_init(void)
         }
         set_topology_timer();
 out:
-        update_cpu_core_map();
+        update_cpu_masks();
         return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
 }
 device_initcall(topology_init);