[PATCH] s390: additional_cpus parameter

Introduce additional_cpus command line option.  By default no additional cpu
can be attached to the system anymore.  Only the cpus present at IPL time can
be switched on/off.  If it is desired that additional cpus can be attached to
the system the maximum number of additional cpus needs to be specified with
this option.

This change is necessary in order to limit the waste of per_cpu data
structures.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/Documentation/cpu-hotplug.txt b/Documentation/cpu-hotplug.txt
index e05278087ffaa04c90afd11bf85ff5629f814507..4d3355da0e268c5d1cdd93921301272b25e4a920 100644 (file)
--- a/Documentation/cpu-hotplug.txt
+++ b/Documentation/cpu-hotplug.txt
@@ -11,6 +11,8 @@
                        Joel Schopp <jschopp@austin.ibm.com>
                ia64/x86_64:
                        Ashok Raj <ashok.raj@intel.com>
+               s390:
+                       Heiko Carstens <heiko.carstens@de.ibm.com>
 
 Authors: Ashok Raj <ashok.raj@intel.com>
 Lots of feedback: Nathan Lynch <nathanl@austin.ibm.com>,
@@ -44,11 +46,9 @@ maxcpus=n    Restrict boot time cpus to n. Say if you have 4 cpus, using
              maxcpus=2 will only boot 2. You can choose to bring the
              other cpus later online, read FAQ's for more info.
 
-additional_cpus*=n     Use this to limit hotpluggable cpus. This option sets
-                       cpu_possible_map = cpu_present_map + additional_cpus
-
-(*) Option valid only for following architectures
-- x86_64, ia64
+additional_cpus=n      [x86_64, s390 only] use this to limit hotpluggable cpus.
+                          This option sets
+                       cpu_possible_map = cpu_present_map + additional_cpus
 
 ia64 and x86_64 use the number of disabled local apics in ACPI tables MADT
 to determine the number of potentially hot-pluggable cpus. The implementation

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index de8784267473a1c16a3922005b5ec50ece22df3d..24f62f16c0e5e8640559ad3ae8b4fdba0a1d5db0 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -600,6 +600,7 @@ setup_arch(char **cmdline_p)
        init_mm.brk = (unsigned long) &_end;
 
        parse_cmdline_early(cmdline_p);
+       parse_early_param();
 
        setup_memory();
        setup_resources();
@@ -607,6 +608,7 @@ setup_arch(char **cmdline_p)
 
         cpu_init();
         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
+       smp_setup_cpu_possible_map();
 
        /*
         * Create kernel page tables and switch to virtual addressing.

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 0d1ad5dbe2b16ac035f8c4c3feb53593e09c041d..53291e94ac7be03fc316aa70eaf32b3485d550c5 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -1,8 +1,7 @@
 /*
  *  arch/s390/kernel/smp.c
  *
- *  S390 version
- *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Copyright (C) IBM Corp. 1999,2006
  *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
  *               Heiko Carstens (heiko.carstens@de.ibm.com)
@@ -41,8 +40,6 @@
 #include <asm/cpcmd.h>
 #include <asm/tlbflush.h>
 
-/* prototypes */
-
 extern volatile int __cpu_logical_map[];
 
 /*
@@ -51,13 +48,11 @@ extern volatile int __cpu_logical_map[];
 
 struct _lowcore *lowcore_ptr[NR_CPUS];
 
-cpumask_t cpu_online_map;
-cpumask_t cpu_possible_map = CPU_MASK_ALL;
+cpumask_t cpu_online_map = CPU_MASK_NONE;
+cpumask_t cpu_possible_map = CPU_MASK_NONE;
 
 static struct task_struct *current_set[NR_CPUS];
 
-EXPORT_SYMBOL(cpu_online_map);
-
 /*
  * Reboot, halt and power_off routines for SMP.
  */
@@ -490,10 +485,10 @@ void smp_ctl_clear_bit(int cr, int bit) {
  * Lets check how many CPUs we have.
  */
 
-void
-__init smp_check_cpus(unsigned int max_cpus)
+static unsigned int
+__init smp_count_cpus(void)
 {
-       int cpu, num_cpus;
+       unsigned int cpu, num_cpus;
        __u16 boot_cpu_addr;
 
        /*
@@ -503,19 +498,20 @@ __init smp_check_cpus(unsigned int max_cpus)
        boot_cpu_addr = S390_lowcore.cpu_data.cpu_addr;
        current_thread_info()->cpu = 0;
        num_cpus = 1;
-       for (cpu = 0; cpu <= 65535 && num_cpus < max_cpus; cpu++) {
+       for (cpu = 0; cpu <= 65535; cpu++) {
                if ((__u16) cpu == boot_cpu_addr)
                        continue;
-               __cpu_logical_map[num_cpus] = (__u16) cpu;
-               if (signal_processor(num_cpus, sigp_sense) ==
+               __cpu_logical_map[1] = (__u16) cpu;
+               if (signal_processor(1, sigp_sense) ==
                    sigp_not_operational)
                        continue;
-               cpu_set(num_cpus, cpu_present_map);
                num_cpus++;
        }
 
        printk("Detected %d CPU's\n",(int) num_cpus);
        printk("Boot cpu address %2X\n", boot_cpu_addr);
+
+       return num_cpus;
 }
 
 /*
@@ -676,6 +672,32 @@ __cpu_up(unsigned int cpu)
        return 0;
 }
 
+static unsigned int __initdata additional_cpus;
+
+void __init smp_setup_cpu_possible_map(void)
+{
+       unsigned int pcpus, cpu;
+
+       pcpus = smp_count_cpus() + additional_cpus;
+
+       if (pcpus > NR_CPUS)
+               pcpus = NR_CPUS;
+
+       for (cpu = 0; cpu < pcpus; cpu++)
+               cpu_set(cpu, cpu_possible_map);
+
+       cpu_present_map = cpu_possible_map;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+
+static int __init setup_additional_cpus(char *s)
+{
+       additional_cpus = simple_strtoul(s, NULL, 0);
+       return 0;
+}
+early_param("additional_cpus", setup_additional_cpus);
+
 int
 __cpu_disable(void)
 {
@@ -744,6 +766,8 @@ cpu_die(void)
        for(;;);
 }
 
+#endif /* CONFIG_HOTPLUG_CPU */
+
 /*
  *     Cycle through the processors and setup structures.
  */
@@ -757,7 +781,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         /* request the 0x1201 emergency signal external interrupt */
         if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0)
                 panic("Couldn't request external interrupt 0x1201");
-        smp_check_cpus(max_cpus);
         memset(lowcore_ptr,0,sizeof(lowcore_ptr));  
         /*
          *  Initialize prefix pages and stacks for all possible cpus
@@ -806,14 +829,12 @@ void __devinit smp_prepare_boot_cpu(void)
        BUG_ON(smp_processor_id() != 0);
 
        cpu_set(0, cpu_online_map);
-       cpu_set(0, cpu_present_map);
        S390_lowcore.percpu_offset = __per_cpu_offset[0];
        current_set[0] = current;
 }
 
 void smp_cpus_done(unsigned int max_cpus)
 {
-       cpu_present_map = cpu_possible_map;
 }
 
 /*
@@ -845,6 +866,7 @@ static int __init topology_init(void)
 
 subsys_initcall(topology_init);
 
+EXPORT_SYMBOL(cpu_online_map);
 EXPORT_SYMBOL(cpu_possible_map);
 EXPORT_SYMBOL(lowcore_ptr);
 EXPORT_SYMBOL(smp_ctl_set_bit);

diff --git a/include/asm-s390/smp.h b/include/asm-s390/smp.h
index 9c6e9c300eb9797a54776b60e247df1515d17a37..444dae5912e6b544d9d31c0c45b0fcc53cefe473 100644 (file)
--- a/include/asm-s390/smp.h
+++ b/include/asm-s390/smp.h
@@ -31,6 +31,7 @@ typedef struct
        __u16      cpu;
 } sigp_info;
 
+extern void smp_setup_cpu_possible_map(void);
 extern int smp_call_function_on(void (*func) (void *info), void *info,
                                int nonatomic, int wait, int cpu);
 #define NO_PROC_ID             0xFF            /* No processor magic marker */
@@ -104,6 +105,7 @@ smp_call_function_on(void (*func) (void *info), void *info,
 #define smp_cpu_not_running(cpu)       1
 #define smp_get_cpu(cpu) ({ 0; })
 #define smp_put_cpu(cpu) ({ 0; })
+#define smp_setup_cpu_possible_map()
 #endif
 
 #endif