[IA64] Count disabled cpus as potential hot-pluggable CPUs

Have a facility to account for potentially hot-pluggable CPUs. ACPI doesnt
give a determinstic method to find hot-pluggable CPUs. Hence we use 2 methods
to assist.

- BIOS can mark potentially hot-pluggable CPUs as disabled in the MADT tables.
- User can specify the number of hot-pluggable CPUs via parameter
  additional_cpus=X

The option is enabled only if ACPI_CONFIG_HOTPLUG_CPU=y which enables the
physical hotplug option. Without which user can still use logical onlining
and offlining of CPUs by enabling CONFIG_HOTPLUG_CPU=y

Adds more bits to cpu_possible_map for potentially hot-pluggable cpus.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index d2702c4..34795ed 100644 (file)
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -761,6 +761,62 @@ int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
        return (0);
 }
 
+int additional_cpus __initdata = -1;
+
+static __init int setup_additional_cpus(char *s)
+{
+       if (s)
+               additional_cpus = simple_strtol(s, NULL, 0);
+
+       return 0;
+}
+
+early_param("additional_cpus", setup_additional_cpus);
+
+/*
+ * cpu_possible_map should be static, it cannot change as cpu's
+ * are onlined, or offlined. The reason is per-cpu data-structures
+ * are allocated by some modules at init time, and dont expect to
+ * do this dynamically on cpu arrival/departure.
+ * cpu_present_map on the other hand can change dynamically.
+ * In case when cpu_hotplug is not compiled, then we resort to current
+ * behaviour, which is cpu_possible == cpu_present.
+ * - Ashok Raj
+ *
+ * Three ways to find out the number of additional hotplug CPUs:
+ * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
+ * - The user can overwrite it with additional_cpus=NUM
+ * - Otherwise don't reserve additional CPUs.
+ */
+__init void prefill_possible_map(void)
+{
+       int i;
+       int possible, disabled_cpus;
+
+       disabled_cpus = total_cpus - available_cpus;
+       if (additional_cpus == -1) {
+               if (disabled_cpus > 0) {
+                       possible = total_cpus;
+                       additional_cpus = disabled_cpus;
+               }
+               else {
+                       possible = available_cpus;
+                       additional_cpus = 0;
+               }
+       } else {
+               possible = available_cpus + additional_cpus;
+       }
+       if (possible > NR_CPUS)
+               possible = NR_CPUS;
+
+       printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
+               possible,
+               max_t(int, additional_cpus, 0));
+
+       for (i = 0; i < possible; i++)
+               cpu_set(i, cpu_possible_map);
+}
+
 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
 {
        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 35f7835..3258e09 100644 (file)
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -430,6 +430,7 @@ setup_arch (char **cmdline_p)
        if (early_console_setup(*cmdline_p) == 0)
                mark_bsp_online();
 
+       parse_early_param();
 #ifdef CONFIG_ACPI
        /* Initialize the ACPI boot-time table parser */
        acpi_table_init();
@@ -688,6 +689,9 @@ void
 setup_per_cpu_areas (void)
 {
        /* start_kernel() requires this... */
+#ifdef CONFIG_ACPI_HOTPLUG_CPU
+       prefill_possible_map();
+#endif
 }
 
 /*

diff --git a/include/asm-ia64/acpi.h b/include/asm-ia64/acpi.h
index 3a544ff..f7a5176 100644 (file)
--- a/include/asm-ia64/acpi.h
+++ b/include/asm-ia64/acpi.h
@@ -106,6 +106,8 @@ extern unsigned int can_cpei_retarget(void);
 extern unsigned int is_cpu_cpei_target(unsigned int cpu);
 extern void set_cpei_target_cpu(unsigned int cpu);
 extern unsigned int get_cpei_target_cpu(void);
+extern void prefill_possible_map(void);
+extern int additional_cpus;
 
 #ifdef CONFIG_ACPI_NUMA
 /* Proximity bitmap length; _PXM is at most 255 (8 bit)*/