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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-s390/smp.h
downloadop-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-s390/smp.h')
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1 files changed, 108 insertions, 0 deletions
diff --git a/include/asm-s390/smp.h b/include/asm-s390/smp.h
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+/*
+ * include/asm-s390/smp.h
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * 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)
+ */
+#ifndef __ASM_SMP_H
+#define __ASM_SMP_H
+
+#include <linux/config.h>
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/bitops.h>
+
+#if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)
+
+#include <asm/lowcore.h>
+#include <asm/sigp.h>
+
+/*
+ s390 specific smp.c headers
+ */
+typedef struct
+{
+ int intresting;
+ sigp_ccode ccode;
+ __u32 status;
+ __u16 cpu;
+} sigp_info;
+
+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 */
+
+/*
+ * This magic constant controls our willingness to transfer
+ * a process across CPUs. Such a transfer incurs misses on the L1
+ * cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
+ * gut feeling is this will vary by board in value. For a board
+ * with separate L2 cache it probably depends also on the RSS, and
+ * for a board with shared L2 cache it ought to decay fast as other
+ * processes are run.
+ */
+
+#define PROC_CHANGE_PENALTY 20 /* Schedule penalty */
+
+#define smp_processor_id() (S390_lowcore.cpu_data.cpu_nr)
+
+extern int smp_get_cpu(cpumask_t cpu_map);
+extern void smp_put_cpu(int cpu);
+
+extern __inline__ __u16 hard_smp_processor_id(void)
+{
+ __u16 cpu_address;
+
+ __asm__ ("stap %0\n" : "=m" (cpu_address));
+ return cpu_address;
+}
+
+/*
+ * returns 1 if cpu is in stopped/check stopped state or not operational
+ * returns 0 otherwise
+ */
+static inline int
+smp_cpu_not_running(int cpu)
+{
+ __u32 status;
+
+ switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) {
+ case sigp_order_code_accepted:
+ case sigp_status_stored:
+ /* Check for stopped and check stop state */
+ if (status & 0x50)
+ return 1;
+ break;
+ case sigp_not_operational:
+ return 1;
+ default:
+ break;
+ }
+ return 0;
+}
+
+#define cpu_logical_map(cpu) (cpu)
+
+extern int __cpu_disable (void);
+extern void __cpu_die (unsigned int cpu);
+extern void cpu_die (void) __attribute__ ((noreturn));
+extern int __cpu_up (unsigned int cpu);
+
+#endif
+
+#ifndef CONFIG_SMP
+static inline int
+smp_call_function_on(void (*func) (void *info), void *info,
+ int nonatomic, int wait, int cpu)
+{
+ func(info);
+ return 0;
+}
+#define smp_get_cpu(cpu) ({ 0; })
+#define smp_put_cpu(cpu) ({ 0; })
+#endif
+
+#endif
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