1 files changed, 115 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/cputhreads.h b/arch/powerpc/include/asm/cputhreads.h
new file mode 100644
index 000000000..f26c430f3
--- /dev/null
+++ b/arch/powerpc/include/asm/cputhreads.h
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_CPUTHREADS_H
+#define _ASM_POWERPC_CPUTHREADS_H
+
+#ifndef __ASSEMBLY__
+#include <linux/cpumask.h>
+#include <asm/cpu_has_feature.h>
+
+/*
+ * Mapping of threads to cores
+ *
+ * Note: This implementation is limited to a power of 2 number of
+ * threads per core and the same number for each core in the system
+ * (though it would work if some processors had less threads as long
+ * as the CPU numbers are still allocated, just not brought online).
+ *
+ * However, the API allows for a different implementation in the future
+ * if needed, as long as you only use the functions and not the variables
+ * directly.
+ */
+
+#ifdef CONFIG_SMP
+extern int threads_per_core;
+extern int threads_per_subcore;
+extern int threads_shift;
+extern cpumask_t threads_core_mask;
+#else
+#define threads_per_core	1
+#define threads_per_subcore	1
+#define threads_shift		0
+#define has_big_cores		0
+#define threads_core_mask	(*get_cpu_mask(0))
+#endif
+
+static inline int cpu_nr_cores(void)
+{
+	return nr_cpu_ids >> threads_shift;
+}
+
+#ifdef CONFIG_SMP
+int cpu_core_index_of_thread(int cpu);
+int cpu_first_thread_of_core(int core);
+#else
+static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
+static inline int cpu_first_thread_of_core(int core) { return core; }
+#endif
+
+static inline int cpu_thread_in_core(int cpu)
+{
+	return cpu & (threads_per_core - 1);
+}
+
+static inline int cpu_thread_in_subcore(int cpu)
+{
+	return cpu & (threads_per_subcore - 1);
+}
+
+static inline int cpu_first_thread_sibling(int cpu)
+{
+	return cpu & ~(threads_per_core - 1);
+}
+
+static inline int cpu_last_thread_sibling(int cpu)
+{
+	return cpu | (threads_per_core - 1);
+}
+
+/*
+ * tlb_thread_siblings are siblings which share a TLB. This is not
+ * architected, is not something a hypervisor could emulate and a future
+ * CPU may change behaviour even in compat mode, so this should only be
+ * used on PowerNV, and only with care.
+ */
+static inline int cpu_first_tlb_thread_sibling(int cpu)
+{
+	if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
+		return cpu & ~0x6;	/* Big Core */
+	else
+		return cpu_first_thread_sibling(cpu);
+}
+
+static inline int cpu_last_tlb_thread_sibling(int cpu)
+{
+	if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
+		return cpu | 0x6;	/* Big Core */
+	else
+		return cpu_last_thread_sibling(cpu);
+}
+
+static inline int cpu_tlb_thread_sibling_step(void)
+{
+	if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
+		return 2;		/* Big Core */
+	else
+		return 1;
+}
+
+static inline u32 get_tensr(void)
+{
+#ifdef	CONFIG_BOOKE
+	if (cpu_has_feature(CPU_FTR_SMT))
+		return mfspr(SPRN_TENSR);
+#endif
+	return 1;
+}
+
+void book3e_start_thread(int thread, unsigned long addr);
+void book3e_stop_thread(int thread);
+
+#endif /* __ASSEMBLY__ */
+
+#define INVALID_THREAD_HWID	0x0fff
+
+#endif /* _ASM_POWERPC_CPUTHREADS_H */
+