From 9999e48639b3cecb08ffb37358bcba3b48161b29 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 08:50:17 +0000
Subject: [PATCH] add ax88772_rst
---
kernel/arch/riscv/include/asm/smp.h | 106 +++++++++++++++++++++++++++++++++++++++++++---------
1 files changed, 87 insertions(+), 19 deletions(-)
diff --git a/kernel/arch/riscv/include/asm/smp.h b/kernel/arch/riscv/include/asm/smp.h
index 3601684..df1f7c4 100644
--- a/kernel/arch/riscv/include/asm/smp.h
+++ b/kernel/arch/riscv/include/asm/smp.h
@@ -1,31 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 Regents of the University of California
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#ifndef _ASM_RISCV_SMP_H
#define _ASM_RISCV_SMP_H
-/* This both needs asm-offsets.h and is used when generating it. */
-#ifndef GENERATING_ASM_OFFSETS
-#include <asm/asm-offsets.h>
-#endif
-
#include <linux/cpumask.h>
#include <linux/irqreturn.h>
+#include <linux/thread_info.h>
+
+#define INVALID_HARTID ULONG_MAX
+
+struct seq_file;
+extern unsigned long boot_cpu_hartid;
+
+struct riscv_ipi_ops {
+ void (*ipi_inject)(const struct cpumask *target);
+ void (*ipi_clear)(void);
+};
#ifdef CONFIG_SMP
+/*
+ * Mapping between linux logical cpu index and hartid.
+ */
+extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
+#define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu]
+
+/* print IPI stats */
+void show_ipi_stats(struct seq_file *p, int prec);
/* SMP initialization hook for setup_arch */
void __init setup_smp(void);
+
+/* Called from C code, this handles an IPI. */
+void handle_IPI(struct pt_regs *regs);
/* Hook for the generic smp_call_function_many() routine. */
void arch_send_call_function_ipi_mask(struct cpumask *mask);
@@ -33,14 +42,73 @@
/* Hook for the generic smp_call_function_single() routine. */
void arch_send_call_function_single_ipi(int cpu);
+int riscv_hartid_to_cpuid(int hartid);
+void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
+
+/* Set custom IPI operations */
+void riscv_set_ipi_ops(struct riscv_ipi_ops *ops);
+
+/* Clear IPI for current CPU */
+void riscv_clear_ipi(void);
+
+/* Secondary hart entry */
+asmlinkage void smp_callin(void);
+
/*
- * This is particularly ugly: it appears we can't actually get the definition
- * of task_struct here, but we need access to the CPU this task is running on.
- * Instead of using C we're using asm-offsets.h to get the current processor
- * ID.
+ * Obtains the hart ID of the currently executing task. This relies on
+ * THREAD_INFO_IN_TASK, but we define that unconditionally.
*/
-#define raw_smp_processor_id() (*((int*)((char*)get_current() + TASK_TI_CPU)))
+#define raw_smp_processor_id() (current_thread_info()->cpu)
+
+#if defined CONFIG_HOTPLUG_CPU
+int __cpu_disable(void);
+void __cpu_die(unsigned int cpu);
+void cpu_stop(void);
+#else
+#endif /* CONFIG_HOTPLUG_CPU */
+
+#else
+
+static inline void show_ipi_stats(struct seq_file *p, int prec)
+{
+}
+
+static inline int riscv_hartid_to_cpuid(int hartid)
+{
+ if (hartid == boot_cpu_hartid)
+ return 0;
+
+ return -1;
+}
+static inline unsigned long cpuid_to_hartid_map(int cpu)
+{
+ return boot_cpu_hartid;
+}
+
+static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in,
+ struct cpumask *out)
+{
+ cpumask_clear(out);
+ cpumask_set_cpu(boot_cpu_hartid, out);
+}
+
+static inline void riscv_set_ipi_ops(struct riscv_ipi_ops *ops)
+{
+}
+
+static inline void riscv_clear_ipi(void)
+{
+}
#endif /* CONFIG_SMP */
+#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
+bool cpu_has_hotplug(unsigned int cpu);
+#else
+static inline bool cpu_has_hotplug(unsigned int cpu)
+{
+ return false;
+}
+#endif
+
#endif /* _ASM_RISCV_SMP_H */
--
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