1 // SPDX-License-Identifier: GPL-2.0-only
3 * HSM extension and cpu_ops implementation.
5 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
8 #include <linux/init.h>
10 #include <asm/cpu_ops.h>
14 extern char secondary_start_sbi[];
15 const struct cpu_operations cpu_ops_sbi;
17 static int sbi_hsm_hart_start(unsigned long hartid, unsigned long saddr,
22 ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_START,
23 hartid, saddr, priv, 0, 0, 0);
25 return sbi_err_map_linux_errno(ret.error);
30 #ifdef CONFIG_HOTPLUG_CPU
31 static int sbi_hsm_hart_stop(void)
35 ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_STOP, 0, 0, 0, 0, 0, 0);
38 return sbi_err_map_linux_errno(ret.error);
43 static int sbi_hsm_hart_get_status(unsigned long hartid)
47 ret = sbi_ecall(SBI_EXT_HSM, SBI_EXT_HSM_HART_STATUS,
48 hartid, 0, 0, 0, 0, 0);
50 return sbi_err_map_linux_errno(ret.error);
56 static int sbi_cpu_start(unsigned int cpuid, struct task_struct *tidle)
59 unsigned long boot_addr = __pa_symbol(secondary_start_sbi);
60 int hartid = cpuid_to_hartid_map(cpuid);
62 cpu_update_secondary_bootdata(cpuid, tidle);
63 rc = sbi_hsm_hart_start(hartid, boot_addr, 0);
68 static int sbi_cpu_prepare(unsigned int cpuid)
70 if (!cpu_ops_sbi.cpu_start) {
71 pr_err("cpu start method not defined for CPU [%d]\n", cpuid);
77 #ifdef CONFIG_HOTPLUG_CPU
78 static int sbi_cpu_disable(unsigned int cpuid)
80 if (!cpu_ops_sbi.cpu_stop)
85 static void sbi_cpu_stop(void)
89 ret = sbi_hsm_hart_stop();
90 pr_crit("Unable to stop the cpu %u (%d)\n", smp_processor_id(), ret);
93 static int sbi_cpu_is_stopped(unsigned int cpuid)
96 int hartid = cpuid_to_hartid_map(cpuid);
98 rc = sbi_hsm_hart_get_status(hartid);
100 if (rc == SBI_HSM_HART_STATUS_STOPPED)
106 const struct cpu_operations cpu_ops_sbi = {
108 .cpu_prepare = sbi_cpu_prepare,
109 .cpu_start = sbi_cpu_start,
110 #ifdef CONFIG_HOTPLUG_CPU
111 .cpu_disable = sbi_cpu_disable,
112 .cpu_stop = sbi_cpu_stop,
113 .cpu_is_stopped = sbi_cpu_is_stopped,