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Linux/arch/csky/kernel/smp.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 
  3 #include <linux/module.h>
  4 #include <linux/init.h>
  5 #include <linux/kernel.h>
  6 #include <linux/mm.h>
  7 #include <linux/sched.h>
  8 #include <linux/kernel_stat.h>
  9 #include <linux/notifier.h>
 10 #include <linux/cpu.h>
 11 #include <linux/percpu.h>
 12 #include <linux/delay.h>
 13 #include <linux/err.h>
 14 #include <linux/irq.h>
 15 #include <linux/irqdomain.h>
 16 #include <linux/of.h>
 17 #include <linux/sched/task_stack.h>
 18 #include <linux/sched/mm.h>
 19 #include <linux/sched/hotplug.h>
 20 #include <asm/irq.h>
 21 #include <asm/traps.h>
 22 #include <asm/sections.h>
 23 #include <asm/mmu_context.h>
 24 #include <asm/pgalloc.h>
 25 #ifdef CONFIG_CPU_HAS_FPU
 26 #include <abi/fpu.h>
 27 #endif
 28 
 29 struct ipi_data_struct {
 30         unsigned long bits ____cacheline_aligned;
 31 };
 32 static DEFINE_PER_CPU(struct ipi_data_struct, ipi_data);
 33 
 34 enum ipi_message_type {
 35         IPI_EMPTY,
 36         IPI_RESCHEDULE,
 37         IPI_CALL_FUNC,
 38         IPI_MAX
 39 };
 40 
 41 static irqreturn_t handle_ipi(int irq, void *dev)
 42 {
 43         while (true) {
 44                 unsigned long ops;
 45 
 46                 ops = xchg(&this_cpu_ptr(&ipi_data)->bits, 0);
 47                 if (ops == 0)
 48                         return IRQ_HANDLED;
 49 
 50                 if (ops & (1 << IPI_RESCHEDULE))
 51                         scheduler_ipi();
 52 
 53                 if (ops & (1 << IPI_CALL_FUNC))
 54                         generic_smp_call_function_interrupt();
 55 
 56                 BUG_ON((ops >> IPI_MAX) != 0);
 57         }
 58 
 59         return IRQ_HANDLED;
 60 }
 61 
 62 static void (*send_arch_ipi)(const struct cpumask *mask);
 63 
 64 static int ipi_irq;
 65 void __init set_send_ipi(void (*func)(const struct cpumask *mask), int irq)
 66 {
 67         if (send_arch_ipi)
 68                 return;
 69 
 70         send_arch_ipi = func;
 71         ipi_irq = irq;
 72 }
 73 
 74 static void
 75 send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
 76 {
 77         int i;
 78 
 79         for_each_cpu(i, to_whom)
 80                 set_bit(operation, &per_cpu_ptr(&ipi_data, i)->bits);
 81 
 82         smp_mb();
 83         send_arch_ipi(to_whom);
 84 }
 85 
 86 void arch_send_call_function_ipi_mask(struct cpumask *mask)
 87 {
 88         send_ipi_message(mask, IPI_CALL_FUNC);
 89 }
 90 
 91 void arch_send_call_function_single_ipi(int cpu)
 92 {
 93         send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
 94 }
 95 
 96 static void ipi_stop(void *unused)
 97 {
 98         while (1);
 99 }
100 
101 void smp_send_stop(void)
102 {
103         on_each_cpu(ipi_stop, NULL, 1);
104 }
105 
106 void smp_send_reschedule(int cpu)
107 {
108         send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
109 }
110 
111 void __init smp_prepare_boot_cpu(void)
112 {
113 }
114 
115 void __init smp_prepare_cpus(unsigned int max_cpus)
116 {
117 }
118 
119 static int ipi_dummy_dev;
120 
121 void __init setup_smp_ipi(void)
122 {
123         int rc;
124 
125         if (ipi_irq == 0)
126                 return;
127 
128         rc = request_percpu_irq(ipi_irq, handle_ipi, "IPI Interrupt",
129                                 &ipi_dummy_dev);
130         if (rc)
131                 panic("%s IRQ request failed\n", __func__);
132 
133         enable_percpu_irq(ipi_irq, 0);
134 }
135 
136 void __init setup_smp(void)
137 {
138         struct device_node *node = NULL;
139         int cpu;
140 
141         for_each_of_cpu_node(node) {
142                 if (!of_device_is_available(node))
143                         continue;
144 
145                 if (of_property_read_u32(node, "reg", &cpu))
146                         continue;
147 
148                 if (cpu >= NR_CPUS)
149                         continue;
150 
151                 set_cpu_possible(cpu, true);
152                 set_cpu_present(cpu, true);
153         }
154 }
155 
156 extern void _start_smp_secondary(void);
157 
158 volatile unsigned int secondary_hint;
159 volatile unsigned int secondary_ccr;
160 volatile unsigned int secondary_stack;
161 
162 unsigned long secondary_msa1;
163 
164 int __cpu_up(unsigned int cpu, struct task_struct *tidle)
165 {
166         unsigned long mask = 1 << cpu;
167 
168         secondary_stack =
169                 (unsigned int) task_stack_page(tidle) + THREAD_SIZE - 8;
170         secondary_hint = mfcr("cr31");
171         secondary_ccr  = mfcr("cr18");
172         secondary_msa1 = read_mmu_msa1();
173 
174         /*
175          * Because other CPUs are in reset status, we must flush data
176          * from cache to out and secondary CPUs use them in
177          * csky_start_secondary(void)
178          */
179         mtcr("cr17", 0x22);
180 
181         if (mask & mfcr("cr<29, 0>")) {
182                 send_arch_ipi(cpumask_of(cpu));
183         } else {
184                 /* Enable cpu in SMP reset ctrl reg */
185                 mask |= mfcr("cr<29, 0>");
186                 mtcr("cr<29, 0>", mask);
187         }
188 
189         /* Wait for the cpu online */
190         while (!cpu_online(cpu));
191 
192         secondary_stack = 0;
193 
194         return 0;
195 }
196 
197 void __init smp_cpus_done(unsigned int max_cpus)
198 {
199 }
200 
201 int setup_profiling_timer(unsigned int multiplier)
202 {
203         return -EINVAL;
204 }
205 
206 void csky_start_secondary(void)
207 {
208         struct mm_struct *mm = &init_mm;
209         unsigned int cpu = smp_processor_id();
210 
211         mtcr("cr31", secondary_hint);
212         mtcr("cr18", secondary_ccr);
213 
214         mtcr("vbr", vec_base);
215 
216         flush_tlb_all();
217         write_mmu_pagemask(0);
218         TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
219         TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
220 
221 #ifdef CONFIG_CPU_HAS_FPU
222         init_fpu();
223 #endif
224 
225         enable_percpu_irq(ipi_irq, 0);
226 
227         mmget(mm);
228         mmgrab(mm);
229         current->active_mm = mm;
230         cpumask_set_cpu(cpu, mm_cpumask(mm));
231 
232         notify_cpu_starting(cpu);
233         set_cpu_online(cpu, true);
234 
235         pr_info("CPU%u Online: %s...\n", cpu, __func__);
236 
237         local_irq_enable();
238         preempt_disable();
239         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
240 }
241 
242 #ifdef CONFIG_HOTPLUG_CPU
243 int __cpu_disable(void)
244 {
245         unsigned int cpu = smp_processor_id();
246 
247         set_cpu_online(cpu, false);
248 
249         irq_migrate_all_off_this_cpu();
250 
251         clear_tasks_mm_cpumask(cpu);
252 
253         return 0;
254 }
255 
256 void __cpu_die(unsigned int cpu)
257 {
258         if (!cpu_wait_death(cpu, 5)) {
259                 pr_crit("CPU%u: shutdown failed\n", cpu);
260                 return;
261         }
262         pr_notice("CPU%u: shutdown\n", cpu);
263 }
264 
265 void arch_cpu_idle_dead(void)
266 {
267         idle_task_exit();
268 
269         cpu_report_death();
270 
271         while (!secondary_stack)
272                 arch_cpu_idle();
273 
274         local_irq_disable();
275 
276         asm volatile(
277                 "mov    sp, %0\n"
278                 "mov    r8, %0\n"
279                 "jmpi   csky_start_secondary"
280                 :
281                 : "r" (secondary_stack));
282 }
283 #endif
284 

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