1 // SPDX-License-Identifier: GPL-2.0
3  *	linux/arch/alpha/kernel/smp.c
5  *      2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
22 #include <linux/smp.h>
53 /* A collection of per-processor data.  */
77  *  per-processor storage.
89  * Ideally sets up per-cpu profiling hooks.  Doesn't do much now...
141 	/* Call platform-specific callin, if specified */  in smp_callin()
147 	current->active_mm = &init_mm;  in smp_callin()
167 	      cpuid, current, current->active_mm));  in smp_callin()
172 /* Wait until hwrpb->txrdy is clear for cpu.  Return -1 on timeout.  */
178 	if (!(hwrpb->txrdy & cpumask))  in wait_for_txrdy()
183 		if (!(hwrpb->txrdy & cpumask))  in wait_for_txrdy()
189 	return -1;  in wait_for_txrdy()
194  * interesting message.  ;-)
206 		 + hwrpb->processor_offset  in send_secondary_console_msg()
207 		 + cpuid * hwrpb->processor_size);  in send_secondary_console_msg()
215 	*(unsigned int *)&cpu->ipc_buffer[0] = len;  in send_secondary_console_msg()
216 	cp1 = (char *) &cpu->ipc_buffer[1];  in send_secondary_console_msg()
221 	set_bit(cpuid, &hwrpb->rxrdy);  in send_secondary_console_msg()
238 	unsigned long txrdy = hwrpb->txrdy;  in recv_secondary_console_msg()
255 		   + hwrpb->processor_offset  in recv_secondary_console_msg()
256 		   + i * hwrpb->processor_size);  in recv_secondary_console_msg()
260 		      mycpu, i, cpu->halt_reason, cpu->flags));  in recv_secondary_console_msg()
262 		cnt = cpu->ipc_buffer[0] >> 32;  in recv_secondary_console_msg()
266 			cp1 = (char *) &cpu->ipc_buffer[1];  in recv_secondary_console_msg()
282 	hwrpb->txrdy = 0;  in recv_secondary_console_msg()
297 		 + hwrpb->processor_offset  in secondary_cpu_start()
298 		 + cpuid * hwrpb->processor_size);  in secondary_cpu_start()
299 	hwpcb = (struct pcb_struct *) cpu->hwpcb;  in secondary_cpu_start()
300 	ipcb = &task_thread_info(idle)->pcb;  in secondary_cpu_start()
306 	hwpcb->ksp = (unsigned long)ipcb + sizeof(union thread_union) - 16;  in secondary_cpu_start()
307 	hwpcb->usp = 0;  in secondary_cpu_start()
308 	hwpcb->ptbr = ipcb->ptbr;  in secondary_cpu_start()
309 	hwpcb->pcc = 0;  in secondary_cpu_start()
310 	hwpcb->asn = 0;  in secondary_cpu_start()
311 	hwpcb->unique = virt_to_phys(ipcb);  in secondary_cpu_start()
312 	hwpcb->flags = ipcb->flags;  in secondary_cpu_start()
313 	hwpcb->res1 = hwpcb->res2 = 0;  in secondary_cpu_start()
317 	      hwpcb->ksp, hwpcb->ptbr, hwrpb->vptb, hwpcb->unique));  in secondary_cpu_start()
320 	      cpuid, idle->state, ipcb->flags));  in secondary_cpu_start()
323 	hwrpb->CPU_restart = __smp_callin;  in secondary_cpu_start()
324 	hwrpb->CPU_restart_data = (unsigned long) __smp_callin;  in secondary_cpu_start()
334 	cpu->flags |= 0x22;	/* turn on Context Valid and Restart Capable */  in secondary_cpu_start()
335 	cpu->flags &= ~1;	/* turn off Bootstrap In Progress */  in secondary_cpu_start()
343 		if (cpu->flags & 1)  in secondary_cpu_start()
348 	printk(KERN_ERR "SMP: Processor %d failed to start.\n", cpuid);  in secondary_cpu_start()
349 	return -1;  in secondary_cpu_start()
365 	smp_secondary_alive = -1;  in smp_boot_one_cpu()
369 		return -1;  in smp_boot_one_cpu()
387 	printk(KERN_ERR "SMP: Processor %d is stuck.\n", cpuid);  in smp_boot_one_cpu()
388 	return -1;  in smp_boot_one_cpu()
396  * Called from setup_arch.  Detect an SMP system and which processors
406 		printk(KERN_WARNING "SMP: Booting off cpu %d instead of 0?\n",  in setup_smp()
410 	if (hwrpb->nr_processors > 1) {  in setup_smp()
414 		      hwrpb->nr_processors));  in setup_smp()
417 			((char*)hwrpb + hwrpb->processor_offset);  in setup_smp()
418 		boot_cpu_palrev = cpubase->pal_revision;  in setup_smp()
420 		for (i = 0; i < hwrpb->nr_processors; i++) {  in setup_smp()
422 				((char *)cpubase + i*hwrpb->processor_size);  in setup_smp()
423 			if ((cpu->flags & 0x1cc) == 0x1cc) {  in setup_smp()
427 				cpu->pal_revision = boot_cpu_palrev;  in setup_smp()
431 			      i, cpu->flags, cpu->type));  in setup_smp()
433 			      i, cpu->pal_revision));  in setup_smp()
439 	printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n",  in setup_smp()
452 	current_thread_info()->cpu = boot_cpuid;  in smp_prepare_cpus()
461 		printk(KERN_INFO "SMP mode deactivated.\n");  in smp_prepare_cpus()
465 	printk(KERN_INFO "SMP starting up secondaries.\n");  in smp_prepare_cpus()
480 	return cpu_online(cpu) ? 0 : -ENOSYS;  in __cpu_up()
493 	printk(KERN_INFO "SMP: Total of %d processors activated "  in smp_cpus_done()
523 	      this_cpu, *pending_ipis, regs->pc));  in handle_ipi()
532 		which = ops & -ops;  in handle_ipi()
560 	if (hwrpb->txrdy)  in handle_ipi()
632 	if (mm == current->active_mm && !asn_locked())  in ipi_flush_tlb_mm()
643 	if (mm == current->active_mm) {  in flush_tlb_mm()
645 		if (atomic_read(&mm->mm_users) <= 1) {  in flush_tlb_mm()
650 				if (mm->context[cpu])  in flush_tlb_mm()
651 					mm->context[cpu] = 0;  in flush_tlb_mm()
674 	struct mm_struct * mm = data->mm;  in ipi_flush_tlb_page()
676 	if (mm == current->active_mm && !asn_locked())  in ipi_flush_tlb_page()
677 		flush_tlb_current_page(mm, data->vma, data->addr);  in ipi_flush_tlb_page()
686 	struct mm_struct *mm = vma->vm_mm;  in flush_tlb_page()
690 	if (mm == current->active_mm) {  in flush_tlb_page()
692 		if (atomic_read(&mm->mm_users) <= 1) {  in flush_tlb_page()
697 				if (mm->context[cpu])  in flush_tlb_page()
698 					mm->context[cpu] = 0;  in flush_tlb_page()
719 	flush_tlb_mm(vma->vm_mm);  in flush_tlb_range()
727 	if (mm == current->active_mm && !asn_locked())  in ipi_flush_icache_page()
737 	struct mm_struct *mm = vma->vm_mm;  in flush_icache_user_page()
739 	if ((vma->vm_flags & VM_EXEC) == 0)  in flush_icache_user_page()
744 	if (mm == current->active_mm) {  in flush_icache_user_page()
746 		if (atomic_read(&mm->mm_users) <= 1) {  in flush_icache_user_page()
751 				if (mm->context[cpu])  in flush_icache_user_page()
752 					mm->context[cpu] = 0;  in flush_icache_user_page()