arch/mips/cavium-octeon/smp.c - kernel/msm-5.4 - Gitiles

 /*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
  * Copyright (C) 2004-2008, 2009, 2010 Cavium Networks
  */
 #include <linux/cpu.h>
 #include <linux/delay.h>
 #include <linux/smp.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 #include <linux/sched.h>
 #include <linux/sched/hotplug.h>
 #include <linux/sched/task_stack.h>
 #include <linux/init.h>
 #include <linux/export.h>

 #include <asm/mmu_context.h>
 #include <asm/time.h>
 #include <asm/setup.h>

 #include <asm/octeon/octeon.h>

 #include "octeon_boot.h"

 volatile unsigned long octeon_processor_boot = 0xff;
 volatile unsigned long octeon_processor_sp;
 volatile unsigned long octeon_processor_gp;
 #ifdef CONFIG_RELOCATABLE
 volatile unsigned long octeon_processor_relocated_kernel_entry;
 #endif /* CONFIG_RELOCATABLE */

 #ifdef CONFIG_HOTPLUG_CPU
 uint64_t octeon_bootloader_entry_addr;
 EXPORT_SYMBOL(octeon_bootloader_entry_addr);
 #endif

 extern void kernel_entry(unsigned long arg1, ...);

 static void octeon_icache_flush(void)
 {
 	asm volatile ("synci 0($0)\n");
 }

 static void (*octeon_message_functions[8])(void) = {
 	scheduler_ipi,
 	generic_smp_call_function_interrupt,
 	octeon_icache_flush,
 };

 static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
 {
 	u64 mbox_clrx = CVMX_CIU_MBOX_CLRX(cvmx_get_core_num());
 	u64 action;
 	int i;

 	/*
 	 * Make sure the function array initialization remains
 	 * correct.
 	 */
 	BUILD_BUG_ON(SMP_RESCHEDULE_YOURSELF != (1 << 0));
 	BUILD_BUG_ON(SMP_CALL_FUNCTION       != (1 << 1));
 	BUILD_BUG_ON(SMP_ICACHE_FLUSH        != (1 << 2));

 	/*
 	 * Load the mailbox register to figure out what we're supposed
 	 * to do.
 	 */
 	action = cvmx_read_csr(mbox_clrx);

 	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
 		action &= 0xff;
 	else
 		action &= 0xffff;

 	/* Clear the mailbox to clear the interrupt */
 	cvmx_write_csr(mbox_clrx, action);

 	for (i = 0; i < ARRAY_SIZE(octeon_message_functions) && action;) {
 		if (action & 1) {
 			void (*fn)(void) = octeon_message_functions[i];

 			if (fn)
 				fn();
 		}
 		action >>= 1;
 		i++;
 	}
 	return IRQ_HANDLED;
 }

 /**
  * Cause the function described by call_data to be executed on the passed
  * cpu.	 When the function has finished, increment the finished field of
  * call_data.
  */
 void octeon_send_ipi_single(int cpu, unsigned int action)
 {
 	int coreid = cpu_logical_map(cpu);
 	/*
 	pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
 	       coreid, action);
 	*/
 	cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
 }

 static inline void octeon_send_ipi_mask(const struct cpumask *mask,
 					unsigned int action)
 {
 	unsigned int i;

 	for_each_cpu(i, mask)
 		octeon_send_ipi_single(i, action);
 }

 /**
  * Detect available CPUs, populate cpu_possible_mask
  */
 static void octeon_smp_hotplug_setup(void)
 {
 #ifdef CONFIG_HOTPLUG_CPU
 	struct linux_app_boot_info *labi;

 	if (!setup_max_cpus)
 		return;

 	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
 	if (labi->labi_signature != LABI_SIGNATURE) {
 		pr_info("The bootloader on this board does not support HOTPLUG_CPU.");
 		return;
 	}

 	octeon_bootloader_entry_addr = labi->InitTLBStart_addr;
 #endif
 }

 static void __init octeon_smp_setup(void)
 {
 	const int coreid = cvmx_get_core_num();
 	int cpus;
 	int id;
 	struct cvmx_sysinfo *sysinfo = cvmx_sysinfo_get();

 #ifdef CONFIG_HOTPLUG_CPU
 	int core_mask = octeon_get_boot_coremask();
 	unsigned int num_cores = cvmx_octeon_num_cores();
 #endif

 	/* The present CPUs are initially just the boot cpu (CPU 0). */
 	for (id = 0; id < NR_CPUS; id++) {
 		set_cpu_possible(id, id == 0);
 		set_cpu_present(id, id == 0);
 	}

 	__cpu_number_map[coreid] = 0;
 	__cpu_logical_map[0] = coreid;

 	/* The present CPUs get the lowest CPU numbers. */
 	cpus = 1;
 	for (id = 0; id < NR_CPUS; id++) {
 		if ((id != coreid) && cvmx_coremask_is_core_set(&sysinfo->core_mask, id)) {
 			set_cpu_possible(cpus, true);
 			set_cpu_present(cpus, true);
 			__cpu_number_map[id] = cpus;
 			__cpu_logical_map[cpus] = id;
 			cpus++;
 		}
 	}

 #ifdef CONFIG_HOTPLUG_CPU
 	/*
 	 * The possible CPUs are all those present on the chip.	 We
 	 * will assign CPU numbers for possible cores as well.	Cores
 	 * are always consecutively numberd from 0.
 	 */
 	for (id = 0; setup_max_cpus && octeon_bootloader_entry_addr &&
 		     id < num_cores && id < NR_CPUS; id++) {
 		if (!(core_mask & (1 << id))) {
 			set_cpu_possible(cpus, true);
 			__cpu_number_map[id] = cpus;
 			__cpu_logical_map[cpus] = id;
 			cpus++;
 		}
 	}
 #endif

 	octeon_smp_hotplug_setup();
 }


 #ifdef CONFIG_RELOCATABLE
 int plat_post_relocation(long offset)
 {
 	unsigned long entry = (unsigned long)kernel_entry;

 	/* Send secondaries into relocated kernel */
 	octeon_processor_relocated_kernel_entry = entry + offset;

 	return 0;
 }
 #endif /* CONFIG_RELOCATABLE */

 /**
  * Firmware CPU startup hook
  *
  */
 static void octeon_boot_secondary(int cpu, struct task_struct *idle)
 {
 	int count;

 	pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
 		cpu_logical_map(cpu));

 	octeon_processor_sp = __KSTK_TOS(idle);
 	octeon_processor_gp = (unsigned long)(task_thread_info(idle));
 	octeon_processor_boot = cpu_logical_map(cpu);
 	mb();

 	count = 10000;
 	while (octeon_processor_sp && count) {
 		/* Waiting for processor to get the SP and GP */
 		udelay(1);
 		count--;
 	}
 	if (count == 0)
 		pr_err("Secondary boot timeout\n");
 }

 /**
  * After we've done initial boot, this function is called to allow the
  * board code to clean up state, if needed
  */
 static void octeon_init_secondary(void)
 {
 	unsigned int sr;

 	sr = set_c0_status(ST0_BEV);
 	write_c0_ebase((u32)ebase);
 	write_c0_status(sr);

 	octeon_check_cpu_bist();
 	octeon_init_cvmcount();

 	octeon_irq_setup_secondary();
 }

 /**
  * Callout to firmware before smp_init
  *
  */
 static void __init octeon_prepare_cpus(unsigned int max_cpus)
 {
 	/*
 	 * Only the low order mailbox bits are used for IPIs, leave
 	 * the other bits alone.
 	 */
 	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffff);
 	if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt,
 			IRQF_PERCPU | IRQF_NO_THREAD, "SMP-IPI",
 			mailbox_interrupt)) {
 		panic("Cannot request_irq(OCTEON_IRQ_MBOX0)");
 	}
 }

 /**
  * Last chance for the board code to finish SMP initialization before
  * the CPU is "online".
  */
 static void octeon_smp_finish(void)
 {
 	octeon_user_io_init();

 	/* to generate the first CPU timer interrupt */
 	write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
 	local_irq_enable();
 }

 #ifdef CONFIG_HOTPLUG_CPU

 /* State of each CPU. */
 DEFINE_PER_CPU(int, cpu_state);

 static int octeon_cpu_disable(void)
 {
 	unsigned int cpu = smp_processor_id();

 	if (cpu == 0)
 		return -EBUSY;

 	if (!octeon_bootloader_entry_addr)
 		return -ENOTSUPP;

 	set_cpu_online(cpu, false);
 	calculate_cpu_foreign_map();
 	octeon_fixup_irqs();

 	__flush_cache_all();
 	local_flush_tlb_all();

 	return 0;
 }

 static void octeon_cpu_die(unsigned int cpu)
 {
 	int coreid = cpu_logical_map(cpu);
 	uint32_t mask, new_mask;
 	const struct cvmx_bootmem_named_block_desc *block_desc;

 	while (per_cpu(cpu_state, cpu) != CPU_DEAD)
 		cpu_relax();

 	/*
 	 * This is a bit complicated strategics of getting/settig available
 	 * cores mask, copied from bootloader
 	 */

 	mask = 1 << coreid;
 	/* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */
 	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);

 	if (!block_desc) {
 		struct linux_app_boot_info *labi;

 		labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);

 		labi->avail_coremask |= mask;
 		new_mask = labi->avail_coremask;
 	} else {		       /* alternative, already initialized */
 		uint32_t *p = (uint32_t *)PHYS_TO_XKSEG_CACHED(block_desc->base_addr +
 							       AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
 		*p |= mask;
 		new_mask = *p;
 	}

 	pr_info("Reset core %d. Available Coremask = 0x%x \n", coreid, new_mask);
 	mb();
 	cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
 	cvmx_write_csr(CVMX_CIU_PP_RST, 0);
 }

 void play_dead(void)
 {
 	int cpu = cpu_number_map(cvmx_get_core_num());

 	idle_task_exit();
 	octeon_processor_boot = 0xff;
 	per_cpu(cpu_state, cpu) = CPU_DEAD;

 	mb();

 	while (1)	/* core will be reset here */
 		;
 }

 static void start_after_reset(void)
 {
 	kernel_entry(0, 0, 0);	/* set a2 = 0 for secondary core */
 }

 static int octeon_update_boot_vector(unsigned int cpu)
 {

 	int coreid = cpu_logical_map(cpu);
 	uint32_t avail_coremask;
 	const struct cvmx_bootmem_named_block_desc *block_desc;
 	struct boot_init_vector *boot_vect =
 		(struct boot_init_vector *)PHYS_TO_XKSEG_CACHED(BOOTLOADER_BOOT_VECTOR);

 	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);

 	if (!block_desc) {
 		struct linux_app_boot_info *labi;

 		labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);

 		avail_coremask = labi->avail_coremask;
 		labi->avail_coremask &= ~(1 << coreid);
 	} else {		       /* alternative, already initialized */
 		avail_coremask = *(uint32_t *)PHYS_TO_XKSEG_CACHED(
 			block_desc->base_addr + AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
 	}

 	if (!(avail_coremask & (1 << coreid))) {
 		/* core not available, assume, that caught by simple-executive */
 		cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
 		cvmx_write_csr(CVMX_CIU_PP_RST, 0);
 	}

 	boot_vect[coreid].app_start_func_addr =
 		(uint32_t) (unsigned long) start_after_reset;
 	boot_vect[coreid].code_addr = octeon_bootloader_entry_addr;

 	mb();

 	cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);

 	return 0;
 }

 static int register_cavium_notifier(void)
 {
 	return cpuhp_setup_state_nocalls(CPUHP_MIPS_SOC_PREPARE,
 					 "mips/cavium:prepare",
 					 octeon_update_boot_vector, NULL);
 }
 late_initcall(register_cavium_notifier);

 #endif	/* CONFIG_HOTPLUG_CPU */

 struct plat_smp_ops octeon_smp_ops = {
 	.send_ipi_single	= octeon_send_ipi_single,
 	.send_ipi_mask		= octeon_send_ipi_mask,
 	.init_secondary		= octeon_init_secondary,
 	.smp_finish		= octeon_smp_finish,
 	.boot_secondary		= octeon_boot_secondary,
 	.smp_setup		= octeon_smp_setup,
 	.prepare_cpus		= octeon_prepare_cpus,
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_disable		= octeon_cpu_disable,
 	.cpu_die		= octeon_cpu_die,
 #endif
 };

 static irqreturn_t octeon_78xx_reched_interrupt(int irq, void *dev_id)
 {
 	scheduler_ipi();
 	return IRQ_HANDLED;
 }

 static irqreturn_t octeon_78xx_call_function_interrupt(int irq, void *dev_id)
 {
 	generic_smp_call_function_interrupt();
 	return IRQ_HANDLED;
 }

 static irqreturn_t octeon_78xx_icache_flush_interrupt(int irq, void *dev_id)
 {
 	octeon_icache_flush();
 	return IRQ_HANDLED;
 }

 /*
  * Callout to firmware before smp_init
  */
 static void octeon_78xx_prepare_cpus(unsigned int max_cpus)
 {
 	if (request_irq(OCTEON_IRQ_MBOX0 + 0,
 			octeon_78xx_reched_interrupt,
 			IRQF_PERCPU | IRQF_NO_THREAD, "Scheduler",
 			octeon_78xx_reched_interrupt)) {
 		panic("Cannot request_irq for SchedulerIPI");
 	}
 	if (request_irq(OCTEON_IRQ_MBOX0 + 1,
 			octeon_78xx_call_function_interrupt,
 			IRQF_PERCPU | IRQF_NO_THREAD, "SMP-Call",
 			octeon_78xx_call_function_interrupt)) {
 		panic("Cannot request_irq for SMP-Call");
 	}
 	if (request_irq(OCTEON_IRQ_MBOX0 + 2,
 			octeon_78xx_icache_flush_interrupt,
 			IRQF_PERCPU | IRQF_NO_THREAD, "ICache-Flush",
 			octeon_78xx_icache_flush_interrupt)) {
 		panic("Cannot request_irq for ICache-Flush");
 	}
 }

 static void octeon_78xx_send_ipi_single(int cpu, unsigned int action)
 {
 	int i;

 	for (i = 0; i < 8; i++) {
 		if (action & 1)
 			octeon_ciu3_mbox_send(cpu, i);
 		action >>= 1;
 	}
 }

 static void octeon_78xx_send_ipi_mask(const struct cpumask *mask,
 				      unsigned int action)
 {
 	unsigned int cpu;

 	for_each_cpu(cpu, mask)
 		octeon_78xx_send_ipi_single(cpu, action);
 }

 static struct plat_smp_ops octeon_78xx_smp_ops = {
 	.send_ipi_single	= octeon_78xx_send_ipi_single,
 	.send_ipi_mask		= octeon_78xx_send_ipi_mask,
 	.init_secondary		= octeon_init_secondary,
 	.smp_finish		= octeon_smp_finish,
 	.boot_secondary		= octeon_boot_secondary,
 	.smp_setup		= octeon_smp_setup,
 	.prepare_cpus		= octeon_78xx_prepare_cpus,
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_disable		= octeon_cpu_disable,
 	.cpu_die		= octeon_cpu_die,
 #endif
 };

 void __init octeon_setup_smp(void)
 {
 	struct plat_smp_ops *ops;

 	if (octeon_has_feature(OCTEON_FEATURE_CIU3))
 		ops = &octeon_78xx_smp_ops;
 	else
 		ops = &octeon_smp_ops;

 	register_smp_ops(ops);
 }
	/*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*
	* Copyright (C) 2004-2008, 2009, 2010 Cavium Networks
	*/
	#include <linux/cpu.h>
	#include <linux/delay.h>
	#include <linux/smp.h>
	#include <linux/interrupt.h>
	#include <linux/kernel_stat.h>
	#include <linux/sched.h>
	#include <linux/sched/hotplug.h>
	#include <linux/sched/task_stack.h>
	#include <linux/init.h>
	#include <linux/export.h>

	#include <asm/mmu_context.h>
	#include <asm/time.h>
	#include <asm/setup.h>

	#include <asm/octeon/octeon.h>

	#include "octeon_boot.h"

	volatile unsigned long octeon_processor_boot = 0xff;
	volatile unsigned long octeon_processor_sp;
	volatile unsigned long octeon_processor_gp;
	#ifdef CONFIG_RELOCATABLE
	volatile unsigned long octeon_processor_relocated_kernel_entry;
	#endif /* CONFIG_RELOCATABLE */

	#ifdef CONFIG_HOTPLUG_CPU
	uint64_t octeon_bootloader_entry_addr;
	EXPORT_SYMBOL(octeon_bootloader_entry_addr);
	#endif

	extern void kernel_entry(unsigned long arg1, ...);

	static void octeon_icache_flush(void)
	{
	asm volatile ("synci 0($0)\n");
	}

	static void (*octeon_message_functions[8])(void) = {
	scheduler_ipi,
	generic_smp_call_function_interrupt,
	octeon_icache_flush,
	};

	static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
	{
	u64 mbox_clrx = CVMX_CIU_MBOX_CLRX(cvmx_get_core_num());
	u64 action;
	int i;

	/*
	* Make sure the function array initialization remains
	* correct.
	*/
	BUILD_BUG_ON(SMP_RESCHEDULE_YOURSELF != (1 << 0));
	BUILD_BUG_ON(SMP_CALL_FUNCTION != (1 << 1));
	BUILD_BUG_ON(SMP_ICACHE_FLUSH != (1 << 2));

	/*
	* Load the mailbox register to figure out what we're supposed
	* to do.
	*/
	action = cvmx_read_csr(mbox_clrx);

	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
	action &= 0xff;
	else
	action &= 0xffff;

	/* Clear the mailbox to clear the interrupt */
	cvmx_write_csr(mbox_clrx, action);

	for (i = 0; i < ARRAY_SIZE(octeon_message_functions) && action;) {
	if (action & 1) {
	void (*fn)(void) = octeon_message_functions[i];

	if (fn)
	fn();
	}
	action >>= 1;
	i++;
	}
	return IRQ_HANDLED;
	}

	/**
	* Cause the function described by call_data to be executed on the passed
	* cpu. When the function has finished, increment the finished field of
	* call_data.
	*/
	void octeon_send_ipi_single(int cpu, unsigned int action)
	{
	int coreid = cpu_logical_map(cpu);
	/*
	pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
	coreid, action);
	*/
	cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
	}

	static inline void octeon_send_ipi_mask(const struct cpumask *mask,
	unsigned int action)
	{
	unsigned int i;

	for_each_cpu(i, mask)
	octeon_send_ipi_single(i, action);
	}

	/**
	* Detect available CPUs, populate cpu_possible_mask
	*/
	static void octeon_smp_hotplug_setup(void)
	{
	#ifdef CONFIG_HOTPLUG_CPU
	struct linux_app_boot_info *labi;

	if (!setup_max_cpus)
	return;

	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
	if (labi->labi_signature != LABI_SIGNATURE) {
	pr_info("The bootloader on this board does not support HOTPLUG_CPU.");
	return;
	}

	octeon_bootloader_entry_addr = labi->InitTLBStart_addr;
	#endif
	}

	static void __init octeon_smp_setup(void)
	{
	const int coreid = cvmx_get_core_num();
	int cpus;
	int id;
	struct cvmx_sysinfo *sysinfo = cvmx_sysinfo_get();

	#ifdef CONFIG_HOTPLUG_CPU
	int core_mask = octeon_get_boot_coremask();
	unsigned int num_cores = cvmx_octeon_num_cores();
	#endif

	/* The present CPUs are initially just the boot cpu (CPU 0). */
	for (id = 0; id < NR_CPUS; id++) {
	set_cpu_possible(id, id == 0);
	set_cpu_present(id, id == 0);
	}

	__cpu_number_map[coreid] = 0;
	__cpu_logical_map[0] = coreid;

	/* The present CPUs get the lowest CPU numbers. */
	cpus = 1;
	for (id = 0; id < NR_CPUS; id++) {
	if ((id != coreid) && cvmx_coremask_is_core_set(&sysinfo->core_mask, id)) {
	set_cpu_possible(cpus, true);
	set_cpu_present(cpus, true);
	__cpu_number_map[id] = cpus;
	__cpu_logical_map[cpus] = id;
	cpus++;
	}
	}

	#ifdef CONFIG_HOTPLUG_CPU
	/*
	* The possible CPUs are all those present on the chip. We
	* will assign CPU numbers for possible cores as well. Cores
	* are always consecutively numberd from 0.
	*/
	for (id = 0; setup_max_cpus && octeon_bootloader_entry_addr &&
	id < num_cores && id < NR_CPUS; id++) {
	if (!(core_mask & (1 << id))) {
	set_cpu_possible(cpus, true);
	__cpu_number_map[id] = cpus;
	__cpu_logical_map[cpus] = id;
	cpus++;
	}
	}
	#endif

	octeon_smp_hotplug_setup();
	}


	#ifdef CONFIG_RELOCATABLE
	int plat_post_relocation(long offset)
	{
	unsigned long entry = (unsigned long)kernel_entry;

	/* Send secondaries into relocated kernel */
	octeon_processor_relocated_kernel_entry = entry + offset;

	return 0;
	}
	#endif /* CONFIG_RELOCATABLE */

	/**
	* Firmware CPU startup hook
	*
	*/
	static void octeon_boot_secondary(int cpu, struct task_struct *idle)
	{
	int count;

	pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
	cpu_logical_map(cpu));

	octeon_processor_sp = __KSTK_TOS(idle);
	octeon_processor_gp = (unsigned long)(task_thread_info(idle));
	octeon_processor_boot = cpu_logical_map(cpu);
	mb();

	count = 10000;
	while (octeon_processor_sp && count) {
	/* Waiting for processor to get the SP and GP */
	udelay(1);
	count--;
	}
	if (count == 0)
	pr_err("Secondary boot timeout\n");
	}

	/**
	* After we've done initial boot, this function is called to allow the
	* board code to clean up state, if needed
	*/
	static void octeon_init_secondary(void)
	{
	unsigned int sr;

	sr = set_c0_status(ST0_BEV);
	write_c0_ebase((u32)ebase);
	write_c0_status(sr);

	octeon_check_cpu_bist();
	octeon_init_cvmcount();

	octeon_irq_setup_secondary();
	}

	/**
	* Callout to firmware before smp_init
	*
	*/
	static void __init octeon_prepare_cpus(unsigned int max_cpus)
	{
	/*
	* Only the low order mailbox bits are used for IPIs, leave
	* the other bits alone.
	*/
	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffff);
	if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt,
	IRQF_PERCPU \| IRQF_NO_THREAD, "SMP-IPI",
	mailbox_interrupt)) {
	panic("Cannot request_irq(OCTEON_IRQ_MBOX0)");
	}
	}

	/**
	* Last chance for the board code to finish SMP initialization before
	* the CPU is "online".
	*/
	static void octeon_smp_finish(void)
	{
	octeon_user_io_init();

	/* to generate the first CPU timer interrupt */
	write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
	local_irq_enable();
	}

	#ifdef CONFIG_HOTPLUG_CPU

	/* State of each CPU. */
	DEFINE_PER_CPU(int, cpu_state);

	static int octeon_cpu_disable(void)
	{
	unsigned int cpu = smp_processor_id();

	if (cpu == 0)
	return -EBUSY;

	if (!octeon_bootloader_entry_addr)
	return -ENOTSUPP;

	set_cpu_online(cpu, false);
	calculate_cpu_foreign_map();
	octeon_fixup_irqs();

	__flush_cache_all();
	local_flush_tlb_all();

	return 0;
	}

	static void octeon_cpu_die(unsigned int cpu)
	{
	int coreid = cpu_logical_map(cpu);
	uint32_t mask, new_mask;
	const struct cvmx_bootmem_named_block_desc *block_desc;

	while (per_cpu(cpu_state, cpu) != CPU_DEAD)
	cpu_relax();

	/*
	* This is a bit complicated strategics of getting/settig available
	* cores mask, copied from bootloader
	*/

	mask = 1 << coreid;
	/* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */
	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);

	if (!block_desc) {
	struct linux_app_boot_info *labi;

	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);

	labi->avail_coremask \|= mask;
	new_mask = labi->avail_coremask;
	} else { /* alternative, already initialized */
	uint32_t p = (uint32_t )PHYS_TO_XKSEG_CACHED(block_desc->base_addr +
	AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
	*p \|= mask;
	new_mask = *p;
	}

	pr_info("Reset core %d. Available Coremask = 0x%x \n", coreid, new_mask);
	mb();
	cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
	cvmx_write_csr(CVMX_CIU_PP_RST, 0);
	}

	void play_dead(void)
	{
	int cpu = cpu_number_map(cvmx_get_core_num());

	idle_task_exit();
	octeon_processor_boot = 0xff;
	per_cpu(cpu_state, cpu) = CPU_DEAD;

	mb();

	while (1) /* core will be reset here */
	;
	}

	static void start_after_reset(void)
	{
	kernel_entry(0, 0, 0); /* set a2 = 0 for secondary core */
	}

	static int octeon_update_boot_vector(unsigned int cpu)
	{

	int coreid = cpu_logical_map(cpu);
	uint32_t avail_coremask;
	const struct cvmx_bootmem_named_block_desc *block_desc;
	struct boot_init_vector *boot_vect =
	(struct boot_init_vector *)PHYS_TO_XKSEG_CACHED(BOOTLOADER_BOOT_VECTOR);

	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);

	if (!block_desc) {
	struct linux_app_boot_info *labi;

	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);

	avail_coremask = labi->avail_coremask;
	labi->avail_coremask &= ~(1 << coreid);
	} else { /* alternative, already initialized */
	avail_coremask = (uint32_t )PHYS_TO_XKSEG_CACHED(
	block_desc->base_addr + AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
	}

	if (!(avail_coremask & (1 << coreid))) {
	/* core not available, assume, that caught by simple-executive */
	cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
	cvmx_write_csr(CVMX_CIU_PP_RST, 0);
	}

	boot_vect[coreid].app_start_func_addr =
	(uint32_t) (unsigned long) start_after_reset;
	boot_vect[coreid].code_addr = octeon_bootloader_entry_addr;

	mb();

	cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);

	return 0;
	}

	static int register_cavium_notifier(void)
	{
	return cpuhp_setup_state_nocalls(CPUHP_MIPS_SOC_PREPARE,
	"mips/cavium:prepare",
	octeon_update_boot_vector, NULL);
	}
	late_initcall(register_cavium_notifier);

	#endif /* CONFIG_HOTPLUG_CPU */

	struct plat_smp_ops octeon_smp_ops = {
	.send_ipi_single = octeon_send_ipi_single,
	.send_ipi_mask = octeon_send_ipi_mask,
	.init_secondary = octeon_init_secondary,
	.smp_finish = octeon_smp_finish,
	.boot_secondary = octeon_boot_secondary,
	.smp_setup = octeon_smp_setup,
	.prepare_cpus = octeon_prepare_cpus,
	#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable = octeon_cpu_disable,
	.cpu_die = octeon_cpu_die,
	#endif
	};

	static irqreturn_t octeon_78xx_reched_interrupt(int irq, void *dev_id)
	{
	scheduler_ipi();
	return IRQ_HANDLED;
	}

	static irqreturn_t octeon_78xx_call_function_interrupt(int irq, void *dev_id)
	{
	generic_smp_call_function_interrupt();
	return IRQ_HANDLED;
	}

	static irqreturn_t octeon_78xx_icache_flush_interrupt(int irq, void *dev_id)
	{
	octeon_icache_flush();
	return IRQ_HANDLED;
	}

	/*
	* Callout to firmware before smp_init
	*/
	static void octeon_78xx_prepare_cpus(unsigned int max_cpus)
	{
	if (request_irq(OCTEON_IRQ_MBOX0 + 0,
	octeon_78xx_reched_interrupt,
	IRQF_PERCPU \| IRQF_NO_THREAD, "Scheduler",
	octeon_78xx_reched_interrupt)) {
	panic("Cannot request_irq for SchedulerIPI");
	}
	if (request_irq(OCTEON_IRQ_MBOX0 + 1,
	octeon_78xx_call_function_interrupt,
	IRQF_PERCPU \| IRQF_NO_THREAD, "SMP-Call",
	octeon_78xx_call_function_interrupt)) {
	panic("Cannot request_irq for SMP-Call");
	}
	if (request_irq(OCTEON_IRQ_MBOX0 + 2,
	octeon_78xx_icache_flush_interrupt,
	IRQF_PERCPU \| IRQF_NO_THREAD, "ICache-Flush",
	octeon_78xx_icache_flush_interrupt)) {
	panic("Cannot request_irq for ICache-Flush");
	}
	}

	static void octeon_78xx_send_ipi_single(int cpu, unsigned int action)
	{
	int i;

	for (i = 0; i < 8; i++) {
	if (action & 1)
	octeon_ciu3_mbox_send(cpu, i);
	action >>= 1;
	}
	}

	static void octeon_78xx_send_ipi_mask(const struct cpumask *mask,
	unsigned int action)
	{
	unsigned int cpu;

	for_each_cpu(cpu, mask)
	octeon_78xx_send_ipi_single(cpu, action);
	}

	static struct plat_smp_ops octeon_78xx_smp_ops = {
	.send_ipi_single = octeon_78xx_send_ipi_single,
	.send_ipi_mask = octeon_78xx_send_ipi_mask,
	.init_secondary = octeon_init_secondary,
	.smp_finish = octeon_smp_finish,
	.boot_secondary = octeon_boot_secondary,
	.smp_setup = octeon_smp_setup,
	.prepare_cpus = octeon_78xx_prepare_cpus,
	#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable = octeon_cpu_disable,
	.cpu_die = octeon_cpu_die,
	#endif
	};

	void __init octeon_setup_smp(void)
	{
	struct plat_smp_ops *ops;

	if (octeon_has_feature(OCTEON_FEATURE_CIU3))
	ops = &octeon_78xx_smp_ops;
	else
	ops = &octeon_smp_ops;

	register_smp_ops(ops);
	}