arch/powerpc/platforms/powernv/setup.c - linux - Git at Google

 /*
  * PowerNV setup code.
  *
  * Copyright 2011 IBM Corp.
  *
  * 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; either version
  * 2 of the License, or (at your option) any later version.
  */

 #undef DEBUG

 #include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/tty.h>
 #include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/delay.h>
 #include <linux/irq.h>
 #include <linux/seq_file.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/interrupt.h>
 #include <linux/bug.h>
 #include <linux/pci.h>
 #include <linux/cpufreq.h>

 #include <asm/machdep.h>
 #include <asm/firmware.h>
 #include <asm/xics.h>
 #include <asm/xive.h>
 #include <asm/opal.h>
 #include <asm/kexec.h>
 #include <asm/smp.h>
 #include <asm/tm.h>

 #include "powernv.h"

 static void __init pnv_setup_arch(void)
 {
 	set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);

 	/* Initialize SMP */
 	pnv_smp_init();

 	/* Setup PCI */
 	pnv_pci_init();

 	/* Setup RTC and NVRAM callbacks */
 	if (firmware_has_feature(FW_FEATURE_OPAL))
 		opal_nvram_init();

 	/* Enable NAP mode */
 	powersave_nap = 1;

 	/* XXX PMCS */
 }

 static void __init pnv_init(void)
 {
 	/*
 	 * Initialize the LPC bus now so that legacy serial
 	 * ports can be found on it
 	 */
 	opal_lpc_init();

 #ifdef CONFIG_HVC_OPAL
 	if (firmware_has_feature(FW_FEATURE_OPAL))
 		hvc_opal_init_early();
 	else
 #endif
 		add_preferred_console("hvc", 0, NULL);
 }

 static void __init pnv_init_IRQ(void)
 {
 	/* Try using a XIVE if available, otherwise use a XICS */
 	if (!xive_native_init())
 		xics_init();

 	WARN_ON(!ppc_md.get_irq);
 }

 static void pnv_show_cpuinfo(struct seq_file *m)
 {
 	struct device_node *root;
 	const char *model = "";

 	root = of_find_node_by_path("/");
 	if (root)
 		model = of_get_property(root, "model", NULL);
 	seq_printf(m, "machine\t\t: PowerNV %s\n", model);
 	if (firmware_has_feature(FW_FEATURE_OPAL))
 		seq_printf(m, "firmware\t: OPAL\n");
 	else
 		seq_printf(m, "firmware\t: BML\n");
 	of_node_put(root);
 	if (radix_enabled())
 		seq_printf(m, "MMU\t\t: Radix\n");
 	else
 		seq_printf(m, "MMU\t\t: Hash\n");
 }

 static void pnv_prepare_going_down(void)
 {
 	/*
 	 * Disable all notifiers from OPAL, we can't
 	 * service interrupts anymore anyway
 	 */
 	opal_event_shutdown();

 	/* Soft disable interrupts */
 	local_irq_disable();

 	/*
 	 * Return secondary CPUs to firwmare if a flash update
 	 * is pending otherwise we will get all sort of error
 	 * messages about CPU being stuck etc.. This will also
 	 * have the side effect of hard disabling interrupts so
 	 * past this point, the kernel is effectively dead.
 	 */
 	opal_flash_term_callback();
 }

 static void  __noreturn pnv_restart(char *cmd)
 {
 	long rc = OPAL_BUSY;

 	pnv_prepare_going_down();

 	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 		rc = opal_cec_reboot();
 		if (rc == OPAL_BUSY_EVENT)
 			opal_poll_events(NULL);
 		else
 			mdelay(10);
 	}
 	for (;;)
 		opal_poll_events(NULL);
 }

 static void __noreturn pnv_power_off(void)
 {
 	long rc = OPAL_BUSY;

 	pnv_prepare_going_down();

 	while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 		rc = opal_cec_power_down(0);
 		if (rc == OPAL_BUSY_EVENT)
 			opal_poll_events(NULL);
 		else
 			mdelay(10);
 	}
 	for (;;)
 		opal_poll_events(NULL);
 }

 static void __noreturn pnv_halt(void)
 {
 	pnv_power_off();
 }

 static void pnv_progress(char *s, unsigned short hex)
 {
 }

 static void pnv_shutdown(void)
 {
 	/* Let the PCI code clear up IODA tables */
 	pnv_pci_shutdown();

 	/*
 	 * Stop OPAL activity: Unregister all OPAL interrupts so they
 	 * don't fire up while we kexec and make sure all potentially
 	 * DMA'ing ops are complete (such as dump retrieval).
 	 */
 	opal_shutdown();
 }

 #ifdef CONFIG_KEXEC_CORE
 static void pnv_kexec_wait_secondaries_down(void)
 {
 	int my_cpu, i, notified = -1;

 	my_cpu = get_cpu();

 	for_each_online_cpu(i) {
 		uint8_t status;
 		int64_t rc, timeout = 1000;

 		if (i == my_cpu)
 			continue;

 		for (;;) {
 			rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
 						   &status);
 			if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
 				break;
 			barrier();
 			if (i != notified) {
 				printk(KERN_INFO "kexec: waiting for cpu %d "
 				       "(physical %d) to enter OPAL\n",
 				       i, paca[i].hw_cpu_id);
 				notified = i;
 			}

 			/*
 			 * On crash secondaries might be unreachable or hung,
 			 * so timeout if we've waited too long
 			 * */
 			mdelay(1);
 			if (timeout-- == 0) {
 				printk(KERN_ERR "kexec: timed out waiting for "
 				       "cpu %d (physical %d) to enter OPAL\n",
 				       i, paca[i].hw_cpu_id);
 				break;
 			}
 		}
 	}
 }

 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 {
 	u64 reinit_flags;

 	if (xive_enabled())
 		xive_kexec_teardown_cpu(secondary);
 	else
 		xics_kexec_teardown_cpu(secondary);

 	/* On OPAL, we return all CPUs to firmware */
 	if (!firmware_has_feature(FW_FEATURE_OPAL))
 		return;

 	if (secondary) {
 		/* Return secondary CPUs to firmware on OPAL v3 */
 		mb();
 		get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
 		mb();

 		/* Return the CPU to OPAL */
 		opal_return_cpu();
 	} else {
 		/* Primary waits for the secondaries to have reached OPAL */
 		pnv_kexec_wait_secondaries_down();

 		/* Switch XIVE back to emulation mode */
 		if (xive_enabled())
 			xive_shutdown();

 		/*
 		 * We might be running as little-endian - now that interrupts
 		 * are disabled, reset the HILE bit to big-endian so we don't
 		 * take interrupts in the wrong endian later
 		 *
 		 * We reinit to enable both radix and hash on P9 to ensure
 		 * the mode used by the next kernel is always supported.
 		 */
 		reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
 		if (cpu_has_feature(CPU_FTR_ARCH_300))
 			reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
 				OPAL_REINIT_CPUS_MMU_HASH;
 		opal_reinit_cpus(reinit_flags);
 	}
 }
 #endif /* CONFIG_KEXEC_CORE */

 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 static unsigned long pnv_memory_block_size(void)
 {
 	/*
 	 * We map the kernel linear region with 1GB large pages on radix. For
 	 * memory hot unplug to work our memory block size must be at least
 	 * this size.
 	 */
 	if (radix_enabled())
 		return 1UL * 1024 * 1024 * 1024;
 	else
 		return 256UL * 1024 * 1024;
 }
 #endif

 static void __init pnv_setup_machdep_opal(void)
 {
 	ppc_md.get_boot_time = opal_get_boot_time;
 	ppc_md.restart = pnv_restart;
 	pm_power_off = pnv_power_off;
 	ppc_md.halt = pnv_halt;
 	/* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
 	ppc_md.machine_check_exception = opal_machine_check;
 	ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
 	ppc_md.hmi_exception_early = opal_hmi_exception_early;
 	ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
 }

 static int __init pnv_probe(void)
 {
 	if (!of_machine_is_compatible("ibm,powernv"))
 		return 0;

 	if (firmware_has_feature(FW_FEATURE_OPAL))
 		pnv_setup_machdep_opal();

 	pr_debug("PowerNV detected !\n");

 	pnv_init();

 	return 1;
 }

 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 void __init pnv_tm_init(void)
 {
 	if (!firmware_has_feature(FW_FEATURE_OPAL) ||
 	    !pvr_version_is(PVR_POWER9) ||
 	    early_cpu_has_feature(CPU_FTR_TM))
 		return;

 	if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
 		return;

 	pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
 	cur_cpu_spec->cpu_features |= CPU_FTR_TM;
 	/* Make sure "normal" HTM is off (it should be) */
 	cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
 	/* Turn on no suspend mode, and HTM no SC */
 	cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
 					    PPC_FEATURE2_HTM_NOSC;
 	tm_suspend_disabled = true;
 }
 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */

 /*
  * Returns the cpu frequency for 'cpu' in Hz. This is used by
  * /proc/cpuinfo
  */
 static unsigned long pnv_get_proc_freq(unsigned int cpu)
 {
 	unsigned long ret_freq;

 	ret_freq = cpufreq_get(cpu) * 1000ul;

 	/*
 	 * If the backend cpufreq driver does not exist,
          * then fallback to old way of reporting the clockrate.
 	 */
 	if (!ret_freq)
 		ret_freq = ppc_proc_freq;
 	return ret_freq;
 }

 define_machine(powernv) {
 	.name			= "PowerNV",
 	.probe			= pnv_probe,
 	.setup_arch		= pnv_setup_arch,
 	.init_IRQ		= pnv_init_IRQ,
 	.show_cpuinfo		= pnv_show_cpuinfo,
 	.get_proc_freq          = pnv_get_proc_freq,
 	.progress		= pnv_progress,
 	.machine_shutdown	= pnv_shutdown,
 	.power_save             = NULL,
 	.calibrate_decr		= generic_calibrate_decr,
 #ifdef CONFIG_KEXEC_CORE
 	.kexec_cpu_down		= pnv_kexec_cpu_down,
 #endif
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 	.memory_block_size	= pnv_memory_block_size,
 #endif
 };
	/*
	* PowerNV setup code.
	*
	* Copyright 2011 IBM Corp.
	*
	* 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; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#undef DEBUG

	#include <linux/cpu.h>
	#include <linux/errno.h>
	#include <linux/sched.h>
	#include <linux/kernel.h>
	#include <linux/tty.h>
	#include <linux/reboot.h>
	#include <linux/init.h>
	#include <linux/console.h>
	#include <linux/delay.h>
	#include <linux/irq.h>
	#include <linux/seq_file.h>
	#include <linux/of.h>
	#include <linux/of_fdt.h>
	#include <linux/interrupt.h>
	#include <linux/bug.h>
	#include <linux/pci.h>
	#include <linux/cpufreq.h>

	#include <asm/machdep.h>
	#include <asm/firmware.h>
	#include <asm/xics.h>
	#include <asm/xive.h>
	#include <asm/opal.h>
	#include <asm/kexec.h>
	#include <asm/smp.h>
	#include <asm/tm.h>

	#include "powernv.h"

	static void __init pnv_setup_arch(void)
	{
	set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);

	/* Initialize SMP */
	pnv_smp_init();

	/* Setup PCI */
	pnv_pci_init();

	/* Setup RTC and NVRAM callbacks */
	if (firmware_has_feature(FW_FEATURE_OPAL))
	opal_nvram_init();

	/* Enable NAP mode */
	powersave_nap = 1;

	/* XXX PMCS */
	}

	static void __init pnv_init(void)
	{
	/*
	* Initialize the LPC bus now so that legacy serial
	* ports can be found on it
	*/
	opal_lpc_init();

	#ifdef CONFIG_HVC_OPAL
	if (firmware_has_feature(FW_FEATURE_OPAL))
	hvc_opal_init_early();
	else
	#endif
	add_preferred_console("hvc", 0, NULL);
	}

	static void __init pnv_init_IRQ(void)
	{
	/* Try using a XIVE if available, otherwise use a XICS */
	if (!xive_native_init())
	xics_init();

	WARN_ON(!ppc_md.get_irq);
	}

	static void pnv_show_cpuinfo(struct seq_file *m)
	{
	struct device_node *root;
	const char *model = "";

	root = of_find_node_by_path("/");
	if (root)
	model = of_get_property(root, "model", NULL);
	seq_printf(m, "machine\t\t: PowerNV %s\n", model);
	if (firmware_has_feature(FW_FEATURE_OPAL))
	seq_printf(m, "firmware\t: OPAL\n");
	else
	seq_printf(m, "firmware\t: BML\n");
	of_node_put(root);
	if (radix_enabled())
	seq_printf(m, "MMU\t\t: Radix\n");
	else
	seq_printf(m, "MMU\t\t: Hash\n");
	}

	static void pnv_prepare_going_down(void)
	{
	/*
	* Disable all notifiers from OPAL, we can't
	* service interrupts anymore anyway
	*/
	opal_event_shutdown();

	/* Soft disable interrupts */
	local_irq_disable();

	/*
	* Return secondary CPUs to firwmare if a flash update
	* is pending otherwise we will get all sort of error
	* messages about CPU being stuck etc.. This will also
	* have the side effect of hard disabling interrupts so
	* past this point, the kernel is effectively dead.
	*/
	opal_flash_term_callback();
	}

	static void __noreturn pnv_restart(char *cmd)
	{
	long rc = OPAL_BUSY;

	pnv_prepare_going_down();

	while (rc == OPAL_BUSY \|\| rc == OPAL_BUSY_EVENT) {
	rc = opal_cec_reboot();
	if (rc == OPAL_BUSY_EVENT)
	opal_poll_events(NULL);
	else
	mdelay(10);
	}
	for (;;)
	opal_poll_events(NULL);
	}

	static void __noreturn pnv_power_off(void)
	{
	long rc = OPAL_BUSY;

	pnv_prepare_going_down();

	while (rc == OPAL_BUSY \|\| rc == OPAL_BUSY_EVENT) {
	rc = opal_cec_power_down(0);
	if (rc == OPAL_BUSY_EVENT)
	opal_poll_events(NULL);
	else
	mdelay(10);
	}
	for (;;)
	opal_poll_events(NULL);
	}

	static void __noreturn pnv_halt(void)
	{
	pnv_power_off();
	}

	static void pnv_progress(char *s, unsigned short hex)
	{
	}

	static void pnv_shutdown(void)
	{
	/* Let the PCI code clear up IODA tables */
	pnv_pci_shutdown();

	/*
	* Stop OPAL activity: Unregister all OPAL interrupts so they
	* don't fire up while we kexec and make sure all potentially
	* DMA'ing ops are complete (such as dump retrieval).
	*/
	opal_shutdown();
	}

	#ifdef CONFIG_KEXEC_CORE
	static void pnv_kexec_wait_secondaries_down(void)
	{
	int my_cpu, i, notified = -1;

	my_cpu = get_cpu();

	for_each_online_cpu(i) {
	uint8_t status;
	int64_t rc, timeout = 1000;

	if (i == my_cpu)
	continue;

	for (;;) {
	rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
	&status);
	if (rc != OPAL_SUCCESS \|\| status != OPAL_THREAD_STARTED)
	break;
	barrier();
	if (i != notified) {
	printk(KERN_INFO "kexec: waiting for cpu %d "
	"(physical %d) to enter OPAL\n",
	i, paca[i].hw_cpu_id);
	notified = i;
	}

	/*
	* On crash secondaries might be unreachable or hung,
	* so timeout if we've waited too long
	* */
	mdelay(1);
	if (timeout-- == 0) {
	printk(KERN_ERR "kexec: timed out waiting for "
	"cpu %d (physical %d) to enter OPAL\n",
	i, paca[i].hw_cpu_id);
	break;
	}
	}
	}
	}

	static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
	{
	u64 reinit_flags;

	if (xive_enabled())
	xive_kexec_teardown_cpu(secondary);
	else
	xics_kexec_teardown_cpu(secondary);

	/* On OPAL, we return all CPUs to firmware */
	if (!firmware_has_feature(FW_FEATURE_OPAL))
	return;

	if (secondary) {
	/* Return secondary CPUs to firmware on OPAL v3 */
	mb();
	get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
	mb();

	/* Return the CPU to OPAL */
	opal_return_cpu();
	} else {
	/* Primary waits for the secondaries to have reached OPAL */
	pnv_kexec_wait_secondaries_down();

	/* Switch XIVE back to emulation mode */
	if (xive_enabled())
	xive_shutdown();

	/*
	* We might be running as little-endian - now that interrupts
	* are disabled, reset the HILE bit to big-endian so we don't
	* take interrupts in the wrong endian later
	*
	* We reinit to enable both radix and hash on P9 to ensure
	* the mode used by the next kernel is always supported.
	*/
	reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
	if (cpu_has_feature(CPU_FTR_ARCH_300))
	reinit_flags \|= OPAL_REINIT_CPUS_MMU_RADIX \|
	OPAL_REINIT_CPUS_MMU_HASH;
	opal_reinit_cpus(reinit_flags);
	}
	}
	#endif /* CONFIG_KEXEC_CORE */

	#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
	static unsigned long pnv_memory_block_size(void)
	{
	/*
	* We map the kernel linear region with 1GB large pages on radix. For
	* memory hot unplug to work our memory block size must be at least
	* this size.
	*/
	if (radix_enabled())
	return 1UL * 1024 * 1024 * 1024;
	else
	return 256UL * 1024 * 1024;
	}
	#endif

	static void __init pnv_setup_machdep_opal(void)
	{
	ppc_md.get_boot_time = opal_get_boot_time;
	ppc_md.restart = pnv_restart;
	pm_power_off = pnv_power_off;
	ppc_md.halt = pnv_halt;
	/* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
	ppc_md.machine_check_exception = opal_machine_check;
	ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
	ppc_md.hmi_exception_early = opal_hmi_exception_early;
	ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
	}

	static int __init pnv_probe(void)
	{
	if (!of_machine_is_compatible("ibm,powernv"))
	return 0;

	if (firmware_has_feature(FW_FEATURE_OPAL))
	pnv_setup_machdep_opal();

	pr_debug("PowerNV detected !\n");

	pnv_init();

	return 1;
	}

	#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	void __init pnv_tm_init(void)
	{
	if (!firmware_has_feature(FW_FEATURE_OPAL) \|\|
	!pvr_version_is(PVR_POWER9) \|\|
	early_cpu_has_feature(CPU_FTR_TM))
	return;

	if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
	return;

	pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
	cur_cpu_spec->cpu_features \|= CPU_FTR_TM;
	/* Make sure "normal" HTM is off (it should be) */
	cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
	/* Turn on no suspend mode, and HTM no SC */
	cur_cpu_spec->cpu_user_features2 \|= PPC_FEATURE2_HTM_NO_SUSPEND \| \
	PPC_FEATURE2_HTM_NOSC;
	tm_suspend_disabled = true;
	}
	#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */

	/*
	* Returns the cpu frequency for 'cpu' in Hz. This is used by
	* /proc/cpuinfo
	*/
	static unsigned long pnv_get_proc_freq(unsigned int cpu)
	{
	unsigned long ret_freq;

	ret_freq = cpufreq_get(cpu) * 1000ul;

	/*
	* If the backend cpufreq driver does not exist,
	* then fallback to old way of reporting the clockrate.
	*/
	if (!ret_freq)
	ret_freq = ppc_proc_freq;
	return ret_freq;
	}

	define_machine(powernv) {
	.name = "PowerNV",
	.probe = pnv_probe,
	.setup_arch = pnv_setup_arch,
	.init_IRQ = pnv_init_IRQ,
	.show_cpuinfo = pnv_show_cpuinfo,
	.get_proc_freq = pnv_get_proc_freq,
	.progress = pnv_progress,
	.machine_shutdown = pnv_shutdown,
	.power_save = NULL,
	.calibrate_decr = generic_calibrate_decr,
	#ifdef CONFIG_KEXEC_CORE
	.kexec_cpu_down = pnv_kexec_cpu_down,
	#endif
	#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
	.memory_block_size = pnv_memory_block_size,
	#endif
	};