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

 /*
  * PowerNV OPAL high level interfaces
  *
  * 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/types.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/interrupt.h>
 #include <asm/opal.h>
 #include <asm/firmware.h>

 #include "powernv.h"

 struct opal {
 	u64 base;
 	u64 entry;
 } opal;

 static struct device_node *opal_node;
 static DEFINE_SPINLOCK(opal_write_lock);
 extern u64 opal_mc_secondary_handler[];

 int __init early_init_dt_scan_opal(unsigned long node,
 				   const char *uname, int depth, void *data)
 {
 	const void *basep, *entryp;
 	unsigned long basesz, entrysz;
 	u64 glue;

 	if (depth != 1 || strcmp(uname, "ibm,opal") != 0)
 		return 0;

 	basep  = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
 	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);

 	if (!basep || !entryp)
 		return 1;

 	opal.base = of_read_number(basep, basesz/4);
 	opal.entry = of_read_number(entryp, entrysz/4);

 	pr_debug("OPAL Base  = 0x%llx (basep=%p basesz=%ld)\n",
 		 opal.base, basep, basesz);
 	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
 		 opal.entry, entryp, entrysz);

 	powerpc_firmware_features |= FW_FEATURE_OPAL;
 	if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
 		powerpc_firmware_features |= FW_FEATURE_OPALv2;
 		printk("OPAL V2 detected !\n");
 	} else {
 		printk("OPAL V1 detected !\n");
 	}

 	/* Hookup some exception handlers. We use the fwnmi area at 0x7000
 	 * to provide the glue space to OPAL
 	 */
 	glue = 0x7000;
 	opal_register_exception_handler(OPAL_MACHINE_CHECK_HANDLER,
 					__pa(opal_mc_secondary_handler[0]),
 					glue);
 	glue += 128;
 	opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
 					0, glue);
 	glue += 128;
 	opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);

 	return 1;
 }

 int opal_get_chars(uint32_t vtermno, char *buf, int count)
 {
 	s64 len, rc;
 	u64 evt;

 	if (!opal.entry)
 		return -ENODEV;
 	opal_poll_events(&evt);
 	if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0)
 		return 0;
 	len = count;
 	rc = opal_console_read(vtermno, &len, buf);
 	if (rc == OPAL_SUCCESS)
 		return len;
 	return 0;
 }

 int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
 {
 	int written = 0;
 	s64 len, rc;
 	unsigned long flags;
 	u64 evt;

 	if (!opal.entry)
 		return -ENODEV;

 	/* We want put_chars to be atomic to avoid mangling of hvsi
 	 * packets. To do that, we first test for room and return
 	 * -EAGAIN if there isn't enough.
 	 *
 	 * Unfortunately, opal_console_write_buffer_space() doesn't
 	 * appear to work on opal v1, so we just assume there is
 	 * enough room and be done with it
 	 */
 	spin_lock_irqsave(&opal_write_lock, flags);
 	if (firmware_has_feature(FW_FEATURE_OPALv2)) {
 		rc = opal_console_write_buffer_space(vtermno, &len);
 		if (rc || len < total_len) {
 			spin_unlock_irqrestore(&opal_write_lock, flags);
 			/* Closed -> drop characters */
 			if (rc)
 				return total_len;
 			opal_poll_events(&evt);
 			return -EAGAIN;
 		}
 	}

 	/* We still try to handle partial completions, though they
 	 * should no longer happen.
 	 */
 	rc = OPAL_BUSY;
 	while(total_len > 0 && (rc == OPAL_BUSY ||
 				rc == OPAL_BUSY_EVENT || rc == OPAL_SUCCESS)) {
 		len = total_len;
 		rc = opal_console_write(vtermno, &len, data);
 		if (rc == OPAL_SUCCESS) {
 			total_len -= len;
 			data += len;
 			written += len;
 		}
 		/* This is a bit nasty but we need that for the console to
 		 * flush when there aren't any interrupts. We will clean
 		 * things a bit later to limit that to synchronous path
 		 * such as the kernel console and xmon/udbg
 		 */
 		do
 			opal_poll_events(&evt);
 		while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT));
 	}
 	spin_unlock_irqrestore(&opal_write_lock, flags);
 	return written;
 }

 int opal_machine_check(struct pt_regs *regs)
 {
 	struct opal_machine_check_event *opal_evt = get_paca()->opal_mc_evt;
 	struct opal_machine_check_event evt;
 	const char *level, *sevstr, *subtype;
 	static const char *opal_mc_ue_types[] = {
 		"Indeterminate",
 		"Instruction fetch",
 		"Page table walk ifetch",
 		"Load/Store",
 		"Page table walk Load/Store",
 	};
 	static const char *opal_mc_slb_types[] = {
 		"Indeterminate",
 		"Parity",
 		"Multihit",
 	};
 	static const char *opal_mc_erat_types[] = {
 		"Indeterminate",
 		"Parity",
 		"Multihit",
 	};
 	static const char *opal_mc_tlb_types[] = {
 		"Indeterminate",
 		"Parity",
 		"Multihit",
 	};

 	/* Copy the event structure and release the original */
 	evt = *opal_evt;
 	opal_evt->in_use = 0;

 	/* Print things out */
 	if (evt.version != OpalMCE_V1) {
 		pr_err("Machine Check Exception, Unknown event version %d !\n",
 		       evt.version);
 		return 0;
 	}
 	switch(evt.severity) {
 	case OpalMCE_SEV_NO_ERROR:
 		level = KERN_INFO;
 		sevstr = "Harmless";
 		break;
 	case OpalMCE_SEV_WARNING:
 		level = KERN_WARNING;
 		sevstr = "";
 		break;
 	case OpalMCE_SEV_ERROR_SYNC:
 		level = KERN_ERR;
 		sevstr = "Severe";
 		break;
 	case OpalMCE_SEV_FATAL:
 	default:
 		level = KERN_ERR;
 		sevstr = "Fatal";
 		break;
 	}

 	printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
 	       evt.disposition == OpalMCE_DISPOSITION_RECOVERED ?
 	       "Recovered" : "[Not recovered");
 	printk("%s  Initiator: %s\n", level,
 	       evt.initiator == OpalMCE_INITIATOR_CPU ? "CPU" : "Unknown");
 	switch(evt.error_type) {
 	case OpalMCE_ERROR_TYPE_UE:
 		subtype = evt.u.ue_error.ue_error_type <
 			ARRAY_SIZE(opal_mc_ue_types) ?
 			opal_mc_ue_types[evt.u.ue_error.ue_error_type]
 			: "Unknown";
 		printk("%s  Error type: UE [%s]\n", level, subtype);
 		if (evt.u.ue_error.effective_address_provided)
 			printk("%s    Effective address: %016llx\n",
 			       level, evt.u.ue_error.effective_address);
 		if (evt.u.ue_error.physical_address_provided)
 			printk("%s      Physial address: %016llx\n",
 			       level, evt.u.ue_error.physical_address);
 		break;
 	case OpalMCE_ERROR_TYPE_SLB:
 		subtype = evt.u.slb_error.slb_error_type <
 			ARRAY_SIZE(opal_mc_slb_types) ?
 			opal_mc_slb_types[evt.u.slb_error.slb_error_type]
 			: "Unknown";
 		printk("%s  Error type: SLB [%s]\n", level, subtype);
 		if (evt.u.slb_error.effective_address_provided)
 			printk("%s    Effective address: %016llx\n",
 			       level, evt.u.slb_error.effective_address);
 		break;
 	case OpalMCE_ERROR_TYPE_ERAT:
 		subtype = evt.u.erat_error.erat_error_type <
 			ARRAY_SIZE(opal_mc_erat_types) ?
 			opal_mc_erat_types[evt.u.erat_error.erat_error_type]
 			: "Unknown";
 		printk("%s  Error type: ERAT [%s]\n", level, subtype);
 		if (evt.u.erat_error.effective_address_provided)
 			printk("%s    Effective address: %016llx\n",
 			       level, evt.u.erat_error.effective_address);
 		break;
 	case OpalMCE_ERROR_TYPE_TLB:
 		subtype = evt.u.tlb_error.tlb_error_type <
 			ARRAY_SIZE(opal_mc_tlb_types) ?
 			opal_mc_tlb_types[evt.u.tlb_error.tlb_error_type]
 			: "Unknown";
 		printk("%s  Error type: TLB [%s]\n", level, subtype);
 		if (evt.u.tlb_error.effective_address_provided)
 			printk("%s    Effective address: %016llx\n",
 			       level, evt.u.tlb_error.effective_address);
 		break;
 	default:
 	case OpalMCE_ERROR_TYPE_UNKNOWN:
 		printk("%s  Error type: Unknown\n", level);
 		break;
 	}
 	return evt.severity == OpalMCE_SEV_FATAL ? 0 : 1;
 }

 static irqreturn_t opal_interrupt(int irq, void *data)
 {
 	uint64_t events;

 	opal_handle_interrupt(virq_to_hw(irq), &events);

 	/* XXX TODO: Do something with the events */

 	return IRQ_HANDLED;
 }

 static int __init opal_init(void)
 {
 	struct device_node *np, *consoles;
 	const u32 *irqs;
 	int rc, i, irqlen;

 	opal_node = of_find_node_by_path("/ibm,opal");
 	if (!opal_node) {
 		pr_warn("opal: Node not found\n");
 		return -ENODEV;
 	}
 	if (firmware_has_feature(FW_FEATURE_OPALv2))
 		consoles = of_find_node_by_path("/ibm,opal/consoles");
 	else
 		consoles = of_node_get(opal_node);

 	/* Register serial ports */
 	for_each_child_of_node(consoles, np) {
 		if (strcmp(np->name, "serial"))
 			continue;
 		of_platform_device_create(np, NULL, NULL);
 	}
 	of_node_put(consoles);

 	/* Find all OPAL interrupts and request them */
 	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
 	pr_debug("opal: Found %d interrupts reserved for OPAL\n",
 		 irqs ? (irqlen / 4) : 0);
 	for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
 		unsigned int hwirq = be32_to_cpup(irqs);
 		unsigned int irq = irq_create_mapping(NULL, hwirq);
 		if (irq == NO_IRQ) {
 			pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
 			continue;
 		}
 		rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
 		if (rc)
 			pr_warning("opal: Error %d requesting irq %d"
 				   " (0x%x)\n", rc, irq, hwirq);
 	}
 	return 0;
 }
 subsys_initcall(opal_init);
	/*
	* PowerNV OPAL high level interfaces
	*
	* 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/types.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/interrupt.h>
	#include <asm/opal.h>
	#include <asm/firmware.h>

	#include "powernv.h"

	struct opal {
	u64 base;
	u64 entry;
	} opal;

	static struct device_node *opal_node;
	static DEFINE_SPINLOCK(opal_write_lock);
	extern u64 opal_mc_secondary_handler[];

	int __init early_init_dt_scan_opal(unsigned long node,
	const char uname, int depth, void data)
	{
	const void basep, entryp;
	unsigned long basesz, entrysz;
	u64 glue;

	if (depth != 1 \|\| strcmp(uname, "ibm,opal") != 0)
	return 0;

	basep = of_get_flat_dt_prop(node, "opal-base-address", &basesz);
	entryp = of_get_flat_dt_prop(node, "opal-entry-address", &entrysz);

	if (!basep \|\| !entryp)
	return 1;

	opal.base = of_read_number(basep, basesz/4);
	opal.entry = of_read_number(entryp, entrysz/4);

	pr_debug("OPAL Base = 0x%llx (basep=%p basesz=%ld)\n",
	opal.base, basep, basesz);
	pr_debug("OPAL Entry = 0x%llx (entryp=%p basesz=%ld)\n",
	opal.entry, entryp, entrysz);

	powerpc_firmware_features \|= FW_FEATURE_OPAL;
	if (of_flat_dt_is_compatible(node, "ibm,opal-v2")) {
	powerpc_firmware_features \|= FW_FEATURE_OPALv2;
	printk("OPAL V2 detected !\n");
	} else {
	printk("OPAL V1 detected !\n");
	}

	/* Hookup some exception handlers. We use the fwnmi area at 0x7000
	* to provide the glue space to OPAL
	*/
	glue = 0x7000;
	opal_register_exception_handler(OPAL_MACHINE_CHECK_HANDLER,
	__pa(opal_mc_secondary_handler[0]),
	glue);
	glue += 128;
	opal_register_exception_handler(OPAL_HYPERVISOR_MAINTENANCE_HANDLER,
	0, glue);
	glue += 128;
	opal_register_exception_handler(OPAL_SOFTPATCH_HANDLER, 0, glue);

	return 1;
	}

	int opal_get_chars(uint32_t vtermno, char *buf, int count)
	{
	s64 len, rc;
	u64 evt;

	if (!opal.entry)
	return -ENODEV;
	opal_poll_events(&evt);
	if ((evt & OPAL_EVENT_CONSOLE_INPUT) == 0)
	return 0;
	len = count;
	rc = opal_console_read(vtermno, &len, buf);
	if (rc == OPAL_SUCCESS)
	return len;
	return 0;
	}

	int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
	{
	int written = 0;
	s64 len, rc;
	unsigned long flags;
	u64 evt;

	if (!opal.entry)
	return -ENODEV;

	/* We want put_chars to be atomic to avoid mangling of hvsi
	* packets. To do that, we first test for room and return
	* -EAGAIN if there isn't enough.
	*
	* Unfortunately, opal_console_write_buffer_space() doesn't
	* appear to work on opal v1, so we just assume there is
	* enough room and be done with it
	*/
	spin_lock_irqsave(&opal_write_lock, flags);
	if (firmware_has_feature(FW_FEATURE_OPALv2)) {
	rc = opal_console_write_buffer_space(vtermno, &len);
	if (rc \|\| len < total_len) {
	spin_unlock_irqrestore(&opal_write_lock, flags);
	/* Closed -> drop characters */
	if (rc)
	return total_len;
	opal_poll_events(&evt);
	return -EAGAIN;
	}
	}

	/* We still try to handle partial completions, though they
	* should no longer happen.
	*/
	rc = OPAL_BUSY;
	while(total_len > 0 && (rc == OPAL_BUSY \|\|
	rc == OPAL_BUSY_EVENT \|\| rc == OPAL_SUCCESS)) {
	len = total_len;
	rc = opal_console_write(vtermno, &len, data);
	if (rc == OPAL_SUCCESS) {
	total_len -= len;
	data += len;
	written += len;
	}
	/* This is a bit nasty but we need that for the console to
	* flush when there aren't any interrupts. We will clean
	* things a bit later to limit that to synchronous path
	* such as the kernel console and xmon/udbg
	*/
	do
	opal_poll_events(&evt);
	while(rc == OPAL_SUCCESS && (evt & OPAL_EVENT_CONSOLE_OUTPUT));
	}
	spin_unlock_irqrestore(&opal_write_lock, flags);
	return written;
	}

	int opal_machine_check(struct pt_regs *regs)
	{
	struct opal_machine_check_event *opal_evt = get_paca()->opal_mc_evt;
	struct opal_machine_check_event evt;
	const char level, sevstr, *subtype;
	static const char *opal_mc_ue_types[] = {
	"Indeterminate",
	"Instruction fetch",
	"Page table walk ifetch",
	"Load/Store",
	"Page table walk Load/Store",
	};
	static const char *opal_mc_slb_types[] = {
	"Indeterminate",
	"Parity",
	"Multihit",
	};
	static const char *opal_mc_erat_types[] = {
	"Indeterminate",
	"Parity",
	"Multihit",
	};
	static const char *opal_mc_tlb_types[] = {
	"Indeterminate",
	"Parity",
	"Multihit",
	};

	/* Copy the event structure and release the original */
	evt = *opal_evt;
	opal_evt->in_use = 0;

	/* Print things out */
	if (evt.version != OpalMCE_V1) {
	pr_err("Machine Check Exception, Unknown event version %d !\n",
	evt.version);
	return 0;
	}
	switch(evt.severity) {
	case OpalMCE_SEV_NO_ERROR:
	level = KERN_INFO;
	sevstr = "Harmless";
	break;
	case OpalMCE_SEV_WARNING:
	level = KERN_WARNING;
	sevstr = "";
	break;
	case OpalMCE_SEV_ERROR_SYNC:
	level = KERN_ERR;
	sevstr = "Severe";
	break;
	case OpalMCE_SEV_FATAL:
	default:
	level = KERN_ERR;
	sevstr = "Fatal";
	break;
	}

	printk("%s%s Machine check interrupt [%s]\n", level, sevstr,
	evt.disposition == OpalMCE_DISPOSITION_RECOVERED ?
	"Recovered" : "[Not recovered");
	printk("%s Initiator: %s\n", level,
	evt.initiator == OpalMCE_INITIATOR_CPU ? "CPU" : "Unknown");
	switch(evt.error_type) {
	case OpalMCE_ERROR_TYPE_UE:
	subtype = evt.u.ue_error.ue_error_type <
	ARRAY_SIZE(opal_mc_ue_types) ?
	opal_mc_ue_types[evt.u.ue_error.ue_error_type]
	: "Unknown";
	printk("%s Error type: UE [%s]\n", level, subtype);
	if (evt.u.ue_error.effective_address_provided)
	printk("%s Effective address: %016llx\n",
	level, evt.u.ue_error.effective_address);
	if (evt.u.ue_error.physical_address_provided)
	printk("%s Physial address: %016llx\n",
	level, evt.u.ue_error.physical_address);
	break;
	case OpalMCE_ERROR_TYPE_SLB:
	subtype = evt.u.slb_error.slb_error_type <
	ARRAY_SIZE(opal_mc_slb_types) ?
	opal_mc_slb_types[evt.u.slb_error.slb_error_type]
	: "Unknown";
	printk("%s Error type: SLB [%s]\n", level, subtype);
	if (evt.u.slb_error.effective_address_provided)
	printk("%s Effective address: %016llx\n",
	level, evt.u.slb_error.effective_address);
	break;
	case OpalMCE_ERROR_TYPE_ERAT:
	subtype = evt.u.erat_error.erat_error_type <
	ARRAY_SIZE(opal_mc_erat_types) ?
	opal_mc_erat_types[evt.u.erat_error.erat_error_type]
	: "Unknown";
	printk("%s Error type: ERAT [%s]\n", level, subtype);
	if (evt.u.erat_error.effective_address_provided)
	printk("%s Effective address: %016llx\n",
	level, evt.u.erat_error.effective_address);
	break;
	case OpalMCE_ERROR_TYPE_TLB:
	subtype = evt.u.tlb_error.tlb_error_type <
	ARRAY_SIZE(opal_mc_tlb_types) ?
	opal_mc_tlb_types[evt.u.tlb_error.tlb_error_type]
	: "Unknown";
	printk("%s Error type: TLB [%s]\n", level, subtype);
	if (evt.u.tlb_error.effective_address_provided)
	printk("%s Effective address: %016llx\n",
	level, evt.u.tlb_error.effective_address);
	break;
	default:
	case OpalMCE_ERROR_TYPE_UNKNOWN:
	printk("%s Error type: Unknown\n", level);
	break;
	}
	return evt.severity == OpalMCE_SEV_FATAL ? 0 : 1;
	}

	static irqreturn_t opal_interrupt(int irq, void *data)
	{
	uint64_t events;

	opal_handle_interrupt(virq_to_hw(irq), &events);

	/* XXX TODO: Do something with the events */

	return IRQ_HANDLED;
	}

	static int __init opal_init(void)
	{
	struct device_node np, consoles;
	const u32 *irqs;
	int rc, i, irqlen;

	opal_node = of_find_node_by_path("/ibm,opal");
	if (!opal_node) {
	pr_warn("opal: Node not found\n");
	return -ENODEV;
	}
	if (firmware_has_feature(FW_FEATURE_OPALv2))
	consoles = of_find_node_by_path("/ibm,opal/consoles");
	else
	consoles = of_node_get(opal_node);

	/* Register serial ports */
	for_each_child_of_node(consoles, np) {
	if (strcmp(np->name, "serial"))
	continue;
	of_platform_device_create(np, NULL, NULL);
	}
	of_node_put(consoles);

	/* Find all OPAL interrupts and request them */
	irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
	pr_debug("opal: Found %d interrupts reserved for OPAL\n",
	irqs ? (irqlen / 4) : 0);
	for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
	unsigned int hwirq = be32_to_cpup(irqs);
	unsigned int irq = irq_create_mapping(NULL, hwirq);
	if (irq == NO_IRQ) {
	pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
	continue;
	}
	rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
	if (rc)
	pr_warning("opal: Error %d requesting irq %d"
	" (0x%x)\n", rc, irq, hwirq);
	}
	return 0;
	}
	subsys_initcall(opal_init);