powerpc/chrp: Use the same RTAS daemon as pSeries

The CHRP code has some fishy timer based code to scan the RTAS event
log, which uses a 1KB stack buffer and doesn't even use the results.

The pSeries code as a nicer daemon that allows userspace to read the
event log and basically uses the same RTAS interface

This patch moves rtasd.c out of platform/pseries and makes it usable
by CHRP, after removing the old crufty event log mechanism in there.

The nvram logging part of the daemon is still only available on 64-bit
since the underlying nvram management routines aren't currently shared.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

3 files changed, 2 insertions, 520 deletions

diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index f0e6f28427bd..26a24bd92623 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -4,6 +4,7 @@ config PPC_PSERIES
 	select MPIC
 	select PPC_I8259
 	select PPC_RTAS
+	select PPC_RTAS_DAEMON
 	select RTAS_ERROR_LOGGING
 	select PPC_UDBG_16550
 	select PPC_NATIVE
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 790c0b872d4f..4b1c422b8145 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -7,7 +7,7 @@ EXTRA_CFLAGS		+= -DDEBUG
 endif
 
 obj-y			:= lpar.o hvCall.o nvram.o reconfig.o \
-			   setup.o iommu.o ras.o rtasd.o \
+			   setup.o iommu.o ras.o \
 			   firmware.o power.o
 obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_XICS)	+= xics.o
diff --git a/arch/powerpc/platforms/pseries/rtasd.c b/arch/powerpc/platforms/pseries/rtasd.c
deleted file mode 100644
index b3cbac855924..000000000000
--- a/arch/powerpc/platforms/pseries/rtasd.c
+++ /dev/null
@@ -1,519 +0,0 @@
-/*
- * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
- *
- * 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.
- *
- * Communication to userspace based on kernel/printk.c
- */
-
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/poll.h>
-#include <linux/proc_fs.h>
-#include <linux/init.h>
-#include <linux/vmalloc.h>
-#include <linux/spinlock.h>
-#include <linux/cpu.h>
-#include <linux/workqueue.h>
-
-#include <asm/uaccess.h>
-#include <asm/io.h>
-#include <asm/rtas.h>
-#include <asm/prom.h>
-#include <asm/nvram.h>
-#include <asm/atomic.h>
-#include <asm/machdep.h>
-
-
-static DEFINE_SPINLOCK(rtasd_log_lock);
-
-static DECLARE_WAIT_QUEUE_HEAD(rtas_log_wait);
-
-static char *rtas_log_buf;
-static unsigned long rtas_log_start;
-static unsigned long rtas_log_size;
-
-static int surveillance_timeout = -1;
-static unsigned int rtas_error_log_max;
-static unsigned int rtas_error_log_buffer_max;
-
-/* RTAS service tokens */
-static unsigned int event_scan;
-static unsigned int rtas_event_scan_rate;
-
-static int full_rtas_msgs = 0;
-
-/* Stop logging to nvram after first fatal error */
-static int logging_enabled; /* Until we initialize everything,
-                             * make sure we don't try logging
-                             * anything */
-static int error_log_cnt;
-
-/*
- * Since we use 32 bit RTAS, the physical address of this must be below
- * 4G or else bad things happen. Allocate this in the kernel data and
- * make it big enough.
- */
-static unsigned char logdata[RTAS_ERROR_LOG_MAX];
-
-static char *rtas_type[] = {
-	"Unknown", "Retry", "TCE Error", "Internal Device Failure",
-	"Timeout", "Data Parity", "Address Parity", "Cache Parity",
-	"Address Invalid", "ECC Uncorrected", "ECC Corrupted",
-};
-
-static char *rtas_event_type(int type)
-{
-	if ((type > 0) && (type < 11))
-		return rtas_type[type];
-
-	switch (type) {
-		case RTAS_TYPE_EPOW:
-			return "EPOW";
-		case RTAS_TYPE_PLATFORM:
-			return "Platform Error";
-		case RTAS_TYPE_IO:
-			return "I/O Event";
-		case RTAS_TYPE_INFO:
-			return "Platform Information Event";
-		case RTAS_TYPE_DEALLOC:
-			return "Resource Deallocation Event";
-		case RTAS_TYPE_DUMP:
-			return "Dump Notification Event";
-	}
-
-	return rtas_type[0];
-}
-
-/* To see this info, grep RTAS /var/log/messages and each entry
- * will be collected together with obvious begin/end.
- * There will be a unique identifier on the begin and end lines.
- * This will persist across reboots.
- *
- * format of error logs returned from RTAS:
- * bytes	(size)	: contents
- * --------------------------------------------------------
- * 0-7		(8)	: rtas_error_log
- * 8-47		(40)	: extended info
- * 48-51	(4)	: vendor id
- * 52-1023 (vendor specific) : location code and debug data
- */
-static void printk_log_rtas(char *buf, int len)
-{
-
-	int i,j,n = 0;
-	int perline = 16;
-	char buffer[64];
-	char * str = "RTAS event";
-
-	if (full_rtas_msgs) {
-		printk(RTAS_DEBUG "%d -------- %s begin --------\n",
-		       error_log_cnt, str);
-
-		/*
-		 * Print perline bytes on each line, each line will start
-		 * with RTAS and a changing number, so syslogd will
-		 * print lines that are otherwise the same.  Separate every
-		 * 4 bytes with a space.
-		 */
-		for (i = 0; i < len; i++) {
-			j = i % perline;
-			if (j == 0) {
-				memset(buffer, 0, sizeof(buffer));
-				n = sprintf(buffer, "RTAS %d:", i/perline);
-			}
-
-			if ((i % 4) == 0)
-				n += sprintf(buffer+n, " ");
-
-			n += sprintf(buffer+n, "%02x", (unsigned char)buf[i]);
-
-			if (j == (perline-1))
-				printk(KERN_DEBUG "%s\n", buffer);
-		}
-		if ((i % perline) != 0)
-			printk(KERN_DEBUG "%s\n", buffer);
-
-		printk(RTAS_DEBUG "%d -------- %s end ----------\n",
-		       error_log_cnt, str);
-	} else {
-		struct rtas_error_log *errlog = (struct rtas_error_log *)buf;
-
-		printk(RTAS_DEBUG "event: %d, Type: %s, Severity: %d\n",
-		       error_log_cnt, rtas_event_type(errlog->type),
-		       errlog->severity);
-	}
-}
-
-static int log_rtas_len(char * buf)
-{
-	int len;
-	struct rtas_error_log *err;
-
-	/* rtas fixed header */
-	len = 8;
-	err = (struct rtas_error_log *)buf;
-	if (err->extended_log_length) {
-
-		/* extended header */
-		len += err->extended_log_length;
-	}
-
-	if (rtas_error_log_max == 0)
-		rtas_error_log_max = rtas_get_error_log_max();
-
-	if (len > rtas_error_log_max)
-		len = rtas_error_log_max;
-
-	return len;
-}
-
-/*
- * First write to nvram, if fatal error, that is the only
- * place we log the info.  The error will be picked up
- * on the next reboot by rtasd.  If not fatal, run the
- * method for the type of error.  Currently, only RTAS
- * errors have methods implemented, but in the future
- * there might be a need to store data in nvram before a
- * call to panic().
- *
- * XXX We write to nvram periodically, to indicate error has
- * been written and sync'd, but there is a possibility
- * that if we don't shutdown correctly, a duplicate error
- * record will be created on next reboot.
- */
-void pSeries_log_error(char *buf, unsigned int err_type, int fatal)
-{
-	unsigned long offset;
-	unsigned long s;
-	int len = 0;
-
-	pr_debug("rtasd: logging event\n");
-	if (buf == NULL)
-		return;
-
-	spin_lock_irqsave(&rtasd_log_lock, s);
-
-	/* get length and increase count */
-	switch (err_type & ERR_TYPE_MASK) {
-	case ERR_TYPE_RTAS_LOG:
-		len = log_rtas_len(buf);
-		if (!(err_type & ERR_FLAG_BOOT))
-			error_log_cnt++;
-		break;
-	case ERR_TYPE_KERNEL_PANIC:
-	default:
-		WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
-		spin_unlock_irqrestore(&rtasd_log_lock, s);
-		return;
-	}
-
-	/* Write error to NVRAM */
-	if (logging_enabled && !(err_type & ERR_FLAG_BOOT))
-		nvram_write_error_log(buf, len, err_type, error_log_cnt);
-
-	/*
-	 * rtas errors can occur during boot, and we do want to capture
-	 * those somewhere, even if nvram isn't ready (why not?), and even
-	 * if rtasd isn't ready. Put them into the boot log, at least.
-	 */
-	if ((err_type & ERR_TYPE_MASK) == ERR_TYPE_RTAS_LOG)
-		printk_log_rtas(buf, len);
-
-	/* Check to see if we need to or have stopped logging */
-	if (fatal || !logging_enabled) {
-		logging_enabled = 0;
-		WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
-		spin_unlock_irqrestore(&rtasd_log_lock, s);
-		return;
-	}
-
-	/* call type specific method for error */
-	switch (err_type & ERR_TYPE_MASK) {
-	case ERR_TYPE_RTAS_LOG:
-		offset = rtas_error_log_buffer_max *
-			((rtas_log_start+rtas_log_size) & LOG_NUMBER_MASK);
-
-		/* First copy over sequence number */
-		memcpy(&rtas_log_buf[offset], (void *) &error_log_cnt, sizeof(int));
-
-		/* Second copy over error log data */
-		offset += sizeof(int);
-		memcpy(&rtas_log_buf[offset], buf, len);
-
-		if (rtas_log_size < LOG_NUMBER)
-			rtas_log_size += 1;
-		else
-			rtas_log_start += 1;
-
-		WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
-		spin_unlock_irqrestore(&rtasd_log_lock, s);
-		wake_up_interruptible(&rtas_log_wait);
-		break;
-	case ERR_TYPE_KERNEL_PANIC:
-	default:
-		WARN_ON_ONCE(!irqs_disabled()); /* @@@ DEBUG @@@ */
-		spin_unlock_irqrestore(&rtasd_log_lock, s);
-		return;
-	}
-
-}
-
-
-static int rtas_log_open(struct inode * inode, struct file * file)
-{
-	return 0;
-}
-
-static int rtas_log_release(struct inode * inode, struct file * file)
-{
-	return 0;
-}
-
-/* This will check if all events are logged, if they are then, we
- * know that we can safely clear the events in NVRAM.
- * Next we'll sit and wait for something else to log.
- */
-static ssize_t rtas_log_read(struct file * file, char __user * buf,
-			 size_t count, loff_t *ppos)
-{
-	int error;
-	char *tmp;
-	unsigned long s;
-	unsigned long offset;
-
-	if (!buf || count < rtas_error_log_buffer_max)
-		return -EINVAL;
-
-	count = rtas_error_log_buffer_max;
-
-	if (!access_ok(VERIFY_WRITE, buf, count))
-		return -EFAULT;
-
-	tmp = kmalloc(count, GFP_KERNEL);
-	if (!tmp)
-		return -ENOMEM;
-
-	spin_lock_irqsave(&rtasd_log_lock, s);
-	/* if it's 0, then we know we got the last one (the one in NVRAM) */
-	while (rtas_log_size == 0) {
-		if (file->f_flags & O_NONBLOCK) {
-			spin_unlock_irqrestore(&rtasd_log_lock, s);
-			error = -EAGAIN;
-			goto out;
-		}
-
-		if (!logging_enabled) {
-			spin_unlock_irqrestore(&rtasd_log_lock, s);
-			error = -ENODATA;
-			goto out;
-		}
-		nvram_clear_error_log();
-
-		spin_unlock_irqrestore(&rtasd_log_lock, s);
-		error = wait_event_interruptible(rtas_log_wait, rtas_log_size);
-		if (error)
-			goto out;
-		spin_lock_irqsave(&rtasd_log_lock, s);
-	}
-
-	offset = rtas_error_log_buffer_max * (rtas_log_start & LOG_NUMBER_MASK);
-	memcpy(tmp, &rtas_log_buf[offset], count);
-
-	rtas_log_start += 1;
-	rtas_log_size -= 1;
-	spin_unlock_irqrestore(&rtasd_log_lock, s);
-
-	error = copy_to_user(buf, tmp, count) ? -EFAULT : count;
-out:
-	kfree(tmp);
-	return error;
-}
-
-static unsigned int rtas_log_poll(struct file *file, poll_table * wait)
-{
-	poll_wait(file, &rtas_log_wait, wait);
-	if (rtas_log_size)
-		return POLLIN | POLLRDNORM;
-	return 0;
-}
-
-static const struct file_operations proc_rtas_log_operations = {
-	.read =		rtas_log_read,
-	.poll =		rtas_log_poll,
-	.open =		rtas_log_open,
-	.release =	rtas_log_release,
-};
-
-static int enable_surveillance(int timeout)
-{
-	int error;
-
-	error = rtas_set_indicator(SURVEILLANCE_TOKEN, 0, timeout);
-
-	if (error == 0)
-		return 0;
-
-	if (error == -EINVAL) {
-		printk(KERN_DEBUG "rtasd: surveillance not supported\n");
-		return 0;
-	}
-
-	printk(KERN_ERR "rtasd: could not update surveillance\n");
-	return -1;
-}
-
-static void do_event_scan(void)
-{
-	int error;
-	do {
-		memset(logdata, 0, rtas_error_log_max);
-		error = rtas_call(event_scan, 4, 1, NULL,
-				  RTAS_EVENT_SCAN_ALL_EVENTS, 0,
-				  __pa(logdata), rtas_error_log_max);
-		if (error == -1) {
-			printk(KERN_ERR "event-scan failed\n");
-			break;
-		}
-
-		if (error == 0)
-			pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0);
-
-	} while(error == 0);
-}
-
-static void rtas_event_scan(struct work_struct *w);
-DECLARE_DELAYED_WORK(event_scan_work, rtas_event_scan);
-
-/*
- * Delay should be at least one second since some machines have problems if
- * we call event-scan too quickly.
- */
-static unsigned long event_scan_delay = 1*HZ;
-static int first_pass = 1;
-
-static void rtas_event_scan(struct work_struct *w)
-{
-	unsigned int cpu;
-
-	do_event_scan();
-
-	get_online_cpus();
-
-	cpu = next_cpu(smp_processor_id(), cpu_online_map);
-	if (cpu == NR_CPUS) {
-		cpu = first_cpu(cpu_online_map);
-
-		if (first_pass) {
-			first_pass = 0;
-			event_scan_delay = 30*HZ/rtas_event_scan_rate;
-
-			if (surveillance_timeout != -1) {
-				pr_debug("rtasd: enabling surveillance\n");
-				enable_surveillance(surveillance_timeout);
-				pr_debug("rtasd: surveillance enabled\n");
-			}
-		}
-	}
-
-	schedule_delayed_work_on(cpu, &event_scan_work,
-		__round_jiffies_relative(event_scan_delay, cpu));
-
-	put_online_cpus();
-}
-
-static void start_event_scan(void)
-{
-	unsigned int err_type;
-	int rc;
-
-	printk(KERN_DEBUG "RTAS daemon started\n");
-	pr_debug("rtasd: will sleep for %d milliseconds\n",
-		 (30000 / rtas_event_scan_rate));
-
-	/* See if we have any error stored in NVRAM */
-	memset(logdata, 0, rtas_error_log_max);
-	rc = nvram_read_error_log(logdata, rtas_error_log_max,
-	                          &err_type, &error_log_cnt);
-	/* We can use rtas_log_buf now */
-	logging_enabled = 1;
-
-	if (!rc) {
-		if (err_type != ERR_FLAG_ALREADY_LOGGED) {
-			pSeries_log_error(logdata, err_type | ERR_FLAG_BOOT, 0);
-		}
-	}
-
-	schedule_delayed_work_on(first_cpu(cpu_online_map), &event_scan_work,
-				 event_scan_delay);
-}
-
-static int __init rtas_init(void)
-{
-	struct proc_dir_entry *entry;
-
-	if (!machine_is(pseries))
-		return 0;
-
-	/* No RTAS */
-	event_scan = rtas_token("event-scan");
-	if (event_scan == RTAS_UNKNOWN_SERVICE) {
-		printk(KERN_DEBUG "rtasd: no event-scan on system\n");
-		return -ENODEV;
-	}
-
-	rtas_event_scan_rate = rtas_token("rtas-event-scan-rate");
-	if (rtas_event_scan_rate == RTAS_UNKNOWN_SERVICE) {
-		printk(KERN_ERR "rtasd: no rtas-event-scan-rate on system\n");
-		return -ENODEV;
-	}
-
-	/* Make room for the sequence number */
-	rtas_error_log_max = rtas_get_error_log_max();
-	rtas_error_log_buffer_max = rtas_error_log_max + sizeof(int);
-
-	rtas_log_buf = vmalloc(rtas_error_log_buffer_max*LOG_NUMBER);
-	if (!rtas_log_buf) {
-		printk(KERN_ERR "rtasd: no memory\n");
-		return -ENOMEM;
-	}
-
-	entry = proc_create("ppc64/rtas/error_log", S_IRUSR, NULL,
-			    &proc_rtas_log_operations);
-	if (!entry)
-		printk(KERN_ERR "Failed to create error_log proc entry\n");
-
-	start_event_scan();
-
-	return 0;
-}
-
-static int __init surveillance_setup(char *str)
-{
-	int i;
-
-	if (get_option(&str,&i)) {
-		if (i >= 0 && i <= 255)
-			surveillance_timeout = i;
-	}
-
-	return 1;
-}
-
-static int __init rtasmsgs_setup(char *str)
-{
-	if (strcmp(str, "on") == 0)
-		full_rtas_msgs = 1;
-	else if (strcmp(str, "off") == 0)
-		full_rtas_msgs = 0;
-
-	return 1;
-}
-__initcall(rtas_init);
-__setup("surveillance=", surveillance_setup);
-__setup("rtasmsgs=", rtasmsgs_setup);