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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>
This commit is contained in:
Benjamin Herrenschmidt 2009-09-24 19:30:05 +00:00
parent 188917e183
commit 3d541c4b7f
7 changed files with 44 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/kernel/Makefile
View File

@ -46,6 +46,7 @@ procfs-y := proc_powerpc.o
obj-$(CONFIG_PROC_FS) += $(procfs-y)
rtaspci-$(CONFIG_PPC64)-$(CONFIG_PCI) := rtas_pci.o
obj-$(CONFIG_PPC_RTAS) += rtas.o rtas-rtc.o $(rtaspci-y-y)
obj-$(CONFIG_PPC_RTAS_DAEMON) += rtasd.o
obj-$(CONFIG_RTAS_FLASH) += rtas_flash.o
obj-$(CONFIG_RTAS_PROC) += rtas-proc.o
obj-$(CONFIG_LPARCFG) += lparcfg.o

44
arch/powerpc/platforms/pseries/rtasd.c → arch/powerpc/kernel/rtasd.c
View File

@ -39,6 +39,7 @@ 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;
@ -213,9 +214,11 @@ void pSeries_log_error(char *buf, unsigned int err_type, int fatal)
return;
}
#ifdef CONFIG_PPC64
/* Write error to NVRAM */
if (logging_enabled && !(err_type & ERR_FLAG_BOOT))
nvram_write_error_log(buf, len, err_type, error_log_cnt);
#endif /* CONFIG_PPC64 */
/*
* rtas errors can occur during boot, and we do want to capture
@ -264,7 +267,6 @@ void pSeries_log_error(char *buf, unsigned int err_type, int fatal)
}
static int rtas_log_open(struct inode * inode, struct file * file)
{
return 0;
@ -300,6 +302,7 @@ static ssize_t rtas_log_read(struct file * file, char __user * buf,
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) {
@ -313,7 +316,9 @@ static ssize_t rtas_log_read(struct file * file, char __user * buf,
error = -ENODATA;
goto out;
}
#ifdef CONFIG_PPC64
nvram_clear_error_log();
#endif /* CONFIG_PPC64 */
spin_unlock_irqrestore(&rtasd_log_lock, s);
error = wait_event_interruptible(rtas_log_wait, rtas_log_size);
@ -427,27 +432,38 @@ static void rtas_event_scan(struct work_struct *w)
put_online_cpus();
}
static void start_event_scan(void)
#ifdef CONFIG_PPC64
static void retreive_nvram_error_log(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);
}
}
}
#else /* CONFIG_PPC64 */
static void retreive_nvram_error_log(void)
{
}
#endif /* CONFIG_PPC64 */
static void start_event_scan(void)
{
printk(KERN_DEBUG "RTAS daemon started\n");
pr_debug("rtasd: will sleep for %d milliseconds\n",
(30000 / rtas_event_scan_rate));
/* Retreive errors from nvram if any */
retreive_nvram_error_log();
schedule_delayed_work_on(first_cpu(cpu_online_map), &event_scan_work,
event_scan_delay);
@ -457,13 +473,13 @@ static int __init rtas_init(void)
{
struct proc_dir_entry *entry;
if (!machine_is(pseries))
if (!machine_is(pseries) && !machine_is(chrp))
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");
printk(KERN_INFO "rtasd: No event-scan on system\n");
return -ENODEV;
}
@ -483,7 +499,7 @@ static int __init rtas_init(void)
return -ENOMEM;
}
entry = proc_create("ppc64/rtas/error_log", S_IRUSR, NULL,
entry = proc_create("powerpc/rtas/error_log", S_IRUSR, NULL,
&proc_rtas_log_operations);
if (!entry)
printk(KERN_ERR "Failed to create error_log proc entry\n");
@ -492,11 +508,16 @@ static int __init rtas_init(void)
return 0;
}
__initcall(rtas_init);
static int __init surveillance_setup(char *str)
{
int i;
/* We only do surveillance on pseries */
if (!machine_is(pseries))
return 0;
if (get_option(&str,&i)) {
if (i >= 0 && i <= 255)
surveillance_timeout = i;
@ -504,6 +525,7 @@ static int __init surveillance_setup(char *str)
return 1;
}
__setup("surveillance=", surveillance_setup);
static int __init rtasmsgs_setup(char *str)
{
@ -514,6 +536,4 @@ static int __init rtasmsgs_setup(char *str)
return 1;
}
__initcall(rtas_init);
__setup("surveillance=", surveillance_setup);
__setup("rtasmsgs=", rtasmsgs_setup);

5
arch/powerpc/platforms/Kconfig
View File

@ -86,6 +86,11 @@ config RTAS_ERROR_LOGGING
depends on PPC_RTAS
default n
config PPC_RTAS_DAEMON
bool
depends on PPC_RTAS
default n
config RTAS_PROC
bool "Proc interface to RTAS"
depends on PPC_RTAS

2
arch/powerpc/platforms/chrp/Kconfig
View File

@ -5,6 +5,8 @@ config PPC_CHRP
select PPC_I8259
select PPC_INDIRECT_PCI
select PPC_RTAS
select PPC_RTAS_DAEMON
select RTAS_ERROR_LOGGING
select PPC_MPC106
select PPC_UDBG_16550
select PPC_NATIVE

50
arch/powerpc/platforms/chrp/setup.c
View File

@ -364,19 +364,6 @@ void __init chrp_setup_arch(void)
if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
}
void
chrp_event_scan(unsigned long unused)
{
unsigned char log[1024];
int ret = 0;
/* XXX: we should loop until the hardware says no more error logs -- Cort */
rtas_call(rtas_token("event-scan"), 4, 1, &ret, 0xffffffff, 0,
__pa(log), 1024);
mod_timer(&__get_cpu_var(heartbeat_timer),
jiffies + event_scan_interval);
}
static void chrp_8259_cascade(unsigned int irq, struct irq_desc *desc)
{
unsigned int cascade_irq = i8259_irq();
@ -568,9 +555,6 @@ void __init chrp_init_IRQ(void)
void __init
chrp_init2(void)
{
struct device_node *device;
const unsigned int *p = NULL;
#ifdef CONFIG_NVRAM
chrp_nvram_init();
#endif
@ -582,40 +566,6 @@ chrp_init2(void)
request_region(0x80,0x10,"dma page reg");
request_region(0xc0,0x20,"dma2");
/* Get the event scan rate for the rtas so we know how
* often it expects a heartbeat. -- Cort
*/
device = of_find_node_by_name(NULL, "rtas");
if (device)
p = of_get_property(device, "rtas-event-scan-rate", NULL);
if (p && *p) {
/*
* Arrange to call chrp_event_scan at least *p times
* per minute. We use 59 rather than 60 here so that
* the rate will be slightly higher than the minimum.
* This all assumes we don't do hotplug CPU on any
* machine that needs the event scans done.
*/
unsigned long interval, offset;
int cpu, ncpus;
struct timer_list *timer;
interval = HZ * 59 / *p;
offset = HZ;
ncpus = num_online_cpus();
event_scan_interval = ncpus * interval;
for (cpu = 0; cpu < ncpus; ++cpu) {
timer = &per_cpu(heartbeat_timer, cpu);
setup_timer(timer, chrp_event_scan, 0);
timer->expires = jiffies + offset;
add_timer_on(timer, cpu);
offset += interval;
}
printk("RTAS Event Scan Rate: %u (%lu jiffies)\n",
*p, interval);
}
of_node_put(device);
if (ppc_md.progress)
ppc_md.progress(" Have fun! ", 0x7777);
}

1
arch/powerpc/platforms/pseries/Kconfig
View File

@ -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

2
arch/powerpc/platforms/pseries/Makefile
View File

@ -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