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authorPaul Mackerras <paulus@samba.org>2006-03-27 21:48:57 +1100
committerPaul Mackerras <paulus@samba.org>2006-03-27 21:48:57 +1100
commit9618edab82fda8dbce5ea3abcdac9ded07abb2d4 (patch)
tree8edacdcf4d0ecdd8a7b5b0f88f3cf68c393afbc5 /arch/powerpc/platforms/chrp
parentd0cc0dfa2dcf18854144b16a74502bd25c4eaedf (diff)
downloadop-kernel-dev-9618edab82fda8dbce5ea3abcdac9ded07abb2d4.zip
op-kernel-dev-9618edab82fda8dbce5ea3abcdac9ded07abb2d4.tar.gz
powerpc: Fix event-scan code for 32-bit CHRP
On CHRP machines we are supposed to call into firmware (RTAS) periodically, to give it a chance to check for errors and other events. Under ppc we had some special code in timer_interrupt to do this, but that didn't get transferred over to arch/powerpc. Instead, we use an array of timer_list structs, one per CPU, and use add_timer_on to make sure each one gets called on the appropriate CPU. With this we can remove the heartbeat_* elements of the ppc_md struct. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/chrp')
-rw-r--r--arch/powerpc/platforms/chrp/chrp.h2
-rw-r--r--arch/powerpc/platforms/chrp/setup.c64
2 files changed, 46 insertions, 20 deletions
diff --git a/arch/powerpc/platforms/chrp/chrp.h b/arch/powerpc/platforms/chrp/chrp.h
index 814f547..63f0aee 100644
--- a/arch/powerpc/platforms/chrp/chrp.h
+++ b/arch/powerpc/platforms/chrp/chrp.h
@@ -8,4 +8,4 @@ extern int chrp_set_rtc_time(struct rtc_time *);
extern long chrp_time_init(void);
extern void chrp_find_bridges(void);
-extern void chrp_event_scan(void);
+extern void chrp_event_scan(unsigned long);
diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index 8bf4307..9c718bb 100644
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -35,6 +35,7 @@
#include <linux/root_dev.h>
#include <linux/initrd.h>
#include <linux/module.h>
+#include <linux/timer.h>
#include <asm/io.h>
#include <asm/pgtable.h>
@@ -61,6 +62,10 @@ EXPORT_SYMBOL(_chrp_type);
struct mpic *chrp_mpic;
+/* Used for doing CHRP event-scans */
+DEFINE_PER_CPU(struct timer_list, heartbeat_timer);
+unsigned long event_scan_interval;
+
/*
* XXX this should be in xmon.h, but putting it there means xmon.h
* has to include <linux/interrupt.h> (to get irqreturn_t), which
@@ -229,8 +234,6 @@ void __init chrp_setup_arch(void)
{
struct device_node *root = find_path_device ("/");
char *machine = NULL;
- struct device_node *device;
- unsigned int *p = NULL;
/* init to some ~sane value until calibrate_delay() runs */
loops_per_jiffy = 50000000/HZ;
@@ -287,21 +290,6 @@ void __init chrp_setup_arch(void)
*/
sio_init();
- /* Get the event scan rate for the rtas so we know how
- * often it expects a heartbeat. -- Cort
- */
- device = find_devices("rtas");
- if (device)
- p = (unsigned int *) get_property
- (device, "rtas-event-scan-rate", NULL);
- if (p && *p) {
- ppc_md.heartbeat = chrp_event_scan;
- ppc_md.heartbeat_reset = HZ / (*p * 30) - 1;
- ppc_md.heartbeat_count = 1;
- printk("RTAS Event Scan Rate: %u (%lu jiffies)\n",
- *p, ppc_md.heartbeat_reset);
- }
-
pci_create_OF_bus_map();
/*
@@ -312,7 +300,7 @@ void __init chrp_setup_arch(void)
}
void
-chrp_event_scan(void)
+chrp_event_scan(unsigned long unused)
{
unsigned char log[1024];
int ret = 0;
@@ -320,7 +308,8 @@ chrp_event_scan(void)
/* 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);
- ppc_md.heartbeat_count = ppc_md.heartbeat_reset;
+ mod_timer(&__get_cpu_var(heartbeat_timer),
+ jiffies + event_scan_interval);
}
/*
@@ -465,6 +454,9 @@ void __init chrp_init_IRQ(void)
void __init
chrp_init2(void)
{
+ struct device_node *device;
+ unsigned int *p = NULL;
+
#ifdef CONFIG_NVRAM
chrp_nvram_init();
#endif
@@ -476,6 +468,40 @@ 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 = find_devices("rtas");
+ if (device)
+ p = (unsigned int *) 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);
+ }
+
if (ppc_md.progress)
ppc_md.progress(" Have fun! ", 0x7777);
}
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