Re: [PATCH 08/57] microblaze_v7: Interrupt handling, timer support, selfmod code

[Michal Simek <monstr@monstr.eu>]

Thomas Gleixner wrote:
> On Fri, 20 Mar 2009, Michal Simek wrote:
>>> 2) a clock event device which has CLOCK_EVT_FEAT_PERIODIC flag set.
>> You meant ONESHOT feature, right?
> 
> Sure :)
>  
>> # cat /proc/timer_list
>> Timer List Version: v0.4
>> HRTIMER_MAX_CLOCK_BASES: 2
>> now at 17205889582 nsecs
>>
>> cpu: 0
>>  clock 0:
>>   .base:       9027a4d0
>>   .index:      0
>>   .resolution: 1 nsecs
>>   .get_time:   ktime_get_real
>>   .offset:     0 nsecs
>> active timers:
>>  clock 1:
>>   .base:       9027a4fc
>>   .index:      1
>>   .resolution: 1 nsecs
>>   .get_time:   ktime_get
>>   .offset:     0 nsecs
>> active timers:
>>  #0: per_cpu__tick_cpu_sched, tick_sched_timer, S:01, <800005a6>, swapper/1
>>  # expires at 17210000000-17210000000 nsecs [in 4110418 to 4110418 nsecs]
>>  #1: <9f2d3a48>, hrtimer_wakeup, S:01, <9f2d3a48>, inetd/54
>>  # expires at 17430563969-17431563926 nsecs [in 224674387 to 225674344 nsecs]
>>  #2: <9e127a48>, hrtimer_wakeup, S:01, <9e127a48>, thttpd/50
>>  # expires at 129748538823-129848538823 nsecs [in 112542649241 to 112642649241
>> nsecs]
>>   .expires_next   : 17210000000 nsecs
>>   .hres_active    : 1
> 
> Looks good. Now you can enable CONFIG_NOHZ as well. :) That needs just
> the following extras in your idle loop:
> 
> -->             tick_nohz_stop_sched_tick(1);
> 	        while (!need_resched())
> 		        idle();
> -->	        tick_nohz_restart_sched_tick();
> 

Yes, it is already in cpu_idle function. ->arch/microblaze/kernel/process.c file
Seems that work too. Look below. I am going to take a look at __do_IRQ issue.


Thanks,
Michal


> Thanks,
> 
> 	tglx

early_printk_console is enabled at 0x84000000
Ramdisk addr 0x90c80040, FDT 0x90780000
Found romfs @ 0x90c80040 (0x001bf000)
#### klimit 902f7000 ####
Moving 0x001bf000 bytes from 0x90c80040 to 0x902f62ac
New klimit: 0x904b6000
Found FDT at 0x90780000
Linux version 2.6.29-rc8-00473-g1219507-dirty (monstr@monstr.eu) (gcc version
3.4.1 ( PetaLinux 0.20 Build -rc1 050607 )) #51 Fri Mar 20 12:56:11 CET 2009
setup_cpuinfo: initialising
setup_cpuinfo: Using full CPU PVR support
setup_memory: Main mem: 0x90000000-0xa0000000, size 0x10000000
setup_memory: kernel addr=0x90000000-0x904b6000 size=0x004b6000
setup_memory: max_mapnr: 0x10000
setup_memory: min_low_pfn: 0x90000
setup_memory: max_low_pfn: 0xa0000
On node 0 totalpages: 65536
free_area_init_node: node 0, pgdat 902852f4, node_mem_map 904b6000
  Normal zone: 512 pages used for memmap
  Normal zone: 0 pages reserved
  Normal zone: 65024 pages, LIFO batch:15
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
Kernel command line: console=ttyUL0,115200 highres=on
xlnx,xps-intc-1.00.a #0 at 0x81800000, num_irq=9, edge=0x100
PID hash table entries: 1024 (order: 10, 4096 bytes)
xlnx,xps-timer-1.00.a #0 at 0x83c00000, irq=3
Heartbeat GPIO at 0x81400000
microblaze_timer_set_mode: shutdown
microblaze_timer_set_mode: periodic
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 254848k/262144k available
ODEBUG: selftest passed
Calibrating delay loop... 61.44 BogoMIPS (lpj=307200)
Mount-cache hash table entries: 512
net_namespace: 544 bytes
NET: Registered protocol family 16
bio: create slab <bio-0> at 0
microblaze_timer_set_mode: oneshot
Switched to high resolution mode on CPU 0
NET: Registered protocol family 2
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
NET: Registered protocol family 1
msgmni has been set to 498
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
84000000.serial: ttyUL0 at MMIO 0x84000003 (irq = 8) is a uartlite
console [ttyUL0] enabled
brd: module loaded
nbd: registered device at major 43
uclinux[mtd]: RAM probe address=0x902f62ac size=0x1bf000
Creating 1 MTD partitions on "RAM":
0x000000000000-0x0000001bf000 : "ROMfs"
uclinux[mtd]: set ROMfs to be root filesystem index=0
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
VFS: Mounted root (romfs filesystem) readonly on device 31:0.
Freeing unused kernel memory: 96k freed
Mounting proc:
Mounting var:
Populating /var:
Running local start scripts.
Mounting /etc/config:
Populating /etc/config:
flatfsd: Nonexistent or bad flatfs (-48), creating new one...
flatfsd: Failed to write flatfs (-48): No such device
flatfsd: Created 6 configuration files (310 bytes)
Mounting sysfs:
Setting hostname:
Setting up interface lo:
Setting up interface eth0:
SIOCSIFADDR: No such device
Starting thttpd:

uclinux login: root
Password:
# ls
bin   dev   etc   home  lib   mnt   proc  sys   tmp   usr   var
# uptime
 00:00:19 up 0 min, load average: 0.21, 0.04, 0.01
# uptime
 00:00:20 up 0 min, load average: 0.19, 0.04, 0.01
# uptime
 00:00:21 up 0 min, load average: 0.19, 0.04, 0.01
# gunzip < /proc/config.gz
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.29-rc8
# Fri Mar 20 12:52:15 2009
#
CONFIG_MICROBLAZE=y
# CONFIG_SWAP is not set
CONFIG_RWSEM_GENERIC_SPINLOCK=y
# CONFIG_ARCH_HAS_ILOG2_U32 is not set
# CONFIG_ARCH_HAS_ILOG2_U64 is not set
CONFIG_GENERIC_FIND_NEXT_BIT=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_GENERIC_HARDIRQS=y
CONFIG_GENERIC_IRQ_PROBE=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_GENERIC_TIME=y
# CONFIG_GENERIC_TIME_VSYSCALL is not set
CONFIG_GENERIC_CLOCKEVENTS=y
# CONFIG_PCI is not set
# CONFIG_NO_DMA is not set


...

#
# Processor type and features
#
CONFIG_TICK_ONESHOT=y
CONFIG_NO_HZ=y
CONFIG_HIGH_RES_TIMERS=y
CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set
CONFIG_HZ_100=y
# CONFIG_HZ_250 is not set
# CONFIG_HZ_300 is not set
# CONFIG_HZ_1000 is not set
CONFIG_HZ=100
CONFIG_SCHED_HRTICK=y