Commit 384a290283fde63ba8dc671fca5420111cdac19a seems to break 11MPCore boot

Punit Agrawal punit.agrawal at arm.com
Wed Jan 30 11:40:50 EST 2013 

Hi Lorenzo,


On 30/01/13 16:04, Lorenzo Pieralisi wrote:
> On Wed, Jan 30, 2013 at 03:23:55PM +0000, Punit Agrawal wrote:
>> Hi Nicolas,
>>
>> I was trying to boot 3.8-rc5 on Realview EB 11MPCore using realview-smp_defconfig as a starting point but the kernel failed to progress past the log below (config attached).
>>
>> Pawel suggested I try reverting 384a290283fde63ba8dc671fca5420111cdac19a - "ARM: gic: use a private mapping for CPU target interfaces" that you've authored. With this commit reverted the kernel boots.
>>
>> I am not quite sure why the commit breaks 11MPCore but Pawel (cc'd) might be able to shed light on that.
>
> I *think* it is because in the ARM11MPcore GIC
>
> dist_base + GIC_DIST_TARGET
>
> is RAZ for IT0-IT28. To give it a go you should change code in
>
> gic_cpu_init()
>
> and read (GIC_DIST_TARGET + 0x1c) (where IT29 starts)
>
> if I am not mistaken, since that will return the GIC CPU IF ID of the
> reading CPU.

With the following changes the kernel boots up further -

$ git diff
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 36ae03a..68f6368 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -400,8 +400,11 @@ static void __cpuinit gic_cpu_init(struct
gic_chip_data *gic)
          * Get what the GIC says our CPU mask is.
          */
         BUG_ON(cpu >= NR_GIC_CPU_IF);
-   cpu_mask = readl_relaxed(dist_base + GIC_DIST_TARGET + 0);
+ cpu_mask = readl_relaxed(dist_base + GIC_DIST_TARGET + 0x1c);
+ cpu_mask = (cpu_mask & 0xff00) >> 8;
+
         gic_cpu_map[cpu] = cpu_mask;
+ printk(KERN_INFO "cpu: %d, cpu_mask: 0x%08x\n", cpu, cpu_mask);

         /*
          * Clear our mask from the other map entries in case they're

But doesn't go all the way to init.

Bytes transferred = 2350832 (23def0 hex)
## Booting kernel from Legacy Image at 00007fc0 ...
    Image Name:   Linux-3.8.0-rc5-dirty
    Image Type:   ARM Linux Kernel Image (uncompressed)
    Data Size:    2350768 Bytes =  2.2 MB
    Load Address: 00008000
    Entry Point:  00008000
    Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Booting Linux on physical CPU 0x0
Linux version 3.8.0-rc5-dirty (punagr01 at e102309-lin) (gcc version 4.6.3
(Ubuntu/Linaro 4.6.3-1ubuntu5) ) #34 SMP Wed Jan 30 16:28:02 GMT 2013
CPU: ARMv6-compatible processor [410fb020] revision 0 (ARMv7), cr=00c5387d
CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
Machine: ARM-RealView EB
Ignoring unrecognised tag 0x00000000
bootconsole [earlycon0] enabled
Memory policy: ECC disabled, Data cache writealloc
sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 178956ms
PERCPU: Embedded 8 pages/cpu @c070b000 s9920 r8192 d14656 u32768
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
Kernel command line: root=/dev/nfs ip=dhcp console=ttyAMA0
nfsroot=10.1.193.144:/work/filesystems/11MPCore earlyprintk
PID hash table entries: 1024 (order: 0, 4096 bytes)
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
__ex_table already sorted, skipping sort
Memory: 256MB = 256MB total
Memory: 254596k/254596k available, 7548k reserved, 0K highmem
Virtual kernel memory layout:
     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
     vmalloc : 0xd0800000 - 0xff000000   ( 744 MB)
     lowmem  : 0xc0000000 - 0xd0000000   ( 256 MB)
     modules : 0xbf000000 - 0xc0000000   (  16 MB)
       .text : 0xc0008000 - 0xc0457d78   (4416 kB)
       .init : 0xc0458000 - 0xc048d6c0   ( 214 kB)
       .data : 0xc048e000 - 0xc04c8db0   ( 236 kB)
        .bss : 0xc04c8db0 - 0xc05076e8   ( 251 kB)
Hierarchical RCU implementation.
NR_IRQS:128
cpu: 0, cpu_mask: 0x00000001
------------[ cut here ]------------
WARNING: at arch/arm/common/gic.c:741 gic_init_bases+0x118/0x2ac()
Cannot allocate irq_descs @ IRQ96, assuming pre-allocated
Modules linked in:
[<c0015fd8>] (unwind_backtrace+0x0/0xfc) from [<c0327b44>]
(dump_stack+0x20/0x24)
[<c0327b44>] (dump_stack+0x20/0x24) from [<c001fe44>]
(warn_slowpath_common+0x5c/0x74)
[<c001fe44>] (warn_slowpath_common+0x5c/0x74) from [<c001ff18>]
(warn_slowpath_fmt+0x40/0x48)
[<c001ff18>] (warn_slowpath_fmt+0x40/0x48) from [<c045cfe0>]
(gic_init_bases+0x118/0x2ac)
[<c045cfe0>] (gic_init_bases+0x118/0x2ac) from [<c045d710>]
(gic_init_irq+0x78/0xc4)
[<c045d710>] (gic_init_irq+0x78/0xc4) from [<c04595dc>] (init_IRQ+0x1c/0x24)
[<c04595dc>] (init_IRQ+0x1c/0x24) from [<c045871c>]
(start_kernel+0x198/0x29c)
[<c045871c>] (start_kernel+0x198/0x29c) from [<00008078>] (0x8078)
---[ end trace 1b75b31a2719ed1c ]---
------------[ cut here ]------------
WARNING: at kernel/irq/irqdomain.c:234 irq_domain_add_legacy+0x84/0x144()
Modules linked in:
[<c0015fd8>] (unwind_backtrace+0x0/0xfc) from [<c0327b44>]
(dump_stack+0x20/0x24)
[<c0327b44>] (dump_stack+0x20/0x24) from [<c001fe44>]
(warn_slowpath_common+0x5c/0x74)
[<c001fe44>] (warn_slowpath_common+0x5c/0x74) from [<c001fe88>]
(warn_slowpath_null+0x2c/0x34)
[<c001fe88>] (warn_slowpath_null+0x2c/0x34) from [<c00757a4>]
(irq_domain_add_legacy+0x84/0x144)
[<c00757a4>] (irq_domain_add_legacy+0x84/0x144) from [<c045d000>]
(gic_init_bases+0x138/0x2ac)
[<c045d000>] (gic_init_bases+0x138/0x2ac) from [<c045d710>]
(gic_init_irq+0x78/0xc4)
[<c045d710>] (gic_init_irq+0x78/0xc4) from [<c04595dc>] (init_IRQ+0x1c/0x24)
[<c04595dc>] (init_IRQ+0x1c/0x24) from [<c045871c>]
(start_kernel+0x198/0x29c)
[<c045871c>] (start_kernel+0x198/0x29c) from [<00008078>] (0x8078)
---[ end trace 1b75b31a2719ed1d ]---
------------[ cut here ]------------
WARNING: at arch/arm/common/gic.c:746 gic_init_bases+0x150/0x2ac()
Modules linked in:
[<c0015fd8>] (unwind_backtrace+0x0/0xfc) from [<c0327b44>]
(dump_stack+0x20/0x24)
[<c0327b44>] (dump_stack+0x20/0x24) from [<c001fe44>]
(warn_slowpath_common+0x5c/0x74)
[<c001fe44>] (warn_slowpath_common+0x5c/0x74) from [<c001fe88>]
(warn_slowpath_null+0x2c/0x34)
[<c001fe88>] (warn_slowpath_null+0x2c/0x34) from [<c045d018>]
(gic_init_bases+0x150/0x2ac)
[<c045d018>] (gic_init_bases+0x150/0x2ac) from [<c045d710>]
(gic_init_irq+0x78/0xc4)
[<c045d710>] (gic_init_irq+0x78/0xc4) from [<c04595dc>] (init_IRQ+0x1c/0x24)
[<c04595dc>] (init_IRQ+0x1c/0x24) from [<c045871c>]
(start_kernel+0x198/0x29c)
[<c045871c>] (start_kernel+0x198/0x29c) from [<00008078>] (0x8078)
---[ end trace 1b75b31a2719ed1e ]---
Console: colour dummy device 80x30
Calibrating delay loop... 80.69 BogoMIPS (lpj=403456)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
ftrace: allocating 12715 entries in 38 pages
smp_twd: clock not found: -2
Calibrating local timer... 104.75MHz.
Setting up static identity map for 0x32d900 - 0x32d95c
CPU1: Booted secondary processor
cpu: 1, cpu_mask: 0x00000002
CPU2: Booted secondary processor
cpu: 2, cpu_mask: 0x00000004
CPU3: Booted secondary processor
cpu: 3, cpu_mask: 0x00000008
Brought up 4 CPUs
SMP: Total of 4 processors activated (330.75 BogoMIPS).
NET: Registered protocol family 16
DMA: preallocated 256 KiB pool for atomic coherent allocations
L2x0 series cache controller enabled
l2x0: 8 ways, CACHE_ID 0x00000080, AUX_CTRL 0x00790fff, Cache size:
1048576 B
Serial: AMBA PL011 UART driver
dev:uart0: ttyAMA0 at MMIO 0x10009000 (irq = 36) is a PL011 rev2
console [ttyAMA0] enabled, bootconsole disabled
console [ttyAMA0] enabled, bootconsole disabled
dev:uart1: ttyAMA1 at MMIO 0x1000a000 (irq = 37) is a PL011 rev2
dev:uart2: ttyAMA2 at MMIO 0x1000b000 (irq = 0) is a PL011 rev2
fpga:uart3: ttyAMA3 at MMIO 0x1000c000 (irq = 0) is a PL011 rev2
bio: create slab <bio-0> at 0
ssp-pl022 dev:ssp0: ARM PL022 driver, device ID: 0x00041022
pl022: mapped registers from 0x1000d000 to d0876000
ssp-pl022 dev:ssp0: probe - cannot get IRQ (-22)
ssp-pl022: probe of dev:ssp0 failed with error -22
Advanced Linux Sound Architecture Driver Initialized.
Switching to clocksource timer3
NET: Registered protocol family 2
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP: reno registered
UDP hash table entries: 256 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
NET: Registered protocol family 1
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
msgmni has been set to 497
io scheduler noop registered
io scheduler deadline registered (default)
clcd-pl11x dev:clcd: PL111 rev0 at 0x10020000


>
> Just guessing, hope it helps,
>
> Lorenzo
>
>>
>> I'd be happy to test a fix as I have the board on my desk for a bit.
>>
>> Thanks,
>>
>> Punit

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