[PATCH v9 1/6] arm64: Add macros to manage processor debug state

[Vijay Kilari]

On Mon, Feb 17, 2014 at 6:31 PM, Catalin Marinas
<catalin.marinas at arm.com> wrote:
> On Mon, Feb 17, 2014 at 12:21:45PM +0000, Vijay Kilari wrote:
>>    If it is ok, can you please merge these patches
>
> I was about to merge them but I wanted to try first. Enabling kgd tests
> at boot time, I get plenty of failures as below. Have you successfully
> run the kgdb tests?
>

  I re-tested v9 version patches with our internal arm64 simulator and
I don't see these warnings. Also I tested with 3.13 kernel from linaro with v8
foundation model and no errors are seen (logs below).

kgdb: Registered I/O driver kgdbts.
kgdbts:RUN plant and detach test
kgdbts:RUN sw breakpoint test
kgdbts:RUN bad memory access test
kgdbts:RUN singlestep test 1000 iterations
kgdbts:RUN singlestep [0/1000]
kgdbts:RUN singlestep [100/1000]
kgdbts:RUN singlestep [200/1000]
kgdbts:RUN singlestep [300/1000]
kgdbts:RUN singlestep [400/1000]
kgdbts:RUN singlestep [500/1000]
kgdbts:RUN singlestep [600/1000]
kgdbts:RUN singlestep [700/1000]
kgdbts:RUN singlestep [800/1000]
kgdbts:RUN singlestep [900/1000]
kgdbts:RUN do_fork for 100 breakpoints
smc91x 1a000000.ethernet (unregistered net_device): smc91x: IOADDR
ffffff800006a000 doesn't match configuration (300).
.....
EXT4-fs (vda2): re-mounted. Opts: (null)
random: dd urandom read with 13 bits of entropy available
kgdb: Unregistered I/O driver kgdbts, debugger disabled.
smc91x 1a000000.ethernet eth0: link up, 10Mbps, half-duplex, lpa 0x0000
rpcbind: cannot create socket for udp6
rpcbind: cannot create socket for tcp6

Last login: Wed Feb  5 09:32:00 UTC 2014 on tty1
root at genericarmv8:~# uname -a
Linux genericarmv8 3.13.0+ #2 SMP PREEMPT Tue Feb 18 15:53:10 IST 2014
aarch64 GNU/Linux
root at genericarmv8:~#

NOTE: Please check if you have applied all the latest version patches

> kgdbts:RUN singlestep [800/1000]
> kgdbts: ERROR PUT: end of test buffer on 'singlestep_breakpoint_test' line 0 expected S0* got $T05thread:01;#07
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 1 at /work/Linux/linux-2.6-aarch64/drivers/misc/kgdbts.c:815 run_simple_test+0x28c/0x2d8()
> Modules linked in:
> CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W    3.14.0-rc3+ #300
> Call trace:
> [<ffffffc000087dbc>] dump_backtrace+0x0/0x12c
> [<ffffffc000087efc>] show_stack+0x14/0x1c
> [<ffffffc00044582c>] dump_stack+0x78/0xc4
> [<ffffffc00009552c>] warn_slowpath_common+0x88/0xac
> [<ffffffc000095618>] warn_slowpath_null+0x18/0x20
> [<ffffffc0002f5cb0>] run_simple_test+0x28c/0x2d8
> [<ffffffc0002f5268>] kgdbts_put_char+0x24/0x2c
> [<ffffffc0000fcdf8>] put_packet+0xa0/0x118
> [<ffffffc0000fe0e0>] gdb_serial_stub+0xb4c/0xd20
> [<ffffffc0000fc434>] kgdb_cpu_enter+0x3bc/0x5f4
> [<ffffffc0000fc934>] kgdb_handle_exception+0x18c/0x1f0
> [<ffffffc000090d50>] kgdb_compiled_brk_fn+0x2c/0x38
> [<ffffffc000082158>] brk_handler+0x8c/0xc4
> [<ffffffc0000811ec>] do_debug_exception+0x40/0xac
> Exception stack(0xffffffc876cbbb80 to 0xffffffc876cbbca0)
> bb80: 006a0000 ffffffc0 000003e8 00000000 76cbbd40 ffffffc8 000fb9b8 ffffffc0
> bba0: 000002c0 00000000 000d18cc ffffffc0 76cbbc10 ffffffc8 000d1c40 ffffffc0
> bbc0: 00641000 ffffffc0 00000001 00000000 00610d40 ffffffc0 00000006 00000000
> bbe0: 00000240 00000000 00000020 00000000 00000000 00000000 00000000 00000000
> bc00: 76cbbc10 ffffffc8 00000021 00000000 76cbbcb0 ffffffc8 0044337c ffffffc0
> bc20: 00648e58 ffffffc0 00000001 00000000 00000000 00000000 00648e60 ffffffc0
> bc40: 000070e1 00000000 00000006 00000000 00000030 00000000 006431b0 ffffffc0
> bc60: 000070e0 00000000 00000006 00000000 0000006c 00000000 00007005 00000000
> bc80: 00000040 00000000 00003648 00000000 00000000 00000000 00000006 00000000
> [<ffffffc000083cb4>] el1_dbg+0x18/0x68
> [<ffffffc0005d010c>] init_kgdbts+0x24/0x2c
> [<ffffffc000081430>] do_one_initcall+0xdc/0x124
> [<ffffffc0005b8930>] kernel_init_freeable+0x138/0x1d8
> [<ffffffc000440850>] kernel_init+0x10/0xd4
>
> --
> Catalin