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[ Upstream commit 429a9671f235c94fc4b5d6687308714b74adc820 ]
At unwind_start(), it is better to get its frame info here rather than
get them outside, even we don't have 'regs'. In this way we can simply
use unwind_{start, next_frame, done} outside.
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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If a kernel thread is created by a user thread, it may carry FPU/SIMD
thread info flags (TIF_USEDFPU, TIF_USEDSIMD, etc.). Then it will be
considered as a fpu owner and kernel try to save its FPU/SIMD context
and cause such errors:
[ 41.518931] do_fpu invoked from kernel context![#1]:
[ 41.523933] CPU: 1 PID: 395 Comm: iou-wrk-394 Not tainted 6.1.0-rc5+ #217
[ 41.530757] Hardware name: Loongson Loongson-3A5000-7A1000-1w-CRB/Loongson-LS3A5000-7A1000-1w-CRB, BIOS vUDK2018-LoongArch-V2.0.pre-beta8 08/18/2022
[ 41.544064] $ 0 : 0000000000000000 90000000011e9468 9000000106c7c000 9000000106c7fcf0
[ 41.552101] $ 4 : 9000000106305d40 9000000106689800 9000000106c7fd08 0000000003995818
[ 41.560138] $ 8 : 0000000000000001 90000000009a72e4 0000000000000020 fffffffffffffffc
[ 41.568174] $12 : 0000000000000000 0000000000000000 0000000000000020 00000009aab7e130
[ 41.576211] $16 : 00000000000001ff 0000000000000407 0000000000000001 0000000000000000
[ 41.584247] $20 : 0000000000000000 0000000000000001 9000000106c7fd70 90000001002f0400
[ 41.592284] $24 : 0000000000000000 900000000178f740 90000000011e9834 90000001063057c0
[ 41.600320] $28 : 0000000000000000 0000000000000001 9000000006826b40 9000000106305140
[ 41.608356] era : 9000000000228848 _save_fp+0x0/0xd8
[ 41.613542] ra : 90000000011e9468 __schedule+0x568/0x8d0
[ 41.619160] CSR crmd: 000000b0
[ 41.619163] CSR prmd: 00000000
[ 41.622359] CSR euen: 00000000
[ 41.625558] CSR ecfg: 00071c1c
[ 41.628756] CSR estat: 000f0000
[ 41.635239] ExcCode : f (SubCode 0)
[ 41.638783] PrId : 0014c010 (Loongson-64bit)
[ 41.643191] Modules linked in: acpi_ipmi vfat fat ipmi_si ipmi_devintf cfg80211 ipmi_msghandler rfkill fuse efivarfs
[ 41.653734] Process iou-wrk-394 (pid: 395, threadinfo=0000000004ebe913, task=00000000636fa1be)
[ 41.662375] Stack : 00000000ffff0875 9000000006800ec0 9000000006800ec0 90000000002d57e0
[ 41.670412] 0000000000000001 0000000000000000 9000000106535880 0000000000000001
[ 41.678450] 9000000105291800 0000000000000000 9000000105291838 900000000178e000
[ 41.686487] 9000000106c7fd90 9000000106305140 0000000000000001 90000000011e9834
[ 41.694523] 00000000ffff0875 90000000011f034c 9000000105291838 9000000105291830
[ 41.702561] 0000000000000000 9000000006801440 00000000ffff0875 90000000002d48c0
[ 41.710597] 9000000128800001 9000000106305140 9000000105291838 9000000105291838
[ 41.718634] 9000000105291830 9000000107811740 9000000105291848 90000000009bf1e0
[ 41.726672] 9000000105291830 9000000107811748 2d6b72772d756f69 0000000000343933
[ 41.734708] 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 41.742745] ...
[ 41.745252] Call Trace:
[ 42.197868] [<9000000000228848>] _save_fp+0x0/0xd8
[ 42.205214] [<90000000011ed468>] __schedule+0x568/0x8d0
[ 42.210485] [<90000000011ed834>] schedule+0x64/0xd4
[ 42.215411] [<90000000011f434c>] schedule_timeout+0x88/0x188
[ 42.221115] [<90000000009c36d0>] io_wqe_worker+0x184/0x350
[ 42.226645] [<9000000000221cf0>] ret_from_kernel_thread+0xc/0x9c
This can be easily triggered by ltp testcase syscalls/io_uring02 and it
can also be easily fixed by clearing the FPU/SIMD thread info flags for
kernel threads in copy_thread().
Cc: stable@vger.kernel.org
Reported-by: Qi Hu <huqi@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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The current LoongArch kernel stack is padded as if obeying the MIPS o32
calling convention (32 bytes), signifying the port's MIPS lineage but no
longer making sense. Remove the padding for clarity.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Rather than incurring a division or requesting too many random bytes for
the given range, use the prandom_u32_max() function, which only takes
the minimum required bytes from the RNG and avoids divisions. This was
done mechanically with this coccinelle script:
@basic@
expression E;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u64;
@@
(
- ((T)get_random_u32() % (E))
+ prandom_u32_max(E)
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- ((T)get_random_u32() & ((E) - 1))
+ prandom_u32_max(E * XXX_MAKE_SURE_E_IS_POW2)
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- ((u64)(E) * get_random_u32() >> 32)
+ prandom_u32_max(E)
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- ((T)get_random_u32() & ~PAGE_MASK)
+ prandom_u32_max(PAGE_SIZE)
)
@multi_line@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
identifier RAND;
expression E;
@@
- RAND = get_random_u32();
... when != RAND
- RAND %= (E);
+ RAND = prandom_u32_max(E);
// Find a potential literal
@literal_mask@
expression LITERAL;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
position p;
@@
((T)get_random_u32()@p & (LITERAL))
// Add one to the literal.
@script:python add_one@
literal << literal_mask.LITERAL;
RESULT;
@@
value = None
if literal.startswith('0x'):
value = int(literal, 16)
elif literal[0] in '123456789':
value = int(literal, 10)
if value is None:
print("I don't know how to handle %s" % (literal))
cocci.include_match(False)
elif value == 2**32 - 1 or value == 2**31 - 1 or value == 2**24 - 1 or value == 2**16 - 1 or value == 2**8 - 1:
print("Skipping 0x%x for cleanup elsewhere" % (value))
cocci.include_match(False)
elif value & (value + 1) != 0:
print("Skipping 0x%x because it's not a power of two minus one" % (value))
cocci.include_match(False)
elif literal.startswith('0x'):
coccinelle.RESULT = cocci.make_expr("0x%x" % (value + 1))
else:
coccinelle.RESULT = cocci.make_expr("%d" % (value + 1))
// Replace the literal mask with the calculated result.
@plus_one@
expression literal_mask.LITERAL;
position literal_mask.p;
expression add_one.RESULT;
identifier FUNC;
@@
- (FUNC()@p & (LITERAL))
+ prandom_u32_max(RESULT)
@collapse_ret@
type T;
identifier VAR;
expression E;
@@
{
- T VAR;
- VAR = (E);
- return VAR;
+ return E;
}
@drop_var@
type T;
identifier VAR;
@@
{
- T VAR;
... when != VAR
}
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: KP Singh <kpsingh@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 and sbitmap
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> # for drbd
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc
Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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1. Use common arch_stack_walk() infrastructure to avoid duplicated code
and avoid taking care of the stack storage and filtering.
2. Add sched_ra (means sched return address) and sched_cfa (means sched
call frame address) to thread_info, and store them in switch_to().
3. Add __get_wchan() implementation.
Now we can print the process stack and wait channel by cat /proc/*/stack
and /proc/*/wchan.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Name "guess unwinder" comes from x86, it scans the stack and reports
every kernel text address it finds.
Unwinders can be used by dump_stack() and other stacktrace functions.
Three stages when we do unwind,
1) unwind_start(), the prapare of unwinding, fill unwind_state.
2) unwind_done(), judge whether the unwind process is finished or not.
3) unwind_next_frame(), unwind the next frame.
Add get_stack_info() to get stack info. At present we have irq stack and
task stack. The next_sp is the key info between two types of stacks.
Dividing unwinder helps to add new unwinders in the future.
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Commit c5febea0956fd387 ("fork: Pass struct kernel_clone_args into
copy_thread") change the prototype of copy_thread(), while commit
5bd2e97c868a8a44 ("fork: Generalize PF_IO_WORKER handling") change
the structure of kernel_clone_args. They cause build errors, so fix it.
Fixes: 5bd2e97c868a8a44 ("fork: Generalize PF_IO_WORKER handling")
Fixes: c5febea0956fd387 ("fork: Pass struct kernel_clone_args into copy_thread")
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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LoongArch-based procesors have 4, 8 or 16 cores per package. This patch
adds multi-processor (SMP) support for LoongArch.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add process management support for LoongArch, including: thread info
definition, context switch and process tracing.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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