The device-tree properties no-need-l1d-flush-msr-pr-1-to-0,
no-need-l1d-flush-kernel-on-user-access and
no-need-store-drain-on-priv-state-switch are the equivalents of
H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY, H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS
and H_CPU_BEHAV_NO_STF_BARRIER from the H_GET_CPU_CHARACTERISTICS
On 21.03.22 19:27, Catalin Marinas wrote:
> On Mon, Mar 21, 2022 at 05:44:05PM +, Will Deacon wrote:
>> On Mon, Mar 21, 2022 at 04:07:48PM +0100, David Hildenbrand wrote:
>>> So the example you gave cannot possibly have that bit set. From what I
>>> understand, it should be fine. But I have no
On 3/22/22 03:09, Dan Williams wrote:
> On Fri, Mar 18, 2022 at 4:42 AM Kajol Jain wrote:
>>
>> The following build failure occures when CONFIG_PERF_EVENTS is not set
>> as generic pmu functions are not visible in that scenario.
>>
>> arch/powerpc/platforms/pseries/papr_scm.c:372:35: error: ‘st
On 3/22/22 07:15, Dan Williams wrote:
> On Mon, Mar 21, 2022 at 2:39 PM Dan Williams wrote:
>>
>> On Fri, Mar 18, 2022 at 4:42 AM Kajol Jain wrote:
>>>
>>> The following build failure occures when CONFIG_PERF_EVENTS is not set
>>> as generic pmu functions are not visible in that scenario.
>>>
From: Guo Ren
Currently, most 64-bit architectures (x86, parisc, powerpc, arm64,
s390, mips, sparc) have supported COMPAT mode. But they all have
history issues and can't use standard linux unistd.h. RISC-V would
be first standard __SYSCALL_COMPAT user of include/uapi/asm-generic
/unistd.h.
The
From: Christoph Hellwig
Don't bother to define the symbols empty, just don't use them.
That makes the intent a little more clear.
Remove the unused HAVE_ARCH_STRUCT_FLOCK64 define and merge the
32-bit mips struct flock into the generic one.
Add a new __ARCH_FLOCK_EXTRA_SYSID macro following the
From: Christoph Hellwig
The F_GETLK64/F_SETLK64/F_SETLKW64 fcntl opcodes are only implemented
for the 32-bit syscall APIs, but are also needed for compat handling
on 64-bit kernels.
Consolidate them in unistd.h instead of definining the internal compat
definitions in compat.h, which is rather er
From: Christoph Hellwig
Provide a single common definition for the compat_flock and
compat_flock64 structures using the same tricks as for the native
variants. Another extra define is added for the packing required on
x86.
Signed-off-by: Christoph Hellwig
Signed-off-by: Guo Ren
Reviewed-by: A
From: Guo Ren
The existing per-arch definitions are pretty much historic cruft.
Move SYSVIPC_COMPAT into init/Kconfig.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Acked-by: Arnd Bergmann
Reviewed-by: Christoph Hellwig
Tested-by: Heiko Stuebner
Cc: Palmer Dabbelt
---
arch/arm64/Kconfig
From: Guo Ren
RISC-V doesn't neeed compat_stat, so using __ARCH_WANT_COMPAT_STAT
to exclude unnecessary SYSCALL functions.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Arnd Bergmann
Reviewed-by: Christoph Hellwig
Tested-by: Heiko Stuebner
Cc: Palmer Dabbelt
---
arch/arm64/in
From: Guo Ren
There are 7 64bit architectures that support Linux COMPAT mode to
run 32bit applications. A lot of definitions are duplicate:
- COMPAT_USER_HZ
- COMPAT_RLIM_INFINITY
- COMPAT_OFF_T_MAX
- __compat_uid_t, __compat_uid_t
- compat_dev_t
- compat_ipc_pid_t
- struct compat_flock
-
From: Guo Ren
Make "uapi asm unistd.h" could be used for architectures' COMPAT
mode. The __SYSCALL_COMPAT is first used in riscv.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Arnd Bergmann
Reviewed-by: Christoph Hellwig
Tested-by: Heiko Stuebner
---
include/uapi/asm-generic/u
From: Guo Ren
Let's follow the origin patch's spirit:
The only difference between rv32_defconfig and defconfig is that
rv32_defconfig has CONFIG_ARCH_RV32I=y.
This is helpful to compare rv64-compat-rv32 v.s. rv32-linux.
Fixes: 1b937e8faa87ccfb ("RISC-V: Add separate defconfig for 32bit system
From: Guo Ren
Implement riscv asm/compat.h for struct compat_xxx,
is_compat_task, compat_user_regset, regset convert.
The rv64 compat.h has inherited most of the structs
from the generic one.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Tested-by: Heiko Stuebner
Cc: Arnd Bergmann
Cc: Palme
From: Guo Ren
Make TASK_SIZE from const to dynamic detect TIF_32BIT flag
function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for
efi-stub.
Limit 32-bit compatible process in 0-2GB virtual address range
(which is enough for real scenarios), because it could avoid
address sign extend probl
From: Guo Ren
Implement compat sys_call_table and some system call functions:
truncate64, ftruncate64, fallocate, pread64, pwrite64,
sync_file_range, readahead, fadvise64_64 which need argument
translation.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Arnd Bergmann
Tested-by: He
From: Guo Ren
Implement the entry of compat_sys_call_table[] in asm. Ref to
riscv-privileged spec 4.1.1 Supervisor Status Register (sstatus):
BIT[32:33] = UXL[1:0]:
- 1:32
- 2:64
- 3:128
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Palmer Dabbelt
Tested-by: Heiko Stuebner
From: Guo Ren
If the current task is in COMPAT mode, set SR_UXL_32 in status for
returning userspace. We need CONFIG _COMPAT to prevent compiling
errors with rv32 defconfig.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Tested-by: Heiko Stuebner
Cc: Arnd Bergmann
Cc: Palmer Dabbelt
---
arc
From: Guo Ren
Implement necessary type and macro for compat elf. See the code
comment for detail.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Arnd Bergmann
Tested-by: Heiko Stuebner
---
arch/riscv/include/asm/elf.h | 41 +++-
1 file changed, 40
From: Guo Ren
Detect hardware COMPAT (32bit U-mode) capability in rv64. If not
support COMPAT mode in hw, compat_elf_check_arch would return
false by compat_binfmt_elf.c
Add CLASS to enhance (compat_)elf_check_arch to distinguish
32BIT/64BIT elf.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
From: Guo Ren
There is no vgettimeofday supported in rv32 that makes simple to
generate rv32 vdso code which only needs riscv64 compiler. Other
architectures need change compiler or -m (machine parameter) to
support vdso32 compiling. If rv32 support vgettimeofday (which
cause C compile) in future
From: Guo Ren
Reconstruct __setup_additional_pages() by appending vdso info
pointer argument to meet compat_vdso_info requirement. And change
vm_special_mapping *dm, *cm initialization into static.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Palmer Dabbelt
Tested-by: Heiko Stue
From: Guo Ren
Implement compat_setup_rt_frame for sigcontext save & restore. The
main process is the same with signal, but the rv32 pt_regs' size
is different from rv64's, so we needs convert them.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Palmer Dabbelt
Tested-by: Heiko Stue
From: Guo Ren
Now, you can use native gdb on riscv64 for rv32 app debugging.
$ uname -a
Linux buildroot 5.16.0-rc4-00036-gbef6b82fdf23-dirty #53 SMP Mon Dec 20
23:06:53 CST 2021 riscv64 GNU/Linux
$ cat /proc/cpuinfo
processor : 0
hart: 0
isa : rv64imafdcsuh
mmu
From: Guo Ren
Adds initial skeletal COMPAT Kbuild (Running 32bit U-mode on
64bit S-mode) support.
- Setup kconfig & dummy functions for compiling.
- Implement compat_start_thread by the way.
Signed-off-by: Guo Ren
Signed-off-by: Guo Ren
Reviewed-by: Arnd Bergmann
Tested-by: Heiko Stuebner
This series reduces by 70% the time required to activate
ftrace on an 8xx with CONFIG_STRICT_KERNEL_RWX.
Measure is performed in function ftrace_replace_code() using mftb()
around the loop.
With the series,
- Without CONFIG_STRICT_KERNEL_RWX, 416000 TB ticks are measured.
- With CONFIG_STRICT_KER
It's only during early startup that poking_init() is not done yet,
for instance when calling ftrace_init().
Once poking_init() has been called there must be a poking area, no
need to check it everytime patch_instruction() is called.
ftrace activation time is reduced by 7% with the change on an 8x
If CONFIG_MODULES is not set, there is no point in checking
whether text is in module area.
This reduced the time needed to activate/deactivate ftrace
by more than 10% on an 8xx.
Signed-off-by: Christophe Leroy
---
arch/powerpc/lib/code-patching.c | 2 +-
1 file changed, 1 insertion(+), 1 delet
Once init is done, initmem is freed forever so no need to
test system_state at every call to patch_instruction().
Use jump_label.
This reduces by 2% the time needed to activate ftrace on an 8xx.
Signed-off-by: Christophe Leroy
---
arch/powerpc/include/asm/code-patching.h | 2 ++
arch/powerpc/l
Since commit 591b4b268435 ("powerpc/code-patching: Pre-map patch area")
the patch area is premapped so intermediate page tables are already
allocated.
Use __set_pte_at() directly instead of the heavy map_kernel_page(),
at for unmapping just do a pte_clear() followed by a flush.
__set_pte_at() can
On Tue, Mar 22, 2022 at 7:30 AM kajoljain wrote:
>
>
>
> On 3/22/22 03:09, Dan Williams wrote:
> > On Fri, Mar 18, 2022 at 4:42 AM Kajol Jain wrote:
> >>
> >> The following build failure occures when CONFIG_PERF_EVENTS is not set
> >> as generic pmu functions are not visible in that scenario.
> >
On Wed, Feb 23, 2022 at 01:02:10PM +0100, Christophe Leroy wrote:
> This series applies on top of my series "miscellanuous cleanups" v4.
Queued onto modules-testing! BTW I just had to rebase the change
with the kdb changes, it was a trivial change.
Luis
On Mon, Mar 21, 2022 at 2:22 AM Randy Dunlap wrote:
>
> Clean up some of admin-guide/kernel-parameters.txt:
>
> a. "smt" should be "smt=" (S390)
> b. add "smt-enabled" for POWERPC
> c. Sparc supports the vdso= boot option
> d. make the tp_printk options (2) formatting similar to other options
>
On 3/22/22 10:41, Rafael J. Wysocki wrote:
> On Mon, Mar 21, 2022 at 2:22 AM Randy Dunlap wrote:
>> Clean up some of admin-guide/kernel-parameters.txt:
>>
>> a. "smt" should be "smt=" (S390)
>> b. add "smt-enabled" for POWERPC
>> c. Sparc supports the vdso= boot option
>> d. make the tp_printk
The adapter request_limit is hardcoded to be INITIAL_SRP_LIMIT which is
currently an arbitrary value of 800. Increase this value to 1024 which
better matches the characteristics of the typical IBMi Initiator that
supports 32 LUNs and a queue depth of 32.
This change also has the secondary benefit
On Tue, 22 Mar 2022 07:39:43 PDT (-0700), guo...@kernel.org wrote:
From: Guo Ren
Currently, most 64-bit architectures (x86, parisc, powerpc, arm64,
s390, mips, sparc) have supported COMPAT mode. But they all have
history issues and can't use standard linux unistd.h. RISC-V would
be first standa
On 3/22/22 13:12, Michael Ellerman wrote:
Alexey Kardashevskiy writes:
So far the RELACOUNT tag from the ELF header was containing the exact
number of R_PPC_RELATIVE/R_PPC64_RELATIVE relocations. However the LLVM's
recent change [1] make it equal-or-less than the actual number which
makes it
Alexey Kardashevskiy writes:
> On 3/22/22 13:12, Michael Ellerman wrote:
>> Alexey Kardashevskiy writes:
>>> So far the RELACOUNT tag from the ELF header was containing the exact
>>> number of R_PPC_RELATIVE/R_PPC64_RELATIVE relocations. However the LLVM's
>>> recent change [1] make it equal-or-l
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