* Re: [PATCH 01/13] sysctl: add new register_sysctl_subdir() helper
From: Eric W. Biederman @ 2020-05-29 12:40 UTC (permalink / raw)
To: Luis Chamberlain
Cc: jack, rafael, airlied, amir73il, clemens, dri-devel, joseph.qi,
sfr, mark, rdna, yzaikin, joonas.lahtinen, keescook, arnd,
intel-gfx, jani.nikula, julia.lawall, viro, rodrigo.vivi,
nixiaoming, vbabka, axboe, tytso, gregkh, linux-kernel, daniel,
akpm, linuxppc-dev, ocfs2-devel, jlbec
In-Reply-To: <20200529074108.16928-2-mcgrof@kernel.org>
Luis Chamberlain <mcgrof@kernel.org> writes:
> Often enough all we need to do is create a subdirectory so that
> we can stuff sysctls underneath it. However, *if* that directory
> was already created early on the boot sequence we really have no
> need to use the full boiler plate code for it, we can just use
> local variables to help us guide sysctl to place the new leaf files.
>
> So use a helper to do precisely this.
Reset restart. This is patch is total nonsense.
- You are using register_sysctl_table which as I believe I have
mentioned is a deprecated compatibility wrapper. The point of
spring house cleaning is to get off of the deprecated functions
isn't it?
- You are using the old nasty form for creating directories instead
of just passing in a path.
- None of this is even remotely necessary. The directories
are created automatically if you just register their entries.
Eric
^ permalink raw reply
* Re: [PATCH 01/13] sysctl: add new register_sysctl_subdir() helper
From: Eric W. Biederman @ 2020-05-29 12:42 UTC (permalink / raw)
To: Luis Chamberlain
Cc: jack, rafael, airlied, amir73il, clemens, dri-devel, joseph.qi,
sfr, mark, rdna, yzaikin, joonas.lahtinen, keescook, arnd,
intel-gfx, jani.nikula, julia.lawall, viro, rodrigo.vivi,
nixiaoming, vbabka, axboe, tytso, gregkh, linux-kernel, daniel,
akpm, linuxppc-dev, ocfs2-devel, jlbec
In-Reply-To: <87ftbiud6s.fsf@x220.int.ebiederm.org>
ebiederm@xmission.com (Eric W. Biederman) writes:
> Luis Chamberlain <mcgrof@kernel.org> writes:
>
>> Often enough all we need to do is create a subdirectory so that
>> we can stuff sysctls underneath it. However, *if* that directory
>> was already created early on the boot sequence we really have no
>> need to use the full boiler plate code for it, we can just use
>> local variables to help us guide sysctl to place the new leaf files.
>>
>> So use a helper to do precisely this.
>
> Reset restart. This is patch is total nonsense.
>
> - You are using register_sysctl_table which as I believe I have
> mentioned is a deprecated compatibility wrapper. The point of
> spring house cleaning is to get off of the deprecated functions
> isn't it?
>
> - You are using the old nasty form for creating directories instead
> of just passing in a path.
>
> - None of this is even remotely necessary. The directories
> are created automatically if you just register their entries.
Oh. *blink* The poor naming threw me off.
This is a clumsy and poorly named version of register_sysctl();
Yes. This change is totally unnecessary.
Eric
^ permalink raw reply
* Re: [PATCH 02/13] cdrom: use new sysctl subdir helper register_sysctl_subdir()
From: Eric W. Biederman @ 2020-05-29 12:46 UTC (permalink / raw)
To: Luis Chamberlain
Cc: jack, rafael, airlied, amir73il, clemens, dri-devel, joseph.qi,
sfr, mark, rdna, yzaikin, joonas.lahtinen, keescook, arnd,
intel-gfx, jani.nikula, julia.lawall, viro, rodrigo.vivi,
nixiaoming, vbabka, axboe, tytso, gregkh, linux-kernel, daniel,
akpm, linuxppc-dev, ocfs2-devel, jlbec
In-Reply-To: <20200529074108.16928-3-mcgrof@kernel.org>
Luis Chamberlain <mcgrof@kernel.org> writes:
> This simplifies the code considerably. The following coccinelle
With register_sysctl the code would read:
cdrom_sysctl_header = register_sysctl("dev/cdrom", cdrom_table);
Please go that direction. Thank you.
Eric
^ permalink raw reply
* Re: [PATCH 12/13] sysctl: add helper to register empty subdir
From: Eric W. Biederman @ 2020-05-29 13:03 UTC (permalink / raw)
To: Luis Chamberlain
Cc: jack, rafael, airlied, amir73il, clemens, dri-devel, joseph.qi,
sfr, mark, rdna, yzaikin, joonas.lahtinen, keescook, arnd,
intel-gfx, jani.nikula, julia.lawall, viro, rodrigo.vivi,
nixiaoming, vbabka, axboe, tytso, gregkh, linux-kernel, daniel,
akpm, linuxppc-dev, ocfs2-devel, jlbec
In-Reply-To: <20200529074108.16928-13-mcgrof@kernel.org>
Luis Chamberlain <mcgrof@kernel.org> writes:
> The way to create a subdirectory from the base set of directories
> is a bit obscure, so provide a helper which makes this clear, and
> also helps remove boiler plate code required to do this work.
I agreee calling:
register_sysctl("fs/binfmt_misc", sysctl_mount_point)
is a bit obscure but if you are going to make a wrapper
please make it the trivial one liner above.
Say something that looks like:
struct sysctl_header *register_sysctl_mount_point(const char *path)
{
return register_sysctl(path, sysctl_mount_point);
}
And yes please talk about a mount point and not an empty dir, as these
are permanently empty directories to serve as mount points. There are
some subtle but important permission checks this allows in the case of
unprivileged mounts.
Further code like this belong in proc_sysctl.c next to all of the code
it is related to so that it is easier to see how to refactor the code if
necessary.
Eric
>
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
> ---
> include/linux/sysctl.h | 7 +++++++
> kernel/sysctl.c | 16 +++++++++++++---
> 2 files changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
> index 33a471b56345..89c92390e6de 100644
> --- a/include/linux/sysctl.h
> +++ b/include/linux/sysctl.h
> @@ -208,6 +208,8 @@ extern void register_sysctl_init(const char *path, struct ctl_table *table,
> extern struct ctl_table_header *register_sysctl_subdir(const char *base,
> const char *subdir,
> struct ctl_table *table);
> +extern void register_sysctl_empty_subdir(const char *base, const char *subdir);
> +
> void do_sysctl_args(void);
>
> extern int pwrsw_enabled;
> @@ -231,6 +233,11 @@ inline struct ctl_table_header *register_sysctl_subdir(const char *base,
> return NULL;
> }
>
> +static inline void register_sysctl_empty_subdir(const char *base,
> + const char *subdir)
> +{
> +}
> +
> static inline struct ctl_table_header *register_sysctl_paths(
> const struct ctl_path *path, struct ctl_table *table)
> {
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index f9a35325d5d5..460532cd5ac8 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -3188,13 +3188,17 @@ struct ctl_table_header *register_sysctl_subdir(const char *base,
> { }
> };
>
> - if (!table->procname)
> + if (table != sysctl_mount_point && !table->procname)
> goto out;
>
> hdr = register_sysctl_table(base_table);
> if (unlikely(!hdr)) {
> - pr_err("failed when creating subdirectory sysctl %s/%s/%s\n",
> - base, subdir, table->procname);
> + if (table != sysctl_mount_point)
> + pr_err("failed when creating subdirectory sysctl %s/%s/%s\n",
> + base, subdir, table->procname);
> + else
> + pr_err("failed when creating empty subddirectory %s/%s\n",
> + base, subdir);
> goto out;
> }
> kmemleak_not_leak(hdr);
> @@ -3202,6 +3206,12 @@ struct ctl_table_header *register_sysctl_subdir(const char *base,
> return hdr;
> }
> EXPORT_SYMBOL_GPL(register_sysctl_subdir);
> +
> +void register_sysctl_empty_subdir(const char *base,
> + const char *subdir)
> +{
> + register_sysctl_subdir(base, subdir, sysctl_mount_point);
> +}
> #endif /* CONFIG_SYSCTL */
> /*
> * No sense putting this after each symbol definition, twice,
^ permalink raw reply
* Re: [Intel-gfx] [PATCH 06/13] ocfs2: use new sysctl subdir helper register_sysctl_subdir()
From: Kees Cook @ 2020-05-29 14:49 UTC (permalink / raw)
To: Luis Chamberlain
Cc: jack, rafael, airlied, amir73il, clemens, dri-devel, joseph.qi,
sfr, mark, rdna, yzaikin, arnd, intel-gfx, julia.lawall, jlbec,
nixiaoming, vbabka, axboe, tytso, gregkh, linux-kernel, ebiederm,
akpm, linuxppc-dev, ocfs2-devel, viro
In-Reply-To: <20200529114912.GC11244@42.do-not-panic.com>
On Fri, May 29, 2020 at 11:49:12AM +0000, Luis Chamberlain wrote:
> Yikes, sense, you're right. Nope, I left the random config tests to
> 0day. Will fix, thanks!
Yeah, I do the same for randconfig, but I always do an "allmodconfig"
build before sending stuff. It's a good smoke test.
--
Kees Cook
^ permalink raw reply
* Re: [PATCH] ASoC: fsl_asrc_dma: Fix dma_chan leak when config DMA channel failed
From: Mark Brown @ 2020-05-29 16:51 UTC (permalink / raw)
To: Xiyu Yang, Liam Girdwood, Takashi Iwai, Timur Tabi, linux-kernel,
Jaroslav Kysela, alsa-devel, linuxppc-dev, Xiubo Li,
Fabio Estevam, Nicolin Chen
Cc: Xin Tan, yuanxzhang, kjlu
In-Reply-To: <1590415966-52416-1-git-send-email-xiyuyang19@fudan.edu.cn>
On Mon, 25 May 2020 22:12:46 +0800, Xiyu Yang wrote:
> fsl_asrc_dma_hw_params() invokes dma_request_channel() or
> fsl_asrc_get_dma_channel(), which returns a reference of the specified
> dma_chan object to "pair->dma_chan[dir]" with increased refcnt.
>
> The reference counting issue happens in one exception handling path of
> fsl_asrc_dma_hw_params(). When config DMA channel failed for Back-End,
> the function forgets to decrease the refcnt increased by
> dma_request_channel() or fsl_asrc_get_dma_channel(), causing a refcnt
> leak.
>
> [...]
Applied to
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
Thanks!
[1/1] ASoC: fsl_asrc_dma: Fix dma_chan leak when config DMA channel failed
commit: 36124fb19f1ae68a500cd76a76d40c6e81bee346
All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.
Please add any relevant lists and maintainers to the CCs when replying
to this mail.
Thanks,
Mark
^ permalink raw reply
* [PATCH] powerpc/32s: Fix another build failure with CONFIG_PPC_KUAP_DEBUG
From: Christophe Leroy @ 2020-05-29 18:50 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman
Cc: linuxppc-dev, linux-kernel
From: Christophe Leroy <christophe.leroy@c-s.fr>
'thread' doesn't exist in kuap_check() macro.
Use 'current' instead.
Fixes: a68c31fc01ef ("powerpc/32s: Implement Kernel Userspace Access Protection")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/book3s/32/kup.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index db0a1c281587..668508c8a1b5 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -75,7 +75,7 @@
.macro kuap_check current, gpr
#ifdef CONFIG_PPC_KUAP_DEBUG
- lwz \gpr, KUAP(thread)
+ lwz \gpr, THREAD + KUAP(\current)
999: twnei \gpr, 0
EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE)
#endif
--
2.25.0
^ permalink raw reply related
* Re: [PATCH] powerpc/nvram: Replace kmalloc with kzalloc in the error message
From: Markus Elfring @ 2020-05-29 18:50 UTC (permalink / raw)
To: Michael Ellerman, Liao Pingfang, linuxppc-dev
Cc: Yi Wang, Tony Luck, Kees Cook, Wang Liang, Anton Vorontsov,
kernel-janitors, LKML, Colin Cross, Paul Mackerras, Xue Zhihong,
Greg Kroah-Hartman, Thomas Gleixner, Allison Randal
> Please just remove the message instead, it's a tiny allocation that's
> unlikely to ever fail, and the caller will print an error anyway.
How do you think about to take another look at a previous update suggestion
like the following?
powerpc/nvram: Delete three error messages for a failed memory allocation
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/00845261-8528-d011-d3b8-e9355a231d3a@users.sourceforge.net/
https://lore.kernel.org/linuxppc-dev/00845261-8528-d011-d3b8-e9355a231d3a@users.sourceforge.net/
https://lore.kernel.org/patchwork/patch/752720/
https://lkml.org/lkml/2017/1/19/537
Regards,
Markus
^ permalink raw reply
* Re: [PATCH] powerpc/32s: Fix another build failure with CONFIG_PPC_KUAP_DEBUG
From: Christophe Leroy @ 2020-05-29 18:53 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <5ce7982c72424eb3e7abf78063d454c38c42b343.1590778219.git.christophe.leroy@csgroup.eu>
Le 29/05/2020 à 20:50, Christophe Leroy a écrit :
> From: Christophe Leroy <christophe.leroy@c-s.fr>
>
> 'thread' doesn't exist in kuap_check() macro.
>
> Use 'current' instead.
>
> Fixes: a68c31fc01ef ("powerpc/32s: Implement Kernel Userspace Access Protection")
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Argh, can you drop this line ?
> Cc: stable@vger.kernel.org
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reported-by: kbuild test robot <lkp@intel.com>
> ---
> arch/powerpc/include/asm/book3s/32/kup.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
> index db0a1c281587..668508c8a1b5 100644
> --- a/arch/powerpc/include/asm/book3s/32/kup.h
> +++ b/arch/powerpc/include/asm/book3s/32/kup.h
> @@ -75,7 +75,7 @@
>
> .macro kuap_check current, gpr
> #ifdef CONFIG_PPC_KUAP_DEBUG
> - lwz \gpr, KUAP(thread)
> + lwz \gpr, THREAD + KUAP(\current)
> 999: twnei \gpr, 0
> EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE)
> #endif
>
^ permalink raw reply
* Re: [PATCH v8 0/8] powerpc: switch VDSO to C implementation
From: Christophe Leroy @ 2020-05-29 18:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, nathanl
Cc: linux-arch, arnd, linux-kernel, luto, tglx, vincenzo.frascino,
linuxppc-dev
In-Reply-To: <cover.1588079622.git.christophe.leroy@c-s.fr>
Hi Michael,
Le 28/04/2020 à 15:16, Christophe Leroy a écrit :
> This is the seventh version of a series to switch powerpc VDSO to
> generic C implementation.
>
> Main changes since v7 are:
> - Added gettime64 on PPC32
>
> This series applies on today's powerpc/merge branch.
>
> See the last patches for details on changes and performance.
Do you have any plans for this series ?
Even if you don't feel like merging it this cycle, I think patches 1 to
3 are worth it.
Christophe
>
> Christophe Leroy (8):
> powerpc/vdso64: Switch from __get_datapage() to get_datapage inline
> macro
> powerpc/vdso: Remove __kernel_datapage_offset and simplify
> __get_datapage()
> powerpc/vdso: Remove unused \tmp param in __get_datapage()
> powerpc/processor: Move cpu_relax() into asm/vdso/processor.h
> powerpc/vdso: Prepare for switching VDSO to generic C implementation.
> powerpc/vdso: Switch VDSO to generic C implementation.
> lib/vdso: force inlining of __cvdso_clock_gettime_common()
> powerpc/vdso: Provide __kernel_clock_gettime64() on vdso32
>
> arch/powerpc/Kconfig | 2 +
> arch/powerpc/include/asm/clocksource.h | 7 +
> arch/powerpc/include/asm/processor.h | 10 +-
> arch/powerpc/include/asm/vdso/clocksource.h | 7 +
> arch/powerpc/include/asm/vdso/gettimeofday.h | 175 +++++++++++
> arch/powerpc/include/asm/vdso/processor.h | 23 ++
> arch/powerpc/include/asm/vdso/vsyscall.h | 25 ++
> arch/powerpc/include/asm/vdso_datapage.h | 50 ++--
> arch/powerpc/kernel/asm-offsets.c | 49 +--
> arch/powerpc/kernel/time.c | 91 +-----
> arch/powerpc/kernel/vdso.c | 58 +---
> arch/powerpc/kernel/vdso32/Makefile | 32 +-
> arch/powerpc/kernel/vdso32/cacheflush.S | 2 +-
> arch/powerpc/kernel/vdso32/config-fake32.h | 34 +++
> arch/powerpc/kernel/vdso32/datapage.S | 7 +-
> arch/powerpc/kernel/vdso32/gettimeofday.S | 300 +------------------
> arch/powerpc/kernel/vdso32/vdso32.lds.S | 8 +-
> arch/powerpc/kernel/vdso32/vgettimeofday.c | 35 +++
> arch/powerpc/kernel/vdso64/Makefile | 23 +-
> arch/powerpc/kernel/vdso64/cacheflush.S | 9 +-
> arch/powerpc/kernel/vdso64/datapage.S | 31 +-
> arch/powerpc/kernel/vdso64/gettimeofday.S | 243 +--------------
> arch/powerpc/kernel/vdso64/vdso64.lds.S | 7 +-
> arch/powerpc/kernel/vdso64/vgettimeofday.c | 29 ++
> lib/vdso/gettimeofday.c | 2 +-
> 25 files changed, 460 insertions(+), 799 deletions(-)
> create mode 100644 arch/powerpc/include/asm/clocksource.h
> create mode 100644 arch/powerpc/include/asm/vdso/clocksource.h
> create mode 100644 arch/powerpc/include/asm/vdso/gettimeofday.h
> create mode 100644 arch/powerpc/include/asm/vdso/processor.h
> create mode 100644 arch/powerpc/include/asm/vdso/vsyscall.h
> create mode 100644 arch/powerpc/kernel/vdso32/config-fake32.h
> create mode 100644 arch/powerpc/kernel/vdso32/vgettimeofday.c
> create mode 100644 arch/powerpc/kernel/vdso64/vgettimeofday.c
>
^ permalink raw reply
* Re: [RFC PATCH 1/2] libnvdimm: Add prctl control for disabling synchronous fault support.
From: Dan Williams @ 2020-05-29 19:22 UTC (permalink / raw)
To: Aneesh Kumar K.V
Cc: Jan Kara, linux-nvdimm, jack, Jeff Moyer, Oliver O'Halloran,
Michal Suchánek, linuxppc-dev
In-Reply-To: <7e8ee9e3-4d4d-e4b9-913b-1c2448adc62a@linux.ibm.com>
On Fri, May 29, 2020 at 3:55 AM Aneesh Kumar K.V
<aneesh.kumar@linux.ibm.com> wrote:
>
> On 5/29/20 3:22 PM, Jan Kara wrote:
> > Hi!
> >
> > On Fri 29-05-20 15:07:31, Aneesh Kumar K.V wrote:
> >> Thanks Michal. I also missed Jeff in this email thread.
> >
> > And I think you'll also need some of the sched maintainers for the prctl
> > bits...
> >
> >> On 5/29/20 3:03 PM, Michal Suchánek wrote:
> >>> Adding Jan
> >>>
> >>> On Fri, May 29, 2020 at 11:11:39AM +0530, Aneesh Kumar K.V wrote:
> >>>> With POWER10, architecture is adding new pmem flush and sync instructions.
> >>>> The kernel should prevent the usage of MAP_SYNC if applications are not using
> >>>> the new instructions on newer hardware.
> >>>>
> >>>> This patch adds a prctl option MAP_SYNC_ENABLE that can be used to enable
> >>>> the usage of MAP_SYNC. The kernel config option is added to allow the user
> >>>> to control whether MAP_SYNC should be enabled by default or not.
> >>>>
> >>>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> > ...
> >>>> diff --git a/kernel/fork.c b/kernel/fork.c
> >>>> index 8c700f881d92..d5a9a363e81e 100644
> >>>> --- a/kernel/fork.c
> >>>> +++ b/kernel/fork.c
> >>>> @@ -963,6 +963,12 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock);
> >>>> static unsigned long default_dump_filter = MMF_DUMP_FILTER_DEFAULT;
> >>>> +#ifdef CONFIG_ARCH_MAP_SYNC_DISABLE
> >>>> +unsigned long default_map_sync_mask = MMF_DISABLE_MAP_SYNC_MASK;
> >>>> +#else
> >>>> +unsigned long default_map_sync_mask = 0;
> >>>> +#endif
> >>>> +
> >
> > I'm not sure CONFIG is really the right approach here. For a distro that would
> > basically mean to disable MAP_SYNC for all PPC kernels unless application
> > explicitly uses the right prctl. Shouldn't we rather initialize
> > default_map_sync_mask on boot based on whether the CPU we run on requires
> > new flush instructions or not? Otherwise the patch looks sensible.
> >
>
> yes that is correct. We ideally want to deny MAP_SYNC only w.r.t
> POWER10. But on a virtualized platform there is no easy way to detect
> that. We could ideally hook this into the nvdimm driver where we look at
> the new compat string ibm,persistent-memory-v2 and then disable MAP_SYNC
> if we find a device with the specific value.
>
> BTW with the recent changes I posted for the nvdimm driver, older kernel
> won't initialize persistent memory device on newer hardware. Newer
> hardware will present the device to OS with a different device tree
> compat string.
>
> My expectation w.r.t this patch was, Distro would want to mark
> CONFIG_ARCH_MAP_SYNC_DISABLE=n based on the different application
> certification. Otherwise application will have to end up calling the
> prctl(MMF_DISABLE_MAP_SYNC, 0) any way. If that is the case, should this
> be dependent on P10?
>
> With that I am wondering should we even have this patch? Can we expect
> userspace get updated to use new instruction?.
>
> With ppc64 we never had a real persistent memory device available for
> end user to try. The available persistent memory stack was using vPMEM
> which was presented as a volatile memory region for which there is no
> need to use any of the flush instructions. We could safely assume that
> as we get applications certified/verified for working with pmem device
> on ppc64, they would all be using the new instructions?
I think prctl is the wrong interface for this. I was thinking a sysfs
interface along the same lines as /sys/block/pmemX/dax/write_cache.
That attribute is toggling DAXDEV_WRITE_CACHE for the determination of
whether the platform or the kernel needs to handle cache flushing
relative to power loss. A similar attribute can be established for
DAXDEV_SYNC, it would simply default to off based on a configuration
time policy, but be dynamically changeable at runtime via sysfs.
These flags are device properties that affect the kernel and
userspace's handling of persistence.
^ permalink raw reply
* Re: [musl] ppc64le and 32-bit LE userland compatibility
From: Rich Felker @ 2020-05-29 19:24 UTC (permalink / raw)
To: Will Springer
Cc: libc-alpha, eery, daniel, musl, binutils, libc-dev, linuxppc-dev
In-Reply-To: <2047231.C4sosBPzcN@sheen>
On Fri, May 29, 2020 at 07:03:48PM +0000, Will Springer wrote:
> The next problem concerns the ABI more directly. The failure mode was `file`
> surfacing EINVAL from pread64 when invoked on an ELF; pread64 was passed a
> garbage value for `pos`, which didn't appear to be caused by anything in
> `file`. Initially it seemed as though the 32-bit components of the arg were
> getting swapped, and we made hacky fixes to glibc and musl to put them in the
> "right order"; however, we weren't sure if that was the correct approach, or
> if there were knock-on effects we didn't know about. So we found the relevant
> compat code path in the kernel, at arch/powerpc/kernel/sys_ppc32.c, where
> there exists this comment:
>
> > /*
> > * long long munging:
> > * The 32 bit ABI passes long longs in an odd even register pair.
> > */
>
> It seems that the opposite is true in LE mode, and something is expecting long
> longs to start on an even register. I realized this after I tried swapping hi/
> lo `u32`s here and didn't see an improvement. I whipped up a patch [6] that
> switches which syscalls use padding arguments depending on endianness, while
> hopefully remaining tidy enough to be unobtrusive. (I took some liberties with
> variable names/types so that the macro could be consistent.)
The argument passing for pread/pwrite is historically a mess and
differs between archs. musl has a dedicated macro that archs can
define to override it. But it looks like it should match regardless of
BE vs LE, and musl already defines it for powerpc with the default
definition, adding a zero arg to start on an even arg-slot index,
which is an odd register (since ppc32 args start with an odd one, r3).
> [6]: https://gist.github.com/Skirmisher/02891c1a8cafa0ff18b2460933ef4f3c
I don't think this is correct, but I'm confused about where it's
getting messed up because it looks like it should already be right.
> This was enough to fix up the `file` bug. I'm no seasoned kernel hacker,
> though, and there is still concern over the right way to approach this,
> whether it should live in the kernel or libc, etc. Frankly, I don't know the
> ABI structure enough to understand why the register padding has to be
> different in this case, or what lower-level component is responsible for it..
> For comparison, I had a look at the mips tree, since it's bi-endian and has a
> similar 32/64 situation. There is a macro conditional upon endianness that is
> responsible for munging long longs; it uses __MIPSEB__ and __MIPSEL__ instead
> of an if/else on the generic __LITTLE_ENDIAN__. Not sure what to make of that.
> (It also simply swaps registers for LE, unlike what I did for ppc.)
Indeed the problem is probably that you need to swap registers for LE,
not remove the padding slot. Did you check what happens if you pass a
value larger than 32 bits?
If so, the right way to fix this on the kernel side would be to
construct the value as a union rather than by bitwise ops so it's
endian-agnostic:
(union { u32 parts[2]; u64 val; }){{ arg1, arg2 }}.val
But the kernel folks might prefer endian ifdefs for some odd reason...
> Also worth noting is the one other outstanding bug, where the time-related
> syscalls in the 32-bit vDSO seem to return garbage. It doesn't look like an
> endian bug to me, and it doesn't affect standard syscalls (which is why if you
> run `date` on musl it prints the correct time, unlike on glibc). The vDSO time
> functions are implemented in ppc asm (arch/powerpc/kernel/vdso32/
> gettimeofday.S), and I've never touched the stuff, so if anyone has a clue I'm
> all ears.
Not sure about this. Worst-case, just leave it disabled until someone
finds a fix.
Rich
^ permalink raw reply
* [PATCH v3 3/5] s390: Break cyclic percpu include
From: Peter Zijlstra @ 2020-05-29 21:35 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200529213550.683440625@infradead.org>
In order to use <asm/percpu.h> in irqflags.h, we need to make sure
asm/percpu.h does not itself depend on irqflags.h
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/s390/include/asm/smp.h | 1 +
arch/s390/include/asm/thread_info.h | 1 -
2 files changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -10,6 +10,7 @@
#include <asm/sigp.h>
#include <asm/lowcore.h>
+#include <asm/processor.h>
#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -24,7 +24,6 @@
#ifndef __ASSEMBLY__
#include <asm/lowcore.h>
#include <asm/page.h>
-#include <asm/processor.h>
#define STACK_INIT_OFFSET \
(THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs))
^ permalink raw reply
* [PATCH v3 4/5] lockdep: Change hardirq{s_enabled, _context} to per-cpu variables
From: Peter Zijlstra @ 2020-05-29 21:35 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200529213550.683440625@infradead.org>
Currently all IRQ-tracking state is in task_struct, this means that
task_struct needs to be defined before we use it.
Especially for lockdep_assert_irq*() this can lead to header-hell.
Move the hardirq state into per-cpu variables to avoid the task_struct
dependency.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
include/linux/irqflags.h | 19 ++++++++++++-------
include/linux/lockdep.h | 34 ++++++++++++++++++----------------
include/linux/sched.h | 2 --
kernel/fork.c | 4 +---
kernel/locking/lockdep.c | 30 +++++++++++++++---------------
kernel/softirq.c | 6 ++++++
6 files changed, 52 insertions(+), 43 deletions(-)
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -14,6 +14,7 @@
#include <linux/typecheck.h>
#include <asm/irqflags.h>
+#include <asm/percpu.h>
/* Currently lockdep_softirqs_on/off is used only by lockdep */
#ifdef CONFIG_PROVE_LOCKING
@@ -31,18 +32,22 @@
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
+
+DECLARE_PER_CPU(int, hardirqs_enabled);
+DECLARE_PER_CPU(int, hardirq_context);
+
extern void trace_hardirqs_on_prepare(void);
extern void trace_hardirqs_off_finish(void);
extern void trace_hardirqs_on(void);
extern void trace_hardirqs_off(void);
-# define lockdep_hardirq_context(p) ((p)->hardirq_context)
+# define lockdep_hardirq_context(p) (this_cpu_read(hardirq_context))
# define lockdep_softirq_context(p) ((p)->softirq_context)
-# define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
+# define lockdep_hardirqs_enabled(p) (this_cpu_read(hardirqs_enabled))
# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
-# define lockdep_hardirq_enter() \
-do { \
- if (!current->hardirq_context++) \
- current->hardirq_threaded = 0; \
+# define lockdep_hardirq_enter() \
+do { \
+ if (this_cpu_inc_return(hardirq_context) == 1) \
+ current->hardirq_threaded = 0; \
} while (0)
# define lockdep_hardirq_threaded() \
do { \
@@ -50,7 +55,7 @@ do { \
} while (0)
# define lockdep_hardirq_exit() \
do { \
- current->hardirq_context--; \
+ this_cpu_dec(hardirq_context); \
} while (0)
# define lockdep_softirq_enter() \
do { \
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -19,6 +19,7 @@ extern int lock_stat;
#define MAX_LOCKDEP_SUBCLASSES 8UL
+#include <asm/percpu.h>
#include <linux/types.h>
enum lockdep_wait_type {
@@ -703,28 +704,29 @@ do { \
lock_release(&(lock)->dep_map, _THIS_IP_); \
} while (0)
-#define lockdep_assert_irqs_enabled() do { \
- WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- !current->hardirqs_enabled, \
- "IRQs not enabled as expected\n"); \
- } while (0)
+DECLARE_PER_CPU(int, hardirqs_enabled);
+DECLARE_PER_CPU(int, hardirq_context);
-#define lockdep_assert_irqs_disabled() do { \
- WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- current->hardirqs_enabled, \
- "IRQs not disabled as expected\n"); \
- } while (0)
+#define lockdep_assert_irqs_enabled() \
+do { \
+ WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirqs_enabled)); \
+} while (0)
-#define lockdep_assert_in_irq() do { \
- WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- !current->hardirq_context, \
- "Not in hardirq as expected\n"); \
- } while (0)
+#define lockdep_assert_irqs_disabled() \
+do { \
+ WARN_ON_ONCE(debug_locks && this_cpu_read(hardirqs_enabled)); \
+} while (0)
+
+#define lockdep_assert_in_irq() \
+do { \
+ WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirq_context)); \
+} while (0)
#else
# define might_lock(lock) do { } while (0)
# define might_lock_read(lock) do { } while (0)
# define might_lock_nested(lock, subclass) do { } while (0)
+
# define lockdep_assert_irqs_enabled() do { } while (0)
# define lockdep_assert_irqs_disabled() do { } while (0)
# define lockdep_assert_in_irq() do { } while (0)
@@ -734,7 +736,7 @@ do { \
# define lockdep_assert_RT_in_threaded_ctx() do { \
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- current->hardirq_context && \
+ lockdep_hardirq_context(current) && \
!(current->hardirq_threaded || current->irq_config), \
"Not in threaded context on PREEMPT_RT as expected\n"); \
} while (0)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -991,8 +991,6 @@ struct task_struct {
unsigned long hardirq_disable_ip;
unsigned int hardirq_enable_event;
unsigned int hardirq_disable_event;
- int hardirqs_enabled;
- int hardirq_context;
u64 hardirq_chain_key;
unsigned long softirq_disable_ip;
unsigned long softirq_enable_ip;
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1946,8 +1946,8 @@ static __latent_entropy struct task_stru
rt_mutex_init_task(p);
+ lockdep_assert_irqs_enabled();
#ifdef CONFIG_PROVE_LOCKING
- DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
#endif
retval = -EAGAIN;
@@ -2028,7 +2028,6 @@ static __latent_entropy struct task_stru
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
p->irq_events = 0;
- p->hardirqs_enabled = 0;
p->hardirq_enable_ip = 0;
p->hardirq_enable_event = 0;
p->hardirq_disable_ip = _THIS_IP_;
@@ -2038,7 +2037,6 @@ static __latent_entropy struct task_stru
p->softirq_enable_event = 0;
p->softirq_disable_ip = 0;
p->softirq_disable_event = 0;
- p->hardirq_context = 0;
p->softirq_context = 0;
#endif
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -2062,9 +2062,9 @@ print_bad_irq_dependency(struct task_str
pr_warn("-----------------------------------------------------\n");
pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n",
curr->comm, task_pid_nr(curr),
- curr->hardirq_context, hardirq_count() >> HARDIRQ_SHIFT,
+ lockdep_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT,
curr->softirq_context, softirq_count() >> SOFTIRQ_SHIFT,
- curr->hardirqs_enabled,
+ lockdep_hardirqs_enabled(curr),
curr->softirqs_enabled);
print_lock(next);
@@ -3655,7 +3655,7 @@ void lockdep_hardirqs_on_prepare(unsigne
if (DEBUG_LOCKS_WARN_ON(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (unlikely(current->hardirqs_enabled)) {
+ if (unlikely(lockdep_hardirqs_enabled(current))) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3683,7 +3683,7 @@ void lockdep_hardirqs_on_prepare(unsigne
* Can't allow enabling interrupts while in an interrupt handler,
* that's general bad form and such. Recursion, limited stack etc..
*/
- if (DEBUG_LOCKS_WARN_ON(current->hardirq_context))
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context(current)))
return;
current->hardirq_chain_key = current->curr_chain_key;
@@ -3718,7 +3718,7 @@ void noinstr lockdep_hardirqs_on(unsigne
if (DEBUG_LOCKS_WARN_ON(curr->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (curr->hardirqs_enabled) {
+ if (lockdep_hardirqs_enabled(curr)) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3745,7 +3745,7 @@ void noinstr lockdep_hardirqs_on(unsigne
skip_checks:
/* we'll do an OFF -> ON transition: */
- curr->hardirqs_enabled = 1;
+ this_cpu_write(hardirqs_enabled, 1);
curr->hardirq_enable_ip = ip;
curr->hardirq_enable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_on_events);
@@ -3772,11 +3772,11 @@ void noinstr lockdep_hardirqs_off(unsign
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
- if (curr->hardirqs_enabled) {
+ if (lockdep_hardirqs_enabled(curr)) {
/*
* We have done an ON -> OFF transition:
*/
- curr->hardirqs_enabled = 0;
+ this_cpu_write(hardirqs_enabled, 0);
curr->hardirq_disable_ip = ip;
curr->hardirq_disable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_off_events);
@@ -3821,7 +3821,7 @@ void lockdep_softirqs_on(unsigned long i
* usage bit for all held locks, if hardirqs are
* enabled too:
*/
- if (curr->hardirqs_enabled)
+ if (lockdep_hardirqs_enabled(curr))
mark_held_locks(curr, LOCK_ENABLED_SOFTIRQ);
lockdep_recursion_finish();
}
@@ -3870,7 +3870,7 @@ mark_usage(struct task_struct *curr, str
*/
if (!hlock->trylock) {
if (hlock->read) {
- if (curr->hardirq_context)
+ if (lockdep_hardirq_context(curr))
if (!mark_lock(curr, hlock,
LOCK_USED_IN_HARDIRQ_READ))
return 0;
@@ -3879,7 +3879,7 @@ mark_usage(struct task_struct *curr, str
LOCK_USED_IN_SOFTIRQ_READ))
return 0;
} else {
- if (curr->hardirq_context)
+ if (lockdep_hardirq_context(curr))
if (!mark_lock(curr, hlock, LOCK_USED_IN_HARDIRQ))
return 0;
if (curr->softirq_context)
@@ -3917,7 +3917,7 @@ mark_usage(struct task_struct *curr, str
static inline unsigned int task_irq_context(struct task_struct *task)
{
- return LOCK_CHAIN_HARDIRQ_CONTEXT * !!task->hardirq_context +
+ return LOCK_CHAIN_HARDIRQ_CONTEXT * !!lockdep_hardirq_context(task) +
LOCK_CHAIN_SOFTIRQ_CONTEXT * !!task->softirq_context;
}
@@ -4010,7 +4010,7 @@ static inline short task_wait_context(st
* Set appropriate wait type for the context; for IRQs we have to take
* into account force_irqthread as that is implied by PREEMPT_RT.
*/
- if (curr->hardirq_context) {
+ if (lockdep_hardirq_context(curr)) {
/*
* Check if force_irqthreads will run us threaded.
*/
@@ -4853,11 +4853,11 @@ static void check_flags(unsigned long fl
return;
if (irqs_disabled_flags(flags)) {
- if (DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)) {
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled(current))) {
printk("possible reason: unannotated irqs-off.\n");
}
} else {
- if (DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)) {
+ if (DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled(current))) {
printk("possible reason: unannotated irqs-on.\n");
}
}
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -107,6 +107,12 @@ static bool ksoftirqd_running(unsigned l
* where hardirqs are disabled legitimately:
*/
#ifdef CONFIG_TRACE_IRQFLAGS
+
+DEFINE_PER_CPU(int, hardirqs_enabled);
+DEFINE_PER_CPU(int, hardirq_context);
+EXPORT_PER_CPU_SYMBOL_GPL(hardirqs_enabled);
+EXPORT_PER_CPU_SYMBOL_GPL(hardirq_context);
+
void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
{
unsigned long flags;
^ permalink raw reply
* [PATCH v3 5/5] lockdep: Remove lockdep_hardirq{s_enabled, _context}() argument
From: Peter Zijlstra @ 2020-05-29 21:35 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200529213550.683440625@infradead.org>
Now that the macros use per-cpu data, we no longer need the argument.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/entry/common.c | 2 +-
include/linux/irqflags.h | 8 ++++----
include/linux/lockdep.h | 2 +-
kernel/locking/lockdep.c | 30 +++++++++++++++---------------
kernel/softirq.c | 2 +-
tools/include/linux/irqflags.h | 4 ++--
6 files changed, 24 insertions(+), 24 deletions(-)
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -689,7 +689,7 @@ noinstr void idtentry_exit_user(struct p
noinstr bool idtentry_enter_nmi(struct pt_regs *regs)
{
- bool irq_state = lockdep_hardirqs_enabled(current);
+ bool irq_state = lockdep_hardirqs_enabled();
__nmi_enter();
lockdep_hardirqs_off(CALLER_ADDR0);
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -40,9 +40,9 @@ DECLARE_PER_CPU(int, hardirq_context);
extern void trace_hardirqs_off_finish(void);
extern void trace_hardirqs_on(void);
extern void trace_hardirqs_off(void);
-# define lockdep_hardirq_context(p) (this_cpu_read(hardirq_context))
+# define lockdep_hardirq_context() (this_cpu_read(hardirq_context))
# define lockdep_softirq_context(p) ((p)->softirq_context)
-# define lockdep_hardirqs_enabled(p) (this_cpu_read(hardirqs_enabled))
+# define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
# define lockdep_hardirq_enter() \
do { \
@@ -109,9 +109,9 @@ do { \
# define trace_hardirqs_off_finish() do { } while (0)
# define trace_hardirqs_on() do { } while (0)
# define trace_hardirqs_off() do { } while (0)
-# define lockdep_hardirq_context(p) 0
+# define lockdep_hardirq_context() 0
# define lockdep_softirq_context(p) 0
-# define lockdep_hardirqs_enabled(p) 0
+# define lockdep_hardirqs_enabled() 0
# define lockdep_softirqs_enabled(p) 0
# define lockdep_hardirq_enter() do { } while (0)
# define lockdep_hardirq_threaded() do { } while (0)
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -736,7 +736,7 @@ do { \
# define lockdep_assert_RT_in_threaded_ctx() do { \
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- lockdep_hardirq_context(current) && \
+ lockdep_hardirq_context() && \
!(current->hardirq_threaded || current->irq_config), \
"Not in threaded context on PREEMPT_RT as expected\n"); \
} while (0)
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -2062,9 +2062,9 @@ print_bad_irq_dependency(struct task_str
pr_warn("-----------------------------------------------------\n");
pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n",
curr->comm, task_pid_nr(curr),
- lockdep_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT,
+ lockdep_hardirq_context(), hardirq_count() >> HARDIRQ_SHIFT,
curr->softirq_context, softirq_count() >> SOFTIRQ_SHIFT,
- lockdep_hardirqs_enabled(curr),
+ lockdep_hardirqs_enabled(),
curr->softirqs_enabled);
print_lock(next);
@@ -3331,9 +3331,9 @@ print_usage_bug(struct task_struct *curr
pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] takes:\n",
curr->comm, task_pid_nr(curr),
- lockdep_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT,
+ lockdep_hardirq_context(), hardirq_count() >> HARDIRQ_SHIFT,
lockdep_softirq_context(curr), softirq_count() >> SOFTIRQ_SHIFT,
- lockdep_hardirqs_enabled(curr),
+ lockdep_hardirqs_enabled(),
lockdep_softirqs_enabled(curr));
print_lock(this);
@@ -3655,7 +3655,7 @@ void lockdep_hardirqs_on_prepare(unsigne
if (DEBUG_LOCKS_WARN_ON(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (unlikely(lockdep_hardirqs_enabled(current))) {
+ if (unlikely(lockdep_hardirqs_enabled())) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3683,7 +3683,7 @@ void lockdep_hardirqs_on_prepare(unsigne
* Can't allow enabling interrupts while in an interrupt handler,
* that's general bad form and such. Recursion, limited stack etc..
*/
- if (DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context(current)))
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context()))
return;
current->hardirq_chain_key = current->curr_chain_key;
@@ -3718,7 +3718,7 @@ void noinstr lockdep_hardirqs_on(unsigne
if (DEBUG_LOCKS_WARN_ON(curr->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (lockdep_hardirqs_enabled(curr)) {
+ if (lockdep_hardirqs_enabled()) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3772,7 +3772,7 @@ void noinstr lockdep_hardirqs_off(unsign
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
- if (lockdep_hardirqs_enabled(curr)) {
+ if (lockdep_hardirqs_enabled()) {
/*
* We have done an ON -> OFF transition:
*/
@@ -3821,7 +3821,7 @@ void lockdep_softirqs_on(unsigned long i
* usage bit for all held locks, if hardirqs are
* enabled too:
*/
- if (lockdep_hardirqs_enabled(curr))
+ if (lockdep_hardirqs_enabled())
mark_held_locks(curr, LOCK_ENABLED_SOFTIRQ);
lockdep_recursion_finish();
}
@@ -3870,7 +3870,7 @@ mark_usage(struct task_struct *curr, str
*/
if (!hlock->trylock) {
if (hlock->read) {
- if (lockdep_hardirq_context(curr))
+ if (lockdep_hardirq_context())
if (!mark_lock(curr, hlock,
LOCK_USED_IN_HARDIRQ_READ))
return 0;
@@ -3879,7 +3879,7 @@ mark_usage(struct task_struct *curr, str
LOCK_USED_IN_SOFTIRQ_READ))
return 0;
} else {
- if (lockdep_hardirq_context(curr))
+ if (lockdep_hardirq_context())
if (!mark_lock(curr, hlock, LOCK_USED_IN_HARDIRQ))
return 0;
if (curr->softirq_context)
@@ -3917,7 +3917,7 @@ mark_usage(struct task_struct *curr, str
static inline unsigned int task_irq_context(struct task_struct *task)
{
- return LOCK_CHAIN_HARDIRQ_CONTEXT * !!lockdep_hardirq_context(task) +
+ return LOCK_CHAIN_HARDIRQ_CONTEXT * !!lockdep_hardirq_context() +
LOCK_CHAIN_SOFTIRQ_CONTEXT * !!task->softirq_context;
}
@@ -4010,7 +4010,7 @@ static inline short task_wait_context(st
* Set appropriate wait type for the context; for IRQs we have to take
* into account force_irqthread as that is implied by PREEMPT_RT.
*/
- if (lockdep_hardirq_context(curr)) {
+ if (lockdep_hardirq_context()) {
/*
* Check if force_irqthreads will run us threaded.
*/
@@ -4853,11 +4853,11 @@ static void check_flags(unsigned long fl
return;
if (irqs_disabled_flags(flags)) {
- if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled(current))) {
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled())) {
printk("possible reason: unannotated irqs-off.\n");
}
} else {
- if (DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled(current))) {
+ if (DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled())) {
printk("possible reason: unannotated irqs-on.\n");
}
}
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -230,7 +230,7 @@ static inline bool lockdep_softirq_start
{
bool in_hardirq = false;
- if (lockdep_hardirq_context(current)) {
+ if (lockdep_hardirq_context()) {
in_hardirq = true;
lockdep_hardirq_exit();
}
--- a/tools/include/linux/irqflags.h
+++ b/tools/include/linux/irqflags.h
@@ -2,9 +2,9 @@
#ifndef _LIBLOCKDEP_LINUX_TRACE_IRQFLAGS_H_
#define _LIBLOCKDEP_LINUX_TRACE_IRQFLAGS_H_
-# define lockdep_hardirq_context(p) 0
+# define lockdep_hardirq_context() 0
# define lockdep_softirq_context(p) 0
-# define lockdep_hardirqs_enabled(p) 0
+# define lockdep_hardirqs_enabled() 0
# define lockdep_softirqs_enabled(p) 0
# define lockdep_hardirq_enter() do { } while (0)
# define lockdep_hardirq_exit() do { } while (0)
^ permalink raw reply
* [RFC][PATCH v3 1/5] sparc64: Fix asm/percpu.h build error
From: Peter Zijlstra @ 2020-05-29 21:35 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200529213550.683440625@infradead.org>
In order to break a header dependency between lockdep and task_struct,
I need per-cpu stuff from lockdep.
Including <asm/percpu.h> from lockdep.h gives a build error, this
patch cures that, but results in the following warning:
../arch/sparc/include/asm/percpu_64.h:7:24: warning: call-clobbered register used for global register variable
register unsigned long __local_per_cpu_offset asm("g5");
But i've no idea how to fix that :/ but it does build.
Not-Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/sparc/include/asm/trap_block.h | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/sparc/include/asm/trap_block.h
+++ b/arch/sparc/include/asm/trap_block.h
@@ -2,6 +2,8 @@
#ifndef _SPARC_TRAP_BLOCK_H
#define _SPARC_TRAP_BLOCK_H
+#include <linux/threads.h>
+
#include <asm/hypervisor.h>
#include <asm/asi.h>
^ permalink raw reply
* [PATCH v3 2/5] powerpc64: Break asm/percpu.h vs spinlock_types.h dependency
From: Peter Zijlstra @ 2020-05-29 21:35 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200529213550.683440625@infradead.org>
In order to use <asm/percpu.h> in lockdep.h, we need to make sure
asm/percpu.h does not itself depend on lockdep.
The below seems to make that so and builds powerpc64-defconfig +
PROVE_LOCKING.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/powerpc/include/asm/dtl.h | 52 +++++++++++++++++++++++++++++++++
arch/powerpc/include/asm/lppaca.h | 44 ---------------------------
arch/powerpc/kernel/time.c | 1
arch/powerpc/kvm/book3s_hv.c | 1
arch/powerpc/platforms/pseries/dtl.c | 1
arch/powerpc/platforms/pseries/lpar.c | 1
arch/powerpc/platforms/pseries/setup.c | 1
arch/powerpc/platforms/pseries/svm.c | 1
8 files changed, 58 insertions(+), 44 deletions(-)
--- /dev/null
+++ b/arch/powerpc/include/asm/dtl.h
@@ -0,0 +1,52 @@
+#ifndef _ASM_POWERPC_DTL_H
+#define _ASM_POWERPC_DTL_H
+
+#include <asm/lppaca.h>
+#include <linux/spinlock_types.h>
+
+/*
+ * Layout of entries in the hypervisor's dispatch trace log buffer.
+ */
+struct dtl_entry {
+ u8 dispatch_reason;
+ u8 preempt_reason;
+ __be16 processor_id;
+ __be32 enqueue_to_dispatch_time;
+ __be32 ready_to_enqueue_time;
+ __be32 waiting_to_ready_time;
+ __be64 timebase;
+ __be64 fault_addr;
+ __be64 srr0;
+ __be64 srr1;
+};
+
+#define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
+#define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
+
+/*
+ * Dispatch trace log event enable mask:
+ * 0x1: voluntary virtual processor waits
+ * 0x2: time-slice preempts
+ * 0x4: virtual partition memory page faults
+ */
+#define DTL_LOG_CEDE 0x1
+#define DTL_LOG_PREEMPT 0x2
+#define DTL_LOG_FAULT 0x4
+#define DTL_LOG_ALL (DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
+
+extern struct kmem_cache *dtl_cache;
+extern rwlock_t dtl_access_lock;
+
+/*
+ * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
+ * reading from the dispatch trace log. If other code wants to consume
+ * DTL entries, it can set this pointer to a function that will get
+ * called once for each DTL entry that gets processed.
+ */
+extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
+
+extern void register_dtl_buffer(int cpu);
+extern void alloc_dtl_buffers(unsigned long *time_limit);
+extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
+
+#endif /* _ASM_POWERPC_DTL_H */
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -42,7 +42,6 @@
*/
#include <linux/cache.h>
#include <linux/threads.h>
-#include <linux/spinlock_types.h>
#include <asm/types.h>
#include <asm/mmu.h>
#include <asm/firmware.h>
@@ -146,49 +145,6 @@ struct slb_shadow {
} save_area[SLB_NUM_BOLTED];
} ____cacheline_aligned;
-/*
- * Layout of entries in the hypervisor's dispatch trace log buffer.
- */
-struct dtl_entry {
- u8 dispatch_reason;
- u8 preempt_reason;
- __be16 processor_id;
- __be32 enqueue_to_dispatch_time;
- __be32 ready_to_enqueue_time;
- __be32 waiting_to_ready_time;
- __be64 timebase;
- __be64 fault_addr;
- __be64 srr0;
- __be64 srr1;
-};
-
-#define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
-#define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
-
-/*
- * Dispatch trace log event enable mask:
- * 0x1: voluntary virtual processor waits
- * 0x2: time-slice preempts
- * 0x4: virtual partition memory page faults
- */
-#define DTL_LOG_CEDE 0x1
-#define DTL_LOG_PREEMPT 0x2
-#define DTL_LOG_FAULT 0x4
-#define DTL_LOG_ALL (DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
-
-extern struct kmem_cache *dtl_cache;
-extern rwlock_t dtl_access_lock;
-
-/*
- * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
- * reading from the dispatch trace log. If other code wants to consume
- * DTL entries, it can set this pointer to a function that will get
- * called once for each DTL entry that gets processed.
- */
-extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
-
-extern void register_dtl_buffer(int cpu);
-extern void alloc_dtl_buffers(unsigned long *time_limit);
extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
#endif /* CONFIG_PPC_BOOK3S */
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -69,6 +69,7 @@
#include <asm/vdso_datapage.h>
#include <asm/firmware.h>
#include <asm/asm-prototypes.h>
+#include <asm/dtl.h>
/* powerpc clocksource/clockevent code */
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -74,6 +74,7 @@
#include <asm/hw_breakpoint.h>
#include <asm/kvm_book3s_uvmem.h>
#include <asm/ultravisor.h>
+#include <asm/dtl.h>
#include "book3s.h"
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/arch/powerpc/platforms/pseries/dtl.c
@@ -12,6 +12,7 @@
#include <asm/smp.h>
#include <linux/uaccess.h>
#include <asm/firmware.h>
+#include <asm/dtl.h>
#include <asm/lppaca.h>
#include <asm/debugfs.h>
#include <asm/plpar_wrappers.h>
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -40,6 +40,7 @@
#include <asm/fadump.h>
#include <asm/asm-prototypes.h>
#include <asm/debugfs.h>
+#include <asm/dtl.h>
#include "pseries.h"
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -70,6 +70,7 @@
#include <asm/asm-const.h>
#include <asm/swiotlb.h>
#include <asm/svm.h>
+#include <asm/dtl.h>
#include "pseries.h"
#include "../../../../drivers/pci/pci.h"
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c
@@ -11,6 +11,7 @@
#include <asm/svm.h>
#include <asm/swiotlb.h>
#include <asm/ultravisor.h>
+#include <asm/dtl.h>
static int __init init_svm(void)
{
^ permalink raw reply
* [PATCH v3 0/5] lockdep: Change IRQ state tracking to use per-cpu variables
From: Peter Zijlstra @ 2020-05-29 21:35 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, a.darwish, sparclinux, linuxppc-dev, davem
Ahmed and Sebastian wanted additional lockdep_assert*() macros and ran
into header hell.
Move the IRQ state into per-cpu variables, which removes the dependency on
task_struct, which is what generated the header-hell.
These patches are intended to go on top of:
https://lkml.kernel.org/r/20200529212728.795169701@infradead.org
but should apply on current tip/master without much difficulty.
There are a few build fixes for Sparc64, PowerPC64 and s390. Especially the
Sparc one I'm not sure about.
^ permalink raw reply
* [PATCH v9 0/5] powerpc/papr_scm: Add support for reporting nvdimm health
From: Vaibhav Jain @ 2020-05-29 21:47 UTC (permalink / raw)
To: linuxppc-dev, linux-nvdimm, linux-kernel
Cc: Santosh Sivaraj, Steven Rostedt, Oliver O'Halloran,
Aneesh Kumar K . V, Vaibhav Jain, Dan Williams, Ira Weiny
Changes since v8 [1]:
* Updated proposed changes to remove usage of term 'SCM' due to
ambiguity with 'PMEM' and 'NVDIMM'. [ Dan Williams ]
* Replaced the usage of term 'SCM' with 'PMEM' in most contexts.
[ Aneesh ]
* Renamed NVDIMM health defines from PAPR_SCM_DIMM_* to PAPR_PMEM_* .
* Updates to various newly introduced identifiers in 'papr_scm.c'
removing the 'SCM' prefix from their names.
* Renamed NVDIMM_FAMILY_PAPR_SCM to NVDIMM_FAMILY_PAPR
* Renamed PAPR_SCM_PDSM_HEALTH PAPR_PDSM_HEALTH
* Renamed uapi header 'papr_scm_pdsm.h' to 'papr_pdsm.h'.
* Renamed sysfs ABI document from sysfs-bus-papr-scm to
sysfs-bus-papr-pmem.
* No behavioural changes from v8 [1].
[1] https://lore.kernel.org/linux-nvdimm/20200527041244.37821-1-vaibhav@linux.ibm.com/
---
The PAPR standard[2][4] provides mechanisms to query the health and
performance stats of an NVDIMM via various hcalls as described in
Ref[3]. Until now these stats were never available nor exposed to the
user-space tools like 'ndctl'. This is partly due to PAPR platform not
having support for ACPI and NFIT. Hence 'ndctl' is unable to query and
report the dimm health status and a user had no way to determine the
current health status of a NDVIMM.
To overcome this limitation, this patch-set updates papr_scm kernel
module to query and fetch NVDIMM health stats using hcalls described
in Ref[3]. This health and performance stats are then exposed to
userspace via sysfs and PAPR-NVDIMM-Specific-Methods(PDSM) issued by
libndctl.
These changes coupled with proposed ndtcl changes located at Ref[5]
should provide a way for the user to retrieve NVDIMM health status
using ndtcl.
Below is a sample output using proposed kernel + ndctl for PAPR NVDIMM
in a emulation environment:
# ndctl list -DH
[
{
"dev":"nmem0",
"health":{
"health_state":"fatal",
"shutdown_state":"dirty"
}
}
]
Dimm health report output on a pseries guest lpar with vPMEM or HMS
based NVDIMMs that are in perfectly healthy conditions:
# ndctl list -d nmem0 -H
[
{
"dev":"nmem0",
"health":{
"health_state":"ok",
"shutdown_state":"clean"
}
}
]
PAPR NVDIMM-Specific-Methods(PDSM)
==================================
PDSM requests are issued by vendor specific code in libndctl to
execute certain operations or fetch information from NVDIMMS. PDSMs
requests can be sent to papr_scm module via libndctl(userspace) and
libnvdimm (kernel) using the ND_CMD_CALL ioctl command which can be
handled in the dimm control function papr_scm_ndctl(). Current
patchset proposes a single PDSM to retrieve NVDIMM health, defined in
the newly introduced uapi header named 'papr_pdsm.h'. Support for
more PDSMs will be added in future.
Structure of the patch-set
==========================
The patch-set starts with a doc patch documenting details of hcall
H_SCM_HEALTH. Second patch exports kernel symbol seq_buf_printf()
thats used in subsequent patches to generate sysfs attribute content.
Third patch implements support for fetching NVDIMM health information
from PHYP and partially exposing it to user-space via a NVDIMM sysfs
flag.
Fourth patches deal with implementing support for servicing PDSM
commands in papr_scm module.
Finally the last patch implements support for servicing PDSM
'PAPR_PDSM_HEALTH' that returns the NVDIMM health information to
libndctl.
References:
[2] "Power Architecture Platform Reference"
https://en.wikipedia.org/wiki/Power_Architecture_Platform_Reference
[3] commit 58b278f568f0
("powerpc: Provide initial documentation for PAPR hcalls")
[4] "Linux on Power Architecture Platform Reference"
https://members.openpowerfoundation.org/document/dl/469
[5] https://github.com/vaibhav92/ndctl/tree/papr_scm_health_v9
---
Vaibhav Jain (5):
powerpc: Document details on H_SCM_HEALTH hcall
seq_buf: Export seq_buf_printf
powerpc/papr_scm: Fetch nvdimm health information from PHYP
ndctl/papr_scm,uapi: Add support for PAPR nvdimm specific methods
powerpc/papr_scm: Implement support for PAPR_PDSM_HEALTH
Documentation/ABI/testing/sysfs-bus-papr-pmem | 27 ++
Documentation/powerpc/papr_hcalls.rst | 46 ++-
arch/powerpc/include/uapi/asm/papr_pdsm.h | 175 +++++++++
arch/powerpc/platforms/pseries/papr_scm.c | 363 +++++++++++++++++-
include/uapi/linux/ndctl.h | 1 +
lib/seq_buf.c | 1 +
6 files changed, 600 insertions(+), 13 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-papr-pmem
create mode 100644 arch/powerpc/include/uapi/asm/papr_pdsm.h
--
2.26.2
^ permalink raw reply
* [PATCH v9 1/5] powerpc: Document details on H_SCM_HEALTH hcall
From: Vaibhav Jain @ 2020-05-29 21:47 UTC (permalink / raw)
To: linuxppc-dev, linux-nvdimm, linux-kernel
Cc: Santosh Sivaraj, Steven Rostedt, Oliver O'Halloran,
Aneesh Kumar K . V, Vaibhav Jain, Dan Williams, Ira Weiny
In-Reply-To: <20200529214719.223344-1-vaibhav@linux.ibm.com>
Add documentation to 'papr_hcalls.rst' describing the bitmap flags
that are returned from H_SCM_HEALTH hcall as per the PAPR-SCM
specification.
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
Changelog:
v8..v9:
* s/SCM/PMEM device. [ Dan Williams, Aneesh ]
v7..v8:
* Added a clarification on bit-ordering of Health Bitmap
Resend:
* None
v6..v7:
* None
v5..v6:
* New patch in the series
---
Documentation/powerpc/papr_hcalls.rst | 46 ++++++++++++++++++++++++---
1 file changed, 42 insertions(+), 4 deletions(-)
diff --git a/Documentation/powerpc/papr_hcalls.rst b/Documentation/powerpc/papr_hcalls.rst
index 3493631a60f8..48fcf1255a33 100644
--- a/Documentation/powerpc/papr_hcalls.rst
+++ b/Documentation/powerpc/papr_hcalls.rst
@@ -220,13 +220,51 @@ from the LPAR memory.
**H_SCM_HEALTH**
| Input: drcIndex
-| Out: *health-bitmap, health-bit-valid-bitmap*
+| Out: *health-bitmap (r4), health-bit-valid-bitmap (r5)*
| Return Value: *H_Success, H_Parameter, H_Hardware*
Given a DRC Index return the info on predictive failure and overall health of
-the NVDIMM. The asserted bits in the health-bitmap indicate a single predictive
-failure and health-bit-valid-bitmap indicate which bits in health-bitmap are
-valid.
+the PMEM device. The asserted bits in the health-bitmap indicate one or more states
+(described in table below) of the PMEM device and health-bit-valid-bitmap indicate
+which bits in health-bitmap are valid. The bits are reported in
+reverse bit ordering for example a value of 0xC400000000000000
+indicates bits 0, 1, and 5 are valid.
+
+Health Bitmap Flags:
+
++------+-----------------------------------------------------------------------+
+| Bit | Definition |
++======+=======================================================================+
+| 00 | PMEM device is unable to persist memory contents. |
+| | If the system is powered down, nothing will be saved. |
++------+-----------------------------------------------------------------------+
+| 01 | PMEM device failed to persist memory contents. Either contents were |
+| | not saved successfully on power down or were not restored properly on |
+| | power up. |
++------+-----------------------------------------------------------------------+
+| 02 | PMEM device contents are persisted from previous IPL. The data from |
+| | the last boot were successfully restored. |
++------+-----------------------------------------------------------------------+
+| 03 | PMEM device contents are not persisted from previous IPL. There was no|
+| | data to restore from the last boot. |
++------+-----------------------------------------------------------------------+
+| 04 | PMEM device memory life remaining is critically low |
++------+-----------------------------------------------------------------------+
+| 05 | PMEM device will be garded off next IPL due to failure |
++------+-----------------------------------------------------------------------+
+| 06 | PMEM device contents cannot persist due to current platform health |
+| | status. A hardware failure may prevent data from being saved or |
+| | restored. |
++------+-----------------------------------------------------------------------+
+| 07 | PMEM device is unable to persist memory contents in certain conditions|
++------+-----------------------------------------------------------------------+
+| 08 | PMEM device is encrypted |
++------+-----------------------------------------------------------------------+
+| 09 | PMEM device has successfully completed a requested erase or secure |
+| | erase procedure. |
++------+-----------------------------------------------------------------------+
+|10:63 | Reserved / Unused |
++------+-----------------------------------------------------------------------+
**H_SCM_PERFORMANCE_STATS**
--
2.26.2
^ permalink raw reply related
* [PATCH v9 3/5] powerpc/papr_scm: Fetch nvdimm health information from PHYP
From: Vaibhav Jain @ 2020-05-29 21:47 UTC (permalink / raw)
To: linuxppc-dev, linux-nvdimm, linux-kernel
Cc: Santosh Sivaraj, Steven Rostedt, Oliver O'Halloran,
Aneesh Kumar K . V, Vaibhav Jain, Dan Williams, Ira Weiny
In-Reply-To: <20200529214719.223344-1-vaibhav@linux.ibm.com>
Implement support for fetching nvdimm health information via
H_SCM_HEALTH hcall as documented in Ref[1]. The hcall returns a pair
of 64-bit bitmap, bitwise-and of which is then stored in
'struct papr_scm_priv' and subsequently partially exposed to
user-space via newly introduced dimm specific attribute
'papr/flags'. Since the hcall is costly, the health information is
cached and only re-queried, 60s after the previous successful hcall.
The patch also adds a documentation text describing flags reported by
the the new sysfs attribute 'papr/flags' is also introduced at
Documentation/ABI/testing/sysfs-bus-papr-pmem.
[1] commit 58b278f568f0 ("powerpc: Provide initial documentation for
PAPR hcalls")
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
Changelog:
v8..v9:
* Rename some variables and defines to reduce usage of term SCM
replacing it with PMEM [Dan Williams, Aneesh]
* s/PAPR_SCM_DIMM/PAPR_PMEM/g
* s/papr_scm_nd_attributes/papr_nd_attributes/g
* s/papr_scm_nd_attribute_group/papr_nd_attribute_group/g
* s/papr_scm_dimm_attr_groups/papr_nd_attribute_groups/g
* Renamed file sysfs-bus-papr-scm to sysfs-bus-papr-pmem
v7..v8:
* Update type of variable 'rc' in __drc_pmem_query_health() and
drc_pmem_query_health() to long and int respectively. [ Ira ]
* Updated the patch description to s/64 bit Big Endian Number/64-bit
bitmap/ [ Ira, Aneesh ].
Resend:
* None
v6..v7 :
* Used the exported buf_seq_printf() function to generate content for
'papr/flags'
* Moved the PAPR_SCM_DIMM_* bit-flags macro definitions to papr_scm.c
and removed the papr_scm.h file [Mpe]
* Some minor consistency issued in sysfs-bus-papr-scm
documentation. [Mpe]
* s/dimm_mutex/health_mutex/g [Mpe]
* Split drc_pmem_query_health() into two function one of which takes
care of caching and locking. [Mpe]
* Fixed a local copy creation of dimm health information using
READ_ONCE(). [Mpe]
v5..v6 :
* Change the flags sysfs attribute from 'papr_flags' to 'papr/flags'
[Dan Williams]
* Include documentation for 'papr/flags' attr [Dan Williams]
* Change flag 'save_fail' to 'flush_fail' [Dan Williams]
* Caching of health bitmap to reduce expensive hcalls [Dan Williams]
* Removed usage of PPC_BIT from 'papr-scm.h' header [Mpe]
* Replaced two __be64 integers from papr_scm_priv to a single u64
integer [Mpe]
* Updated patch description to reflect the changes made in this
version.
* Removed avoidable usage of 'papr_scm_priv.dimm_mutex' from
flags_show() [Dan Williams]
v4..v5 :
* None
v3..v4 :
* None
v2..v3 :
* Removed PAPR_SCM_DIMM_HEALTH_NON_CRITICAL as a condition for
NVDIMM unarmed [Aneesh]
v1..v2 :
* New patch in the series.
---
Documentation/ABI/testing/sysfs-bus-papr-pmem | 27 +++
arch/powerpc/platforms/pseries/papr_scm.c | 169 +++++++++++++++++-
2 files changed, 194 insertions(+), 2 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-papr-pmem
diff --git a/Documentation/ABI/testing/sysfs-bus-papr-pmem b/Documentation/ABI/testing/sysfs-bus-papr-pmem
new file mode 100644
index 000000000000..5b10d036a8d4
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-papr-pmem
@@ -0,0 +1,27 @@
+What: /sys/bus/nd/devices/nmemX/papr/flags
+Date: Apr, 2020
+KernelVersion: v5.8
+Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, linux-nvdimm@lists.01.org,
+Description:
+ (RO) Report flags indicating various states of a
+ papr-pmem NVDIMM device. Each flag maps to a one or
+ more bits set in the dimm-health-bitmap retrieved in
+ response to H_SCM_HEALTH hcall. The details of the bit
+ flags returned in response to this hcall is available
+ at 'Documentation/powerpc/papr_hcalls.rst' . Below are
+ the flags reported in this sysfs file:
+
+ * "not_armed" : Indicates that NVDIMM contents will not
+ survive a power cycle.
+ * "flush_fail" : Indicates that NVDIMM contents
+ couldn't be flushed during last
+ shut-down event.
+ * "restore_fail": Indicates that NVDIMM contents
+ couldn't be restored during NVDIMM
+ initialization.
+ * "encrypted" : NVDIMM contents are encrypted.
+ * "smart_notify": There is health event for the NVDIMM.
+ * "scrubbed" : Indicating that contents of the
+ NVDIMM have been scrubbed.
+ * "locked" : Indicating that NVDIMM contents cant
+ be modified until next power cycle.
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index f35592423380..149431594839 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -12,6 +12,7 @@
#include <linux/libnvdimm.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
+#include <linux/seq_buf.h>
#include <asm/plpar_wrappers.h>
@@ -22,6 +23,44 @@
(1ul << ND_CMD_GET_CONFIG_DATA) | \
(1ul << ND_CMD_SET_CONFIG_DATA))
+/* DIMM health bitmap bitmap indicators */
+/* SCM device is unable to persist memory contents */
+#define PAPR_PMEM_UNARMED (1ULL << (63 - 0))
+/* SCM device failed to persist memory contents */
+#define PAPR_PMEM_SHUTDOWN_DIRTY (1ULL << (63 - 1))
+/* SCM device contents are persisted from previous IPL */
+#define PAPR_PMEM_SHUTDOWN_CLEAN (1ULL << (63 - 2))
+/* SCM device contents are not persisted from previous IPL */
+#define PAPR_PMEM_EMPTY (1ULL << (63 - 3))
+/* SCM device memory life remaining is critically low */
+#define PAPR_PMEM_HEALTH_CRITICAL (1ULL << (63 - 4))
+/* SCM device will be garded off next IPL due to failure */
+#define PAPR_PMEM_HEALTH_FATAL (1ULL << (63 - 5))
+/* SCM contents cannot persist due to current platform health status */
+#define PAPR_PMEM_HEALTH_UNHEALTHY (1ULL << (63 - 6))
+/* SCM device is unable to persist memory contents in certain conditions */
+#define PAPR_PMEM_HEALTH_NON_CRITICAL (1ULL << (63 - 7))
+/* SCM device is encrypted */
+#define PAPR_PMEM_ENCRYPTED (1ULL << (63 - 8))
+/* SCM device has been scrubbed and locked */
+#define PAPR_PMEM_SCRUBBED_AND_LOCKED (1ULL << (63 - 9))
+
+/* Bits status indicators for health bitmap indicating unarmed dimm */
+#define PAPR_PMEM_UNARMED_MASK (PAPR_PMEM_UNARMED | \
+ PAPR_PMEM_HEALTH_UNHEALTHY)
+
+/* Bits status indicators for health bitmap indicating unflushed dimm */
+#define PAPR_PMEM_BAD_SHUTDOWN_MASK (PAPR_PMEM_SHUTDOWN_DIRTY)
+
+/* Bits status indicators for health bitmap indicating unrestored dimm */
+#define PAPR_PMEM_BAD_RESTORE_MASK (PAPR_PMEM_EMPTY)
+
+/* Bit status indicators for smart event notification */
+#define PAPR_PMEM_SMART_EVENT_MASK (PAPR_PMEM_HEALTH_CRITICAL | \
+ PAPR_PMEM_HEALTH_FATAL | \
+ PAPR_PMEM_HEALTH_UNHEALTHY)
+
+/* private struct associated with each region */
struct papr_scm_priv {
struct platform_device *pdev;
struct device_node *dn;
@@ -39,6 +78,15 @@ struct papr_scm_priv {
struct resource res;
struct nd_region *region;
struct nd_interleave_set nd_set;
+
+ /* Protect dimm health data from concurrent read/writes */
+ struct mutex health_mutex;
+
+ /* Last time the health information of the dimm was updated */
+ unsigned long lasthealth_jiffies;
+
+ /* Health information for the dimm */
+ u64 health_bitmap;
};
static int drc_pmem_bind(struct papr_scm_priv *p)
@@ -144,6 +192,62 @@ static int drc_pmem_query_n_bind(struct papr_scm_priv *p)
return drc_pmem_bind(p);
}
+/*
+ * Issue hcall to retrieve dimm health info and populate papr_scm_priv with the
+ * health information.
+ */
+static int __drc_pmem_query_health(struct papr_scm_priv *p)
+{
+ unsigned long ret[PLPAR_HCALL_BUFSIZE];
+ long rc;
+
+ /* issue the hcall */
+ rc = plpar_hcall(H_SCM_HEALTH, ret, p->drc_index);
+ if (rc != H_SUCCESS) {
+ dev_err(&p->pdev->dev,
+ "Failed to query health information, Err:%ld\n", rc);
+ rc = -ENXIO;
+ goto out;
+ }
+
+ p->lasthealth_jiffies = jiffies;
+ p->health_bitmap = ret[0] & ret[1];
+
+ dev_dbg(&p->pdev->dev,
+ "Queried dimm health info. Bitmap:0x%016lx Mask:0x%016lx\n",
+ ret[0], ret[1]);
+out:
+ return rc;
+}
+
+/* Min interval in seconds for assuming stable dimm health */
+#define MIN_HEALTH_QUERY_INTERVAL 60
+
+/* Query cached health info and if needed call drc_pmem_query_health */
+static int drc_pmem_query_health(struct papr_scm_priv *p)
+{
+ unsigned long cache_timeout;
+ int rc;
+
+ /* Protect concurrent modifications to papr_scm_priv */
+ rc = mutex_lock_interruptible(&p->health_mutex);
+ if (rc)
+ return rc;
+
+ /* Jiffies offset for which the health data is assumed to be same */
+ cache_timeout = p->lasthealth_jiffies +
+ msecs_to_jiffies(MIN_HEALTH_QUERY_INTERVAL * 1000);
+
+ /* Fetch new health info is its older than MIN_HEALTH_QUERY_INTERVAL */
+ if (time_after(jiffies, cache_timeout))
+ rc = __drc_pmem_query_health(p);
+ else
+ /* Assume cached health data is valid */
+ rc = 0;
+
+ mutex_unlock(&p->health_mutex);
+ return rc;
+}
static int papr_scm_meta_get(struct papr_scm_priv *p,
struct nd_cmd_get_config_data_hdr *hdr)
@@ -286,6 +390,64 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
return 0;
}
+static ssize_t flags_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nvdimm *dimm = to_nvdimm(dev);
+ struct papr_scm_priv *p = nvdimm_provider_data(dimm);
+ struct seq_buf s;
+ u64 health;
+ int rc;
+
+ rc = drc_pmem_query_health(p);
+ if (rc)
+ return rc;
+
+ /* Copy health_bitmap locally, check masks & update out buffer */
+ health = READ_ONCE(p->health_bitmap);
+
+ seq_buf_init(&s, buf, PAGE_SIZE);
+ if (health & PAPR_PMEM_UNARMED_MASK)
+ seq_buf_printf(&s, "not_armed ");
+
+ if (health & PAPR_PMEM_BAD_SHUTDOWN_MASK)
+ seq_buf_printf(&s, "flush_fail ");
+
+ if (health & PAPR_PMEM_BAD_RESTORE_MASK)
+ seq_buf_printf(&s, "restore_fail ");
+
+ if (health & PAPR_PMEM_ENCRYPTED)
+ seq_buf_printf(&s, "encrypted ");
+
+ if (health & PAPR_PMEM_SMART_EVENT_MASK)
+ seq_buf_printf(&s, "smart_notify ");
+
+ if (health & PAPR_PMEM_SCRUBBED_AND_LOCKED)
+ seq_buf_printf(&s, "scrubbed locked ");
+
+ if (seq_buf_used(&s))
+ seq_buf_printf(&s, "\n");
+
+ return seq_buf_used(&s);
+}
+DEVICE_ATTR_RO(flags);
+
+/* papr_scm specific dimm attributes */
+static struct attribute *papr_nd_attributes[] = {
+ &dev_attr_flags.attr,
+ NULL,
+};
+
+static struct attribute_group papr_nd_attribute_group = {
+ .name = "papr",
+ .attrs = papr_nd_attributes,
+};
+
+static const struct attribute_group *papr_nd_attr_groups[] = {
+ &papr_nd_attribute_group,
+ NULL,
+};
+
static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
{
struct device *dev = &p->pdev->dev;
@@ -312,8 +474,8 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
dimm_flags = 0;
set_bit(NDD_LABELING, &dimm_flags);
- p->nvdimm = nvdimm_create(p->bus, p, NULL, dimm_flags,
- PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
+ p->nvdimm = nvdimm_create(p->bus, p, papr_nd_attr_groups,
+ dimm_flags, PAPR_SCM_DIMM_CMD_MASK, 0, NULL);
if (!p->nvdimm) {
dev_err(dev, "Error creating DIMM object for %pOF\n", p->dn);
goto err;
@@ -399,6 +561,9 @@ static int papr_scm_probe(struct platform_device *pdev)
if (!p)
return -ENOMEM;
+ /* Initialize the dimm mutex */
+ mutex_init(&p->health_mutex);
+
/* optional DT properties */
of_property_read_u32(dn, "ibm,metadata-size", &metadata_size);
--
2.26.2
^ permalink raw reply related
* [PATCH v9 4/5] ndctl/papr_scm, uapi: Add support for PAPR nvdimm specific methods
From: Vaibhav Jain @ 2020-05-29 21:47 UTC (permalink / raw)
To: linuxppc-dev, linux-nvdimm, linux-kernel
Cc: Santosh Sivaraj, Steven Rostedt, Oliver O'Halloran,
Aneesh Kumar K . V, Vaibhav Jain, Dan Williams, Ira Weiny
In-Reply-To: <20200529214719.223344-1-vaibhav@linux.ibm.com>
Introduce support for PAPR NVDIMM Specific Methods (PDSM) in papr_scm
module and add the command family NVDIMM_FAMILY_PAPR to the white list
of NVDIMM command sets. Also advertise support for ND_CMD_CALL for the
nvdimm command mask and implement necessary scaffolding in the module
to handle ND_CMD_CALL ioctl and PDSM requests that we receive.
The layout of the PDSM request as we expect from libnvdimm/libndctl is
described in newly introduced uapi header 'papr_pdsm.h' which
defines a new 'struct nd_pdsm_cmd_pkg' header. This header is used
to communicate the PDSM request via member
'nd_cmd_pkg.nd_command' and size of payload that need to be
sent/received for servicing the PDSM.
A new function is_cmd_valid() is implemented that reads the args to
papr_scm_ndctl() and performs sanity tests on them. A new function
papr_scm_service_pdsm() is introduced and is called from
papr_scm_ndctl() in case of a PDSM request is received via ND_CMD_CALL
command from libnvdimm.
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
Changelog:
v8..v9:
* Reduced the usage of term SCM replacing it with appropriate
replacement [ Dan Williams, Aneesh ]
* Renamed 'papr_scm_pdsm.h' to 'papr_pdsm.h'
* s/PAPR_SCM_PDSM_*/PAPR_PDSM_*/g
* s/NVDIMM_FAMILY_PAPR_SCM/NVDIMM_FAMILY_PAPR/g
* Minor updates to 'papr_psdm.h' to replace usage of term 'SCM'.
* Minor update to patch description.
v7..v8:
* Removed the 'payload_offset' field from 'struct
nd_pdsm_cmd_pkg'. Instead command payload is always assumed to start
at 'nd_pdsm_cmd_pkg.payload'. [ Aneesh ]
* To enable introducing new fields to 'struct nd_pdsm_cmd_pkg',
'reserved' field of 10-bytes is introduced. [ Aneesh ]
* Fixed a typo in "Backward Compatibility" section of papr_scm_pdsm.h
[ Ira ]
Resend:
* None
v6..v7 :
* Removed the re-definitions of __packed macro from papr_scm_pdsm.h
[Mpe].
* Removed the usage of __KERNEL__ macros in papr_scm_pdsm.h [Mpe].
* Removed macros that were unused in papr_scm.c from papr_scm_pdsm.h
[Mpe].
* Made functions defined in papr_scm_pdsm.h as static inline. [Mpe]
v5..v6 :
* Changed the usage of the term DSM to PDSM to distinguish it from the
ACPI term [ Dan Williams ]
* Renamed papr_scm_dsm.h to papr_scm_pdsm.h and updated various struct
to reflect the new terminology.
* Updated the patch description and title to reflect the new terminology.
* Squashed patch to introduce new command family in 'ndctl.h' with
this patch [ Dan Williams ]
* Updated the papr_scm_pdsm method starting index from 0x10000 to 0x0
[ Dan Williams ]
* Removed redundant license text from the papr_scm_psdm.h file.
[ Dan Williams ]
* s/envelop/envelope/ at various places [ Dan Williams ]
* Added '__packed' attribute to command package header to gaurd
against different compiler adding paddings between the fields.
[ Dan Williams]
* Converted various pr_debug to dev_debug [ Dan Williams ]
v4..v5 :
* None
v3..v4 :
* None
v2..v3 :
* Updated the patch prefix to 'ndctl/uapi' [Aneesh]
v1..v2 :
* None
---
arch/powerpc/include/uapi/asm/papr_pdsm.h | 136 ++++++++++++++++++++++
arch/powerpc/platforms/pseries/papr_scm.c | 101 +++++++++++++++-
include/uapi/linux/ndctl.h | 1 +
3 files changed, 232 insertions(+), 6 deletions(-)
create mode 100644 arch/powerpc/include/uapi/asm/papr_pdsm.h
diff --git a/arch/powerpc/include/uapi/asm/papr_pdsm.h b/arch/powerpc/include/uapi/asm/papr_pdsm.h
new file mode 100644
index 000000000000..6407fefcc007
--- /dev/null
+++ b/arch/powerpc/include/uapi/asm/papr_pdsm.h
@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * PAPR nvDimm Specific Methods (PDSM) and structs for libndctl
+ *
+ * (C) Copyright IBM 2020
+ *
+ * Author: Vaibhav Jain <vaibhav at linux.ibm.com>
+ */
+
+#ifndef _UAPI_ASM_POWERPC_PAPR_PDSM_H_
+#define _UAPI_ASM_POWERPC_PAPR_PDSM_H_
+
+#include <linux/types.h>
+
+/*
+ * PDSM Envelope:
+ *
+ * The ioctl ND_CMD_CALL transfers data between user-space and kernel via
+ * envelope which consists of a header and user-defined payload sections.
+ * The header is described by 'struct nd_pdsm_cmd_pkg' which expects a
+ * payload following it and accessible via 'nd_pdsm_cmd_pkg.payload' field.
+ * There is reserved field that can used to introduce new fields to the
+ * structure in future. It also tries to ensure that 'nd_pdsm_cmd_pkg.payload'
+ * lies at a 8-byte boundary.
+ *
+ * +-------------+---------------------+---------------------------+
+ * | 64-Bytes | 16-Bytes | Max 176-Bytes |
+ * +-------------+---------------------+---------------------------+
+ * | nd_pdsm_cmd_pkg | |
+ * |-------------+ | |
+ * | nd_cmd_pkg | | |
+ * +-------------+---------------------+---------------------------+
+ * | nd_family | | |
+ * | nd_size_out | cmd_status | |
+ * | nd_size_in | payload_version | payload |
+ * | nd_command | reserved | |
+ * | nd_fw_size | | |
+ * +-------------+---------------------+---------------------------+
+ *
+ * PDSM Header:
+ *
+ * The header is defined as 'struct nd_pdsm_cmd_pkg' which embeds a
+ * 'struct nd_cmd_pkg' instance. The PDSM command is assigned to member
+ * 'nd_cmd_pkg.nd_command'. Apart from size information of the envelope which is
+ * contained in 'struct nd_cmd_pkg', the header also has members following
+ * members:
+ *
+ * 'cmd_status' : (Out) Errors if any encountered while servicing PDSM.
+ * 'payload_version' : (In/Out) Version number associated with the payload.
+ * 'reserved' : Not used and reserved for future.
+ *
+ * PDSM Payload:
+ *
+ * The layout of the PDSM Payload is defined by various structs shared between
+ * papr_scm and libndctl so that contents of payload can be interpreted. During
+ * servicing of a PDSM the papr_scm module will read input args from the payload
+ * field by casting its contents to an appropriate struct pointer based on the
+ * PDSM command. Similarly the output of servicing the PDSM command will be
+ * copied to the payload field using the same struct.
+ *
+ * 'libnvdimm' enforces a hard limit of 256 bytes on the envelope size, which
+ * leaves around 176 bytes for the envelope payload (ignoring any padding that
+ * the compiler may silently introduce).
+ *
+ * Payload Version:
+ *
+ * A 'payload_version' field is present in PDSM header that indicates a specific
+ * version of the structure present in PDSM Payload for a given PDSM command.
+ * This provides backward compatibility in case the PDSM Payload structure
+ * evolves and different structures are supported by 'papr_scm' and 'libndctl'.
+ *
+ * When sending a PDSM Payload to 'papr_scm', 'libndctl' should send the version
+ * of the payload struct it supports via 'payload_version' field. The 'papr_scm'
+ * module when servicing the PDSM envelope checks the 'payload_version' and then
+ * uses 'payload struct version' == MIN('payload_version field',
+ * 'max payload-struct-version supported by papr_scm') to service the PDSM.
+ * After servicing the PDSM, 'papr_scm' put the negotiated version of payload
+ * struct in returned 'payload_version' field.
+ *
+ * Libndctl on receiving the envelope back from papr_scm again checks the
+ * 'payload_version' field and based on it use the appropriate version dsm
+ * struct to parse the results.
+ *
+ * Backward Compatibility:
+ *
+ * Above scheme of exchanging different versioned PDSM struct between libndctl
+ * and papr_scm should provide backward compatibility until following two
+ * assumptions/conditions when defining new PDSM structs hold:
+ *
+ * Let T(X) = { set of attributes in PDSM struct 'T' versioned X }
+ *
+ * 1. T(X) is a proper subset of T(Y) if Y > X.
+ * i.e Each new version of PDSM struct should retain existing struct
+ * attributes from previous version
+ *
+ * 2. If an entity (libndctl or papr_scm) supports a PDSM struct T(X) then
+ * it should also support T(1), T(2)...T(X - 1).
+ * i.e When adding support for new version of a PDSM struct, libndctl
+ * and papr_scm should retain support of the existing PDSM struct
+ * version they support.
+ */
+
+/* PDSM-header + payload expected with ND_CMD_CALL ioctl from libnvdimm */
+struct nd_pdsm_cmd_pkg {
+ struct nd_cmd_pkg hdr; /* Package header containing sub-cmd */
+ __s32 cmd_status; /* Out: Sub-cmd status returned back */
+ __u16 reserved[5]; /* Ignored and to be used in future */
+ __u16 payload_version; /* In/Out: version of the payload */
+ __u8 payload[]; /* In/Out: Sub-cmd data buffer */
+} __packed;
+
+/*
+ * Methods to be embedded in ND_CMD_CALL request. These are sent to the kernel
+ * via 'nd_pdsm_cmd_pkg.hdr.nd_command' member of the ioctl struct
+ */
+enum papr_pdsm {
+ PAPR_PDSM_MIN = 0x0,
+ PAPR_PDSM_MAX,
+};
+
+/* Convert a libnvdimm nd_cmd_pkg to pdsm specific pkg */
+static inline struct nd_pdsm_cmd_pkg *nd_to_pdsm_cmd_pkg(struct nd_cmd_pkg *cmd)
+{
+ return (struct nd_pdsm_cmd_pkg *) cmd;
+}
+
+/* Return the payload pointer for a given pcmd */
+static inline void *pdsm_cmd_to_payload(struct nd_pdsm_cmd_pkg *pcmd)
+{
+ if (pcmd->hdr.nd_size_in == 0 && pcmd->hdr.nd_size_out == 0)
+ return NULL;
+ else
+ return (void *)(pcmd->payload);
+}
+
+#endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 149431594839..5e2237e7ec08 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -15,13 +15,15 @@
#include <linux/seq_buf.h>
#include <asm/plpar_wrappers.h>
+#include <asm/papr_pdsm.h>
#define BIND_ANY_ADDR (~0ul)
#define PAPR_SCM_DIMM_CMD_MASK \
((1ul << ND_CMD_GET_CONFIG_SIZE) | \
(1ul << ND_CMD_GET_CONFIG_DATA) | \
- (1ul << ND_CMD_SET_CONFIG_DATA))
+ (1ul << ND_CMD_SET_CONFIG_DATA) | \
+ (1ul << ND_CMD_CALL))
/* DIMM health bitmap bitmap indicators */
/* SCM device is unable to persist memory contents */
@@ -350,16 +352,97 @@ static int papr_scm_meta_set(struct papr_scm_priv *p,
return 0;
}
+/*
+ * Validate the inputs args to dimm-control function and return '0' if valid.
+ * This also does initial sanity validation to ND_CMD_CALL sub-command packages.
+ */
+static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
+ unsigned int buf_len)
+{
+ unsigned long cmd_mask = PAPR_SCM_DIMM_CMD_MASK;
+ struct nd_pdsm_cmd_pkg *pkg = nd_to_pdsm_cmd_pkg(buf);
+ struct papr_scm_priv *p;
+
+ /* Only dimm-specific calls are supported atm */
+ if (!nvdimm)
+ return -EINVAL;
+
+ /* get the provider date from struct nvdimm */
+ p = nvdimm_provider_data(nvdimm);
+
+ if (!test_bit(cmd, &cmd_mask)) {
+ dev_dbg(&p->pdev->dev, "Unsupported cmd=%u\n", cmd);
+ return -EINVAL;
+ } else if (cmd == ND_CMD_CALL) {
+
+ /* Verify the envelope package */
+ if (!buf || buf_len < sizeof(struct nd_pdsm_cmd_pkg)) {
+ dev_dbg(&p->pdev->dev, "Invalid pkg size=%u\n",
+ buf_len);
+ return -EINVAL;
+ }
+
+ /* Verify that the PDSM family is valid */
+ if (pkg->hdr.nd_family != NVDIMM_FAMILY_PAPR) {
+ dev_dbg(&p->pdev->dev, "Invalid pkg family=0x%llx\n",
+ pkg->hdr.nd_family);
+ return -EINVAL;
+
+ }
+
+ /* We except a payload with all PDSM commands */
+ if (pdsm_cmd_to_payload(pkg) == NULL) {
+ dev_dbg(&p->pdev->dev,
+ "Empty payload for sub-command=0x%llx\n",
+ pkg->hdr.nd_command);
+ return -EINVAL;
+ }
+ }
+
+ /* Command looks valid */
+ return 0;
+}
+
+static int papr_scm_service_pdsm(struct papr_scm_priv *p,
+ struct nd_pdsm_cmd_pkg *call_pkg)
+{
+ /* unknown subcommands return error in packages */
+ if (call_pkg->hdr.nd_command <= PAPR_PDSM_MIN ||
+ call_pkg->hdr.nd_command >= PAPR_PDSM_MAX) {
+ dev_dbg(&p->pdev->dev, "Invalid PDSM request 0x%llx\n",
+ call_pkg->hdr.nd_command);
+ call_pkg->cmd_status = -EINVAL;
+ return 0;
+ }
+
+ /* Depending on the DSM command call appropriate service routine */
+ switch (call_pkg->hdr.nd_command) {
+ default:
+ dev_dbg(&p->pdev->dev, "Unsupported PDSM request 0x%llx\n",
+ call_pkg->hdr.nd_command);
+ call_pkg->cmd_status = -ENOENT;
+ return 0;
+ }
+}
+
static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len, int *cmd_rc)
{
struct nd_cmd_get_config_size *get_size_hdr;
struct papr_scm_priv *p;
+ struct nd_pdsm_cmd_pkg *call_pkg = NULL;
+ int rc;
- /* Only dimm-specific calls are supported atm */
- if (!nvdimm)
- return -EINVAL;
+ /* Use a local variable in case cmd_rc pointer is NULL */
+ if (cmd_rc == NULL)
+ cmd_rc = &rc;
+
+ *cmd_rc = is_cmd_valid(nvdimm, cmd, buf, buf_len);
+ if (*cmd_rc) {
+ pr_debug("Invalid cmd=0x%x. Err=%d\n", cmd, *cmd_rc);
+ return *cmd_rc;
+ }
p = nvdimm_provider_data(nvdimm);
@@ -381,13 +464,19 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
*cmd_rc = papr_scm_meta_set(p, buf);
break;
+ case ND_CMD_CALL:
+ call_pkg = nd_to_pdsm_cmd_pkg(buf);
+ *cmd_rc = papr_scm_service_pdsm(p, call_pkg);
+ break;
+
default:
- return -EINVAL;
+ dev_dbg(&p->pdev->dev, "Unknown command = %d\n", cmd);
+ *cmd_rc = -EINVAL;
}
dev_dbg(&p->pdev->dev, "returned with cmd_rc = %d\n", *cmd_rc);
- return 0;
+ return *cmd_rc;
}
static ssize_t flags_show(struct device *dev,
diff --git a/include/uapi/linux/ndctl.h b/include/uapi/linux/ndctl.h
index de5d90212409..0e09dc5cec19 100644
--- a/include/uapi/linux/ndctl.h
+++ b/include/uapi/linux/ndctl.h
@@ -244,6 +244,7 @@ struct nd_cmd_pkg {
#define NVDIMM_FAMILY_HPE2 2
#define NVDIMM_FAMILY_MSFT 3
#define NVDIMM_FAMILY_HYPERV 4
+#define NVDIMM_FAMILY_PAPR 5
#define ND_IOCTL_CALL _IOWR(ND_IOCTL, ND_CMD_CALL,\
struct nd_cmd_pkg)
--
2.26.2
^ permalink raw reply related
* [PATCH v9 5/5] powerpc/papr_scm: Implement support for PAPR_PDSM_HEALTH
From: Vaibhav Jain @ 2020-05-29 21:47 UTC (permalink / raw)
To: linuxppc-dev, linux-nvdimm, linux-kernel
Cc: Santosh Sivaraj, Steven Rostedt, Oliver O'Halloran,
Aneesh Kumar K . V, Vaibhav Jain, Dan Williams, Ira Weiny
In-Reply-To: <20200529214719.223344-1-vaibhav@linux.ibm.com>
This patch implements support for PDSM request 'PAPR_PDSM_HEALTH'
that returns a newly introduced 'struct nd_papr_pdsm_health' instance
containing dimm health information back to user space in response to
ND_CMD_CALL. This functionality is implemented in newly introduced
papr_pdsm_health() that queries the nvdimm health information and
then copies this information to the package payload whose layout is
defined by 'struct nd_papr_pdsm_health'.
The patch also introduces a new member 'struct papr_scm_priv.health'
thats an instance of 'struct nd_papr_pdsm_health' to cache the health
information of a nvdimm. As a result functions drc_pmem_query_health()
and flags_show() are updated to populate and use this new struct
instead of a u64 integer that was earlier used.
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
Changelog:
v8..v9:
* s/PAPR_SCM_PDSM_HEALTH/PAPR_PDSM_HEALTH/g [ Dan , Aneesh ]
* s/PAPR_SCM_PSDM_DIMM_*/PAPR_PDSM_DIMM_*/g
* Renamed papr_scm_get_health() to papr_psdm_health()
* Updated patch description to replace papr-scm dimm with nvdimm.
v7..v8:
* None
Resend:
* None
v6..v7:
* Updated flags_show() to use seq_buf_printf(). [Mpe]
* Updated papr_scm_get_health() to use newly introduced
__drc_pmem_query_health() bypassing the cache [Mpe].
v5..v6:
* Added attribute '__packed' to 'struct nd_papr_pdsm_health_v1' to
gaurd against possibility of different compilers adding different
paddings to the struct [ Dan Williams ]
* Updated 'struct nd_papr_pdsm_health_v1' to use __u8 instead of
'bool' and also updated drc_pmem_query_health() to take this into
account. [ Dan Williams ]
v4..v5:
* None
v3..v4:
* Call the DSM_PAPR_SCM_HEALTH service function from
papr_scm_service_dsm() instead of papr_scm_ndctl(). [Aneesh]
v2..v3:
* Updated struct nd_papr_scm_dimm_health_stat_v1 to use '__xx' types
as its exported to the userspace [Aneesh]
* Changed the constants DSM_PAPR_SCM_DIMM_XX indicating dimm health
from enum to #defines [Aneesh]
v1..v2:
* New patch in the series
---
arch/powerpc/include/uapi/asm/papr_pdsm.h | 39 +++++++
arch/powerpc/platforms/pseries/papr_scm.c | 125 +++++++++++++++++++---
2 files changed, 147 insertions(+), 17 deletions(-)
diff --git a/arch/powerpc/include/uapi/asm/papr_pdsm.h b/arch/powerpc/include/uapi/asm/papr_pdsm.h
index 6407fefcc007..411725a91591 100644
--- a/arch/powerpc/include/uapi/asm/papr_pdsm.h
+++ b/arch/powerpc/include/uapi/asm/papr_pdsm.h
@@ -115,6 +115,7 @@ struct nd_pdsm_cmd_pkg {
*/
enum papr_pdsm {
PAPR_PDSM_MIN = 0x0,
+ PAPR_PDSM_HEALTH,
PAPR_PDSM_MAX,
};
@@ -133,4 +134,42 @@ static inline void *pdsm_cmd_to_payload(struct nd_pdsm_cmd_pkg *pcmd)
return (void *)(pcmd->payload);
}
+/* Various nvdimm health indicators */
+#define PAPR_PDSM_DIMM_HEALTHY 0
+#define PAPR_PDSM_DIMM_UNHEALTHY 1
+#define PAPR_PDSM_DIMM_CRITICAL 2
+#define PAPR_PDSM_DIMM_FATAL 3
+
+/*
+ * Struct exchanged between kernel & ndctl in for PAPR_PDSM_HEALTH
+ * Various flags indicate the health status of the dimm.
+ *
+ * dimm_unarmed : Dimm not armed. So contents wont persist.
+ * dimm_bad_shutdown : Previous shutdown did not persist contents.
+ * dimm_bad_restore : Contents from previous shutdown werent restored.
+ * dimm_scrubbed : Contents of the dimm have been scrubbed.
+ * dimm_locked : Contents of the dimm cant be modified until CEC reboot
+ * dimm_encrypted : Contents of dimm are encrypted.
+ * dimm_health : Dimm health indicator. One of PAPR_PDSM_DIMM_XXXX
+ */
+struct nd_papr_pdsm_health_v1 {
+ __u8 dimm_unarmed;
+ __u8 dimm_bad_shutdown;
+ __u8 dimm_bad_restore;
+ __u8 dimm_scrubbed;
+ __u8 dimm_locked;
+ __u8 dimm_encrypted;
+ __u16 dimm_health;
+} __packed;
+
+/*
+ * Typedef the current struct for dimm_health so that any application
+ * or kernel recompiled after introducing a new version automatically
+ * supports the new version.
+ */
+#define nd_papr_pdsm_health nd_papr_pdsm_health_v1
+
+/* Current version number for the dimm health struct */
+#define ND_PAPR_PDSM_HEALTH_VERSION 1
+
#endif /* _UAPI_ASM_POWERPC_PAPR_PDSM_H_ */
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 5e2237e7ec08..c0606c0c659c 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -88,7 +88,7 @@ struct papr_scm_priv {
unsigned long lasthealth_jiffies;
/* Health information for the dimm */
- u64 health_bitmap;
+ struct nd_papr_pdsm_health health;
};
static int drc_pmem_bind(struct papr_scm_priv *p)
@@ -201,6 +201,7 @@ static int drc_pmem_query_n_bind(struct papr_scm_priv *p)
static int __drc_pmem_query_health(struct papr_scm_priv *p)
{
unsigned long ret[PLPAR_HCALL_BUFSIZE];
+ u64 health;
long rc;
/* issue the hcall */
@@ -208,18 +209,46 @@ static int __drc_pmem_query_health(struct papr_scm_priv *p)
if (rc != H_SUCCESS) {
dev_err(&p->pdev->dev,
"Failed to query health information, Err:%ld\n", rc);
- rc = -ENXIO;
- goto out;
+ return -ENXIO;
}
p->lasthealth_jiffies = jiffies;
- p->health_bitmap = ret[0] & ret[1];
+ health = ret[0] & ret[1];
dev_dbg(&p->pdev->dev,
"Queried dimm health info. Bitmap:0x%016lx Mask:0x%016lx\n",
ret[0], ret[1]);
-out:
- return rc;
+
+ memset(&p->health, 0, sizeof(p->health));
+
+ /* Check for various masks in bitmap and set the buffer */
+ if (health & PAPR_PMEM_UNARMED_MASK)
+ p->health.dimm_unarmed = 1;
+
+ if (health & PAPR_PMEM_BAD_SHUTDOWN_MASK)
+ p->health.dimm_bad_shutdown = 1;
+
+ if (health & PAPR_PMEM_BAD_RESTORE_MASK)
+ p->health.dimm_bad_restore = 1;
+
+ if (health & PAPR_PMEM_ENCRYPTED)
+ p->health.dimm_encrypted = 1;
+
+ if (health & PAPR_PMEM_SCRUBBED_AND_LOCKED) {
+ p->health.dimm_locked = 1;
+ p->health.dimm_scrubbed = 1;
+ }
+
+ if (health & PAPR_PMEM_HEALTH_UNHEALTHY)
+ p->health.dimm_health = PAPR_PDSM_DIMM_UNHEALTHY;
+
+ if (health & PAPR_PMEM_HEALTH_CRITICAL)
+ p->health.dimm_health = PAPR_PDSM_DIMM_CRITICAL;
+
+ if (health & PAPR_PMEM_HEALTH_FATAL)
+ p->health.dimm_health = PAPR_PDSM_DIMM_FATAL;
+
+ return 0;
}
/* Min interval in seconds for assuming stable dimm health */
@@ -403,6 +432,58 @@ static int is_cmd_valid(struct nvdimm *nvdimm, unsigned int cmd, void *buf,
return 0;
}
+/* Fetch the DIMM health info and populate it in provided package. */
+static int papr_pdsm_health(struct papr_scm_priv *p,
+ struct nd_pdsm_cmd_pkg *pkg)
+{
+ int rc;
+ size_t copysize = sizeof(p->health);
+
+ /* Ensure dimm health mutex is taken preventing concurrent access */
+ rc = mutex_lock_interruptible(&p->health_mutex);
+ if (rc)
+ goto out;
+
+ /* Always fetch upto date dimm health data ignoring cached values */
+ rc = __drc_pmem_query_health(p);
+ if (rc)
+ goto out_unlock;
+ /*
+ * If the requested payload version is greater than one we know
+ * about, return the payload version we know about and let
+ * caller/userspace handle.
+ */
+ if (pkg->payload_version > ND_PAPR_PDSM_HEALTH_VERSION)
+ pkg->payload_version = ND_PAPR_PDSM_HEALTH_VERSION;
+
+ if (pkg->hdr.nd_size_out < copysize) {
+ dev_dbg(&p->pdev->dev, "Truncated payload (%u). Expected (%lu)",
+ pkg->hdr.nd_size_out, copysize);
+ rc = -ENOSPC;
+ goto out_unlock;
+ }
+
+ dev_dbg(&p->pdev->dev, "Copying payload size=%lu version=0x%x\n",
+ copysize, pkg->payload_version);
+
+ /* Copy the health struct to the payload */
+ memcpy(pdsm_cmd_to_payload(pkg), &p->health, copysize);
+ pkg->hdr.nd_fw_size = copysize;
+
+out_unlock:
+ mutex_unlock(&p->health_mutex);
+
+out:
+ /*
+ * Put the error in out package and return success from function
+ * so that errors if any are propogated back to userspace.
+ */
+ pkg->cmd_status = rc;
+ dev_dbg(&p->pdev->dev, "completion code = %d\n", rc);
+
+ return 0;
+}
+
static int papr_scm_service_pdsm(struct papr_scm_priv *p,
struct nd_pdsm_cmd_pkg *call_pkg)
{
@@ -417,6 +498,9 @@ static int papr_scm_service_pdsm(struct papr_scm_priv *p,
/* Depending on the DSM command call appropriate service routine */
switch (call_pkg->hdr.nd_command) {
+ case PAPR_PDSM_HEALTH:
+ return papr_pdsm_health(p, call_pkg);
+
default:
dev_dbg(&p->pdev->dev, "Unsupported PDSM request 0x%llx\n",
call_pkg->hdr.nd_command);
@@ -485,34 +569,41 @@ static ssize_t flags_show(struct device *dev,
struct nvdimm *dimm = to_nvdimm(dev);
struct papr_scm_priv *p = nvdimm_provider_data(dimm);
struct seq_buf s;
- u64 health;
int rc;
rc = drc_pmem_query_health(p);
if (rc)
return rc;
- /* Copy health_bitmap locally, check masks & update out buffer */
- health = READ_ONCE(p->health_bitmap);
-
seq_buf_init(&s, buf, PAGE_SIZE);
- if (health & PAPR_PMEM_UNARMED_MASK)
+
+ /* Protect concurrent modifications to papr_scm_priv */
+ rc = mutex_lock_interruptible(&p->health_mutex);
+ if (rc)
+ return rc;
+
+ if (p->health.dimm_unarmed)
seq_buf_printf(&s, "not_armed ");
- if (health & PAPR_PMEM_BAD_SHUTDOWN_MASK)
+ if (p->health.dimm_bad_shutdown)
seq_buf_printf(&s, "flush_fail ");
- if (health & PAPR_PMEM_BAD_RESTORE_MASK)
+ if (p->health.dimm_bad_restore)
seq_buf_printf(&s, "restore_fail ");
- if (health & PAPR_PMEM_ENCRYPTED)
+ if (p->health.dimm_encrypted)
seq_buf_printf(&s, "encrypted ");
- if (health & PAPR_PMEM_SMART_EVENT_MASK)
+ if (p->health.dimm_health)
seq_buf_printf(&s, "smart_notify ");
- if (health & PAPR_PMEM_SCRUBBED_AND_LOCKED)
- seq_buf_printf(&s, "scrubbed locked ");
+ if (p->health.dimm_scrubbed)
+ seq_buf_printf(&s, "scrubbed ");
+
+ if (p->health.dimm_locked)
+ seq_buf_printf(&s, "locked ");
+
+ mutex_unlock(&p->health_mutex);
if (seq_buf_used(&s))
seq_buf_printf(&s, "\n");
--
2.26.2
^ permalink raw reply related
* [PATCH v9 2/5] seq_buf: Export seq_buf_printf
From: Vaibhav Jain @ 2020-05-29 21:47 UTC (permalink / raw)
To: linuxppc-dev, linux-nvdimm, linux-kernel
Cc: Santosh Sivaraj, Cezary Rojewski, Piotr Maziarz, Steven Rostedt,
Christoph Hellwig, Oliver O'Halloran, Aneesh Kumar K . V,
Borislav Petkov, Vaibhav Jain, Dan Williams, Ira Weiny
In-Reply-To: <20200529214719.223344-1-vaibhav@linux.ibm.com>
'seq_buf' provides a very useful abstraction for writing to a string
buffer without needing to worry about it over-flowing. However even
though the API has been stable for couple of years now its still not
exported to kernel loadable modules limiting its usage.
Hence this patch proposes update to 'seq_buf.c' to mark
seq_buf_printf() which is part of the seq_buf API to be exported to
kernel loadable GPL modules. This symbol will be used in later parts
of this patch-set to simplify content creation for a sysfs attribute.
Cc: Piotr Maziarz <piotrx.maziarz@linux.intel.com>
Cc: Cezary Rojewski <cezary.rojewski@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Borislav Petkov <bp@alien8.de>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
---
Changelog:
v8..v9:
* None
v7..v8:
* Updated the patch title [ Christoph Hellwig ]
* Updated patch description to replace confusing term 'external kernel
modules' to 'kernel lodable modules'.
Resend:
* Added ack from Steven Rostedt
v6..v7:
* New patch in the series
---
lib/seq_buf.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/lib/seq_buf.c b/lib/seq_buf.c
index 4e865d42ab03..707453f5d58e 100644
--- a/lib/seq_buf.c
+++ b/lib/seq_buf.c
@@ -91,6 +91,7 @@ int seq_buf_printf(struct seq_buf *s, const char *fmt, ...)
return ret;
}
+EXPORT_SYMBOL_GPL(seq_buf_printf);
#ifdef CONFIG_BINARY_PRINTF
/**
--
2.26.2
^ permalink raw reply related
* [powerpc:next-test 160/198] arch/powerpc/platforms/powernv/pci-ioda.c:1889:13: warning: function 'pnv_ioda_setup_bus_dma' is not needed and will not be emitted
From: kbuild test robot @ 2020-05-29 22:22 UTC (permalink / raw)
To: Oliver, O'Halloran,; +Cc: clang-built-linux, kbuild-all, linuxppc-dev
[-- Attachment #1: Type: text/plain, Size: 2998 bytes --]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next-test
head: e376ca093587eafd840bb0f9df04090e2a54249c
commit: dc3d8f85bb571c3640ebba24b82a527cf2cb3f24 [160/198] powerpc/powernv/pci: Re-work bus PE configuration
config: powerpc64-randconfig-r024-20200529 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2d068e534f1671459e1b135852c1b3c10502e929)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc64 cross compiling tool for clang build
# apt-get install binutils-powerpc64-linux-gnu
git checkout dc3d8f85bb571c3640ebba24b82a527cf2cb3f24
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>
All warnings (new ones prefixed by >>, old ones prefixed by <<):
>> arch/powerpc/platforms/powernv/pci-ioda.c:1889:13: warning: function 'pnv_ioda_setup_bus_dma' is not needed and will not be emitted [-Wunneeded-internal-declaration]
static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
^
1 warning generated.
vim +/pnv_ioda_setup_bus_dma +1889 arch/powerpc/platforms/powernv/pci-ioda.c
fe7e85c6f5ff63 Gavin Shan 2014-09-30 1888
5eada8a3f087df Alexey Kardashevskiy 2018-12-19 @1889 static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
74251fe21bfa93 Benjamin Herrenschmidt 2013-07-01 1890 {
74251fe21bfa93 Benjamin Herrenschmidt 2013-07-01 1891 struct pci_dev *dev;
74251fe21bfa93 Benjamin Herrenschmidt 2013-07-01 1892
74251fe21bfa93 Benjamin Herrenschmidt 2013-07-01 1893 list_for_each_entry(dev, &bus->devices, bus_list) {
b348aa65297659 Alexey Kardashevskiy 2015-06-05 1894 set_iommu_table_base(&dev->dev, pe->table_group.tables[0]);
0617fc0ca412b5 Christoph Hellwig 2019-02-13 1895 dev->dev.archdata.dma_offset = pe->tce_bypass_base;
dff4a39e880062 Gavin Shan 2014-07-15 1896
5c89a87d13d168 Alexey Kardashevskiy 2015-06-18 1897 if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
5eada8a3f087df Alexey Kardashevskiy 2018-12-19 1898 pnv_ioda_setup_bus_dma(pe, dev->subordinate);
74251fe21bfa93 Benjamin Herrenschmidt 2013-07-01 1899 }
74251fe21bfa93 Benjamin Herrenschmidt 2013-07-01 1900 }
74251fe21bfa93 Benjamin Herrenschmidt 2013-07-01 1901
:::::: The code at line 1889 was first introduced by commit
:::::: 5eada8a3f087df74af1c2797770a3e2249374fe1 powerpc/iommu_api: Move IOMMU groups setup to a single place
:::::: TO: Alexey Kardashevskiy <aik@ozlabs.ru>
:::::: CC: Michael Ellerman <mpe@ellerman.id.au>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 33114 bytes --]
^ permalink raw reply
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