Le 04/05/2022 à 19:57, Pali Rohár a écrit :
> Since commit 63a72284b159 ("powerpc/pci: Assign fixed PHB number based on
> device-tree properties"), powerpc kernel always fallback to PCI domain
> assignment from OF / Device Tree 'reg' property of the PCI controller.
>
> PCI code for other Linux a
Currently, enum export is tristate, but export_unknown does not make
sense in any way.
If the symbol name starts with "__ksymtab_", but the section name
does not start with "___ksymtab+" or "___ksymtab_gpl+", it is not
an exported symbol. The variable name just happens to start with
"__ksymtab_".
add_intree_flag(), add_retpoline(), and add_staging_flag() are small
enough to be merged into add_header().
Signed-off-by: Masahiro Yamada
---
Changes in v3:
- New patch
scripts/mod/modpost.c | 25 +++--
1 file changed, 7 insertions(+), 18 deletions(-)
diff --git a/scrip
The 'static' specifier and EXPORT_SYMBOL() are an odd combination.
Since commit 15bfc2348d54 ("modpost: check for static EXPORT_SYMBOL*
functions"), modpost tries to detect it, but there are false negatives.
Here is the sample code.
[Sample 1]
Makefile:
obj-m += mymod1.o mymod2.o
mymo
This is the third batch of cleanups in this development cycle.
Major changes in v3:
- Generate symbol CRCs as C code, and remove CONFIG_MODULE_REL_CRCS.
Major changes in v2:
- V1 did not work with CONFIG_MODULE_REL_CRCS.
I fixed this for v2.
- Reflect some review comments in v1
- Ref
A *.mod file lists the member objects of a module, but vmlinux does
not have such a file to list out all the member objects.
Generate this list to allow modpost to know all the member objects.
Signed-off-by: Masahiro Yamada
Reviewed-by: Nicolas Schier
---
(no changes since v2)
Changes in v2:
A later commit will add more code to this list_for_each_entry loop.
Before that, move the loop body into a separate helper function.
Signed-off-by: Masahiro Yamada
---
Changes in v3:
- New patch
scripts/mod/modpost.c | 56 ---
1 file changed, 31 inser
Import hlist macros from include/linux/list.h to implement the hash
table in a more generic way.
While I was here, I increased the hash table size from 1024 to 8192
to decrease the hash collision.
I moved ARRAY_SIZE() from file2alias.c to modpost.h because it is needed
in modpost.c as well.
Sign
include/{linux,asm-generic}/export.h defines a weak symbol, __crc_*
as a placeholder.
Genksyms writes the version CRCs into the linker script, which will be
used for filling the __crc_* symbols. The linker script format depends
on CONFIG_MODULE_REL_CRCS. If it is enabled, __crc_* holds the offset
When CONFIG_LTO_CLANG=y, additional intermediate *.prelink.o is created
for each module. Also, objtool is postponed until LLVM bitcode is
converted to ELF.
CONFIG_X86_KERNEL_IBT works in a similar way to postpone objtool until
objects are merged together.
This commit stops generating *.prelink.o,
Like built-in.a, the command length of the *.mod rule scales with
the depth of the directory times the number of objects in the Makefile.
Add $(obj)/ by the shell command (awk) instead of by Make's builtin
function.
In-tree modules still have some room to the limit (ARG_MAX=2097152),
but this is
Now modpost reads symbol versions from .*.cmd files.
These merged *.symversions are not used any more.
Signed-off-by: Masahiro Yamada
---
(no changes since v1)
scripts/Makefile.build | 21 ++---
scripts/link-vmlinux.sh | 15 ---
2 files changed, 2 insertions(+), 3
->is_static is set to true at allocation, then to false if the symbol
comes from the dump file.
It is simpler to use !mod->from_dump as the init value.
Signed-off-by: Masahiro Yamada
---
(no changes since v2)
Changes in v2:
- New patch
scripts/mod/modpost.c | 4 ++--
1 file changed, 2 inse
Currently, CONFIG_MODVERSIONS needs extra link to embed the symbol
versions into ELF objects. Then, modpost extracts the version CRCs
from them.
The following figures show how it currently works, and how I am trying
to change it.
Current implementation
==
When CONFIG_MODVERSIONS=y, the output from genksyms is saved in
separate *.symversions files, and will be used much later when
CONFIG_LTO_CLANG=y because it is impossible to update LLVM bit code
here.
This approach is not robust because:
- *.symversions may or may not exist. If *.symversions doe
Make genksyms output symbol versions in the format modpost expects,
so the 'sed' is unneeded.
This commit makes *.symversions completely unneeded.
I will keep *.symversions in .gitignore and 'make clean' for a while.
Otherwise, some people might be upset with 'git status'.
Signed-off-by: Masahir
Kbuild runs at the top of objtree instead of changing the working
directory to subdirectories. I think this design is nice overall but
some commands have a scapability issue.
The build command of built-in.a is one of them whose length scales with:
O(D * N)
Here, D is the length of the direct
Le 04/05/2022 à 17:40, Clément Léger a écrit :
> Add function which allows to dynamically allocate and free properties.
> Use this function internally for all code that used the same logic
> (mainly __of_prop_dup()).
>
> Signed-off-by: Clément Léger
> ---
> drivers/of/dynamic.c | 101
Le 04/05/2022 à 17:40, Clément Léger a écrit :
> Add functions which allows to create and free nodes.
>
> Signed-off-by: Clément Léger
> ---
> drivers/of/dynamic.c | 59
> include/linux/of.h | 9 +++
> 2 files changed, 58 insertions(+), 10
On Thu, 5 May 2022, Joel Stanley wrote:
> On Sat, 30 Apr 2022 at 18:58, Julia Lawall wrote:
> >
> > Various spelling mistakes in comments.
> > Detected with the help of Coccinelle.
> >
> > Signed-off-by: Julia Lawall
>
> I read the patch and it appears that all of the corrections are good.
>
On Wed, 2022-05-04 at 23:31 +0200, Arnd Bergmann wrote:
> On Wed, May 4, 2022 at 11:08 PM Bjorn Helgaas wrote:
> > On Fri, Apr 29, 2022 at 03:49:59PM +0200, Niklas Schnelle wrote:
> > > We introduce a new HAS_IOPORT Kconfig option to indicate support for
> > > I/O Port access. In a future patch HA
On Wed, 4 May 2022, Arnd Bergmann wrote:
> On Wed, May 4, 2022 at 10:33 AM Ilpo Järvinen
> wrote:
> > On Wed, 4 May 2022, Arnd Bergmann wrote:
> > > On Wed, May 4, 2022 at 9:20 AM Ilpo Järvinen
> > > wrote:
> > > >
> > > After applying the patch locally, I still see a bunch of whitespace
> > >
Hello!
On Thursday 05 May 2022 07:16:40 Christophe Leroy wrote:
> Le 04/05/2022 à 19:57, Pali Rohár a écrit :
> > Since commit 63a72284b159 ("powerpc/pci: Assign fixed PHB number based on
> > device-tree properties"), powerpc kernel always fallback to PCI domain
> > assignment from OF / Device Tre
The session topology test fails in powerpc pSeries platform.
Test logs:
<<>>
Session topology : FAILED!
<<>>
This test uses cpu topology information and in powerpc,
some of the topology info is restricted in environment
like virtualized platform. Hence this test needs to be
skipped in pSeries plat
/proc/cpuinfo provides information about type of processor, number
of CPU's etc. Reading /proc/cpuinfo file outputs useful information
by field name like cpu, platform, model (depending on architecture)
and its value separated by colon.
Add new utility function "cpuinfo_field" in "util/header.c" w
The session topology test fails in powerpc pSeries platform.
Test logs:
<<>>
Session topology : FAILED!
<<>>
This testcases tests cpu topology by checking the core_id and
socket_id stored in perf_env from perf session. The data from
perf session is compared with the cpu topology information
from "
Perf BPF filter test fails in environment where "clang"
is not installed.
Test failure logs:
<<>>
42: BPF filter:
42.1: Basic BPF filtering : Skip
42.2: BPF pinning : FAILED!
42.3: BPF prologue generation : FAILED!
<<>>
Enabling verbose option
The NR_CPUS on Linux kernel ranges from 1-8192. So let's match
NR_CPUS with max NR_CPUS count on Linux kernel.
Signed-off-by: Sourabh Jain
---
defs.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/defs.h b/defs.h
index 1e8360d..a6735d0 100644
--- a/defs.h
+++ b/defs.h
@@ -13
On 05/05/22 15:48, Sourabh Jain wrote:
The NR_CPUS on Linux kernel ranges from 1-8192. So let's match
NR_CPUS with max NR_CPUS count on Linux kernel.
Signed-off-by: Sourabh Jain
---
defs.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/defs.h b/defs.h
index 1e8360d..a6
On Thu, May 5, 2022 at 10:56 AM Ilpo Järvinen
wrote:
> On Wed, 4 May 2022, Arnd Bergmann wrote:
> > On Wed, May 4, 2022 at 10:33 AM Ilpo Järvinen
> > wrote:
> > > On Wed, 4 May 2022, Arnd Bergmann wrote:
> > > > On Wed, May 4, 2022 at 9:20 AM Ilpo Järvinen
> > > > wrote:
> > > > >
> > > > After
-Original Message-
From: Athira Rajeev
To: a...@kernel.org, jo...@kernel.org, disg...@linux.vnet.ibm.com
Cc: m...@ellerman.id.au, linux-perf-us...@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, ma...@linux.vnet.ibm.com,
rnsas...@linux.ibm.com, kj...@linux.ibm.com, irog...@google.com
S
On 5/5/22 15:09, Athira Rajeev wrote:
> The session topology test fails in powerpc pSeries platform.
> Test logs:
> <<>>
> Session topology : FAILED!
> <<>>
>
> This test uses cpu topology information and in powerpc,
> some of the topology info is restricted in environment
> like virtualized pl
t;>
>> >> Thanks!
>> >>
>> >> Can we have this applied now?
>> >
>> > I think Michael Ellerman could help with this?
>> >
>> > Michael?
>>
>> Yep, I'll pick it up when I start putting things into next.
>>
>> That's usually the week after rc2, but I had a break for Easter.
>
> Any new on this? I haven't seen it yet in Linux Next.
It's in today's next (next-20220505).
cheers
On Thu, May 05, 2022 at 09:04:46PM +1000, Michael Ellerman wrote:
> Andy Shevchenko writes:
> > On Thu, Apr 21, 2022 at 08:42:30AM +1000, Michael Ellerman wrote:
...
> > Any new on this? I haven't seen it yet in Linux Next.
>
> It's in today's next
Other arches (sh, mips, hexagon) use standard names for PAGE_SIZE
related config symbols.
Add matching symbols for powerpc, which are enabled by default but
depend on our architecture specific PAGE_SIZE symbols.
This allows generic/driver code to express dependencies on the PAGE_SIZE
without need
In the previous commit powerpc added PAGE_SIZE related config symbols
using the generic names.
So there's no need to refer to them in the definition of
PAGE_SIZE_LESS_THAN_64KB etc, the negative dependency on the generic
symbol is sufficient (in this case !PAGE_SIZE_64KB).
Signed-off-by: Michael
On Thu, May 05, 2022 at 02:39:43PM +0800, Tong Tiangen wrote:
> 在 2022/5/4 18:26, Catalin Marinas 写道:
> > On Wed, Apr 20, 2022 at 03:04:15AM +, Tong Tiangen wrote:
> > > Add copy_{to, from}_user() to machine check safe.
> > >
> > > If copy fail due to hardware memory error, only the relevant p
On Thu, May 5, 2022 at 4:24 PM Masahiro Yamada wrote:
>
> Currently, enum export is tristate, but export_unknown does not make
> sense in any way.
>
> If the symbol name starts with "__ksymtab_", but the section name
> does not start with "___ksymtab+" or "___ksymtab_gpl+", it is not
> an exported
"Naveen N. Rao" writes:
> Stop using the ftrace trampoline for init section once kernel init is
> complete.
>
> Fixes: 67361cf8071286 ("powerpc/ftrace: Handle large kernel configs")
> Cc: sta...@vger.kernel.org # v4.20+
> Signed-off-by: Naveen N. Rao
> ---
> arch/powerpc/include/asm/ftrace.h |
With CONFIG_FORTIFY_SOURCE enabled, string functions will also perform
dynamic checks for string size which can panic the kernel,
like incase of overflow detection.
In papr_scm, papr_scm_pmu_check_events function uses stat->stat_id
with string operations, to populate the nvdimm_events_map array.
S
On Wed, May 4, 2022 at 1:09 PM Pali Rohár wrote:
>
> DT law_trgt_if property defines Local Access Window Target Interface.
Documentation?
fsl,law-trgt-if would be the preferred form.
> Local Access Window Target Interface is used for identifying individual
> peripheral and mapping its memory to
On Thursday 05 May 2022 10:40:09 Rob Herring wrote:
> On Wed, May 4, 2022 at 1:09 PM Pali Rohár wrote:
> >
> > DT law_trgt_if property defines Local Access Window Target Interface.
>
> Documentation?
I was not able to find it :-( So the only documentation for me was the
source code and decoding
On Wed, May 04, 2022 at 11:31:28PM +0200, Arnd Bergmann wrote:
> On Wed, May 4, 2022 at 11:08 PM Bjorn Helgaas wrote:
> > On Fri, Apr 29, 2022 at 03:49:59PM +0200, Niklas Schnelle wrote:
> > > We introduce a new HAS_IOPORT Kconfig option to indicate support for
> > > I/O Port access. In a future p
-20220427
arm randconfig-c002-20220427
powerpc randconfig-c003-20220427
powerpc randconfig-c003-20220505
arm randconfig-c002-20220505
mips randconfig-c004-20220505
s390 randconfig-c005-20220505
riscv
Le 04/05/2022 à 14:39, Christophe Leroy a écrit :
Le 18/04/2022 à 09:38, Naveen N. Rao a écrit :
Christophe Leroy wrote:
PPC_RAW_xxx() macros are self explanatory and less error prone
than open coding.
Use them in ftrace.c
Signed-off-by: Christophe Leroy
---
arch/powerpc/include/asm/p
On Thu, May 5, 2022 at 4:24 PM Masahiro Yamada wrote:
>
>
> This is the third batch of cleanups in this development cycle.
This series is available at:
git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
lto-cleanup-v3
--
Best Regards
Masahiro Yamada
Em Thu, May 05, 2022 at 03:30:39PM +0530, Athira Rajeev escreveu:
> Perf BPF filter test fails in environment where "clang"
> is not installed.
>
> Test failure logs:
>
> <<>>
> 42: BPF filter:
> 42.1: Basic BPF filtering : Skip
> 42.2: BPF pinning :
Em Thu, May 05, 2022 at 03:09:59PM +0530, Athira Rajeev escreveu:
> /proc/cpuinfo provides information about type of processor, number
> of CPU's etc. Reading /proc/cpuinfo file outputs useful information
> by field name like cpu, platform, model (depending on architecture)
> and its value separate
On Thu, May 05, 2022 at 07:30:47AM +, Christophe Leroy wrote:
>
>
> Le 04/05/2022 à 17:40, Clément Léger a écrit :
> > Add function which allows to dynamically allocate and free properties.
> > Use this function internally for all code that used the same logic
> > (mainly __of_prop_dup()).
>
On Thu, May 5, 2022 at 6:10 PM Bjorn Helgaas wrote:
> On Wed, May 04, 2022 at 11:31:28PM +0200, Arnd Bergmann wrote:
> >
> > The main goal is to avoid c), which is what happens on s390, but
> > can also happen elsewhere. Catching b) would be nice as well,
> > but is much harder to do from generic
On Wed, May 04, 2022 at 05:40:31PM +0200, Clément Léger wrote:
> Add function which allows to dynamically allocate and free properties.
> Use this function internally for all code that used the same logic
> (mainly __of_prop_dup()).
>
> Signed-off-by: Clément Léger
> ---
> drivers/of/dynamic.c |
On Wed, May 04, 2022 at 05:40:32PM +0200, Clément Léger wrote:
> Add functions which allows to create and free nodes.
>
> Signed-off-by: Clément Léger
> ---
> drivers/of/dynamic.c | 59
> include/linux/of.h | 9 +++
> 2 files changed, 58 insert
On Thu, May 05, 2022 at 07:39:42PM +0200, Arnd Bergmann wrote:
> On Thu, May 5, 2022 at 6:10 PM Bjorn Helgaas wrote:
> > On Wed, May 04, 2022 at 11:31:28PM +0200, Arnd Bergmann wrote:
> > >
> > > The main goal is to avoid c), which is what happens on s390, but
> > > can also happen elsewhere. Catc
On 28/04/22 4:19 am, Guilherme G. Piccoli wrote:
The panic notifiers infrastructure is a bit limited in the scope of
the callbacks - basically every kind of functionality is dropped
in a list that runs in the same point during the kernel panic path.
This is not really on par with the complexit
On 05/05/2022 15:55, Hari Bathini wrote:
> [...]
>
> The change looks good. I have tested it on an LPAR (ppc64).
>
> Reviewed-by: Hari Bathini
Thanks a bunch Hari, much appreciated!
On Thu, May 05, 2022 at 04:22:30PM +0900 Masahiro Yamada wrote:
> The 'static' specifier and EXPORT_SYMBOL() are an odd combination.
>
> Since commit 15bfc2348d54 ("modpost: check for static EXPORT_SYMBOL*
> functions"), modpost tries to detect it, but there are false negatives.
>
> Here is the s
On Thu, May 05, 2022 at 10:48:55PM +0900 Masahiro Yamada wrote:
> On Thu, May 5, 2022 at 4:24 PM Masahiro Yamada wrote:
> >
> > Currently, enum export is tristate, but export_unknown does not make
> > sense in any way.
> >
> > If the symbol name starts with "__ksymtab_", but the section name
> > d
On Thu, May 05, 2022 at 04:22:32PM +0900 Masahiro Yamada wrote:
> add_intree_flag(), add_retpoline(), and add_staging_flag() are small
> enough to be merged into add_header().
>
> Signed-off-by: Masahiro Yamada
> ---
>
> Changes in v3:
> - New patch
>
> scripts/mod/modpost.c | 25 +++
On Thu, May 05, 2022 at 04:22:33PM +0900 Masahiro Yamada wrote:
> A later commit will add more code to this list_for_each_entry loop.
>
> Before that, move the loop body into a separate helper function.
>
> Signed-off-by: Masahiro Yamada
> ---
>
> Changes in v3:
> - New patch
>
> scripts/mo
On Thu, May 05, 2022 at 04:22:36PM +0900 Masahiro Yamada wrote:
> Currently, CONFIG_MODVERSIONS needs extra link to embed the symbol
> versions into ELF objects. Then, modpost extracts the version CRCs
> from them.
>
> The following figures show how it currently works, and how I am trying
> to cha
On Thu, May 05, 2022 at 04:22:39PM +0900 Masahiro Yamada wrote:
> Make genksyms output symbol versions in the format modpost expects,
> so the 'sed' is unneeded.
>
> This commit makes *.symversions completely unneeded.
>
> I will keep *.symversions in .gitignore and 'make clean' for a while.
> Ot
On Thu, May 05, 2022 at 04:22:38PM +0900 Masahiro Yamada wrote:
> Now modpost reads symbol versions from .*.cmd files.
>
> These merged *.symversions are not used any more.
>
> Signed-off-by: Masahiro Yamada
> ---
>
> (no changes since v1)
>
> scripts/Makefile.build | 21 ++--
On Thu, May 05, 2022 at 04:22:41PM +0900 Masahiro Yamada wrote:
> ->is_static is set to true at allocation, then to false if the symbol
> comes from the dump file.
>
> It is simpler to use !mod->from_dump as the init value.
>
> Signed-off-by: Masahiro Yamada
> ---
>
> (no changes since v2)
>
>
On Thu, May 05, 2022 at 04:22:43PM +0900 Masahiro Yamada wrote:
> Kbuild runs at the top of objtree instead of changing the working
> directory to subdirectories. I think this design is nice overall but
> some commands have a scapability issue.
>
> The build command of built-in.a is one of them wh
On Thu, May 05, 2022 at 04:22:44PM +0900 Masahiro Yamada wrote:
> Like built-in.a, the command length of the *.mod rule scales with
> the depth of the directory times the number of objects in the Makefile.
>
> Add $(obj)/ by the shell command (awk) instead of by Make's builtin
> function.
>
> In-
On 5/5/22 02:31, Pali Rohár wrote:
> Hello!
>
> On Thursday 05 May 2022 07:16:40 Christophe Leroy wrote:
>> Le 04/05/2022 à 19:57, Pali Rohár a écrit :
>>> Since commit 63a72284b159 ("powerpc/pci: Assign fixed PHB number based on
>>> device-tree properties"), powerpc kernel always fallback to PCI
On Thursday 05 May 2022 15:10:01 Tyrel Datwyler wrote:
> On 5/5/22 02:31, Pali Rohár wrote:
> > Hello!
> >
> > On Thursday 05 May 2022 07:16:40 Christophe Leroy wrote:
> >> Le 04/05/2022 à 19:57, Pali Rohár a écrit :
> >>> Since commit 63a72284b159 ("powerpc/pci: Assign fixed PHB number based on
>
On 4/29/22 01:14, Baolin Wang wrote:
> It is incorrect to use ptep_clear_flush() to nuke a hugetlb page
> table when unmapping or migrating a hugetlb page, and will change
> to use huge_ptep_clear_flush() instead in the following patches.
>
> So this is a preparation patch, which changes the huge_
On 4/29/22 01:14, Baolin Wang wrote:
> On some architectures (like ARM64), it can support CONT-PTE/PMD size
> hugetlb, which means it can support not only PMD/PUD size hugetlb:
> 2M and 1G, but also CONT-PTE/PMD size: 64K and 32M if a 4K page
> size specified.
> diff --git a/mm/rmap.c b/mm/rmap.c
Hi,
This is the sixth version of this patchset. It again took me a while to
post this version as I have been working on other projects and implemented
major reworks in the series.
This work has gone through several versions. I have incorporated feedback
from Thomas Gleixner and others. Many of th
Certain types of interrupts, such as NMI, do not have an associated vector.
They, however, target specific CPUs. Thus, when assigning the destination
CPU, it is beneficial to select the one with the lowest number of vectors.
Prepend the functions matrix_find_best_cpu_managed() and
matrix_find_best_
Currently, the delivery mode of all interrupts is set to the mode of the
APIC driver in use. There are no restrictions in hardware to configure the
delivery mode of each interrupt individually. Also, certain IRQs need to be
configured with a specific delivery mode (e.g., NMI).
Add a new member, de
There are no restrictions in hardware to set MSI messages with its
own delivery mode. Use the mode specified in the provided IRQ hardware
configuration data. Since most of the IRQs are configured to use the
delivery mode of the APIC driver in use (set in all of them to
APIC_DELIVERY_MODE_FIXED), t
There are cases in which it is necessary to set the delivery mode of an
interrupt as NMI. Add a new flag that callers can specify when allocating
an IRQ.
Cc: Andi Kleen
Cc: "Ravi V. Shankar"
Cc: Stephane Eranian
Cc: io...@lists.linux-foundation.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: x...@ker
Vectors are meaningless when allocating IRQs with NMI as the delivery mode.
In such case, skip the reservation of IRQ vectors. Do it in the lowest-
level functions where the actual IRQ reservation takes place.
Since NMIs target specific CPUs, keep the functionality to find the best
CPU.
Cc: Andi
The flag X86_IRQ_ALLOC_AS_NMI indicates to the interrupt controller that
it should configure the delivery mode of an IRQ as NMI. Implement such
request. This causes irq_domain children in the hierarchy to configure
their irq_chips accordingly. When no specific delivery mode is requested,
continue u
When the destination mode of an interrupt is physical APICID, the interrupt
is delivered only to the single CPU of which the physical APICID is
specified in the destination ID field. Therefore, the redirection hint is
meaningless.
Furthermore, on certain processors, the IOMMU does not deliver the
struct irq_cfg::delivery_mode specifies the delivery mode of each IRQ
separately. Configuring the delivery mode of an IRTE would require adding
a third argument to prepare_irte(). Instead, simply take a pointer to the
irq_cfg for which an IRTE is being configured. This change does not cause
functio
There are no hardware requirements to use the same delivery mode for all
interrupts. Use the mode specified in the provided IRQ hardware
configuration data. Since all IRQs are configured to use the delivery mode
of the APIC drive, the only functional changes are where IRQs are
configured to use a s
The Intel IOMMU interrupt remapping driver already programs correctly the
delivery mode of individual irqs as per their irq_data. Improve handling
of NMIs. Allow only one irq per NMI. Also, it is not necessary to cleanup
irq vectors after updating affinity. NMIs do not have associated vectors.
Cc:
These functions are used to check and set specific bits in a Device Table
Entry. For instance, they can be used to modify the setting of the NMIPass
field.
Currently, these functions are used only for ACPI-specified devices.
However, an interrupt is to be allocated with NMI as delivery mode, the
D
As per the AMD I/O Virtualization Technology (IOMMU) Specification, the
AMD IOMMU only remaps fixed and arbitrated MSIs. NMIs are controlled
by the NMIPass bit of a Device Table Entry. When set, the IOMMU passes
through NMI interrupt messages unmapped. Otherwise, they are aborted.
Furthermore, Sec
If NMIPass is enabled in a device's DTE, the IOMMU lets NMI interrupt
messages pass through unmapped. Therefore, the contents of the MSI
message, not an IRTE, determine how and where the NMI is delivered.
Since the IOMMU driver owns the MSI message of the NMI irq, compose
it using the non-interrup
In order to allow hpet_writel() to be used by other components (e.g.,
the HPET-based hardlockup detector), expose it in the HPET header file.
Cc: Andi Kleen
Cc: Stephane Eranian
Cc: "Ravi V. Shankar"
Cc: io...@lists.linux-foundation.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: x...@kernel.org
Revi
Programming an HPET channel as periodic requires setting the
HPET_TN_SETVAL bit in the channel configuration. Plus, the comparator
register must be written twice (once for the comparator value and once for
the periodic value). Since this programming might be needed in several
places (e.g., the HPET
The flag X86_ALLOC_AS_NMI indicates that the IRQs to be allocated in an
IRQ domain need to be configured as NMIs. Add an as_nmi argument to
hpet_assign_irq(). Even though the HPET clock events do not need NMI
IRQs, the HPET hardlockup detector does. A subsequent changeset will
implement the reserv
The HPET hardlockup detector needs a dedicated HPET channel. Hence, create
a new HPET_MODE_NMI_WATCHDOG mode category to indicate that it cannot be
used for other purposes. Using MSI interrupts greatly simplifies the
implementation of the detector. Specifically, it helps to avoid the
complexities o
The procedure to detect hardlockups is independent of the underlying
mechanism that generates the non-maskable interrupt used to drive the
detector. Thus, it can be put in a separate, generic function. In this
manner, it can be invoked by various implementations of the NMI watchdog.
For this purpo
The current default implementation of the hardlockup detector assumes that
it is implemented using perf events. However, the hardlockup detector can
be driven by other sources of non-maskable interrupts (e.g., a properly
configured timer).
Group and wrap in #ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF a
Certain implementations of the hardlockup detector require support for
Inter-Processor Interrupt shorthands. On x86, support for these can only
be determined after all the possible CPUs have booted once (in
smp_init()). Other architectures may not need such check.
lockup_detector_init() only perfo
Add a NMI_WATCHDOG as a new category of NMI handler. This new category
is to be used with the HPET-based hardlockup detector. This detector
does not have a direct way of checking if the HPET timer is the source of
the NMI. Instead, it indirectly estimates it using the time-stamp counter.
Therefore
Implement a hardlockup detector that uses an HPET channel as the source
of the non-maskable interrupt. Implement the basic functionality to
start, stop, and configure the timer.
Designate as the handling CPU one of the CPUs that the detector monitors.
Use it to service the NMI from the HPET channe
It is not possible to determine the source of a non-maskable interrupt
(NMI) in x86. When dealing with an HPET channel, the only direct method to
determine whether it caused an NMI would be to read the Interrupt Status
register.
However, reading HPET registers is slow and, therefore, not to be don
Prepare hardlockup_panic_setup() to handle a comma-separated list of
options. Thus, it can continue parsing its own command-line options while
ignoring parameters that are relevant only to specific implementations of
the hardlockup detector. Such implementations may use an early_param to
parse thei
Keep the HPET-based hardlockup detector disabled unless explicitly enabled
via a command-line argument. If such parameter is not given, the
initialization of the HPET-based hardlockup detector fails and the NMI
watchdog will fall back to use the perf-based implementation.
Implement the command-lin
The generic hardlockup detector is based on perf. It also provides a set
of weak functions that CPU architectures can override. Add a shim
hardlockup detector for x86 that overrides such functions and can
select between perf and HPET implementations of the detector.
For clarity, add the intermedia
When there are multiple implementations of the NMI watchdog, there may be
situations in which switching from one to another is needed. If the time-
stamp counter becomes unstable, the HPET-based NMI watchdog can no longer
be used. Similarly, the HPET-based NMI watchdog relies on tsc_khz and
needs t
The HPET hardlockup detector relies on tsc_khz to estimate the value of
that the TSC will have when its HPET channel fires. A refined tsc_khz
helps to estimate better the expected TSC value.
Using the early value of tsc_khz may lead to a large error in the expected
TSC value. Restarting the NMI wa
The HPET-based hardlockup detector relies on the TSC to determine if an
observed NMI interrupt was originated by HPET timer. Hence, this detector
can no longer be used with an unstable TSC.
In such case, permanently stop the HPET-based hardlockup detector and
start the perf-based detector.
Cc: An
Hello:
This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski :
On Wed, 4 May 2022 13:32:17 +0200 you wrote:
> powerpc's asm/prom.h includes some headers that it doesn't
> need itself.
>
> In order to clean powerpc's asm/prom.h up in a further step,
> first clean all files tha
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