在 2025/2/15 1:24, Catalin Marinas 写道:
On Fri, Feb 14, 2025 at 10:49:01AM +0800, Tong Tiangen wrote:
在 2025/2/13 1:11, Catalin Marinas 写道:
On Mon, Dec 09, 2024 at 10:42:56AM +0800, Tong Tiangen wrote:
Currently, many scenarios that can tolerate memory errors when copying page
have been suppo
PTRACE_SET_SYSCALL_INFO is a generic ptrace API that complements
PTRACE_GET_SYSCALL_INFO by letting the ptracer modify details of
system calls the tracee is blocked in.
This API allows ptracers to obtain and modify system call details in a
straightforward and architecture-agnostic way, providing a
At first, vertical low CPUs will be parked generally. This will later
be adjusted by making the parked state dependent on the overall
utilization on the underlying hypervisor.
Vertical lows are always bound to the highest CPU IDs. This implies that
the three types of vertically polarized CPUs are
A parked CPU is considered to be flagged as unsuitable to process
workload at the moment, but might be become usable anytime. Depending on
the necessity for additional computation power and/or available capacity
of the underlying hardware.
A scheduler group is considered to be parked, if there are
Parked CPUs should not be considered to be available for computation.
This implies, that they should also not contribute to the overall weight
of scheduler groups, as a large group of parked CPUs should not attempt
to process any tasks, hence, a small group of non-parked CPUs should be
considered t
Changes to v1
parked vs idle
- parked CPUs are now never considered to be idle
- a scheduler group is now considered parked iff there are parked CPUs
and there are no idle CPUs, i.e. all non parked CPUs are busy or there
are only parked CPUs. A scheduler group with parked tasks can be
consi
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Hi Linus,
Please pull couple of powerpc fixes for 6.14:
The following changes since commit a64dcfb451e254085a7daee5fe51bf22959d52d3:
Linux 6.14-rc2 (2025-02-09 12:45:03 -0800)
are available in the git repository at:
https://git.kernel.org/pu
On Mon, Feb 17, 2025 at 10:31:08AM +0100, Miquel Raynal wrote:
> Hello,
>
> >> > In some scenarios, such as under the Freescale eLBC bus, there are raw
> >> > NAND chips with a unit address that has a comma in it (cs,offset).
> >> > Relax the $nodename pattern in raw-nand-chip.yaml to allow such u
Hello,
>> > In some scenarios, such as under the Freescale eLBC bus, there are raw
>> > NAND chips with a unit address that has a comma in it (cs,offset).
>> > Relax the $nodename pattern in raw-nand-chip.yaml to allow such unit
>> > addresses.
>>
>> This is super specific to this controller, I'd
This function is going to be needed on all HAVE_ARCH_TRACEHOOK
architectures to implement PTRACE_SET_SYSCALL_INFO API.
This partially reverts commit 7962c2eddbfe ("arch: remove unused
function syscall_set_arguments()") by reusing some of old
syscall_set_arguments() implementations.
Signed-off-by:
Similar to syscall_set_arguments() that complements
syscall_get_arguments(), introduce syscall_set_nr()
that complements syscall_get_nr().
syscall_set_nr() is going to be needed along with
syscall_set_arguments() on all HAVE_ARCH_TRACEHOOK
architectures to implement PTRACE_SET_SYSCALL_INFO API.
S
Hello Alexandru,
On Monday, February 10, 2025, 1:04:29 PM, you wrote:
> Hi Drew,
> On Mon, Feb 10, 2025 at 02:56:25PM +0100, Andrew Jones wrote:
>> On Mon, Feb 10, 2025 at 10:41:53AM +, Alexandru Elisei wrote:
>> > Hi Drew,
>> >
>> > On Tue, Jan 21, 2025 at 03:48:55PM +0100, Andrew Jones wr
On Mon, Feb 17, 2025 at 04:07:49PM +0800, Tong Tiangen wrote:
> 在 2025/2/15 1:24, Catalin Marinas 写道:
> > On Fri, Feb 14, 2025 at 10:49:01AM +0800, Tong Tiangen wrote:
> > > 在 2025/2/13 1:11, Catalin Marinas 写道:
> > > > On Mon, Dec 09, 2024 at 10:42:56AM +0800, Tong Tiangen wrote:
> > > > > Current
From: Thierry Reding
This enables the syscore callbacks to obtain the clock context without
relying on a separate global variable.
Signed-off-by: Thierry Reding
---
drivers/clk/mvebu/common.c | 21 ++---
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/clk
From: Thierry Reding
Pass a pointer to the syscore_ops structure that was registered to the
callbacks. This enables callbacks to act on instance data (syscore_ops
can be embedded into other structures, and driver-specific data can be
obtained using container_of()) rather than the current practice
From: Thierry Reding
Hi,
Something that's been bugging me over the years is how some drivers have
had to adopt file-scoped variables to pass data into something like the
syscore operations. This is often harmless, but usually leads to drivers
not being able to deal with multiple instances, or ad
From: Thierry Reding
This enables the syscore callbacks to obtain the TCU context without
relying on a separate global variable.
Signed-off-by: Thierry Reding
---
drivers/clk/ingenic/tcu.c | 54 ++-
1 file changed, 25 insertions(+), 29 deletions(-)
diff --g
From: Thierry Reding
This enables the syscore callbacks to obtain the IRQ chip context
without relying on a separate global variable.
Signed-off-by: Thierry Reding
---
drivers/irqchip/irq-imx-gpcv2.c | 29 +++--
1 file changed, 11 insertions(+), 18 deletions(-)
diff --
From: Thierry Reding
This enables the syscore callbacks to obtain the mbus context without
relying on a separate global variable.
Signed-off-by: Thierry Reding
---
drivers/bus/mvebu-mbus.c | 20
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/bus/mve
As reported by the kernel test robot, the following error occurs:
arch/powerpc/lib/sstep.c: In function 'analyse_instr':
>> arch/powerpc/lib/sstep.c:1172:28: warning: variable 'suffix' set but not
>> used [-Wunused-but-set-variable]
1172 | unsigned int word, suffix;
|
From: Thierry Reding
This enables the syscore callbacks to obtain the PCI context without
relying on a separate global variable.
Signed-off-by: Thierry Reding
---
arch/mips/pci/pci-alchemy.c | 24
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/arch/mip
From: Thierry Reding
Rather than relying on a global variable, make use of the fact that the
syscore ops are embedded in the PMC context and can be obtained via
container_of().
Signed-off-by: Thierry Reding
---
drivers/soc/tegra/pmc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/driv
The pull request you sent on Mon, 17 Feb 2025 15:40:00 +0530:
> https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
> tags/powerpc-6.14-3
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/6186bdd120eccf4ca44fcba8967fc59ea50b11b8
Thank you!
--
Deet-doot-d
Main updates since v6:
- Clean ups and fixes based on feedback from David and Dan.
- Rebased from next-20241216 to v6.14-rc1. No conflicts.
- Dropped the PTE bit removals and clean-ups - will post this as a
separate series to be merged after this one as Dan wanted it split
up more and t
FS DAX requires file systems to call into the DAX layout prior to unlinking
inodes to ensure there is no ongoing DMA or other remote access to the
direct mapped page. The fuse file system implements
fuse_dax_break_layouts() to do this which includes a comment indicating
that passing dmap_end == 0 l
dax_layout_busy_page_range() is used by file systems to scan the DAX
page-cache to unmap mapping pages from user-space and to determine if
any pages in the given range are busy, either due to ongoing DMA or
other get_user_pages() usage.
Currently it checks to see the file mapping is mapped into us
Due to include chain (below), powerpc's asm-compat.h is part of UAPI,
thus it should use the __clang__ macro to directly detect whether Clang
is used rather then relying on the kernel config setting. The later is
unreliable because the userspace tools that uses UAPI may be compile
with a different
The page ->mapping pointer can have magic values like
PAGE_MAPPING_DAX_SHARED and PAGE_MAPPING_ANON for page owner specific
usage. Currently PAGE_MAPPING_DAX_SHARED and PAGE_MAPPING_ANON alias to the
same value. This isn't a problem because FS DAX pages are never seen by the
anonymous mapping code
PCI P2PDMA pages are not mapped with pXX_devmap PTEs therefore the
check in __gup_device_huge() is redundant. Remove it
Signed-off-by: Alistair Popple
Reviewed-by: Jason Gunthorpe
Reviewed-by: Dan Wiliams
Acked-by: David Hildenbrand
---
mm/gup.c | 5 -
1 file changed, 5 deletions(-)
diff
On 2/17/25 17:02, Tobias Huschle wrote:
Changes to v1
parked vs idle
- parked CPUs are now never considered to be idle
- a scheduler group is now considered parked iff there are parked CPUs
and there are no idle CPUs, i.e. all non parked CPUs are busy or there
are only parked CPUs. A sc
Hi Tobias.
On 2/17/25 17:02, Tobias Huschle wrote:
A parked CPU is considered to be flagged as unsuitable to process
workload at the moment, but might be become usable anytime. Depending on
the necessity for additional computation power and/or available capacity
of the underlying hardware.
A sc
Hello,
how does this happen?
On Tue, Feb 18, 2025 at 12:48:01PM +0800, Shung-Hsi Yu wrote:
> Due to include chain (below), powerpc's asm-compat.h is part of UAPI,
> thus it should use the __clang__ macro to directly detect whether Clang
> is used rather then relying on the kernel config setting.
> On 13 Feb 2025, at 9:04 AM, Namhyung Kim wrote:
>
> On Thu, Feb 13, 2025 at 12:24:38AM +0530, Athira Rajeev wrote:
>> "Tool PMU" tests fails on powerpc as below:
>>
>> 12.1: Parsing without PMU name:
>> --- start ---
>> test child forked, pid 48492
>> Using CPUID 0x00800200
>> Atte
On 12/02/2025 1:19 pm, Athira Rajeev wrote:
Perf probe on vfs_fstatat fails as below on a powerpc system
./perf probe -nf --max-probes=512 -a 'vfs_fstatat $params'
Segmentation fault (core dumped)
This is observed while running perftool-testsuite_probe testcase.
While running with verbose,
Prior to freeing a block file systems supporting FS DAX must check
that the associated pages are both unmapped from user-space and not
undergoing DMA or other access from eg. get_user_pages(). This is
achieved by unmapping the file range and scanning the FS DAX
page-cache to see if any pages within
Currently fs dax pages are considered free when the refcount drops to
one and their refcounts are not increased when mapped via PTEs or
decreased when unmapped. This requires special logic in mm paths to
detect that these pages should not be properly refcounted, and to
detect when the refcount drop
The rmap doesn't currently support adding a PUD mapping of a
folio. This patch adds support for entire PUD mappings of folios,
primarily to allow for more standard refcounting of device DAX
folios. Currently DAX is the only user of this and it doesn't require
support for partially mapped PUD-sized
Prior to any truncation operations file systems call
dax_break_mapping() to ensure pages in the range are not under going
DMA. Later DAX page-cache entries will be removed by
truncate_folio_batch_exceptionals() in the generic page-cache code.
However this makes it possible for folios to be removed
Several functions internal to FS DAX use the following pattern when
trying to obtain an unlocked entry:
xas_for_each(&xas, entry, end_idx) {
if (dax_is_locked(entry))
entry = get_unlocked_entry(&xas, 0);
This is problematic because get_unlocked_entry() will get the next
pr
File systems call dax_break_mapping() prior to reallocating file system
blocks to ensure the page is not undergoing any DMA or other
accesses. Generally this is needed when a file is truncated to ensure that
if a block is reallocated nothing is writing to it. However filesystems
currently don't cal
A FS DAX page is considered idle when its refcount drops to one. This
is currently open-coded in all file systems supporting FS DAX. Move
the idle detection to a common function to make future changes easier.
Signed-off-by: Alistair Popple
Reviewed-by: Jan Kara
Reviewed-by: Christoph Hellwig
Re
In preparation for using insert_page() for DAX, enhance
insert_page_into_pte_locked() to handle establishing writable
mappings. Recall that DAX returns VM_FAULT_NOPAGE after installing a
PTE which bypasses the typical set_pte_range() in finish_fault.
Signed-off-by: Alistair Popple
Suggested-by:
Zone device pages are used to represent various type of device memory
managed by device drivers. Currently compound zone device pages are
not supported. This is because MEMORY_DEVICE_FS_DAX pages are the only
user of higher order zone device pages and have their own page
reference counting.
A futu
Currently DAX folio/page reference counts are managed differently to
normal pages. To allow these to be managed the same as normal pages
introduce vmf_insert_folio_pud. This will map the entire PUD-sized folio
and take references as it would for a normally mapped page.
This is distinct from the cu
Currently ZONE_DEVICE page reference counts are initialised by core
memory management code in __init_zone_device_page() as part of the
memremap() call which driver modules make to obtain ZONE_DEVICE
pages. This initialises page refcounts to 1 before returning them to
the driver.
This was presumabl
Currently DAX folio/page reference counts are managed differently to normal
pages. To allow these to be managed the same as normal pages introduce
vmf_insert_folio_pmd. This will map the entire PMD-sized folio and take
references as it would for a normally mapped page.
This is distinct from the cu
From: Dan Williams
The dcssblk driver has long needed special case supoprt to enable
limited dax operation, so called CONFIG_FS_DAX_LIMITED. This mode
works around the incomplete support for ZONE_DEVICE on s390 by forgoing
the ability of dax-mapped pages to support GUP.
Now, pending cleanups to
Currently to map a DAX page the DAX driver calls vmf_insert_pfn. This
creates a special devmap PTE entry for the pfn but does not take a
reference on the underlying struct page for the mapping. This is
because DAX page refcounts are treated specially, as indicated by the
presence of a devmap entry.
Longterm pinning of FS DAX pages should already be disallowed by
various pXX_devmap checks. However a future change will cause these
checks to be invalid for FS DAX pages so make
folio_is_longterm_pinnable() return false for FS DAX pages.
Signed-off-by: Alistair Popple
Reviewed-by: John Hubbard
Device DAX pages are currently not reference counted when mapped,
instead relying on the devmap PTE bit to ensure mapping code will not
get/put references. This requires special handling in various page
table walkers, particularly GUP, to manage references on the
underlying pgmap to ensure the page
> On 13 Feb 2025, at 9:04 AM, Namhyung Kim wrote:
>
> On Thu, Feb 13, 2025 at 12:24:38AM +0530, Athira Rajeev wrote:
>> "Tool PMU" tests fails on powerpc as below:
>>
>> 12.1: Parsing without PMU name:
>> --- start ---
>> test child forked, pid 48492
>> Using CPUID 0x00800200
>> Att
On Mon, 13 Jan 2025 17:06:16 +, Yury Khrustalev wrote:
> Add PKEY_UNRESTRICTED macro to mman.h and use it in selftests.
>
> For context, this change will also allow for more consistent update of the
> Glibc manual which in turn will help with introducing memory protection
> keys on AArch64 tar
On Thu Feb 6, 2025 at 6:41 PM AEST, Dan Horák wrote:
> Hi,
>
> I am getting a kernel panic on my Raptor Talos Power9 system after
> updating to the 6.14-rc1 kernel from 6.13. Seems reproducable every
> time, but I haven't start bisecting yet. Does it sound familiar to
> anyone?
No, but it's possib
On 17.02.25 05:29, Alistair Popple wrote:
On Mon, Feb 10, 2025 at 07:45:09PM +0100, David Hildenbrand wrote:
On 04.02.25 23:48, Alistair Popple wrote:
Currently DAX folio/page reference counts are managed differently to normal
pages. To allow these to be managed the same as normal pages introdu
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