On 10/12/23 10:03 PM, Hari Bathini wrote:
Most BPF programs are small, but they consume a page each. For systems
with busy traffic and many BPF programs, this may also add significant
pressure on instruction TLB. High iTLB pressure usually slows down the
whole system causing visible performance
Rather than propagating the CPU number of the preempted lock owner,
just propagate whether the owner was preempted. Waiters must read the
lock value when yielding to it to prevent races anyway, so might as
well always load the owner CPU from the lock.
To further simplify the code, also don't
On Mon, Oct 16, 2023 at 12:08:56PM +, Chancel Liu wrote:
> Thanks Mark and Rob for your advice. In fact, it's common use case. We can see
> many drivers set widgets ignoring suspend. I will remove the linux specifics
> and focus on the key concept. How about the modification on the property
On 13/10/2023 10:31, Shengjiu Wang wrote:
> Audio memory to memory virtual driver use video memory to memory
> virtual driver vim2m.c as example. The main difference is
> device type is VFL_TYPE_AUDIO and device cap type is V4L2_CAP_AUDIO_M2M.
>
> The device_run function is a dummy function,
Hej,
On Thu, Sep 28, 2023, at 01:47, Jason Gunthorpe wrote:
> This flag just caches if the IO page size is larger than the CPU
> PAGE_SIZE. This only needs to be checked in two places so remove the
> confusingly named cache.
>
> dart would like to not support paging domains at all if the IO page
This fixes a long-standing latency bug in the powerpc qspinlock
implementation that quite a few people have reported and helped
out with debugging.
The first patch is a minimal fix that avoids the problem. The
other patches are streamlining and improvements after the fix.
Thanks,
Nick
Nicholas
Hi Shengjiu,
On 13/10/2023 10:31, Shengjiu Wang wrote:
> Fixed point controls are used by the user to configure
> the audio sample rate to driver.
>
> Add V4L2_CID_ASRC_SOURCE_RATE and V4L2_CID_ASRC_DEST_RATE
> new IDs for ASRC rate control.
>
> Signed-off-by: Shengjiu Wang
> ---
>
On 13/10/2023 10:31, Shengjiu Wang wrote:
> Audio signal processing has the requirement for memory to
> memory similar as Video.
>
> This patch is to add this support in v4l2 framework, defined
> new buffer type V4L2_BUF_TYPE_AUDIO_CAPTURE and
> V4L2_BUF_TYPE_AUDIO_OUTPUT, defined new format
On Mon, Oct 16, 2023 at 10:22:11AM -0500, Bjorn Helgaas wrote:
> On Mon, Oct 16, 2023 at 10:45:25AM -0400, Frank Li wrote:
> > On Tue, Oct 10, 2023 at 06:02:36PM +0200, Lorenzo Pieralisi wrote:
> > > On Tue, Oct 10, 2023 at 10:20:12AM -0400, Frank Li wrote:
>
> > > > Ping
> > >
> > > Read and
On Mon, Oct 16, 2023 at 10:22:11AM -0500, Bjorn Helgaas wrote:
> On Mon, Oct 16, 2023 at 10:45:25AM -0400, Frank Li wrote:
> > On Tue, Oct 10, 2023 at 06:02:36PM +0200, Lorenzo Pieralisi wrote:
> > > On Tue, Oct 10, 2023 at 10:20:12AM -0400, Frank Li wrote:
>
> > > > Ping
> > >
> > > Read and
> > I think the key thing
> > here is that these are endpoints that can be active over suspend of
> > the main application processor that the current operating system is
> > running (system DT stuff is an interesting corner case here...), and
> > the example is probably a bit specific. Other
If a queued waiter notices the lock owner or the previous waiter has
been preempted, it attempts to mark the lock sleepy, but it does this
as a try-set operation using the original lock value it got when
queueing, which will become stale as the queue progresses, and the
try-set will fail. Drop
yield_cpu is a sample of a preempted lock holder that gets propagated
back through the queue. Queued waiters use this to yield to the
preempted lock holder without continually sampling the lock word (which
would defeat the purpose of MCS queueing by bouncing the cache line).
The problem is that
> Take the papr-vpd driver's internal mutex when sys_rtas performs
> ibm,get-vpd calls. This prevents sys_rtas(ibm,get-vpd) calls from
> interleaving with sequences performed by the driver, ensuring that
> such sequences are not disrupted.
> @@ -1861,6 +1862,28 @@ SYSCALL_DEFINE1(rtas,
ls1043a add suspend/resume support.
Signed-off-by: Frank Li
---
Notes:
Change from v1 to v2
- Change subject 'a' to 'A'
drivers/pci/controller/dwc/pci-layerscape.c | 91 -
1 file changed, 90 insertions(+), 1 deletion(-)
diff --git
The sleepy (aka lock-owner-is-preempted) condition is propagated down
the queue by each waiter. If a waiter becomes preempted, it can no
longer propagate sleepy. To allow subsequent waiters to yield to the
lock owner, also check the lock owner in this case.
Signed-off-by: Nicholas Piggin
---
ls1021a add suspend/resume support.
Signed-off-by: Frank Li
---
Notes:
change from v1 to v2
- change subject 'a' to 'A'
drivers/pci/controller/dwc/pci-layerscape.c | 88 -
1 file changed, 87 insertions(+), 1 deletion(-)
diff --git
On 13/10/2023 10:31, Shengjiu Wang wrote:
> The audio sample format definition is from alsa,
> the header file is include/uapi/sound/asound.h, but
> don't include this header file directly, because in
> user space, there is another copy in alsa-lib.
> There will be conflict in userspace for
On 10/13/23 7:31 AM, Muhammad Muzammil wrote:
Fixed 'instead' typo
Signed-off-by: Muhammad Muzammil
Michael, I presume you'll pick it up?
Thanks,
Daniel
---
arch/powerpc/net/bpf_jit_comp32.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git
Rename yield_propagate_owner to yield_sleepy_owner, which better
describes what it does (what, not how).
Signed-off-by: Nicholas Piggin
---
arch/powerpc/lib/qspinlock.c | 18 +-
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/lib/qspinlock.c
Difference layerscape chip have not difference exit_from_l2() method.
Using function pointer for ls1028. It prepare for other layerscape
suspend/resume support.
Signed-off-by: Frank Li
---
Notes:
Change from v1 to v2
- change subject 'a' to 'A'
To simplify things, don't propagate the not-sleepy condition back down
the queue. Instead, have the waiters clear their own node->sleepy when
finding the lock owner is not preempted.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/lib/qspinlock.c | 26 --
1 file changed,
On 13/10/2023 10:31, Shengjiu Wang wrote:
> Implement the ASRC memory to memory function using
> the v4l2 framework, user can use this function with
> v4l2 ioctl interface.
>
> User send the output and capture buffer to driver and
> driver store the converted data to the capture buffer.
>
> This
On Mon, Oct 16, 2023 at 10:45:25AM -0400, Frank Li wrote:
> On Tue, Oct 10, 2023 at 06:02:36PM +0200, Lorenzo Pieralisi wrote:
> > On Tue, Oct 10, 2023 at 10:20:12AM -0400, Frank Li wrote:
> > > Ping
> >
> > Read and follow please (and then ping us):
> >
On Tue, Oct 10, 2023 at 06:02:36PM +0200, Lorenzo Pieralisi wrote:
> On Tue, Oct 10, 2023 at 10:20:12AM -0400, Frank Li wrote:
> > On Wed, Oct 04, 2023 at 10:23:51AM -0400, Frank Li wrote:
> > > On Fri, Sep 15, 2023 at 02:43:05PM -0400, Frank Li wrote:
> > > > ls1021a add suspend/resume support.
>
On Fri, Sep 15, 2023 at 02:43:04PM -0400, Frank Li wrote:
> Difference layerscape chip have not difference exit_from_l2() method.
> Using function pointer for ls1028. It prepare for other layerscape
> suspend/resume support.
>
How about:
Since difference SoCs require different sequence for
On Mon, Oct 16, 2023 at 12:11:04PM -0400, Frank Li wrote:
> On Mon, Oct 16, 2023 at 10:22:11AM -0500, Bjorn Helgaas wrote:
> > Obviously Lorenzo *could* edit all your subject lines on your behalf,
> > but it makes everybody's life easier if people look at the existing
> > code and follow the
On Mon, Oct 16, 2023 at 10:28:24PM +0530, Manivannan Sadhasivam wrote:
> On Fri, Sep 15, 2023 at 02:43:05PM -0400, Frank Li wrote:
> > ls1021a add suspend/resume support.
> >
>
> Please add what the driver is doing during suspend/resume.
>
> > Signed-off-by: Frank Li
> > ---
> >
On Fri, Sep 15, 2023 at 02:43:06PM -0400, Frank Li wrote:
> ls1043a add suspend/resume support.
>
Same comment as previous patch for patch description.
> Signed-off-by: Frank Li
> ---
> drivers/pci/controller/dwc/pci-layerscape.c | 91 -
> 1 file changed, 90 insertions(+),
Nathan Lynch writes:
> Haren Myneni writes:
>>> Haren Myneni writes:
The hypervisor returns migration failure if all VAS windows are not
closed. During pre-migration stage, vas_migration_handler() sets
migration_in_progress flag and closes all windows from the list.
The
On 10/16/23 1:30 PM, Nathan Lynch wrote:
Nathan Lynch writes:
Haren Myneni writes:
Haren Myneni writes:
The hypervisor returns migration failure if all VAS windows are not
closed. During pre-migration stage, vas_migration_handler() sets
migration_in_progress flag and closes all windows
On Fri, Sep 15, 2023 at 02:43:05PM -0400, Frank Li wrote:
> ls1021a add suspend/resume support.
>
Please add what the driver is doing during suspend/resume.
> Signed-off-by: Frank Li
> ---
> drivers/pci/controller/dwc/pci-layerscape.c | 88 -
> 1 file changed, 87
On Mon, Oct 16, 2023 at 12:11:04PM -0400, Frank Li wrote:
> On Mon, Oct 16, 2023 at 10:22:11AM -0500, Bjorn Helgaas wrote:
> > On Mon, Oct 16, 2023 at 10:45:25AM -0400, Frank Li wrote:
> > > On Tue, Oct 10, 2023 at 06:02:36PM +0200, Lorenzo Pieralisi wrote:
> > > > On Tue, Oct 10, 2023 at
On Mon, Oct 16, 2023 at 11:25:12AM -0500, Bjorn Helgaas wrote:
> On Mon, Oct 16, 2023 at 12:11:04PM -0400, Frank Li wrote:
> > On Mon, Oct 16, 2023 at 10:22:11AM -0500, Bjorn Helgaas wrote:
>
> > > Obviously Lorenzo *could* edit all your subject lines on your behalf,
> > > but it makes
*** Idea ***
For kexec -p, the boot cpu can be not the cpu0, this causes the problem
of allocating memory for paca_ptrs[]. However, in theory, there is no
requirement to assign cpu's logical id as its present sequence in the
device tree. But there is something like cpu_first_thread_sibling(),
In order to identify the boot cpu, its intserv[] should be recorded and
checked in smp_setup_cpu_maps().
smp_setup_cpu_maps() is shared between PPC64 and PPC32. Since PPC64 has
already used boot_cpu_hwid to carry that information, enabling this
variable on PPC32 so later it can also be used to
From: Pingfan Liu
Since my last v4 [1], the code has undergone great changes. The paca[]
array has been reorganized and indexed by paca_ptrs[], which
dramatically decreases the memory consumption even if there are many
unpresent cpus in the middle.
However, reordering the logical cpu numbers
On Mon, Oct 16, 2023 at 12:13:53PM +0530, Sourabh Jain wrote:
> Hello Pingfan,
>
> > > > > > With this patch series applied, the kdump kernel fails to boot on
> > > > > > powerpc with nr_cpus=1.
> > > > > >
> > > > > > Console logs:
> > > > > > ---
> > > > > > [root]# echo c >
Hello,
On Fri, Oct 13, 2023 at 12:31 AM Athira Rajeev
wrote:
>
> shellcheck was run on perf tool shell scripts as a pre-requisite
> to include a build option for shellcheck discussed here:
> https://www.spinics.net/lists/linux-perf-users/msg25553.html
>
> And fixes were added for the
Erhard Furtner writes:
> On Thu, 12 Oct 2023 22:41:56 +1100
> Michael Ellerman wrote:
>
>> Can you checkout the exact commit that crash is from and do:
>>
>> $ make arch/powerpc/mm/book3s64/hash_utils.lst
>>
>> And paste/attach the content of that file.
>>
>> cheers
>
> Ok, attached the
On Tue, 10 Oct 2023 13:32:37 -0700, Nathan Chancellor wrote:
> Clang warns (or errors with CONFIG_WERROR=y) several times along the
> lines of:
>
> drivers/scsi/ibmvscsi/ibmvfc.c:650:17: warning: implicit truncation from
> 'int' to a one-bit wide bit-field changes value from 1 to -1
>
Hello Pingfan,
With this patch series applied, the kdump kernel fails to boot on
powerpc with nr_cpus=1.
Console logs:
---
[root]# echo c > /proc/sysrq-trigger
[ 74.783235] sysrq: Trigger a crash
[ 74.783244] Kernel panic - not syncing: sysrq triggered crash
[ 74.783252]
On Sun, 2023-10-08 at 20:01:29 UTC, =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= wrote:
> The .remove() callback for a platform driver returns an int which makes
> many driver authors wrongly assume it's possible to do error handling by
> returning an error code. However the value returned is ignored (apart
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