Hello,
On viewing PCI driver, I see that dma buffer are allocated even while
the dma engine is actually in the EP device.
Is there any sense in doing this ?
Thanks,
Ran
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Hello,
I don't find in uio_pci_generic.c any usage of DMA.
Is it that the driver does not use DMA in transactions between device and host ?
Regards,
Ran
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Hello,
In PCI documentation
https://www.mjmwired.net/kernel/Documentation/PCI/pci.txt
there is a lot of reference to "DMA".
Is it DMA on cpu side or device side ?
Best Regards,
Ran
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Hello,
I find in documentation mention of rapidIO:
https://www.kernel.org/doc/Documentation/rapidio/rapidio.txt
Yet, in source code it seems that only few devices are supported with rapidIO:
http://lxr.free-electrons.com/source/drivers/rapidio/
http://lxr.free-electrons.com/source/drivers/rapidio
Hello,
As I understand word length in spi, defines the cs active time.
It therefore seems that linux driver suits when dealing with simple spi
protocols which keeps word size constant.
How can we deal with spi protocols which use different spi size as part of
protocol.
for example cs need to be ac
Hello,
I am trying to correctly register interrupt in kernel for user interface:
irq handler
=
static irqreturn_t irq_handler(int irq, void *dev_id)
{
struct elbit_irq_dev *elbit_irq = &elbit_irq_devices[0];
printk("irq in\n");
<< clear interrupt in fpga here or after the c
Hello,
In case where we have large space (like in fpga), we thought of using
ioremap_nocache() giving the complete area space for simplicity.
But does it has any cost (performance, memory or other) , or is it
better to use just chunk of the required space ?
Thank you,
Ran
On Sun, Jan 15, 2017 at 12:54 PM, Greg KH wrote:
> On Sun, Jan 15, 2017 at 12:17:40PM +0200, Ran Shalit wrote:
>> Hello,
>>
>> I've seen some modules where it is tested if virtual address is 0, and
>> if yes, it is acted as if it is an error.
>> But can
Hello,
I've seen some modules where it is tested if virtual address is 0, and
if yes, it is acted as if it is an error.
But can't virtual address be zero too ?
For example, in the following module:
https://github.com/khilman/omap-test-dmatest/blob/master/main.c
it is checked the returned value of
Hello,
I read the DMA-API-HOWTO
https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt
Which mainly talks about dma mapping APIs.
But I don't understand what's the meaning of DMA direction in context
of mapping.
As I understand this documentation talks about mapping of dma buffers
- NOT about
On Sun, Dec 25, 2016 at 2:37 PM, Greg KH wrote:
> On Sat, Dec 24, 2016 at 05:47:19PM +0200, Ran Shalit wrote:
>>
>>
>> On Tue, Dec 20, 2016 at 12:26 PM, Greg KH wrote:
>>
>> On Tue, Dec 20, 2016 at 12:15:22PM +0200, Ran Shalit wrote:
>> > On Tue
On Sun, Dec 4, 2016 at 12:33 PM, Greg KH wrote:
> On Sat, Dec 03, 2016 at 07:18:50PM +0200, Ran Shalit wrote:
>>
>>
>> On Sat, Dec 3, 2016 at 3:15 PM, Greg KH wrote:
>>
>> On Sat, Dec 03, 2016 at 02:43:30PM +0200, Ran Shalit wrote:
>> > Hel
On Tue, Dec 20, 2016 at 12:26 PM, Greg KH wrote:
> On Tue, Dec 20, 2016 at 12:15:22PM +0200, Ran Shalit wrote:
> > On Tue, Dec 20, 2016 at 11:38 AM, Greg KH wrote:
> > > On Mon, Dec 19, 2016 at 06:08:47PM +0200, Ran Shalit wrote:
> > >> Hello,
> > >&g
On Tue, Dec 20, 2016 at 11:38 AM, Greg KH wrote:
> On Mon, Dec 19, 2016 at 06:08:47PM +0200, Ran Shalit wrote:
>> Hello,
>>
>> I want to use DMA from userspace.
>
> Why?
Hi Greg,
We want that a userspace layer (a library) will do some HW related issues.
We have a mem
Hello,
I am trying to understand if kernel thread are always higher priority
then user thread.
Say, a kernel thread (created with kthread_create with SCHED_FIFO and
given priority x), and user thread (created with pthread_create was
created with SCHED_FIFO and given priority y), and priority of p
Hello,
I want to use DMA from userspace.
I already use dma in kernel, and now I want can create a character
device which will be responsible for this.
The only problem is that I want to use the same memory which was
allocated in kernel with dma_alloc_coherent.
Is it correct to use mmap in order
Hello,
This is something I'm not too sure about, so I rather ask it here:
When the context return to userspace on calling poll, is it done in
interrupt context ?
...
ret = poll(fds, 2, TIMEOUT * 1000);
if (ret == -1) {
perror ("poll");
return 1;
}
if (!ret) {
return 0;
}
if (fds[0].revents & POLLI
On Wed, Dec 7, 2016 at 8:21 PM, Ran Shalit wrote:
> On Wed, Dec 7, 2016 at 7:26 PM, Ran Shalit wrote:
>> On Wed, Dec 7, 2016 at 6:58 PM, Joel Fernandes wrote:
>>> On Tue, Dec 6, 2016 at 11:02 PM, Greg KH wrote:
>>>> On Tue, Dec 06, 2016 at 09:12:24PM -0800, Joel
On Wed, Dec 7, 2016 at 7:26 PM, Ran Shalit wrote:
> On Wed, Dec 7, 2016 at 6:58 PM, Joel Fernandes wrote:
>> On Tue, Dec 6, 2016 at 11:02 PM, Greg KH wrote:
>>> On Tue, Dec 06, 2016 at 09:12:24PM -0800, Joel Fernandes wrote:
>>>> On Tue, Dec 6, 2016 at 11:42 AM, R
On Wed, Dec 7, 2016 at 6:58 PM, Joel Fernandes wrote:
> On Tue, Dec 6, 2016 at 11:02 PM, Greg KH wrote:
>> On Tue, Dec 06, 2016 at 09:12:24PM -0800, Joel Fernandes wrote:
>>> On Tue, Dec 6, 2016 at 11:42 AM, Ran Shalit wrote:
>>> > Hello,
>>> >
>>
On Wed, Dec 7, 2016 at 9:02 AM, Greg KH wrote:
> On Tue, Dec 06, 2016 at 09:12:24PM -0800, Joel Fernandes wrote:
>> On Tue, Dec 6, 2016 at 11:42 AM, Ran Shalit wrote:
>> > Hello,
>> >
>> > I have spi device which is registered using spi_register_board_in
Hello,
I have spi device which is registered using spi_register_board_info(),
and I would like to get a pointer to this device in some other kernel module.
Is there a simple way to get a pointer to pointer to a device , so
that we can use it from other module ? (something like i2c_get_adapter
for
On Mon, Dec 5, 2016 at 4:35 PM, Greg KH wrote:
> On Mon, Dec 05, 2016 at 04:24:05PM +0200, Ran Shalit wrote:
> > Hello,
> >
> > We need to support serial driver with real time requirements (towards
> specific
> > device with RT demands):
> > Every 5.3msec rece
Hello,
We need to support serial driver with real time requirements (towards
specific device with RT demands):
Every 5.3msec receive 100 bytes and 1.3msec afterwards send 100 bytes.
1. Does kernel support real-time of such hard requirements ?
2. Is it matter if we do the exact bytes send/receive
On Mon, Dec 5, 2016 at 10:24 AM, Umair Khan wrote:
> On Mon, Dec 5, 2016 at 12:56 PM, Ran Shalit wrote:
> > Hello,
> >
> > I am trying to turn off screen using sysfs entries,
> > but I'm having some difficulties with it:
> >
> > 1.
> > comm
Hello,
I am trying to turn off screen using sysfs entries,
but I'm having some difficulties with it:
1.
command:
echo 0 > /sys/devices/platform/s5p-dsim.0/ea8061/backlight/panel/brightness
result:
screen is dimmed - BUT not turned off
2.
command:
cat
/sys/devices/platform/s5p-dsim.0/ea8061/backl
On Sun, Dec 4, 2016 at 12:43 PM, Ran Shalit wrote:
>
>
> On Sun, Dec 4, 2016 at 12:33 PM, Greg KH wrote:
>
>> On Sat, Dec 03, 2016 at 07:18:50PM +0200, Ran Shalit wrote:
>> >
>> >
>> > On Sat, Dec 3, 2016 at 3:15 PM, Greg KH wrote:
>> >
On Sun, Dec 4, 2016 at 12:33 PM, Greg KH wrote:
> On Sat, Dec 03, 2016 at 07:18:50PM +0200, Ran Shalit wrote:
> >
> >
> > On Sat, Dec 3, 2016 at 3:15 PM, Greg KH wrote:
> >
> > On Sat, Dec 03, 2016 at 02:43:30PM +0200, Ran Shalit wrote:
> > > He
On Sat, Dec 3, 2016 at 8:58 PM, Daniel. wrote:
> Is xinput avaible? I know that it can be use to disable input devices,
> but IFAIK android use custom GUI, that is not X...
>
>
>
No, it's not available in Android.
> 2016-12-03 16:04 GMT-02:00 Ran Shalit :
> >
>
On Sat, Dec 3, 2016 at 7:59 PM, Ran Shalit wrote:
>
>
> On Sat, Dec 3, 2016 at 7:48 PM, Daniel. wrote:
>
>> Is blacklisting it an option??
>>
>>
> I think not, because blacklist is only for loaded modules, Right ?
> While in android Linux, seems that all mod
On Sat, Dec 3, 2016 at 7:48 PM, Daniel. wrote:
> Is blacklisting it an option??
>
>
I think not, because blacklist is only for loaded modules, Right ?
While in android Linux, seems that all modules are built inside kernel
image...
> Regards,
>
> 2016-12-03 15:18 GM
On Sat, Dec 3, 2016 at 3:15 PM, Greg KH wrote:
> On Sat, Dec 03, 2016 at 02:43:30PM +0200, Ran Shalit wrote:
> > Hello,
> >
> > Is there some way to disable input event device ?
> > Maybe a way to disable its irq usage ?
> >
> > I actually rather do that f
Hello,
Is there some way to disable input event device ?
Maybe a way to disable its irq usage ?
I actually rather do that from shell, not from kernel, because the kernel
source is not available, and I thought that issue is also relevant in the
forum.
Thank you,
Ranchu
___
On Thu, Sep 15, 2016 at 11:50 PM, wrote:
> On Thu, 15 Sep 2016 23:19:51 +0300, Ran Shalit said:
>
>> Isn't writing to console, the same as outputing chars to serial ?
>
> No. For instance, consider any laptop where "console" is an LCD screen,
> and if it&#
Hello,
I am writing a driver with serial tx/rx.
I am not sure what is the need console routines, when there is
serial/uart tx/rx.
Isn't writing to console, the same as outputing chars to serial ?
I've tried to find information on this, but found none.
Thank you,
Ran
___
Hello,
There is something I don't understand about dma,
when doing memory to memory dma, it requires to cllocate dma buffer
(for example with dma_alloc_coherent),
than for each transfer we need to copy the buffer to the allocated
memory and than trigger dma transaction.
So, if it requires addition
Hello,
I have fpga connected to cpu.
In fpga we implement fifo which the cpu need to write into or read from.
The fpga is used for mac implementation.
So we actually need to copy to/from ip stack buffer to the fifo buffers in fpga.
As far as I understand this is memory-to-memory dma.
But I am not
Hello,
I am not sure I understand the difference between dma mam<>mem to mem<>device.
I am writing ethernet driver which use dma between ipstack buffer to
fpga buffer (the fpga implements in hw the the ethernet mac).
When moving buffers from one address (ipstack) to another (fpga) isn;t
it just m
Hello,
Is it possible to display in some way the current content of frame buffer ?
I have some issue that on rendering to /dev/fb2 with one application
(psplash), it goes to the correct output, but using another
application (qt) it always goes to /dev/fb2 (even if I static link
/dev/fb0 to /dev/fb
Hello,
I am writing ethernet network driver.
I would like to ask if there are any steps which can help when
debugging ethernet driver, or is it that the first test should already
involve transmit/recieve packets to/from ip stack ?
Any tips for debugging and testing a new ethernet driver will be a
On Fri, Jul 29, 2016 at 10:03 PM, Greg KH wrote:
> On Fri, Jul 29, 2016 at 09:47:40PM +0300, Ran Shalit wrote:
>> Hello,
>>
>> Can we write Ethernet driver without using dma ?
>
> Sure, we have USB network drivers that don't use DMA.
>
>> But still usi
Hello,
Can we write Ethernet driver without using dma ?
But still using sk_buff APIs like done in most drivers ?
Thanks,
Ran
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Hello,
I write ethernet driver (mac controller is implemented in fpga connected to cpu)
I see that the probe is not called on doing insmod.
Is there a way to force the probe to be called on doing insmod ?
I could not find in the board file (omap dart, kernel 3.4.0) any
reference to ethernet.
Hello,
I write a network driver, and I try to understand how to communicate with phy.
I see several methods, but did not found documentation on the
differences, and when to use each of these methods:
1. using generic phy -
a. I think we use it when we don't know the exaxt phy (?), though
I'm no
On Wed, Mar 9, 2016 at 11:16 AM, Ran Shalit wrote:
> Hello,
>
> I have some sample code which uses 2 test application:
> 1. test application in kernel , which allocates buffer using kmalloc
> (GFP_KERNEL)
> 2. test application in userspace which allocates buffer using malloc
j
Hello,
I have some sample code which uses 2 test application:
1. test application in kernel , which allocates buffer using kmalloc
(GFP_KERNEL)
2. test application in userspace which allocates buffer using malloc
In both cases the buffers are DMA through PCI.
I don't understand how is it that the
Hello,
I would like to monitor the write access to disk blocks (so that I can
monitor the block index in some bitmap)
I think this must be done in kernel (userspace have no such information)
I have tried to search in kernel but did not found where is the API to
access disk blocks.
There is libata-
On Wed, Feb 24, 2016 at 10:17 AM, wrote:
> On Wed, 24 Feb 2016 09:36:54 +0200, Ran Shalit said:
>
>> I am trying to write to rsyslog from application.
>> With openlog(..., LOG_USER), it works fine and I find the log in
>> /var/log/user.log (it is defines in /etc/rs
Hello,
I am trying to write to rsyslog from application.
With openlog(..., LOG_USER), it works fine and I find the log in
/var/log/user.log (it is defines in /etc/rsyslog.d/50-defaults.conf )
But we need to enable different applications to have each its own log file.
I tried to use LOG_LOCAL0 inst
On Mon, Feb 8, 2016 at 6:01 AM, Vishwas Srivastava
wrote:
> Hi Ran,
> the api which you have mentioned...
>
> void *
> dma_alloc_coherent(struct device *dev, size_t size,
> dma_addr_t *dma_handle, gfp_t flag)
>
> is the kernel api to alloc consistent memory.
>
> DMA devices unders
On Fri, Feb 5, 2016 at 11:15 AM, Denis Kirjanov wrote:
> On 2/5/16, Ran Shalit wrote:
>> Hello,
>>
>> I read the readme about dma API, but still don't understand how it
>> should be used
>> It is said that dma_alloc_coherent is responsible for allocatin
Hello,
I read the readme about dma API, but still don't understand how it
should be used
It is said that dma_alloc_coherent is responsible for allocating the buffer.
1. But how to trigger the dma transaction to start ?
2. Is there a callback when it is finished ?
Thank you,
Ran
On Sat, Dec 5, 2015 at 8:03 AM, Ran Shalit wrote:
> Hello,
>
> I would like to ask what is the effect of wiping frame buffer (dd
> if=/dev/zero of=/dev/fb0) ?
> I have some issue with framebuffer timing on LCD 240x320.
> I could not find a timing with width=240, height=3
Hello,
I would like to ask what is the effect of wiping frame buffer (dd
if=/dev/zero of=/dev/fb0) ?
I have some issue with framebuffer timing on LCD 240x320.
I could not find a timing with width=240, height=320 which result in
stable picture, but
the following timing gave me stable ppicture with
Hello,
I've successfuly managed to work with kgdb on linux: 3.14.25
But it seems that I must close the serial connection (which uses also for stdout
print), in order for the kgdb to manage its communication ?
I can use telnet instead, but still I thought that kgdb can handle
both the kgdb connecti
Hello,
I need to implement mmap for non-volatile memory chip (NVRAM).
I already did something simple, but now I understand that it is not complete:
The nvram need to be unlock and locked after finishing the memory task
of read/write.
Does mmap can handle such post/pre actions or not ( I guess tha
Hello,
I try to understand the cpuidle main concept but have some
difficulties. I could not find any documentation to explain the
cpuidle.
what does it mean that it enters idle when "no thread to run" ?if I
have only one process which does only
while(1)
{
printf("C");
mdelay(1000);
}
Can I expec
Hello,
Does anybody know what is the minimum expected time for sleep period
with the cpuidle ?
I intend t use the menu governer, and I try to estimate the sleep time.
Thanks,
Ran
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Hello,
What should be the approximate rate of entering and exit retention
mode in cpuide ?
Thanks
Ran
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On Sun, Sep 14, 2014 at 7:45 PM, Peter Teoh wrote:
>
>
> On Sat, Sep 13, 2014 at 3:50 PM, Ran Shalit wrote:
>>
>> On Sat, Sep 13, 2014 at 4:14 AM, Peter Teoh
>> wrote:
>> > please elaborate your requirements. char dev is for I/O to hardware.
>> > b
On Thu, Sep 11, 2014 at 12:24 PM, Ran Shalit wrote:
> On Thu, Sep 11, 2014 at 8:32 AM, AYAN KUMAR HALDER
> wrote:
>> On Thu, Sep 11, 2014 at 12:55 AM, wrote:
>>> On Wed, 10 Sep 2014 21:58:48 +0300, Ran Shalit said:
>>>
>>>> 1. How can I make a proces
On Sat, Sep 13, 2014 at 4:14 AM, Peter Teoh wrote:
> please elaborate your requirements. char dev is for I/O to hardware. but
> runtime PM is for hibernating machine. what is the connection u trying to
> achieve?
>
> On Mon, Sep 8, 2014 at 1:22 PM, Ran Shalit wrote:
>&g
On Thu, Sep 11, 2014 at 8:32 AM, AYAN KUMAR HALDER wrote:
> On Thu, Sep 11, 2014 at 12:55 AM, wrote:
>> On Wed, 10 Sep 2014 21:58:48 +0300, Ran Shalit said:
>>
>>> 1. How can I make a process to notice this inactivity ? Do you think
>>> it can be implemented b
On Wed, Sep 10, 2014 at 10:25 PM, wrote:
> On Wed, 10 Sep 2014 21:58:48 +0300, Ran Shalit said:
>
>> 1. How can I make a process to notice this inactivity ? Do you think
>> it can be implemented by some periodic process who check if there is
>> activity ? It returns to
On Wed, Sep 10, 2014 at 9:39 PM, wrote:
> On Wed, 10 Sep 2014 21:23:28 +0300, Ran Shalit said:
>
>> As far as I understand, suspend/respond PM is not per device, but for
>> all system,
>> and wakeup source will resume again the whole system.
>> I think you mean
On Wed, Sep 10, 2014 at 8:59 PM, wrote:
> On Wed, 10 Sep 2014 20:26:48 +0300, Ran Shalit said:
>
>> What is usually the criterion for PM (power management) suspending
>> that application shall use ? Is it according to minimum threshold for
>> cpu load (as indication fo
Hello,
What is usually the criterion for PM (power management) suspending
that application shall use ? Is it according to minimum threshold for
cpu load (as indication for no process) ?
How usually it is performed, i.e. is it some periodic process, which
wakes up periodically to check criterion
On Tue, Sep 9, 2014 at 8:48 PM, AYAN KUMAR HALDER wrote:
>> Is the wakeup source relevant only for suspend/resume , or also for
>> runtime PM ? for example, is the keybaord example , which you linked,
>> relevant for runtime PM too ?
> Refer to my reply in the other thread.
>
>> If yes - is the ke
On Tue, Sep 9, 2014 at 8:44 PM, AYAN KUMAR HALDER wrote:
>> Now, the thing I don't yet understand is what the wakeup source means
>> in this configuration. Wakeup only for a specific device driver ?
> Wakeup source has its relevance mostly for system suspend/resume where in
> a device (eg keyboard
On Mon, Sep 8, 2014 at 9:43 PM, AYAN KUMAR HALDER wrote:
>>
>> How should a wakeup source for a device be configured in code.
>> I could not find it documented anywhere.
>>
> Check out drivers/input/keyboard/samsung-keypad.c. It is configured as
> a wakeup source:-
> 1. device_init_wakeup() - conf
On Mon, Sep 8, 2014 at 9:57 PM, AYAN KUMAR HALDER wrote:
>> Hi,
>> Do you mean runtime suspend/resume ?
> No, I am talking about system suspend/resume (suspend to RAM, etc).
>
>> Why will the mouse wake the cpu
> Because it has been configured as a wakeup device.
>
>> from idle (cpuidle) ? Isn't i
On Mon, Sep 8, 2014 at 9:16 PM, AYAN KUMAR HALDER wrote:
>> When a device wakes up, what about the cpu , is it still on idle with
>> cpuidle ?
>> for example how a mouse move trigger the screen to wake up ?
>>
> This is a case of system suspend/resume. Your mouse is a wake-up device. It is
> conf
Hello,
Is there any character device example using runtime PM available ?
It is most helpful,
Thanks,
Ran
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On Sun, Sep 7, 2014 at 11:36 PM, AYAN KUMAR HALDER wrote:
> On Mon, Sep 8, 2014 at 1:50 AM, Ran Shalit wrote:
>>
>>
>> On Sun, Sep 7, 2014 at 11:14 PM, AYAN KUMAR HALDER
>> wrote:
>>> On Sat, Sep 6, 2014 at 9:56 PM, Ran Shalit wrote:
>>>> Hello
&
On Sun, Sep 7, 2014 at 11:14 PM, AYAN KUMAR HALDER
wrote:
> On Sat, Sep 6, 2014 at 9:56 PM, Ran Shalit wrote:
>> Hello
>>
>> What does it mean device without wakeup source in terms of runtime PM ?
>>
> Can you give some source/reference where you came across this
Hello
What does it mean device without wakeup source in terms of runtime PM ?
Thanks,
Ran
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Hi,
Thanks very much for the detailed answer. If I may ask one more on
this issue please...
I am required to put some external device (led brightness) into
minimal brightness when the system gets to idle.
The control on led brightness value is done as part of dedicated
character device which was
Hi Ayan,
When adding some external device to power management, doesn't it need
to belong to power domain ( /debug/pm_debug/count ).
What is the power domain of external device ?
Thanks
Ran
On Wed, Sep 3, 2014 at 11:23 PM, Ran Shalit wrote:
> Hi Ayan,
> Thanks very much for the e
Hi Ayan,
Thanks very much for the explanations, it makes things a bit more
clearer than before, but I still have some question marks.
"System moving to idle state would correspond to most devices in a
runtime-pm idle state. Each device enter into idle state when its
corresponding driver invokes s
On Fri, Jul 6, 2012 at 8:36 PM, Mulyadi Santosa
wrote:
> Hi...
>
> On Fri, Jul 6, 2012 at 9:05 PM, Ran Shalit wrote:
>> Hello,
>>
>> Is it legal to change ip address & mac address when working with NFS,
>> and after linux finished startup ?
>> It seems
Hello,
Is it legal to change ip address & mac address when working with NFS,
and after linux finished startup ?
It seems that in such case, NFS can get stuck, right?
Thank you, Ran
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Hello,
I would like to ask your advise concerning modifying ip address:
I need to modify ip address and ethernet address according to some
hardware input in application. This change can be done in u-boot or
linux.
When I consider where is the best place to set the ip/mac address (
u-boot or linux)
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