Good day,
I am currently working on a project where PCIe SSDs are constantly being swapped out and tested through benchmark programs such as VDBench and Iometer. The problem I face right now, which is only on the Linux side (got it working fine on windows), is that if the drives were not on at initial boot-up, they never appear under GParted or Disks. Here's what I have done:
Cold boot, PCIe Add-in-card SSD is off. It is then powered on through a pass through card that is logically controlled to make sure power and shorts are not an issue.
I turn the device on, then run:
sudo sh -c "echo 1 > /sys/bus/pci/rescan"
Performing a
lspci -tv
The device shows with no issues in the tree. When I check under Disks however, it is not there.
I have tried a bunch of different commands with none of them seeming to help me. I have tried
partprobe
Which did not do anything. and:
sudo sh -c "echo 1 > /sys/bus/pci/devices/0000:82:00.0/remove"
Followed up another rescan:
sudo sh -c "echo 1 > /sys/bus/pci/rescan"
As well as:
sudo sh -c "echo 1 > /sys/bus/pci/devices/0000:82:00.0/enable"
Still nothing. Also ran:
dmesg
Which shows, amongst other things:
[ 68.128778] pci 0000:82:00.0: [8086:0953] type 00 class 0x010802
[ 68.128797] pci 0000:82:00.0: reg 0x10: [mem 0x00000000-0x00003fff 64bit]
[ 68.128820] pci 0000:82:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
[ 68.133398] pci 0000:84:00.0: [1c58:0003] type 00 class 0x010802
..............................
[ 68.141751] nvme 0000:82:00.0: enabling device (0100 -> 0102)
..............................
I do see a lot of fails in dmesg for other addresses, such as:
[ 1264.718446] pcieport 0000:03:04.0: BAR 14: no space for [mem size 0x00400000]
[ 1264.718448] pcieport 0000:03:04.0: BAR 14: failed to assign [mem size 0x00400000]
[ 1264.718451] pcieport 0000:03:04.0: BAR 13: no space for [io size 0x1000]
[ 1264.718453] pcieport 0000:03:04.0: BAR 13: failed to assign [io size 0x1000]
Although I have a feeling that those are unrelated to what I am doing, although I'd be happy for someone to prove me wrong.
So, after all of these attempts, does anyone know if there is a way (or if it is even possible) to scan for this PCIe Add-in NVMe SSD and be able to use it without rebooting? I also took a look at some of the threads for other HDDs that reference a rescan for sata based drives, but this is NOT that, so referencing that won't help either.
Thanks in advance.
I ran into the same issue benchmarking nvme PCIE passthrough with QEMU / Proxmox.
First take note of the driver in use:
lspci -nnk -s '0000:82:00.0'
It should say
Kernel driver in use: vfio-pci
Now unbind the driver, then reprobe:
echo '0000:82:00.0' > /sys/bus/pci/drivers/vfio-pci/unbind
echo '0000:82:00.0' > /sys/bus/pci/drivers_probe
Check the driver again with:
lspci -nnk -s '0000:82:00.0'
Kernel driver in use: nvme
lsblk should now show the drive. Found the procedure here
I tried doing that to save time which is used by rebooting. The PCI device driver at that time was dodgy at best about successfully rescanning and getting all its ducks in a row. The device was an FPGA presenting a proprietary interface device for a device driver I was developing. That was with kernel 2.6.30-something tried around March 2014. My (substandard, but acceptable) solution was to reboot the system.
Related
I'm trying to communicate with a Di245 through its Virtual COM driver (VCD) in Linux (pdf) and I'm having a strange issue. Internally, an FTDI chipset is used by this device (FT232BL).
Attaching the device by itself isn't registered as a VCD, so I do the following:
sudo modprobe usbserial vendor=0x0683 product=0x2450
which results in the following dmesg message:
usbserial: USB Serial support registered for generic
usbserial_generic 3-3:1.0: The "generic" usb-serial driver is only for testing and one-off prototypes.
usbserial_generic 3-3:1.0: Tell linux-usb#vger.kernel.org to add your device to a proper driver.
usbserial_generic 3-3:1.0: generic converter detected
usb 3-3: generic converter now attached to ttyUSB0
and I get the /dev/ttyUSB0 device as promised. So far, everything seems ok.
However, if I open the port in my code, I get a bunch of 1` from it (alternating 1 and `). Trying with screen:
screen /dev/ttyUSB0 115200
I continuously receive 1`. This is definitely not something the device is sending and oddly enough, if I put a random baudrate, I keep getting the same thing.
Is this a way some error is being reported? What could be triggering this behavior and how can I address it?
The solution was the following:
# modprobe usbserial vendor=0x0683 product=0x2450
# modprobe ftdi_sio
# echo "0683 2450" >> /sys/bus/usb-serial/drivers/ftdi_sio/new_id
This way, the ftdi_sio driver knows which vendor/product to provide VCD for. The following udev rule (say, 99-di245.rules) can automate this:
ACTION=="add", ATTRS{idVendor}=="0683", ATTRS{idProduct}=="2450", RUN+="/sbin/modprobe ftdi_sio" RUN+="/sbin/modprobe usbserial vendor=0x0683 product=0x2450" RUN+="/bin/sh -c 'echo 0683 2450 > /sys/bus/usb-serial/drivers/ftdi_sio/new_id'"
It is installed with:
$ sudo cp 99-di245.rules /etc/udev/rules.d
$ sudo udevadm control --reload
Within a bash script, I use the following:
$ stty -F /dev/ttyUSB0 921600 raw
$ echo -n "some test data" >/dev/ttyUSB0
and it works as expected.
Using a PL2303 USB to RS232 adapter:
$ lsusb
...
Bus 006 Device 010: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 006 Device 011: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Now I tried to do the same with 1 MBd, but got an error:
$ stty -F /dev/ttyUSB0 1000000 raw
stty: /dev/ttyUSB0: unable to perform all requested operations
Also the same message when I try with 500 kBd. Trying 250 kBd the error message is different:
$ stty -F /dev/ttyUSB0 250000 raw
stty: invalid argument `250000'
Try `stty --help' for more information.
As seen here, it's a problem in the PL2303 linux driver.
I'm working on Kubuntu 12.04, 32 Bit. Unfortunally, I don't know how to fix that driver on my system (getting driver source, patch em, compile, install … hmm, maybe I learn a bit and give it a try - advice is welcome).
But maybe there is an updated driver avaliable which is easy to install?
Or does someone know an alternate USB to RS232 adapter which works at 1 MBd (hardware flowcontrol via rts/cts is needed, which works pretty well with the PL2303)?
After the realization that »Prolific and FTDI are competitors«, I bought Ftdi US232R-10 which is a FT232R based device and specified for 1 MBd transfer rate.
With this adapter I'd successfully tested communication at 1 MBd by transfering some GiB data without any error (including usage of Rts/Cts hardware flow control).
Configuring this device using stty like:
$ stty -F /dev/ttyUSB0 1000000 raw
works successfully.
Trying to solve this problem (ttyUSB0 that works properly than stop working after about 1hr)I'm thinking on if disconnecting and reconnecting the usb device could be a good fix.
So, it is possibile to cut down power to the USB device and repower it programmatically (bash)?
# lsusb -t
1-1:1.0: No such file or directory
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M
|__ Port 1: Dev 2, If 0, Class=vend., Driver=, 12M
|__ Port 1: Dev 2, If 1, Class=vend., Driver=cp210x, 12M
On am335x, kernel 3.2.0, ubuntu core armhf.
[ 1.784332] usb 1-1: cp210x converter now attached to ttyUSB0
At the moment I need a complete power cycle to have ttyUSB0 back.
This is the solution:
Find the identity of your usb device.
# tree /sys/bus/usb/drivers/cp210x/
/sys/bus/usb/drivers/cp210x/
|-- 1-1:1.1 -> ../../../../devices/platform/omap/musb-ti81xx/musb-hdrc.1/usb1/1-1/1-1:1.1
|-- bind
|-- module -> ../../../../module/cp210x
|-- remove_id
|-- uevent
-- unbind
So 1-1:1.1 is the identifier of my ttyUSB0(it can be discovered also via dmesg).
Then, disconnect the device (as root):
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/unbind
reconnect it
# echo -n "1-1:1.1" > /sys/bus/usb/drivers/cp210x/bind
At this point I had the same device but with a different name, it was now ttyUSB1 instead of ttyUSB0.
- To avoid this I added a new rule in /etc/udev/rules.d/ by creating a new file named 99-usb-serial.rules with this line:
SUBSYSTEM=="tty", ATTRS{idVendor}=="10c4", ATTRS{idProduct}=="ea70", ATTRS{serial}=="002DCFAF", SYMLINK+="sameName", MODE:="0666"
where idVendor, idProduct and serial must be the values of your device. This rule will create a new device called sameName linked to the ttyUSB* device normally generated from the OS.
As #Robert Harvey Said,
You first need to find our driver that will help you 'unplug and plug' the usb. Type: ls /sys/bus/usb/drivers which should print something like this: btusb ftdi_sio hub usb usbfs usbhid usbserial_generic uvcvideo. These, are all the drivers for each usb device. Now, lets say mine is ftdi_sio, which is a device i use to program my arduino (atmega328p chip). I am not sure how Your/other usb devices name themselves there. Like, i dont know which of these is my mouse.
Now, you can see the driver's commands using:
ls /sys/bus/usb/drivers/ftdi_sio/, which will print something like: 1-4:1.0 bind module uevent unbind, Where 1-4:1.0 is the device's characteristic code, and the bind and unbind command, which are the 'plug' and 'unplug' command respectively.
Now, if i want to unplug programatically the ftdi usb port, i will type:
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbind
and, to plug it again:
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
Now, we can combine all the commands together, with a ';':
echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/unbind ; echo -n "1-4:1.0" > /sys/bus/usb/drivers/ftdi_sio/bind
As the title says!
I can read info from the device with "dmesg" and see it when "lsusb" but how do I attach/install it as for example dev/ttyUSB2
One way is to change the VID and PID with FTDI software FT Prog (utility for programming the EEPROM of FTxxx devices). Change to 0403 and 6001, Linux will then recognise it as a generic FTDI.
If you don't want to modify the ftdi chips settings, you could just add the VID / PID to the list of ids recognized by the ftdi driver. To do this at run time (non permanent) do:
modprobe ftdi_sio
echo "1c40 0477" > /sys/bus/usb-serial/drivers/ftdi_sio/new_id
How to get the details of RAID configuration in Linux ?
mdadm -D /dev/mdxx will give you detail of raid configuration.
cat /proc/mdstat will give detail about raid algorithm,level and chunk size etc .
This is real if this RAID is sofware....
In case of RAID hardware, you could type this command :
lspci -vv | grep -i raid
01:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2208 [Thunderbolt] (rev 01)
Kernel driver in use: megaraid_sas
Kernel modules: megaraid_sas
If you're talking about a running array:
cat /proc/mdstat
If you're talking about the mdadm config file, it's usually in /etc or /etc/mdadm depending on the distribution you're running on. The following command should find it in any event:
find /etc -name '*mdadm*'
ETA: Also, I would strongly recommend that you carefully study the mdadm man page so that you are very familiar with that utility. Knowing that utility well will save your bacon at some point.
mdadm --detail /dev/md0
(or whatever /dev/mdXXX you are using)