On Tue, Dec 9, 2014 at 8:42 PM, Lucas Tanure <tanure@xxxxxxxxx> wrote: > On Tue, Dec 9, 2014 at 7:19 PM, Saket Sinha <saket.sinha89@xxxxxxxxx> wrote: >> Hi Lucas, >> >> Please find my response inline. >> >>> Goal: find drivers that I could start improving ( understand, develop, >>> test , submit ) >>> How : If my machine uses a driver, I can read the code, modify and >>> test in my machine >>> >> >> Suppose you want to improve/change a basic driver you are using for >> example XFS filesystem. >> >> /lib/modules/<kernel_version>/points to the location of the source code >> >> On my Ubuntu 14.04 machine, >> >> ssinha@ssinha-Latitude-E6440:~$ ls -l /lib/modules/`uname -r`/ >> total 3852 >> lrwxrwxrwx 1 root root 40 Sep 23 04:03 build -> >> /usr/src/linux-headers-3.13.0-37-generic >> >> >> so the location of the source code is /usr/src/linux-headers-3.13.0-37-generic. >> >> Now go to the fs folder here to get the source code of xfs. >> ssinha@ssinha-Latitude-E6440:~$ ls -l >> /usr/src/linux-headers-3.13.0-37-generic/fs/xfs >> total 8 >> -rw-r--r-- 1 root root 3839 Jan 20 2014 Kconfig >> -rw-r--r-- 1 root root 3027 Jan 20 2014 Makefile >> >> Now what I find is that I have only headers not the entire source code. >> >> So the distros don't generally ship with the entire source code. You >> can get the source code of your running kernel by either the source >> packages(kernel-src-rpms or kernel-src-deb) of the distros or you can >> get tar ball of your running kernel from the kernel.org. >> >>> So, if I'm able to see where is located the source for a driver that >>> my machine uses, I can modify and test. >>> >> >> Now when you have the source code, change the driver, make sure its >> enabled in the kernel .config driver, build the entire kernel and boot >> into your modified kernel. (If your driver is standalone and not >> dependent on other drivers, you can build its seprately and insmod it >> without having to build the entire kernel tree.) >> >> Hope that helps. >> >> Regards, >> Saket Sinha >> >> >> On Wed, Dec 10, 2014 at 2:23 AM, Davide Gianforte <davide@xxxxxxxxxxxxxx> wrote: >>> In data martedì 9/12/2014 18:45:59, Lucas Tanure ha scritto: >>>> Hi, >>>> >>>> How do I list where are the modules that I'm using inside kernel ? >>>> >>>> Goal: find drivers that I could start improving ( understand, develop, >>>> test , submit ) >>>> How : If my machine uses a driver, I can read the code, modify and >>>> test in my machine >>>> >>>> So, if I'm able to see where is located the source for a driver that >>>> my machine uses, I can modify and test. >>>> >>>> Ideas ? >>>> >>>> Thanks >>> >>> 'lsmod' and 'lspci -k' show your loaded modules and which module is handling a device. >>> >>> 'find /lib/modules/$(uname -r)/kernel $module_name' show you where the module is located; /lib/modules/<kernel_version>/kernel folder tree is equal to the source tree. >>> >>> Dave >>> >>> _______________________________________________ >>> Kernelnewbies mailing list >>> Kernelnewbies@xxxxxxxxxxxxxxxxx >>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > Hi, > > Thanks for the reply. But, actually, I found one solution, just like > what Davide explained. > > tanure@archDesk ~ $ modinfo ehci_hcd > filename: > /lib/modules/3.18.0-next-20141209-ARCH/kernel/drivers/usb/host/ehci-hcd.ko > license: GPL > author: David Brownell > description: USB 2.0 'Enhanced' Host Controller (EHCI) Driver > depends: usbcore > intree: Y > vermagic: 3.18.0-next-20141209-ARCH SMP preempt mod_unload modversions > parm: log2_irq_thresh:log2 IRQ latency, 1-64 microframes (int) > parm: park:park setting; 1-3 back-to-back async packets (uint) > parm: ignore_oc:ignore bogus hardware overcurrent indications (bool) > > With modinfo I can locate the path "drivers/usb/host/ehci-hcd.ko" and > this is my /workspace/linux-next/drivers/usb/host/ehci*. > This is similar what you guys talked. > > Many thanks guys > > -- > Lucas Tanure > +55 (19) 988176559 Hi, This command: $ lsmod | grep -Eo '^[^ ]+' | sed 1d | xargs modinfo | grep filename Shows me where is the code that I'm using. So, I can start with these source codes. Thanks -- Lucas Tanure +55 (19) 988176559 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
