forked from Minki/linux
mainlining shenanigans
e4e050167f
import memory resources from underlying pci device, thus allowing
userspace applications to memory map those resources.
without this change, current implementation, does not populate the
memory maps and are not shown under the corresponding sysfs uio entry:
root@apalis-imx8:~# echo "ad00 0122" > \
/sys/bus/pci/drivers/uio_pci_generic/new_id
[ 55.736433] uio_pci_generic 0000:01:00.0: enabling device (0000 -> 0002)
root@apalis-imx8:~# ls -lsrt /sys/class/uio/uio0/
0 -rw-r--r-- 1 root root 4096 Apr 27 18:52 uevent
0 -r--r--r-- 1 root root 4096 Apr 27 18:52 version
0 -r--r--r-- 1 root root 4096 Apr 27 18:52 suppliers
0 lrwxrwxrwx 1 root root 0 Apr 27 18:52 subsystem
-> ../../../../../../../../../class/uio
0 drwxr-xr-x 2 root root 0 Apr 27 18:52 power
0 -r--r--r-- 1 root root 4096 Apr 27 18:52 name
0 -r--r--r-- 1 root root 4096 Apr 27 18:52 event
0 lrwxrwxrwx 1 root root 0 Apr 27 18:52 device
-> ../../../0000:01:00.0
0 -r--r--r-- 1 root root 4096 Apr 27 18:52 dev
0 -r--r--r-- 1 root root 4096 Apr 27 18:52 consumers
root@apalis-imx8:~#
with the proposed changed, have following instead:
root@apalis-imx8:~# ls -lsrt /sys/class/uio/uio0/
0 -rw-r--r-- 1 root root 4096 Apr 27 19:06 uevent
0 -r--r--r-- 1 root root 4096 Apr 27 19:06 version
0 -r--r--r-- 1 root root 4096 Apr 27 19:06 suppliers
0 lrwxrwxrwx 1 root root 0 Apr 27 19:06 subsystem
-> ../../../../../../../../../class/uio
0 drwxr-xr-x 2 root root 0 Apr 27 19:06 power
0 -r--r--r-- 1 root root 4096 Apr 27 19:06 name
0 drwxr-xr-x 4 root root 0 Apr 27 19:06 maps
0 -r--r--r-- 1 root root 4096 Apr 27 19:06 event
0 lrwxrwxrwx 1 root root 0 Apr 27 19:06 device
-> ../../../0000:01:00.0
0 -r--r--r-- 1 root root 4096 Apr 27 19:06 dev
0 -r--r--r-- 1 root root 4096 Apr 27 19:06 consumers
root@apalis-imx8:~#
root@apalis-imx8:~# ls -lsrt /sys/class/uio/uio0/maps/
0 drwxr-xr-x 2 root root 0 Apr 27 19:07 map1
0 drwxr-xr-x 2 root root 0 Apr 27 19:07 map0
root@apalis-imx8:~#
root@apalis-imx8:~# cat /sys/class/uio/uio0/maps/map1/addr
0x0000000062000000
root@apalis-imx8:~#
root@apalis-imx8:~# cat /sys/class/uio/uio0/maps/map1/size
0x0000000000200000
root@apalis-imx8:~#
tested on AltaData ARINC 429 MiniPCIE module on imx8qm-apalis-ixora-v1.2
Signed-off-by: Firas Ashkar <firas.ashkar@savoirfairelinux.com>
Link: https://lore.kernel.org/r/20210427201046.4005820-1-firas.ashkar@savoirfairelinux.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.