7820a55...
by
Korneliusz Osmenda <email address hidden>
UBUNTU: SAUCE: Guard pci_create_sysfs_dev_files with atomic value
On Gateworks Ventana there is a number of PCI devices and:
- imx6_pcie_probe takes longer than start of late init
- pci_sysfs_init sets up flag sysfs_initialized
- pci_sysfs_init initializes already found devices
- imx6_pcie_probe tries to reinitialize device
Adds support for t7xx wwan device firmware flashing & coredump collection
using devlink.
1> Driver Registers with Devlink framework.
2> Implements devlink ops flash_update callback that programs modem fw.
3> Creates region & snapshot required for device coredump log collection.
On early detection of wwan device in fastboot mode driver sets up CLDMA0 HW
tx/rx queues for raw data transfer and then registers to devlink framework.
On user space application issuing command for firmware update the driver
sends fastboot flash command & firmware to program NAND.
In flashing procedure the fastboot command & response are exchanged between
driver and device. Once firmware flashing is success completion status is
reported to user space application.
Below is the devlink command usage for firmware flashing
$devlink dev flash pci/$BDF file ABC.img component ABC
Note: ABC.img is the firmware to be programmed to "ABC" partition.
In case of coredump collection when wwan device encounters an exception
it reboots & stays in fastboot mode for coredump collection by host driver.
On detecting exception state driver collects the core dump, creates the
devlink region & reports an event to user space application for dump
collection. The user space application invokes devlink region read command
for dump collection.
Below are the devlink commands used for coredump collection.
devlink region new pci/$BDF/mr_dump
devlink region read pci/$BDF/mr_dump snapshot $ID address $ADD length $LEN
devlink region del pci/$BDF/mr_dump snapshot $ID
