diff options
| author | Russ Weight <russell.h.weight@intel.com> | 2022-04-21 14:22:00 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-26 12:34:28 +0200 |
| commit | 97730bbb242cde22b7140acd202ffd88823886c9 (patch) | |
| tree | b09e50663744488f3b91ed37a764837a06355bb2 /drivers/base/firmware_loader/Kconfig | |
| parent | e0c11a8b985137aebf4bcd07cd957b80ac23924d (diff) | |
| download | lwn-97730bbb242cde22b7140acd202ffd88823886c9.tar.gz lwn-97730bbb242cde22b7140acd202ffd88823886c9.zip | |
firmware_loader: Add firmware-upload support
Extend the firmware subsystem to support a persistent sysfs interface that
userspace may use to initiate a firmware update. For example, FPGA based
PCIe cards load firmware and FPGA images from local FLASH when the card
boots. The images in FLASH may be updated with new images provided by the
user at his/her convenience.
A device driver may call firmware_upload_register() to expose persistent
"loading" and "data" sysfs files. These files are used in the same way as
the fallback sysfs "loading" and "data" files. When 0 is written to
"loading" to complete the write of firmware data, the data is transferred
to the lower-level driver using pre-registered call-back functions. The
data transfer is done in the context of a kernel worker thread.
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Tianfei zhang <tianfei.zhang@intel.com>
Tested-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Link: https://lore.kernel.org/r/20220421212204.36052-5-russell.h.weight@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/firmware_loader/Kconfig')
| -rw-r--r-- | drivers/base/firmware_loader/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig index d13e4383ea0c..7e663dd972a7 100644 --- a/drivers/base/firmware_loader/Kconfig +++ b/drivers/base/firmware_loader/Kconfig @@ -202,5 +202,19 @@ config FW_CACHE If unsure, say Y. +config FW_UPLOAD + bool "Enable users to initiate firmware updates using sysfs" + select FW_LOADER_SYSFS + select FW_LOADER_PAGED_BUF + help + Enabling this option will allow device drivers to expose a persistent + sysfs interface that allows firmware updates to be initiated from + userspace. For example, FPGA based PCIe cards load firmware and FPGA + images from local FLASH when the card boots. The images in FLASH may + be updated with new images provided by the user. Enable this device + to support cards that rely on user-initiated updates for firmware files. + + If unsure, say N. + endif # FW_LOADER endmenu |