linux-kernel - [RFC 0/2] Add streaming API for firmware and FPGA manager

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Date:   Thu,  9 Mar 2017 18:18:08 -0600
From:   yi1.li@...ux.intel.com
To:     ming.lei@...onical.com, mcgrof@...nel.org,
        gregkh@...uxfoundation.org, atull@...nsource.altera.com,
        moritz.fischer@...us.com, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Cc:     Yi Li <yi1.li@...ux.intel.com>
Subject: [RFC 0/2] Add streaming API for firmware and FPGA manager 

From: Yi Li <yi1.li@...ux.intel.com>

As the FPGA hardware advances, the firmware image size grows (hundres
of MBs or more). It could be an issue for kernel to allocate a big
buffer to load the whole firmware file.
Here is an attempt to read the firmware file into a small buffer and
program the FPGA in a loop (or so call the streaming mode). It should not
be a performance hit for FPGA programing since the majority of time
spend is with the FPGA CvP/PR-IP interface. 

pseudo code in fpga manager:
while (size > 0) {
	ret = stream_firmware(&fw, image_name, dev, offset, streamsize);
	ret = mgr->mops->write(mgr, fw->data, fw->size);
	offset += fw->size;
	size -= fw->size;
}

Thanks,
Yi

Yi Li (2):
  firmware class: Add stream_firmware API.
  fpga manager: Add fpga_mgr_firmware_stream API

 drivers/base/firmware_class.c | 128 ++++++++++++++++++++++++++++++++++++++++++
 drivers/fpga/fpga-mgr.c       |  77 +++++++++++++++++++++++++
 include/linux/firmware.h      |   2 +
 include/linux/fpga/fpga-mgr.h |   4 ++
 4 files changed, 211 insertions(+)

-- 
2.7.4