Messages in this thread | | | Date | Fri, 10 Mar 2017 09:11:54 -0800 (PST) | From | matthew.gerlach@linux ... | Subject | Re: [RFC 0/2] Add streaming API for firmware and FPGA manager |
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On Thu, 9 Mar 2017, yi1.li@linux.intel.com wrote:
> From: Yi Li <yi1.li@linux.intel.com>
Hi Yi,
This functionality is extremely helpful. I am working with a firmware image of about 90 MBs, and even using scatter-gather instead of a continguous piece of memory is a lot of memory.
Matthew Gerlach
> > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-fpga" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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