Hi, >> >> >> This patch adds support for APM X-Gene SoC Queue Manager/Traffic Manager. >> >> >> QMTM is required by APM X-Gene SoC Ethernet, PktDMA (XOR Engine) and >> >> >> Security Engine subsystems. All subsystems communicate with QMTM using >> >> >> messages which include information about the work to be performed and >> >> >> the location of associated data buffers. >> >> > >> >> > Please describe here what the purpose of the qmtm is, as this is not >> >> > entirely clear from the code. >> >> > >> >> > In particular, please describe how this differs from a dmaengine driver >> >> > and why it is not possible to extend the dma slave API to describe qmtm >> >> > as a dma engine. >> >> > >> >> [Loc Ho] >> >> If the QM driver implements the DMA API, what about the actual DMA >> >> engine driver which interfaces with this QM driver. We would have DMA >> >> client interfaces with the X-Gene DMA driver (not available yet) via >> >> DMA API which in turn interfaces with this QM driver via DMA API. >> >> Won't this be kind of awkward? Also, the QM only manage messages (or >> >> descriptors) which are 32-bytes or 64-bytes. It doesn't actually do >> >> any data transfer of various sizes. >> > >> > Please describe here what the purpose of the qmtm is, as this is not >> > entirely clear from the code or from your reply. >> > >> > Greg was guessing that it's a bus controller, my best guess is a DMA >> > engine. If it's something completely different, you have to let >> > us know what it is so we can do a proper review rather than guessing. >> > >> > Please provide a link to the data sheet if you are unable to explain. >> >> Here is URL to a text document explaining role of QMTM device with CPU, Ethernet >> subsystem. >> >> https://drive.google.com/file/d/0B28TgQZ3JLoRRGNnbjJoUGNHWW8/edit?usp=sharing > > There is nothing at this link :( I tried click on the txt file link from web site http://www.spinics.net/lists/netdev/msg264628.html and don't see any problem with accessing the txt file. -Loc -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
