Hello, as a part of my work related usually to FPGAs, I was playing with the uio_dmem_genirq. First, I've discovered a (possible) bug in the uio_dmem_genirq in exposing the dynamic regions to userspace (patch 0001). When specifying a number of dynamic regions, one mapping is (due to counting IORESOURCE_IRQ) skipped: .../maps/map0/addr: 0xe000b000 <<< IORESOURCE_MEM from reg = <...> .../maps/map0/size: 0x00001000 .../maps/map1/addr: 0xffffffff <<< no mapping (skipped due to IORESOURCE_IRQ) .../maps/map1/size: 0x00008000 .../maps/map2/addr: 0x1e210000 <<< the first dynamic mapping .../maps/map2/size: 0x00008000 .../maps/map3/addr: 0x1e218000 .../maps/map3/size: 0x00008000 .../maps/map4/addr: 0x1e220000 .../maps/map4/size: 0x00008000 Next, I needed to do some DMA from userspace and I didn't like to change the kernel at all. The uio_pdrv_genirq has a feature to specify of_id when calling insmod to bind to a specific device. I've implemented this (patches 0002-0004) for uio_dmem_genirq and added two OF properties to specify memory allocations. The work is inspired by those commits (but reworked): * https://github.com/analogdevicesinc/linux/commit/757e2c54a613abed6145fcd572cf6c5d8b3fb7fc * https://github.com/analogdevicesinc/linux/commit/45ec4148b290302c7de8e6a1de0d9f7b2833339b Regards Jan Jan Viktorin (4): uio: fix dmem_region_start computation uio: UIO_IRQ_NONE is a valid option for uioinfo->irq uio: introduce devicetree bindings for uio_dmem_genirq uio: allow binding uio_pdrv_genirq.c to devices using command line option .../devicetree/bindings/uio/uio_dmem_genirq.txt | 16 ++++ drivers/uio/uio_dmem_genirq.c | 93 +++++++++++++++------- 2 files changed, 81 insertions(+), 28 deletions(-) create mode 100644 Documentation/devicetree/bindings/uio/uio_dmem_genirq.txt -- 2.8.0 -- 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
