On Tue, 8 Sep 2015 12:46:08 -0400 "Kevin O'Connor" <ke...@koconnor.net> wrote:
> On Mon, Sep 07, 2015 at 01:08:29PM +0200, Gerd Hoffmann wrote: > > > It's just simplicity. If you want to read a few times from the > > > same field (like in ACPI tables, read the data size and then the > > > data), you need a way to enable and disable the selector and > > > manage the current offset for that entry. This is already > > > provided with the "old" interface. > > > > Could be handled with a 'select' control bit. Only when set select > > entry and reset offset to zero. > > I think two features would help "round off" the new fw_cfg DMA > proposal: add a select bit as you describe (that uses the 16 most > significant bits of the "control" field for the "select entry" when > the bit is set), and define a static signature (eg, "QEMU CFG") when > reading the 64bit MMIO dma register. > > Both are optional features that don't change the fundamental > interface; I was thinking of sending them as two patches on top of > Marc's next version of his patch series (if no one else gets to it > first). > As there will be (at least) another version, I can add those simple changes in the next version. Thanks Marc -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
