On Sat, Mar 09, 2024 at 12:41:56AM -0500, Jesse T wrote: > I would like to add support for userspace SPI async IO. > Why hasn't it been added? Nobody proposed anything. > Is it not as simple as adding the async equivalent of SPI_IOC_MESSAGE > to ioctl, or is that not a valid way to accomplish this? There's the completion part of things - you need a way to know that at least some of the messages have actually been handled, especially on the read side where you're going to look at the data. You also have to worry about management of the storage used for everything. TBH with modern systems it's unclear if async offers useful benefits outside of an interrupt context - the cost of synchronisation between CPUs gets very expensive very quickly.
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