tree d2876eeee15f34802ffe1d20f5ff0a331ba08d48
parent 8f47d1a5e545f903cd049c42da31a3be36178447
author Dave Jiang <dave.jiang@intel.com> 1579650269 -0700
committer Vinod Koul <vkoul@kernel.org> 1579844925 +0530

dmaengine: idxd: add char driver to expose submission portal to userland

Create a char device region that will allow acquisition of user portals in
order to allow applications to submit DMA operations. A char device will be
created per work queue that gets exposed. The workqueue type "user"
is used to mark a work queue for user char device. For example if the
workqueue 0 of DSA device 0 is marked for char device, then a device node
of /dev/dsa/wq0.0 will be created.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/157965026985.73301.976523230037106742.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>