dmaengine: idxd: add per DSA wq workqueue for processing cr faults

[ Upstream commit 2f30decd ]

Add a workqueue for user submitted completion record fault processing.
The workqueue creation and destruction lifetime will be tied to the user
sub-driver since it will only be used when the wq is a user type.

Tested-by: Tony Zhu <tony.zhu@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20230407203143.2189681-7-fenghua.yu@intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>
Stable-dep-of: 8dfa57aa ("dmaengine: idxd: Fix allowing write() from different address spaces")
Signed-off-by: Sasha Levin <sashal@kernel.org>