dmaengine: idxd: set descriptor allocation size to threshold for swq

mainline inclusion
from mainline-v5.15
commit 9806eb5c
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I596WO


CVE: NA

Intel-SIG: commit 9806eb5c dmaengine: idxd: set descriptor allocation size to threshold for swq.
Incremental backporting patches for DSA/IAA on Intel Xeon platform.

--------------------------------

Since submission is sent to limited portal, the actual wq size for shared
wq is set by the threshold rather than the wq size. When the wq type is
shared, set the allocated descriptors to the threshold.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162827151733.3459223.3829837172226042408.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>