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4 Commits

Author SHA1 Message Date
Dave Jiang
0705107fcc dmaengine: idxd: move submission to sbitmap_queue 
Kill the percpu-rwsem for work submission in favor of an sbitmap_queue.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/159225446631.68253.8860709181621260997.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2020-06-24 12:55:09 +05:30
Dave Jiang
42d279f913 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>
 2020-01-24 11:18:45 +05:30
Dave Jiang
8f47d1a5e5 dmaengine: idxd: connect idxd to dmaengine subsystem 
Add plumbing for dmaengine subsystem connection. The driver register a DMA
device per DSA device. The channels are dynamically registered when a
workqueue is configured to be "kernel:dmanegine" type.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/157965026376.73301.13867988830650740445.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2020-01-24 11:18:45 +05:30
Dave Jiang
d1dfe5b8ac dmaengine: idxd: add descriptor manipulation routines 
This commit adds helper functions for DSA descriptor allocation,
submission, and free operations.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/157965025757.73301.12692876585357550065.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2020-01-24 11:18:45 +05:30