kernel/drivers/s390/block/scm_blk.h, branch linux-4.3.y

s390/scm_block: make the number of reqs per HW req configurable

2014-12-08T08:42:47Z

Introduce a module parameter to specify the number of requests we try to handle with one HW request. Suggested-by: Peter Oberparleiter Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky

s390/scm_block: handle multiple requests in one HW request

2014-12-08T08:42:46Z

Handle up to 8 block layer requests per HW request. These requests can be processed in parallel on the device leading to better throughput (and less interrupts). The overhead for additional requests is small since we don't blindly allocate new aidaws but try to use what's left of the previous one. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky

s390/scm_block: allocate aidaw pages only when necessary

2014-12-08T08:42:44Z

AOBs (the structure describing the HW request) need to be 4K aligned but very little of that page is actually used. With this patch we place aidaws at the end of the AOB page and only allocate a separate page for aidaws when we have to (lists of aidaws must not cross page boundaries). Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky

s390/scm_block: use mempool to manage aidaw requests

2014-12-08T08:42:43Z

We currently use one preallocated page per HW request to store aidaws. With this patch we use mempool to allocate an aidaw page whenever we need it. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky

s390/s390dbf: use debug_level_enabled() where applicable

2013-10-24T15:16:54Z

Refactor direct debug level comparisons with the (internal) s390db->level member. Use the debug_level_enabled() function instead. Signed-off-by: Hendrik Brueckner Signed-off-by: Martin Schwidefsky

s390/scm_blk: suspend writes

2013-03-07T08:52:23Z

Stop writing to scm after certain error conditions such as a concurrent firmware upgrade. Resume to normal state once scm_blk_set_available is called (due to an scm availability notification). Reviewed-by: Peter Oberparleiter Signed-off-by: Sebastian Ott Signed-off-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky

s390/scm: use inline dummy functions

2013-02-14T14:55:09Z

Convert the defines for the !CONFIG_SCM* stuff to static inline functions. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky

s390/scm_block: force cluster writes

2012-09-26T13:45:01Z

Force writes to Storage Class Memory (SCM) to be in done in clusters. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky

s390: add scm block driver

2012-09-26T13:45:01Z

Block device driver for Storage Class Memory (SCM). This driver provides a block device interface for each available SCM increment. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky