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author | 2020-03-20 14:00:00 +0100 | |
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committer | 2020-04-06 13:13:50 +0200 | |
commit | d8564e19da8c8b31c7fc160942f95b113f554211 (patch) | |
tree | aed39c231d9207fee043094363b911e3cbf663f8 /drivers/s390/scsi/zfcp_qdio.h | |
parent | zfcp: inline zfcp_qdio_setup_init_data() (diff) | |
download | linux-d8564e19da8c8b31c7fc160942f95b113f554211.tar.gz linux-d8564e19da8c8b31c7fc160942f95b113f554211.tar.bz2 linux-d8564e19da8c8b31c7fc160942f95b113f554211.zip |
s390/qdio: allow for non-contiguous SBAL array in init_data
Upper-layer drivers allocate their SBALs by calling qdio_alloc_buffers()
for each individual queue. But when later passing the SBAL addresses to
qdio_establish(), they need to be in a single array of pointers.
So if the driver uses multiple Input or Output queues, it needs to
allocate a temporary array just to present all its SBAL pointers in this
layout.
This patch slightly changes the format of the QDIO initialization data,
so that drivers can pass a per-queue array where each element points to
a queue's SBAL array.
zfcp doesn't use multiple queues, so the impact there is trivial.
For qeth this brings a nice reduction in complexity, and removes
a page-sized allocation.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'drivers/s390/scsi/zfcp_qdio.h')
0 files changed, 0 insertions, 0 deletions