tree 8c5cd9094d24a8181d64cd840636ab9885c8e1c1
parent 95d04f0735b4fc837bff9aedcc3f3efb20ddc3d1
author Roland Dreier <rolandd@cisco.com> 1216825967 -0700
committer Roland Dreier <rolandd@cisco.com> 1216825967 -0700

mlx4_core: Improve error message when not enough UAR pages are available

If an mlx4 device with default FW (which gives a UAR BAR size of 8 MB)
is used in a system with 64 KB pages, then there are only 8192/64==128
UAR pages available.  However, the first 128 UAR pages are reserved
for use with event queue doorbells, so no UAR pages are available to
do anything else with, which means that the driver cannot work.

The current driver fails with a fairly cryptic "Failed to allocate
driver access region, aborting" message in this situation.  Fix the
driver to detect the problem earlier and print out a clearer
description of the problem and a suggestion of how to fix it (use a
new firmware image).

Signed-off-by: Roland Dreier <rolandd@cisco.com>