diff options
| author | Jon Mason <jon.mason@intel.com> | 2013-09-07 01:51:16 +0200 |
|---|---|---|
| committer | Jon Mason <jon.mason@intel.com> | 2013-11-20 17:57:30 +0100 |
| commit | c529aa30337b928bd6bc34293608cb3d4505856e (patch) | |
| tree | 48cb1e6180ecb243e923f65fa8436a7fa77db8f7 /drivers/ntb/ntb_regs.h | |
| parent | Linux 3.12 (diff) | |
| download | linux-c529aa30337b928bd6bc34293608cb3d4505856e.tar.xz linux-c529aa30337b928bd6bc34293608cb3d4505856e.zip | |
NTB: Xeon Doorbell errata workaround
Modifications to the 14th bit of the B2BDOORBELL register will not be
mirrored to the remote system due to a hardware issue. To get around
the issue, shrink the number of available doorbell bits by 1. The max
number of doorbells was being used as a way to referencing the Link
Doorbell bit. Since this would no longer work, the driver must now
explicitly reference that bit.
This does not affect the xeon_errata_workaround case, as it is not using
the b2bdoorbell register.
Signed-off-by: Jon Mason <jon.mason@intel.com>
Diffstat (limited to 'drivers/ntb/ntb_regs.h')
| -rw-r--r-- | drivers/ntb/ntb_regs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ntb/ntb_regs.h b/drivers/ntb/ntb_regs.h index aa4bdd393c58..5381b65a6f3a 100644 --- a/drivers/ntb/ntb_regs.h +++ b/drivers/ntb/ntb_regs.h @@ -55,6 +55,7 @@ #define SNB_MAX_COMPAT_SPADS 16 /* Reserve the uppermost bit for link interrupt */ #define SNB_MAX_DB_BITS 15 +#define SNB_LINK_DB 15 #define SNB_DB_BITS_PER_VEC 5 #define SNB_MAX_MW 2 #define SNB_ERRATA_MAX_MW 1 |