diff options
| author | Joachim Fenkes <fenkes@de.ibm.com> | 2007-12-10 20:59:10 +0300 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2007-12-13 01:09:43 +0300 |
| commit | 4faf7757955239c1b259e7dab224d4638a99b456 (patch) | |
| tree | d6e56aef1706cf26c0daa67bad150cb88ad7f52f /drivers/infiniband/hw/ehca/hcp_if.c | |
| parent | 1457edc72d187f452be1374c7d9281f1dfa16f32 (diff) | |
| download | linux-4faf7757955239c1b259e7dab224d4638a99b456.tar.xz | |
IB/ehca: Serialize HCA-related hCalls if necessary
Several pSeries firmware versions share a rare locking issue in the
HCA-related hCalls. Check for a feature flag that indicates the issue
being fixed and serialize all HCA hCalls if not.
Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ehca/hcp_if.c')
| -rw-r--r-- | drivers/infiniband/hw/ehca/hcp_if.c | 28 |
1 files changed, 11 insertions, 17 deletions
diff --git a/drivers/infiniband/hw/ehca/hcp_if.c b/drivers/infiniband/hw/ehca/hcp_if.c index c16a21374bb5..331b5e82ef77 100644 --- a/drivers/infiniband/hw/ehca/hcp_if.c +++ b/drivers/infiniband/hw/ehca/hcp_if.c @@ -89,6 +89,7 @@ #define HCALL9_REGS_FORMAT HCALL7_REGS_FORMAT " r11=%lx r12=%lx" static DEFINE_SPINLOCK(hcall_lock); +extern int ehca_lock_hcalls; static u32 get_longbusy_msecs(int longbusy_rc) { @@ -120,26 +121,21 @@ static long ehca_plpar_hcall_norets(unsigned long opcode, unsigned long arg7) { long ret; - int i, sleep_msecs, do_lock; - unsigned long flags; + int i, sleep_msecs; + unsigned long flags = 0; ehca_gen_dbg("opcode=%lx " HCALL7_REGS_FORMAT, opcode, arg1, arg2, arg3, arg4, arg5, arg6, arg7); - /* lock H_FREE_RESOURCE(MR) against itself and H_ALLOC_RESOURCE(MR) */ - if ((opcode == H_FREE_RESOURCE) && (arg7 == 5)) { - arg7 = 0; /* better not upset firmware */ - do_lock = 1; - } - for (i = 0; i < 5; i++) { - if (do_lock) + /* serialize hCalls to work around firmware issue */ + if (ehca_lock_hcalls) spin_lock_irqsave(&hcall_lock, flags); ret = plpar_hcall_norets(opcode, arg1, arg2, arg3, arg4, arg5, arg6, arg7); - if (do_lock) + if (ehca_lock_hcalls) spin_unlock_irqrestore(&hcall_lock, flags); if (H_IS_LONG_BUSY(ret)) { @@ -174,24 +170,22 @@ static long ehca_plpar_hcall9(unsigned long opcode, unsigned long arg9) { long ret; - int i, sleep_msecs, do_lock; + int i, sleep_msecs; unsigned long flags = 0; ehca_gen_dbg("INPUT -- opcode=%lx " HCALL9_REGS_FORMAT, opcode, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9); - /* lock H_ALLOC_RESOURCE(MR) against itself and H_FREE_RESOURCE(MR) */ - do_lock = ((opcode == H_ALLOC_RESOURCE) && (arg2 == 5)); - for (i = 0; i < 5; i++) { - if (do_lock) + /* serialize hCalls to work around firmware issue */ + if (ehca_lock_hcalls) spin_lock_irqsave(&hcall_lock, flags); ret = plpar_hcall9(opcode, outs, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9); - if (do_lock) + if (ehca_lock_hcalls) spin_unlock_irqrestore(&hcall_lock, flags); if (H_IS_LONG_BUSY(ret)) { @@ -821,7 +815,7 @@ u64 hipz_h_free_resource_mr(const struct ipz_adapter_handle adapter_handle, return ehca_plpar_hcall_norets(H_FREE_RESOURCE, adapter_handle.handle, /* r4 */ mr->ipz_mr_handle.handle, /* r5 */ - 0, 0, 0, 0, 5); + 0, 0, 0, 0, 0); } u64 hipz_h_reregister_pmr(const struct ipz_adapter_handle adapter_handle, |