linux.git/include/trace/events/ib_mad.h, branch vsnprintf

IB/mad: Don't call to function that might sleep while in atomic context

2022-11-10T08:57:15+00:00

Tracepoints are not allowed to sleep, as such the following splat is
generated due to call to ib_query_pkey() in atomic context.

WARNING: CPU: 0 PID: 1888000 at kernel/trace/ring_buffer.c:2492 rb_commit+0xc1/0x220
CPU: 0 PID: 1888000 Comm: kworker/u9:0 Kdump: loaded Tainted: G           OE    --------- -  - 4.18.0-305.3.1.el8.x86_64 #1
 Hardware name: Red Hat KVM, BIOS 1.13.0-2.module_el8.3.0+555+a55c8938 04/01/2014
 Workqueue: ib-comp-unb-wq ib_cq_poll_work [ib_core]
 RIP: 0010:rb_commit+0xc1/0x220
 RSP: 0000:ffffa8ac80f9bca0 EFLAGS: 00010202
 RAX: ffff8951c7c01300 RBX: ffff8951c7c14a00 RCX: 0000000000000246
 RDX: ffff8951c707c000 RSI: ffff8951c707c57c RDI: ffff8951c7c14a00
 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
 R10: ffff8951c7c01300 R11: 0000000000000001 R12: 0000000000000246
 R13: 0000000000000000 R14: ffffffff964c70c0 R15: 0000000000000000
 FS:  0000000000000000(0000) GS:ffff8951fbc00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00007f20e8f39010 CR3: 000000002ca10005 CR4: 0000000000170ef0
 Call Trace:
  ring_buffer_unlock_commit+0x1d/0xa0
  trace_buffer_unlock_commit_regs+0x3b/0x1b0
  trace_event_buffer_commit+0x67/0x1d0
  trace_event_raw_event_ib_mad_recv_done_handler+0x11c/0x160 [ib_core]
  ib_mad_recv_done+0x48b/0xc10 [ib_core]
  ? trace_event_raw_event_cq_poll+0x6f/0xb0 [ib_core]
  __ib_process_cq+0x91/0x1c0 [ib_core]
  ib_cq_poll_work+0x26/0x80 [ib_core]
  process_one_work+0x1a7/0x360
  ? create_worker+0x1a0/0x1a0
  worker_thread+0x30/0x390
  ? create_worker+0x1a0/0x1a0
  kthread+0x116/0x130
  ? kthread_flush_work_fn+0x10/0x10
  ret_from_fork+0x35/0x40
 ---[ end trace 78ba8509d3830a16 ]---

Fixes: 821bf1de45a1 ("IB/MAD: Add recv path trace point")
Signed-off-by: Leonid Ravich 
Link: https://lore.kernel.org/r/Y2t5feomyznrVj7V@leonid-Inspiron-3421
Signed-off-by: Leon Romanovsky

IB/MAD: Add SMP details to MAD tracing

2019-03-27T18:52:01+00:00

Decode more information from the packet and include it in the trace.

Reviewed-by: "Ruhl, Michael J" 
Signed-off-by: Ira Weiny 
Signed-off-by: Jason Gunthorpe

IB/MAD: Add agent trace points

2019-03-27T18:52:00+00:00

Trace agent details when agents are [un]registered.  In addition, report
agent details on send/recv.

Reviewed-by: "Ruhl, Michael J" 
Reviewed-by: Steven Rostedt (VMware) 
Signed-off-by: Ira Weiny 
Signed-off-by: Jason Gunthorpe

IB/MAD: Add recv path trace point

2019-03-27T18:52:00+00:00

Trace received MAD details.

Reviewed-by: "Ruhl, Michael J" 
Reviewed-by: Steven Rostedt (VMware) 
Signed-off-by: Ira Weiny 
Signed-off-by: Jason Gunthorpe

IB/MAD: Add send path trace points

2019-03-27T18:52:00+00:00

Use the standard Linux trace mechanism to trace MADs being sent.  4 trace
points are added, when the MAD is posted to the qp, when the MAD is
completed, if a MAD is resent, and when the MAD completes in error.

Reviewed-by: "Ruhl, Michael J" 
Suggested-by: Steven Rostedt (VMware) 
Reviewed-by: Steven Rostedt (VMware) 
Signed-off-by: Ira Weiny 
Signed-off-by: Jason Gunthorpe