drivers: qcom: rpmh-rsc: Use rcuidle tracepoints for rpmh

This tracepoint is hit now that we call into the rpmh code from the cpu
idle path. Let's move this to be an rcuidle tracepoint so that we avoid
the RCU idle splat below

 =============================
 WARNING: suspicious RCU usage
 5.4.10 #68 Tainted: G S
 -----------------------------
 drivers/soc/qcom/trace-rpmh.h:72 suspicious rcu_dereference_check() usage!

 other info that might help us debug this:

 RCU used illegally from idle CPU!
 rcu_scheduler_active = 2, debug_locks = 1
 RCU used illegally from extended quiescent state!
 5 locks held by swapper/2/0:
  #0: ffffff81745d6ee8 (&(&genpd->slock)->rlock){+.+.}, at: genpd_lock_spin+0x1c/0x2c
  #1: ffffff81745da6e8 (&(&genpd->slock)->rlock/1){....}, at: genpd_lock_nested_spin+0x24/0x34
  #2: ffffff8174f2ca20 (&(&genpd->slock)->rlock/2){....}, at: genpd_lock_nested_spin+0x24/0x34
  #3: ffffff8174f2c300 (&(&drv->client.cache_lock)->rlock){....}, at: rpmh_flush+0x48/0x24c
  #4: ffffff8174f2c150 (&(&tcs->lock)->rlock){+.+.}, at: rpmh_rsc_write_ctrl_data+0x74/0x270

 stack backtrace:
 CPU: 2 PID: 0 Comm: swapper/2 Tainted: G S                5.4.10 #68
 Call trace:
  dump_backtrace+0x0/0x174
  show_stack+0x20/0x2c
  dump_stack+0xc8/0x124
  lockdep_rcu_suspicious+0xe4/0x104
  __tcs_buffer_write+0x230/0x2d0
  rpmh_rsc_write_ctrl_data+0x210/0x270
  rpmh_flush+0x84/0x24c
  rpmh_domain_power_off+0x78/0x98
  _genpd_power_off+0x40/0xc0
  genpd_power_off+0x168/0x208
  genpd_power_off+0x1e0/0x208
  genpd_power_off+0x1e0/0x208
  genpd_runtime_suspend+0x1ac/0x220
  __rpm_callback+0x70/0xfc
  rpm_callback+0x34/0x8c
  rpm_suspend+0x218/0x4a4
  __pm_runtime_suspend+0x88/0xac
  psci_enter_domain_idle_state+0x3c/0xb4
  cpuidle_enter_state+0xb8/0x284
  cpuidle_enter+0x38/0x4c
  call_cpuidle+0x3c/0x68
  do_idle+0x194/0x260
  cpu_startup_entry+0x24/0x28
  secondary_start_kernel+0x150/0x15c

Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Fixes: a65a397f2451 ("cpuidle: psci: Add support for PM domains by using genpd")
Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20200115013751.249588-1-swboyd@chromium.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index e278fc11fe5cfa7606784901cec178c5cd5a79bd..b71822131f5989f15e802464a073df483789ae5b 100644 (file)
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -277,7 +277,7 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int tcs_id, int cmd_id,
                write_tcs_cmd(drv, RSC_DRV_CMD_MSGID, tcs_id, j, msgid);
                write_tcs_cmd(drv, RSC_DRV_CMD_ADDR, tcs_id, j, cmd->addr);
                write_tcs_cmd(drv, RSC_DRV_CMD_DATA, tcs_id, j, cmd->data);
-               trace_rpmh_send_msg(drv, tcs_id, j, msgid, cmd);
+               trace_rpmh_send_msg_rcuidle(drv, tcs_id, j, msgid, cmd);
        }
 
        write_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, tcs_id, cmd_complete);