| Message ID | 20220616224531.3139080-1-swboyd@chromium.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | cpufreq: qcom-hw: Don't do lmh things without a throttle interrupt | expand |
On 6/17/22 01:45, Stephen Boyd wrote: > Offlining cpu6 and cpu7 and then onlining cpu6 hangs on > sc7180-trogdor-lazor because the throttle interrupt doesn't exist. > Similarly, things go sideways when suspend/resume runs. That's because > the qcom_cpufreq_hw_cpu_online() and qcom_cpufreq_hw_lmh_exit() > functions are calling genirq APIs with an interrupt value of '-6', i.e. > -ENXIO, and that isn't good. > > Check the value of the throttle interrupt like we already do in other > functions in this file and bail out early from lmh code to fix the hang. > > Reported-by: Rob Clark <robdclark@chromium.org> > Cc: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org> > Cc: Bjorn Andersson <bjorn.andersson@linaro.org> > Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > Fixes: a1eb080a0447 ("cpufreq: qcom-hw: provide online/offline operations") > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > --- > drivers/cpufreq/qcom-cpufreq-hw.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c > index 0253731d6d25..36c79580fba2 100644 > --- a/drivers/cpufreq/qcom-cpufreq-hw.c > +++ b/drivers/cpufreq/qcom-cpufreq-hw.c > @@ -442,6 +442,9 @@ static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy) > struct platform_device *pdev = cpufreq_get_driver_data(); > int ret; > > + if (data->throttle_irq <= 0) > + return 0; > + > ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); > if (ret) > dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", > @@ -469,6 +472,9 @@ static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy) > > static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data) > { > + if (data->throttle_irq <= 0) > + return; > + > free_irq(data->throttle_irq, data); > } > > Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org> -- Best wishes, Vladimir
On 17-06-22, 03:21, Vladimir Zapolskiy wrote: > On 6/17/22 01:45, Stephen Boyd wrote: > > Offlining cpu6 and cpu7 and then onlining cpu6 hangs on > > sc7180-trogdor-lazor because the throttle interrupt doesn't exist. > > Similarly, things go sideways when suspend/resume runs. That's because > > the qcom_cpufreq_hw_cpu_online() and qcom_cpufreq_hw_lmh_exit() > > functions are calling genirq APIs with an interrupt value of '-6', i.e. > > -ENXIO, and that isn't good. > > > > Check the value of the throttle interrupt like we already do in other > > functions in this file and bail out early from lmh code to fix the hang. > > > > Reported-by: Rob Clark <robdclark@chromium.org> > > Cc: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org> > > Cc: Bjorn Andersson <bjorn.andersson@linaro.org> > > Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > > Fixes: a1eb080a0447 ("cpufreq: qcom-hw: provide online/offline operations") > > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > > --- > > drivers/cpufreq/qcom-cpufreq-hw.c | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > > diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c > > index 0253731d6d25..36c79580fba2 100644 > > --- a/drivers/cpufreq/qcom-cpufreq-hw.c > > +++ b/drivers/cpufreq/qcom-cpufreq-hw.c > > @@ -442,6 +442,9 @@ static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy) > > struct platform_device *pdev = cpufreq_get_driver_data(); > > int ret; > > + if (data->throttle_irq <= 0) > > + return 0; > > + > > ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); > > if (ret) > > dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", > > @@ -469,6 +472,9 @@ static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy) > > static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data) > > { > > + if (data->throttle_irq <= 0) > > + return; > > + > > free_irq(data->throttle_irq, data); > > } > > > Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org> Applied. Thanks.
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 0253731d6d25..36c79580fba2 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -442,6 +442,9 @@ static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy) struct platform_device *pdev = cpufreq_get_driver_data(); int ret; + if (data->throttle_irq <= 0) + return 0; + ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); if (ret) dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", @@ -469,6 +472,9 @@ static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy) static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data) { + if (data->throttle_irq <= 0) + return; + free_irq(data->throttle_irq, data); }
Offlining cpu6 and cpu7 and then onlining cpu6 hangs on sc7180-trogdor-lazor because the throttle interrupt doesn't exist. Similarly, things go sideways when suspend/resume runs. That's because the qcom_cpufreq_hw_cpu_online() and qcom_cpufreq_hw_lmh_exit() functions are calling genirq APIs with an interrupt value of '-6', i.e. -ENXIO, and that isn't good. Check the value of the throttle interrupt like we already do in other functions in this file and bail out early from lmh code to fix the hang. Reported-by: Rob Clark <robdclark@chromium.org> Cc: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Fixes: a1eb080a0447 ("cpufreq: qcom-hw: provide online/offline operations") Signed-off-by: Stephen Boyd <swboyd@chromium.org> --- drivers/cpufreq/qcom-cpufreq-hw.c | 6 ++++++ 1 file changed, 6 insertions(+) base-commit: f2906aa863381afb0015a9eb7fefad885d4e5a56