| Message ID | 1600673819-1698-1-git-send-email-loic.poulain@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/2] bus: mhi: core: Allow shared IRQ for event rings | expand |
On Mon, Sep 21, 2020 at 09:36:58AM +0200, Loic Poulain wrote: > There is no requirement for using a dedicated IRQ per event ring. > Some systems does not support multiple MSI vectors (e.g. intel > without CONFIG_IRQ_REMAP), In that case the MHI controller can > configure all the event rings to use the same interrupt (as fallback). > > Allow this by removing the nr_irqs = ev_ring test and add extra check > in the irq_setup function. > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Thanks, Mani > --- > v2: keep nr_irqs check early in init sequence > > drivers/bus/mhi/core/init.c | 7 +++++++ > drivers/bus/mhi/core/pm.c | 2 +- > 2 files changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index 19ade8a..31961af 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -125,6 +125,13 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl) > if (mhi_event->offload_ev) > continue; > > + if (mhi_event->irq >= mhi_cntrl->nr_irqs) { > + dev_err(dev, "irq %d not available for event ring\n", > + mhi_event->irq); > + ret = -EINVAL; > + goto error_request; > + } > + > ret = request_irq(mhi_cntrl->irq[mhi_event->irq], > mhi_irq_handler, > IRQF_SHARED | IRQF_NO_SUSPEND, > diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c > index ce4d969..3de7b16 100644 > --- a/drivers/bus/mhi/core/pm.c > +++ b/drivers/bus/mhi/core/pm.c > @@ -918,7 +918,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) > > dev_info(dev, "Requested to power ON\n"); > > - if (mhi_cntrl->nr_irqs < mhi_cntrl->total_ev_rings) > + if (mhi_cntrl->nr_irqs < 1) > return -EINVAL; > > /* Supply default wake routines if not provided by controller driver */ > -- > 2.7.4 >
On Mon, Sep 21, 2020 at 09:36:58AM +0200, Loic Poulain wrote: > There is no requirement for using a dedicated IRQ per event ring. > Some systems does not support multiple MSI vectors (e.g. intel > without CONFIG_IRQ_REMAP), In that case the MHI controller can > configure all the event rings to use the same interrupt (as fallback). > > Allow this by removing the nr_irqs = ev_ring test and add extra check > in the irq_setup function. > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Applied to mhi-next! Thanks, Mani > --- > v2: keep nr_irqs check early in init sequence > > drivers/bus/mhi/core/init.c | 7 +++++++ > drivers/bus/mhi/core/pm.c | 2 +- > 2 files changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index 19ade8a..31961af 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -125,6 +125,13 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl) > if (mhi_event->offload_ev) > continue; > > + if (mhi_event->irq >= mhi_cntrl->nr_irqs) { > + dev_err(dev, "irq %d not available for event ring\n", > + mhi_event->irq); > + ret = -EINVAL; > + goto error_request; > + } > + > ret = request_irq(mhi_cntrl->irq[mhi_event->irq], > mhi_irq_handler, > IRQF_SHARED | IRQF_NO_SUSPEND, > diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c > index ce4d969..3de7b16 100644 > --- a/drivers/bus/mhi/core/pm.c > +++ b/drivers/bus/mhi/core/pm.c > @@ -918,7 +918,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) > > dev_info(dev, "Requested to power ON\n"); > > - if (mhi_cntrl->nr_irqs < mhi_cntrl->total_ev_rings) > + if (mhi_cntrl->nr_irqs < 1) > return -EINVAL; > > /* Supply default wake routines if not provided by controller driver */ > -- > 2.7.4 >
On 2020-09-21 00:36, Loic Poulain wrote: > There is no requirement for using a dedicated IRQ per event ring. > Some systems does not support multiple MSI vectors (e.g. intel > without CONFIG_IRQ_REMAP), In that case the MHI controller can > configure all the event rings to use the same interrupt (as fallback). > > Allow this by removing the nr_irqs = ev_ring test and add extra check > in the irq_setup function. > > Signed-off-by: Loic Poulain <loic.poulain@linaro.org> > --- > v2: keep nr_irqs check early in init sequence > > drivers/bus/mhi/core/init.c | 7 +++++++ > drivers/bus/mhi/core/pm.c | 2 +- > 2 files changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index 19ade8a..31961af 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -125,6 +125,13 @@ int mhi_init_irq_setup(struct mhi_controller > *mhi_cntrl) > if (mhi_event->offload_ev) > continue; > > + if (mhi_event->irq >= mhi_cntrl->nr_irqs) { > + dev_err(dev, "irq %d not available for event ring\n", > + mhi_event->irq); > + ret = -EINVAL; > + goto error_request; > + } > + > ret = request_irq(mhi_cntrl->irq[mhi_event->irq], > mhi_irq_handler, > IRQF_SHARED | IRQF_NO_SUSPEND, > diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c > index ce4d969..3de7b16 100644 > --- a/drivers/bus/mhi/core/pm.c > +++ b/drivers/bus/mhi/core/pm.c > @@ -918,7 +918,7 @@ int mhi_async_power_up(struct mhi_controller > *mhi_cntrl) > > dev_info(dev, "Requested to power ON\n"); > > - if (mhi_cntrl->nr_irqs < mhi_cntrl->total_ev_rings) > + if (mhi_cntrl->nr_irqs < 1) > return -EINVAL; > > /* Supply default wake routines if not provided by controller driver > */ It would be better if we can remove this check altogether from the mhi_async_power_up() function and instead place it as one of the checks in mhi_register_controller() in init.c. That way, we don't have to wait until power up attempt to determine whether the provided controller configuration is acceptable and can bail out early from the mhi_register_controller() function itself. if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put || !mhi_cntrl->status_cb || !mhi_cntrl->read_reg || - !mhi_cntrl->write_reg) + !mhi_cntrl->write_reg || !mhi_cntrl->nr_irqs) Thanks, Bhaumik
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 19ade8a..31961af 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -125,6 +125,13 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl) if (mhi_event->offload_ev) continue; + if (mhi_event->irq >= mhi_cntrl->nr_irqs) { + dev_err(dev, "irq %d not available for event ring\n", + mhi_event->irq); + ret = -EINVAL; + goto error_request; + } + ret = request_irq(mhi_cntrl->irq[mhi_event->irq], mhi_irq_handler, IRQF_SHARED | IRQF_NO_SUSPEND, diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index ce4d969..3de7b16 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -918,7 +918,7 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) dev_info(dev, "Requested to power ON\n"); - if (mhi_cntrl->nr_irqs < mhi_cntrl->total_ev_rings) + if (mhi_cntrl->nr_irqs < 1) return -EINVAL; /* Supply default wake routines if not provided by controller driver */
There is no requirement for using a dedicated IRQ per event ring. Some systems does not support multiple MSI vectors (e.g. intel without CONFIG_IRQ_REMAP), In that case the MHI controller can configure all the event rings to use the same interrupt (as fallback). Allow this by removing the nr_irqs = ev_ring test and add extra check in the irq_setup function. Signed-off-by: Loic Poulain <loic.poulain@linaro.org> --- v2: keep nr_irqs check early in init sequence drivers/bus/mhi/core/init.c | 7 +++++++ drivers/bus/mhi/core/pm.c | 2 +- 2 files changed, 8 insertions(+), 1 deletion(-)