Messages in this thread | | | Date | Thu, 2 May 2024 14:07:26 +0300 | From | Mathias Nyman <> | Subject | Re: [PATCH v20 06/41] usb: host: xhci-sideband: Expose a sideband interrupter enable API |
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On 26.4.2024 0.50, Wesley Cheng wrote: > Some use cases maybe require that the secondary interrupter's events to > be handled by the OS. In this case, configure the IMOD and the > skip_events property to enable the interrupter's events. By default, > assume that the secondary interrupter doesn't want to enable OS event > handling. > > Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> > --- > drivers/usb/host/xhci-sideband.c | 28 ++++++++++++++++++++++++++++ > include/linux/usb/xhci-sideband.h | 2 ++ > 2 files changed, 30 insertions(+) > > diff --git a/drivers/usb/host/xhci-sideband.c b/drivers/usb/host/xhci-sideband.c > index 255feae33c6e..6fdae9840c11 100644 > --- a/drivers/usb/host/xhci-sideband.c > +++ b/drivers/usb/host/xhci-sideband.c > @@ -237,6 +237,30 @@ xhci_sideband_get_event_buffer(struct xhci_sideband *sb) > } > EXPORT_SYMBOL_GPL(xhci_sideband_get_event_buffer); > > +/** > + * xhci_sideband_enable_interrupt - enable interrupt for secondary interrupter > + * @sb: sideband instance for this usb device > + * @imod_interval: number of event ring segments to allocate > + * > + * Enables OS owned event handling for a particular interrupter if client > + * requests for it. In addition, set the IMOD interval for this particular > + * interrupter. > + * > + * Returns 0 on success, negative error otherwise > + */ > +int xhci_sideband_enable_interrupt(struct xhci_sideband *sb, u32 imod_interval) > +{ > + if (!sb || !sb->ir) > + return -ENODEV; > + > + xhci_set_interrupter_moderation(sb->ir, imod_interval);
Is there a need to adjust the moderation after initial setup?
If not then maybe we could pass the imod_interval as a parameter to xhci_create_secondary_interrupter(), and avoid exporting xhci_set_interrupter_moderation()
> + sb->ir->skip_events = false; > + xhci_enable_interrupter(sb->ir); > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(xhci_sideband_enable_interrupt);
I can't find the place where xhci_sideband_enable_interrupt() is called in this series. How is it planned to be used?
Thanks Mathias
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