From: Wesley Cheng <quic_wcheng@quicinc.com> To: Mathias Nyman <mathias.nyman@linux.intel.com>, <srinivas.kandagatla@linaro.org>, <mathias.nyman@intel.com>, <perex@perex.cz>, <broonie@kernel.org>, <lgirdwood@gmail.com>, <andersson@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>, <gregkh@linuxfoundation.org>, <Thinh.Nguyen@synopsys.com>, <bgoswami@quicinc.com>, <tiwai@suse.com>, <robh+dt@kernel.org>, <agross@kernel.org> Cc: <linux-kernel@vger.kernel.org>, <linux-arm-msm@vger.kernel.org>, <alsa-devel@alsa-project.org>, <devicetree@vger.kernel.org>, <linux-usb@vger.kernel.org>, <quic_jackp@quicinc.com>, <quic_plai@quicinc.com> Subject: Re: [RFC PATCH 07/14] usb: host: xhci: Add XHCI secondary interrupter support Date: Thu, 29 Dec 2022 13:14:43 -0800 [thread overview] Message-ID: <f7f80320-02bb-a573-dd95-b6d58c260624@quicinc.com> (raw) In-Reply-To: <7dfe215b-4cc7-f95f-17c3-563c0120151a@linux.intel.com> Hi Mathias, On 12/28/2022 7:47 AM, Mathias Nyman wrote: > On 24.12.2022 1.31, Wesley Cheng wrote: >> Implement the XHCI operations for allocating and requesting for a >> secondary >> interrupter. The secondary interrupter can allow for events for a >> particular endpoint to be routed to a separate event ring. The event >> routing is defined when submitting a transfer descriptor to the USB HW. >> There is a specific field which denotes which interrupter ring to >> route the >> event to when the transfer is completed. >> >> An example use case, such as audio packet offloading can utilize a >> separate >> event ring, so that these events can be routed to a different processor >> within the system. The processor would be able to independently submit >> transfers and handle its completions without intervention from the main >> processor. >> > > Adding support for more xHCI interrupters than just the primary one make > sense for > both the offloading and virtualization cases. > > xHCI support for several interrupters was probably added to support > virtualization, > to hand over usb devices to virtual machines and give them their own > event ring and > MSI/MSI-X vector. > > In this offloading case you probably want to avoid xHC interrupts from > this device > completely, making sure it doesn't wake up the main CPU unnecessarily. > > So is the idea here to let xhci driver set up the new interrupter, its > event ring, > and the endpoint transfer rings. Then pass the address of the endpoint > transfer rings > and the new event ring to the separate processor. > > This separate processor then both polls the event ring for new events, > sets its dequeue > pointer, clears EHB bit, and queues new TRBs on the transfer ring. > > so xhci driver does not handle any events for the audio part, and no > audio data URBs > are sent to usb core? Your entire description is correct. To clarify, the interfaces which are non-audio will still be handled by the main processor. For example, a USB headset can have a HID interface as well for volume control. The HID interface will still be handled by the main processor, and events routed to the main event ring. > > How about the control part? > Is the control endpoint for this device still handled normally by usb > core/xhci? > Control transfers are always handled on the main processor. Only audio interface's endpoints. > For the xhci parts I think we should start start by adding generic > support for several > interrupters, then add parts needed for offloading. I can split up the patchsets to add interrupters first, then adding the offloading APIs in a separate patch. Thanks Wesley Cheng
WARNING: multiple messages have this Message-ID (diff)
From: Wesley Cheng <quic_wcheng@quicinc.com> To: Mathias Nyman <mathias.nyman@linux.intel.com>, <srinivas.kandagatla@linaro.org>, <mathias.nyman@intel.com>, <perex@perex.cz>, <broonie@kernel.org>, <lgirdwood@gmail.com>, <andersson@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>, <gregkh@linuxfoundation.org>, <Thinh.Nguyen@synopsys.com>, <bgoswami@quicinc.com>, <tiwai@suse.com>, <robh+dt@kernel.org>, <agross@kernel.org> Cc: devicetree@vger.kernel.org, alsa-devel@alsa-project.org, linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, quic_jackp@quicinc.com, quic_plai@quicinc.com Subject: Re: [RFC PATCH 07/14] usb: host: xhci: Add XHCI secondary interrupter support Date: Thu, 29 Dec 2022 13:14:43 -0800 [thread overview] Message-ID: <f7f80320-02bb-a573-dd95-b6d58c260624@quicinc.com> (raw) In-Reply-To: <7dfe215b-4cc7-f95f-17c3-563c0120151a@linux.intel.com> Hi Mathias, On 12/28/2022 7:47 AM, Mathias Nyman wrote: > On 24.12.2022 1.31, Wesley Cheng wrote: >> Implement the XHCI operations for allocating and requesting for a >> secondary >> interrupter. The secondary interrupter can allow for events for a >> particular endpoint to be routed to a separate event ring. The event >> routing is defined when submitting a transfer descriptor to the USB HW. >> There is a specific field which denotes which interrupter ring to >> route the >> event to when the transfer is completed. >> >> An example use case, such as audio packet offloading can utilize a >> separate >> event ring, so that these events can be routed to a different processor >> within the system. The processor would be able to independently submit >> transfers and handle its completions without intervention from the main >> processor. >> > > Adding support for more xHCI interrupters than just the primary one make > sense for > both the offloading and virtualization cases. > > xHCI support for several interrupters was probably added to support > virtualization, > to hand over usb devices to virtual machines and give them their own > event ring and > MSI/MSI-X vector. > > In this offloading case you probably want to avoid xHC interrupts from > this device > completely, making sure it doesn't wake up the main CPU unnecessarily. > > So is the idea here to let xhci driver set up the new interrupter, its > event ring, > and the endpoint transfer rings. Then pass the address of the endpoint > transfer rings > and the new event ring to the separate processor. > > This separate processor then both polls the event ring for new events, > sets its dequeue > pointer, clears EHB bit, and queues new TRBs on the transfer ring. > > so xhci driver does not handle any events for the audio part, and no > audio data URBs > are sent to usb core? Your entire description is correct. To clarify, the interfaces which are non-audio will still be handled by the main processor. For example, a USB headset can have a HID interface as well for volume control. The HID interface will still be handled by the main processor, and events routed to the main event ring. > > How about the control part? > Is the control endpoint for this device still handled normally by usb > core/xhci? > Control transfers are always handled on the main processor. Only audio interface's endpoints. > For the xhci parts I think we should start start by adding generic > support for several > interrupters, then add parts needed for offloading. I can split up the patchsets to add interrupters first, then adding the offloading APIs in a separate patch. Thanks Wesley Cheng
next prev parent reply other threads:[~2022-12-29 21:16 UTC|newest] Thread overview: 171+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-12-23 23:31 [RFC PATCH 00/14] Introduce QC USB SND audio offloading support Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-23 23:31 ` [RFC PATCH 01/14] ASoC: Add SOC USB APIs for adding an USB backend Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 6:48 ` Greg KH 2022-12-24 6:48 ` Greg KH 2022-12-23 23:31 ` [RFC PATCH 02/14] ASoC: qcom: qdsp6: Introduce USB AFE port to q6dsp Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 1:37 ` kernel test robot 2023-01-04 23:33 ` Pierre-Louis Bossart 2023-01-06 1:05 ` Wesley Cheng 2023-01-06 1:05 ` Wesley Cheng 2023-01-06 16:09 ` Pierre-Louis Bossart 2023-01-07 0:51 ` Wesley Cheng 2023-01-07 0:51 ` Wesley Cheng 2023-01-05 18:09 ` Krzysztof Kozlowski 2023-01-05 18:09 ` Krzysztof Kozlowski 2023-01-06 1:32 ` Wesley Cheng 2023-01-06 1:32 ` Wesley Cheng 2022-12-23 23:31 ` [RFC PATCH 03/14] ASoC: qcom: Add USB backend ASoC driver for Q6 Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 2:17 ` kernel test robot 2022-12-24 2:17 ` kernel test robot 2022-12-24 9:02 ` Greg KH 2022-12-24 9:02 ` Greg KH 2022-12-27 13:04 ` Mark Brown 2022-12-27 13:04 ` Mark Brown 2022-12-27 13:45 ` Greg KH 2022-12-27 13:45 ` Greg KH 2022-12-27 14:02 ` Takashi Iwai 2022-12-27 14:02 ` Takashi Iwai 2022-12-27 14:11 ` Mark Brown 2022-12-27 14:11 ` Mark Brown 2022-12-27 15:11 ` Mark Brown 2022-12-27 15:11 ` Mark Brown 2022-12-27 21:06 ` Wesley Cheng 2022-12-27 21:06 ` Wesley Cheng 2022-12-27 21:07 ` Wesley Cheng 2022-12-27 21:07 ` Wesley Cheng 2023-01-04 23:41 ` Pierre-Louis Bossart 2023-01-06 1:05 ` Wesley Cheng 2023-01-06 1:05 ` Wesley Cheng 2023-01-06 16:16 ` Pierre-Louis Bossart 2022-12-23 23:31 ` [RFC PATCH 04/14] sound: usb: card: Introduce USB SND vendor op callbacks Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 11:03 ` Dmitry Baryshkov 2022-12-24 11:03 ` Dmitry Baryshkov 2022-12-27 21:07 ` Wesley Cheng 2022-12-27 21:07 ` Wesley Cheng 2022-12-27 21:33 ` Dmitry Baryshkov 2022-12-27 21:33 ` Dmitry Baryshkov 2022-12-29 13:49 ` Oliver Neukum 2022-12-29 13:49 ` Oliver Neukum 2022-12-29 14:20 ` Takashi Iwai 2022-12-29 14:20 ` Takashi Iwai 2022-12-30 7:10 ` Wesley Cheng 2022-12-30 7:10 ` Wesley Cheng 2023-01-03 12:20 ` Oliver Neukum 2023-01-03 12:20 ` Oliver Neukum 2023-01-03 12:49 ` Takashi Iwai 2023-01-03 12:49 ` Takashi Iwai 2023-01-03 23:45 ` Wesley Cheng 2023-01-03 23:45 ` Wesley Cheng 2022-12-23 23:31 ` [RFC PATCH 05/14] sound: usb: Export USB SND APIs for modules Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 6:48 ` Greg KH 2022-12-24 6:48 ` Greg KH 2022-12-23 23:31 ` [RFC PATCH 06/14] usb: core: hcd: Introduce USB HCD APIs for interrupter management Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 8:54 ` Greg KH 2022-12-24 8:54 ` Greg KH 2022-12-27 21:13 ` Wesley Cheng 2022-12-27 21:13 ` Wesley Cheng 2022-12-24 15:29 ` Alan Stern 2022-12-24 15:29 ` Alan Stern 2022-12-27 21:07 ` Wesley Cheng 2022-12-27 21:07 ` Wesley Cheng 2022-12-28 8:59 ` Oliver Neukum 2022-12-28 8:59 ` Oliver Neukum 2022-12-28 15:16 ` Alan Stern 2022-12-28 15:16 ` Alan Stern 2022-12-28 20:31 ` Wesley Cheng 2022-12-28 20:31 ` Wesley Cheng 2022-12-29 1:41 ` Alan Stern 2022-12-29 1:41 ` Alan Stern 2022-12-23 23:31 ` [RFC PATCH 07/14] usb: host: xhci: Add XHCI secondary interrupter support Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 5:59 ` kernel test robot 2022-12-24 8:55 ` Greg KH 2022-12-24 8:55 ` Greg KH 2022-12-28 15:47 ` Mathias Nyman 2022-12-28 15:47 ` Mathias Nyman 2022-12-29 21:14 ` Wesley Cheng [this message] 2022-12-29 21:14 ` Wesley Cheng 2023-01-02 16:38 ` Mathias Nyman 2023-01-02 16:38 ` Mathias Nyman 2023-01-09 20:24 ` Wesley Cheng 2023-01-09 20:24 ` Wesley Cheng 2023-01-10 19:47 ` Mathias Nyman 2023-01-10 19:47 ` Mathias Nyman 2023-01-10 20:03 ` Wesley Cheng 2023-01-10 20:03 ` Wesley Cheng 2023-01-11 3:11 ` Wesley Cheng 2023-01-11 3:11 ` Wesley Cheng 2023-01-12 9:24 ` Mathias Nyman 2023-01-12 9:24 ` Mathias Nyman 2023-01-13 0:34 ` Wesley Cheng 2023-01-13 0:34 ` Wesley Cheng 2022-12-23 23:31 ` [RFC PATCH 08/14] usb: dwc3: Add DT parameter to specify maximum number of interrupters Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 11:13 ` Dmitry Baryshkov 2022-12-24 11:13 ` Dmitry Baryshkov 2022-12-26 12:28 ` Krzysztof Kozlowski 2022-12-26 12:28 ` Krzysztof Kozlowski 2022-12-27 21:06 ` Wesley Cheng 2022-12-27 21:06 ` Wesley Cheng 2022-12-23 23:31 ` [RFC PATCH 09/14] sound: usb: Introduce QC USB SND offloading support Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 2:27 ` kernel test robot 2023-01-02 17:28 ` Takashi Iwai 2023-01-02 17:28 ` Takashi Iwai 2023-01-04 22:38 ` Wesley Cheng 2023-01-04 22:38 ` Wesley Cheng 2023-01-04 23:51 ` Pierre-Louis Bossart 2023-01-06 1:06 ` Wesley Cheng 2023-01-06 1:06 ` Wesley Cheng 2022-12-23 23:31 ` [RFC PATCH 10/14] sound: usb: card: Check for support for requested audio format Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 8:59 ` Greg KH 2022-12-24 8:59 ` Greg KH 2022-12-27 21:07 ` Wesley Cheng 2022-12-27 21:07 ` Wesley Cheng 2022-12-27 20:31 ` kernel test robot 2022-12-23 23:31 ` [RFC PATCH 11/14] sound: soc: soc-usb: Add PCM format check API for USB backend Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 2:17 ` kernel test robot 2022-12-24 2:17 ` kernel test robot 2022-12-23 23:31 ` [RFC PATCH 12/14] sound: soc: qcom: qusb6: Ensure PCM format is supported by USB audio device Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-24 8:19 ` Sergey Shtylyov 2022-12-24 8:19 ` Sergey Shtylyov 2022-12-24 8:50 ` Wesley Cheng 2022-12-24 8:50 ` Wesley Cheng 2023-01-03 17:44 ` Mark Brown 2023-01-03 17:44 ` Mark Brown 2022-12-23 23:31 ` [RFC PATCH 13/14] ASoC: dt-bindings: Add Q6USB backend bindings Wesley Cheng 2022-12-23 23:31 ` Wesley Cheng 2022-12-26 12:25 ` Krzysztof Kozlowski 2022-12-26 12:25 ` Krzysztof Kozlowski 2022-12-23 23:32 ` [RFC PATCH 14/14] ASoC: dt-bindings: Update example for enabling USB offload on SM8250 Wesley Cheng 2022-12-23 23:32 ` Wesley Cheng 2022-12-26 12:27 ` Krzysztof Kozlowski 2022-12-26 12:27 ` Krzysztof Kozlowski 2023-01-03 17:46 ` Mark Brown 2023-01-03 17:46 ` Mark Brown 2023-01-05 18:09 ` Krzysztof Kozlowski 2023-01-05 18:09 ` Krzysztof Kozlowski 2023-01-04 0:46 ` Rob Herring 2023-01-04 0:46 ` Rob Herring 2022-12-24 6:45 ` [RFC PATCH 00/14] Introduce QC USB SND audio offloading support Greg KH 2022-12-24 6:45 ` Greg KH 2022-12-24 8:49 ` Wesley Cheng 2022-12-24 8:49 ` Wesley Cheng 2022-12-27 14:36 ` Mark Brown 2022-12-27 14:36 ` Mark Brown 2023-01-04 23:19 ` Pierre-Louis Bossart 2023-01-06 1:05 ` Wesley Cheng 2023-01-06 1:05 ` Wesley Cheng 2023-01-06 15:57 ` Pierre-Louis Bossart 2023-01-07 0:46 ` Wesley Cheng 2023-01-07 0:46 ` Wesley Cheng
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