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Fri, 24 Mar 2023 00:12:51 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 32O0CohE012724 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 24 Mar 2023 00:12:50 GMT Received: from [10.110.110.35] (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.41; Thu, 23 Mar 2023 17:12:49 -0700 Message-ID: <6025a716-739e-671e-af95-44b397a695c4@quicinc.com> Date: Thu, 23 Mar 2023 17:12:48 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH v12 6/6] usb: gadget: f_ecm: Add suspend/resume and remote wakeup support Content-Language: en-US From: Elson Serrao To: Thinh Nguyen CC: "gregkh@linuxfoundation.org" , "linux-kernel@vger.kernel.org" , "linux-usb@vger.kernel.org" , "quic_wcheng@quicinc.com" , "quic_jackp@quicinc.com" References: <1679009888-8239-1-git-send-email-quic_eserrao@quicinc.com> <1679009888-8239-7-git-send-email-quic_eserrao@quicinc.com> <20230317001149.nlvcj2y3fuvq32qt@synopsys.com> <0bf5bddd-515b-76b6-f22f-9da10a140d83@quicinc.com> <20230317212831.bcapq26jnuk2vkws@synopsys.com> <20230317231956.w3kr3zcy44odxdko@synopsys.com> <2632a958-2750-c057-2606-c2541efff392@quicinc.com> <20230318022558.z5v5ktfus5yt4atc@synopsys.com> In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: 2qNBEwpH3dx0DQPiFuTHuVbL7350Yakb X-Proofpoint-ORIG-GUID: 2qNBEwpH3dx0DQPiFuTHuVbL7350Yakb X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-23_13,2023-03-23_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 phishscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 impostorscore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2303230175 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_LOW, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/20/2023 10:42 AM, Elson Serrao wrote: > > > On 3/17/2023 7:26 PM, Thinh Nguyen wrote: >> On Fri, Mar 17, 2023, Elson Serrao wrote: >>> >>> >>> On 3/17/2023 4:20 PM, Thinh Nguyen wrote: >>>> On Fri, Mar 17, 2023, Thinh Nguyen wrote: >>>>> On Fri, Mar 17, 2023, Elson Serrao wrote: >>>>>> >>>>>> >>>>>> On 3/16/2023 5:11 PM, Thinh Nguyen wrote: >>>>>>> On Thu, Mar 16, 2023, Elson Roy Serrao wrote: >>>>>>>> When host sends a suspend notification to the device, handle >>>>>>>> the suspend callbacks in the function driver. Enhanced super >>>>>>>> speed devices can support function suspend feature to put the >>>>>>>> function in suspend state. Handle function suspend callback. >>>>>>>> >>>>>>>> Depending on the remote wakeup capability the device can either >>>>>>>> trigger a remote wakeup or wait for the host initiated resume to >>>>>>>> start data transfer again. >>>>>>>> >>>>>>>> Signed-off-by: Elson Roy Serrao >>>>>>>> --- >>>>>>>>     drivers/usb/gadget/function/f_ecm.c   | 71 >>>>>>>> +++++++++++++++++++++++++++++++++++ >>>>>>>>     drivers/usb/gadget/function/u_ether.c | 63 >>>>>>>> +++++++++++++++++++++++++++++++ >>>>>>>>     drivers/usb/gadget/function/u_ether.h |  4 ++ >>>>>>>>     3 files changed, 138 insertions(+) >>>>>>>> >>>>>>>> diff --git a/drivers/usb/gadget/function/f_ecm.c >>>>>>>> b/drivers/usb/gadget/function/f_ecm.c >>>>>>>> index a7ab30e..c43cd557 100644 >>>>>>>> --- a/drivers/usb/gadget/function/f_ecm.c >>>>>>>> +++ b/drivers/usb/gadget/function/f_ecm.c >>>>>>>> @@ -633,6 +633,8 @@ static void ecm_disable(struct usb_function *f) >>>>>>>>         usb_ep_disable(ecm->notify); >>>>>>>>         ecm->notify->desc = NULL; >>>>>>>> +    f->func_suspended = false; >>>>>>>> +    f->func_wakeup_armed = false; >>>>>>>>     } >>>>>>>> >>>>>>>> /*-------------------------------------------------------------------------*/ >>>>>>>> >>>>>>>> @@ -885,6 +887,71 @@ static struct usb_function_instance >>>>>>>> *ecm_alloc_inst(void) >>>>>>>>         return &opts->func_inst; >>>>>>>>     } >>>>>>>> +static void ecm_suspend(struct usb_function *f) >>>>>>>> +{ >>>>>>>> +    struct f_ecm *ecm = func_to_ecm(f); >>>>>>>> +    struct usb_composite_dev *cdev = ecm->port.func.config->cdev; >>>>>>>> + >>>>>>>> +    if (f->func_suspended) { >>>>>>>> +        DBG(cdev, "Function already suspended\n"); >>>>>>>> +        return; >>>>>>>> +    } >>>>>>>> + >>>>>>>> +    DBG(cdev, "ECM Suspend\n"); >>>>>>>> + >>>>>>>> +    gether_suspend(&ecm->port); >>>>>>>> +} >>>>>>>> + >>>>>>>> +static void ecm_resume(struct usb_function *f) >>>>>>>> +{ >>>>>>>> +    struct f_ecm *ecm = func_to_ecm(f); >>>>>>>> +    struct usb_composite_dev *cdev = ecm->port.func.config->cdev; >>>>>>>> + >>>>>>>> +    /* >>>>>>>> +     * If the function is in USB3 Function Suspend state, >>>>>>>> resume is >>>>>>>> +     * canceled. In this case resume is done by a Function >>>>>>>> Resume request. >>>>>>>> +     */ >>>>>>>> +    if (f->func_suspended) >>>>>>>> +        return; >>>>>>>> + >>>>>>>> +    DBG(cdev, "ECM Resume\n"); >>>>>>>> + >>>>>>>> +    gether_resume(&ecm->port); >>>>>>>> +} >>>>>>>> + >>>>>>>> +static int ecm_get_status(struct usb_function *f) >>>>>>>> +{ >>>>>>>> +    struct usb_configuration *c = f->config; >>>>>>>> + >>>>>>>> +    /* D0 and D1 bit set to 0 if device is not wakeup capable */ >>>>>>>> +    if (!(USB_CONFIG_ATT_WAKEUP & c->bmAttributes)) >>>>>>>> +        return 0; >>>>>>>> + >>>>>>>> +    return (f->func_wakeup_armed ? USB_INTRF_STAT_FUNC_RW : 0) | >>>>>>>> +        USB_INTRF_STAT_FUNC_RW_CAP; >>>>>>>> +} >>>>>>> >>>>>>> Why do we need to implement ecm_get_status if it's already >>>>>>> handled in >>>>>>> composite.c now? >>>>>>> >>>>>> >>>>>> Yes this can be removed now. Will modify accordingly. >>>>>>>> + >>>>>>>> +static int ecm_func_suspend(struct usb_function *f, u8 options) >>>>>>>> +{ >>>>>>>> +    struct usb_composite_dev *cdev = f->config->cdev; >>>>>>>> + >>>>>>>> +    DBG(cdev, "func susp %u cmd\n", options); >>>>>>>> + >>>>>>>> +    if (options & (USB_INTRF_FUNC_SUSPEND_LP >> 8)) { >>>>>>> >>>>>>> This feature selector doesn't indicate whether it's SetFeature or >>>>>>> ClearFeature request. ecm_func_suspend is supposed to be for >>>>>>> SetFeature(suspend) only. Perhaps we may have to define >>>>>>> func_resume() >>>>>>> for ClearFeature(suspend)? >>>>>>> >>>>> >>>>>> Host uses the same feature selector FUNCTION_SUSPEND for function >>>>>> suspend >>>>>> and function resume and func_suspend() callback can be used to >>>>>> handle both the cases ? The distinction comes whether it is a >>>>> >>>>> How do you plan to handle that? Pass this info in some unused/reserved >>>>> bit of the "options" argument? Introduce a new parameter to the >>>>> func_suspend()? >>>>> >>>>> If that's the case, then you need to update the document on >>>>> func_suspend() to also support ClearFeature(suspend). Right now it's >>>>> documented for SetFeature only. Also, make sure that other existing >>>>> function drivers will not break because of the change of the >>>>> func_suspend behavior. >>>>> >>>>>> SetFeature(FUNCTION_SUSPEND) or ClearFeature(FUNCTION_SUSPEND) >>>>>> which can be >>>>>> easily done in the func_suspend callback itself. We can add >>>>>> another callback >>>>>> func_resume specific to ClearFeature(FUNCTION_SUSPEND) but wont >>>>>> that be >>>>>> redundant and more callback handling on function driver/composite >>>>>> side as >>>>>> well? Please let me know your opinion. >>>>>> >>>>> >>>>> We actually didn't properly define func_suspend and its counter >>>>> part. It >>>>> seems cleaner to me to introduce func_resume as it seems more >>>>> intuitive >>>>> and easier to read. Let me know how you plan to use func_suspend() for >>>>> both cases. >>>>> >>>> >>>> How about we handle function suspend resume in composite also? I mean >>>> something like this: >>>> >>>> diff --git a/drivers/usb/gadget/composite.c >>>> b/drivers/usb/gadget/composite.c >>>> index 36add1879ed2..79dc055eb5f7 100644 >>>> --- a/drivers/usb/gadget/composite.c >>>> +++ b/drivers/usb/gadget/composite.c >>>> @@ -1948,9 +1948,18 @@ composite_setup(struct usb_gadget *gadget, >>>> const struct usb_ctrlrequest *ctrl) >>>>            f = cdev->config->interface[intf]; >>>>            if (!f) >>>>                break; >>>> -        status = f->get_status ? f->get_status(f) : 0; >>>> -        if (status < 0) >>>> -            break; >>>> + >>>> +        if (f->get_status) { >>>> +            status = f->get_status(f); >>>> +            if (status < 0) >>>> +                break; >>>> +        } else { >>>> +            if (f->config->bmAttributes & USB_CONFIG_ATT_WAKEUP) { >>>> +                status |= USB_INTRF_STAT_FUNC_RW_CAP; >>>> +                if (f->func_wakeup_armed) >>>> +                    status |= USB_INTRF_STAT_FUNC_RW; >>>> +            } >>>> +        } >>>>            put_unaligned_le16(status & 0x0000ffff, req->buf); >>>>            break; >>>>        /* >>>> @@ -1971,9 +1980,28 @@ composite_setup(struct usb_gadget *gadget, >>>> const struct usb_ctrlrequest *ctrl) >>>>                f = cdev->config->interface[intf]; >>>>                if (!f) >>>>                    break; >>>> +            if (w_index & USB_INTRF_FUNC_SUSPEND_RW) { >>>> +                if (!(f->config->bmAttributes & >>>> USB_CONFIG_ATT_WAKEUP)) >>>> +                    break; >>>> + >>>> +                f->func_wakeup_armed = (ctrl->bRequest == >>>> USB_REQ_SET_FEATURE); >>>> +            } >>>> + >>>>                value = 0; >>>> -            if (f->func_suspend) >>>> +            if (f->func_suspend) { >>>>                    value = f->func_suspend(f, w_index >> 8); >>>> +            } else if (w_index & USB_INTRF_FUNC_SUSPEND_LP) { >>>> +                if (f->suspend && && !f->func_suspended && >>>> +                    ctrl->bRequest == USB_REQ_SET_FEATURE)) { >>>> +                    f->suspend(f); >>>> +                    f->func_suspended = true; >>>> +                } else if (f->resume && f->func_suspended && >>>> +                       ctrl->bRequest == >>>> USB_REQ_CLEAR_FEATURE_FEATURE)) { Linux based hosts, dont use ClearFeature(FUNCTION_SUSPEND) for function resume. They use SetFeature(FUNCTION_SUSPEND) itself but with Bit(0) i.e USB_INTRF_FUNC_SUSPEND_LP reset. So we may not be able to distinguish based on SET_FEATURE and CLEAR_FEATURE packets for function suspend and function resume. Instead we can generalize (w_index & USB_INTRF_FUNC_SUSPEND_LP) for function suspend and all other cases for function resume. if (f->func_suspend) { value = f->func_suspend(f, w_index >> 8); } else if (w_index & USB_INTRF_FUNC_SUSPEND_LP) { if (f->suspend && !f->func_suspended) { f->suspend(f); f->func_suspended = true; } } else { if (f->resume && f->func_suspended) { f->resume(f); f->func_suspended = false; } } Thanks Elson >>>> +                    f->resume(f); >>>> +                    f->func_suspended = false; >>>> +                } >>>> +            } >>>> + >>>>                if (value < 0) { >>>>                    ERROR(cdev, >>>>                          "func_suspend() returned error %d\n", >>>> >>> At individual function driver level there is no need to differentiate >>> between suspend() and func_suspend() APIs, as both are intended to >>> put the >>> function in suspend state. So your idea/implementation above makes it >>> much >>> more clearer. Let composite also handle this and call either >>> f->suspend() or >>> f->resume() callback based on the setup packet received. Thank you >>> for this >>> suggestion. >>> >>>> >>>> Also, do we need the f->func_suspended flag? we'd need the remote >>>> wakeup >>>> flag for the status, but when do we need f->func_suspended? It seems >>>> like it can be handled within the function driver's scope. >>> >>> f->func_suspended flag I had added for below purposes >>> >>> 1.) Function drivers should know the right wakeup() op to be called. >>> That is if they are in FUNC_SUSPEND then call usb_func_wakeup() and >>> if they >>> are in device suspend then call usb_gadget_wakeup(). (we can use >>> f->func_wakeup_armed flag for this purpose as well) >>> >>> 2.) If a function is in USB3 FUNCTION_SUSPEND state then it shouldn't >>> allow >>> f->resume() called through composite_resume() as the exit from >>> FUNCTION_SUSPEND state is via ClearFeature(FUNCTION_SUSPEND). >>> >>> So we need a way to tell function drivers if they are in USB3 >>> FUNCTION_SUSPEND state OR device suspend. >> >> Ok. So do you plan to update composite_resume to check that? Perhaps >> document this expected behavior also? >> > Yes I will update composite resume to handle this scenario. I was > handling it in f_ecm till now, but based on this new discussion I will > move all handling to composite layer. >>> >>> Please let me know if you see any alternative or better approach here. >>> >> >> If we have a use for it in composite.c, then it should be made >> available. Otherwise it should only exist in the function driver (ie. in >> f_ecm structure). >> > Yes I will keep it for now. Since we are moving all handling to > composite layer better to have some kind of flag that function > drivers/composite layer can use to check if a given function is in > FUNCTION_SUSPEND state or composite_suspend() state. > > Thanks > Elson >