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Tue, 09 Mar 2021 07:58:43 -0800 (PST) Subject: Re: [PATCH 07/11] PM / devfreq: check get_dev_status before start monitor To: Dong Aisheng , linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: dongas86@gmail.com, kernel@pengutronix.de, shawnguo@kernel.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, cw00.choi@samsung.com, abel.vesa@nxp.com References: <1615294733-22761-1-git-send-email-aisheng.dong@nxp.com> <1615294733-22761-8-git-send-email-aisheng.dong@nxp.com> From: Chanwoo Choi Message-ID: Date: Wed, 10 Mar 2021 00:58:37 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <1615294733-22761-8-git-send-email-aisheng.dong@nxp.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21. 3. 9. 오후 9:58, Dong Aisheng wrote: > The devfreq monitor depends on the device to provide load information > by .get_dev_status() to calculate the next target freq. > > And this will cause changing governor to simple ondemand fail > if device can't support. > > Signed-off-by: Dong Aisheng > --- > drivers/devfreq/devfreq.c | 10 +++++++--- > drivers/devfreq/governor.h | 2 +- > drivers/devfreq/governor_simpleondemand.c | 3 +-- > 3 files changed, 9 insertions(+), 6 deletions(-) > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index 7231fe6862a2..d1787b6c7d7c 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -482,10 +482,13 @@ static void devfreq_monitor(struct work_struct *work) > * to be called from governor in response to DEVFREQ_GOV_START > * event when device is added to devfreq framework. > */ > -void devfreq_monitor_start(struct devfreq *devfreq) > +int devfreq_monitor_start(struct devfreq *devfreq) > { > if (IS_SUPPORTED_FLAG(devfreq->governor->flags, IRQ_DRIVEN)) > - return; > + return 0; > + > + if (!devfreq->profile->get_dev_status) > + return -EINVAL; > > switch (devfreq->profile->timer) { > case DEVFREQ_TIMER_DEFERRABLE: > @@ -495,12 +498,13 @@ void devfreq_monitor_start(struct devfreq *devfreq) > INIT_DELAYED_WORK(&devfreq->work, devfreq_monitor); > break; > default: > - return; > + return -EINVAL; > } > > if (devfreq->profile->polling_ms) > queue_delayed_work(devfreq_wq, &devfreq->work, > msecs_to_jiffies(devfreq->profile->polling_ms)); > + return 0; > } > EXPORT_SYMBOL(devfreq_monitor_start); > > diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h > index 5cee3f64fe2b..31af6d072a10 100644 > --- a/drivers/devfreq/governor.h > +++ b/drivers/devfreq/governor.h > @@ -75,7 +75,7 @@ struct devfreq_governor { > unsigned int event, void *data); > }; > > -void devfreq_monitor_start(struct devfreq *devfreq); > +int devfreq_monitor_start(struct devfreq *devfreq); > void devfreq_monitor_stop(struct devfreq *devfreq); > void devfreq_monitor_suspend(struct devfreq *devfreq); > void devfreq_monitor_resume(struct devfreq *devfreq); > diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c > index d57b82a2b570..ea287b57cbf3 100644 > --- a/drivers/devfreq/governor_simpleondemand.c > +++ b/drivers/devfreq/governor_simpleondemand.c > @@ -89,8 +89,7 @@ static int devfreq_simple_ondemand_handler(struct devfreq *devfreq, > { > switch (event) { > case DEVFREQ_GOV_START: > - devfreq_monitor_start(devfreq); > - break; > + return devfreq_monitor_start(devfreq); > > case DEVFREQ_GOV_STOP: > devfreq_monitor_stop(devfreq); > Need to handle the all points of devfreq_monitor_start() usage. please check the tegra30-devfreq.c for this update. $ grep -rn "devfreq_monitor_start" drivers/ drivers/devfreq/governor_simpleondemand.c:92: devfreq_monitor_start(devfreq); drivers/devfreq/tegra30-devfreq.c:744: devfreq_monitor_start(devfreq); ...... -- Best Regards, Samsung Electronics Chanwoo Choi From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.2 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6871FC433DB for ; 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Tue, 09 Mar 2021 07:58:44 -0800 (PST) Received: from [172.30.1.19] ([14.32.163.5]) by smtp.gmail.com with ESMTPSA id q95sm3557419pjq.20.2021.03.09.07.58.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 09 Mar 2021 07:58:43 -0800 (PST) Subject: Re: [PATCH 07/11] PM / devfreq: check get_dev_status before start monitor To: Dong Aisheng , linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: dongas86@gmail.com, kernel@pengutronix.de, shawnguo@kernel.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, myungjoo.ham@samsung.com, kyungmin.park@samsung.com, cw00.choi@samsung.com, abel.vesa@nxp.com References: <1615294733-22761-1-git-send-email-aisheng.dong@nxp.com> <1615294733-22761-8-git-send-email-aisheng.dong@nxp.com> From: Chanwoo Choi Message-ID: Date: Wed, 10 Mar 2021 00:58:37 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: <1615294733-22761-8-git-send-email-aisheng.dong@nxp.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210309_155846_190397_8933A9E8 X-CRM114-Status: GOOD ( 23.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gMjEuIDMuIDkuIOyYpO2bhCA5OjU4LCBEb25nIEFpc2hlbmcgd3JvdGU6Cj4gVGhlIGRldmZy ZXEgbW9uaXRvciBkZXBlbmRzIG9uIHRoZSBkZXZpY2UgdG8gcHJvdmlkZSBsb2FkIGluZm9ybWF0 aW9uCj4gYnkgLmdldF9kZXZfc3RhdHVzKCkgdG8gY2FsY3VsYXRlIHRoZSBuZXh0IHRhcmdldCBm cmVxLgo+IAo+IEFuZCB0aGlzIHdpbGwgY2F1c2UgY2hhbmdpbmcgZ292ZXJub3IgdG8gc2ltcGxl IG9uZGVtYW5kIGZhaWwKPiBpZiBkZXZpY2UgY2FuJ3Qgc3VwcG9ydC4KPiAKPiBTaWduZWQtb2Zm LWJ5OiBEb25nIEFpc2hlbmcgPGFpc2hlbmcuZG9uZ0BueHAuY29tPgo+IC0tLQo+ICAgZHJpdmVy cy9kZXZmcmVxL2RldmZyZXEuYyAgICAgICAgICAgICAgICAgfCAxMCArKysrKysrLS0tCj4gICBk cml2ZXJzL2RldmZyZXEvZ292ZXJub3IuaCAgICAgICAgICAgICAgICB8ICAyICstCj4gICBkcml2 ZXJzL2RldmZyZXEvZ292ZXJub3Jfc2ltcGxlb25kZW1hbmQuYyB8ICAzICstLQo+ICAgMyBmaWxl cyBjaGFuZ2VkLCA5IGluc2VydGlvbnMoKyksIDYgZGVsZXRpb25zKC0pCj4gCj4gZGlmZiAtLWdp dCBhL2RyaXZlcnMvZGV2ZnJlcS9kZXZmcmVxLmMgYi9kcml2ZXJzL2RldmZyZXEvZGV2ZnJlcS5j Cj4gaW5kZXggNzIzMWZlNjg2MmEyLi5kMTc4N2I2YzdkN2MgMTAwNjQ0Cj4gLS0tIGEvZHJpdmVy cy9kZXZmcmVxL2RldmZyZXEuYwo+ICsrKyBiL2RyaXZlcnMvZGV2ZnJlcS9kZXZmcmVxLmMKPiBA QCAtNDgyLDEwICs0ODIsMTMgQEAgc3RhdGljIHZvaWQgZGV2ZnJlcV9tb25pdG9yKHN0cnVjdCB3 b3JrX3N0cnVjdCAqd29yaykKPiAgICAqIHRvIGJlIGNhbGxlZCBmcm9tIGdvdmVybm9yIGluIHJl c3BvbnNlIHRvIERFVkZSRVFfR09WX1NUQVJUCj4gICAgKiBldmVudCB3aGVuIGRldmljZSBpcyBh ZGRlZCB0byBkZXZmcmVxIGZyYW1ld29yay4KPiAgICAqLwo+IC12b2lkIGRldmZyZXFfbW9uaXRv cl9zdGFydChzdHJ1Y3QgZGV2ZnJlcSAqZGV2ZnJlcSkKPiAraW50IGRldmZyZXFfbW9uaXRvcl9z dGFydChzdHJ1Y3QgZGV2ZnJlcSAqZGV2ZnJlcSkKPiAgIHsKPiAgIAlpZiAoSVNfU1VQUE9SVEVE X0ZMQUcoZGV2ZnJlcS0+Z292ZXJub3ItPmZsYWdzLCBJUlFfRFJJVkVOKSkKPiAtCQlyZXR1cm47 Cj4gKwkJcmV0dXJuIDA7Cj4gKwo+ICsJaWYgKCFkZXZmcmVxLT5wcm9maWxlLT5nZXRfZGV2X3N0 YXR1cykKPiArCQlyZXR1cm4gLUVJTlZBTDsKPiAgIAo+ICAgCXN3aXRjaCAoZGV2ZnJlcS0+cHJv ZmlsZS0+dGltZXIpIHsKPiAgIAljYXNlIERFVkZSRVFfVElNRVJfREVGRVJSQUJMRToKPiBAQCAt NDk1LDEyICs0OTgsMTMgQEAgdm9pZCBkZXZmcmVxX21vbml0b3Jfc3RhcnQoc3RydWN0IGRldmZy ZXEgKmRldmZyZXEpCj4gICAJCUlOSVRfREVMQVlFRF9XT1JLKCZkZXZmcmVxLT53b3JrLCBkZXZm cmVxX21vbml0b3IpOwo+ICAgCQlicmVhazsKPiAgIAlkZWZhdWx0Ogo+IC0JCXJldHVybjsKPiAr CQlyZXR1cm4gLUVJTlZBTDsKPiAgIAl9Cj4gICAKPiAgIAlpZiAoZGV2ZnJlcS0+cHJvZmlsZS0+ cG9sbGluZ19tcykKPiAgIAkJcXVldWVfZGVsYXllZF93b3JrKGRldmZyZXFfd3EsICZkZXZmcmVx LT53b3JrLAo+ICAgCQkJbXNlY3NfdG9famlmZmllcyhkZXZmcmVxLT5wcm9maWxlLT5wb2xsaW5n X21zKSk7Cj4gKwlyZXR1cm4gMDsKPiAgIH0KPiAgIEVYUE9SVF9TWU1CT0woZGV2ZnJlcV9tb25p dG9yX3N0YXJ0KTsKPiAgIAo+IGRpZmYgLS1naXQgYS9kcml2ZXJzL2RldmZyZXEvZ292ZXJub3Iu aCBiL2RyaXZlcnMvZGV2ZnJlcS9nb3Zlcm5vci5oCj4gaW5kZXggNWNlZTNmNjRmZTJiLi4zMWFm NmQwNzJhMTAgMTAwNjQ0Cj4gLS0tIGEvZHJpdmVycy9kZXZmcmVxL2dvdmVybm9yLmgKPiArKysg Yi9kcml2ZXJzL2RldmZyZXEvZ292ZXJub3IuaAo+IEBAIC03NSw3ICs3NSw3IEBAIHN0cnVjdCBk ZXZmcmVxX2dvdmVybm9yIHsKPiAgIAkJCQl1bnNpZ25lZCBpbnQgZXZlbnQsIHZvaWQgKmRhdGEp Owo+ICAgfTsKPiAgIAo+IC12b2lkIGRldmZyZXFfbW9uaXRvcl9zdGFydChzdHJ1Y3QgZGV2ZnJl cSAqZGV2ZnJlcSk7Cj4gK2ludCBkZXZmcmVxX21vbml0b3Jfc3RhcnQoc3RydWN0IGRldmZyZXEg KmRldmZyZXEpOwo+ICAgdm9pZCBkZXZmcmVxX21vbml0b3Jfc3RvcChzdHJ1Y3QgZGV2ZnJlcSAq ZGV2ZnJlcSk7Cj4gICB2b2lkIGRldmZyZXFfbW9uaXRvcl9zdXNwZW5kKHN0cnVjdCBkZXZmcmVx ICpkZXZmcmVxKTsKPiAgIHZvaWQgZGV2ZnJlcV9tb25pdG9yX3Jlc3VtZShzdHJ1Y3QgZGV2ZnJl cSAqZGV2ZnJlcSk7Cj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvZGV2ZnJlcS9nb3Zlcm5vcl9zaW1w bGVvbmRlbWFuZC5jIGIvZHJpdmVycy9kZXZmcmVxL2dvdmVybm9yX3NpbXBsZW9uZGVtYW5kLmMK PiBpbmRleCBkNTdiODJhMmI1NzAuLmVhMjg3YjU3Y2JmMyAxMDA2NDQKPiAtLS0gYS9kcml2ZXJz L2RldmZyZXEvZ292ZXJub3Jfc2ltcGxlb25kZW1hbmQuYwo+ICsrKyBiL2RyaXZlcnMvZGV2ZnJl cS9nb3Zlcm5vcl9zaW1wbGVvbmRlbWFuZC5jCj4gQEAgLTg5LDggKzg5LDcgQEAgc3RhdGljIGlu dCBkZXZmcmVxX3NpbXBsZV9vbmRlbWFuZF9oYW5kbGVyKHN0cnVjdCBkZXZmcmVxICpkZXZmcmVx LAo+ICAgewo+ICAgCXN3aXRjaCAoZXZlbnQpIHsKPiAgIAljYXNlIERFVkZSRVFfR09WX1NUQVJU Ogo+IC0JCWRldmZyZXFfbW9uaXRvcl9zdGFydChkZXZmcmVxKTsKPiAtCQlicmVhazsKPiArCQly ZXR1cm4gZGV2ZnJlcV9tb25pdG9yX3N0YXJ0KGRldmZyZXEpOwo+ICAgCj4gICAJY2FzZSBERVZG UkVRX0dPVl9TVE9QOgo+ICAgCQlkZXZmcmVxX21vbml0b3Jfc3RvcChkZXZmcmVxKTsKPiAKCk5l ZWQgdG8gaGFuZGxlIHRoZSBhbGwgcG9pbnRzIG9mIGRldmZyZXFfbW9uaXRvcl9zdGFydCgpIHVz YWdlLgpwbGVhc2UgY2hlY2sgdGhlIHRlZ3JhMzAtZGV2ZnJlcS5jIGZvciB0aGlzIHVwZGF0ZS4K CiQgZ3JlcCAtcm4gImRldmZyZXFfbW9uaXRvcl9zdGFydCIgZHJpdmVycy8KZHJpdmVycy9kZXZm cmVxL2dvdmVybm9yX3NpbXBsZW9uZGVtYW5kLmM6OTI6IApkZXZmcmVxX21vbml0b3Jfc3RhcnQo ZGV2ZnJlcSk7CmRyaXZlcnMvZGV2ZnJlcS90ZWdyYTMwLWRldmZyZXEuYzo3NDQ6CQlkZXZmcmVx X21vbml0b3Jfc3RhcnQoZGV2ZnJlcSk7Ci4uLi4uLgoKLS0gCkJlc3QgUmVnYXJkcywKU2Ftc3Vu ZyBFbGVjdHJvbmljcwpDaGFud29vIENob2kKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFy bS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9t YWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK