From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Gautam Subject: Re: [PATCH v16 2/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Date: Tue, 25 Sep 2018 11:26:04 +0530 Message-ID: References: <20180830144541.17740-1-vivek.gautam@codeaurora.org> <20180830144541.17740-3-vivek.gautam@codeaurora.org> <3ccc3690-dc9d-56e7-e2d1-62e73a189bff@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: freedreno-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Freedreno" To: Robin Murphy , Will Deacon Cc: Mark Rutland , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , Linux PM , sboyd-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-arm-msm , "Rafael J. Wysocki" , open list , "list-Y9sIeH5OGRo@public.gmane.org:IOMMU DRIVERS , Joerg Roedel , " , Tomasz Figa , alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, robh+dt , freedreno List-Id: linux-arm-msm@vger.kernel.org SGkgUm9iaW4sIFdpbGwsCgpPbiBUdWUsIFNlcCAxOCwgMjAxOCBhdCA4OjQxIEFNIFZpdmVrIEdh dXRhbQo8dml2ZWsuZ2F1dGFtQGNvZGVhdXJvcmEub3JnPiB3cm90ZToKPgo+IEhpIFJvYmluLAo+ Cj4gT24gRnJpLCBTZXAgNywgMjAxOCBhdCAzOjUyIFBNIFZpdmVrIEdhdXRhbSA8dml2ZWsuZ2F1 dGFtQGNvZGVhdXJvcmEub3JnPiB3cm90ZToKPiA+Cj4gPiBPbiBGcmksIFNlcCA3LCAyMDE4IGF0 IDM6MjIgUE0gVG9tYXN6IEZpZ2EgPHRmaWdhQGNocm9taXVtLm9yZz4gd3JvdGU6Cj4gPiA+Cj4g PiA+IE9uIEZyaSwgU2VwIDcsIDIwMTggYXQgNjozOCBQTSBWaXZlayBHYXV0YW0gPHZpdmVrLmdh dXRhbUBjb2RlYXVyb3JhLm9yZz4gd3JvdGU6Cj4gPiA+ID4KPiA+ID4gPiBIaSBUb21hc3osCj4g PiA+ID4KPiA+ID4gPgo+ID4gPiA+IE9uIDkvNy8yMDE4IDI6NDYgUE0sIFRvbWFzeiBGaWdhIHdy b3RlOgo+ID4gPiA+ID4gSGkgVml2ZWssCj4gPiA+ID4gPgo+ID4gPiA+ID4gT24gVGh1LCBBdWcg MzAsIDIwMTggYXQgMTE6NDYgUE0gVml2ZWsgR2F1dGFtCj4gPiA+ID4gPiA8dml2ZWsuZ2F1dGFt 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-0700 (PDT) X-Gm-Message-State: ABuFfoixEvF2zwFz8/c8BGBUTO5sVHjib+lROKhP+ar4Y8GayrHAUZFA zDSeCcsNlc12ciM71N29AQ3DLSeStdPzMlj8oEA= X-Google-Smtp-Source: ACcGV622tsRI3Uys7O+mzkxrdqxW9eaXn3zif7m+Lo5AedQETIuZN+4dIIQ5jn0etrtL1YVcL26Z+9Z3UATYEl9TKeE= X-Received: by 2002:a37:c44c:: with SMTP id h12-v6mr1486652qkm.279.1537854977014; Mon, 24 Sep 2018 22:56:17 -0700 (PDT) MIME-Version: 1.0 References: <20180830144541.17740-1-vivek.gautam@codeaurora.org> <20180830144541.17740-3-vivek.gautam@codeaurora.org> <3ccc3690-dc9d-56e7-e2d1-62e73a189bff@codeaurora.org> In-Reply-To: From: Vivek Gautam Date: Tue, 25 Sep 2018 11:26:04 +0530 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v16 2/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device To: Robin Murphy , Will Deacon Cc: Mark Rutland , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , alex.williamson@redhat.com, Linux PM , sboyd@kernel.org, "Rafael J. Wysocki" , open list , "list@263.net:IOMMU DRIVERS , Joerg Roedel ," , "robh+dt" , linux-arm-msm , freedreno , Tomasz Figa Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Robin, Will, On Tue, Sep 18, 2018 at 8:41 AM Vivek Gautam wrote: > > Hi Robin, > > On Fri, Sep 7, 2018 at 3:52 PM Vivek Gautam wrote: > > > > On Fri, Sep 7, 2018 at 3:22 PM Tomasz Figa wrote: > > > > > > On Fri, Sep 7, 2018 at 6:38 PM Vivek Gautam wrote: > > > > > > > > Hi Tomasz, > > > > > > > > > > > > On 9/7/2018 2:46 PM, Tomasz Figa wrote: > > > > > Hi Vivek, > > > > > > > > > > On Thu, Aug 30, 2018 at 11:46 PM Vivek Gautam > > > > > wrote: > > > > >> From: Sricharan R > > > > >> > > > > >> The smmu device probe/remove and add/remove master device callbacks > > > > >> gets called when the smmu is not linked to its master, that is without > > > > >> the context of the master device. So calling runtime apis in those places > > > > >> separately. > > > > >> Global locks are also initialized before enabling runtime pm as the > > > > >> runtime_resume() calls device_reset() which does tlb_sync_global() > > > > >> that ultimately requires locks to be initialized. > > > > >> > > > > >> Signed-off-by: Sricharan R > > > > >> [vivek: Cleanup pm runtime calls] > > > > >> Signed-off-by: Vivek Gautam > > > > >> Reviewed-by: Tomasz Figa > > > > >> Tested-by: Srinivas Kandagatla > > > > >> --- > > > > >> drivers/iommu/arm-smmu.c | 89 +++++++++++++++++++++++++++++++++++++++++++----- > > > > >> 1 file changed, 81 insertions(+), 8 deletions(-) > > > > > [snip] > > > > >> @@ -2215,10 +2281,17 @@ static int arm_smmu_device_remove(struct platform_device *pdev) > > > > >> if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS)) > > > > >> dev_err(&pdev->dev, "removing device with active domains!\n"); > > > > >> > > > > >> + arm_smmu_rpm_get(smmu); > > > > >> /* Turn the thing off */ > > > > >> writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0); > > > > >> + arm_smmu_rpm_put(smmu); > > > > >> + > > > > >> + if (pm_runtime_enabled(smmu->dev)) > > > > >> + pm_runtime_force_suspend(smmu->dev); > > > > >> + else > > > > >> + clk_bulk_disable(smmu->num_clks, smmu->clks); > > > > >> > > > > >> - clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks); > > > > >> + clk_bulk_unprepare(smmu->num_clks, smmu->clks); > > > > > Aren't we missing pm_runtime_disable() here? We'll have the enable > > > > > count unbalanced if the driver is removed and probed again. > > > > > > > > pm_runtime_force_suspend() does a pm_runtime_disable() also if i am not > > > > wrong. > > > > And, as mentioned in a previous thread [1], we were seeing a warning > > > > which we avoided > > > > by keeping force_suspend(). > > > > > > > > [1] https://lkml.org/lkml/2018/7/8/124 > > > > > > I see, thanks. I didn't realize that pm_runtime_force_suspend() > > > already disables runtime PM indeed. Sorry for the noise. > > > > Hi Tomasz, > > No problem. Thanks for looking back at it. > > > > Hi Robin, > > If you are fine with this series, then can you please consider giving > > Reviewed-by, so that we are certain that this series will go in the next merge > > window. > > Thanks > > Gentle ping. > You ack will be very helpful in letting Will pull this series for 4.20. > Thanks. I would really appreciate if you could provide your ack for this series. Or if there are any concerns, I am willing to address them. Thanks. Best regards Vivek > > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation