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Mooring" , Stefano Stabellini , Michal Simek , "devicetree@vger.kernel.org" , "michael.auchter@ni.com" , "mathieu.poirier@linaro.org" , "linux-kernel@vger.kernel.org" , Rob Herring , "linux-arm-kernel@lists.infradead.org" Subject: RE: RE: RE: [PATCH v18 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver Thread-Topic: RE: RE: [PATCH v18 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver Thread-Index: AQHWmzGLZdXOwIwjxE6bV2X+UlYToKmJZsqAgAGMKFCAACbWgIAAAZmggAAMCYCADeKZ4A== Date: Thu, 15 Oct 2020 18:31:20 +0000 Message-ID: References: <20201005160614.3749-1-ben.levinsky@xilinx.com> <20201005160614.3749-6-ben.levinsky@xilinx.com> <20201005193449.GA701433@xaphan> <20201006213143.GD701433@xaphan> <20201006222031.GA809209@xaphan> In-Reply-To: <20201006222031.GA809209@xaphan> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-TNEF-Correlator: authentication-results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=xilinx.com; x-originating-ip: [149.199.62.133] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: de157a34-4a40-47ae-c7fb-08d871388393 x-ms-traffictypediagnostic: BY5PR02MB6420: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: I1TWjhW+62in+FO6J9xp5GyHCOnmG/Zt8CogH3q5N7IZeY9nwTKKBiJEhQeLpmlTYzLAWRSVObBgKydbp9oaVKmYFW8u1WqeLB2XxShfw0gKyrO87YmODAu256EZUUKrtbwx1mGFSCcLRZlaxeq+Xc7+x77jRIRwDKV7FDddagyyA72GMiiE/0wE3iBiG9g7Ss3sDbedo+FhAKbCXqFHnBgf+YAh1+i6qExZkJntUifw+G3wJ/MD0V39wuGnwPh8GXyeUJyQ2fSe/6mEwDHeuss+3YeChvr0EUnysBweNZI4/XMbgQl2PER/5f4/c7GbWraq4UgDLD6otguZfOJlKg== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR02MB4407.namprd02.prod.outlook.com;PTR:;CAT:NONE;SFS:(346002)(136003)(39860400002)(366004)(376002)(396003)(4326008)(9686003)(478600001)(2906002)(7696005)(86362001)(8676002)(186003)(26005)(54906003)(53546011)(6506007)(76116006)(8936002)(64756008)(316002)(66476007)(66556008)(66946007)(66446008)(83380400001)(52536014)(5660300002)(33656002)(55016002)(71200400001)(6916009);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR02MB4407.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: de157a34-4a40-47ae-c7fb-08d871388393 X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Oct 2020 18:31:21.0044 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9M+XqgW7tPzgBGMxzFhG5jG/fZDIWaQbo+Zg+DTVnEhpQW5JuV6Zf3pb0AKfxwEU2t14z5Ndl2RJ5+qYYKy9MA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR02MB6420 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi All, > -----Original Message----- > From: Michael Auchter > Sent: Tuesday, October 6, 2020 3:21 PM > To: Ben Levinsky > Cc: Ed T. Mooring ; Stefano Stabellini > ; Michal Simek ; > devicetree@vger.kernel.org; mathieu.poirier@linaro.org; linux- > remoteproc@vger.kernel.org; linux-kernel@vger.kernel.org; > robh+dt@kernel.org; linux-arm-kernel@lists.infradead.org > Subject: Re: RE: RE: [PATCH v18 5/5] remoteproc: Add initial zynqmp R5 > remoteproc driver >=20 > On Tue, Oct 06, 2020 at 09:46:38PM +0000, Ben Levinsky wrote: > > > > > > > -----Original Message----- > > > From: Michael Auchter > > > Sent: Tuesday, October 6, 2020 2:32 PM > > > To: Ben Levinsky > > > Cc: Ed T. Mooring ; sunnyliangjy@gmail.com; > > > punit1.agrawal@toshiba.co.jp; Stefano Stabellini ; > > > Michal Simek ; devicetree@vger.kernel.org; > > > mathieu.poirier@linaro.org; linux-remoteproc@vger.kernel.org; linux- > > > kernel@vger.kernel.org; robh+dt@kernel.org; linux-arm- > > > kernel@lists.infradead.org > > > Subject: Re: RE: [PATCH v18 5/5] remoteproc: Add initial zynqmp R5 > > > remoteproc driver > > > > > > On Tue, Oct 06, 2020 at 07:15:49PM +0000, Ben Levinsky wrote: > > > > > > > > Hi Michael, > > > > > > > > Thanks for the review > > > > > > > > > > < ... snip ... > > > > > > > > > > + z_rproc =3D rproc->priv; > > > > > > + z_rproc->dev.release =3D zynqmp_r5_release; > > > > > > > > > > This is the only field of z_rproc->dev that's actually initialize= d, and > > > > > this device is not registered with the core at all, so zynqmp_r5_= release > > > > > will never be called. > > > > > > > > > > Since it doesn't look like there's a need to create this addition= al > > > > > device, I'd suggest: > > > > > - Dropping the struct device from struct zynqmp_r5_rproc > > > > > - Performing the necessary cleanup in the driver remove > > > > > callback instead of trying to tie it to device release > > > > > > > > For the most part I agree. I believe the device is still needed for > > > > the mailbox client setup. > > > > > > > > As the call to mbox_request_channel_byname() requires its own devic= e > > > > that has the corresponding child node with the corresponding > > > > mbox-related properties. > > > > > > > > With that in mind, is it still ok to keep the device node? > > > > > > Ah, I see. Thanks for the clarification! > > > > > > Instead of manually dealing with the device node creation for the > > > individual processors, perhaps it makes more sense to use > > > devm_of_platform_populate() to create them. This is also consistent w= ith > > > the way the TI K3 R5F remoteproc driver does things. > > > > > > Cheers, > > > Michael > > > > I've been working on this today for a way around it and found one that = I > think works with your initial suggestion, > > - in z_rproc, change dev from struct device to struct device* > > ^ the above is shown the usage thereof below. It is there for the > mailbox setup. > > - in driver probe: > > - add list_head to keep track of each core's z_rproc and for the drive= r > remove clean up > > - in each core's probe (zynqmp_r5_probe) dothe following: > > > > > > rproc_ptr =3D rproc_alloc(dev, dev_name(dev), &zynqmp_r5_rproc_o= ps, > > NULL, sizeof(struct z= ynqmp_r5_rproc)); > > if (!rproc_ptr) > > return -ENOMEM; > > z_rproc =3D rproc_ptr->priv; > > z_rproc->dt_node =3D node; > > z_rproc->rproc =3D rproc_ptr; > > z_rproc->dev =3D &rproc_ptr->dev; > > z_rproc->dev->of_node =3D node; > > where node is the specific R5 core's of_node/ Device tree node. > > > > the above preserves most of the mailbox setup code. >=20 > I see how this works, but it feels a bit weird to me to be overriding > the remoteproc dev's of_node ptr. Personally I find the > devm_of_platform_populate() approach a bit less confusing. >=20 > But, it's also not my call to make ;). Perhaps a remoteproc maintainer > can chime in here. >=20 > > Ping for comments here. I looked at the TI R5 remoteproc driver and from what I can see, it seems t= he crux of the line:=20 z_rproc->dev->of_node =3D node;=20 is as follows: the TI driver only has 1 R5-related remoteproc node. But in this it has inf= ormation for both cores so the rproc_alloc's device that is passed in is sufficient for subsequent mai= lbox calls. This is because the device here also has a device_node that has the mbox information. The Xilinx driver differs in that while there is a cluster device tree node= that has the remoteproc-related Information, it ALSO has child R5 cores that have their own TCM bank and mb= ox information.=20 As a result of this difference the use of devm_of_populate would not remove= the use of the line of code in question because the mailbox setup calls la= ter on still require the device field to have a corresponding device tree n= ode that Has the mailbox information. If it is desired to see the use of devm_of_populate and more close alignmen= t to the TI driver that has been merged then the Xilinx R5 driver bindings = can instead have the TCM bank info, memory-regions, meta-memory-regions int= o R5 core-specific lists which resembles how the TI R5 driver has R5 core-s= pecific properties. At this point just trying to suss out some direction in= this patch series. Your feedback and review is much appreciated, Ben > > > > With this, I have already successfully done the following in a v19 patc= h > > - move all the previous driver release code to remove > > - able to probe, start/stop r5, driver remove repeatedly > > > > Also, this mimics the TI R5 driver code as each core's rproc has a list= _head > and they have a structure for the cluster which among other things mainta= ins > a linked list of the cores' specific rproc information. > > > > Thanks > > Ben