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Thu, 24 Oct 2019 15:19:52 +0000 From: Ayan Halder To: Rob Herring CC: Mark Rutland , "devicetree@vger.kernel.org" , "m.szyprowski@samsung.com" , "dri-devel@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , Liviu Dudau , Mihail Atanassov , "james qian wang (Arm Technology China)" , Brian Starkey , nd Subject: Re: Question regarding "reserved-memory" Thread-Topic: Question regarding "reserved-memory" Thread-Index: AQHVinZwwZsw70agmEe040OUqUpTNqdp3/4AgAAICoA= Date: Thu, 24 Oct 2019 15:19:52 +0000 Message-ID: <20191024151951.GA29067@arm.com> References: <20191024142211.GA29467@arm.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: LO2P123CA0004.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:a6::16) To AM0PR08MB5345.eurprd08.prod.outlook.com (2603:10a6:208:18c::21) Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Ayan.Halder@arm.com; x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [217.140.106.53] x-ms-publictraffictype: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 115ac93a-19e1-4949-3e95-08d75895a35a X-MS-TrafficTypeDiagnostic: AM0PR08MB5137:|AM0PR08MB5137:|AM0PR08MB4596: x-ms-exchange-transport-forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true x-ms-oob-tlc-oobclassifiers: OLM:8882;OLM:8882; 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X-MS-Office365-Filtering-Correlation-Id-Prvs: 7052bbf4-1f77-4373-91ba-08d758959e19 NoDisclaimer: True X-Forefront-PRVS: 0200DDA8BE X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 5vKLxqUhbaysqC1kj3VsZz4BT/e3KkCqE0avITqwMZwKXAKDE2d+rZcwvEqjKAzSiJJCp0pIX3dDIIv7l/acoq1hHrRAGZckkxFXnSZud13MaqoM5QYr2xxcMFl3Sgq3TD3xNBiDUFaR+Iiqr/7h3TnkskV1E0qb2TW5pyi6igzvN3hzBTYkdjdoBGYfF72OHEA01NZ3IwAd4URCK7WRruNtgvg4vYY0paKv9AFltMnUVDTM+L/vVRS6CaDIQIcUindaoU8SQ6SI66NYjC7BYaZpq0/N9hVxQK6wPUorshomQt/5+KY7M4pzwHdlvi7gABGAutJyQk77uFzyukpC4yq+xzDV0kImSmn6ggZlqLVon/SRmKpk3veQJHaV5/jMhhrJ6Kl8QDmeq5u5UHlVfB2ftV9uffg0vam9Pftoy9E1O2HgXMgECV8byser51sv X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Oct 2019 15:20:00.8785 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 115ac93a-19e1-4949-3e95-08d75895a35a X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB4596 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Thu, Oct 24, 2019 at 09:51:04AM -0500, Rob Herring wrote: > On Thu, Oct 24, 2019 at 9:22 AM Ayan Halder wrote: Hi Bob, Thanks for your quick response. > > > > > > Hi Folks, > > > > I have a question regarding "reserved-memory". I am using an Arm Juno > > platform which has a chunk of ram in its fpga. I intend to make this > > memory as reserved so that it can be shared between various devices > > for passing framebuffer. > > > > My dts looks like the following:- > > > > / { > > .... // some nodes > > > > tlx@60000000 { > > compatible =3D "simple-bus"; > > ... > > > > juno_wrapper { > > > > ... /* here we have all the nodes */ > > /* corresponding to the devices in the fpga= */ > > > > memory@d000000 { > > device_type =3D "memory"; > > reg =3D <0x00 0x60000000 0x00 0x8000000>= ; > > }; > > > > reserved-memory { > > #address-cells =3D <0x01>; > > #size-cells =3D <0x01>; > > ranges; > > > > framebuffer@d000000 { > > compatible =3D "shared-dma-pool= "; > > linux,cma-default; > > reusable; > > reg =3D <0x00 0x60000000 0x00 0= x8000000>; > > phandle =3D <0x44>; > > }; > > }; > > ... > > } > > } > > ... > > } > > > > Note that the depth of the "reserved-memory" node is 3. > > > > Refer __fdt_scan_reserved_mem() :- > > > > if (!found && depth =3D=3D 1 && strcmp(uname, "reserved-memory"= ) =3D=3D 0) { > > > > if (__reserved_mem_check_root(node) !=3D 0) { > > pr_err("Reserved memory: unsupported node > > format, ignoring\n"); > > /* break scan */ > > return 1; > > } > > found =3D 1; > > > > /* scan next node */ > > return 0; > > } > > > > It expects the "reserved-memory" node to be at depth =3D=3D 1 and so it > > does not probe it in our case. > > > > Niether from the > > Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt > > nor from commit - e8d9d1f5485b52ec3c4d7af839e6914438f6c285, > > I could understand the reason for such restriction. > > > > So, I seek the community's advice as to whether I should fix up > > __fdt_scan_reserved_mem() so as to do away with the restriction or > > put the "reserved-memory" node outside of 'tlx@60000000' (which looks > > logically incorrect as the memory is on the fpga platform). >=20 > For now, I'm going to say it must be at the root level.=20 Can you mention it in the Documentation/.../reserved-memory.txt, please? > I'd guess the > memory@d000000 node is also just ignored (wrong unit-address BTW). I would request you to ignore the address for the time being. In juno_wrapper{}, we have a complex remapping of addresses of all the sub-devices. I deliberately did not put that in the snippet, so as to prevent any distraction from the core issue. >=20 > I think you're also forgetting the later unflattened parsing of > /reserved-memory. Are you talking about the remaining part of the __fdt_scan_reserved_mem() ie .... } else if (found && depth < 2) { /* scanning of /reserved-memory has been finished */ return 1; } if (!of_fdt_device_is_available(initial_boot_params, node)) return 0; err =3D __reserved_mem_reserve_reg(node, uname); if (err =3D=3D -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) fdt_reserved_mem_save_node(node, uname, 0, 0); /* scan next node */ return 0; If so, I agree with you that it needs to be changed as well (if we were to do away with the restriction). > The other complication IIRC is booting with UEFI > does it's own reserved memory table which often uses the DT table as > its source. I have no knowledge of UEFI booting. So if UEFI expects "reserved-memory" nodes to be at root level, then we must adhere to the restriction. :) Ayan >=20 > Rob From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ayan Halder Subject: Re: Question regarding "reserved-memory" Date: Thu, 24 Oct 2019 15:19:52 +0000 Message-ID: <20191024151951.GA29067@arm.com> References: <20191024142211.GA29467@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from EUR02-VE1-obe.outbound.protection.outlook.com (mail-eopbgr20040.outbound.protection.outlook.com [40.107.2.40]) by gabe.freedesktop.org (Postfix) with ESMTPS id 71A556E446 for ; Thu, 24 Oct 2019 15:20:04 +0000 (UTC) In-Reply-To: Content-Language: en-US Content-ID: <47D9427BD490E34687050EE8A7647BE1@eurprd08.prod.outlook.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Rob Herring Cc: Mark Rutland , "devicetree@vger.kernel.org" nd , Liviu Dudau , "linux-kernel@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , "james qian wang (Arm Technology China)" , Mihail Atanassov , "m.szyprowski@samsung.com" List-Id: dri-devel@lists.freedesktop.org T24gVGh1LCBPY3QgMjQsIDIwMTkgYXQgMDk6NTE6MDRBTSAtMDUwMCwgUm9iIEhlcnJpbmcgd3Jv dGU6Cj4gT24gVGh1LCBPY3QgMjQsIDIwMTkgYXQgOToyMiBBTSBBeWFuIEhhbGRlciA8QXlhbi5I YWxkZXJAYXJtLmNvbT4gd3JvdGU6CkhpIEJvYiwKClRoYW5rcyBmb3IgeW91ciBxdWljayByZXNw b25zZS4KPiA+Cj4gPgo+ID4gSGkgRm9sa3MsCj4gPgo+ID4gSSBoYXZlIGEgcXVlc3Rpb24gcmVn YXJkaW5nICJyZXNlcnZlZC1tZW1vcnkiLiBJIGFtIHVzaW5nIGFuIEFybSBKdW5vCj4gPiBwbGF0 Zm9ybSB3aGljaCBoYXMgYSBjaHVuayBvZiByYW0gaW4gaXRzIGZwZ2EuIEkgaW50ZW5kIHRvIG1h a2UgdGhpcwo+ID4gbWVtb3J5IGFzIHJlc2VydmVkIHNvIHRoYXQgaXQgY2FuIGJlIHNoYXJlZCBi ZXR3ZWVuIHZhcmlvdXMgZGV2aWNlcwo+ID4gZm9yIHBhc3NpbmcgZnJhbWVidWZmZXIuCj4gPgo+ ID4gTXkgZHRzIGxvb2tzIGxpa2UgdGhlIGZvbGxvd2luZzotCj4gPgo+ID4gLyB7Cj4gPiAgICAg 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