From nobody Mon Feb 9 21:19:46 2026 Received: from TY3P286CU002.outbound.protection.outlook.com (mail-japaneastazon11020123.outbound.protection.outlook.com [52.101.229.123]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DCDA4218A0; Wed, 4 Feb 2026 14:54:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.229.123 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770216894; cv=fail; b=bVC9IgDAOJWtJbTSBH5WNy3JQWYkSdjIetnliTva8hah+PnaAI0n5O5rwy6HaHup6NygsvWVvfuvtmfYvqr9CodUZi7tnbvVNK9PY/R8kQbdNmFB5cDNHXCU6GAVce20TLYCokVteZjFaTAL3zx+8rLMPgVKqVnqMtNgDhX8v6w= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770216894; c=relaxed/simple; bh=hOb8BJF52xzC1qdBJ4+aCRZSGjiYxYSwt19mniN9Ihw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=u7ct7G7QmEl/J69Oq5NRs5o0fM5y76flwskqLB9Nja88pXcCpypeE7vND78YicSCISu3OIpxuJYFAbxTM+2uznKahTTIt12MnJjG8TUQn/DZ1d9u2Y69IYtp0uXZmv3UNETnIGr9QfqTCINPt7MJcs2j+eoL4Durd9cAQ5KGqp8= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=valinux.co.jp; spf=pass smtp.mailfrom=valinux.co.jp; dkim=pass (1024-bit key) header.d=valinux.co.jp header.i=@valinux.co.jp header.b=X00y5OtB; arc=fail smtp.client-ip=52.101.229.123 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=valinux.co.jp Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=valinux.co.jp Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=valinux.co.jp header.i=@valinux.co.jp header.b="X00y5OtB" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=o43UG0gIsr5azsn/lFpW2RnqXhIeWtmXoI3HOO6XwnpNG5ieu8kVcAwWPaatg+OhF7cXLXxLZcgQyHSdigQOVAXy2KGWTO3AWQLEeFjWm34JbMxAOPjxSDhh2YPFkYBJTlc41n1KmqRp82TBwA4wsJYeHAQAyyaKEYUIZNjdABt1F1VVAGc2BWmVqHC9VjEH5+pLUGsTKErfsQrPYZVeWMQoYrLbv/wUZLg4hm7zD/4/Cu1jfxsEBIuHXL+3+sDpVVyzgVvH5hkbdJDk6GcOHLWzDqt5oyp/eozcsrYBT+QTP5c5HUHdTIv4ghkLJnKtGe2VtzWlXyhKk/7wLr6Eiw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=eKdfx5WovNaRG96pDAjpKh03Wudln7z6ky0A68WDJD4=; b=dvMYRJri3NZFOl37i2QgowADG7c0BOsTnFb+mUFcbhJwt+WvB6O5KpJYEVyHTEK8E2/KLpJ8+DPqK4e8O++B07ymHWv2i77zv5Qu9juegAT4/2Hzvj06KsGqAEnZ8+m50O+DRBL/s4OC3WGlfbZSUj3OQPWHlGaWfFGj9ZcUOg3PnXlFPikrDa90sAR1VcE25g88LEafZfqVfAm2R3s6zhw1wXy4Gtc2nTu9gzXhrd8ElQkenyU5hzqC9srfxyPWUeO53IyTyaH6kn1QuQMj8QUcq/8PBlDFaDxOnWgDSTSZDazmunSZ3/3k0OU6KP5Ew5yl5ltM632Ej/Mhs6fMUg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=valinux.co.jp; dmarc=pass action=none header.from=valinux.co.jp; dkim=pass header.d=valinux.co.jp; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=valinux.co.jp; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=eKdfx5WovNaRG96pDAjpKh03Wudln7z6ky0A68WDJD4=; b=X00y5OtB8ystuttCWBx0M5F0VMz+hXxwvunZf46uBsbqEnsZvXl1MGLFYlBUgMcFjaHmW77PloWTS/ldX0ovtB2G+9JWU/3tPnByantj2lFQ2YEcFRkAGmrCfpfYQ7CWR45lxt65DSA/YV3mnEYKKd0XEo8qaED0rNebf3SpR10= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=valinux.co.jp; Received: from TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM (2603:1096:405:38f::10) by TYCP286MB2976.JPNP286.PROD.OUTLOOK.COM (2603:1096:400:302::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9587.12; Wed, 4 Feb 2026 14:54:53 +0000 Received: from TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM ([fe80::2305:327c:28ec:9b32]) by TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM ([fe80::2305:327c:28ec:9b32%5]) with mapi id 15.20.9587.010; Wed, 4 Feb 2026 14:54:53 +0000 From: Koichiro Den To: vkoul@kernel.org, mani@kernel.org, Frank.Li@nxp.com, jingoohan1@gmail.com, lpieralisi@kernel.org, kwilczynski@kernel.org, robh@kernel.org, bhelgaas@google.com Cc: dmaengine@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 08/11] PCI: dwc: ep: Report integrated DWC eDMA remote resources Date: Wed, 4 Feb 2026 23:54:36 +0900 Message-ID: <20260204145440.950609-9-den@valinux.co.jp> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260204145440.950609-1-den@valinux.co.jp> References: <20260204145440.950609-1-den@valinux.co.jp> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: TYCP286CA0025.JPNP286.PROD.OUTLOOK.COM (2603:1096:400:263::16) To TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM (2603:1096:405:38f::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: TY7P286MB7722:EE_|TYCP286MB2976:EE_ X-MS-Office365-Filtering-Correlation-Id: bf807f9e-ba65-4ec6-96a1-08de63fd5ad0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|10070799003|7416014|376014|366016; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?CGAHa5HkiXCci7FwOT78Y9RYUHvPycnWUVmzUJbxFXpQ+uHFWU0GJmyPziYG?= =?us-ascii?Q?+H9QFVWiHT2ZlZhIKujyNsLkAjxPd9MQynlTdCMRBF+rlYbbU/ZZyHJ0TMg3?= =?us-ascii?Q?rhVRgE99ETzRQjuwZoYta2fxwMdn2E4eJkhOMSBAq6p593hadAHFtx7FioGy?= =?us-ascii?Q?lWBCysbp0p15mPiKxG8yicZqw03Vs/yTGnhjwbd3rQC6nXnmfKGA6F8MTYjs?= =?us-ascii?Q?TR+OF5FanyXjFYaK+ZhX+CwmLOw3kgYUqar2PzJP6znKTItr7ZGN9ZWThrBU?= =?us-ascii?Q?HghDdbOpQ51FpfAH7jMqm26nJug/IU5ACOctHB0ZWMONpjkVmfKeBcJ2M54O?= =?us-ascii?Q?pcqaXGxHpzNx2EihhISl0YG4HBL9j6F0jH/OEq7OGdS9ixF28DdjezLlRAJa?= =?us-ascii?Q?mP5LNVvQfHzCaudiOUe/QOaXgHvlKEFCR5HVoN46vko8J2Fcn5CegTIWoQcN?= =?us-ascii?Q?YUT3jQ0NKd/7en8uilmCpuiWVNzkrYllMjPUgF76iR9ONHcXleKy9NK9a7Z8?= =?us-ascii?Q?AUrXCpU2eTWgVnLfMrdgqWBSr0askSgX/D1XJhw6yEuY8TjAH5YzP90Mz5MI?= =?us-ascii?Q?/eN84JIkxJkCu7ti4btK7uvNUNjZuyNUjhSx9QLcP9u5LB9iEDWF0mfIp7LE?= =?us-ascii?Q?uzcB7eQ/UGMdZ9E74J0pC/en311+r7amKifXSLHESRXZpH1+V+n7nwoBJaSM?= =?us-ascii?Q?xNbTZqGwHoP2QtJtCUR1E/rE7VWfpJfSCjmbCHjqbv9vcOhC+9OyHyhGiTDd?= =?us-ascii?Q?Mv3EMCeW0wLC+bTh4odu1UA3za3qh5YD41ggnPFM8Gfq3+Mz9kGR0ft+xu0s?= =?us-ascii?Q?v/8jVlRchOE87dvWqZE5P0kqXyHb9lqxTq7PQviM32B+OHUDujkvPM35VqR7?= =?us-ascii?Q?3cErpTb/ZTW9ACY5hZbiuIFNDn3bdGy5t5ZCXe0+IuVk8CcFckLbroOqkTzS?= =?us-ascii?Q?o4xh4YInMZ/iRGihcD14MVcSNiz5am90q1pGZFfLkB7+U3sZ/RZIqPKbaI5G?= =?us-ascii?Q?spAcq1C5biOGW9X9HbR71uIYlZPzv3ed09623yeFaUQ1rIiUoPdM+rXZfOxr?= =?us-ascii?Q?H4b0cuSN8DegyR5npOz/sS5zguZqVSY6Fa+rb/IurVRxtWxLxkDMVpb+0Dvf?= =?us-ascii?Q?NeoFXm/PINA+O5URKQV71C72zncUZhqfI3a0WpKFl1X5zDtM1OKaqp2CkkJW?= =?us-ascii?Q?kKGPanePb0griygMc0KMlwuS1RN3NuFGdZL/G6WVKPssovl9sh9qC3RWoatN?= =?us-ascii?Q?HhV3TLVXDoTec6hhVOtSqmDe7cwyVj5v++Nc2iiNXcn6l19Nm1aYeikEvHwX?= =?us-ascii?Q?f42NymJaLgeBRE6r6LAcyYGlcyjfT8Y75S528WmCSi9IZO4VafG17jdVL59l?= =?us-ascii?Q?ciZ3Oc19RyvsoLTLoqT7GohmtESvkOyiok0wXP4Bt25UUeIl4pbVFzEN3v3C?= =?us-ascii?Q?d5nbWOdaSOhp/etJhLZ/ZW/oLGlHxr48zYiJZxRjI8zhNAdR472ZlaSL33O0?= =?us-ascii?Q?JK7+C3l2F4iZL+xur5tQcX0z3ws9GxDg+r4nMbvDZUluI5MN35/cBJXFPJnr?= =?us-ascii?Q?Emcx+lW8B/Y+2VdIz1s=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(10070799003)(7416014)(376014)(366016);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?4gaqxCxnzvx+uKS+qlIFhboElvvtcNRMXJkL7b/yc1LLWgOfIDaZSpHDRyRv?= =?us-ascii?Q?hyxlto1L7YGmVHrPwBsHt7Tqu5bf32Bq2WBe40pcgKA7o35ceZRdj4sqoO6N?= =?us-ascii?Q?ESd75TmRx8wuvu0bJDjGVdsdlWeINSA2PTng7V6R+pNW88AyUHC1GtFMGxL5?= =?us-ascii?Q?/Pr1RYCoL68nGaKgGwrO9EoW3q1z/TCEWDx3esjjjhFnbvkF72EJWlRKP3fm?= =?us-ascii?Q?php4AX+nmCJ9AoORMvrH8iUPiTpcPoE1c79Z1Z+5wS08X2TMlaWuzdz4n8Rj?= =?us-ascii?Q?9O9fAjc4TGmfSyDSV8NH3u6Ij+EDFZbVp1O00cUqz9Q1JKTxI5ePCziT4MTQ?= =?us-ascii?Q?7WkRbm0rouOPE69TfXSFY8p7KLHjB3Ym8OPqNSJyFuejm7CB/1/1ntSyt7/q?= =?us-ascii?Q?lBssKMPvs20tXSQTyBdohDs74GHd5wXSXJ2XIsmNQVLANlHMiZNHbUv9Tu34?= =?us-ascii?Q?DDYkPj88hBhLAwsGTXxD/6vJIqVq+IUiD/Z6aHjLZyhM4Hu+zsrm84oSzJwM?= =?us-ascii?Q?Y+JnT/40NHnlNHvjeh6ctdjwQ/5sMV4zGy/KI8DjTV/XjenZYE123Iw7ho/s?= =?us-ascii?Q?15efnAgOQzKBAMziOzseT2t0L3uB2I5GQ+XP9XHNZ8CU+4XkAgTEUzPWDDUT?= =?us-ascii?Q?KamS2KGLGLWHz70PehIhasjxLCMcTbIRK9aAzKicOJEJM6a3cKHV48qrlipU?= =?us-ascii?Q?TSo7kjB/PlZqVsRSZhKNIpdhuKAuBaE2kBbi7I5rNiqMh1zVAE3MWH5ENzeW?= =?us-ascii?Q?rA43Fzsn63Knjo3TsErfmCoKsw7muBT7mgN2pwvisZ+ezgwnjH9ZlqpQEF28?= =?us-ascii?Q?/XIlRXE8tCxMkB/44alBzUY70G0r3U7Mac79GLsLR5ljjWGX2FKlPashydXM?= =?us-ascii?Q?XF2d6JpQaCWeo0s2UYZAXqHCXVfqRCo9hJBg8AxDc4/LwD9Iz9KlqiGP6lBE?= =?us-ascii?Q?2sXAoqyngEC+p6FW17MixS6S5wl92hD2swzCaTtKWN49kzP5EWypplT+vbp5?= =?us-ascii?Q?oGtj1DO5wzyPu4sUL3NM/xqc2r1wb1Sp5E1ERJjeF5yv/8Tt0iIwWFwuYcgn?= =?us-ascii?Q?yog6xlPo21jhuGReObnayX1UK1TK0o0dqfhgu6d7DbEEBl77pRkou8S8iGgo?= =?us-ascii?Q?vGreuE5Wf5qRtOQTfocxwwjykYxD176UJE1Ds252XIGJaStYlBvDlU5CtfcC?= =?us-ascii?Q?dbQoJA9tjBF8vhfpVHd7zdA1dDmZ4lR1arDz5UwI8L+1/pXTIC9IAhPz+KXn?= =?us-ascii?Q?nagDw7S0ZX4vF6ki+aLLRTGXyNKNfudfRRphZvxEqQvhnCmhbX6uVpe8qPHL?= =?us-ascii?Q?zRVii9hi0zXUwMwynsgvbA5AnXOyueWoZRD9LMRTdvSf7bOLsnYhfksTYddO?= =?us-ascii?Q?nMZcy4G4A1srL+oVAH+cqbBRzpZycZuUi2khnG2LM+hpCkJuMxiisilgVs3R?= =?us-ascii?Q?T1/dVCmimxEX0zPUBB0h6uBqhAF1tE7Iup5x/mEjb9Xq5IB+wxe7kQnY2iI7?= =?us-ascii?Q?aJLlnlF9yKkKkQM9qS47n39KXNFc7iejF59nkovh11Kz9aPe8AIzJsGkvc7N?= =?us-ascii?Q?AZTLgur3BBNlxdjUSvIwylmkLIGe9AVl1k6D76NWFC/7z4M/P3mq9yAvLhI9?= =?us-ascii?Q?9i9TMaRPJ8bpOhKb2GBdg1M8khgS5w9gz+5HSvt96zZ7LNN1qsG88X2InJLE?= =?us-ascii?Q?IsTHzIPxd/ZLYoFFOHaj1PTkMcH24QyAamukak6fPAQLz/9SCscXlfKm89+g?= =?us-ascii?Q?hgKo1wi7hPIPcFEpiTAgJsyK1mnA58LMy26G++4/0kI60IfRhfy/?= X-OriginatorOrg: valinux.co.jp X-MS-Exchange-CrossTenant-Network-Message-Id: bf807f9e-ba65-4ec6-96a1-08de63fd5ad0 X-MS-Exchange-CrossTenant-AuthSource: TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Feb 2026 14:54:53.5099 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 7a57bee8-f73d-4c5f-a4f7-d72c91c8c111 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: oILX4gtWMChoabSeaIfFE5vm4+3iXSFUIaerFh+N2ZWbBJV49EzF1XBLe3C3yPstO1wA3zm+aKdE6/8ru9EGHw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYCP286MB2976 Content-Type: text/plain; charset="utf-8" Implement pci_epc_ops.get_remote_resources() for the DesignWare PCIe endpoint controller. Report: - the integrated eDMA control MMIO window - the per-channel linked-list regions for read/write engines This allows endpoint function drivers to discover and map or inform these resources to a remote peer using the generic EPC API. Signed-off-by: Koichiro Den --- .../pci/controller/dwc/pcie-designware-ep.c | 74 +++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/= controller/dwc/pcie-designware-ep.c index 7e7844ff0f7e..5c0dcbf18d07 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -808,6 +808,79 @@ dw_pcie_ep_get_features(struct pci_epc *epc, u8 func_n= o, u8 vfunc_no) return ep->ops->get_features(ep); } =20 +static int +dw_pcie_ep_get_remote_resources(struct pci_epc *epc, u8 func_no, u8 vfunc_= no, + struct pci_epc_remote_resource *resources, + int num_resources) +{ + struct dw_pcie_ep *ep =3D epc_get_drvdata(epc); + struct dw_pcie *pci =3D to_dw_pcie_from_ep(ep); + struct dw_edma_chip *edma =3D &pci->edma; + int ll_cnt =3D 0, needed, idx =3D 0; + resource_size_t dma_size; + phys_addr_t dma_phys; + unsigned int i; + + if (!pci->edma_reg_size) + return 0; + + dma_phys =3D pci->edma_reg_phys; + dma_size =3D pci->edma_reg_size; + + for (i =3D 0; i < edma->ll_wr_cnt; i++) + if (edma->ll_region_wr[i].sz) + ll_cnt++; + + for (i =3D 0; i < edma->ll_rd_cnt; i++) + if (edma->ll_region_rd[i].sz) + ll_cnt++; + + needed =3D 1 + ll_cnt; + + /* Count query mode */ + if (!resources || !num_resources) + return needed; + + if (num_resources < needed) + return -ENOSPC; + + resources[idx++] =3D (struct pci_epc_remote_resource) { + .type =3D PCI_EPC_RR_DMA_CTRL_MMIO, + .phys_addr =3D dma_phys, + .size =3D dma_size, + }; + + /* One LL region per write channel */ + for (i =3D 0; i < edma->ll_wr_cnt; i++) { + if (!edma->ll_region_wr[i].sz) + continue; + + resources[idx++] =3D (struct pci_epc_remote_resource) { + .type =3D PCI_EPC_RR_DMA_CHAN_DESC, + .phys_addr =3D edma->ll_region_wr[i].paddr, + .size =3D edma->ll_region_wr[i].sz, + .u.dma_chan_desc.hw_chan_id =3D i, + .u.dma_chan_desc.ep2rc =3D true, + }; + } + + /* One LL region per read channel */ + for (i =3D 0; i < edma->ll_rd_cnt; i++) { + if (!edma->ll_region_rd[i].sz) + continue; + + resources[idx++] =3D (struct pci_epc_remote_resource) { + .type =3D PCI_EPC_RR_DMA_CHAN_DESC, + .phys_addr =3D edma->ll_region_rd[i].paddr, + .size =3D edma->ll_region_rd[i].sz, + .u.dma_chan_desc.hw_chan_id =3D i, + .u.dma_chan_desc.ep2rc =3D false, + }; + } + + return idx; +} + static const struct pci_epc_ops epc_ops =3D { .write_header =3D dw_pcie_ep_write_header, .set_bar =3D dw_pcie_ep_set_bar, @@ -823,6 +896,7 @@ static const struct pci_epc_ops epc_ops =3D { .start =3D dw_pcie_ep_start, .stop =3D dw_pcie_ep_stop, .get_features =3D dw_pcie_ep_get_features, + .get_remote_resources =3D dw_pcie_ep_get_remote_resources, }; =20 /** --=20 2.51.0