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Received: from HE1PR0401MB2331.eurprd04.prod.outlook.com (2603:10a6:3:24::22) by DU2PR04MB8600.eurprd04.prod.outlook.com (2603:10a6:10:2db::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5834.9; Thu, 24 Nov 2022 05:51:09 +0000 Received: from HE1PR0401MB2331.eurprd04.prod.outlook.com ([fe80::a405:3557:91bc:9230]) by HE1PR0401MB2331.eurprd04.prod.outlook.com ([fe80::a405:3557:91bc:9230%12]) with mapi id 15.20.5834.015; Thu, 24 Nov 2022 05:51:09 +0000 From: Frank Li To: lpieralisi@kernel.org Cc: Frank.Li@nxp.com, aisheng.dong@nxp.com, bhelgaas@google.com, devicetree@vger.kernel.org, festevam@gmail.com, imx@lists.linux.dev, jdmason@kudzu.us, kernel@pengutronix.de, kishon@ti.com, krzysztof.kozlowski+dt@linaro.org, kw@linux.com, linux-arm-kernel@lists.infradead.org, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, lorenzo.pieralisi@arm.com, lznuaa@gmail.com, manivannan.sadhasivam@linaro.org, maz@kernel.org, ntb@lists.linux.dev, peng.fan@nxp.com, robh+dt@kernel.org, s.hauer@pengutronix.de, shawnguo@kernel.org, tglx@linutronix.de Subject: [PATCH v13 1/2] PCI: endpoint: pci-epf-vntb: change doorbell register offset calc mathod Date: Thu, 24 Nov 2022 00:50:35 -0500 Message-Id: <20221124055036.1630573-2-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221124055036.1630573-1-Frank.Li@nxp.com> References: <20221124055036.1630573-1-Frank.Li@nxp.com> X-ClientProxiedBy: BYAPR05CA0043.namprd05.prod.outlook.com (2603:10b6:a03:74::20) To HE1PR0401MB2331.eurprd04.prod.outlook.com (2603:10a6:3:24::22) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1PR0401MB2331:EE_|DU2PR04MB8600:EE_ X-MS-Office365-Filtering-Correlation-Id: a6870bdd-d50f-4c25-66f1-08dacddfe2a6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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writel(db_data, ndev->db_reg + (db_entry_size * interrupt_num) + db_offset); ... } The door register offset's formular is offset = db_entry_size * interrupt_num + db_offset[interrupt_number] Previous db_entry_size is 4, all db_offset is 0. irq | offset -------------- 0 0 1 4 2 8 ... Change to db_entry_size is 0 and db_offset is 0, 4, 8, ... So we can get the same map value between irq and offset. This will be convenience for hardware doorbell register memory map. Signed-off-by: Frank Li --- drivers/pci/endpoint/functions/pci-epf-vntb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/endpoint/functions/pci-epf-vntb.c b/drivers/pci/endpoint/functions/pci-epf-vntb.c index 04698e7995a5..0d744975f815 100644 --- a/drivers/pci/endpoint/functions/pci-epf-vntb.c +++ b/drivers/pci/endpoint/functions/pci-epf-vntb.c @@ -461,11 +461,11 @@ static int epf_ntb_config_spad_bar_alloc(struct epf_ntb *ntb) ctrl->num_mws = ntb->num_mws; ntb->spad_size = spad_size; - ctrl->db_entry_size = sizeof(u32); + ctrl->db_entry_size = 0; for (i = 0; i < ntb->db_count; i++) { ntb->reg->db_data[i] = 1 + i; - ntb->reg->db_offset[i] = 0; + ntb->reg->db_offset[i] = sizeof(u32) * i; } return 0;