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Tue, 31 Jan 2023 02:41:41 -0600 From: Nipun Gupta To: , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , , , Abhijit Gangurde , Nipun Gupta Subject: [PATCH v7 6/7] cdx: add rpmsg communication channel for CDX Date: Tue, 31 Jan 2023 14:10:48 +0530 Message-ID: <20230131084049.23698-7-nipun.gupta@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230131084049.23698-1-nipun.gupta@amd.com> References: <20230131084049.23698-1-nipun.gupta@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT090:EE_|CY5PR12MB6456:EE_ X-MS-Office365-Filtering-Correlation-Id: 854503a5-25a4-4f61-8b60-08db03671d49 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(396003)(346002)(136003)(39860400002)(376002)(451199018)(40470700004)(46966006)(36840700001)(7416002)(8676002)(4326008)(2616005)(8936002)(70586007)(70206006)(336012)(5660300002)(30864003)(83380400001)(426003)(44832011)(1076003)(47076005)(110136005)(316002)(54906003)(356005)(186003)(478600001)(26005)(81166007)(41300700001)(40460700003)(921005)(36756003)(82310400005)(86362001)(40480700001)(2906002)(82740400003)(36860700001)(36900700001)(2101003)(83996005);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Jan 2023 08:42:40.9524 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 854503a5-25a4-4f61-8b60-08db03671d49 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT090.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6456 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Abhijit Gangurde RPMsg is used as a transport communication channel. This change introduces RPMsg driver and integrates it with the CDX controller. Signed-off-by: Abhijit Gangurde Signed-off-by: Nipun Gupta --- drivers/cdx/controller/Kconfig | 1 + drivers/cdx/controller/Makefile | 2 +- drivers/cdx/controller/cdx_controller.c | 31 +++- drivers/cdx/controller/cdx_controller.h | 30 ++++ drivers/cdx/controller/cdx_rpmsg.c | 202 ++++++++++++++++++++++++ drivers/cdx/controller/mcdi.h | 9 ++ 6 files changed, 270 insertions(+), 5 deletions(-) create mode 100644 drivers/cdx/controller/cdx_controller.h create mode 100644 drivers/cdx/controller/cdx_rpmsg.c diff --git a/drivers/cdx/controller/Kconfig b/drivers/cdx/controller/Kconfig index 17f9c6be2fe1..aea3ac86d3aa 100644 --- a/drivers/cdx/controller/Kconfig +++ b/drivers/cdx/controller/Kconfig @@ -9,6 +9,7 @@ if CDX_BUS config CDX_CONTROLLER tristate "CDX bus controller" + select RPMSG help CDX controller drives the CDX bus. It interacts with firmware to get the hardware devices and registers with diff --git a/drivers/cdx/controller/Makefile b/drivers/cdx/controller/Makefile index f7437c882cc9..f071be411d96 100644 --- a/drivers/cdx/controller/Makefile +++ b/drivers/cdx/controller/Makefile @@ -6,4 +6,4 @@ # obj-$(CONFIG_CDX_CONTROLLER) += cdx-controller.o -cdx-controller-objs := cdx_controller.o mcdi.o mcdi_functions.o +cdx-controller-objs := cdx_controller.o cdx_rpmsg.o mcdi.o mcdi_functions.o diff --git a/drivers/cdx/controller/cdx_controller.c b/drivers/cdx/controller/cdx_controller.c index b27be2097305..c40027cc38aa 100644 --- a/drivers/cdx/controller/cdx_controller.c +++ b/drivers/cdx/controller/cdx_controller.c @@ -9,6 +9,7 @@ #include #include +#include "cdx_controller.h" #include "../cdx.h" #include "mcdi_functions.h" #include "mcdi.h" @@ -22,10 +23,7 @@ static void cdx_mcdi_request(struct cdx_mcdi *cdx, const struct cdx_dword *hdr, size_t hdr_len, const struct cdx_dword *sdu, size_t sdu_len) { - /* - * This will get updated by rpmsg APIs, with RPMSG introduction - * in CDX controller as a transport layer. - */ + cdx_rpmsg_send(cdx, hdr, hdr_len, sdu, sdu_len); } static const struct cdx_mcdi_ops mcdi_ops = { @@ -33,6 +31,19 @@ static const struct cdx_mcdi_ops mcdi_ops = { .mcdi_request = cdx_mcdi_request, }; +void cdx_rpmsg_post_probe(struct cdx_controller *cdx) +{ + /* Register CDX controller with CDX bus driver */ + if (cdx_register_controller(cdx)) + dev_err(cdx->dev, "Failed to register CDX controller\n"); +} + +void cdx_rpmsg_pre_remove(struct cdx_controller *cdx) +{ + cdx_unregister_controller(cdx); + cdx_mcdi_wait_for_quiescence(cdx->priv, MCDI_RPC_TIMEOUT); +} + static int cdx_scan_devices(struct cdx_controller *cdx) { struct cdx_mcdi *cdx_mcdi = cdx->priv; @@ -124,8 +135,18 @@ static int xlnx_cdx_probe(struct platform_device *pdev) cdx->priv = cdx_mcdi; cdx->ops = &cdx_ops; + ret = cdx_setup_rpmsg(pdev); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "Failed to register CDX RPMsg transport\n"); + goto cdx_rpmsg_fail; + } + + dev_info(&pdev->dev, "Successfully registered CDX controller with RPMsg as transport\n"); return 0; +cdx_rpmsg_fail: + kfree(cdx); cdx_alloc_fail: cdx_mcdi_finish(cdx_mcdi); mcdi_init_fail: @@ -139,6 +160,8 @@ static int xlnx_cdx_remove(struct platform_device *pdev) struct cdx_controller *cdx = platform_get_drvdata(pdev); struct cdx_mcdi *cdx_mcdi = cdx->priv; + cdx_destroy_rpmsg(pdev); + kfree(cdx); cdx_mcdi_finish(cdx_mcdi); diff --git a/drivers/cdx/controller/cdx_controller.h b/drivers/cdx/controller/cdx_controller.h new file mode 100644 index 000000000000..43b7c742df87 --- /dev/null +++ b/drivers/cdx/controller/cdx_controller.h @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0 + * + * Header file for the CDX Controller + * + * Copyright (C) 2022-2023, Advanced Micro Devices, Inc. + */ + +#ifndef _CDX_CONTROLLER_H_ +#define _CDX_CONTROLLER_H_ + +#include +#include "mcdi_functions.h" + +void cdx_rpmsg_post_probe(struct cdx_controller *cdx); + +void cdx_rpmsg_pre_remove(struct cdx_controller *cdx); + +int cdx_rpmsg_send(struct cdx_mcdi *cdx_mcdi, + const struct cdx_dword *hdr, size_t hdr_len, + const struct cdx_dword *sdu, size_t sdu_len); + +void cdx_rpmsg_read_resp(struct cdx_mcdi *cdx_mcdi, + struct cdx_dword *outbuf, size_t offset, + size_t outlen); + +int cdx_setup_rpmsg(struct platform_device *pdev); + +void cdx_destroy_rpmsg(struct platform_device *pdev); + +#endif /* _CDX_CONT_PRIV_H_ */ diff --git a/drivers/cdx/controller/cdx_rpmsg.c b/drivers/cdx/controller/cdx_rpmsg.c new file mode 100644 index 000000000000..2be9bb279f81 --- /dev/null +++ b/drivers/cdx/controller/cdx_rpmsg.c @@ -0,0 +1,202 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Platform driver for CDX bus. + * + * Copyright (C) 2022-2023, Advanced Micro Devices, Inc. + */ + +#include +#include +#include +#include +#include + +#include "../cdx.h" +#include "cdx_controller.h" +#include "mcdi_functions.h" +#include "mcdi.h" + +static struct rpmsg_device_id cdx_rpmsg_id_table[] = { + { .name = "mcdi_ipc" }, + { }, +}; +MODULE_DEVICE_TABLE(rpmsg, cdx_rpmsg_id_table); + +int cdx_rpmsg_send(struct cdx_mcdi *cdx_mcdi, + const struct cdx_dword *hdr, size_t hdr_len, + const struct cdx_dword *sdu, size_t sdu_len) +{ + unsigned char *send_buf; + int rc; + + send_buf = kzalloc(hdr_len + sdu_len, GFP_KERNEL); + if (!send_buf) + return -ENOMEM; + + memcpy(send_buf, hdr, hdr_len); + memcpy(send_buf + hdr_len, sdu, sdu_len); + + rc = rpmsg_send(cdx_mcdi->ept, send_buf, hdr_len + sdu_len); + kfree(send_buf); + + return rc; +} + +static int cdx_attach_to_rproc(struct platform_device *pdev) +{ + struct device_node *r5_core_node; + struct cdx_controller *cdx_c; + struct cdx_mcdi *cdx_mcdi; + struct device *dev; + struct rproc *rp; + int ret; + + dev = &pdev->dev; + cdx_c = platform_get_drvdata(pdev); + cdx_mcdi = cdx_c->priv; + + r5_core_node = of_parse_phandle(dev->of_node, "xlnx,rproc", 0); + if (!r5_core_node) { + dev_err(&pdev->dev, "xlnx,rproc: invalid phandle\n"); + return -EINVAL; + } + + rp = rproc_get_by_phandle(r5_core_node->phandle); + if (!rp) { + ret = -EPROBE_DEFER; + goto pdev_err; + } + + /* Attach to remote processor */ + ret = rproc_boot(rp); + if (ret) { + dev_err(&pdev->dev, "Failed to attach to remote processor\n"); + rproc_put(rp); + goto pdev_err; + } + + cdx_mcdi->r5_rproc = rp; +pdev_err: + of_node_put(r5_core_node); + return ret; +} + +static void cdx_detach_to_r5(struct platform_device *pdev) +{ + struct cdx_controller *cdx_c; + struct cdx_mcdi *cdx_mcdi; + + cdx_c = platform_get_drvdata(pdev); + cdx_mcdi = cdx_c->priv; + + rproc_detach(cdx_mcdi->r5_rproc); + rproc_put(cdx_mcdi->r5_rproc); +} + +static int cdx_rpmsg_cb(struct rpmsg_device *rpdev, void *data, + int len, void *priv, u32 src) +{ + struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev); + struct cdx_mcdi *cdx_mcdi = cdx_c->priv; + + if (len > MCDI_BUF_LEN) + return -EINVAL; + + cdx_mcdi_process_cmd(cdx_mcdi, (struct cdx_dword *)data, len); + + return 0; +} + +static void cdx_rpmsg_post_probe_work(struct work_struct *work) +{ + struct cdx_controller *cdx_c; + struct cdx_mcdi *cdx_mcdi; + + cdx_mcdi = container_of(work, struct cdx_mcdi, work); + cdx_c = dev_get_drvdata(&cdx_mcdi->rpdev->dev); + cdx_rpmsg_post_probe(cdx_c); +} + +static int cdx_rpmsg_probe(struct rpmsg_device *rpdev) +{ + struct rpmsg_channel_info chinfo = {0}; + struct cdx_controller *cdx_c; + struct cdx_mcdi *cdx_mcdi; + + cdx_c = (struct cdx_controller *)cdx_rpmsg_id_table[0].driver_data; + cdx_mcdi = cdx_c->priv; + + chinfo.src = RPMSG_ADDR_ANY; + chinfo.dst = rpdev->dst; + strscpy(chinfo.name, cdx_rpmsg_id_table[0].name, + strlen(cdx_rpmsg_id_table[0].name)); + + cdx_mcdi->ept = rpmsg_create_ept(rpdev, cdx_rpmsg_cb, NULL, chinfo); + if (!cdx_mcdi->ept) { + dev_err_probe(&rpdev->dev, -ENXIO, + "Failed to create ept for channel %s\n", + chinfo.name); + return -EINVAL; + } + + cdx_mcdi->rpdev = rpdev; + dev_set_drvdata(&rpdev->dev, cdx_c); + + schedule_work(&cdx_mcdi->work); + return 0; +} + +static void cdx_rpmsg_remove(struct rpmsg_device *rpdev) +{ + struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev); + struct cdx_mcdi *cdx_mcdi = cdx_c->priv; + + flush_work(&cdx_mcdi->work); + cdx_rpmsg_pre_remove(cdx_c); + + rpmsg_destroy_ept(cdx_mcdi->ept); + dev_set_drvdata(&rpdev->dev, NULL); +} + +static struct rpmsg_driver cdx_rpmsg_driver = { + .drv.name = KBUILD_MODNAME, + .id_table = cdx_rpmsg_id_table, + .probe = cdx_rpmsg_probe, + .remove = cdx_rpmsg_remove, + .callback = cdx_rpmsg_cb, +}; + +int cdx_setup_rpmsg(struct platform_device *pdev) +{ + struct cdx_controller *cdx_c; + struct cdx_mcdi *cdx_mcdi; + int ret; + + /* Attach to remote processor */ + ret = cdx_attach_to_rproc(pdev); + if (ret) + return ret; + + cdx_c = platform_get_drvdata(pdev); + cdx_mcdi = cdx_c->priv; + + /* Register RPMsg driver */ + cdx_rpmsg_id_table[0].driver_data = (kernel_ulong_t)cdx_c; + + INIT_WORK(&cdx_mcdi->work, cdx_rpmsg_post_probe_work); + ret = register_rpmsg_driver(&cdx_rpmsg_driver); + if (ret < 0) { + dev_err(&pdev->dev, + "Failed to register cdx RPMsg driver: %d\n", ret); + cdx_detach_to_r5(pdev); + } + + return ret; +} + +void cdx_destroy_rpmsg(struct platform_device *pdev) +{ + unregister_rpmsg_driver(&cdx_rpmsg_driver); + + cdx_detach_to_r5(pdev); +} diff --git a/drivers/cdx/controller/mcdi.h b/drivers/cdx/controller/mcdi.h index 63933ede33ed..a4d750816bd2 100644 --- a/drivers/cdx/controller/mcdi.h +++ b/drivers/cdx/controller/mcdi.h @@ -62,11 +62,20 @@ enum cdx_mcdi_cmd_state { * with CDX controller. * @mcdi: MCDI interface * @mcdi_ops: MCDI operations + * @r5_rproc : R5 Remoteproc device handle + * @rpdev: RPMsg device + * @ept: RPMsg endpoint + * @work: Post probe work */ struct cdx_mcdi { /* MCDI interface */ struct cdx_mcdi_data *mcdi; const struct cdx_mcdi_ops *mcdi_ops; + + struct rproc *r5_rproc; + struct rpmsg_device *rpdev; + struct rpmsg_endpoint *ept; + struct work_struct work; }; struct cdx_mcdi_ops { -- 2.17.1