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Tue, 17 Jan 2023 07:42:33 -0600 From: Nipun Gupta To: , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , , , Abhijit Gangurde , Nipun Gupta Subject: [PATCH 06/19] bus/cdx: add rpmsg communication channel for CDX Date: Tue, 17 Jan 2023 19:11:38 +0530 Message-ID: <20230117134139.1298-7-nipun.gupta@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230117134139.1298-1-nipun.gupta@amd.com> References: <20230117134139.1298-1-nipun.gupta@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT036:EE_|PH7PR12MB7456:EE_ X-MS-Office365-Filtering-Correlation-Id: 6e4031cf-cf63-46d3-b374-08daf890b54f 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:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(376002)(136003)(346002)(396003)(39860400002)(451199015)(46966006)(40470700004)(36840700001)(36756003)(40480700001)(478600001)(40460700003)(110136005)(54906003)(26005)(44832011)(41300700001)(2906002)(30864003)(7416002)(316002)(5660300002)(70586007)(4326008)(70206006)(8936002)(8676002)(2616005)(36860700001)(186003)(921005)(356005)(86362001)(82740400003)(1076003)(47076005)(426003)(336012)(81166007)(83380400001)(82310400005)(2101003)(36900700001)(83996005);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jan 2023 13:42:42.6287 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6e4031cf-cf63-46d3-b374-08daf890b54f 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT036.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7456 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@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/bus/cdx/controller/Kconfig | 1 + drivers/bus/cdx/controller/Makefile | 2 +- drivers/bus/cdx/controller/cdx_controller.c | 36 +++- drivers/bus/cdx/controller/cdx_controller.h | 30 +++ drivers/bus/cdx/controller/cdx_rpmsg.c | 222 ++++++++++++++++++++ drivers/bus/cdx/controller/mcdi.h | 9 + 6 files changed, 291 insertions(+), 9 deletions(-) create mode 100644 drivers/bus/cdx/controller/cdx_controller.h create mode 100644 drivers/bus/cdx/controller/cdx_rpmsg.c diff --git a/drivers/bus/cdx/controller/Kconfig b/drivers/bus/cdx/controller/Kconfig index 17f9c6be2fe1..aea3ac86d3aa 100644 --- a/drivers/bus/cdx/controller/Kconfig +++ b/drivers/bus/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/bus/cdx/controller/Makefile b/drivers/bus/cdx/controller/Makefile index f7437c882cc9..f071be411d96 100644 --- a/drivers/bus/cdx/controller/Makefile +++ b/drivers/bus/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/bus/cdx/controller/cdx_controller.c b/drivers/bus/cdx/controller/cdx_controller.c index 9b910c9cb31e..b62a6d3b7bd4 100644 --- a/drivers/bus/cdx/controller/cdx_controller.c +++ b/drivers/bus/cdx/controller/cdx_controller.c @@ -8,6 +8,7 @@ #include #include +#include "cdx_controller.h" #include "../cdx.h" #include "mcdi_functions.h" #include "mcdi.h" @@ -53,20 +54,14 @@ static void cdx_mcdi_request(struct cdx_mcdi *cdx, u8 bufid, 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 void cdx_mcdi_read_response(struct cdx_mcdi *cdx_mcdi, u8 bufid, struct cdx_dword *outbuf, size_t offset, size_t outlen) { - /* - * This will get updated by rpmsg APIs, with RPMSG introduction - * in CDX controller as a transport layer. - */ + cdx_rpmsg_read_resp(cdx_mcdi, outbuf, offset, outlen); } static const struct cdx_mcdi_ops mcdi_ops = { @@ -77,6 +72,19 @@ static const struct cdx_mcdi_ops mcdi_ops = { .mcdi_put_buf = cdx_mcdi_put_buf, }; +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; @@ -174,9 +182,19 @@ static int xlnx_cdx_probe(struct platform_device *pdev) goto cdx_mcdi_buf_fail; } + 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_mcdi->mcdi_buf); + cdx_mcdi->mcdi_buf = NULL; cdx_mcdi_buf_fail: kfree(cdx); cdx_alloc_fail: @@ -192,6 +210,8 @@ 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_mcdi->mcdi_buf); kfree(cdx); diff --git a/drivers/bus/cdx/controller/cdx_controller.h b/drivers/bus/cdx/controller/cdx_controller.h new file mode 100644 index 000000000000..43b7c742df87 --- /dev/null +++ b/drivers/bus/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/bus/cdx/controller/cdx_rpmsg.c b/drivers/bus/cdx/controller/cdx_rpmsg.c new file mode 100644 index 000000000000..147c2fadf67f --- /dev/null +++ b/drivers/bus/cdx/controller/cdx_rpmsg.c @@ -0,0 +1,222 @@ +// 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" + +#define to_rproc_device(_dev) \ + container_of(_dev, struct rproc, dev) + +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) +{ + char send_buf[MCDI_BUF_LEN] = {0}; + + memset(cdx_mcdi->mcdi_buf, 0x0, MCDI_BUF_LEN); + + memcpy(send_buf, hdr, hdr_len); + memcpy(send_buf + hdr_len, sdu, sdu_len); + + return rpmsg_send(cdx_mcdi->ept, send_buf, hdr_len + sdu_len); +} + +void cdx_rpmsg_read_resp(struct cdx_mcdi *cdx_mcdi, + struct cdx_dword *outbuf, size_t offset, + size_t outlen) +{ + memcpy(outbuf, (void *)((u64)cdx_mcdi->mcdi_buf + offset), outlen); +} + +static int find_remoteproc_child_dev(struct device *dev, void *data) +{ + return strstr(dev_name(dev), "remoteproc") ? 1 : 0; +} + +static int cdx_attach_to_rproc(struct platform_device *pdev) +{ + struct platform_device *node_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; + } + + node_pdev = of_find_device_by_node(r5_core_node); + if (!node_pdev) { + ret = -EPROBE_DEFER; + goto pdev_err; + } + + dev = device_find_child(&node_pdev->dev, NULL, find_remoteproc_child_dev); + if (!dev) { + dev_err(&pdev->dev, "no matching remoteproc device found\n"); + ret = -ENODEV; + goto no_child_err; + } + + rp = to_rproc_device(dev); + + /* Attach to remote processor */ + ret = rproc_boot(rp); + if (ret) { + dev_err(&pdev->dev, "Failed to attach to remote processor\n"); + goto no_child_err; + } + + cdx_mcdi->r5_rproc = rp; +no_child_err: + put_device(&node_pdev->dev); +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); +} + +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; + + memcpy(cdx_mcdi->mcdi_buf, data, len); + cdx_mcdi_process_cmd(cdx_mcdi, *(struct cdx_dword *)cdx_mcdi->mcdi_buf); + + 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/bus/cdx/controller/mcdi.h b/drivers/bus/cdx/controller/mcdi.h index a2ee8821b6fe..54e1b27c2a53 100644 --- a/drivers/bus/cdx/controller/mcdi.h +++ b/drivers/bus/cdx/controller/mcdi.h @@ -64,6 +64,10 @@ enum cdx_mcdi_cmd_state { * @mcdi_buf_use: Stores MCDI buffer usage * @mcdi_ops: MCDI operations * @mcdi_buf: MCDI receive buffer + * @r5_rproc : R5 Remoteproc device handle + * @rpdev: RPMsg device + * @ept: RPMsg endpoint + * @work: Post probe work */ struct cdx_mcdi { /* MCDI interface */ @@ -71,6 +75,11 @@ struct cdx_mcdi { unsigned long mcdi_buf_use; const struct cdx_mcdi_ops *mcdi_ops; void *mcdi_buf; + + struct rproc *r5_rproc; + struct rpmsg_device *rpdev; + struct rpmsg_endpoint *ept; + struct work_struct work; }; struct cdx_mcdi_ops {