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Mon, 13 Feb 2023 15:18:53 -0600 Received: from xsjtanmays50.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2375.34 via Frontend Transport; Mon, 13 Feb 2023 15:18:52 -0600 From: Tanmay Shah To: , , , , , CC: , , , Tanmay Shah Subject: [PATCH v3 3/3] remoteproc: xilinx: add mailbox channels for rpmsg Date: Mon, 13 Feb 2023 13:18:26 -0800 Message-ID: <20230213211825.3507034-4-tanmay.shah@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230213211825.3507034-1-tanmay.shah@amd.com> References: <20230213211825.3507034-1-tanmay.shah@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000C985:EE_|DM4PR12MB5088:EE_ X-MS-Office365-Filtering-Correlation-Id: 16465cab-5cd6-4fb5-bc41-08db0e07e9da 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:(13230025)(4636009)(346002)(376002)(396003)(136003)(39860400002)(451199018)(36840700001)(46966006)(40470700004)(83380400001)(4326008)(36860700001)(8676002)(81166007)(316002)(36756003)(41300700001)(54906003)(110136005)(6636002)(2616005)(82310400005)(82740400003)(70206006)(70586007)(336012)(426003)(47076005)(478600001)(40480700001)(2906002)(356005)(5660300002)(30864003)(8936002)(44832011)(40460700003)(1076003)(6666004)(15650500001)(186003)(966005)(86362001)(26005)(17423001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2023 21:18:55.3105 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 16465cab-5cd6-4fb5-bc41-08db0e07e9da 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: CY4PEPF0000C985.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5088 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org This patch makes each r5 core mailbox client and uses tx and rx channels to send and receive data to/from remote processor respectively. This is needed for rpmsg communication to remote processor. Signed-off-by: Tanmay Shah --- Changes in v3: - fix multi-line comment format - do not mixup mailbox information with memory-regions - fix redundant dev_warn for split mode - setting up mailboxes should return an error code - redesign driver to move mailbox setup during driver probe - add .kick function only if mailbox setup is success v2: https://lore.kernel.org/all/20230126213154.1707300-1-tanmay.shah@amd.com/ drivers/remoteproc/xlnx_r5_remoteproc.c | 228 +++++++++++++++++++++++- 1 file changed, 226 insertions(+), 2 deletions(-) diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c index 81af2dea56c2..f7131fe8fe7e 100644 --- a/drivers/remoteproc/xlnx_r5_remoteproc.c +++ b/drivers/remoteproc/xlnx_r5_remoteproc.c @@ -8,16 +8,23 @@ #include #include #include +#include +#include #include #include #include #include #include #include -#include #include "remoteproc_internal.h" +/* IPI buffer MAX length */ +#define IPI_BUF_LEN_MAX 32U + +/* RX mailbox client buffer max length */ +#define MBOX_CLIENT_BUF_MAX (IPI_BUF_LEN_MAX + \ + sizeof(struct zynqmp_ipi_message)) /* * settings for RPU cluster mode which * reflects possible values of xlnx,cluster-mode dt-property @@ -43,6 +50,27 @@ struct mem_bank_data { char *bank_name; }; +/** + * struct mbox_info + * + * @rx_mc_buf: to copy data from mailbox rx channel + * @tx_mc_buf: to copy data to mailbox tx channel + * @r5_core: this mailbox's corresponding r5_core pointer + * @mbox_work: schedule work after receiving data from mailbox + * @mbox_cl: mailbox client + * @tx_chan: mailbox tx channel + * @rx_chan: mailbox rx channel + */ +struct mbox_info { + unsigned char rx_mc_buf[MBOX_CLIENT_BUF_MAX]; + unsigned char tx_mc_buf[MBOX_CLIENT_BUF_MAX]; + struct zynqmp_r5_core *r5_core; + struct work_struct mbox_work; + struct mbox_client mbox_cl; + struct mbox_chan *tx_chan; + struct mbox_chan *rx_chan; +}; + /* * Hardcoded TCM bank values. This will be removed once TCM bindings are * accepted for system-dt specifications and upstreamed in linux kernel @@ -63,6 +91,7 @@ static const struct mem_bank_data zynqmp_tcm_banks[] = { * @tcm_banks: array of each TCM bank data * @rproc: rproc handle * @pm_domain_id: RPU CPU power domain id + * @ipi: pointer to mailbox information */ struct zynqmp_r5_core { struct device *dev; @@ -71,6 +100,7 @@ struct zynqmp_r5_core { struct mem_bank_data **tcm_banks; struct rproc *rproc; u32 pm_domain_id; + struct mbox_info *ipi; }; /** @@ -88,6 +118,178 @@ struct zynqmp_r5_cluster { struct zynqmp_r5_core **r5_cores; }; +/** + * event_notified_idr_cb() - callback for vq_interrupt per notifyid + * @id: rproc->notify id + * @ptr: pointer to idr private data + * @data: data passed to idr_for_each callback + * + * Pass notification to remoteproc virtio + * + * Return: 0. having return is to satisfy the idr_for_each() function + * pointer input argument requirement. + **/ +static int event_notified_idr_cb(int id, void *ptr, void *data) +{ + struct rproc *rproc = data; + + if (rproc_vq_interrupt(rproc, id) == IRQ_NONE) + dev_dbg(&rproc->dev, "data not found for vqid=%d\n", id); + + return 0; +} + +/** + * handle_event_notified() - remoteproc notification work function + * @work: pointer to the work structure + * + * It checks each registered remoteproc notify IDs. + */ +static void handle_event_notified(struct work_struct *work) +{ + struct mbox_info *ipi; + struct rproc *rproc; + + ipi = container_of(work, struct mbox_info, mbox_work); + rproc = ipi->r5_core->rproc; + + /* + * We only use IPI for interrupt. The RPU firmware side may or may + * not write the notifyid when it trigger IPI. + * And thus, we scan through all the registered notifyids and + * find which one is valid to get the message. + * Even if message from firmware is NULL, we attempt to get vqid + */ + idr_for_each(&rproc->notifyids, event_notified_idr_cb, rproc); +} + +/** + * zynqmp_r5_mb_rx_cb() - receive channel mailbox callback + * @cl: mailbox client + * @msg: message pointer + * + * Receive data from ipi buffer, ack interrupt and then + * it will schedule the R5 notification work. + */ +static void zynqmp_r5_mb_rx_cb(struct mbox_client *cl, void *msg) +{ + struct zynqmp_ipi_message *ipi_msg, *buf_msg; + struct mbox_info *ipi; + size_t len; + + ipi = container_of(cl, struct mbox_info, mbox_cl); + + /* copy data from ipi buffer to r5_core */ + ipi_msg = (struct zynqmp_ipi_message *)msg; + buf_msg = (struct zynqmp_ipi_message *)ipi->rx_mc_buf; + len = ipi_msg->len; + if (len > IPI_BUF_LEN_MAX) { + dev_warn(cl->dev, "msg size exceeded than %d\n", + IPI_BUF_LEN_MAX); + len = IPI_BUF_LEN_MAX; + } + buf_msg->len = len; + memcpy(buf_msg->data, ipi_msg->data, len); + + /* received and processed interrupt ack */ + if (mbox_send_message(ipi->rx_chan, NULL) < 0) + dev_err(cl->dev, "ack failed to mbox rx_chan\n"); + + schedule_work(&ipi->mbox_work); +} + +/** + * zynqmp_r5_setup_mbox() - Setup mailboxes related properties + * this is used for each individual R5 core + * + * @cdev: child node device + * + * Function to setup mailboxes related properties + * return : NULL if failed else pointer to mbox_info + */ +static struct mbox_info *zynqmp_r5_setup_mbox(struct device *cdev) +{ + struct mbox_client *mbox_cl; + struct mbox_info *ipi; + + ipi = kzalloc(sizeof(*ipi), GFP_KERNEL); + if (!ipi) + return NULL; + + mbox_cl = &ipi->mbox_cl; + mbox_cl->rx_callback = zynqmp_r5_mb_rx_cb; + mbox_cl->tx_block = false; + mbox_cl->knows_txdone = false; + mbox_cl->tx_done = NULL; + mbox_cl->dev = cdev; + + /* Request TX and RX channels */ + ipi->tx_chan = mbox_request_channel_byname(mbox_cl, "tx"); + if (IS_ERR(ipi->tx_chan)) { + ipi->tx_chan = NULL; + kfree(ipi); + dev_warn(cdev, "mbox tx channel request failed\n"); + return NULL; + } + + ipi->rx_chan = mbox_request_channel_byname(mbox_cl, "rx"); + if (IS_ERR(ipi->rx_chan)) { + mbox_free_channel(ipi->tx_chan); + ipi->rx_chan = NULL; + ipi->tx_chan = NULL; + kfree(ipi); + dev_warn(cdev, "mbox rx channel request failed\n"); + return NULL; + } + + INIT_WORK(&ipi->mbox_work, handle_event_notified); + + return ipi; +} + +static void zynqmp_r5_free_mbox(struct mbox_info *ipi) +{ + if (!ipi) + return; + + if (ipi->tx_chan) { + mbox_free_channel(ipi->tx_chan); + ipi->tx_chan = NULL; + } + + if (ipi->rx_chan) { + mbox_free_channel(ipi->rx_chan); + ipi->rx_chan = NULL; + } + + kfree(ipi); +} + +/* + * zynqmp_r5_core_kick() - kick a firmware if mbox is provided + * @rproc: r5 core's corresponding rproc structure + * @vqid: virtqueue ID + */ +static void zynqmp_r5_rproc_kick(struct rproc *rproc, int vqid) +{ + struct zynqmp_r5_core *r5_core = rproc->priv; + struct device *dev = r5_core->dev; + struct zynqmp_ipi_message *mb_msg; + struct mbox_info *ipi; + int ret; + + ipi = r5_core->ipi; + if (!ipi) + return; + + mb_msg = (struct zynqmp_ipi_message *)ipi->tx_mc_buf; + memcpy(mb_msg->data, &vqid, sizeof(vqid)); + mb_msg->len = sizeof(vqid); + ret = mbox_send_message(ipi->tx_chan, mb_msg); + if (ret < 0) + dev_warn(dev, "failed to send message\n"); +} + /* * zynqmp_r5_set_mode() * @@ -617,7 +819,7 @@ static int zynqmp_r5_rproc_unprepare(struct rproc *rproc) return 0; } -static const struct rproc_ops zynqmp_r5_rproc_ops = { +static struct rproc_ops zynqmp_r5_rproc_ops = { .prepare = zynqmp_r5_rproc_prepare, .unprepare = zynqmp_r5_rproc_unprepare, .start = zynqmp_r5_rproc_start, @@ -642,6 +844,7 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev) { struct zynqmp_r5_core *r5_core; struct rproc *r5_rproc; + struct mbox_info *ipi; int ret; /* Set up DMA mask */ @@ -649,12 +852,23 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev) if (ret) return ERR_PTR(ret); + /* + * If mailbox nodes are disabled using "status" property then setting up + * mailbox channels will be failed. In that case we don't really need + * kick() operation. Include .kick() only if mbox channels are acquired + * successfully. + */ + ipi = zynqmp_r5_setup_mbox(cdev); + if (ipi) + zynqmp_r5_rproc_ops.kick = zynqmp_r5_rproc_kick; + /* Allocate remoteproc instance */ r5_rproc = rproc_alloc(cdev, dev_name(cdev), &zynqmp_r5_rproc_ops, NULL, sizeof(struct zynqmp_r5_core)); if (!r5_rproc) { dev_err(cdev, "failed to allocate memory for rproc instance\n"); + zynqmp_r5_free_mbox(ipi); return ERR_PTR(-ENOMEM); } @@ -665,6 +879,7 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev) if (!r5_core->np) { dev_err(cdev, "can't get device node for r5 core\n"); ret = -EINVAL; + zynqmp_r5_free_mbox(ipi); goto free_rproc; } @@ -672,10 +887,17 @@ static struct zynqmp_r5_core *zynqmp_r5_add_rproc_core(struct device *cdev) ret = rproc_add(r5_rproc); if (ret) { dev_err(cdev, "failed to add r5 remoteproc\n"); + zynqmp_r5_free_mbox(ipi); goto free_rproc; } + if (ipi) { + r5_core->ipi = ipi; + ipi->r5_core = r5_core; + } + r5_core->rproc = r5_rproc; + return r5_core; free_rproc: @@ -918,6 +1140,7 @@ static int zynqmp_r5_cluster_init(struct zynqmp_r5_cluster *cluster) while (i >= 0) { put_device(child_devs[i]); if (r5_cores[i]) { + zynqmp_r5_free_mbox(r5_cores[i]->ipi); of_reserved_mem_device_release(r5_cores[i]->dev); rproc_del(r5_cores[i]->rproc); rproc_free(r5_cores[i]->rproc); @@ -942,6 +1165,7 @@ static void zynqmp_r5_cluster_exit(void *data) for (i = 0; i < cluster->core_count; i++) { r5_core = cluster->r5_cores[i]; + zynqmp_r5_free_mbox(r5_core->ipi); of_reserved_mem_device_release(r5_core->dev); put_device(r5_core->dev); rproc_del(r5_core->rproc);