From patchwork Thu Jan 24 15:24:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Srinivas Kandagatla X-Patchwork-Id: 10779361 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8783B746 for ; Thu, 24 Jan 2019 15:26:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 747A73097B for ; Thu, 24 Jan 2019 15:26:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6826230B74; Thu, 24 Jan 2019 15:26:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 935573097B for ; Thu, 24 Jan 2019 15:26:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728726AbfAXP0Q (ORCPT ); Thu, 24 Jan 2019 10:26:16 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:33844 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728649AbfAXPZw (ORCPT ); Thu, 24 Jan 2019 10:25:52 -0500 Received: by mail-wm1-f67.google.com with SMTP id y185so2610452wmd.1 for ; Thu, 24 Jan 2019 07:25:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=HBoSjW/9C2BJWOWwi68QsUaCxo6aNQtRfwlrGXtdlvs=; b=WAbWRb5opunKVJHV2gvmr3SMyt9rlZ5menzvqdoDe5vTpvrbueGwR+iAM9KLAJfbmn 18mJmVVUnvuzAoXAIRg1nCcVMvUsMeMFcKoljyDiGBjzSrTJJ1lIvbKJ7SJJ6ofLZkc0 wnZrjYLvfbl0lOwrp7p6GC2iA35W7MkuOWRyU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=HBoSjW/9C2BJWOWwi68QsUaCxo6aNQtRfwlrGXtdlvs=; b=jfOZmoa1ucrmKllu3gioJH/BxakFymmLIAzWuyVe06a4PeX2FKtfLSaO5M6snNCf/q PNcp8HPNuhoH4STaw2VLRFqLyfXgh+ukkvj5o6goWC7EqK08ff8daL+Zjoa0lr5eM2zh 7w0AEuZhYa50bwa1PvlTZ+4HUZKzBmArc4cC5jBcN9eRvY8gPVs2/oJ8Xib1PkFPdVmI TcAy1Ks/xrLi0PFYeDfRV/OiUekYwDJ8x5uO1WaKJ+qEQMebcBL5akc21TJSHGr2KWi5 4T1L18a6iBZaSZLWjICmoy89ZBK8vDuL3Xc+vXqvAZ/68szsSocyVPB8r0C3bq/NhjtD YHPw== X-Gm-Message-State: AJcUukfNAs8Y9iVXksraQw5Oc7tZeMFl2lA9e0rkUwwyv5sQPmIZ06tR XBdhOwvkwJVa++ap7zWkZ2d2GS2qb9I= X-Google-Smtp-Source: ALg8bN5urnWKjk2w83dRbV+JHXTVwAJuN6qSheFFB/iCDpBym5M37AMGUq30H4aJMetOds0TE6KMIA== X-Received: by 2002:a1c:3c06:: with SMTP id j6mr2863882wma.27.1548343549819; Thu, 24 Jan 2019 07:25:49 -0800 (PST) Received: from srini-hackbox.lan (cpc89974-aztw32-2-0-cust43.18-1.cable.virginm.net. [86.30.250.44]) by smtp.gmail.com with ESMTPSA id z12sm80371157wrh.35.2019.01.24.07.25.48 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 24 Jan 2019 07:25:49 -0800 (PST) From: Srinivas Kandagatla To: robh+dt@kernel.org, gregkh@linuxfoundation.org, arnd@arndb.de Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, bjorn.andersson@linaro.org, bkumar@qti.qualcomm.com, linux-arm-msm@vger.kernel.org, thierry.escande@linaro.org, Srinivas Kandagatla Subject: [PATCH v4 2/5] misc: fastrpc: Add Qualcomm fastrpc basic driver model Date: Thu, 24 Jan 2019 15:24:09 +0000 Message-Id: <20190124152412.10503-3-srinivas.kandagatla@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190124152412.10503-1-srinivas.kandagatla@linaro.org> References: <20190124152412.10503-1-srinivas.kandagatla@linaro.org> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds basic driver model for qualcomm fastrpc. Each DSP rpmsg channel is represented as fastrpc channel context and is exposed as a character driver for userspace interface. Each compute context bank is represented as fastrpc-session-context, which are dynamically managed by the channel context char device. Co-developed-by: Thierry Escande Signed-off-by: Thierry Escande Signed-off-by: Srinivas Kandagatla --- drivers/misc/Kconfig | 10 ++ drivers/misc/Makefile | 1 + drivers/misc/fastrpc.c | 323 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 334 insertions(+) create mode 100644 drivers/misc/fastrpc.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index f417b06e11c5..7e0726253755 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -295,6 +295,16 @@ config QCOM_COINCELL to maintain PMIC register and RTC state in the absence of external power. +config QCOM_FASTRPC + tristate "Qualcomm FastRPC" + depends on ARCH_QCOM || COMPILE_TEST + depends on RPMSG + help + Provides a communication mechanism that allows for clients to + make remote method invocations across processor boundary to + applications DSP processor. Say M if you want to enable this + module. + config SGI_GRU tristate "SGI GRU driver" depends on X86_UV && SMP diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index e39ccbbc1b3a..623d002c59ce 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_TIFM_CORE) += tifm_core.o obj-$(CONFIG_TIFM_7XX1) += tifm_7xx1.o obj-$(CONFIG_PHANTOM) += phantom.o obj-$(CONFIG_QCOM_COINCELL) += qcom-coincell.o +obj-$(CONFIG_QCOM_FASTRPC) += fastrpc.o obj-$(CONFIG_SENSORS_BH1770) += bh1770glc.o obj-$(CONFIG_SENSORS_APDS990X) += apds990x.o obj-$(CONFIG_SGI_IOC4) += ioc4.o diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c new file mode 100644 index 000000000000..d744a93eb922 --- /dev/null +++ b/drivers/misc/fastrpc.c @@ -0,0 +1,323 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2011-2018, The Linux Foundation. All rights reserved. +// Copyright (c) 2018, Linaro Limited + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ADSP_DOMAIN_ID (0) +#define MDSP_DOMAIN_ID (1) +#define SDSP_DOMAIN_ID (2) +#define CDSP_DOMAIN_ID (3) +#define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/ +#define FASTRPC_MAX_SESSIONS 9 /*8 compute, 1 cpz*/ +#define FASTRPC_CTX_MAX (256) +#define FASTRPC_CTXID_MASK (0xFF0) +#define FASTRPC_DEVICE_NAME "fastrpc" + +#define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev) + +static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp", + "sdsp", "cdsp"}; + +struct fastrpc_session_ctx { + struct device *dev; + int sid; + bool used; + bool valid; +}; + +struct fastrpc_channel_ctx { + int domain_id; + int sesscount; + struct rpmsg_device *rpdev; + struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS]; + spinlock_t lock; + struct idr ctx_idr; + struct list_head users; + struct miscdevice miscdev; +}; + +struct fastrpc_user { + struct list_head user; + struct list_head maps; + struct list_head pending; + + struct fastrpc_channel_ctx *cctx; + struct fastrpc_session_ctx *sctx; + + int tgid; + int pd; + /* Lock for lists */ + spinlock_t lock; + /* lock for allocations */ + struct mutex mutex; +}; + +static struct fastrpc_session_ctx *fastrpc_session_alloc( + struct fastrpc_channel_ctx *cctx) +{ + struct fastrpc_session_ctx *session = NULL; + int i; + + spin_lock(&cctx->lock); + for (i = 0; i < cctx->sesscount; i++) { + if (!cctx->session[i].used && cctx->session[i].valid) { + cctx->session[i].used = true; + session = &cctx->session[i]; + break; + } + } + spin_unlock(&cctx->lock); + + return session; +} + +static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, + struct fastrpc_session_ctx *session) +{ + spin_lock(&cctx->lock); + session->used = false; + spin_unlock(&cctx->lock); +} + +static int fastrpc_device_release(struct inode *inode, struct file *file) +{ + struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; + struct fastrpc_channel_ctx *cctx = fl->cctx; + + spin_lock(&cctx->lock); + list_del(&fl->user); + spin_unlock(&cctx->lock); + + fastrpc_session_free(fl->cctx, fl->sctx); + + mutex_destroy(&fl->mutex); + kfree(fl); + file->private_data = NULL; + + return 0; +} + +static int fastrpc_device_open(struct inode *inode, struct file *filp) +{ + struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data); + struct fastrpc_user *fl = NULL; + + fl = kzalloc(sizeof(*fl), GFP_KERNEL); + if (!fl) + return -ENOMEM; + + filp->private_data = fl; + spin_lock_init(&fl->lock); + mutex_init(&fl->mutex); + INIT_LIST_HEAD(&fl->pending); + INIT_LIST_HEAD(&fl->maps); + INIT_LIST_HEAD(&fl->user); + fl->tgid = current->tgid; + fl->cctx = cctx; + spin_lock(&cctx->lock); + list_add_tail(&fl->user, &cctx->users); + spin_unlock(&cctx->lock); + fl->sctx = fastrpc_session_alloc(cctx); + + return 0; +} + +static const struct file_operations fastrpc_fops = { + .open = fastrpc_device_open, + .release = fastrpc_device_release, +}; + +static int fastrpc_cb_probe(struct platform_device *pdev) +{ + struct fastrpc_channel_ctx *cctx; + struct fastrpc_session_ctx *sess; + struct device *dev = &pdev->dev; + int i, sessions = 0; + + cctx = dev_get_drvdata(dev->parent); + if (!cctx) + return -EINVAL; + + of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); + + spin_lock(&cctx->lock); + sess = &cctx->session[cctx->sesscount]; + sess->used = false; + sess->valid = true; + sess->dev = dev; + dev_set_drvdata(dev, sess); + + if (of_property_read_u32(dev->of_node, "reg", &sess->sid)) + dev_info(dev, "FastRPC Session ID not specified in DT\n"); + + if (sessions > 0) { + struct fastrpc_session_ctx *dup_sess; + + for (i = 1; i < sessions; i++) { + if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS) + break; + dup_sess = &cctx->session[cctx->sesscount]; + memcpy(dup_sess, sess, sizeof(*dup_sess)); + } + } + cctx->sesscount++; + spin_unlock(&cctx->lock); + dma_set_mask(dev, DMA_BIT_MASK(32)); + + return 0; +} + +static int fastrpc_cb_remove(struct platform_device *pdev) +{ + struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent); + struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev); + int i; + + spin_lock(&cctx->lock); + for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) { + if (cctx->session[i].sid == sess->sid) { + cctx->session[i].valid = false; + cctx->sesscount--; + } + } + spin_unlock(&cctx->lock); + + return 0; +} + +static const struct of_device_id fastrpc_match_table[] = { + { .compatible = "qcom,fastrpc-compute-cb", }, + {} +}; + +static struct platform_driver fastrpc_cb_driver = { + .probe = fastrpc_cb_probe, + .remove = fastrpc_cb_remove, + .driver = { + .name = "qcom,fastrpc-cb", + .of_match_table = fastrpc_match_table, + .suppress_bind_attrs = true, + }, +}; + +static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) +{ + struct device *rdev = &rpdev->dev; + struct fastrpc_channel_ctx *data; + int i, err, domain_id = 0; + const char *domain; + + data = devm_kzalloc(rdev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + err = of_property_read_string(rdev->of_node, "label", &domain); + if (err) { + dev_info(rdev, "FastRPC Domain not specified in DT\n"); + return err; + } + + for (i = 0; i < CDSP_DOMAIN_ID; i++) { + if (!strcmp(domains[i], domain)) { + domain_id = i; + break; + } + } + + if (domain_id > CDSP_DOMAIN_ID) { + dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id); + return -EINVAL; + } + + data->miscdev.minor = MISC_DYNAMIC_MINOR; + data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s", + domains[domain_id]); + data->miscdev.fops = &fastrpc_fops; + err = misc_register(&data->miscdev); + if (err) + return err; + + dev_set_drvdata(&rpdev->dev, data); + dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32)); + INIT_LIST_HEAD(&data->users); + spin_lock_init(&data->lock); + idr_init(&data->ctx_idr); + data->domain_id = domain_id; + data->rpdev = rpdev; + + return of_platform_populate(rdev->of_node, NULL, NULL, rdev); +} + +static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) +{ + struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); + + misc_deregister(&cctx->miscdev); + of_platform_depopulate(&rpdev->dev); + kfree(cctx); +} + +static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data, + int len, void *priv, u32 addr) +{ + return 0; +} + +static const struct of_device_id fastrpc_rpmsg_of_match[] = { + { .compatible = "qcom,fastrpc" }, + { }, +}; +MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match); + +static struct rpmsg_driver fastrpc_driver = { + .probe = fastrpc_rpmsg_probe, + .remove = fastrpc_rpmsg_remove, + .callback = fastrpc_rpmsg_callback, + .drv = { + .name = "qcom,fastrpc", + .of_match_table = fastrpc_rpmsg_of_match, + }, +}; + +static int fastrpc_init(void) +{ + int ret; + + ret = platform_driver_register(&fastrpc_cb_driver); + if (ret < 0) { + pr_err("fastrpc: failed to register cb driver\n"); + return ret; + } + + ret = register_rpmsg_driver(&fastrpc_driver); + if (ret < 0) { + pr_err("fastrpc: failed to register rpmsg driver\n"); + platform_driver_unregister(&fastrpc_cb_driver); + return ret; + } + + return 0; +} +module_init(fastrpc_init); + +static void fastrpc_exit(void) +{ + platform_driver_unregister(&fastrpc_cb_driver); + unregister_rpmsg_driver(&fastrpc_driver); +} +module_exit(fastrpc_exit); + +MODULE_ALIAS("fastrpc:fastrpc"); +MODULE_LICENSE("GPL v2");