From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42D09C4332F for ; Mon, 21 Nov 2022 17:49:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230246AbiKURtp (ORCPT ); Mon, 21 Nov 2022 12:49:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230072AbiKURtn (ORCPT ); Mon, 21 Nov 2022 12:49:43 -0500 Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A464AD0DD4 for ; Mon, 21 Nov 2022 09:49:41 -0800 (PST) Received: by mail-pj1-x1029.google.com with SMTP id a1-20020a17090abe0100b00218a7df7789so3904718pjs.5 for ; Mon, 21 Nov 2022 09:49:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=3GS4S6TK9ac+mMV5RelWbqbejWqPaxMDtgoM0e09ufE=; b=K23iT4uUhWXdisaeHFsXa5oP4XerhQHl6k5ONgw0ex5HM7DXTbrXRzzW/QOn1enhdn aqZd9nbAxgrRHvP3P1oKQjKiQDmsTwBV0ChQ6zyT8YudUQfaeC4CEm8OPw2nIYmPmAKR 90XBQFi9W7++dakVIep33AuUDrZWTaNSOW+l7jiB0kl8kmuHIp4qd1n16dL/erS1sHZy aQdsmhCWAW4T24VYjTnv7jkZukRbScvkvqV5LmPP01vbcwg74ZwHSI6adPMohe4MOlK0 RtxbCeXQzySSGrnZhOsIBfGK65JpiiYd03I65nHqLKSq9UtdIhEu25Yj/QfjmxluMkHh 9G+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=3GS4S6TK9ac+mMV5RelWbqbejWqPaxMDtgoM0e09ufE=; b=e01jAn8dGF2gDO1+Br2NiFFVNL4aVfv8gYWkh9de9Uh0BKgnVNEQv8VDcEKBwp3L0S fG8DHGNFt939uTHcaZ6hlbBYmXY73goV4I22AU9/IoZmvIvs0HXR3TahAHXnicG8wuUs MMRm5SUIfOuxdWipPw3mhIEKQYxoARexXCvzqKcM5IMVpOY/7Zkrb5ulmYd/4vYKyfp0 ejnwsgTzmZEj5Em1RUk6dUl1nhxveArYG8pGkNKmX0XYSCRRkrGxgjErUOPH+IH+WduD //wUQRLWnpkXYwmU1QvCWcG9u/GMl0dR+ADD64MDbPMBZDgwH+P5AWx5iqEY3ZisVnhP 10DQ== X-Gm-Message-State: ANoB5pl/C3V8ckeo5ExssvBIxwXY0gWQOOu2MLchI2pkyqPhy9PDC5kq bUTPJUcmznjMno7bnIOk66QeBg== X-Google-Smtp-Source: AA0mqf7CRF91FsB17zC2mNmIoKsJZALDQyU/dQMgOu4ner59ZioiocUvdgIdRd7o6rlBd51scxg5/Q== X-Received: by 2002:a17:902:a511:b0:174:7d26:812f with SMTP id s17-20020a170902a51100b001747d26812fmr445499plq.63.1669052981121; Mon, 21 Nov 2022 09:49:41 -0800 (PST) Received: from p14s ([2604:3d09:148c:c800:8b90:bf06:8462:1d8b]) by smtp.gmail.com with ESMTPSA id x187-20020a6231c4000000b0056bc30e618dsm9026287pfx.38.2022.11.21.09.49.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Nov 2022 09:49:40 -0800 (PST) Date: Mon, 21 Nov 2022 10:49:38 -0700 From: Mathieu Poirier To: MD Danish Anwar Cc: Krzysztof Kozlowski , Rob Herring , Suman Anna , Roger Quadros , "Andrew F . Davis" , nm@ti.com, vigneshr@ti.com, srk@ti.com, linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v9 2/6] remoteproc: pru: Add APIs to get and put the PRU cores Message-ID: <20221121174938.GC457869@p14s> References: <20221118111924.3277838-1-danishanwar@ti.com> <20221118111924.3277838-3-danishanwar@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20221118111924.3277838-3-danishanwar@ti.com> Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Fri, Nov 18, 2022 at 04:49:20PM +0530, MD Danish Anwar wrote: > From: Tero Kristo > > Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU > driver to allow client drivers to acquire and release the remoteproc > device associated with a PRU core. The PRU cores are treated as > resources with only one client owning it at a time. > > The pru_rproc_get() function returns the rproc handle corresponding > to a PRU core identified by the device tree "ti,prus" property under > the client node. The pru_rproc_put() is the complementary function > to pru_rproc_get(). > > Signed-off-by: Suman Anna > Signed-off-by: Tero Kristo > Signed-off-by: Grzegorz Jaszczyk > Signed-off-by: MD Danish Anwar > --- > drivers/remoteproc/pru_rproc.c | 134 ++++++++++++++++++++++++++++++++- > include/linux/pruss.h | 47 ++++++++++++ > 2 files changed, 179 insertions(+), 2 deletions(-) > create mode 100644 include/linux/pruss.h > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > index 128bf9912f2c..4769ade9c316 100644 > --- a/drivers/remoteproc/pru_rproc.c > +++ b/drivers/remoteproc/pru_rproc.c > @@ -2,12 +2,14 @@ > /* > * PRU-ICSS remoteproc driver for various TI SoCs > * > - * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/ > + * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/ > * > * Author(s): > * Suman Anna > * Andrew F. Davis > * Grzegorz Jaszczyk for Texas Instruments > + * Puranjay Mohan > + * Md Danish Anwar > */ > > #include > @@ -16,6 +18,7 @@ > #include > #include > #include > +#include > #include > #include > > @@ -111,6 +114,8 @@ struct pru_private_data { > * @rproc: remoteproc pointer for this PRU core > * @data: PRU core specific data > * @mem_regions: data for each of the PRU memory regions > + * @client_np: client device node > + * @lock: mutex to protect client usage > * @fw_name: name of firmware image used during loading > * @mapped_irq: virtual interrupt numbers of created fw specific mapping > * @pru_interrupt_map: pointer to interrupt mapping description (firmware) > @@ -126,6 +131,8 @@ struct pru_rproc { > struct rproc *rproc; > const struct pru_private_data *data; > struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; > + struct device_node *client_np; > + struct mutex lock; > const char *fw_name; > unsigned int *mapped_irq; > struct pru_irq_rsc *pru_interrupt_map; > @@ -146,6 +153,125 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val) > writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg); > } > > +static struct rproc *__pru_rproc_get(struct device_node *np, int index) > +{ > + struct rproc *rproc; > + phandle rproc_phandle; > + int ret; > + > + ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle); > + if (ret) > + return ERR_PTR(ret); > + > + rproc = rproc_get_by_phandle(rproc_phandle); > + if (!rproc) { > + ret = -EPROBE_DEFER; > + goto err_no_rproc_handle; > + } > + > + /* make sure it is PRU rproc */ > + if (!is_pru_rproc(rproc->dev.parent)) { > + rproc_put(rproc); > + return ERR_PTR(-ENODEV); > + } > + > + return rproc; > + > +err_no_rproc_handle: > + rproc_put(rproc); > + return ERR_PTR(ret); > +} > + > +/** > + * pru_rproc_get() - get the PRU rproc instance from a device node > + * @np: the user/client device node > + * @index: index to use for the ti,prus property > + * @pru_id: optional pointer to return the PRU remoteproc processor id > + * > + * This function looks through a client device node's "ti,prus" property at > + * index @index and returns the rproc handle for a valid PRU remote processor if > + * found. The function allows only one user to own the PRU rproc resource at a > + * time. Caller must call pru_rproc_put() when done with using the rproc, not > + * required if the function returns a failure. > + * > + * When optional @pru_id pointer is passed the PRU remoteproc processor id is > + * returned. > + * > + * Return: rproc handle on success, and an ERR_PTR on failure using one > + * of the following error values > + * -ENODEV if device is not found > + * -EBUSY if PRU is already acquired by anyone > + * -EPROBE_DEFER is PRU device is not probed yet > + */ > +struct rproc *pru_rproc_get(struct device_node *np, int index, > + enum pruss_pru_id *pru_id) > +{ > + struct rproc *rproc; > + struct pru_rproc *pru; > + struct device *dev; > + int ret; > + > + rproc = __pru_rproc_get(np, index); > + if (IS_ERR(rproc)) > + return rproc; > + > + pru = rproc->priv; > + dev = &rproc->dev; > + > + mutex_lock(&pru->lock); > + > + if (pru->client_np) { > + mutex_unlock(&pru->lock); > + put_device(dev); > + ret = -EBUSY; > + goto err_no_rproc_handle; > + } > + > + pru->client_np = np; > + > + mutex_unlock(&pru->lock); > + > + if (pru_id) > + *pru_id = pru->id; > + > + return rproc; > + > +err_no_rproc_handle: > + rproc_put(rproc); > + return ERR_PTR(ret); > +} > +EXPORT_SYMBOL_GPL(pru_rproc_get); > + > +/** > + * pru_rproc_put() - release the PRU rproc resource > + * @rproc: the rproc resource to release > + * > + * Releases the PRU rproc resource and makes it available to other > + * users. > + */ > +void pru_rproc_put(struct rproc *rproc) > +{ > + struct pru_rproc *pru; > + > + if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent)) > + return; > + > + pru = rproc->priv; > + > + mutex_lock(&pru->lock); > + > + if (!pru->client_np) { > + mutex_unlock(&pru->lock); > + return; > + } > + > + pru->client_np = NULL; > + mutex_unlock(&pru->lock); > + > + rproc_put(rproc); > +} > +EXPORT_SYMBOL_GPL(pru_rproc_put); > + > static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg) > { > return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg); > @@ -816,6 +942,8 @@ static int pru_rproc_probe(struct platform_device *pdev) > pru->pruss = platform_get_drvdata(ppdev); > pru->rproc = rproc; > pru->fw_name = fw_name; > + pru->client_np = NULL; > + mutex_init(&pru->lock); > > for (i = 0; i < ARRAY_SIZE(mem_names); i++) { > res = platform_get_resource_byname(pdev, IORESOURCE_MEM, > @@ -904,7 +1032,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match); > > static struct platform_driver pru_rproc_driver = { > .driver = { > - .name = "pru-rproc", > + .name = PRU_RPROC_DRVNAME, > .of_match_table = pru_rproc_match, > .suppress_bind_attrs = true, > }, > @@ -916,5 +1044,7 @@ module_platform_driver(pru_rproc_driver); > MODULE_AUTHOR("Suman Anna "); > MODULE_AUTHOR("Andrew F. Davis "); > MODULE_AUTHOR("Grzegorz Jaszczyk "); > +MODULE_AUTHOR("Puranjay Mohan "); > +MODULE_AUTHOR("Md Danish Anwar "); > MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver"); > MODULE_LICENSE("GPL v2"); > diff --git a/include/linux/pruss.h b/include/linux/pruss.h > new file mode 100644 > index 000000000000..4909226f14a9 > --- /dev/null > +++ b/include/linux/pruss.h > @@ -0,0 +1,47 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/** > + * PRU-ICSS Subsystem user interfaces > + * > + * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com > + * Suman Anna > + */ > + > +#ifndef __LINUX_PRUSS_H > +#define __LINUX_PRUSS_H > + > +#include > +#include > + > +#define PRU_RPROC_DRVNAME "pru-rproc" > + > +struct device_node; > + > +#if IS_ENABLED(CONFIG_PRU_REMOTEPROC) > + > +struct rproc *pru_rproc_get(struct device_node *np, int index, > + enum pruss_pru_id *pru_id); Did you really send me code that doesn't compile? It sure looks that way... CC drivers/remoteproc/pru_rproc.o In file included from /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:21: /home/mpoirier/work/remoteproc/kernel-review/include/linux/pruss.h:22:13: warning: ‘enum pruss_pru_id’ declared inside parameter list will not be visible outside of this definition or declaration 22 | enum pruss_pru_id *pru_id); | ^~~~~~~~~~~~ /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:207:13: warning: ‘enum pruss_pru_id’ declared inside parameter list will not be visible outside of this definition or declaration 207 | enum pruss_pru_id *pru_id) | ^~~~~~~~~~~~ /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:206:15: error: conflicting types for ‘pru_rproc_get’ 206 | struct rproc *pru_rproc_get(struct device_node *np, int index, | ^~~~~~~~~~~~~ In file included from /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:21: /home/mpoirier/work/remoteproc/kernel-review/include/linux/pruss.h:21:15: note: previous declaration of ‘pru_rproc_get’ was here 21 | struct rproc *pru_rproc_get(struct device_node *np, int index, | ^~~~~~~~~~~~~ /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c: In function ‘pru_rproc_get’: /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:235:3: error: dereferencing pointer to incomplete type ‘enum pruss_pru_id’ 235 | *pru_id = pru->id; | ^~~~~~~ In file included from /home/mpoirier/work/remoteproc/kernel-review/include/linux/linkage.h:7, from /home/mpoirier/work/remoteproc/kernel-review/include/linux/fs.h:5, from /home/mpoirier/work/remoteproc/kernel-review/include/linux/debugfs.h:15, from /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:16: /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c: At top level: /home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:243:19: error: conflicting types for ‘pru_rproc_get’ 243 | EXPORT_SYMBOL_GPL(pru_rproc_get); > +void pru_rproc_put(struct rproc *rproc); > + > +#else > + > +static inline struct rproc * > +pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id) > +{ > + return ERR_PTR(-EOPNOTSUPP); > +} > + > +static inline void pru_rproc_put(struct rproc *rproc) { } > + > +#endif /* CONFIG_PRU_REMOTEPROC */ > + > +static inline bool is_pru_rproc(struct device *dev) > +{ > + const char *drv_name = dev_driver_string(dev); > + > + if (strncmp(drv_name, PRU_RPROC_DRVNAME, sizeof(PRU_RPROC_DRVNAME))) > + return false; > + > + return true; > +} > + > +#endif /* __LINUX_PRUSS_H */ > -- > 2.25.1 >