From patchwork Fri Nov 15 20:18:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Lechner X-Patchwork-Id: 13876758 Received: from mail-oo1-f50.google.com (mail-oo1-f50.google.com [209.85.161.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D0461D88D7 for ; Fri, 15 Nov 2024 20:18:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.50 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731701933; cv=none; b=lGMnCKaS7nuP+LLoYbhRr3qWuUtAmPnkgqNJxrW8euEDLeZG7i6u6pN7W4yJrenI2o6rJ8tUpYMaiiCcF7fCqDnAEH05P1SLWtWB+s2BVyNv77yvfKWNnLzaXemD1dY6Cf4lF6Jp3u1MHkYXzv4nUyn5RoISEG/B8ua8vDoQswg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731701933; c=relaxed/simple; bh=TOgkx/m/6FrPpC7rnBHkuU0C5+5RkznAgqFoBKD3ESA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=HmAVwtxK/iHYmFvOm04pgNyHmgVE1Kv1KXVJfJxi8l4o8KuikEUBIhQXsf06Sm1/vPCZ+JrwX6zUlems96fy+AfwJql107QMlbre+yTlHgcoWKbGQRtsJV8s4g3aWX+U/rfQkdKsgxGXoq23FH6C9D2nz2dJijkVBY/s+MyxTIw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com; spf=pass smtp.mailfrom=baylibre.com; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b=rtNuM5JR; arc=none smtp.client-ip=209.85.161.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=baylibre.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b="rtNuM5JR" Received: by mail-oo1-f50.google.com with SMTP id 006d021491bc7-5ee645cf74fso571914eaf.2 for ; Fri, 15 Nov 2024 12:18:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1731701930; x=1732306730; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=A3CE0yheT4DVVry1IgtvS9L1hkM/iTvAih5hXhwRp+I=; b=rtNuM5JRgCZEpNamsauUYR59uY6Y0RXY6f4zloZYI2Mre+8Ks6LQQjz9bmQ1xp6r8c l8G6McpUKvu55X+HpzMDj5xITsF9KUGQRNRme9K0rAu/fpyf7m5oj1yI8z550br/uU1Z bWXTs+PvKWkQGnHyxMWe3ovyCcMeyqhVQ6LBTQUQsSIP3H7uTt80Z5/h2EWmWn2/mEIF uSRXniwKFumkJIBJ0uIMiJ/Tsvg+rNb+BlwRvKG3zTEztCLtKBA/QUaSy0SUEFuxYIjL PeAD9UDm7Oa8yP6g56FvDDjxI03g2YJe/r2uYxON39vJwspgxjNlWLjgf40A+9m+Sfh1 6KmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731701930; x=1732306730; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=A3CE0yheT4DVVry1IgtvS9L1hkM/iTvAih5hXhwRp+I=; b=pvmU6gTBAwByK3NwvR3ESpqnHIrpi80CkDcYomvXwbjo5Xt/wC8k4oPrpPWetn+oZ5 1cDYwNLMtv/Ry9MDjo269Z1AyX6FEHMT3h3Bl66ZuLMfAJnIvG+tutbdtEnxNB0+rBkl MFki3gg6fLIAHXRhG5kzUBjY31hyFe0Ua6dkZSTWWNn0/+5j/vRXzHu4gtIPsEXb0Shb mPov2wTRhgyVaMG3tBBi0fuOh3xD+lIW9XVOW5q0D3gJXHvoaJklwovjE7uyb5DzomP5 q+n+NxBdDT98AOrwuMfAUpD8CiyoEpwvh8+m84UaouMxspo+ajz7CFCooQSwsAHRLqVG ugQA== X-Forwarded-Encrypted: i=1; AJvYcCUE/3XOnVmZv5v4zT1EnZpH4ePK/fX+7J0cSsVP8aXB4TLzM1f9A/E/aeTMLk+ty6W7yMHT5/a1jJg=@vger.kernel.org X-Gm-Message-State: AOJu0YzoLDz/0OV7WuBjrI5XkqTKX6WYZy9x1+nOYoR3q0Oz+fjLN+TJ LwdHr8zYT6PC6pMIBKKI7FpH3TzWrFUtF8W5yT7bq1V0nXxnN6FboyHjHunEHf8= X-Google-Smtp-Source: AGHT+IGYDEqISIJl9ctlQZb+4mYv7YJKqQHrlE6VL4Ec7aVtP9KKyc8lkY2pH9Td0Cs929GYSGBYnA== X-Received: by 2002:a05:6871:5292:b0:287:20ea:2db2 with SMTP id 586e51a60fabf-2962e0369a3mr4342642fac.25.1731701930037; Fri, 15 Nov 2024 12:18:50 -0800 (PST) Received: from [127.0.1.1] (ip98-183-112-25.ok.ok.cox.net. [98.183.112.25]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-71a780ea62esm748978a34.5.2024.11.15.12.18.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Nov 2024 12:18:49 -0800 (PST) From: David Lechner Date: Fri, 15 Nov 2024 14:18:40 -0600 Subject: [PATCH v5 01/16] spi: add basic support for SPI offloading Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241115-dlech-mainline-spi-engine-offload-2-v5-1-bea815bd5ea5@baylibre.com> References: <20241115-dlech-mainline-spi-engine-offload-2-v5-0-bea815bd5ea5@baylibre.com> In-Reply-To: <20241115-dlech-mainline-spi-engine-offload-2-v5-0-bea815bd5ea5@baylibre.com> To: Mark Brown , Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , =?utf-8?q?Nuno_S=C3=A1?= Cc: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Michael Hennerich , Lars-Peter Clausen , David Jander , Martin Sperl , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, linux-pwm@vger.kernel.org, David Lechner X-Mailer: b4 0.14.1 Add the basic infrastructure to support SPI offload providers and consumers. SPI offloading is a feature that allows the SPI controller to perform transfers without any CPU intervention. This is useful, e.g. for high-speed data acquisition. SPI controllers with offload support need to implement the get_offload and put_offload callbacks and can use the devm_spi_offload_alloc() to allocate offload instances. SPI peripheral drivers will call devm_spi_offload_get() to get a reference to the matching offload instance. This offload instance can then be attached to a SPI message to request offloading that message. It is expected that SPI controllers with offload support will check for the offload instance in the SPI message in the ctlr->optimize_message() callback and handle it accordingly. CONFIG_SPI_OFFLOAD is intended to be a select-only option. Both consumer and provider drivers should `select SPI_OFFLOAD` in their Kconfig to ensure that the SPI core is built with offload support. Signed-off-by: David Lechner --- v5 changes: * Don't include linux/property.h (moved to later patch). * Only allocate single offload instance instead of array. * Allocate *priv separately to avoid alignment issues. * Add put_offload() callback instead of assuming devm semantics. * Drop struct spi_offload::spi. It was only being used as a flag. * Don't get/put struct spi_offload::provider_dev. * Add MAINTAINERS entry for me as reviewer for anything related to SPI offload. v4 changes: * SPI offload functions moved to a separate file instead of spi.c (spi.c is already too long). * struct spi_offload and devm_spi_offload_get() are back, similar to but improved over v1. This avoids having to pass the function ID string to every function call and re-lookup the offload instance. * offload message prepare/unprepare functions are removed. Instead the existing optimize/unoptimize functions should be used. Setting spi_message::offload pointer is used as a flag to differentiate between an offloaded message and a regular message. v3 changes: * Minor changes to doc comments. * Changed to use phandle array for spi-offloads. * Changed id to string to make use of spi-offload-names. v2 changes: * This is a rework of "spi: add core support for controllers with offload capabilities" from v1. * The spi_offload_get() function that Nuno didn't like is gone. Instead, there is now a mapping callback that uses the new generic devicetree binding to request resources automatically when a SPI device is probed. * The spi_offload_enable/disable() functions for dealing with hardware triggers are deferred to a separate patch. * This leaves adding spi_offload_prepare/unprepare() which have been reworked to be a bit more robust. --- MAINTAINERS | 6 +++ drivers/spi/Kconfig | 3 ++ drivers/spi/Makefile | 1 + drivers/spi/spi-offload.c | 103 ++++++++++++++++++++++++++++++++++++++++ include/linux/spi/spi-offload.h | 60 +++++++++++++++++++++++ include/linux/spi/spi.h | 18 +++++++ 6 files changed, 191 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index bcc42036d635..75c8ca9a8584 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -22019,6 +22019,12 @@ F: Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml F: drivers/mtd/spi-nor/ F: include/linux/mtd/spi-nor.h +SPI OFFLOAD +R: David Lechner +F: drivers/spi/spi-offload.c +F: include/linux/spi/spi-offload.h +K: spi_offload + SPI SUBSYSTEM M: Mark Brown L: linux-spi@vger.kernel.org diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index f51f9466e518..cdc483b0ec5c 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -55,6 +55,9 @@ config SPI_MEM This extension is meant to simplify interaction with SPI memories by providing a high-level interface to send memory-like commands. +config SPI_OFFLOAD + bool + comment "SPI Master Controller Drivers" config SPI_AIROHA_SNFI diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index aea5e54de195..39025ae5364d 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -10,6 +10,7 @@ ccflags-$(CONFIG_SPI_DEBUG) := -DDEBUG obj-$(CONFIG_SPI_MASTER) += spi.o obj-$(CONFIG_SPI_MEM) += spi-mem.o obj-$(CONFIG_SPI_MUX) += spi-mux.o +obj-$(CONFIG_SPI_OFFLOAD) += spi-offload.o obj-$(CONFIG_SPI_SPIDEV) += spidev.o obj-$(CONFIG_SPI_LOOPBACK_TEST) += spi-loopback-test.o diff --git a/drivers/spi/spi-offload.c b/drivers/spi/spi-offload.c new file mode 100644 index 000000000000..5ded7aecf9fc --- /dev/null +++ b/drivers/spi/spi-offload.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2024 Analog Devices Inc. + * Copyright (C) 2024 BayLibre, SAS + */ + +#define DEFAULT_SYMBOL_NAMESPACE SPI_OFFLOAD + +#include +#include +#include +#include +#include +#include +#include + +struct spi_controller_and_offload { + struct spi_controller *controller; + struct spi_offload *offload; +}; + +/** + * devm_spi_offload_alloc() - Allocate offload instance + * @dev: Device for devm purposes and assigned to &struct spi_offload.provider_dev + * @priv_size: Size of private data to allocate + * + * Offload providers should use this to allocate offload instances. + * + * Return: Pointer to new offload instance or error on failure. + */ +struct spi_offload *devm_spi_offload_alloc(struct device *dev, + size_t priv_size) +{ + struct spi_offload *offload; + void *priv; + + offload = devm_kzalloc(dev, sizeof(*offload), GFP_KERNEL); + if (!offload) + return ERR_PTR(-ENOMEM); + + priv = devm_kzalloc(dev, priv_size, GFP_KERNEL); + if (!priv) + return ERR_PTR(-ENOMEM); + + offload->provider_dev = dev; + offload->priv = priv; + + return offload; +} +EXPORT_SYMBOL_GPL(devm_spi_offload_alloc); + +static void spi_offload_put(void *data) +{ + struct spi_controller_and_offload *resource = data; + + resource->controller->put_offload(resource->offload); + kfree(resource); +} + +/** + * devm_spi_offload_get() - Get an offload instance + * @dev: Device for devm purposes + * @spi: SPI device to use for the transfers + * @config: Offload configuration + * + * Peripheral drivers call this function to get an offload instance that meets + * the requirements specified in @config. If no suitable offload instance is + * available, -ENODEV is returned. + * + * Return: Offload instance or error on failure. + */ +struct spi_offload *devm_spi_offload_get(struct device *dev, + struct spi_device *spi, + const struct spi_offload_config *config) +{ + struct spi_controller_and_offload *resource; + int ret; + + if (!spi || !config) + return ERR_PTR(-EINVAL); + + if (!spi->controller->get_offload) + return ERR_PTR(-ENODEV); + + resource = kzalloc(sizeof(*resource), GFP_KERNEL); + if (!resource) + return ERR_PTR(-ENOMEM); + + resource->controller = spi->controller; + resource->offload = spi->controller->get_offload(spi, config); + ret = PTR_ERR_OR_ZERO(resource->offload); + if (ret) { + kfree(resource); + return ERR_PTR(ret); + } + + ret = devm_add_action_or_reset(dev, spi_offload_put, resource); + if (ret) + return ERR_PTR(ret); + + return resource->offload; +} +EXPORT_SYMBOL_GPL(devm_spi_offload_get); diff --git a/include/linux/spi/spi-offload.h b/include/linux/spi/spi-offload.h new file mode 100644 index 000000000000..81b115fc89bf --- /dev/null +++ b/include/linux/spi/spi-offload.h @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2024 Analog Devices Inc. + * Copyright (C) 2024 BayLibre, SAS + */ + +/* + * SPI Offloading support. + * + * Some SPI controllers support offloading of SPI transfers. Essentially, this + * is the ability for a SPI controller to perform SPI transfers with minimal + * or even no CPU intervention, e.g. via a specialized SPI controller with a + * hardware trigger or via a conventional SPI controller using a non-Linux MCU + * processor core to offload the work. + */ + +#ifndef __LINUX_SPI_OFFLOAD_H +#define __LINUX_SPI_OFFLOAD_H + +#include + +MODULE_IMPORT_NS(SPI_OFFLOAD); + +struct device; +struct spi_device; + +/* Offload can be triggered by external hardware event. */ +#define SPI_OFFLOAD_CAP_TRIGGER BIT(0) +/* Offload can record and then play back TX data when triggered. */ +#define SPI_OFFLOAD_CAP_TX_STATIC_DATA BIT(1) +/* Offload can get TX data from an external stream source. */ +#define SPI_OFFLOAD_CAP_TX_STREAM_DMA BIT(2) +/* Offload can send RX data to an external stream sink. */ +#define SPI_OFFLOAD_CAP_RX_STREAM_DMA BIT(3) + +/** + * struct spi_offload_config - offload configuration + * + * This is used to request an offload with specific configuration. + */ +struct spi_offload_config { + /** @capability_flags: required capabilities. See %SPI_OFFLOAD_CAP_* */ + u32 capability_flags; +}; + +/** + * struct spi_offload - offload instance + */ +struct spi_offload { + /** @provider_dev: for get/put reference counting */ + struct device *provider_dev; + /** @priv: provider driver private data */ + void *priv; +}; + +struct spi_offload *devm_spi_offload_alloc(struct device *dev, size_t priv_size); +struct spi_offload *devm_spi_offload_get(struct device *dev, struct spi_device *spi, + const struct spi_offload_config *config); + +#endif /* __LINUX_SPI_OFFLOAD_H */ diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 8497f4747e24..c2b24a0909ea 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -31,6 +31,9 @@ struct spi_transfer; struct spi_controller_mem_ops; struct spi_controller_mem_caps; struct spi_message; +struct spi_controller_offload_ops; +struct spi_offload; +struct spi_offload_config; /* * INTERFACES between SPI master-side drivers and SPI slave protocol handlers, @@ -496,6 +499,10 @@ extern struct spi_device *spi_new_ancillary_device(struct spi_device *spi, u8 ch * @mem_ops: optimized/dedicated operations for interactions with SPI memory. * This field is optional and should only be implemented if the * controller has native support for memory like operations. + * @get_offload: callback for controllers with offload support to get matching + * offload instance. Implementations should return -ENODEV if no match is + * found. + * @put_offload: release the offload instance acquired by @get_offload. * @mem_caps: controller capabilities for the handling of memory operations. * @unprepare_message: undo any work done by prepare_message(). * @target_abort: abort the ongoing transfer request on an SPI target controller @@ -740,6 +747,10 @@ struct spi_controller { const struct spi_controller_mem_ops *mem_ops; const struct spi_controller_mem_caps *mem_caps; + struct spi_offload *(*get_offload)(struct spi_device *spi, + const struct spi_offload_config *config); + void (*put_offload)(struct spi_offload *offload); + /* GPIO chip select */ struct gpio_desc **cs_gpiods; bool use_gpio_descriptors; @@ -1108,6 +1119,7 @@ struct spi_transfer { * @state: for use by whichever driver currently owns the message * @opt_state: for use by whichever driver currently owns the message * @resources: for resource management when the SPI message is processed + * @offload: (optional) offload instance used by this message * * A @spi_message is used to execute an atomic sequence of data transfers, * each represented by a struct spi_transfer. The sequence is "atomic" @@ -1168,6 +1180,12 @@ struct spi_message { */ void *opt_state; + /* + * Optional offload instance used by this message. This must be set + * by the peripheral driver before calling spi_optimize_message(). + */ + struct spi_offload *offload; + /* List of spi_res resources when the SPI message is processed */ struct list_head resources; };