From patchwork Wed Jul 26 15:08:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Xiaoxu X-Patchwork-Id: 13327535 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 72797C41513 for ; Wed, 26 Jul 2023 07:14:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232460AbjGZHOl (ORCPT ); Wed, 26 Jul 2023 03:14:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232132AbjGZHON (ORCPT ); Wed, 26 Jul 2023 03:14:13 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9CED2D42; Wed, 26 Jul 2023 00:10:32 -0700 (PDT) Received: from dggpeml100024.china.huawei.com (unknown [172.30.72.57]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4R9lMG6mlqzCrW0; Wed, 26 Jul 2023 15:07:06 +0800 (CST) Received: from china (10.175.101.107) by dggpeml100024.china.huawei.com (7.185.36.115) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Wed, 26 Jul 2023 15:10:29 +0800 From: Zhang Xiaoxu To: , , , CC: , , , Subject: [PATCH v2 -next 2/3] spi: mockup: Add writeable tracepoint for spi transfer Date: Wed, 26 Jul 2023 15:08:48 +0000 Message-ID: <20230726150849.28407-3-zhangxiaoxu5@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230726150849.28407-1-zhangxiaoxu5@huawei.com> References: <20230726150849.28407-1-zhangxiaoxu5@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.107] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpeml100024.china.huawei.com (7.185.36.115) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org From: Wei Yongjun Add writeable tracepoint for transfer_one_message(), then bpf program can be used to control read and write data from spi host, as mockup chip's expectation. For example: #include "vmlinux.h" #include #include SEC("raw_tp.w/spi_transfer_writeable") int BPF_PROG(spi_transfer_writeable_test, struct spi_msg_ctx *msg, u8 chip, unsigned int len) { if (msg->tx_nbits) msg->data[0] = 0x20; return 0; } char LICENSE[] SEC("license") = "GPL"; This will be useful for writing spi device mockup backend. Signed-off-by: Wei Yongjun Signed-off-by: Zhang Xiaoxu --- drivers/spi/Kconfig | 1 + drivers/spi/spi-mockup.c | 52 +++++++++++++++++++++++++++++-- include/linux/spi/spi-mockup.h | 17 ++++++++++ include/trace/events/spi_mockup.h | 31 ++++++++++++++++++ 4 files changed, 99 insertions(+), 2 deletions(-) create mode 100644 include/linux/spi/spi-mockup.h create mode 100644 include/trace/events/spi_mockup.h diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 1768e57f0088..608e224e52ef 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -1188,6 +1188,7 @@ config SPI_TLE62X0 config SPI_MOCKUP tristate "SPI controller Testing Driver" depends on OF + select BPF_EVENTS help This enables SPI controller testing driver, which provides a way to test SPI subsystem. diff --git a/drivers/spi/spi-mockup.c b/drivers/spi/spi-mockup.c index 4debfd1fb9fd..3835012e2ee8 100644 --- a/drivers/spi/spi-mockup.c +++ b/drivers/spi/spi-mockup.c @@ -14,6 +14,9 @@ #include #include +#define CREATE_TRACE_POINTS +#include + #define MOCKUP_CHIPSELECT_MAX 8 struct mockup_spi { @@ -150,13 +153,58 @@ static struct attribute *spi_mockup_attrs[] = { }; ATTRIBUTE_GROUPS(spi_mockup); +static int spi_mockup_transfer_writeable(struct spi_message *msg) +{ + struct spi_msg_ctx *ctx; + struct spi_transfer *t; + int ret = 0; + + ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); + if (!ctx) + return -ENOMEM; + + list_for_each_entry(t, &msg->transfers, transfer_list) { + if (t->len > SPI_BUFSIZ_MAX) + return -E2BIG; + + memset(ctx, 0, sizeof(*ctx)); + ctx->cs_off = t->cs_off; + ctx->cs_change = t->cs_change; + ctx->tx_nbits = t->tx_nbits; + ctx->rx_nbits = t->rx_nbits; + + if (t->tx_nbits) + memcpy(ctx->data, t->tx_buf, t->len); + + trace_spi_transfer_writeable(ctx, msg->spi->chip_select, t->len); + + if (ctx->ret) { + ret = ctx->ret; + break; + } + + if (t->rx_nbits) + memcpy(t->rx_buf, ctx->data, t->len); + msg->actual_length += t->len; + } + + kfree(ctx); + + return ret; +} + static int spi_mockup_transfer(struct spi_controller *ctrl, struct spi_message *msg) { - msg->status = 0; + int ret = 0; + + if (trace_spi_transfer_writeable_enabled()) + ret = spi_mockup_transfer_writeable(msg); + + msg->status = ret; spi_finalize_current_message(ctrl); - return 0; + return ret; } static int spi_mockup_probe(struct platform_device *pdev) diff --git a/include/linux/spi/spi-mockup.h b/include/linux/spi/spi-mockup.h new file mode 100644 index 000000000000..224894b416fb --- /dev/null +++ b/include/linux/spi/spi-mockup.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __LINUX_SPI_MOCKUP_H +#define __LINUX_SPI_MOCKUP_H + +#define SPI_BUFSIZ_MAX 0x1000 + +struct spi_msg_ctx { + int ret; + unsigned cs_off:1; + unsigned cs_change:1; + unsigned tx_nbits:3; + unsigned rx_nbits:3; + __u8 data[SPI_BUFSIZ_MAX]; +}; + +#endif diff --git a/include/trace/events/spi_mockup.h b/include/trace/events/spi_mockup.h new file mode 100644 index 000000000000..46debf26a5e3 --- /dev/null +++ b/include/trace/events/spi_mockup.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * SPI mockup controller transfer writeable tracepoint + * + * Copyright(c) 2022 Huawei Technologies Co., Ltd. + */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM spi_mockup + +#if !defined(_TRACE_SPI_MOCKUP_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_SPI_MOCKUP_H + +#include +#include + +#ifndef DECLARE_TRACE_WRITABLE +#define DECLARE_TRACE_WRITABLE(call, proto, args, size) \ + DECLARE_TRACE(call, PARAMS(proto), PARAMS(args)) +#endif + +DECLARE_TRACE_WRITABLE(spi_transfer_writeable, + TP_PROTO(struct spi_msg_ctx *msg, u8 chip_select, unsigned int len), + TP_ARGS(msg, chip_select, len), + sizeof(struct spi_msg_ctx) +); + +#endif /* _TRACE_SPI_MOCKUP_H */ + +/* This part must be outside protection */ +#include