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Message-Id: <20231104064650.972687-3-zhangxiaoxu@huaweicloud.com>
Date: Sat, 4 Nov 2023 14:46:47 +0800
From: Zhang Xiaoxu <zhangxiaoxu@...weicloud.com>
To: zhangxiaoxu5@...wei.com, weiyongjun1@...wei.com,
broonie@...nel.org, rostedt@...dmis.org, mingo@...hat.com,
frowand.list@...il.com, linux-spi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 -next 2/5] spi: mockup: Add writeable tracepoint for spi transfer
From: Zhang Xiaoxu <zhangxiaoxu5@...wei.com>
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 <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
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 <weiyongjun1@...wei.com>
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@...wei.com>
---
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 9169081cfecb..871e3824b8eb 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -1221,6 +1221,7 @@ 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 683a0fc43f0d..fcaaa61bdb38 100644
--- a/drivers/spi/spi-mockup.c
+++ b/drivers/spi/spi-mockup.c
@@ -13,6 +13,9 @@
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/spi_mockup.h>
+
#define MOCKUP_CHIPSELECT_MAX 8
struct mockup_spi {
@@ -149,13 +152,58 @@ 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 <linux/tracepoint.h>
+#include <linux/spi/spi-mockup.h>
+
+#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 <trace/define_trace.h>
--
2.34.1
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