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Message-ID: <2fb8fdf1-b945-4801-b947-7e824146f978@linaro.org>
Date: Tue, 21 May 2024 09:32:48 +0200
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From: Neil Armstrong <neil.armstrong@linaro.org>
Reply-To: neil.armstrong@linaro.org
Subject: Re: [PATCH v4 2/4] soc: amlogic: meson-gx-socinfo-sm: Add Amlogic
 secure-monitor SoC Information driver
To: Viacheslav Bocharov <adeep@lexina.in>, Kevin Hilman
 <khilman@baylibre.com>, Jerome Brunet <jbrunet@baylibre.com>,
 Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
 linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-amlogic@lists.infradead.org
Cc: Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
References: <20240516112849.3803674-2-adeep@lexina.in>
 <20240516112849.3803674-5-adeep@lexina.in>
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Organization: Linaro
In-Reply-To: <20240516112849.3803674-5-adeep@lexina.in>
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HI,

On 16/05/2024 13:26, Viacheslav Bocharov wrote:
> Amlogic SoCs have a SoC information secure-monitor call for SoC type,
> package type, revision information and chipid.
> This patchs adds support for secure-monitor call decoding and exposing
> with the SoC bus infrastructure in addition to the previous SoC
> Information driver.
> 
> Signed-off-by: Viacheslav Bocharov <adeep@lexina.in>
> ---
>   drivers/soc/amlogic/Kconfig               |  10 ++
>   drivers/soc/amlogic/Makefile              |   1 +
>   drivers/soc/amlogic/meson-gx-socinfo-sm.c | 189 ++++++++++++++++++++++
>   3 files changed, 200 insertions(+)
>   create mode 100644 drivers/soc/amlogic/meson-gx-socinfo-sm.c
> 
> diff --git a/drivers/soc/amlogic/Kconfig b/drivers/soc/amlogic/Kconfig
> index d08e398bdad4..82fc77ca3b4b 100644
> --- a/drivers/soc/amlogic/Kconfig
> +++ b/drivers/soc/amlogic/Kconfig
> @@ -26,6 +26,16 @@ config MESON_GX_SOCINFO
>   	  Say yes to support decoding of Amlogic Meson GX SoC family
>   	  information about the type, package and version.
>   
> +config MESON_GX_SOCINFO_SM
> +	bool "Amlogic Meson GX SoC Information driver via Secure Monitor"
> +	depends on (ARM64 && ARCH_MESON || COMPILE_TEST) && MESON_SM=y
> +	default ARCH_MESON && MESON_SM
> +	select SOC_BUS
> +	help
> +	  Say yes to support decoding of Amlogic Meson GX SoC family
> +	  information about the type, package and version via secure
> +	  monitor call.
> +
>   config MESON_MX_SOCINFO
>   	bool "Amlogic Meson MX SoC Information driver"
>   	depends on (ARM && ARCH_MESON) || COMPILE_TEST
> diff --git a/drivers/soc/amlogic/Makefile b/drivers/soc/amlogic/Makefile
> index c25f835e6a26..45d9d6f5904c 100644
> --- a/drivers/soc/amlogic/Makefile
> +++ b/drivers/soc/amlogic/Makefile
> @@ -2,4 +2,5 @@
>   obj-$(CONFIG_MESON_CANVAS) += meson-canvas.o
>   obj-$(CONFIG_MESON_CLK_MEASURE) += meson-clk-measure.o
>   obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
> +obj-$(CONFIG_MESON_GX_SOCINFO_SM) += meson-gx-socinfo-sm.o
>   obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o
> diff --git a/drivers/soc/amlogic/meson-gx-socinfo-sm.c b/drivers/soc/amlogic/meson-gx-socinfo-sm.c
> new file mode 100644
> index 000000000000..22acd92bb830
> --- /dev/null
> +++ b/drivers/soc/amlogic/meson-gx-socinfo-sm.c
> @@ -0,0 +1,189 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2017 BayLibre, SAS
> + * Copyright (c) 2024 JetHome
> + * Author: Neil Armstrong <neil.armstrong@linaro.org>
> + * Author: Viacheslav Bocharov <adeep@lexina.in>
> + *
> + */
> +
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/sys_soc.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +#include <linux/firmware/meson/meson_sm.h>
> +
> +#include "meson-gx-socinfo-internal.h"
> +
> +static char *socinfo_get_chipid(struct device *dev, struct meson_sm_firmware *fw,
> +			       union meson_cpu_id *socinfo)
> +{
> +	char *buf;
> +	struct meson_sm_chip_id *id_buf;
> +	int ret;
> +
> +	id_buf = kzalloc(sizeof(struct meson_sm_chip_id)+1, GFP_KERNEL);
> +	if (!id_buf)
> +		return NULL;
> +
> +	ret = meson_sm_call_read(fw, id_buf, sizeof(struct meson_sm_chip_id), SM_GET_CHIP_ID,
> +				 2, 0, 0, 0, 0);
> +	if (ret < 0) {
> +		kfree(id_buf);
> +		return NULL;
> +	}
> +	dev_info(dev, "got sm version call %i\n", id_buf->version);
> +
> +	if (id_buf->version != 2) {
> +
> +		u8 tmp;
> +		/**
> +		 * Legacy 12-byte chip ID read out, transform data
> +		 * to expected order format
> +		 */
> +		memmove((void *)&id_buf->serial, (void *)&id_buf->cpu_id, 12);
> +		for (int i = 0; i < 6; i++) {
> +			tmp = id_buf->serial[i];
> +			id_buf->serial[i] = id_buf->serial[11 - i];
> +			id_buf->serial[11 - i] = tmp;
> +		}
> +		id_buf->cpu_id.v2.major_id = socinfo->v1.major_id;
> +		id_buf->cpu_id.v2.pack_id = socinfo->v1.pack_id;
> +		id_buf->cpu_id.v2.chip_rev = socinfo->v1.chip_rev;
> +		id_buf->cpu_id.v2.reserved = socinfo->v1.reserved;
> +		id_buf->cpu_id.v2.layout_ver = socinfo->v1.layout_ver;
> +	} else {
> +		/**
> +		 * rewrite socinfo from regmap with value from secure monitor call
> +		 */
> +		socinfo->v1.major_id = id_buf->cpu_id.v2.major_id;
> +		socinfo->v1.pack_id = id_buf->cpu_id.v2.pack_id;
> +		socinfo->v1.chip_rev = id_buf->cpu_id.v2.chip_rev;
> +		socinfo->v1.reserved = id_buf->cpu_id.v2.reserved;
> +		socinfo->v1.layout_ver = id_buf->cpu_id.v2.layout_ver;
> +	}
> +
> +	buf = kasprintf(GFP_KERNEL, "%4phN%12phN", &(id_buf->cpu_id), &(id_buf->serial));
> +
> +	kfree(id_buf);
> +
> +	return buf;
> +}
> +
> +static int meson_gx_socinfo_sm_probe(struct platform_device *pdev)
> +{
> +	struct soc_device_attribute *soc_dev_attr;
> +	struct soc_device *soc_dev;
> +	struct device_node *sm_np;
> +	struct meson_sm_firmware *fw;
> +	struct regmap *regmap;
> +	union meson_cpu_id socinfo;
> +	struct device *dev;
> +	int ret;
> +
> +	/* check if chip-id is available */
> +	if (!of_property_read_bool(pdev->dev.of_node, "amlogic,has-chip-id"))
> +		return -ENODEV;
> +
> +	/* node should be a syscon */
> +	regmap = syscon_node_to_regmap(pdev->dev.of_node);
> +	if (IS_ERR(regmap))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(regmap), "failed to get regmap\n");
> +
> +	sm_np = of_parse_phandle(pdev->dev.of_node, "secure-monitor", 0);
> +	if (!sm_np) {
> +		dev_err(&pdev->dev, "no secure-monitor node found\n");
> +		return -EINVAL;
> +	}
> +
> +	fw = meson_sm_get(sm_np);
> +	of_node_put(sm_np);
> +	if (!fw) {
> +		dev_dbg(&pdev->dev, "secure-monitor device not ready, probe later\n");
> +		return -EPROBE_DEFER;
> +	}
> +
> +	ret = regmap_read(regmap, AO_SEC_SOCINFO_OFFSET, &socinfo.raw);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (!socinfo.raw) {
> +		dev_err(&pdev->dev, "invalid regmap chipid value\n");
> +		return -EINVAL;
> +	}
> +
> +	soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
> +				    GFP_KERNEL);
> +	if (!soc_dev_attr)
> +		return -ENOMEM;
> +
> +	soc_dev_attr->serial_number = socinfo_get_chipid(&pdev->dev, fw, &socinfo);
> +
> +	soc_dev_attr->family = "Amlogic Meson";
> +	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%x:%x - %x:%x",
> +					   socinfo.v1.major_id,
> +					   socinfo.v1.chip_rev,
> +					   socinfo.v1.pack_id,
> +					   (socinfo.v1.reserved<<4) + socinfo.v1.layout_ver);
> +	soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%s (%s)",
> +					 socinfo_v1_to_soc_id(socinfo),
> +					 socinfo_v1_to_package_id(socinfo));
> +
> +	soc_dev = soc_device_register(soc_dev_attr);
> +
> +
> +	if (IS_ERR(soc_dev)) {
> +		kfree(soc_dev_attr->revision);
> +		kfree_const(soc_dev_attr->soc_id);
> +		return PTR_ERR(soc_dev);
> +	}
> +
> +	dev = soc_device_to_device(soc_dev);
> +	platform_set_drvdata(pdev, soc_dev);
> +
> +	dev_info(dev, "Amlogic Meson %s Revision %x:%x (%x:%x) Detected (SM)\n",
> +			soc_dev_attr->soc_id,
> +			socinfo.v1.major_id,
> +			socinfo.v1.chip_rev,
> +			socinfo.v1.pack_id,
> +			(socinfo.v1.reserved<<4) + socinfo.v1.layout_ver);
> +
> +	return PTR_ERR_OR_ZERO(dev);
> +}
> +
> +
> +static int meson_gx_socinfo_sm_remove(struct platform_device *pdev)
> +{
> +	struct soc_device *soc_dev = platform_get_drvdata(pdev);
> +
> +	soc_device_unregister(soc_dev);
> +	return 0;
> +}
> +
> +static const struct of_device_id meson_gx_socinfo_match[] = {
> +	{ .compatible = "amlogic,meson-gx-ao-secure", },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, meson_gx_socinfo_match);
> +
> +static struct platform_driver meson_gx_socinfo_driver = {
> +	.probe = meson_gx_socinfo_sm_probe,
> +	.remove	= meson_gx_socinfo_sm_remove,
> +	.driver = {
> +		.name = "meson-gx-socinfo-sm",
> +		.of_match_table = meson_gx_socinfo_match,
> +	},
> +};
> +
> +
> +module_platform_driver(meson_gx_socinfo_driver);
> +
> +MODULE_AUTHOR("Viacheslav Bocharov <adeep@lexina.in>");
> +MODULE_DESCRIPTION("Amlogic Meson GX SOC SM driver");
> +MODULE_LICENSE("GPL");

I get this while building :
In file included from ./include/linux/string.h:374,
                  from ./include/linux/bitmap.h:13,
                  from ./include/linux/cpumask.h:13,
                  from ./arch/arm64/include/asm/cpufeature.h:27,
                  from ./arch/arm64/include/asm/ptrace.h:11,
                  from ./arch/arm64/include/asm/irqflags.h:9,
                  from ./include/linux/irqflags.h:18,
                  from ./include/linux/spinlock.h:59,
                  from ./include/linux/kref.h:16,
                  from ./include/linux/mm_types.h:8,
                  from ./include/linux/page-flags.h:13,
                  from ./arch/arm64/include/asm/mte.h:15,
                  from ./arch/arm64/include/asm/pgtable.h:12,
                  from ./include/linux/pgtable.h:6,
                  from ./arch/arm64/include/asm/io.h:12,
                  from ./include/linux/io.h:14,
                  from drivers/soc/amlogic/meson-gx-socinfo-sm.c:10:
In function ‘fortify_memcpy_chk’,
     inlined from ‘socinfo_get_chipid’ at drivers/soc/amlogic/meson-gx-socinfo-sm.c:50:3:
/include/linux/fortify-string.h:566:25: error: call to ‘__read_overflow2_field’ declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror=attribute-warning]
   566 |                         __read_overflow2_field(q_size_field, size);
       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Neil