From: Dmitry Osipenko <digetx@gmail.com>
To: "Jens Axboe" <axboe@kernel.dk>,
"Thierry Reding" <thierry.reding@gmail.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
"David Heidelberg" <david@ixit.cz>,
"Peter Geis" <pgwipeout@gmail.com>,
"Stephen Warren" <swarren@wwwdotorg.org>,
"Nicolas Chauvet" <kwizart@gmail.com>,
"Ulf Hansson" <ulf.hansson@linaro.org>,
"Adrian Hunter" <adrian.hunter@intel.com>,
"Billy Laws" <blaws05@gmail.com>,
"Nils Östlund" <nils@naltan.com>,
"Christoph Hellwig" <hch@infradead.org>,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Davidlohr Bueso" <dave@stgolabs.net>
Cc: linux-tegra@vger.kernel.org, linux-block@vger.kernel.org,
Andrey Danin <danindrey@mail.ru>,
Gilles Grandou <gilles@grandou.net>,
Ryan Grachek <ryan@edited.us>,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Steve McIntyre <steve@einval.com>,
Randy Dunlap <rdunlap@infradead.org>,
linux-efi <linux-efi@vger.kernel.org>
Subject: [PATCH v5 6/6] soc/tegra: Expose Boot Configuration Table via sysfs
Date: Sat, 16 May 2020 18:36:44 +0300 [thread overview]
Message-ID: <20200516153644.13748-7-digetx@gmail.com> (raw)
In-Reply-To: <20200516153644.13748-1-digetx@gmail.com>
It's quite useful to have unencrypted BCT exposed to userspace for
debugging purposes, so let's expose it via sysfs. The BCT data will be
present in '/sys/tegra/boot_config_table' binary file if BCT is available.
Suggested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/mach-tegra/tegra.c | 4 +++
drivers/soc/tegra/Makefile | 1 +
drivers/soc/tegra/bootdata.c | 51 ++++++++++++++++++++++++++++++++++++
drivers/soc/tegra/common.c | 17 ++++++++++++
include/soc/tegra/bootdata.h | 2 ++
include/soc/tegra/common.h | 3 +++
6 files changed, 78 insertions(+)
create mode 100644 drivers/soc/tegra/bootdata.c
diff --git a/arch/arm/mach-tegra/tegra.c b/arch/arm/mach-tegra/tegra.c
index da6bcd85398b..5f40463f1b97 100644
--- a/arch/arm/mach-tegra/tegra.c
+++ b/arch/arm/mach-tegra/tegra.c
@@ -72,6 +72,7 @@ static void __init tegra_boot_config_table_init(void)
u32 iram_end = TEGRA_IRAM_BASE + TEGRA_IRAM_SIZE;
u32 iram_start = TEGRA_IRAM_BASE;
u32 pt_addr, pt_size, bct_size;
+ void __iomem *bct_ptr;
t20_bit = IO_ADDRESS(TEGRA_IRAM_BASE);
@@ -90,6 +91,7 @@ static void __init tegra_boot_config_table_init(void)
pt_addr = t20_bct->partition_table_logical_sector_address;
pt_size = t20_bct->partition_table_num_logical_sectors;
+ bct_ptr = t20_bct;
} else if (of_machine_is_compatible("nvidia,tegra30")) {
bct_size = sizeof(*t30_bct);
@@ -106,12 +108,14 @@ static void __init tegra_boot_config_table_init(void)
pt_addr = t30_bct->partition_table_logical_sector_address;
pt_size = t30_bct->partition_table_num_logical_sectors;
+ bct_ptr = t30_bct;
} else {
return;
}
pr_info("%s: BCT found in IRAM\n", __func__);
+ tegra_bootdata_bct_setup(bct_ptr, bct_size);
tegra_partition_table_setup(pt_addr, pt_size);
}
diff --git a/drivers/soc/tegra/Makefile b/drivers/soc/tegra/Makefile
index 9c809c1814bd..8be2bfb4d95d 100644
--- a/drivers/soc/tegra/Makefile
+++ b/drivers/soc/tegra/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += fuse/
+obj-y += bootdata.o
obj-y += common.o
obj-$(CONFIG_SOC_TEGRA_FLOWCTRL) += flowctrl.o
obj-$(CONFIG_SOC_TEGRA_PMC) += pmc.o
diff --git a/drivers/soc/tegra/bootdata.c b/drivers/soc/tegra/bootdata.c
new file mode 100644
index 000000000000..e18a27b74023
--- /dev/null
+++ b/drivers/soc/tegra/bootdata.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include <soc/tegra/bootdata.h>
+#include <soc/tegra/common.h>
+
+/*
+ * spare_bct[] will be released once kernel is booted, hence not wasting
+ * kernel space if BCT is missing. The tegra_bct can't be allocated during
+ * of BCT setting up because it's too early for the slab allocator.
+ */
+static u8 spare_bct[SZ_8K] __initdata;
+static u8 *tegra_bct;
+
+static ssize_t boot_config_table_read(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ memcpy(buf, tegra_bct + off, count);
+ return count;
+}
+static BIN_ATTR_RO(boot_config_table, 0);
+
+static int __init tegra_bootdata_bct_sysfs_init(void)
+{
+ if (!bin_attr_boot_config_table.size)
+ return 0;
+
+ tegra_bct = kmalloc(GFP_KERNEL, bin_attr_boot_config_table.size);
+ if (!tegra_bct)
+ return -ENOMEM;
+
+ memcpy(tegra_bct, spare_bct, bin_attr_boot_config_table.size);
+
+ return sysfs_create_bin_file(tegra_soc_kobj,
+ &bin_attr_boot_config_table);
+}
+late_initcall(tegra_bootdata_bct_sysfs_init)
+
+void __init tegra_bootdata_bct_setup(void __iomem *bct_ptr, size_t bct_size)
+{
+ memcpy_fromio(spare_bct, bct_ptr, bct_size);
+ bin_attr_boot_config_table.size = bct_size;
+}
diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c
index 3dc54f59cafe..2b4b49eacb2e 100644
--- a/drivers/soc/tegra/common.c
+++ b/drivers/soc/tegra/common.c
@@ -3,10 +3,15 @@
* Copyright (C) 2014 NVIDIA CORPORATION. All rights reserved.
*/
+#include <linux/init.h>
+#include <linux/kernel.h>
#include <linux/of.h>
+#include <linux/sysfs.h>
#include <soc/tegra/common.h>
+struct kobject *tegra_soc_kobj;
+
static const struct of_device_id tegra_machine_match[] = {
{ .compatible = "nvidia,tegra20", },
{ .compatible = "nvidia,tegra30", },
@@ -31,3 +36,15 @@ bool soc_is_tegra(void)
return match != NULL;
}
+
+static int __init tegra_soc_sysfs_init(void)
+{
+ if (!soc_is_tegra())
+ return 0;
+
+ tegra_soc_kobj = kobject_create_and_add("tegra", NULL);
+ WARN_ON(!tegra_soc_kobj);
+
+ return 0;
+}
+arch_initcall(tegra_soc_sysfs_init)
diff --git a/include/soc/tegra/bootdata.h b/include/soc/tegra/bootdata.h
index 7be207cb2519..d5c7a251517d 100644
--- a/include/soc/tegra/bootdata.h
+++ b/include/soc/tegra/bootdata.h
@@ -43,4 +43,6 @@ struct tegra30_boot_config_table {
u32 unused_data[3];
} __packed;
+void tegra_bootdata_bct_setup(void __iomem *bct_ptr, size_t bct_size);
+
#endif /* __SOC_TEGRA_BOOTDATA_H__ */
diff --git a/include/soc/tegra/common.h b/include/soc/tegra/common.h
index 744280ecab5f..0bc11b45c98e 100644
--- a/include/soc/tegra/common.h
+++ b/include/soc/tegra/common.h
@@ -7,8 +7,11 @@
#define __SOC_TEGRA_COMMON_H__
#include <linux/types.h>
+#include <linux/sysfs.h>
#ifdef CONFIG_ARCH_TEGRA
+extern struct kobject *tegra_soc_kobj;
+
bool soc_is_tegra(void);
#else
static inline bool soc_is_tegra(void)
--
2.26.0
next prev parent reply other threads:[~2020-05-16 15:37 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-16 15:36 [PATCH v5 0/6] Introduce NVIDIA Tegra Partition Table Dmitry Osipenko
2020-05-16 15:36 ` [PATCH v5 1/6] mmc: core: Add raw_boot_mult field to mmc_ext_csd Dmitry Osipenko
2020-05-16 15:36 ` [PATCH v5 2/6] mmc: block: Add mmc_bdev_to_card() helper Dmitry Osipenko
2020-05-16 15:36 ` [PATCH v5 3/6] partitions: Introduce NVIDIA Tegra Partition Table Dmitry Osipenko
2020-05-16 15:36 ` [PATCH v5 4/6] partitions/efi: Support GPT entry lookup at a non-standard location Dmitry Osipenko
2020-05-16 15:51 ` Randy Dunlap
2020-05-16 16:50 ` Dmitry Osipenko
2020-05-16 16:58 ` Randy Dunlap
2020-05-17 0:11 ` Dmitry Osipenko
2020-05-17 2:07 ` Randy Dunlap
2020-05-16 15:36 ` [PATCH v5 5/6] partitions/tegra: Support enforced GPT scanning Dmitry Osipenko
2020-05-16 15:52 ` Randy Dunlap
2020-05-16 15:36 ` Dmitry Osipenko [this message]
2020-05-18 7:45 ` [PATCH v5 6/6] soc/tegra: Expose Boot Configuration Table via sysfs Michał Mirosław
2020-05-18 8:00 ` Dmitry Osipenko
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