diff mbox series

[V5,2/3] soc: qcom: boot_stat: Add Driver Support for Boot Stats

Message ID 142bfd034c12c245cda9f1dee20a05188b63494d.1681799201.git.quic_schowdhu@quicinc.com
State Superseded
Headers show
Series soc: qcom: boot_stats: Add driver support for boot_stats | expand

Commit Message

Souradeep Chowdhury April 18, 2023, 6:46 a.m. UTC
All of Qualcomm's proprietary Android boot-loaders capture boot time
stats, like the time when the bootloader started execution and at what
point the bootloader handed over control to the kernel etc. in the IMEM
region. This information is captured in a specific format by this driver
by mapping a structure to the IMEM memory region and then accessing the
members of the structure to show the information within debugfs file.
This information is useful in verifying if the existing boot KPIs have
regressed or not. The information is shown in milliseconds, a sample
log from sm8450(waipio) device is as follows:-

/sys/kernel/debug/146aa6b0.boot_stats # cat abl_time
17898 ms
/sys/kernel/debug/146aa6b0.boot_stats # cat pre_abl_time
2879 ms

The Module Power Manager(MPM) sleep counter starts ticking at the PBL
stage and the timestamp generated by the sleep counter is logged by
the Qualcomm proprietary bootloader(ABL) at two points-> First when it
starts execution which is logged here as "pre_abl_time" and the second
when it is about to load the kernel logged as "abl_time". Documentation
details are also added in Documentation/ABI/testing/debugfs-driver-bootstat

Signed-off-by: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
---
 Documentation/ABI/testing/debugfs-driver-bootstat |  17 ++++
 drivers/soc/qcom/Kconfig                          |   9 ++
 drivers/soc/qcom/Makefile                         |   1 +
 drivers/soc/qcom/boot_stats.c                     | 101 ++++++++++++++++++++++
 4 files changed, 128 insertions(+)
 create mode 100644 Documentation/ABI/testing/debugfs-driver-bootstat
 create mode 100644 drivers/soc/qcom/boot_stats.c

Comments

Bryan O'Donoghue April 21, 2023, 10:02 a.m. UTC | #1
On 18/04/2023 07:46, Souradeep Chowdhury wrote:
> All of Qualcomm's proprietary Android boot-loaders capture boot time
> stats, like the time when the bootloader started execution and at what
> point the bootloader handed over control to the kernel etc. in the IMEM
> region. This information is captured in a specific format by this driver
> by mapping a structure to the IMEM memory region and then accessing the
> members of the structure to show the information within debugfs file.
> This information is useful in verifying if the existing boot KPIs have
> regressed or not. The information is shown in milliseconds, a sample
> log from sm8450(waipio) device is as follows:-
> 
> /sys/kernel/debug/146aa6b0.boot_stats # cat abl_time
> 17898 ms
> /sys/kernel/debug/146aa6b0.boot_stats # cat pre_abl_time
> 2879 ms
> 
> The Module Power Manager(MPM) sleep counter starts ticking at the PBL
> stage and the timestamp generated by the sleep counter is logged by
> the Qualcomm proprietary bootloader(ABL) at two points-> First when it
> starts execution which is logged here as "pre_abl_time" and the second
> when it is about to load the kernel logged as "abl_time". Documentation
> details are also added in Documentation/ABI/testing/debugfs-driver-bootstat
> 
> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
> ---
>   Documentation/ABI/testing/debugfs-driver-bootstat |  17 ++++
>   drivers/soc/qcom/Kconfig                          |   9 ++
>   drivers/soc/qcom/Makefile                         |   1 +
>   drivers/soc/qcom/boot_stats.c                     | 101 ++++++++++++++++++++++
>   4 files changed, 128 insertions(+)
>   create mode 100644 Documentation/ABI/testing/debugfs-driver-bootstat
>   create mode 100644 drivers/soc/qcom/boot_stats.c
> 
> diff --git a/Documentation/ABI/testing/debugfs-driver-bootstat b/Documentation/ABI/testing/debugfs-driver-bootstat
> new file mode 100644
> index 0000000..2543029
> --- /dev/null
> +++ b/Documentation/ABI/testing/debugfs-driver-bootstat
> @@ -0,0 +1,17 @@
> +What:		/sys/kernel/debug/...stats/pre_abl_time
> +Date:           April 2023
> +Contact:        Souradeep Chowdhury <quic_schowdhu@quicinc.com>
> +Description:
> +		This file is used to read the KPI value pre abl time.
> +		It shows the time in milliseconds from the starting
> +		point of PBL to the point when the control shifted
> +		to ABL(Qualcomm proprietary bootloader).
> +
> +What:           /sys/kernel/debug/...stats/abl_time
> +Date:           April 2023
> +Contact:        Souradeep Chowdhury <quic_schowdhu@quicinc.com>
> +Description:
> +		This file is used to read the KPI value abl time.
> +		It show the duration in milliseconds from the
> +		time control switched to ABL to the point when
> +		the linux kernel started getting loaded.
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index a8f2830..0d2cbd3 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -16,6 +16,15 @@ config QCOM_AOSS_QMP
>   	  subsystems as well as controlling the debug clocks exposed by the Always On
>   	  Subsystem (AOSS) using Qualcomm Messaging Protocol (QMP).
>   
> +config QCOM_BOOTSTAT
> +	tristate "Qualcomm Technologies, Boot Stat driver"
> +	depends on ARCH_QCOM || COMPILE_TEST
> +	help
> +	  This option enables driver support for boot stats. Boot stat driver logs
> +	  the kernel bootloader information by accessing the imem region. These
> +	  information are exposed in the form of debugfs files. This is used to
> +	  determine if there is any regression in boot timings.
> +
>   config QCOM_COMMAND_DB
>   	tristate "Qualcomm Command DB"
>   	depends on ARCH_QCOM || COMPILE_TEST
> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
> index 6e88da8..bdaa41a 100644
> --- a/drivers/soc/qcom/Makefile
> +++ b/drivers/soc/qcom/Makefile
> @@ -1,6 +1,7 @@
>   # SPDX-License-Identifier: GPL-2.0
>   CFLAGS_rpmh-rsc.o := -I$(src)
>   obj-$(CONFIG_QCOM_AOSS_QMP) +=	qcom_aoss.o
> +obj-$(CONFIG_QCOM_BOOTSTAT) += boot_stats.o
>   obj-$(CONFIG_QCOM_GENI_SE) +=	qcom-geni-se.o
>   obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
>   obj-$(CONFIG_QCOM_CPR)		+= cpr.o
> diff --git a/drivers/soc/qcom/boot_stats.c b/drivers/soc/qcom/boot_stats.c
> new file mode 100644
> index 0000000..7ae002b
> --- /dev/null
> +++ b/drivers/soc/qcom/boot_stats.c
> @@ -0,0 +1,101 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/debugfs.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +
> +#define TO_MS(timestamp) ((timestamp * 1000) / 32768)

Is this related to the sleep_clk, if not, what is the refrence clock ?

Is this value constant across different SoCs i.e. will this run and 
produce meaningful results on an msm8916 ?

---
bod
Souradeep Chowdhury April 21, 2023, 10:20 a.m. UTC | #2
On 4/21/2023 3:32 PM, Bryan O'Donoghue wrote:
> On 18/04/2023 07:46, Souradeep Chowdhury wrote:
>> All of Qualcomm's proprietary Android boot-loaders capture boot time
>> stats, like the time when the bootloader started execution and at what
>> point the bootloader handed over control to the kernel etc. in the IMEM
>> region. This information is captured in a specific format by this driver
>> by mapping a structure to the IMEM memory region and then accessing the
>> members of the structure to show the information within debugfs file.
>> This information is useful in verifying if the existing boot KPIs have
>> regressed or not. The information is shown in milliseconds, a sample
>> log from sm8450(waipio) device is as follows:-
>>
>> /sys/kernel/debug/146aa6b0.boot_stats # cat abl_time
>> 17898 ms
>> /sys/kernel/debug/146aa6b0.boot_stats # cat pre_abl_time
>> 2879 ms
>>
>> The Module Power Manager(MPM) sleep counter starts ticking at the PBL
>> stage and the timestamp generated by the sleep counter is logged by
>> the Qualcomm proprietary bootloader(ABL) at two points-> First when it
>> starts execution which is logged here as "pre_abl_time" and the second
>> when it is about to load the kernel logged as "abl_time". Documentation
>> details are also added in 
>> Documentation/ABI/testing/debugfs-driver-bootstat
>>
>> Signed-off-by: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
>> ---
>>   Documentation/ABI/testing/debugfs-driver-bootstat |  17 ++++
>>   drivers/soc/qcom/Kconfig                          |   9 ++
>>   drivers/soc/qcom/Makefile                         |   1 +
>>   drivers/soc/qcom/boot_stats.c                     | 101 
>> ++++++++++++++++++++++
>>   4 files changed, 128 insertions(+)
>>   create mode 100644 Documentation/ABI/testing/debugfs-driver-bootstat
>>   create mode 100644 drivers/soc/qcom/boot_stats.c
>>
>> diff --git a/Documentation/ABI/testing/debugfs-driver-bootstat 
>> b/Documentation/ABI/testing/debugfs-driver-bootstat
>> new file mode 100644
>> index 0000000..2543029
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/debugfs-driver-bootstat
>> @@ -0,0 +1,17 @@
>> +What:        /sys/kernel/debug/...stats/pre_abl_time
>> +Date:           April 2023
>> +Contact:        Souradeep Chowdhury <quic_schowdhu@quicinc.com>
>> +Description:
>> +        This file is used to read the KPI value pre abl time.
>> +        It shows the time in milliseconds from the starting
>> +        point of PBL to the point when the control shifted
>> +        to ABL(Qualcomm proprietary bootloader).
>> +
>> +What:           /sys/kernel/debug/...stats/abl_time
>> +Date:           April 2023
>> +Contact:        Souradeep Chowdhury <quic_schowdhu@quicinc.com>
>> +Description:
>> +        This file is used to read the KPI value abl time.
>> +        It show the duration in milliseconds from the
>> +        time control switched to ABL to the point when
>> +        the linux kernel started getting loaded.
>> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
>> index a8f2830..0d2cbd3 100644
>> --- a/drivers/soc/qcom/Kconfig
>> +++ b/drivers/soc/qcom/Kconfig
>> @@ -16,6 +16,15 @@ config QCOM_AOSS_QMP
>>         subsystems as well as controlling the debug clocks exposed by 
>> the Always On
>>         Subsystem (AOSS) using Qualcomm Messaging Protocol (QMP).
>> +config QCOM_BOOTSTAT
>> +    tristate "Qualcomm Technologies, Boot Stat driver"
>> +    depends on ARCH_QCOM || COMPILE_TEST
>> +    help
>> +      This option enables driver support for boot stats. Boot stat 
>> driver logs
>> +      the kernel bootloader information by accessing the imem region. 
>> These
>> +      information are exposed in the form of debugfs files. This is 
>> used to
>> +      determine if there is any regression in boot timings.
>> +
>>   config QCOM_COMMAND_DB
>>       tristate "Qualcomm Command DB"
>>       depends on ARCH_QCOM || COMPILE_TEST
>> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
>> index 6e88da8..bdaa41a 100644
>> --- a/drivers/soc/qcom/Makefile
>> +++ b/drivers/soc/qcom/Makefile
>> @@ -1,6 +1,7 @@
>>   # SPDX-License-Identifier: GPL-2.0
>>   CFLAGS_rpmh-rsc.o := -I$(src)
>>   obj-$(CONFIG_QCOM_AOSS_QMP) +=    qcom_aoss.o
>> +obj-$(CONFIG_QCOM_BOOTSTAT) += boot_stats.o
>>   obj-$(CONFIG_QCOM_GENI_SE) +=    qcom-geni-se.o
>>   obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
>>   obj-$(CONFIG_QCOM_CPR)        += cpr.o
>> diff --git a/drivers/soc/qcom/boot_stats.c 
>> b/drivers/soc/qcom/boot_stats.c
>> new file mode 100644
>> index 0000000..7ae002b
>> --- /dev/null
>> +++ b/drivers/soc/qcom/boot_stats.c
>> @@ -0,0 +1,101 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights 
>> reserved.
>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights 
>> reserved.
>> + */
>> +
>> +#include <linux/debugfs.h>
>> +#include <linux/err.h>
>> +#include <linux/io.h>
>> +#include <linux/init.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_address.h>
>> +#include <linux/platform_device.h>
>> +
>> +#define TO_MS(timestamp) ((timestamp * 1000) / 32768)
> 
> Is this related to the sleep_clk, if not, what is the refrence clock ?
> 
> Is this value constant across different SoCs i.e. will this run and 
> produce meaningful results on an msm8916 ?

This is the sleep counter of MPM(Module Power Manager), yes, it will 
produce meaningful results on almost all QCOM SoCs including msm8916.

> 
> ---
> bod
kernel test robot April 22, 2023, 11:29 p.m. UTC | #3
Hi Souradeep,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on krzk-dt/for-next linus/master v6.3-rc7 next-20230421]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Souradeep-Chowdhury/dt-bindings-sram-qcom-imem-Add-Boot-Stat-region-within-IMEM/20230418-144757
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/142bfd034c12c245cda9f1dee20a05188b63494d.1681799201.git.quic_schowdhu%40quicinc.com
patch subject: [PATCH V5 2/3] soc: qcom: boot_stat: Add Driver Support for Boot Stats
config: nios2-randconfig-s033-20230423 (https://download.01.org/0day-ci/archive/20230423/202304230707.TM8MomW0-lkp@intel.com/config)
compiler: nios2-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/1e2fc43bcc0869349f7e3698fceebbcc8333d1f3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Souradeep-Chowdhury/dt-bindings-sram-qcom-imem-Add-Boot-Stat-region-within-IMEM/20230418-144757
        git checkout 1e2fc43bcc0869349f7e3698fceebbcc8333d1f3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 SHELL=/bin/bash drivers/soc/qcom/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304230707.TM8MomW0-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/soc/qcom/boot_stats.c:70:36: sparse: sparse: incorrect type in argument 4 (different address spaces) @@     expected void *data @@     got struct boot_stats [noderef] __iomem *b_stats @@
   drivers/soc/qcom/boot_stats.c:70:36: sparse:     expected void *data
   drivers/soc/qcom/boot_stats.c:70:36: sparse:     got struct boot_stats [noderef] __iomem *b_stats
   drivers/soc/qcom/boot_stats.c:71:72: sparse: sparse: incorrect type in argument 4 (different address spaces) @@     expected void *data @@     got struct boot_stats [noderef] __iomem *b_stats @@
   drivers/soc/qcom/boot_stats.c:71:72: sparse:     expected void *data
   drivers/soc/qcom/boot_stats.c:71:72: sparse:     got struct boot_stats [noderef] __iomem *b_stats

vim +70 drivers/soc/qcom/boot_stats.c

    52	
    53	static int boot_stats_probe(struct platform_device *pdev)
    54	{
    55		struct device *bootstat_dev = &pdev->dev;
    56		struct bs_data *drvdata;
    57	
    58		drvdata = devm_kzalloc(bootstat_dev, sizeof(*drvdata), GFP_KERNEL);
    59		platform_set_drvdata(pdev, drvdata);
    60	
    61		drvdata->dbg_dir = debugfs_create_dir(dev_name(bootstat_dev), NULL);
    62		if (IS_ERR(drvdata->dbg_dir))
    63			return dev_err_probe(bootstat_dev, -ENOENT, "failed to create debugfs directory");
    64	
    65		drvdata->b_stats = devm_of_iomap(bootstat_dev, bootstat_dev->of_node, 0, NULL);
    66		if (!drvdata->b_stats)
    67			return dev_err_probe(bootstat_dev, -ENOMEM, "failed to map imem region\n");
    68	
    69		debugfs_create_file("pre_abl_time", 0200, drvdata->dbg_dir,
  > 70				    drvdata->b_stats, &pre_abl_time_fops);
    71		debugfs_create_file("abl_time", 0200, drvdata->dbg_dir, drvdata->b_stats, &abl_time_fops);
    72	
    73		return 0;
    74	}
    75
diff mbox series

Patch

diff --git a/Documentation/ABI/testing/debugfs-driver-bootstat b/Documentation/ABI/testing/debugfs-driver-bootstat
new file mode 100644
index 0000000..2543029
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-driver-bootstat
@@ -0,0 +1,17 @@ 
+What:		/sys/kernel/debug/...stats/pre_abl_time
+Date:           April 2023
+Contact:        Souradeep Chowdhury <quic_schowdhu@quicinc.com>
+Description:
+		This file is used to read the KPI value pre abl time.
+		It shows the time in milliseconds from the starting
+		point of PBL to the point when the control shifted
+		to ABL(Qualcomm proprietary bootloader).
+
+What:           /sys/kernel/debug/...stats/abl_time
+Date:           April 2023
+Contact:        Souradeep Chowdhury <quic_schowdhu@quicinc.com>
+Description:
+		This file is used to read the KPI value abl time.
+		It show the duration in milliseconds from the
+		time control switched to ABL to the point when
+		the linux kernel started getting loaded.
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index a8f2830..0d2cbd3 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -16,6 +16,15 @@  config QCOM_AOSS_QMP
 	  subsystems as well as controlling the debug clocks exposed by the Always On
 	  Subsystem (AOSS) using Qualcomm Messaging Protocol (QMP).
 
+config QCOM_BOOTSTAT
+	tristate "Qualcomm Technologies, Boot Stat driver"
+	depends on ARCH_QCOM || COMPILE_TEST
+	help
+	  This option enables driver support for boot stats. Boot stat driver logs
+	  the kernel bootloader information by accessing the imem region. These
+	  information are exposed in the form of debugfs files. This is used to
+	  determine if there is any regression in boot timings.
+
 config QCOM_COMMAND_DB
 	tristate "Qualcomm Command DB"
 	depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 6e88da8..bdaa41a 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -1,6 +1,7 @@ 
 # SPDX-License-Identifier: GPL-2.0
 CFLAGS_rpmh-rsc.o := -I$(src)
 obj-$(CONFIG_QCOM_AOSS_QMP) +=	qcom_aoss.o
+obj-$(CONFIG_QCOM_BOOTSTAT) += boot_stats.o
 obj-$(CONFIG_QCOM_GENI_SE) +=	qcom-geni-se.o
 obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
 obj-$(CONFIG_QCOM_CPR)		+= cpr.o
diff --git a/drivers/soc/qcom/boot_stats.c b/drivers/soc/qcom/boot_stats.c
new file mode 100644
index 0000000..7ae002b
--- /dev/null
+++ b/drivers/soc/qcom/boot_stats.c
@@ -0,0 +1,101 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2013-2019, 2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+#define TO_MS(timestamp) ((timestamp * 1000) / 32768)
+
+/**
+ *  struct boot_stats - timestamp information related to boot stats
+ *  @abl_start: Time for the starting point of the abl
+ *  @abl_end: Time when the kernel starts loading from abl
+ */
+struct boot_stats {
+	u32 abl_start;
+	u32 abl_end;
+} __packed;
+
+struct bs_data {
+	struct boot_stats __iomem *b_stats;
+	struct dentry *dbg_dir;
+};
+
+static int abl_time_show(struct seq_file *seq, void *v)
+{
+	struct boot_stats *boot_stats = seq->private;
+	u32 abl_time = TO_MS(boot_stats->abl_end) - TO_MS(boot_stats->abl_start);
+
+	seq_printf(seq, "%u ms\n", abl_time);
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(abl_time);
+
+static int pre_abl_time_show(struct seq_file *seq, void *v)
+{
+	struct boot_stats *boot_stats = seq->private;
+
+	seq_printf(seq, "%u ms\n", TO_MS(boot_stats->abl_start));
+	return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(pre_abl_time);
+
+static int boot_stats_probe(struct platform_device *pdev)
+{
+	struct device *bootstat_dev = &pdev->dev;
+	struct bs_data *drvdata;
+
+	drvdata = devm_kzalloc(bootstat_dev, sizeof(*drvdata), GFP_KERNEL);
+	platform_set_drvdata(pdev, drvdata);
+
+	drvdata->dbg_dir = debugfs_create_dir(dev_name(bootstat_dev), NULL);
+	if (IS_ERR(drvdata->dbg_dir))
+		return dev_err_probe(bootstat_dev, -ENOENT, "failed to create debugfs directory");
+
+	drvdata->b_stats = devm_of_iomap(bootstat_dev, bootstat_dev->of_node, 0, NULL);
+	if (!drvdata->b_stats)
+		return dev_err_probe(bootstat_dev, -ENOMEM, "failed to map imem region\n");
+
+	debugfs_create_file("pre_abl_time", 0200, drvdata->dbg_dir,
+			    drvdata->b_stats, &pre_abl_time_fops);
+	debugfs_create_file("abl_time", 0200, drvdata->dbg_dir, drvdata->b_stats, &abl_time_fops);
+
+	return 0;
+}
+
+static void boot_stats_remove(struct platform_device *pdev)
+{
+	struct bs_data *drvdata = platform_get_drvdata(pdev);
+
+	debugfs_remove_recursive(drvdata->dbg_dir);
+	iounmap(drvdata->b_stats);
+}
+
+static const struct of_device_id boot_stats_dt_match[] = {
+	{ .compatible = "qcom,sm8450-bootstats" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, boot_stats_dt_match);
+
+static struct platform_driver boot_stat_driver = {
+	.probe  = boot_stats_probe,
+	.remove_new = boot_stats_remove,
+	.driver = {
+		.name = "qcom-boot-stats",
+		.of_match_table = boot_stats_dt_match,
+	},
+};
+module_platform_driver(boot_stat_driver);
+
+MODULE_DESCRIPTION("Qualcomm Technologies Inc. Boot Stat driver");
+MODULE_LICENSE("GPL");