Date: Thu, 25 Apr 2024 18:11:13 +0000
From: Shiju Jose <shiju.jose@...wei.com>
To: Borislav Petkov <bp@...en8.de>
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Subject: RE: [RFC PATCH v8 01/10] ras: scrub: Add scrub subsystem

Hi Boris,

Thanks for the feedbacks. 

Please find reply inline,

Thanks,
Shiju
>-----Original Message-----
>From: Borislav Petkov <bp@...en8.de>
>Sent: 25 April 2024 11:16
>To: Shiju Jose <shiju.jose@...wei.com>
>Cc: linux-cxl@...r.kernel.org; linux-acpi@...r.kernel.org; linux-
>mm@...ck.org; dan.j.williams@...el.com; dave@...olabs.net; Jonathan
>Cameron <jonathan.cameron@...wei.com>; dave.jiang@...el.com;
>alison.schofield@...el.com; vishal.l.verma@...el.com; ira.weiny@...el.com;
>linux-edac@...r.kernel.org; linux-kernel@...r.kernel.org; david@...hat.com;
>Vilas.Sridharan@....com; leo.duran@....com; Yazen.Ghannam@....com;
>rientjes@...gle.com; jiaqiyan@...gle.com; tony.luck@...el.com;
>Jon.Grimm@....com; dave.hansen@...ux.intel.com; rafael@...nel.org;
>lenb@...nel.org; naoya.horiguchi@....com; james.morse@....com;
>jthoughton@...gle.com; somasundaram.a@....com;
>erdemaktas@...gle.com; pgonda@...gle.com; duenwen@...gle.com;
>mike.malvestuto@...el.com; gthelen@...gle.com;
>wschwartz@...erecomputing.com; dferguson@...erecomputing.com;
>wbs@...amperecomputing.com; nifan.cxl@...il.com; tanxiaofei
><tanxiaofei@...wei.com>; Zengtao (B) <prime.zeng@...ilicon.com>;
>kangkang.shen@...urewei.com; wanghuiqiang <wanghuiqiang@...wei.com>;
>Linuxarm <linuxarm@...wei.com>
>Subject: Re: [RFC PATCH v8 01/10] ras: scrub: Add scrub subsystem
>
>On Sat, Apr 20, 2024 at 12:47:10AM +0800, shiju.jose@...wei.com wrote:
>> From: Shiju Jose <shiju.jose@...wei.com>
>>
>> Add scrub subsystem supports configuring the memory scrubbers in the
>> system. The scrub subsystem provides the interface for registering the
>> scrub devices. The scrub control attributes are provided to the user
>> in /sys/class/ras/rasX/scrub
>>
>> Co-developed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
>> ---
>>  .../ABI/testing/sysfs-class-scrub-configure   |  47 +++
>>  drivers/ras/Kconfig                           |   7 +
>>  drivers/ras/Makefile                          |   1 +
>>  drivers/ras/memory_scrub.c                    | 271 ++++++++++++++++++
>>  include/linux/memory_scrub.h                  |  37 +++
>>  5 files changed, 363 insertions(+)
>>  create mode 100644
>> Documentation/ABI/testing/sysfs-class-scrub-configure
>>  create mode 100755 drivers/ras/memory_scrub.c  create mode 100755
>> include/linux/memory_scrub.h
>
>ERROR: modpost: missing MODULE_LICENSE() in drivers/ras/memory_scrub.o
>make[2]: *** [scripts/Makefile.modpost:145: Module.symvers] Error 1
>make[1]: *** [/mnt/kernel/kernel/2nd/linux/Makefile:1871: modpost] Error 2
>make: *** [Makefile:240: __sub-make] Error 2
>
>Each patch of yours needs to build.

Fixed.

>
>> diff --git a/Documentation/ABI/testing/sysfs-class-scrub-configure
>> b/Documentation/ABI/testing/sysfs-class-scrub-configure
>> new file mode 100644
>> index 000000000000..3ed77dbb00ad
>> --- /dev/null
>> +++ b/Documentation/ABI/testing/sysfs-class-scrub-configure
>> @@ -0,0 +1,47 @@
>> +What:		/sys/class/ras/
>> +Date:		March 2024
>> +KernelVersion:	6.9
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:
>> +		The ras/ class subdirectory belongs to the
>> +		common ras features such as scrub subsystem.
>> +
>> +What:		/sys/class/ras/rasX/scrub/
>> +Date:		March 2024
>> +KernelVersion:	6.9
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:
>> +		The /sys/class/ras/ras{0,1,2,3,...}/scrub directories
>
>You have different scrubbers.
>
>I'd prefer if you put their names in here instead and do this structure:
>
>/sys/class/ras/scrub/cxl-patrol
>		    /ars
>		    /cxl-ecs
>		    /acpi-ras2
>
>and so on.
>
>Unless the idea is for those devices to have multiple RAS-specific functionality
>than just scrubbing. Then you want to do
>
>/sys/class/ras/cxl/scrub
>		  /other_function
>
>/sys/class/ras/ars/scrub
>		  /...
>
>You get the idea.
It is expected to have multiple RAS-specific functionalities other than scrubbing  in long run.
Most of the classes in the kernel found as  /sys/class/<class-name>/<class-name>X/   

If not, however /sys/class/ras/<module -name>X/<feature> is more suitable because
there are multiple device instances such as cxl devices with scrub control feature.
For example, /sys/class/ras/cxlX/scrub
 
>
>> +		correspond to each scrub device registered with the
>> +		scrub subsystem.
>> +
>> +What:		/sys/class/ras/rasX/scrub/name
>> +Date:		March 2024
>> +KernelVersion:	6.9
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:
>> +		(RO) name of the memory scrubber
>> +
>> +What:		/sys/class/ras/rasX/scrub/enable_background
>> +Date:		March 2024
>> +KernelVersion:	6.9
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:
>> +		(RW) Enable/Disable background(patrol) scrubbing if supported.
>> +
>> +What:		/sys/class/ras/rasX/scrub/rate_available
>
>That's dumping a range so I guess it should be called probably "possible_rates"
>or so, so that it is clear what it means.
>
>If some scrubbers support only a discrete set of rate values, then
>"possible_rates" fits too if you dump them as a list of values.
Sure. Will check.

>
>> +Date:		March 2024
>> +KernelVersion:	6.9
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:
>> +		(RO) Supported range for the scrub rate by the scrubber.
>> +		The scrub rate represents in hours.
>> +
>> +What:		/sys/class/ras/rasX/scrub/rate
>> +Date:		March 2024
>> +KernelVersion:	6.9
>> +Contact:	linux-kernel@...r.kernel.org
>> +Description:
>> +		(RW) The scrub rate specified and it must be with in the
>> +		supported range by the scrubber.
>> +		The scrub rate represents in hours.
>> diff --git a/drivers/ras/Kconfig b/drivers/ras/Kconfig index
>> fc4f4bb94a4c..181701479564 100644
>> --- a/drivers/ras/Kconfig
>> +++ b/drivers/ras/Kconfig
>> @@ -46,4 +46,11 @@ config RAS_FMPM
>>  	  Memory will be retired during boot time and run time depending on
>>  	  platform-specific policies.
>>
>> +config SCRUB
>> +	tristate "Memory scrub driver"
>> +	help
>> +	  This option selects the memory scrub subsystem, supports
>
>s/This option selects/Enable/
Sure.

>
>> +	  configuring the parameters of underlying scrubbers in the
>> +	  system for the DRAM memories.
>> +
>>  endif
>> diff --git a/drivers/ras/Makefile b/drivers/ras/Makefile index
>> 11f95d59d397..89bcf0d84355 100644
>> --- a/drivers/ras/Makefile
>> +++ b/drivers/ras/Makefile
>> @@ -2,6 +2,7 @@
>>  obj-$(CONFIG_RAS)	+= ras.o
>>  obj-$(CONFIG_DEBUG_FS)	+= debugfs.o
>>  obj-$(CONFIG_RAS_CEC)	+= cec.o
>> +obj-$(CONFIG_SCRUB)	+= memory_scrub.o
>>
>>  obj-$(CONFIG_RAS_FMPM)	+= amd/fmpm.o
>>  obj-y			+= amd/atl/
>> diff --git a/drivers/ras/memory_scrub.c b/drivers/ras/memory_scrub.c
>> new file mode 100755 index 000000000000..7e995380ec3a
>> --- /dev/null
>> +++ b/drivers/ras/memory_scrub.c
>> @@ -0,0 +1,271 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Memory scrub subsystem supports configuring the registered
>> + * memory scrubbers.
>> + *
>> + * Copyright (c) 2024 HiSilicon Limited.
>> + */
>> +
>> +#define pr_fmt(fmt)     "MEM SCRUB: " fmt
>> +
>> +#include <linux/acpi.h>
>> +#include <linux/bitops.h>
>> +#include <linux/delay.h>
>> +#include <linux/kfifo.h>
>> +#include <linux/memory_scrub.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/spinlock.h>
>> +
>> +/* memory scrubber config definitions */
>
>No need for that comment.
Will remove.
>
>> +static ssize_t rate_available_show(struct device *dev,
>> +				   struct device_attribute *attr,
>> +				   char *buf)
>> +{
>> +	struct scrub_device *scrub_dev = to_scrub_device(dev);
>> +	u64 min_sr, max_sr;
>> +	int ret;
>> +
>> +	ret = scrub_dev->ops->rate_avail_range(dev, &min_sr, &max_sr);
>> +	if (ret)
>> +		return ret;
>> +
>> +	return sysfs_emit(buf, "0x%llx-0x%llx\n", min_sr, max_sr); }
>
>This glue driver will need to store the min and max scrub rates on init and
>rate_store() will have to verify the newly supplied rate is within that range
>before writing it.
>
>Not the user, nor the underlying hw driver.
Presently underlying hw driver does the check. I think this will become more
complex if does in the common rate_store() if we have to check against either a list of
possible rates or min and max rates.

>
>> +
>> +DEVICE_ATTR_RW(enable_background);
>> +DEVICE_ATTR_RO(name);
>> +DEVICE_ATTR_RW(rate);
>> +DEVICE_ATTR_RO(rate_available);
>
>static
>
>> +
>> +static struct attribute *scrub_attrs[] = {
>> +	&dev_attr_enable_background.attr,
>> +	&dev_attr_name.attr,
>> +	&dev_attr_rate.attr,
>> +	&dev_attr_rate_available.attr,
>> +	NULL
>> +};
>> +
>> +static umode_t scrub_attr_visible(struct kobject *kobj,
>> +				  struct attribute *a, int attr_id) {
>> +	struct device *dev = kobj_to_dev(kobj);
>> +	struct scrub_device *scrub_dev = to_scrub_device(dev);
>> +	const struct scrub_ops *ops = scrub_dev->ops;
>> +
>> +	if (a == &dev_attr_enable_background.attr) {
>> +		if (ops->set_enabled_bg && ops->get_enabled_bg)
>> +			return a->mode;
>> +		if (ops->get_enabled_bg)
>> +			return 0444;
>> +		return 0;
>> +	}
>> +	if (a == &dev_attr_name.attr)
>> +		return ops->get_name ? a->mode : 0;
>> +	if (a == &dev_attr_rate_available.attr)
>> +		return ops->rate_avail_range ? a->mode : 0;
>> +	if (a == &dev_attr_rate.attr) { /* Write only makes little sense */
>> +		if (ops->rate_read && ops->rate_write)
>> +			return a->mode;
>> +		if (ops->rate_read)
>> +			return 0444;
>> +		return 0;
>> +	}
>
>All of that stuff's permissions should be root-only.
Sure.

>
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct attribute_group scrub_attr_group = {
>> +	.name		= "scrub",
>> +	.attrs		= scrub_attrs,
>> +	.is_visible	= scrub_attr_visible,
>> +};
>> +
>> +static const struct attribute_group *scrub_attr_groups[] = {
>> +	&scrub_attr_group,
>> +	NULL
>> +};
>> +
>> +static void scrub_dev_release(struct device *dev) {
>> +	struct scrub_device *scrub_dev = to_scrub_device(dev);
>> +
>> +	ida_free(&scrub_ida, scrub_dev->id);
>> +	kfree(scrub_dev);
>> +}
>> +
>> +static struct class scrub_class = {
>> +	.name = "ras",
>> +	.dev_groups = scrub_attr_groups,
>> +	.dev_release = scrub_dev_release,
>> +};
>> +
>> +static struct device *
>> +scrub_device_register(struct device *parent, void *drvdata,
>> +		      const struct scrub_ops *ops)
>> +{
>> +	struct scrub_device *scrub_dev;
>> +	struct device *hdev;
>> +	int err;
>> +
>> +	scrub_dev = kzalloc(sizeof(*scrub_dev), GFP_KERNEL);
>> +	if (!scrub_dev)
>> +		return ERR_PTR(-ENOMEM);
>> +	hdev = &scrub_dev->dev;
>> +
>> +	scrub_dev->id = ida_alloc(&scrub_ida, GFP_KERNEL);
>
>What's that silly thing for?
This is the ras instance id (X) used for scrub control feature, /sys/class/ras/rasX/scrub/

>
>> +	if (scrub_dev->id < 0) {
>> +		kfree(scrub_dev);
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +
>> +	scrub_dev->ops = ops;
>> +	hdev->class = &scrub_class;
>> +	hdev->parent = parent;
>> +	dev_set_drvdata(hdev, drvdata);
>> +	dev_set_name(hdev, SCRUB_ID_FORMAT, scrub_dev->id);
>> +	err = device_register(hdev);
>> +	if (err) {
>> +		put_device(hdev);
>> +		return ERR_PTR(err);
>> +	}
>> +
>> +	return hdev;
>> +}
>> +
>> +static void devm_scrub_release(void *dev) {
>> +	device_unregister(dev);
>> +}
>> +
>> +/**
>> + * devm_scrub_device_register - register scrubber device
>> + * @dev: the parent device
>> + * @drvdata: driver data to attach to the scrub device
>> + * @ops: pointer to scrub_ops structure (optional)
>> + *
>> + * Returns the pointer to the new device on success, ERR_PTR() otherwise.
>> + * The new device would be automatically unregistered with the parent
>device.
>> + */
>> +struct device *
>> +devm_scrub_device_register(struct device *dev, void *drvdata,
>> +			   const struct scrub_ops *ops)
>> +{
>> +	struct device *hdev;
>> +	int ret;
>> +
>> +	if (!dev)
>> +		return ERR_PTR(-EINVAL);
>> +
>> +	hdev = scrub_device_register(dev, drvdata, ops);
>> +	if (IS_ERR(hdev))
>> +		return hdev;
>> +
>> +	ret = devm_add_action_or_reset(dev, devm_scrub_release, hdev);
>> +	if (ret)
>> +		return ERR_PTR(ret);
>> +
>> +	return hdev;
>> +}
>> +EXPORT_SYMBOL_GPL(devm_scrub_device_register);
>> +
>> +static int __init memory_scrub_control_init(void) {
>> +	return class_register(&scrub_class); }
>> +subsys_initcall(memory_scrub_control_init);
>
>You can't just blindly register this thing without checking whether there are even
>any hw scrubber devices on the system.
I  think it happens only when a dependent module as autoloaded based on a scrub device existing with exception of memory scrub control built in and who would build this in?

>
>--
>Regards/Gruss,
>    Boris.
>
Thanks,
Shiju

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