path: root/drivers/dma/idxd/sysfs.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <uapi/linux/idxd.h>
#include "registers.h"
#include "idxd.h"

static char *idxd_wq_type_names[] = {
	[IDXD_WQT_NONE]		= "none",
	[IDXD_WQT_KERNEL]	= "kernel",
	[IDXD_WQT_USER]		= "user",
};

/* IDXD engine attributes */
static ssize_t engine_group_id_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct idxd_engine *engine = confdev_to_engine(dev);

	if (engine->group)
		return sysfs_emit(buf, "%d\n", engine->group->id);
	else
		return sysfs_emit(buf, "%d\n", -1);
}

static ssize_t engine_group_id_store(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct idxd_engine *engine = confdev_to_engine(dev);
	struct idxd_device *idxd = engine->idxd;
	long id;
	int rc;
	struct idxd_group *prevg;

	rc = kstrtol(buf, 10, &id);
	if (rc < 0)
		return -EINVAL;

	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
		return -EPERM;

	if (id > idxd->max_groups - 1 || id < -1)
		return -EINVAL;

	if (id == -1) {
		if (engine->group) {
			engine->group->num_engines--;
			engine->group = NULL;
		}
		return count;
	}

	prevg = engine->group;

	if (prevg)
		prevg->num_engines--;
	engine->group = idxd->groups[id];
	engine->group->num_engines++;

	return count;
}

static struct device_attribute dev_attr_engine_group =
		__ATTR(group_id, 0644, engine_group_id_show,
		       engine_group_id_store);

static struct attribute *idxd_engine_attributes[] = {
	&dev_attr_engine_group.attr,
	NULL,
};

static const struct attribute_group idxd_engine_attribute_group = {
	.attrs = idxd_engine_attributes,
};

static const struct attribute_group *idxd_engine_attribute_groups[] = {
	&idxd_engine_attribute_group,
	NULL,
};

static void idxd_conf_engine_release(struct device *dev)
{
	struct idxd_engine *engine = confdev_to_engine(dev);

	kfree(engine);
}

struct device_type idxd_engine_device_type = {
	.name = "engine",
	.release = idxd_conf_engine_release,
	.groups = idxd_engine_attribute_groups,
};

/* Group attributes */

static void idxd_set_free_rdbufs(struct idxd_device *idxd)
{
	int i, rdbufs;

	for (i = 0, rdbufs = 0; i < idxd->max_groups; i++) {
		struct idxd_group *g = idxd->groups[i];

		rdbufs += g->rdbufs_reserved;
	}

	idxd->nr_rdbufs = idxd->max_rdbufs - rdbufs;
}

static ssize_t group_read_buffers_reserved_show(struct device *dev,
						struct device_attribute *attr,
						char *buf)
{
	struct idxd_group *group = confdev_to_group(dev);

	return sysfs_emit(buf, "%u\n", group->rdbufs_reserved);
}

static ssize_t group_tokens_reserved_show(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	dev_warn_once(dev, "attribute deprecated, see read_buffers_reserved.\n");
	return group_read_buffers_reserved_show(dev, attr, buf);
}

static ssize_t group_read_buffers_reserved_store(struct device *dev,
						 struct device_attribute *attr,
						 const char *buf, size_t count)
{
	struct idxd_group *group = confdev_to_group(dev);
	struct idxd_device *idxd = group->idxd;
	unsigned long val;
	int rc;

	rc = kstrtoul(buf, 10, &val);
	if (rc < 0)
		return -EINVAL;

	if (idxd->data->type == IDXD_TYPE_IAX)
		return -EOPNOTSUPP;

	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
		return -EPERM;

	if (idxd->state == IDXD_DEV_ENABLED)
		return -EPERM;

	if (val > idxd->max_rdbufs)
		return -EINVAL;

	if (val > idxd->nr_rdbufs + group->rdbufs_reserved)
		return -EINVAL;

	group->rdbufs_reserved = val;
	idxd_set_free_rdbufs(idxd);
	return count;
}

static ssize_t group_tokens_reserved_store(struct device *dev,
					   struct device_attribute *attr,
					   const char *buf, size_t count)
{
	dev_warn_once(dev, "attribute deprecated, see read_buffers_reserved.\n");
	return group_read_buffers_reserved_store(dev, attr, buf, count);
}

static struct device_attribute dev_attr_group_tokens_reserved =
		__ATTR(tokens_reserved, 0644, group_tokens_reserved_show,
		       group_tokens_reserved_store);

static struct device_attribute dev_attr_group_read_buffers_reserved =
		__ATTR(read_buffers_reserved, 0644, group_read_buffers_reserved_show,
		       group_read_buffers_reserved_store);

static ssize_t group_read_buffers_allowed_show(struct device *dev,
					       struct device_attribute *attr,
					       char *buf)
{
	struct idxd_group *group = confdev_to_group(dev);

	return sysfs_emit(buf, "%u\n", group->rdbufs_allowed);
}

static ssize_t group_tokens_allowed_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	dev_warn_once(dev, "attribute deprecated, see read_buffers_allowed.\n");
	return group_read_buffers_allowed_show(dev, attr, buf);
}

static ssize_t group_read_buffers_allowed_store(struct device *dev,
						struct device_attribute *attr,
						const char *buf, size_t count)
{
	struct idxd_group *group = confdev_to_group(dev);
	struct idxd_device *idxd = group->idxd;
	unsigned long val;
	int rc;

	rc = kstrtoul(buf, 10, &val);
	if (rc < 0)
		return -EINVAL;

	if (idxd->data->type == IDXD_TYPE_IAX)
		return -EOPNOTSUPP;

	if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
		return -EPERM;

	if (idxd->state == IDXD_DEV_ENABLED)
		return -EPERM;

	if (val < 4 * group->num_engines ||
	    val > group->rdbufs_reserved + idxd->nr_rdbufs)
		return