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sysfs.c
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sysfs.c
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// 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",
};
static void idxd_conf_device_release(struct device *dev)
{
dev_dbg(dev, "%s for %s\n", __func__, dev_name(dev));
}
static struct device_type idxd_group_device_type = {
.name = "group",
.release = idxd_conf_device_release,
};
static struct device_type idxd_wq_device_type = {
.name = "wq",
.release = idxd_conf_device_release,
};
static struct device_type idxd_engine_device_type = {
.name = "engine",
.release = idxd_conf_device_release,
};
static struct device_type dsa_device_type = {
.name = "dsa",
.release = idxd_conf_device_release,
};
static inline bool is_dsa_dev(struct device *dev)
{
return dev ? dev->type == &dsa_device_type : false;
}
static inline bool is_idxd_dev(struct device *dev)
{
return is_dsa_dev(dev);
}
static inline bool is_idxd_wq_dev(struct device *dev)
{
return dev ? dev->type == &idxd_wq_device_type : false;
}
static inline bool is_idxd_wq_dmaengine(struct idxd_wq *wq)
{
if (wq->type == IDXD_WQT_KERNEL &&
strcmp(wq->name, "dmaengine") == 0)
return true;
return false;
}
static inline bool is_idxd_wq_cdev(struct idxd_wq *wq)
{
return wq->type == IDXD_WQT_USER;
}
static int idxd_config_bus_match(struct device *dev,
struct device_driver *drv)
{
int matched = 0;
if (is_idxd_dev(dev)) {
struct idxd_device *idxd = confdev_to_idxd(dev);
if (idxd->state != IDXD_DEV_CONF_READY)
return 0;
matched = 1;
} else if (is_idxd_wq_dev(dev)) {
struct idxd_wq *wq = confdev_to_wq(dev);
struct idxd_device *idxd = wq->idxd;
if (idxd->state < IDXD_DEV_CONF_READY)
return 0;
if (wq->state != IDXD_WQ_DISABLED) {
dev_dbg(dev, "%s not disabled\n", dev_name(dev));
return 0;
}
matched = 1;
}
if (matched)
dev_dbg(dev, "%s matched\n", dev_name(dev));
return matched;
}
static int idxd_config_bus_probe(struct device *dev)
{
int rc;
unsigned long flags;
dev_dbg(dev, "%s called\n", __func__);
if (is_idxd_dev(dev)) {
struct idxd_device *idxd = confdev_to_idxd(dev);
if (idxd->state != IDXD_DEV_CONF_READY) {
dev_warn(dev, "Device not ready for config\n");
return -EBUSY;
}
if (!try_module_get(THIS_MODULE))
return -ENXIO;
/* Perform IDXD configuration and enabling */
spin_lock_irqsave(&idxd->dev_lock, flags);
rc = idxd_device_config(idxd);
spin_unlock_irqrestore(&idxd->dev_lock, flags);
if (rc < 0) {
module_put(THIS_MODULE);
dev_warn(dev, "Device config failed: %d\n", rc);
return rc;
}
/* start device */
rc = idxd_device_enable(idxd);
if (rc < 0) {
module_put(THIS_MODULE);
dev_warn(dev, "Device enable failed: %d\n", rc);
return rc;
}
dev_info(dev, "Device %s enabled\n", dev_name(dev));
rc = idxd_register_dma_device(idxd);
if (rc < 0) {
module_put(THIS_MODULE);
dev_dbg(dev, "Failed to register dmaengine device\n");
return rc;
}
return 0;
} else if (is_idxd_wq_dev(dev)) {
struct idxd_wq *wq = confdev_to_wq(dev);
struct idxd_device *idxd = wq->idxd;
mutex_lock(&wq->wq_lock);
if (idxd->state != IDXD_DEV_ENABLED) {
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "Enabling while device not enabled.\n");
return -EPERM;
}
if (wq->state != IDXD_WQ_DISABLED) {
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "WQ %d already enabled.\n", wq->id);
return -EBUSY;
}
if (!wq->group) {
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "WQ not attached to group.\n");
return -EINVAL;
}
if (strlen(wq->name) == 0) {
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "WQ name not set.\n");
return -EINVAL;
}
rc = idxd_wq_alloc_resources(wq);
if (rc < 0) {
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "WQ resource alloc failed\n");
return rc;
}
spin_lock_irqsave(&idxd->dev_lock, flags);
rc = idxd_device_config(idxd);
spin_unlock_irqrestore(&idxd->dev_lock, flags);
if (rc < 0) {
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "Writing WQ %d config failed: %d\n",
wq->id, rc);
return rc;
}
rc = idxd_wq_enable(wq);
if (rc < 0) {
mutex_unlock(&wq->wq_lock);
dev_warn(dev, "WQ %d enabling failed: %d\n",
wq->id, rc);
return rc;
}
rc = idxd_wq_map_portal(wq);
if (rc < 0) {
dev_warn(dev, "wq portal mapping failed: %d\n", rc);
rc = idxd_wq_disable(wq);
if (rc < 0)
dev_warn(dev, "IDXD wq disable failed\n");
mutex_unlock(&wq->wq_lock);
return rc;
}
wq->client_count = 0;
dev_info(dev, "wq %s enabled\n", dev_name(&wq->conf_dev));
if (is_idxd_wq_dmaengine(wq)) {
rc = idxd_register_dma_channel(wq);
if (rc < 0) {
dev_dbg(dev, "DMA channel register failed\n");
mutex_unlock(&wq->wq_lock);
return rc;
}
} else if (is_idxd_wq_cdev(wq)) {
rc = idxd_wq_add_cdev(wq);
if (rc < 0) {
dev_dbg(dev, "Cdev creation failed\n");
mutex_unlock(&wq->wq_lock);
return rc;
}
}
mutex_unlock(&wq->wq_lock);
return 0;
}
return -ENODEV;
}
static void disable_wq(struct idxd_wq *wq)
{
struct idxd_device *idxd = wq->idxd;
struct device *dev = &idxd->pdev->dev;
int rc;
mutex_lock(&wq->wq_lock);
dev_dbg(dev, "%s removing WQ %s\n", __func__, dev_name(&wq->conf_dev));
if (wq->state == IDXD_WQ_DISABLED) {
mutex_unlock(&wq->wq_lock);
return;
}
if (is_idxd_wq_dmaengine(wq))
idxd_unregister_dma_channel(wq);
else if (is_idxd_wq_cdev(wq))
idxd_wq_del_cdev(wq);
if (idxd_wq_refcount(wq))
dev_warn(dev, "Clients has claim on wq %d: %d\n",
wq->id, idxd_wq_refcount(wq));
idxd_wq_unmap_portal(wq);
idxd_wq_drain(wq);
rc = idxd_wq_disable(wq);
idxd_wq_free_resources(wq);
wq->client_count = 0;
mutex_unlock(&wq->wq_lock);
if (rc < 0)
dev_warn(dev, "Failed to disable %s: %d\n",
dev_name(&wq->conf_dev), rc);
else
dev_info(dev, "wq %s disabled\n", dev_name(&wq->conf_dev));
}
static int idxd_config_bus_remove(struct device *dev)
{
int rc;
dev_dbg(dev, "%s called for %s\n", __func__, dev_name(dev));
/* disable workqueue here */
if (is_idxd_wq_dev(dev)) {
struct idxd_wq *wq = confdev_to_wq(dev);
disable_wq(wq);
} else if (is_idxd_dev(dev)) {
struct idxd_device *idxd = confdev_to_idxd(dev);
int i;
dev_dbg(dev, "%s removing dev %s\n", __func__,
dev_name(&idxd->conf_dev));
for (i = 0; i < idxd->max_wqs; i++) {
struct idxd_wq *wq = &idxd->wqs[i];
if (wq->state == IDXD_WQ_DISABLED)
continue;
dev_warn(dev, "Active wq %d on disable %s.\n", i,
dev_name(&idxd->conf_dev));
device_release_driver(&wq->conf_dev);
}
idxd_unregister_dma_device(idxd);
rc = idxd_device_disable(idxd);
for (i = 0; i < idxd->max_wqs; i++) {
struct idxd_wq *wq = &idxd->wqs[i];
mutex_lock(&wq->wq_lock);
idxd_wq_disable_cleanup(wq);
mutex_unlock(&wq->wq_lock);
}
module_put(THIS_MODULE);
if (rc < 0)
dev_warn(dev, "Device disable failed\n");
else
dev_info(dev, "Device %s disabled\n", dev_name(dev));
}
return 0;
}
static void idxd_config_bus_shutdown(struct device *dev)
{
dev_dbg(dev, "%s called\n", __func__);
}
struct bus_type dsa_bus_type = {
.name = "dsa",
.match = idxd_config_bus_match,
.probe = idxd_config_bus_probe,
.remove = idxd_config_bus_remove,
.shutdown = idxd_config_bus_shutdown,
};
static struct bus_type *idxd_bus_types[] = {
&dsa_bus_type
};
static struct idxd_device_driver dsa_drv = {
.drv = {
.name = "dsa",
.bus = &dsa_bus_type,
.owner = THIS_MODULE,
.mod_name = KBUILD_MODNAME,
},
};
static struct idxd_device_driver *idxd_drvs[] = {
&dsa_drv
};
struct bus_type *idxd_get_bus_type(struct idxd_device *idxd)
{
return idxd_bus_types[idxd->type];
}
static struct device_type *idxd_get_device_type(struct idxd_device *idxd)
{
if (idxd->type == IDXD_TYPE_DSA)
return &dsa_device_type;
else
return NULL;
}
/* IDXD generic driver setup */
int idxd_register_driver(void)
{
int i, rc;
for (i = 0; i < IDXD_TYPE_MAX; i++) {
rc = driver_register(&idxd_drvs[i]->drv);
if (rc < 0)
goto drv_fail;
}
return 0;
drv_fail:
while (--i >= 0)
driver_unregister(&idxd_drvs[i]->drv);
return rc;
}
void idxd_unregister_driver(void)
{
int i;
for (i = 0; i < IDXD_TYPE_MAX; i++)
driver_unregister(&idxd_drvs[i]->drv);
}
/* IDXD engine attributes */
static ssize_t engine_group_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_engine *engine =
container_of(dev, struct idxd_engine, conf_dev);
if (engine->group)
return sprintf(buf, "%d\n", engine->group->id);
else
return sprintf(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 =
container_of(dev, struct idxd_engine, conf_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,
};
/* Group attributes */
static void idxd_set_free_tokens(struct idxd_device *idxd)
{
int i, tokens;
for (i = 0, tokens = 0; i < idxd->max_groups; i++) {
struct idxd_group *g = &idxd->groups[i];
tokens += g->tokens_reserved;
}
idxd->nr_tokens = idxd->max_tokens - tokens;
}
static ssize_t group_tokens_reserved_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
return sprintf(buf, "%u\n", group->tokens_reserved);
}
static ssize_t group_tokens_reserved_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
struct idxd_device *idxd = group->idxd;
unsigned long val;
int rc;
rc = kstrtoul(buf, 10, &val);
if (rc < 0)
return -EINVAL;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (idxd->state == IDXD_DEV_ENABLED)
return -EPERM;
if (val > idxd->max_tokens)
return -EINVAL;
if (val > idxd->nr_tokens + group->tokens_reserved)
return -EINVAL;
group->tokens_reserved = val;
idxd_set_free_tokens(idxd);
return count;
}
static struct device_attribute dev_attr_group_tokens_reserved =
__ATTR(tokens_reserved, 0644, group_tokens_reserved_show,
group_tokens_reserved_store);
static ssize_t group_tokens_allowed_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
return sprintf(buf, "%u\n", group->tokens_allowed);
}
static ssize_t group_tokens_allowed_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
struct idxd_device *idxd = group->idxd;
unsigned long val;
int rc;
rc = kstrtoul(buf, 10, &val);
if (rc < 0)
return -EINVAL;
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->tokens_reserved + idxd->nr_tokens)
return -EINVAL;
group->tokens_allowed = val;
return count;
}
static struct device_attribute dev_attr_group_tokens_allowed =
__ATTR(tokens_allowed, 0644, group_tokens_allowed_show,
group_tokens_allowed_store);
static ssize_t group_use_token_limit_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
return sprintf(buf, "%u\n", group->use_token_limit);
}
static ssize_t group_use_token_limit_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
struct idxd_device *idxd = group->idxd;
unsigned long val;
int rc;
rc = kstrtoul(buf, 10, &val);
if (rc < 0)
return -EINVAL;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (idxd->state == IDXD_DEV_ENABLED)
return -EPERM;
if (idxd->token_limit == 0)
return -EPERM;
group->use_token_limit = !!val;
return count;
}
static struct device_attribute dev_attr_group_use_token_limit =
__ATTR(use_token_limit, 0644, group_use_token_limit_show,
group_use_token_limit_store);
static ssize_t group_engines_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
int i, rc = 0;
char *tmp = buf;
struct idxd_device *idxd = group->idxd;
for (i = 0; i < idxd->max_engines; i++) {
struct idxd_engine *engine = &idxd->engines[i];
if (!engine->group)
continue;
if (engine->group->id == group->id)
rc += sprintf(tmp + rc, "engine%d.%d ",
idxd->id, engine->id);
}
rc--;
rc += sprintf(tmp + rc, "\n");
return rc;
}
static struct device_attribute dev_attr_group_engines =
__ATTR(engines, 0444, group_engines_show, NULL);
static ssize_t group_work_queues_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
int i, rc = 0;
char *tmp = buf;
struct idxd_device *idxd = group->idxd;
for (i = 0; i < idxd->max_wqs; i++) {
struct idxd_wq *wq = &idxd->wqs[i];
if (!wq->group)
continue;
if (wq->group->id == group->id)
rc += sprintf(tmp + rc, "wq%d.%d ",
idxd->id, wq->id);
}
rc--;
rc += sprintf(tmp + rc, "\n");
return rc;
}
static struct device_attribute dev_attr_group_work_queues =
__ATTR(work_queues, 0444, group_work_queues_show, NULL);
static ssize_t group_traffic_class_a_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
return sprintf(buf, "%d\n", group->tc_a);
}
static ssize_t group_traffic_class_a_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
struct idxd_device *idxd = group->idxd;
long val;
int rc;
rc = kstrtol(buf, 10, &val);
if (rc < 0)
return -EINVAL;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (idxd->state == IDXD_DEV_ENABLED)
return -EPERM;
if (val < 0 || val > 7)
return -EINVAL;
group->tc_a = val;
return count;
}
static struct device_attribute dev_attr_group_traffic_class_a =
__ATTR(traffic_class_a, 0644, group_traffic_class_a_show,
group_traffic_class_a_store);
static ssize_t group_traffic_class_b_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
return sprintf(buf, "%d\n", group->tc_b);
}
static ssize_t group_traffic_class_b_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_group *group =
container_of(dev, struct idxd_group, conf_dev);
struct idxd_device *idxd = group->idxd;
long val;
int rc;
rc = kstrtol(buf, 10, &val);
if (rc < 0)
return -EINVAL;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (idxd->state == IDXD_DEV_ENABLED)
return -EPERM;
if (val < 0 || val > 7)
return -EINVAL;
group->tc_b = val;
return count;
}
static struct device_attribute dev_attr_group_traffic_class_b =
__ATTR(traffic_class_b, 0644, group_traffic_class_b_show,
group_traffic_class_b_store);
static struct attribute *idxd_group_attributes[] = {
&dev_attr_group_work_queues.attr,
&dev_attr_group_engines.attr,
&dev_attr_group_use_token_limit.attr,
&dev_attr_group_tokens_allowed.attr,
&dev_attr_group_tokens_reserved.attr,
&dev_attr_group_traffic_class_a.attr,
&dev_attr_group_traffic_class_b.attr,
NULL,
};
static const struct attribute_group idxd_group_attribute_group = {
.attrs = idxd_group_attributes,
};
static const struct attribute_group *idxd_group_attribute_groups[] = {
&idxd_group_attribute_group,
NULL,
};
/* IDXD work queue attribs */
static ssize_t wq_clients_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
return sprintf(buf, "%d\n", wq->client_count);
}
static struct device_attribute dev_attr_wq_clients =
__ATTR(clients, 0444, wq_clients_show, NULL);
static ssize_t wq_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
switch (wq->state) {
case IDXD_WQ_DISABLED:
return sprintf(buf, "disabled\n");
case IDXD_WQ_ENABLED:
return sprintf(buf, "enabled\n");
}
return sprintf(buf, "unknown\n");
}
static struct device_attribute dev_attr_wq_state =
__ATTR(state, 0444, wq_state_show, NULL);
static ssize_t wq_group_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
if (wq->group)
return sprintf(buf, "%u\n", wq->group->id);
else
return sprintf(buf, "-1\n");
}
static ssize_t wq_group_id_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
struct idxd_device *idxd = wq->idxd;
long id;
int rc;
struct idxd_group *prevg, *group;
rc = kstrtol(buf, 10, &id);
if (rc < 0)
return -EINVAL;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (wq->state != IDXD_WQ_DISABLED)
return -EPERM;
if (id > idxd->max_groups - 1 || id < -1)
return -EINVAL;
if (id == -1) {
if (wq->group) {
wq->group->num_wqs--;
wq->group = NULL;
}
return count;
}
group = &idxd->groups[id];
prevg = wq->group;
if (prevg)
prevg->num_wqs--;
wq->group = group;
group->num_wqs++;
return count;
}
static struct device_attribute dev_attr_wq_group_id =
__ATTR(group_id, 0644, wq_group_id_show, wq_group_id_store);
static ssize_t wq_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
return sprintf(buf, "%s\n",
wq_dedicated(wq) ? "dedicated" : "shared");
}
static ssize_t wq_mode_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
struct idxd_device *idxd = wq->idxd;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (wq->state != IDXD_WQ_DISABLED)
return -EPERM;
if (sysfs_streq(buf, "dedicated")) {
set_bit(WQ_FLAG_DEDICATED, &wq->flags);
wq->threshold = 0;
} else {
return -EINVAL;
}
return count;
}
static struct device_attribute dev_attr_wq_mode =
__ATTR(mode, 0644, wq_mode_show, wq_mode_store);
static ssize_t wq_size_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
return sprintf(buf, "%u\n", wq->size);
}
static int total_claimed_wq_size(struct idxd_device *idxd)
{
int i;
int wq_size = 0;
for (i = 0; i < idxd->max_wqs; i++) {
struct idxd_wq *wq = &idxd->wqs[i];
wq_size += wq->size;
}
return wq_size;
}
static ssize_t wq_size_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
unsigned long size;
struct idxd_device *idxd = wq->idxd;
int rc;
rc = kstrtoul(buf, 10, &size);
if (rc < 0)
return -EINVAL;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (wq->state != IDXD_WQ_DISABLED)
return -EPERM;
if (size + total_claimed_wq_size(idxd) - wq->size > idxd->max_wq_size)
return -EINVAL;
wq->size = size;
return count;
}
static struct device_attribute dev_attr_wq_size =
__ATTR(size, 0644, wq_size_show, wq_size_store);
static ssize_t wq_priority_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
return sprintf(buf, "%u\n", wq->priority);
}
static ssize_t wq_priority_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
unsigned long prio;
struct idxd_device *idxd = wq->idxd;
int rc;
rc = kstrtoul(buf, 10, &prio);
if (rc < 0)
return -EINVAL;
if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags))
return -EPERM;
if (wq->state != IDXD_WQ_DISABLED)
return -EPERM;
if (prio > IDXD_MAX_PRIORITY)
return -EINVAL;
wq->priority = prio;
return count;
}
static struct device_attribute dev_attr_wq_priority =
__ATTR(priority, 0644, wq_priority_show, wq_priority_store);
static ssize_t wq_type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct idxd_wq *wq = container_of(dev, struct idxd_wq, conf_dev);
switch (wq->type) {
case IDXD_WQT_KERNEL:
return sprintf(buf, "%s\n",
idxd_wq_type_names[IDXD_WQT_KERNEL]);
case IDXD_WQT_USER:
return sprintf(buf, "%s\n",
idxd_wq_type_names[IDXD_WQT_USER]);
case IDXD_WQT_NONE:
default:
return sprintf(buf, "%s\n",
idxd_wq_type_names[IDXD_WQT_NONE]);
}
return -EINVAL;
}
static ssize_t wq_type_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{