*
* * ``/sys/kernel/dmabuf/buffers/<inode_number>/exporter_name``
* * ``/sys/kernel/dmabuf/buffers/<inode_number>/size``
- * * ``/sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attach_uid>/device``
- * * ``/sys/kernel/dmabuf/buffers/<inode_number>/attachments/<attach_uid>/map_counter``
*
- * The information in the interface can also be used to derive per-exporter and
- * per-device usage statistics. The data from the interface can be gathered
- * on error conditions or other important events to provide a snapshot of
- * DMA-BUF usage. It can also be collected periodically by telemetry to monitor
- * various metrics.
+ * The information in the interface can also be used to derive per-exporter
+ * statistics. The data from the interface can be gathered on error conditions
+ * or other important events to provide a snapshot of DMA-BUF usage.
+ * It can also be collected periodically by telemetry to monitor various metrics.
*
* Detailed documentation about the interface is present in
* Documentation/ABI/testing/sysfs-kernel-dmabuf-buffers.
.default_groups = dma_buf_stats_default_groups,
};
-#define to_dma_buf_attach_entry_from_kobj(x) container_of(x, struct dma_buf_attach_sysfs_entry, kobj)
-
-struct dma_buf_attach_stats_attribute {
- struct attribute attr;
- ssize_t (*show)(struct dma_buf_attach_sysfs_entry *sysfs_entry,
- struct dma_buf_attach_stats_attribute *attr, char *buf);
-};
-#define to_dma_buf_attach_stats_attr(x) container_of(x, struct dma_buf_attach_stats_attribute, attr)
-
-static ssize_t dma_buf_attach_stats_attribute_show(struct kobject *kobj,
- struct attribute *attr,
- char *buf)
-{
- struct dma_buf_attach_stats_attribute *attribute;
- struct dma_buf_attach_sysfs_entry *sysfs_entry;
-
- attribute = to_dma_buf_attach_stats_attr(attr);
- sysfs_entry = to_dma_buf_attach_entry_from_kobj(kobj);
-
- if (!attribute->show)
- return -EIO;
-
- return attribute->show(sysfs_entry, attribute, buf);
-}
-
-static const struct sysfs_ops dma_buf_attach_stats_sysfs_ops = {
- .show = dma_buf_attach_stats_attribute_show,
-};
-
-static ssize_t map_counter_show(struct dma_buf_attach_sysfs_entry *sysfs_entry,
- struct dma_buf_attach_stats_attribute *attr,
- char *buf)
-{
- return sysfs_emit(buf, "%u\n", sysfs_entry->map_counter);
-}
-
-static struct dma_buf_attach_stats_attribute map_counter_attribute =
- __ATTR_RO(map_counter);
-
-static struct attribute *dma_buf_attach_stats_default_attrs[] = {
- &map_counter_attribute.attr,
- NULL,
-};
-ATTRIBUTE_GROUPS(dma_buf_attach_stats_default);
-
-static void dma_buf_attach_sysfs_release(struct kobject *kobj)
-{
- struct dma_buf_attach_sysfs_entry *sysfs_entry;
-
- sysfs_entry = to_dma_buf_attach_entry_from_kobj(kobj);
- kfree(sysfs_entry);
-}
-
-static struct kobj_type dma_buf_attach_ktype = {
- .sysfs_ops = &dma_buf_attach_stats_sysfs_ops,
- .release = dma_buf_attach_sysfs_release,
- .default_groups = dma_buf_attach_stats_default_groups,
-};
-
-void dma_buf_attach_stats_teardown(struct dma_buf_attachment *attach)
-{
- struct dma_buf_attach_sysfs_entry *sysfs_entry;
-
- sysfs_entry = attach->sysfs_entry;
- if (!sysfs_entry)
- return;
-
- sysfs_delete_link(&sysfs_entry->kobj, &attach->dev->kobj, "device");
-
- kobject_del(&sysfs_entry->kobj);
- kobject_put(&sysfs_entry->kobj);
-}
-
-int dma_buf_attach_stats_setup(struct dma_buf_attachment *attach,
- unsigned int uid)
-{
- struct dma_buf_attach_sysfs_entry *sysfs_entry;
- int ret;
- struct dma_buf *dmabuf;
-
- if (!attach)
- return -EINVAL;
-
- dmabuf = attach->dmabuf;
-
- sysfs_entry = kzalloc(sizeof(struct dma_buf_attach_sysfs_entry),
- GFP_KERNEL);
- if (!sysfs_entry)
- return -ENOMEM;
-
- sysfs_entry->kobj.kset = dmabuf->sysfs_entry->attach_stats_kset;
-
- attach->sysfs_entry = sysfs_entry;
-
- ret = kobject_init_and_add(&sysfs_entry->kobj, &dma_buf_attach_ktype,
- NULL, "%u", uid);
- if (ret)
- goto kobj_err;
-
- ret = sysfs_create_link(&sysfs_entry->kobj, &attach->dev->kobj,
- "device");
- if (ret)
- goto link_err;
-
- return 0;
-
-link_err:
- kobject_del(&sysfs_entry->kobj);
-kobj_err:
- kobject_put(&sysfs_entry->kobj);
- attach->sysfs_entry = NULL;
-
- return ret;
-}
void dma_buf_stats_teardown(struct dma_buf *dmabuf)
{
struct dma_buf_sysfs_entry *sysfs_entry;
if (!sysfs_entry)
return;
- kset_unregister(sysfs_entry->attach_stats_kset);
kobject_del(&sysfs_entry->kobj);
kobject_put(&sysfs_entry->kobj);
}
{
struct dma_buf_sysfs_entry *sysfs_entry;
int ret;
- struct kset *attach_stats_kset;
if (!dmabuf || !dmabuf->file)
return -EINVAL;
if (ret)
goto err_sysfs_dmabuf;
- /* create the directory for attachment stats */
- attach_stats_kset = kset_create_and_add("attachments",
- &dmabuf_sysfs_no_uevent_ops,
- &sysfs_entry->kobj);
- if (!attach_stats_kset) {
- ret = -ENOMEM;
- goto err_sysfs_attach;
- }
-
- sysfs_entry->attach_stats_kset = attach_stats_kset;
-
return 0;
-err_sysfs_attach:
- kobject_del(&sysfs_entry->kobj);
err_sysfs_dmabuf:
kobject_put(&sysfs_entry->kobj);
dmabuf->sysfs_entry = NULL;
void dma_buf_uninit_sysfs_statistics(void);
int dma_buf_stats_setup(struct dma_buf *dmabuf);
-int dma_buf_attach_stats_setup(struct dma_buf_attachment *attach,
- unsigned int uid);
-static inline void dma_buf_update_attachment_map_count(struct dma_buf_attachment *attach,
- int delta)
-{
- struct dma_buf_attach_sysfs_entry *entry = attach->sysfs_entry;
- entry->map_counter += delta;
-}
void dma_buf_stats_teardown(struct dma_buf *dmabuf);
-void dma_buf_attach_stats_teardown(struct dma_buf_attachment *attach);
-static inline unsigned int dma_buf_update_attach_uid(struct dma_buf *dmabuf)
-{
- struct dma_buf_sysfs_entry *entry = dmabuf->sysfs_entry;
-
- return entry->attachment_uid++;
-}
#else
static inline int dma_buf_init_sysfs_statistics(void)
{
return 0;
}
-static inline int dma_buf_attach_stats_setup(struct dma_buf_attachment *attach,
- unsigned int uid)
-{
- return 0;
-}
static inline void dma_buf_stats_teardown(struct dma_buf *dmabuf) {}
-static inline void dma_buf_attach_stats_teardown(struct dma_buf_attachment *attach) {}
-static inline void dma_buf_update_attachment_map_count(struct dma_buf_attachment *attach,
- int delta) {}
-static inline unsigned int dma_buf_update_attach_uid(struct dma_buf *dmabuf)
-{
- return 0;
-}
#endif
#endif // _DMA_BUF_SYSFS_STATS_H
{
struct dma_buf_attachment *attach;
int ret;
- unsigned int attach_uid;
if (WARN_ON(!dmabuf || !dev))
return ERR_PTR(-EINVAL);
}
dma_resv_lock(dmabuf->resv, NULL);
list_add(&attach->node, &dmabuf->attachments);
- attach_uid = dma_buf_update_attach_uid(dmabuf);
dma_resv_unlock(dmabuf->resv);
- ret = dma_buf_attach_stats_setup(attach, attach_uid);
- if (ret)
- goto err_sysfs;
-
/* When either the importer or the exporter can't handle dynamic
* mappings we cache the mapping here to avoid issues with the
* reservation object lock.
dma_resv_unlock(attach->dmabuf->resv);
attach->sgt = sgt;
attach->dir = DMA_BIDIRECTIONAL;
- dma_buf_update_attachment_map_count(attach, 1 /* delta */);
}
return attach;
if (dma_buf_is_dynamic(attach->dmabuf))
dma_resv_unlock(attach->dmabuf->resv);
-err_sysfs:
dma_buf_detach(dmabuf, attach);
return ERR_PTR(ret);
}
dma_resv_lock(attach->dmabuf->resv, NULL);
__unmap_dma_buf(attach, attach->sgt, attach->dir);
- dma_buf_update_attachment_map_count(attach, -1 /* delta */);
if (dma_buf_is_dynamic(attach->dmabuf)) {
dmabuf->ops->unpin(attach);
if (dmabuf->ops->detach)
dmabuf->ops->detach(dmabuf, attach);
- dma_buf_attach_stats_teardown(attach);
kfree(attach);
}
EXPORT_SYMBOL_GPL(dma_buf_detach);
}
}
#endif /* CONFIG_DMA_API_DEBUG */
-
- if (!IS_ERR(sg_table))
- dma_buf_update_attachment_map_count(attach, 1 /* delta */);
-
return sg_table;
}
EXPORT_SYMBOL_GPL(dma_buf_map_attachment);
if (dma_buf_is_dynamic(attach->dmabuf) &&
!IS_ENABLED(CONFIG_DMABUF_MOVE_NOTIFY))
dma_buf_unpin(attach);
-
- dma_buf_update_attachment_map_count(attach, -1 /* delta */);
}
EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment);
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