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dax: Introduce alloc_dev_dax_id()

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The reference counting of dax_region objects is needlessly complicated,
has lead to confusion [1], and has hidden a bug [2]. Towards cleaning up
that mess introduce alloc_dev_dax_id() to minimize the holding of a
dax_region reference to only what dev_dax_release() needs, the
dax_region->ida.

Part of the reason for the mess was the design to dereference a
dax_region in all cases in free_dev_dax_id() even if the id was
statically assigned by the upper level dax_region driver. Remove the
need to call "is_static(dax_region)" by tracking whether the id is
dynamic directly in the dev_dax instance itself.

With that flag the dax_region pinning and release per dev_dax instance
can move to alloc_dev_dax_id() and free_dev_dax_id() respectively.

A follow-on cleanup address the unnecessary references in the dax_region
setup and drivers.

Fixes: 0f3da14a4f ("device-dax: introduce 'seed' devices")
Link: http://lore.kernel.org/r/20221203095858.612027-1-liuyongqiang13@huawei.com [1]
Link: http://lore.kernel.org/r/3cf0890b-4eb0-e70e-cd9c-2ecc3d496263@hpe.com [2]
Reported-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Reported-by: Paul Cassella <cassella@hpe.com>
Reported-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/168577284563.1672036.13493034988900989554.stgit@dwillia2-xfh.jf.intel.com
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Dan Williams 2023-06-02 23:14:05 -07:00 committed by Vishal Verma
parent 82b4ceeccb
commit 70aab281e1
2 changed files with 37 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/dax/bus.c
View File

@ -446,18 +446,34 @@ static void unregister_dev_dax(void *dev)
put_device(dev);
}
static void dax_region_free(struct kref *kref)
{
struct dax_region *dax_region;
dax_region = container_of(kref, struct dax_region, kref);
kfree(dax_region);
}
void dax_region_put(struct dax_region *dax_region)
{
kref_put(&dax_region->kref, dax_region_free);
}
EXPORT_SYMBOL_GPL(dax_region_put);
/* a return value >= 0 indicates this invocation invalidated the id */
static int __free_dev_dax_id(struct dev_dax *dev_dax)
{
struct dax_region *dax_region = dev_dax->region;
struct device *dev = &dev_dax->dev;
struct dax_region *dax_region;
int rc = dev_dax->id;
device_lock_assert(dev);
if (is_static(dax_region) || dev_dax->id < 0)
if (!dev_dax->dyn_id || dev_dax->id < 0)
return -1;
dax_region = dev_dax->region;
ida_free(&dax_region->ida, dev_dax->id);
dax_region_put(dax_region);
dev_dax->id = -1;
return rc;
}
@ -473,6 +489,20 @@ static int free_dev_dax_id(struct dev_dax *dev_dax)
return rc;
}
static int alloc_dev_dax_id(struct dev_dax *dev_dax)
{
struct dax_region *dax_region = dev_dax->region;
int id;
id = ida_alloc(&dax_region->ida, GFP_KERNEL);
if (id < 0)
return id;
kref_get(&dax_region->kref);
dev_dax->dyn_id = true;
dev_dax->id = id;
return id;
}
static ssize_t delete_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t len)
{
@ -560,20 +590,6 @@ static const struct attribute_group *dax_region_attribute_groups[] = {
NULL,
};
static void dax_region_free(struct kref *kref)
{
struct dax_region *dax_region;
dax_region = container_of(kref, struct dax_region, kref);
kfree(dax_region);
}
void dax_region_put(struct dax_region *dax_region)
{
kref_put(&dax_region->kref, dax_region_free);
}
EXPORT_SYMBOL_GPL(dax_region_put);
static void dax_region_unregister(void *region)
{
struct dax_region *dax_region = region;
@ -1297,12 +1313,10 @@ static const struct attribute_group *dax_attribute_groups[] = {
static void dev_dax_release(struct device *dev)
{
struct dev_dax *dev_dax = to_dev_dax(dev);
struct dax_region *dax_region = dev_dax->region;
struct dax_device *dax_dev = dev_dax->dax_dev;
put_dax(dax_dev);
free_dev_dax_id(dev_dax);
dax_region_put(dax_region);
kfree(dev_dax->pgmap);
kfree(dev_dax);
}
@ -1326,6 +1340,7 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
if (!dev_dax)
return ERR_PTR(-ENOMEM);
dev_dax->region = dax_region;
if (is_static(dax_region)) {
if (dev_WARN_ONCE(parent, data->id < 0,
"dynamic id specified to static region\n")) {
@ -1341,13 +1356,11 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
goto err_id;
}
rc = ida_alloc(&dax_region->ida, GFP_KERNEL);
rc = alloc_dev_dax_id(dev_dax);
if (rc < 0)
goto err_id;
dev_dax->id = rc;
}
dev_dax->region = dax_region;
dev = &dev_dax->dev;
device_initialize(dev);
dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id);
@ -1388,7 +1401,6 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
dev_dax->target_node = dax_region->target_node;
dev_dax->align = dax_region->align;
ida_init(&dev_dax->ida);
kref_get(&dax_region->kref);
inode = dax_inode(dax_dev);
dev->devt = inode->i_rdev;

4
drivers/dax/dax-private.h
View File

@ -52,7 +52,8 @@ struct dax_mapping {
* @region - parent region
* @dax_dev - core dax functionality
* @target_node: effective numa node if dev_dax memory range is onlined
* @id: ida allocated id
* @dyn_id: is this a dynamic or statically created instance
* @id: ida allocated id when the dax_region is not static
* @ida: mapping id allocator
* @dev - device core
* @pgmap - pgmap for memmap setup / lifetime (driver owned)
@ -64,6 +65,7 @@ struct dev_dax {
struct dax_device *dax_dev;
unsigned int align;
int target_node;
bool dyn_id;
int id;
struct ida ida;
struct device dev;