In preparation for moving lockdep_mutex nested lock acquisition into the
core, remove the cxl_device_lock() wrapper, but preserve
cxl_lock_class() that will be used to inform the core of the subsystem's
lock ordering rules.
Cc: Alison Schofield <[email protected]>
Cc: Vishal Verma <[email protected]>
Cc: Ira Weiny <[email protected]>
Cc: Ben Widawsky <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
---
drivers/cxl/core/pmem.c | 4 ++--
drivers/cxl/core/port.c | 50 ++++++++++++++++++++++-------------------------
drivers/cxl/cxl.h | 46 -------------------------------------------
drivers/cxl/mem.c | 4 ++--
drivers/cxl/pmem.c | 12 ++++++-----
lib/Kconfig.debug | 2 +-
6 files changed, 34 insertions(+), 84 deletions(-)
diff --git a/drivers/cxl/core/pmem.c b/drivers/cxl/core/pmem.c
index 58dc6fba3130..c3d7e6ce3fdf 100644
--- a/drivers/cxl/core/pmem.c
+++ b/drivers/cxl/core/pmem.c
@@ -127,10 +127,10 @@ static void unregister_nvb(void *_cxl_nvb)
* work to flush. Once the state has been changed to 'dead' then no new
* work can be queued by user-triggered bind.
*/
- cxl_device_lock(&cxl_nvb->dev);
+ device_lock(&cxl_nvb->dev);
flush = cxl_nvb->state != CXL_NVB_NEW;
cxl_nvb->state = CXL_NVB_DEAD;
- cxl_device_unlock(&cxl_nvb->dev);
+ device_unlock(&cxl_nvb->dev);
/*
* Even though the device core will trigger device_release_driver()
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index d48d44e911c1..44006d8eb64d 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -350,10 +350,10 @@ static void cxl_port_release(struct device *dev)
struct cxl_port *port = to_cxl_port(dev);
struct cxl_ep *ep, *_e;
- cxl_device_lock(dev);
+ device_lock(dev);
list_for_each_entry_safe(ep, _e, &port->endpoints, list)
cxl_ep_release(ep);
- cxl_device_unlock(dev);
+ device_unlock(dev);
ida_free(&cxl_port_ida, port->id);
kfree(port);
}
@@ -592,7 +592,7 @@ static int match_root_child(struct device *dev, const void *match)
return 0;
port = to_cxl_port(dev);
- cxl_device_lock(dev);
+ device_lock(dev);
list_for_each_entry(dport, &port->dports, list) {
iter = match;
while (iter) {
@@ -602,7 +602,7 @@ static int match_root_child(struct device *dev, const void *match)
}
}
out:
- cxl_device_unlock(dev);
+ device_unlock(dev);
return !!iter;
}
@@ -661,13 +661,13 @@ static int add_dport(struct cxl_port *port, struct cxl_dport *new)
static void cond_cxl_root_lock(struct cxl_port *port)
{
if (is_cxl_root(port))
- cxl_device_lock(&port->dev);
+ device_lock(&port->dev);
}
static void cond_cxl_root_unlock(struct cxl_port *port)
{
if (is_cxl_root(port))
- cxl_device_unlock(&port->dev);
+ device_unlock(&port->dev);
}
static void cxl_dport_remove(void *data)
@@ -775,15 +775,15 @@ static int add_ep(struct cxl_port *port, struct cxl_ep *new)
{
struct cxl_ep *dup;
- cxl_device_lock(&port->dev);
+ device_lock(&port->dev);
if (port->dead) {
- cxl_device_unlock(&port->dev);
+ device_unlock(&port->dev);
return -ENXIO;
}
dup = find_ep(port, new->ep);
if (!dup)
list_add_tail(&new->list, &port->endpoints);
- cxl_device_unlock(&port->dev);
+ device_unlock(&port->dev);
return dup ? -EEXIST : 0;
}
@@ -893,12 +893,12 @@ static void delete_endpoint(void *data)
goto out;
parent = &parent_port->dev;
- cxl_device_lock(parent);
+ device_lock(parent);
if (parent->driver && endpoint->uport) {
devm_release_action(parent, cxl_unlink_uport, endpoint);
devm_release_action(parent, unregister_port, endpoint);
}
- cxl_device_unlock(parent);
+ device_unlock(parent);
put_device(parent);
out:
put_device(&endpoint->dev);
@@ -956,7 +956,7 @@ static void cxl_detach_ep(void *data)
}
parent_port = to_cxl_port(port->dev.parent);
- cxl_device_lock(&parent_port->dev);
+ device_lock(&parent_port->dev);
if (!parent_port->dev.driver) {
/*
* The bottom-up race to delete the port lost to a
@@ -964,12 +964,12 @@ static void cxl_detach_ep(void *data)
* parent_port ->remove() will have cleaned up all
* descendants.
*/
- cxl_device_unlock(&parent_port->dev);
+ device_unlock(&parent_port->dev);
put_device(&port->dev);
continue;
}
- cxl_device_lock(&port->dev);
+ device_lock(&port->dev);
ep = find_ep(port, &cxlmd->dev);
dev_dbg(&cxlmd->dev, "disconnect %s from %s\n",
ep ? dev_name(ep->ep) : "", dev_name(&port->dev));
@@ -984,7 +984,7 @@ static void cxl_detach_ep(void *data)
port->dead = true;
list_splice_init(&port->dports, &reap_dports);
}
- cxl_device_unlock(&port->dev);
+ device_unlock(&port->dev);
if (!list_empty(&reap_dports)) {
dev_dbg(&cxlmd->dev, "delete %s\n",
@@ -992,7 +992,7 @@ static void cxl_detach_ep(void *data)
delete_switch_port(port, &reap_dports);
}
put_device(&port->dev);
- cxl_device_unlock(&parent_port->dev);
+ device_unlock(&parent_port->dev);
}
}
@@ -1040,7 +1040,7 @@ static int add_port_attach_ep(struct cxl_memdev *cxlmd,
return -EAGAIN;
}
- cxl_device_lock(&parent_port->dev);
+ device_lock(&parent_port->dev);
if (!parent_port->dev.driver) {
dev_warn(&cxlmd->dev,
"port %s:%s disabled, failed to enumerate CXL.mem\n",
@@ -1058,7 +1058,7 @@ static int add_port_attach_ep(struct cxl_memdev *cxlmd,
get_device(&port->dev);
}
out:
- cxl_device_unlock(&parent_port->dev);
+ device_unlock(&parent_port->dev);
if (IS_ERR(port))
rc = PTR_ERR(port);
@@ -1169,14 +1169,14 @@ struct cxl_dport *cxl_find_dport_by_dev(struct cxl_port *port,
{
struct cxl_dport *dport;
- cxl_device_lock(&port->dev);
+ device_lock(&port->dev);
list_for_each_entry(dport, &port->dports, list)
if (dport->dport == dev) {
- cxl_device_unlock(&port->dev);
+ device_unlock(&port->dev);
return dport;
}
- cxl_device_unlock(&port->dev);
+ device_unlock(&port->dev);
return NULL;
}
EXPORT_SYMBOL_NS_GPL(cxl_find_dport_by_dev, CXL);
@@ -1419,9 +1419,9 @@ int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map)
port = to_cxl_port(cxld->dev.parent);
- cxl_device_lock(&port->dev);
+ device_lock(&port->dev);
rc = cxl_decoder_add_locked(cxld, target_map);
- cxl_device_unlock(&port->dev);
+ device_unlock(&port->dev);
return rc;
}
@@ -1566,7 +1566,6 @@ static int cxl_bus_probe(struct device *dev)
* Take the CXL nested lock since the driver core only holds
* @dev->mutex and not @dev->lockdep_mutex.
*/
- cxl_nested_lock(dev);
if (id == CXL_DEVICE_REGION) {
/* Regions cannot bind until parameters are set */
struct cxl_region *cxlr = to_cxl_region(dev);
@@ -1576,7 +1575,6 @@ static int cxl_bus_probe(struct device *dev)
} else {
rc = to_cxl_drv(dev->driver)->probe(dev);
}
- cxl_nested_unlock(dev);
dev_dbg(dev, "probe: %d\n", rc);
@@ -1587,10 +1585,8 @@ static void cxl_bus_remove(struct device *dev)
{
struct cxl_driver *cxl_drv = to_cxl_drv(dev->driver);
- cxl_nested_lock(dev);
if (cxl_drv->remove)
cxl_drv->remove(dev);
- cxl_nested_unlock(dev);
}
static struct workqueue_struct *cxl_bus_wq;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index ca8a61a623b7..97e6ca7e4940 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -530,51 +530,5 @@ static inline int cxl_lock_class(struct device *dev)
else
return CXL_ANON_LOCK;
}
-
-static inline void cxl_nested_lock(struct device *dev)
-{
- mutex_lock_nested(&dev->lockdep_mutex, cxl_lock_class(dev));
-}
-
-static inline void cxl_nested_unlock(struct device *dev)
-{
- mutex_unlock(&dev->lockdep_mutex);
-}
-
-static inline void cxl_device_lock(struct device *dev)
-{
- /*
- * For double lock errors the lockup will happen before lockdep
- * warns at cxl_nested_lock(), so assert explicitly.
- */
- lockdep_assert_not_held(&dev->lockdep_mutex);
-
- device_lock(dev);
- cxl_nested_lock(dev);
-}
-
-static inline void cxl_device_unlock(struct device *dev)
-{
- cxl_nested_unlock(dev);
- device_unlock(dev);
-}
-#else
-static inline void cxl_nested_lock(struct device *dev)
-{
-}
-
-static inline void cxl_nested_unlock(struct device *dev)
-{
-}
-
-static inline void cxl_device_lock(struct device *dev)
-{
- device_lock(dev);
-}
-
-static inline void cxl_device_unlock(struct device *dev)
-{
- device_unlock(dev);
-}
#endif
#endif /* __CXL_H__ */
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index 415f351629c8..a68c8f203626 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -207,7 +207,7 @@ static int cxl_mem_probe(struct device *dev)
return -ENXIO;
}
- cxl_device_lock(&parent_port->dev);
+ device_lock(&parent_port->dev);
if (!parent_port->dev.driver) {
dev_err(dev, "CXL port topology %s not enabled\n",
dev_name(&parent_port->dev));
@@ -226,7 +226,7 @@ static int cxl_mem_probe(struct device *dev)
rc = devm_add_action_or_reset(dev, delete_memdev, cxlmd);
out:
- cxl_device_unlock(&parent_port->dev);
+ device_unlock(&parent_port->dev);
put_device(&parent_port->dev);
return rc;
}
diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c
index fabdb0c6dbf2..564d125d25ef 100644
--- a/drivers/cxl/pmem.c
+++ b/drivers/cxl/pmem.c
@@ -43,7 +43,7 @@ static int cxl_nvdimm_probe(struct device *dev)
if (!cxl_nvb)
return -ENXIO;
- cxl_device_lock(&cxl_nvb->dev);
+ device_lock(&cxl_nvb->dev);
if (!cxl_nvb->nvdimm_bus) {
rc = -ENXIO;
goto out;
@@ -68,7 +68,7 @@ static int cxl_nvdimm_probe(struct device *dev)
dev_set_drvdata(dev, nvdimm);
rc = devm_add_action_or_reset(dev, unregister_nvdimm, nvdimm);
out:
- cxl_device_unlock(&cxl_nvb->dev);
+ device_unlock(&cxl_nvb->dev);
put_device(&cxl_nvb->dev);
return rc;
@@ -233,7 +233,7 @@ static void cxl_nvb_update_state(struct work_struct *work)
struct nvdimm_bus *victim_bus = NULL;
bool release = false, rescan = false;
- cxl_device_lock(&cxl_nvb->dev);
+ device_lock(&cxl_nvb->dev);
switch (cxl_nvb->state) {
case CXL_NVB_ONLINE:
if (!online_nvdimm_bus(cxl_nvb)) {
@@ -251,7 +251,7 @@ static void cxl_nvb_update_state(struct work_struct *work)
default:
break;
}
- cxl_device_unlock(&cxl_nvb->dev);
+ device_unlock(&cxl_nvb->dev);
if (release)
device_release_driver(&cxl_nvb->dev);
@@ -327,9 +327,9 @@ static int cxl_nvdimm_bridge_reset(struct device *dev, void *data)
return 0;
cxl_nvb = to_cxl_nvdimm_bridge(dev);
- cxl_device_lock(dev);
+ device_lock(dev);
cxl_nvb->state = CXL_NVB_NEW;
- cxl_device_unlock(dev);
+ device_unlock(dev);
return 0;
}
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7dea203964f7..5942b22d7f1b 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1535,7 +1535,7 @@ config PROVE_CXL_LOCKING
bool "CXL"
depends on CXL_BUS
help
- Enable lockdep to validate cxl_device_lock() usage.
+ Enable lockdep to validate CXL subsystem usage of the device lock.
endchoice
On Mon, 28 Feb 2022 18:49:06 -0800
Dan Williams <[email protected]> wrote:
> In preparation for moving lockdep_mutex nested lock acquisition into the
> core, remove the cxl_device_lock() wrapper, but preserve
> cxl_lock_class() that will be used to inform the core of the subsystem's
> lock ordering rules.
>
> Cc: Alison Schofield <[email protected]>
> Cc: Vishal Verma <[email protected]>
> Cc: Ira Weiny <[email protected]>
> Cc: Ben Widawsky <[email protected]>
> Signed-off-by: Dan Williams <[email protected]>
Makes sense, but perhaps the description should call out that after
this patch it's not just a wrapper remove, but rather the lock
checking is totally gone for now?
Otherwise this looks fine to me. FWIW
Reviewed-by: Jonathan Cameron <[email protected]>
On Wed, Mar 9, 2022 at 10:22 AM Jonathan Cameron
<[email protected]> wrote:
>
> On Mon, 28 Feb 2022 18:49:06 -0800
> Dan Williams <[email protected]> wrote:
>
> > In preparation for moving lockdep_mutex nested lock acquisition into the
> > core, remove the cxl_device_lock() wrapper, but preserve
> > cxl_lock_class() that will be used to inform the core of the subsystem's
> > lock ordering rules.
> >
> > Cc: Alison Schofield <[email protected]>
> > Cc: Vishal Verma <[email protected]>
> > Cc: Ira Weiny <[email protected]>
> > Cc: Ben Widawsky <[email protected]>
> > Signed-off-by: Dan Williams <[email protected]>
>
> Makes sense, but perhaps the description should call out that after
> this patch it's not just a wrapper remove, but rather the lock
> checking is totally gone for now?
Sure, that's worth a note.
>
> Otherwise this looks fine to me. FWIW
> Reviewed-by: Jonathan Cameron <[email protected]>