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Date: Mon, 28 Feb 2022 18:49:17 -0800 From: Dan Williams <dan.j.williams@...el.com> To: gregkh@...uxfoundation.org, rafael.j.wysocki@...el.com Cc: Alison Schofield <alison.schofield@...el.com>, Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, Ben Widawsky <ben.widawsky@...el.com>, linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org, nvdimm@...ts.linux.dev Subject: [PATCH 05/11] cxl/core: Introduce cxl_set_lock_class() Update CONFIG_PROVE_CXL_LOCKING to use the common device-core helpers for device_lock validation. When CONFIG_PROVE_LOCKING is enabled and device_set_lock_class() is passed a non-zero lock class the core acquires the 'struct device' @lockdep_mutex everywhere it acquires the device_lock. Where lockdep_mutex does not skip lockdep validation like device_lock. cxl_set_lock_class() wraps device_set_lock_class() as to not collide with other subsystems that may also support this lockdep validation scheme. See the 'choice' for the various CONFIG_PROVE_$SUBSYS_LOCKING options in lib/Kconfig.debug. Cc: Alison Schofield <alison.schofield@...el.com> Cc: Vishal Verma <vishal.l.verma@...el.com> Cc: Ira Weiny <ira.weiny@...el.com> Cc: Ben Widawsky <ben.widawsky@...el.com> Signed-off-by: Dan Williams <dan.j.williams@...el.com> --- drivers/cxl/core/memdev.c | 1 + drivers/cxl/core/pmem.c | 2 ++ drivers/cxl/core/port.c | 2 ++ drivers/cxl/core/region.c | 1 + drivers/cxl/cxl.h | 9 +++++++++ 5 files changed, 15 insertions(+) diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index 1f76b28f9826..ad8c9f61c38a 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -343,6 +343,7 @@ struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds) cxlmd->cxlds = cxlds; cdev = &cxlmd->cdev; + cxl_set_lock_class(dev); rc = cdev_device_add(cdev, dev); if (rc) goto err; diff --git a/drivers/cxl/core/pmem.c b/drivers/cxl/core/pmem.c index c3d7e6ce3fdf..e0bdda788b01 100644 --- a/drivers/cxl/core/pmem.c +++ b/drivers/cxl/core/pmem.c @@ -171,6 +171,7 @@ struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host, if (rc) goto err; + cxl_set_lock_class(dev); rc = device_add(dev); if (rc) goto err; @@ -283,6 +284,7 @@ int devm_cxl_add_nvdimm(struct device *host, struct cxl_memdev *cxlmd) if (rc) goto err; + cxl_set_lock_class(dev); rc = device_add(dev); if (rc) goto err; diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 44006d8eb64d..5eee7de1c7f9 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -507,6 +507,7 @@ struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport, if (rc) goto err; + cxl_set_lock_class(dev); rc = device_add(dev); if (rc) goto err; @@ -1389,6 +1390,7 @@ int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map) if (is_root_decoder(dev)) cxld->platform_res.name = dev_name(dev); + cxl_set_lock_class(dev); return device_add(dev); } EXPORT_SYMBOL_NS_GPL(cxl_decoder_add_locked, CXL); diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index b1a4ba622739..f0a821de94cf 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -476,6 +476,7 @@ int cxl_add_region(struct cxl_decoder *cxld, struct cxl_region *cxlr) if (rc) goto err; + cxl_set_lock_class(dev); rc = device_add(dev); if (rc) goto err; diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 1357a245037d..f94eff659cce 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -543,5 +543,14 @@ static inline int cxl_lock_class(struct device *dev) else return CXL_ANON_LOCK; } + +static inline void cxl_set_lock_class(struct device *dev) +{ + device_set_lock_class(dev, cxl_lock_class(dev)); +} +#else +static inline void cxl_set_lock_class(struct device *dev) +{ +} #endif #endif /* __CXL_H__ */
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