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Date: Tue, 23 Feb 2016 18:17:14 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: linux-nvdimm@...ts.01.org
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/8] libnvdimm: async notification support
In preparation for asynchronous address range scrub support add an ability for
the pmem driver to dynamically consume address range scrub results.
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
drivers/nvdimm/bus.c | 26 ++++++++++++++++++++++++++
drivers/nvdimm/nd.h | 2 ++
drivers/nvdimm/pmem.c | 15 +++++++++++++++
drivers/nvdimm/region.c | 12 ++++++++++++
include/linux/nd.h | 7 +++++++
5 files changed, 62 insertions(+)
diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index c3ba888e3e3a..2508251439e7 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -133,6 +133,32 @@ static int nvdimm_bus_remove(struct device *dev)
return rc;
}
+void nd_device_notify(struct device *dev, enum nvdimm_event event)
+{
+ device_lock(dev);
+ if (dev->driver) {
+ struct nd_device_driver *nd_drv;
+
+ nd_drv = to_nd_device_driver(dev->driver);
+ if (nd_drv->notify)
+ nd_drv->notify(dev, event);
+ }
+ device_unlock(dev);
+}
+EXPORT_SYMBOL(nd_device_notify);
+
+void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event)
+{
+ struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(&nd_region->dev);
+
+ if (!nvdimm_bus)
+ return;
+
+ /* caller is responsible for holding a reference on the device */
+ nd_device_notify(&nd_region->dev, event);
+}
+EXPORT_SYMBOL_GPL(nvdimm_region_notify);
+
static struct bus_type nvdimm_bus_type = {
.name = "nd",
.uevent = nvdimm_bus_uevent,
diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
index ba1633b9da31..78b82f6dd191 100644
--- a/drivers/nvdimm/nd.h
+++ b/drivers/nvdimm/nd.h
@@ -18,6 +18,7 @@
#include <linux/mutex.h>
#include <linux/ndctl.h>
#include <linux/types.h>
+#include <linux/nd.h>
#include "label.h"
enum {
@@ -168,6 +169,7 @@ int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
void wait_nvdimm_bus_probe_idle(struct device *dev);
void nd_device_register(struct device *dev);
void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
+void nd_device_notify(struct device *dev, enum nvdimm_event event);
int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
size_t len);
ssize_t nd_sector_size_show(unsigned long current_lbasize,
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 8d0b54670184..efc2a5e671c6 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -488,12 +488,27 @@ static int nd_pmem_remove(struct device *dev)
return 0;
}
+static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
+{
+ struct pmem_device *pmem = dev_get_drvdata(dev);
+ struct nd_namespace_common *ndns = pmem->ndns;
+
+ if (event != NVDIMM_REVALIDATE_POISON)
+ return;
+
+ if (is_nd_btt(dev))
+ nvdimm_namespace_add_poison(ndns, &pmem->bb, 0);
+ else
+ nvdimm_namespace_add_poison(ndns, &pmem->bb, pmem->data_offset);
+}
+
MODULE_ALIAS("pmem");
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
static struct nd_device_driver nd_pmem_driver = {
.probe = nd_pmem_probe,
.remove = nd_pmem_remove,
+ .notify = nd_pmem_notify,
.drv = {
.name = "nd_pmem",
},
diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
index 7da63eac78ee..4b7715e29cff 100644
--- a/drivers/nvdimm/region.c
+++ b/drivers/nvdimm/region.c
@@ -93,9 +93,21 @@ static int nd_region_remove(struct device *dev)
return 0;
}
+static int child_notify(struct device *dev, void *data)
+{
+ nd_device_notify(dev, *(enum nvdimm_event *) data);
+ return 0;
+}
+
+static void nd_region_notify(struct device *dev, enum nvdimm_event event)
+{
+ device_for_each_child(dev, &event, child_notify);
+}
+
static struct nd_device_driver nd_region_driver = {
.probe = nd_region_probe,
.remove = nd_region_remove,
+ .notify = nd_region_notify,
.drv = {
.name = "nd_region",
},
diff --git a/include/linux/nd.h b/include/linux/nd.h
index 507e47c86737..5489ab756d1a 100644
--- a/include/linux/nd.h
+++ b/include/linux/nd.h
@@ -16,11 +16,16 @@
#include <linux/ndctl.h>
#include <linux/device.h>
+enum nvdimm_event {
+ NVDIMM_REVALIDATE_POISON,
+};
+
struct nd_device_driver {
struct device_driver drv;
unsigned long type;
int (*probe)(struct device *dev);
int (*remove)(struct device *dev);
+ void (*notify)(struct device *dev, enum nvdimm_event event);
};
static inline struct nd_device_driver *to_nd_device_driver(
@@ -144,6 +149,8 @@ static inline int nvdimm_write_bytes(struct nd_namespace_common *ndns,
MODULE_ALIAS("nd:t" __stringify(type) "*")
#define ND_DEVICE_MODALIAS_FMT "nd:t%d"
+struct nd_region;
+void nvdimm_region_notify(struct nd_region *nd_region, enum nvdimm_event event);
int __must_check __nd_driver_register(struct nd_device_driver *nd_drv,
struct module *module, const char *mod_name);
#define nd_driver_register(driver) \
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