Setup a dax_inode to have the same lifetime as the pmem block device and
add a ->direct_access() method that is equivalent to
pmem_direct_access(). Once fs/dax.c has been converted to use
dax_operations the old pmem_direct_access() will be removed.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/dax/dax.h | 7 -----
drivers/nvdimm/Kconfig | 1 +
drivers/nvdimm/pmem.c | 55 +++++++++++++++++++++++++++++++--------
drivers/nvdimm/pmem.h | 7 ++++-
include/linux/dax.h | 6 ++++
tools/testing/nvdimm/pmem-dax.c | 12 ++++-----
6 files changed, 61 insertions(+), 27 deletions(-)
diff --git a/drivers/dax/dax.h b/drivers/dax/dax.h
index aeb1d49aafb8..b4c686d2d446 100644
--- a/drivers/dax/dax.h
+++ b/drivers/dax/dax.h
@@ -13,15 +13,8 @@
#ifndef __DAX_H__
#define __DAX_H__
struct dax_inode;
-struct dax_operations;
-struct dax_inode *alloc_dax_inode(void *private, const char *host,
- const struct dax_operations *ops);
-void put_dax_inode(struct dax_inode *dax_inode);
-bool dax_inode_alive(struct dax_inode *dax_inode);
-void kill_dax_inode(struct dax_inode *dax_inode);
struct dax_inode *inode_to_dax_inode(struct inode *inode);
struct inode *dax_inode_to_inode(struct dax_inode *dax_inode);
-void *dax_inode_get_private(struct dax_inode *dax_inode);
int dax_inode_register(struct dax_inode *dax_inode,
const struct file_operations *fops, struct module *owner,
struct kobject *parent);
diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig
index 59e750183b7f..5bdd499b5f4f 100644
--- a/drivers/nvdimm/Kconfig
+++ b/drivers/nvdimm/Kconfig
@@ -20,6 +20,7 @@ if LIBNVDIMM
config BLK_DEV_PMEM
tristate "PMEM: Persistent memory block device support"
default LIBNVDIMM
+ select DAX
select ND_BTT if BTT
select ND_PFN if NVDIMM_PFN
help
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 5b536be5a12e..d3d7de645e20 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -28,6 +28,7 @@
#include <linux/pfn_t.h>
#include <linux/slab.h>
#include <linux/pmem.h>
+#include <linux/dax.h>
#include <linux/nd.h>
#include "pmem.h"
#include "pfn.h"
@@ -199,13 +200,12 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector,
}
/* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
-__weak long pmem_direct_access(struct block_device *bdev, sector_t sector,
- void **kaddr, pfn_t *pfn, long size)
+__weak long __pmem_direct_access(struct pmem_device *pmem, phys_addr_t dev_addr,
+ void **kaddr, pfn_t *pfn, long size)
{
- struct pmem_device *pmem = bdev->bd_queue->queuedata;
- resource_size_t offset = sector * 512 + pmem->data_offset;
+ resource_size_t offset = dev_addr + pmem->data_offset;
- if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
+ if (unlikely(is_bad_pmem(&pmem->bb, dev_addr / 512, size)))
return -EIO;
*kaddr = pmem->virt_addr + offset;
*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
@@ -219,22 +219,46 @@ __weak long pmem_direct_access(struct block_device *bdev, sector_t sector,
return pmem->size - pmem->pfn_pad - offset;
}
+static long pmem_blk_direct_access(struct block_device *bdev, sector_t sector,
+ void **kaddr, pfn_t *pfn, long size)
+{
+ struct pmem_device *pmem = bdev->bd_queue->queuedata;
+
+ return __pmem_direct_access(pmem, sector * 512, kaddr, pfn, size);
+}
+
static const struct block_device_operations pmem_fops = {
.owner = THIS_MODULE,
.rw_page = pmem_rw_page,
- .direct_access = pmem_direct_access,
+ .direct_access = pmem_blk_direct_access,
.revalidate_disk = nvdimm_revalidate_disk,
};
+static long pmem_dax_direct_access(struct dax_inode *dax_inode,
+ phys_addr_t dev_addr, void **kaddr, pfn_t *pfn, long size)
+{
+ struct pmem_device *pmem = dax_inode_get_private(dax_inode);
+
+ return __pmem_direct_access(pmem, dev_addr, kaddr, pfn, size);
+}
+
+static const struct dax_operations pmem_dax_ops = {
+ .direct_access = pmem_dax_direct_access,
+};
+
static void pmem_release_queue(void *q)
{
blk_cleanup_queue(q);
}
-static void pmem_release_disk(void *disk)
+static void pmem_release_disk(void *__pmem)
{
- del_gendisk(disk);
- put_disk(disk);
+ struct pmem_device *pmem = __pmem;
+
+ kill_dax_inode(pmem->dax_inode);
+ put_dax_inode(pmem->dax_inode);
+ del_gendisk(pmem->disk);
+ put_disk(pmem->disk);
}
static int pmem_attach_disk(struct device *dev,
@@ -245,6 +269,7 @@ static int pmem_attach_disk(struct device *dev,
struct vmem_altmap __altmap, *altmap = NULL;
struct resource *res = &nsio->res;
struct nd_pfn *nd_pfn = NULL;
+ struct dax_inode *dax_inode;
int nid = dev_to_node(dev);
struct nd_pfn_sb *pfn_sb;
struct pmem_device *pmem;
@@ -325,6 +350,7 @@ static int pmem_attach_disk(struct device *dev,
disk = alloc_disk_node(0, nid);
if (!disk)
return -ENOMEM;
+ pmem->disk = disk;
disk->fops = &pmem_fops;
disk->queue = q;
@@ -336,9 +362,16 @@ static int pmem_attach_disk(struct device *dev,
return -ENOMEM;
nvdimm_badblocks_populate(nd_region, &pmem->bb, res);
disk->bb = &pmem->bb;
- device_add_disk(dev, disk);
- if (devm_add_action_or_reset(dev, pmem_release_disk, disk))
+ dax_inode = alloc_dax_inode(pmem, disk->disk_name, &pmem_dax_ops);
+ if (!dax_inode) {
+ put_disk(disk);
+ return -ENOMEM;
+ }
+ pmem->dax_inode = dax_inode;
+
+ device_add_disk(dev, disk);
+ if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
return -ENOMEM;
revalidate_disk(disk);
diff --git a/drivers/nvdimm/pmem.h b/drivers/nvdimm/pmem.h
index b4ee4f71b4a1..a26ade213eb5 100644
--- a/drivers/nvdimm/pmem.h
+++ b/drivers/nvdimm/pmem.h
@@ -5,8 +5,6 @@
#include <linux/pfn_t.h>
#include <linux/fs.h>
-long pmem_direct_access(struct block_device *bdev, sector_t sector,
- void **kaddr, pfn_t *pfn, long size);
/* this definition is in it's own header for tools/testing/nvdimm to consume */
struct pmem_device {
/* One contiguous memory region per device */
@@ -20,5 +18,10 @@ struct pmem_device {
/* trim size when namespace capacity has been section aligned */
u32 pfn_pad;
struct badblocks bb;
+ struct dax_inode *dax_inode;
+ struct gendisk *disk;
};
+
+long __pmem_direct_access(struct pmem_device *pmem, phys_addr_t dev_addr,
+ void **kaddr, pfn_t *pfn, long size);
#endif /* __NVDIMM_PMEM_H__ */
diff --git a/include/linux/dax.h b/include/linux/dax.h
index def9a9d118c9..5aa620e8e5a2 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -16,6 +16,12 @@ struct dax_operations {
int dax_read_lock(void);
void dax_read_unlock(int id);
struct dax_inode *dax_get_by_host(const char *host);
+struct dax_inode *alloc_dax_inode(void *private, const char *host,
+ const struct dax_operations *ops);
+void *dax_inode_get_private(struct dax_inode *dax_inode);
+void put_dax_inode(struct dax_inode *dax_inode);
+bool dax_inode_alive(struct dax_inode *dax_inode);
+void kill_dax_inode(struct dax_inode *dax_inode);
/*
* We use lowest available bit in exceptional entry for locking, one bit for
diff --git a/tools/testing/nvdimm/pmem-dax.c b/tools/testing/nvdimm/pmem-dax.c
index c9b8c48f85fc..2c93836c169e 100644
--- a/tools/testing/nvdimm/pmem-dax.c
+++ b/tools/testing/nvdimm/pmem-dax.c
@@ -15,13 +15,12 @@
#include <pmem.h>
#include <nd.h>
-long pmem_direct_access(struct block_device *bdev, sector_t sector,
+long __pmem_direct_access(struct pmem_device *pmem, phys_addr_t dev_addr,
void **kaddr, pfn_t *pfn, long size)
{
- struct pmem_device *pmem = bdev->bd_queue->queuedata;
- resource_size_t offset = sector * 512 + pmem->data_offset;
+ resource_size_t offset = dev_addr + pmem->data_offset;
- if (unlikely(is_bad_pmem(&pmem->bb, sector, size)))
+ if (unlikely(is_bad_pmem(&pmem->bb, dev_addr / 512, size)))
return -EIO;
/*
@@ -34,9 +33,8 @@ long pmem_direct_access(struct block_device *bdev, sector_t sector,
*kaddr = pmem->virt_addr + offset;
page = vmalloc_to_page(pmem->virt_addr + offset);
*pfn = page_to_pfn_t(page);
- dev_dbg_ratelimited(disk_to_dev(bdev->bd_disk)->parent,
- "%s: sector: %#llx pfn: %#lx\n", __func__,
- (unsigned long long) sector, page_to_pfn(page));
+ pr_debug_ratelimited("%s: pmem: %p dev_addr: %pa pfn: %#lx\n",
+ __func__, pmem, &dev_addr, page_to_pfn(page));
return PAGE_SIZE;
}
--
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