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* [PATCH v3] dcssblk: add dax_operations support
@ 2017-04-19 22:32 Dan Williams
  2017-04-20  3:29 ` kbuild test robot
  2017-04-20 17:05 ` Gerald Schaefer
  0 siblings, 2 replies; 3+ messages in thread
From: Dan Williams @ 2017-04-19 22:32 UTC (permalink / raw)
  To: linux-nvdimm
  Cc: linux-kernel, linux-block, dm-devel, linux-fsdevel, hch, Gerald Schaefer

Setup a dax_dev to have the same lifetime as the dcssblk block device
and add a ->direct_access() method that is equivalent to
dcssblk_direct_access(). Once fs/dax.c has been converted to use
dax_operations the old dcssblk_direct_access() will be removed.

Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
Changes since v2:
* fix return code in the alloc_dax() failure case (Gerald)
* assign dax_dev to dev_info and kill local variable (Gerald)

 drivers/s390/block/Kconfig   |    1 +
 drivers/s390/block/dcssblk.c |   55 +++++++++++++++++++++++++++++++++++-------
 2 files changed, 47 insertions(+), 9 deletions(-)

diff --git a/drivers/s390/block/Kconfig b/drivers/s390/block/Kconfig
index 4a3b62326183..0acb8c2f9475 100644
--- a/drivers/s390/block/Kconfig
+++ b/drivers/s390/block/Kconfig
@@ -14,6 +14,7 @@ config BLK_DEV_XPRAM
 
 config DCSSBLK
 	def_tristate m
+	select DAX
 	prompt "DCSSBLK support"
 	depends on S390 && BLOCK
 	help
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 415d10a67b7a..dc84cfd4e438 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/pfn_t.h>
+#include <linux/dax.h>
 #include <asm/extmem.h>
 #include <asm/io.h>
 
@@ -30,8 +31,10 @@ static int dcssblk_open(struct block_device *bdev, fmode_t mode);
 static void dcssblk_release(struct gendisk *disk, fmode_t mode);
 static blk_qc_t dcssblk_make_request(struct request_queue *q,
 						struct bio *bio);
-static long dcssblk_direct_access(struct block_device *bdev, sector_t secnum,
+static long dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum,
 			 void **kaddr, pfn_t *pfn, long size);
+static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
+		long nr_pages, void **kaddr, pfn_t *pfn);
 
 static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
 
@@ -40,7 +43,11 @@ static const struct block_device_operations dcssblk_devops = {
 	.owner   	= THIS_MODULE,
 	.open    	= dcssblk_open,
 	.release 	= dcssblk_release,
-	.direct_access 	= dcssblk_direct_access,
+	.direct_access 	= dcssblk_blk_direct_access,
+};
+
+static const struct dax_operations dcssblk_dax_ops = {
+	.direct_access = dcssblk_dax_direct_access,
 };
 
 struct dcssblk_dev_info {
@@ -57,6 +64,7 @@ struct dcssblk_dev_info {
 	struct request_queue *dcssblk_queue;
 	int num_of_segments;
 	struct list_head seg_list;
+	struct dax_device *dax_dev;
 };
 
 struct segment_info {
@@ -389,6 +397,8 @@ dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const ch
 	}
 	list_del(&dev_info->lh);
 
+	kill_dax(dev_info->dax_dev);
+	put_dax(dev_info->dax_dev);
 	del_gendisk(dev_info->gd);
 	blk_cleanup_queue(dev_info->dcssblk_queue);
 	dev_info->gd->queue = NULL;
@@ -654,6 +664,13 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
 	if (rc)
 		goto put_dev;
 
+	dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name,
+			&dcssblk_dax_ops);
+	if (!dev_info->dax_dev) {
+		rc = -ENOMEM;
+		goto put_dev;
+	}
+
 	get_device(&dev_info->dev);
 	device_add_disk(&dev_info->dev, dev_info->gd);
 
@@ -752,6 +769,8 @@ dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const ch
 	}
 
 	list_del(&dev_info->lh);
+	kill_dax(dev_info->dax_dev);
+	put_dax(dev_info->dax_dev);
 	del_gendisk(dev_info->gd);
 	blk_cleanup_queue(dev_info->dcssblk_queue);
 	dev_info->gd->queue = NULL;
@@ -883,21 +902,39 @@ dcssblk_make_request(struct request_queue *q, struct bio *bio)
 }
 
 static long
-dcssblk_direct_access (struct block_device *bdev, sector_t secnum,
+__dcssblk_direct_access(struct dcssblk_dev_info *dev_info, pgoff_t pgoff,
+		long nr_pages, void **kaddr, pfn_t *pfn)
+{
+	resource_size_t offset = pgoff * PAGE_SIZE;
+	unsigned long dev_sz;
+
+	dev_sz = dev_info->end - dev_info->start + 1;
+	*kaddr = (void *) dev_info->start + offset;
+	*pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), PFN_DEV);
+
+	return (dev_sz - offset) / PAGE_SIZE;
+}
+
+static long
+dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum,
 			void **kaddr, pfn_t *pfn, long size)
 {
 	struct dcssblk_dev_info *dev_info;
-	unsigned long offset, dev_sz;
 
 	dev_info = bdev->bd_disk->private_data;
 	if (!dev_info)
 		return -ENODEV;
-	dev_sz = dev_info->end - dev_info->start + 1;
-	offset = secnum * 512;
-	*kaddr = (void *) dev_info->start + offset;
-	*pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset), PFN_DEV);
+	return __dcssblk_direct_access(dev_info, PHYS_PFN(secnum * 512),
+			PHYS_PFN(size), kaddr, pfn) * PAGE_SIZE;
+}
+
+static long
+dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
+		long nr_pages, void **kaddr, pfn_t *pfn)
+{
+	struct dcssblk_dev_info *dev_info = dax_get_private(dax_dev);
 
-	return dev_sz - offset;
+	return __dcssblk_direct_access(dev_info, pgoff, nr_pages, kaddr, pfn);
 }
 
 static void

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v3] dcssblk: add dax_operations support
  2017-04-19 22:32 [PATCH v3] dcssblk: add dax_operations support Dan Williams
@ 2017-04-20  3:29 ` kbuild test robot
  2017-04-20 17:05 ` Gerald Schaefer
  1 sibling, 0 replies; 3+ messages in thread
From: kbuild test robot @ 2017-04-20  3:29 UTC (permalink / raw)
  To: Dan Williams
  Cc: kbuild-all, linux-nvdimm, linux-kernel, linux-block, dm-devel,
	linux-fsdevel, hch, Gerald Schaefer

[-- Attachment #1: Type: text/plain, Size: 5533 bytes --]

Hi Dan,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.11-rc7 next-20170419]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dan-Williams/dcssblk-add-dax_operations-support/20170420-090408
config: s390-defconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=s390 

All error/warnings (new ones prefixed by >>):

>> drivers/s390/block/dcssblk.c:36:46: warning: 'struct dax_device' declared inside parameter list will not be visible outside of this definition or declaration
    static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
                                                 ^~~~~~~~~~
>> drivers/s390/block/dcssblk.c:49:21: error: variable 'dcssblk_dax_ops' has initializer but incomplete type
    static const struct dax_operations dcssblk_dax_ops = {
                        ^~~~~~~~~~~~~~
>> drivers/s390/block/dcssblk.c:50:2: error: unknown field 'direct_access' specified in initializer
     .direct_access = dcssblk_dax_direct_access,
     ^
>> drivers/s390/block/dcssblk.c:50:19: warning: excess elements in struct initializer
     .direct_access = dcssblk_dax_direct_access,
                      ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/s390/block/dcssblk.c:50:19: note: (near initialization for 'dcssblk_dax_ops')
   drivers/s390/block/dcssblk.c: In function 'dcssblk_shared_store':
>> drivers/s390/block/dcssblk.c:400:2: error: implicit declaration of function 'kill_dax' [-Werror=implicit-function-declaration]
     kill_dax(dev_info->dax_dev);
     ^~~~~~~~
>> drivers/s390/block/dcssblk.c:401:2: error: implicit declaration of function 'put_dax' [-Werror=implicit-function-declaration]
     put_dax(dev_info->dax_dev);
     ^~~~~~~
   drivers/s390/block/dcssblk.c: In function 'dcssblk_add_store':
>> drivers/s390/block/dcssblk.c:667:22: error: implicit declaration of function 'alloc_dax' [-Werror=implicit-function-declaration]
     dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name,
                         ^~~~~~~~~
>> drivers/s390/block/dcssblk.c:667:20: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     dev_info->dax_dev = alloc_dax(dev_info, dev_info->gd->disk_name,
                       ^
   drivers/s390/block/dcssblk.c: At top level:
   drivers/s390/block/dcssblk.c:932:1: error: conflicting types for 'dcssblk_dax_direct_access'
    dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
    ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/s390/block/dcssblk.c:36:13: note: previous declaration of 'dcssblk_dax_direct_access' was here
    static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
                ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/s390/block/dcssblk.c: In function 'dcssblk_dax_direct_access':
>> drivers/s390/block/dcssblk.c:935:38: error: implicit declaration of function 'dax_get_private' [-Werror=implicit-function-declaration]
     struct dcssblk_dev_info *dev_info = dax_get_private(dax_dev);
                                         ^~~~~~~~~~~~~~~
>> drivers/s390/block/dcssblk.c:935:38: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
   drivers/s390/block/dcssblk.c: At top level:
>> drivers/s390/block/dcssblk.c:49:36: error: storage size of 'dcssblk_dax_ops' isn't known
    static const struct dax_operations dcssblk_dax_ops = {
                                       ^~~~~~~~~~~~~~~
   drivers/s390/block/dcssblk.c:36:13: warning: 'dcssblk_dax_direct_access' used but never defined
    static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
                ^~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/s390/block/dcssblk.c:932:1: warning: 'dcssblk_dax_direct_access' defined but not used [-Wunused-function]
    dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
    ^~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/dcssblk_dax_ops +49 drivers/s390/block/dcssblk.c

    30	static int dcssblk_open(struct block_device *bdev, fmode_t mode);
    31	static void dcssblk_release(struct gendisk *disk, fmode_t mode);
    32	static blk_qc_t dcssblk_make_request(struct request_queue *q,
    33							struct bio *bio);
    34	static long dcssblk_blk_direct_access(struct block_device *bdev, sector_t secnum,
    35				 void **kaddr, pfn_t *pfn, long size);
  > 36	static long dcssblk_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
    37			long nr_pages, void **kaddr, pfn_t *pfn);
    38	
    39	static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0";
    40	
    41	static int dcssblk_major;
    42	static const struct block_device_operations dcssblk_devops = {
    43		.owner   	= THIS_MODULE,
    44		.open    	= dcssblk_open,
    45		.release 	= dcssblk_release,
    46		.direct_access 	= dcssblk_blk_direct_access,
    47	};
    48	
  > 49	static const struct dax_operations dcssblk_dax_ops = {
  > 50		.direct_access = dcssblk_dax_direct_access,
    51	};
    52	
    53	struct dcssblk_dev_info {

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 10807 bytes --]

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v3] dcssblk: add dax_operations support
  2017-04-19 22:32 [PATCH v3] dcssblk: add dax_operations support Dan Williams
  2017-04-20  3:29 ` kbuild test robot
@ 2017-04-20 17:05 ` Gerald Schaefer
  1 sibling, 0 replies; 3+ messages in thread
From: Gerald Schaefer @ 2017-04-20 17:05 UTC (permalink / raw)
  To: Dan Williams
  Cc: linux-nvdimm, linux-kernel, linux-block, dm-devel, linux-fsdevel, hch

On Wed, 19 Apr 2017 15:32:38 -0700
Dan Williams <dan.j.williams@intel.com> wrote:

> Setup a dax_dev to have the same lifetime as the dcssblk block device
> and add a ->direct_access() method that is equivalent to
> dcssblk_direct_access(). Once fs/dax.c has been converted to use
> dax_operations the old dcssblk_direct_access() will be removed.
> 
> Reported-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
> Changes since v2:
> * fix return code in the alloc_dax() failure case (Gerald)
> * assign dax_dev to dev_info and kill local variable (Gerald)
> 
>  drivers/s390/block/Kconfig   |    1 +
>  drivers/s390/block/dcssblk.c |   55 +++++++++++++++++++++++++++++++++++-------
>  2 files changed, 47 insertions(+), 9 deletions(-)

Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2017-04-20 17:06 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2017-04-19 22:32 [PATCH v3] dcssblk: add dax_operations support Dan Williams
2017-04-20  3:29 ` kbuild test robot
2017-04-20 17:05 ` Gerald Schaefer

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