diff mbox series

[v17,12/12] null_blk: add support for copy offload

Message ID 20231019110147.31672-13-nj.shetty@samsung.com (mailing list archive)
State Not Applicable
Headers show
Series [v17,01/12] block: Introduce queue limits and sysfs for copy-offload support | expand

Commit Message

Nitesh Shetty Oct. 19, 2023, 11:01 a.m. UTC
Implementation is based on existing read and write infrastructure.
copy_max_bytes: A new configfs and module parameter is introduced, which
can be used to set hardware/driver supported maximum copy limit.
Only request based queue mode will support for copy offload.
Added tracefs support to copy IO tracing.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Suggested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>
---
 Documentation/block/null_blk.rst  |  5 ++
 drivers/block/null_blk/main.c     | 97 ++++++++++++++++++++++++++++++-
 drivers/block/null_blk/null_blk.h |  1 +
 drivers/block/null_blk/trace.h    | 23 ++++++++
 4 files changed, 123 insertions(+), 3 deletions(-)

Comments

kernel test robot Oct. 19, 2023, 4:35 p.m. UTC | #1
Hi Nitesh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 213f891525c222e8ed145ce1ce7ae1f47921cb9c]

url:    https://github.com/intel-lab-lkp/linux/commits/Nitesh-Shetty/block-Introduce-queue-limits-and-sysfs-for-copy-offload-support/20231019-200658
base:   213f891525c222e8ed145ce1ce7ae1f47921cb9c
patch link:    https://lore.kernel.org/r/20231019110147.31672-13-nj.shetty%40samsung.com
patch subject: [PATCH v17 12/12] null_blk: add support for copy offload
config: parisc-allyesconfig (https://download.01.org/0day-ci/archive/20231020/202310200001.UU0bBx9w-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231020/202310200001.UU0bBx9w-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310200001.UU0bBx9w-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/trace/define_trace.h:102,
                    from drivers/block/null_blk/trace.h:104,
                    from drivers/block/null_blk/main.c:15:
   drivers/block/null_blk/./trace.h: In function 'trace_raw_output_nullb_copy_op':
>> drivers/block/null_blk/./trace.h:91:27: warning: format '%lu' expects argument of type 'long unsigned int', but argument 7 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
      91 |                 TP_printk("%s req=%-15s: dst=%llu, src=%llu, len=%lu",
         |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/trace/trace_events.h:203:34: note: in definition of macro 'DECLARE_EVENT_CLASS'
     203 |         trace_event_printf(iter, print);                                \
         |                                  ^~~~~
   include/trace/trace_events.h:45:30: note: in expansion of macro 'PARAMS'
      45 |                              PARAMS(print));                   \
         |                              ^~~~~~
   drivers/block/null_blk/./trace.h:73:1: note: in expansion of macro 'TRACE_EVENT'
      73 | TRACE_EVENT(nullb_copy_op,
         | ^~~~~~~~~~~
   drivers/block/null_blk/./trace.h:91:17: note: in expansion of macro 'TP_printk'
      91 |                 TP_printk("%s req=%-15s: dst=%llu, src=%llu, len=%lu",
         |                 ^~~~~~~~~
   In file included from include/trace/trace_events.h:237:
   drivers/block/null_blk/./trace.h:91:68: note: format string is defined here
      91 |                 TP_printk("%s req=%-15s: dst=%llu, src=%llu, len=%lu",
         |                                                                  ~~^
         |                                                                    |
         |                                                                    long unsigned int
         |                                                                  %u


vim +91 drivers/block/null_blk/./trace.h

    72	
    73	TRACE_EVENT(nullb_copy_op,
    74			TP_PROTO(struct request *req,
    75				 sector_t dst, sector_t src, size_t len),
    76			TP_ARGS(req, dst, src, len),
    77			TP_STRUCT__entry(
    78					 __array(char, disk, DISK_NAME_LEN)
    79					 __field(enum req_op, op)
    80					 __field(sector_t, dst)
    81					 __field(sector_t, src)
    82					 __field(size_t, len)
    83			),
    84			TP_fast_assign(
    85				       __entry->op = req_op(req);
    86				       __assign_disk_name(__entry->disk, req->q->disk);
    87				       __entry->dst = dst;
    88				       __entry->src = src;
    89				       __entry->len = len;
    90			),
  > 91			TP_printk("%s req=%-15s: dst=%llu, src=%llu, len=%lu",
    92				  __print_disk_name(__entry->disk),
    93				  blk_op_str(__entry->op),
    94				  __entry->dst, __entry->src, __entry->len)
    95	);
    96	#endif /* _TRACE_NULLB_H */
    97
kernel test robot Nov. 6, 2023, 9:11 p.m. UTC | #2
Hi Nitesh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 213f891525c222e8ed145ce1ce7ae1f47921cb9c]

url:    https://github.com/intel-lab-lkp/linux/commits/Nitesh-Shetty/block-Introduce-queue-limits-and-sysfs-for-copy-offload-support/20231019-200658
base:   213f891525c222e8ed145ce1ce7ae1f47921cb9c
patch link:    https://lore.kernel.org/r/20231019110147.31672-13-nj.shetty%40samsung.com
patch subject: [PATCH v17 12/12] null_blk: add support for copy offload
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20231107/202311070508.mIPbaEHa-lkp@intel.com/config)
compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231107/202311070508.mIPbaEHa-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311070508.mIPbaEHa-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/block/null_blk/main.c:15:
   In file included from drivers/block/null_blk/trace.h:104:
   In file included from include/trace/define_trace.h:102:
   In file included from include/trace/trace_events.h:237:
>> drivers/block/null_blk/trace.h:94:34: warning: format specifies type 'unsigned long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat]
                             __entry->dst, __entry->src, __entry->len)
                             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
   include/trace/stages/stage3_trace_output.h:6:17: note: expanded from macro '__entry'
   #define __entry field
                   ^
   include/trace/stages/stage3_trace_output.h:9:43: note: expanded from macro 'TP_printk'
   #define TP_printk(fmt, args...) fmt "\n", args
                                   ~~~       ^
   include/trace/trace_events.h:45:16: note: expanded from macro 'TRACE_EVENT'
                                PARAMS(print));                   \
                                ~~~~~~~^~~~~~~
   include/linux/tracepoint.h:107:25: note: expanded from macro 'PARAMS'
   #define PARAMS(args...) args
                           ^~~~
   include/trace/trace_events.h:203:27: note: expanded from macro 'DECLARE_EVENT_CLASS'
           trace_event_printf(iter, print);                                \
                                    ^~~~~
   1 warning generated.


vim +94 drivers/block/null_blk/trace.h

    72	
    73	TRACE_EVENT(nullb_copy_op,
    74			TP_PROTO(struct request *req,
    75				 sector_t dst, sector_t src, size_t len),
    76			TP_ARGS(req, dst, src, len),
    77			TP_STRUCT__entry(
    78					 __array(char, disk, DISK_NAME_LEN)
    79					 __field(enum req_op, op)
    80					 __field(sector_t, dst)
    81					 __field(sector_t, src)
    82					 __field(size_t, len)
    83			),
    84			TP_fast_assign(
    85				       __entry->op = req_op(req);
    86				       __assign_disk_name(__entry->disk, req->q->disk);
    87				       __entry->dst = dst;
    88				       __entry->src = src;
    89				       __entry->len = len;
    90			),
    91			TP_printk("%s req=%-15s: dst=%llu, src=%llu, len=%lu",
    92				  __print_disk_name(__entry->disk),
    93				  blk_op_str(__entry->op),
  > 94				  __entry->dst, __entry->src, __entry->len)
    95	);
    96	#endif /* _TRACE_NULLB_H */
    97
diff mbox series

Patch

diff --git a/Documentation/block/null_blk.rst b/Documentation/block/null_blk.rst
index 4dd78f24d10a..6153e02fcf13 100644
--- a/Documentation/block/null_blk.rst
+++ b/Documentation/block/null_blk.rst
@@ -149,3 +149,8 @@  zone_size=[MB]: Default: 256
 zone_nr_conv=[nr_conv]: Default: 0
   The number of conventional zones to create when block device is zoned.  If
   zone_nr_conv >= nr_zones, it will be reduced to nr_zones - 1.
+
+copy_max_bytes=[size in bytes]: Default: COPY_MAX_BYTES
+  A module and configfs parameter which can be used to set hardware/driver
+  supported maximum copy offload limit.
+  COPY_MAX_BYTES(=128MB at present) is defined in fs.h
diff --git a/drivers/block/null_blk/main.c b/drivers/block/null_blk/main.c
index c56bef0edc5e..22361f4d5f71 100644
--- a/drivers/block/null_blk/main.c
+++ b/drivers/block/null_blk/main.c
@@ -160,6 +160,10 @@  static int g_max_sectors;
 module_param_named(max_sectors, g_max_sectors, int, 0444);
 MODULE_PARM_DESC(max_sectors, "Maximum size of a command (in 512B sectors)");
 
+static unsigned long g_copy_max_bytes = BLK_COPY_MAX_BYTES;
+module_param_named(copy_max_bytes, g_copy_max_bytes, ulong, 0444);
+MODULE_PARM_DESC(copy_max_bytes, "Maximum size of a copy command (in bytes)");
+
 static unsigned int nr_devices = 1;
 module_param(nr_devices, uint, 0444);
 MODULE_PARM_DESC(nr_devices, "Number of devices to register");
@@ -412,6 +416,7 @@  NULLB_DEVICE_ATTR(home_node, uint, NULL);
 NULLB_DEVICE_ATTR(queue_mode, uint, NULL);
 NULLB_DEVICE_ATTR(blocksize, uint, NULL);
 NULLB_DEVICE_ATTR(max_sectors, uint, NULL);
+NULLB_DEVICE_ATTR(copy_max_bytes, uint, NULL);
 NULLB_DEVICE_ATTR(irqmode, uint, NULL);
 NULLB_DEVICE_ATTR(hw_queue_depth, uint, NULL);
 NULLB_DEVICE_ATTR(index, uint, NULL);
@@ -553,6 +558,7 @@  static struct configfs_attribute *nullb_device_attrs[] = {
 	&nullb_device_attr_queue_mode,
 	&nullb_device_attr_blocksize,
 	&nullb_device_attr_max_sectors,
+	&nullb_device_attr_copy_max_bytes,
 	&nullb_device_attr_irqmode,
 	&nullb_device_attr_hw_queue_depth,
 	&nullb_device_attr_index,
@@ -659,7 +665,8 @@  static ssize_t memb_group_features_show(struct config_item *item, char *page)
 			"poll_queues,power,queue_mode,shared_tag_bitmap,size,"
 			"submit_queues,use_per_node_hctx,virt_boundary,zoned,"
 			"zone_capacity,zone_max_active,zone_max_open,"
-			"zone_nr_conv,zone_offline,zone_readonly,zone_size\n");
+			"zone_nr_conv,zone_offline,zone_readonly,zone_size,"
+			"copy_max_bytes\n");
 }
 
 CONFIGFS_ATTR_RO(memb_group_, features);
@@ -725,6 +732,7 @@  static struct nullb_device *null_alloc_dev(void)
 	dev->queue_mode = g_queue_mode;
 	dev->blocksize = g_bs;
 	dev->max_sectors = g_max_sectors;
+	dev->copy_max_bytes = g_copy_max_bytes;
 	dev->irqmode = g_irqmode;
 	dev->hw_queue_depth = g_hw_queue_depth;
 	dev->blocking = g_blocking;
@@ -1274,6 +1282,81 @@  static int null_transfer(struct nullb *nullb, struct page *page,
 	return err;
 }
 
+static inline int nullb_setup_copy(struct nullb *nullb, struct request *req,
+				   bool is_fua)
+{
+	sector_t sector_in = 0, sector_out = 0;
+	loff_t offset_in, offset_out;
+	void *in, *out;
+	ssize_t chunk, rem = 0;
+	struct bio *bio;
+	struct nullb_page *t_page_in, *t_page_out;
+	u16 seg = 1;
+	int status = -EIO;
+
+	if (blk_rq_nr_phys_segments(req) != BLK_COPY_MAX_SEGMENTS)
+		return status;
+
+	/*
+	 * First bio contains information about source and last bio contains
+	 * information about destination.
+	 */
+	__rq_for_each_bio(bio, req) {
+		if (seg == blk_rq_nr_phys_segments(req)) {
+			sector_out = bio->bi_iter.bi_sector;
+			if (rem != bio->bi_iter.bi_size)
+				return status;
+		} else {
+			sector_in = bio->bi_iter.bi_sector;
+			rem = bio->bi_iter.bi_size;
+		}
+		seg++;
+	}
+
+	trace_nullb_copy_op(req, sector_out << SECTOR_SHIFT,
+			    sector_in << SECTOR_SHIFT, rem);
+
+	spin_lock_irq(&nullb->lock);
+	while (rem > 0) {
+		chunk = min_t(size_t, nullb->dev->blocksize, rem);
+		offset_in = (sector_in & SECTOR_MASK) << SECTOR_SHIFT;
+		offset_out = (sector_out & SECTOR_MASK) << SECTOR_SHIFT;
+
+		if (null_cache_active(nullb) && !is_fua)
+			null_make_cache_space(nullb, PAGE_SIZE);
+
+		t_page_in = null_lookup_page(nullb, sector_in, false,
+					     !null_cache_active(nullb));
+		if (!t_page_in)
+			goto err;
+		t_page_out = null_insert_page(nullb, sector_out,
+					      !null_cache_active(nullb) ||
+					      is_fua);
+		if (!t_page_out)
+			goto err;
+
+		in = kmap_local_page(t_page_in->page);
+		out = kmap_local_page(t_page_out->page);
+
+		memcpy(out + offset_out, in + offset_in, chunk);
+		kunmap_local(out);
+		kunmap_local(in);
+		__set_bit(sector_out & SECTOR_MASK, t_page_out->bitmap);
+
+		if (is_fua)
+			null_free_sector(nullb, sector_out, true);
+
+		rem -= chunk;
+		sector_in += chunk >> SECTOR_SHIFT;
+		sector_out += chunk >> SECTOR_SHIFT;
+	}
+
+	status = 0;
+err:
+	spin_unlock_irq(&nullb->lock);
+	return status;
+}
+
 static int null_handle_rq(struct nullb_cmd *cmd)
 {
 	struct request *rq = cmd->rq;
@@ -1283,13 +1366,16 @@  static int null_handle_rq(struct nullb_cmd *cmd)
 	sector_t sector = blk_rq_pos(rq);
 	struct req_iterator iter;
 	struct bio_vec bvec;
+	bool fua = rq->cmd_flags & REQ_FUA;
+
+	if (op_is_copy(req_op(rq)))
+		return nullb_setup_copy(nullb, rq, fua);
 
 	spin_lock_irq(&nullb->lock);
 	rq_for_each_segment(bvec, rq, iter) {
 		len = bvec.bv_len;
 		err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset,
-				     op_is_write(req_op(rq)), sector,
-				     rq->cmd_flags & REQ_FUA);
+				    op_is_write(req_op(rq)), sector, fua);
 		if (err) {
 			spin_unlock_irq(&nullb->lock);
 			return err;
@@ -2053,6 +2139,9 @@  static int null_validate_conf(struct nullb_device *dev)
 		return -EINVAL;
 	}
 
+	if (dev->queue_mode == NULL_Q_BIO)
+		dev->copy_max_bytes = 0;
+
 	return 0;
 }
 
@@ -2172,6 +2261,8 @@  static int null_add_dev(struct nullb_device *dev)
 		dev->max_sectors = queue_max_hw_sectors(nullb->q);
 	dev->max_sectors = min(dev->max_sectors, BLK_DEF_MAX_SECTORS);
 	blk_queue_max_hw_sectors(nullb->q, dev->max_sectors);
+	blk_queue_max_copy_hw_sectors(nullb->q,
+				      dev->copy_max_bytes >> SECTOR_SHIFT);
 
 	if (dev->virt_boundary)
 		blk_queue_virt_boundary(nullb->q, PAGE_SIZE - 1);
diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h
index 929f659dd255..e82e53a2e2df 100644
--- a/drivers/block/null_blk/null_blk.h
+++ b/drivers/block/null_blk/null_blk.h
@@ -107,6 +107,7 @@  struct nullb_device {
 	unsigned int queue_mode; /* block interface */
 	unsigned int blocksize; /* block size */
 	unsigned int max_sectors; /* Max sectors per command */
+	unsigned long copy_max_bytes; /* Max copy offload length in bytes */
 	unsigned int irqmode; /* IRQ completion handler */
 	unsigned int hw_queue_depth; /* queue depth */
 	unsigned int index; /* index of the disk, only valid with a disk */
diff --git a/drivers/block/null_blk/trace.h b/drivers/block/null_blk/trace.h
index 91446c34eac2..2f2c1d1c2b48 100644
--- a/drivers/block/null_blk/trace.h
+++ b/drivers/block/null_blk/trace.h
@@ -70,6 +70,29 @@  TRACE_EVENT(nullb_report_zones,
 );
 #endif /* CONFIG_BLK_DEV_ZONED */
 
+TRACE_EVENT(nullb_copy_op,
+		TP_PROTO(struct request *req,
+			 sector_t dst, sector_t src, size_t len),
+		TP_ARGS(req, dst, src, len),
+		TP_STRUCT__entry(
+				 __array(char, disk, DISK_NAME_LEN)
+				 __field(enum req_op, op)
+				 __field(sector_t, dst)
+				 __field(sector_t, src)
+				 __field(size_t, len)
+		),
+		TP_fast_assign(
+			       __entry->op = req_op(req);
+			       __assign_disk_name(__entry->disk, req->q->disk);
+			       __entry->dst = dst;
+			       __entry->src = src;
+			       __entry->len = len;
+		),
+		TP_printk("%s req=%-15s: dst=%llu, src=%llu, len=%lu",
+			  __print_disk_name(__entry->disk),
+			  blk_op_str(__entry->op),
+			  __entry->dst, __entry->src, __entry->len)
+);
 #endif /* _TRACE_NULLB_H */
 
 #undef TRACE_INCLUDE_PATH