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SMTP id 03.D9.18916.D0CA8F46; Thu, 7 Sep 2023 01:42:53 +0900 (KST) Received: from green245.sa.corp.samsungelectronics.net (unknown [107.99.41.245]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20230906164250epsmtip2679d08d4fd4005d5e89be7677af09db6~CXOoYb_4R0104301043epsmtip2O; Wed, 6 Sep 2023 16:42:50 +0000 (GMT) From: Nitesh Shetty To: Jens Axboe , Jonathan Corbet , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Keith Busch , Christoph Hellwig , Sagi Grimberg , Chaitanya Kulkarni , Alexander Viro , Christian Brauner Cc: martin.petersen@oracle.com, mcgrof@kernel.org, gost.dev@samsung.com, Nitesh Shetty , Hannes Reinecke , Kanchan Joshi , Anuj Gupta , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v15 01/12] block: Introduce queue limits and sysfs for copy-offload support Date: Wed, 6 Sep 2023 22:08:26 +0530 Message-Id: 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Reflected X-CMS-RootMailID: 20230906164253epcas5p32862e8384bdd566881d2c155757cb056 References: <20230906163844.18754-1-nj.shetty@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Add device limits as sysfs entries, - copy_max_bytes (RW) - copy_max_hw_bytes (RO) Above limits help to split the copy payload in block layer. copy_max_bytes: maximum total length of copy in single payload. copy_max_hw_bytes: Reflects the device supported maximum limit. Reviewed-by: Hannes Reinecke Signed-off-by: Nitesh Shetty Signed-off-by: Kanchan Joshi Signed-off-by: Anuj Gupta Reviewed-by: Luis Chamberlain --- Documentation/ABI/stable/sysfs-block | 23 ++++++++++++++++++ block/blk-settings.c | 24 +++++++++++++++++++ block/blk-sysfs.c | 36 ++++++++++++++++++++++++++++ include/linux/blkdev.h | 13 ++++++++++ 4 files changed, 96 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index 1fe9a553c37b..96ba701e57da 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -155,6 +155,29 @@ Description: last zone of the device which may be smaller. +What: /sys/block//queue/copy_max_bytes +Date: August 2023 +Contact: linux-block@vger.kernel.org +Description: + [RW] This is the maximum number of bytes that the block layer + will allow for a copy request. This is always smaller or + equal to the maximum size allowed by the hardware, indicated by + 'copy_max_hw_bytes'. An attempt to set a value higher than + 'copy_max_hw_bytes' will truncate this to 'copy_max_hw_bytes'. + Writing '0' to this file will disable offloading copies for this + device, instead copy is done via emulation. + + +What: /sys/block//queue/copy_max_hw_bytes +Date: August 2023 +Contact: linux-block@vger.kernel.org +Description: + [RO] This is the maximum number of bytes that the hardware + will allow for single data copy request. + A value of 0 means that the device does not support + copy offload. + + What: /sys/block//queue/crypto/ Date: February 2022 Contact: linux-block@vger.kernel.org diff --git a/block/blk-settings.c b/block/blk-settings.c index 0046b447268f..4441711ac364 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -59,6 +59,8 @@ void blk_set_default_limits(struct queue_limits *lim) lim->zoned = BLK_ZONED_NONE; lim->zone_write_granularity = 0; lim->dma_alignment = 511; + lim->max_copy_hw_sectors = 0; + lim->max_copy_sectors = 0; } /** @@ -82,6 +84,8 @@ void blk_set_stacking_limits(struct queue_limits *lim) lim->max_dev_sectors = UINT_MAX; lim->max_write_zeroes_sectors = UINT_MAX; lim->max_zone_append_sectors = UINT_MAX; + lim->max_copy_hw_sectors = UINT_MAX; + lim->max_copy_sectors = UINT_MAX; } EXPORT_SYMBOL(blk_set_stacking_limits); @@ -183,6 +187,22 @@ void blk_queue_max_discard_sectors(struct request_queue *q, } EXPORT_SYMBOL(blk_queue_max_discard_sectors); +/* + * blk_queue_max_copy_hw_sectors - set max sectors for a single copy payload + * @q: the request queue for the device + * @max_copy_sectors: maximum number of sectors to copy + */ +void blk_queue_max_copy_hw_sectors(struct request_queue *q, + unsigned int max_copy_sectors) +{ + if (max_copy_sectors > (BLK_COPY_MAX_BYTES >> SECTOR_SHIFT)) + max_copy_sectors = BLK_COPY_MAX_BYTES >> SECTOR_SHIFT; + + q->limits.max_copy_hw_sectors = max_copy_sectors; + q->limits.max_copy_sectors = max_copy_sectors; +} +EXPORT_SYMBOL_GPL(blk_queue_max_copy_hw_sectors); + /** * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase * @q: the request queue for the device @@ -578,6 +598,10 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, t->max_segment_size = min_not_zero(t->max_segment_size, b->max_segment_size); + t->max_copy_sectors = min(t->max_copy_sectors, b->max_copy_sectors); + t->max_copy_hw_sectors = min(t->max_copy_hw_sectors, + b->max_copy_hw_sectors); + t->misaligned |= b->misaligned; alignment = queue_limit_alignment_offset(b, start); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 63e481262336..4840e21adefa 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -199,6 +199,37 @@ static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *pag return queue_var_show(0, page); } +static ssize_t queue_copy_hw_max_show(struct request_queue *q, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long) + q->limits.max_copy_hw_sectors << SECTOR_SHIFT); +} + +static ssize_t queue_copy_max_show(struct request_queue *q, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long) + q->limits.max_copy_sectors << SECTOR_SHIFT); +} + +static ssize_t queue_copy_max_store(struct request_queue *q, const char *page, + size_t count) +{ + unsigned long max_copy; + ssize_t ret = queue_var_store(&max_copy, page, count); + + if (ret < 0) + return ret; + + if (max_copy & (queue_logical_block_size(q) - 1)) + return -EINVAL; + + max_copy >>= SECTOR_SHIFT; + q->limits.max_copy_sectors = min_t(unsigned int, max_copy, + q->limits.max_copy_hw_sectors); + + return count; +} + static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) { return queue_var_show(0, page); @@ -517,6 +548,9 @@ QUEUE_RO_ENTRY(queue_nr_zones, "nr_zones"); QUEUE_RO_ENTRY(queue_max_open_zones, "max_open_zones"); QUEUE_RO_ENTRY(queue_max_active_zones, "max_active_zones"); +QUEUE_RO_ENTRY(queue_copy_hw_max, "copy_max_hw_bytes"); +QUEUE_RW_ENTRY(queue_copy_max, "copy_max_bytes"); + QUEUE_RW_ENTRY(queue_nomerges, "nomerges"); QUEUE_RW_ENTRY(queue_rq_affinity, "rq_affinity"); QUEUE_RW_ENTRY(queue_poll, "io_poll"); @@ -633,6 +667,8 @@ static struct attribute *queue_attrs[] = { &queue_discard_max_entry.attr, &queue_discard_max_hw_entry.attr, &queue_discard_zeroes_data_entry.attr, + &queue_copy_hw_max_entry.attr, + &queue_copy_max_entry.attr, &queue_write_same_max_entry.attr, &queue_write_zeroes_max_entry.attr, &queue_zone_append_max_entry.attr, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index eef450f25982..7548f1685ee9 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -309,6 +309,9 @@ struct queue_limits { unsigned int discard_alignment; unsigned int zone_write_granularity; + unsigned int max_copy_hw_sectors; + unsigned int max_copy_sectors; + unsigned short max_segments; unsigned short max_integrity_segments; unsigned short max_discard_segments; @@ -893,6 +896,8 @@ extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); extern void blk_queue_max_segments(struct request_queue *, unsigned short); extern void blk_queue_max_discard_segments(struct request_queue *, unsigned short); +extern void blk_queue_max_copy_hw_sectors(struct request_queue *q, + unsigned int max_copy_sectors); void blk_queue_max_secure_erase_sectors(struct request_queue *q, unsigned int max_sectors); extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); @@ -1211,6 +1216,14 @@ static inline unsigned int bdev_discard_granularity(struct block_device *bdev) return bdev_get_queue(bdev)->limits.discard_granularity; } +/* maximum copy offload length, this is set to 128MB based on current testing */ +#define BLK_COPY_MAX_BYTES (1 << 27) + +static inline unsigned int bdev_max_copy_sectors(struct block_device *bdev) +{ + return bdev_get_queue(bdev)->limits.max_copy_sectors; +} + static inline unsigned int bdev_max_secure_erase_sectors(struct block_device *bdev) {