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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 1/8] block: Introduce queue limits for copy-offload support X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Add device limits as sysfs entries, - copy_offload (RW) - copy_max_bytes (RW) - copy_max_bytes_hw (RO) Above limits help to split the copy payload in block layer. copy_offload: used for setting copy offload(1) or emulation(0). copy_max_bytes: maximum total length of copy in single payload. copy_max_bytes_hw: 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 --- Documentation/ABI/stable/sysfs-block | 36 ++++++++++++++++ block/blk-settings.c | 24 +++++++++++ block/blk-sysfs.c | 64 ++++++++++++++++++++++++++++ include/linux/blkdev.h | 12 ++++++ include/uapi/linux/fs.h | 3 ++ 5 files changed, 139 insertions(+) diff --git a/Documentation/ABI/stable/sysfs-block b/Documentation/ABI/stable/sysfs-block index cd14ecb3c9a5..e0c9be009706 100644 --- a/Documentation/ABI/stable/sysfs-block +++ b/Documentation/ABI/stable/sysfs-block @@ -155,6 +155,42 @@ Description: last zone of the device which may be smaller. +What: /sys/block//queue/copy_offload +Date: November 2022 +Contact: linux-block@vger.kernel.org +Description: + [RW] When read, this file shows whether offloading copy to + device is enabled (1) or disabled (0). Writing '0' to this + file will disable offloading copies for this device. + Writing any '1' value will enable this feature. If device + does not support offloading, then writing 1, will result in + error. + + +What: /sys/block//queue/copy_max_bytes +Date: November 2022 +Contact: linux-block@vger.kernel.org +Description: + [RW] While 'copy_max_bytes_hw' is the hardware limit for the + device, 'copy_max_bytes' setting is the software limit. + Setting this value lower will make Linux issue smaller size + copies from block layer. + + +What: /sys/block//queue/copy_max_bytes_hw +Date: November 2022 +Contact: linux-block@vger.kernel.org +Description: + [RO] Devices that support offloading copy functionality may have + internal limits on the number of bytes that can be offloaded + in a single operation. The `copy_max_bytes_hw` + parameter is set by the device driver to the maximum number of + bytes that can be copied in a single operation. Copy + requests issued to the device must not exceed this limit. + 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 0477c4d527fe..ca6f15a70fdc 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -58,6 +58,8 @@ 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_sectors_hw = 0; + lim->max_copy_sectors = 0; } /** @@ -81,6 +83,8 @@ 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_sectors_hw = ULONG_MAX; + lim->max_copy_sectors = ULONG_MAX; } EXPORT_SYMBOL(blk_set_stacking_limits); @@ -177,6 +181,22 @@ void blk_queue_max_discard_sectors(struct request_queue *q, } EXPORT_SYMBOL(blk_queue_max_discard_sectors); +/** + * blk_queue_max_copy_sectors_hw - 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_sectors_hw(struct request_queue *q, + unsigned int max_copy_sectors) +{ + if (max_copy_sectors >= MAX_COPY_TOTAL_LENGTH) + max_copy_sectors = MAX_COPY_TOTAL_LENGTH; + + q->limits.max_copy_sectors_hw = max_copy_sectors; + q->limits.max_copy_sectors = max_copy_sectors; +} +EXPORT_SYMBOL_GPL(blk_queue_max_copy_sectors_hw); + /** * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase * @q: the request queue for the device @@ -572,6 +592,10 @@ 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_sectors_hw = min(t->max_copy_sectors_hw, + b->max_copy_sectors_hw); + t->misaligned |= b->misaligned; alignment = queue_limit_alignment_offset(b, start); diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 93d9e9c9a6ea..82a28a6c2e8a 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -212,6 +212,63 @@ 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_offload_show(struct request_queue *q, char *page) +{ + return queue_var_show(blk_queue_copy(q), page); +} + +static ssize_t queue_copy_offload_store(struct request_queue *q, + const char *page, size_t count) +{ + s64 copy_offload; + ssize_t ret = queue_var_store64(©_offload, page); + + if (ret < 0) + return ret; + + if (copy_offload && !q->limits.max_copy_sectors_hw) + return -EINVAL; + + if (copy_offload) + blk_queue_flag_set(QUEUE_FLAG_COPY, q); + else + blk_queue_flag_clear(QUEUE_FLAG_COPY, q); + + return count; +} + +static ssize_t queue_copy_max_hw_show(struct request_queue *q, char *page) +{ + return sprintf(page, "%llu\n", (unsigned long long) + q->limits.max_copy_sectors_hw << 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) +{ + s64 max_copy; + ssize_t ret = queue_var_store64(&max_copy, page); + + if (ret < 0) + return ret; + + if (max_copy & (queue_logical_block_size(q) - 1)) + return -EINVAL; + + max_copy >>= SECTOR_SHIFT; + if (max_copy > q->limits.max_copy_sectors_hw) + max_copy = q->limits.max_copy_sectors_hw; + + q->limits.max_copy_sectors = max_copy; + return count; +} + static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) { return queue_var_show(0, page); @@ -604,6 +661,10 @@ 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_RW_ENTRY(queue_copy_offload, "copy_offload"); +QUEUE_RO_ENTRY(queue_copy_max_hw, "copy_max_bytes_hw"); +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"); @@ -651,6 +712,9 @@ static struct attribute *queue_attrs[] = { &queue_discard_max_entry.attr, &queue_discard_max_hw_entry.attr, &queue_discard_zeroes_data_entry.attr, + &queue_copy_offload_entry.attr, + &queue_copy_max_hw_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 43d4e073b111..807ffb5f715d 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -303,6 +303,9 @@ struct queue_limits { unsigned int discard_alignment; unsigned int zone_write_granularity; + unsigned long max_copy_sectors_hw; + unsigned long max_copy_sectors; + unsigned short max_segments; unsigned short max_integrity_segments; unsigned short max_discard_segments; @@ -571,6 +574,7 @@ struct request_queue { #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */ #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/ +#define QUEUE_FLAG_COPY 32 /* supports copy offload */ #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \ (1UL << QUEUE_FLAG_SAME_COMP) | \ @@ -591,6 +595,7 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) +#define blk_queue_copy(q) test_bit(QUEUE_FLAG_COPY, &(q)->queue_flags) #define blk_queue_zone_resetall(q) \ test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) @@ -911,6 +916,8 @@ 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_sectors_hw(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); @@ -1229,6 +1236,11 @@ static inline unsigned int bdev_discard_granularity(struct block_device *bdev) return bdev_get_queue(bdev)->limits.discard_granularity; } +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) { diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index b7b56871029c..b3ad173f619c 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -64,6 +64,9 @@ struct fstrim_range { __u64 minlen; }; +/* maximum total copy length */ +#define MAX_COPY_TOTAL_LENGTH (1 << 27) + /* extent-same (dedupe) ioctls; these MUST match the btrfs ioctl definitions */ #define FILE_DEDUPE_RANGE_SAME 0 #define FILE_DEDUPE_RANGE_DIFFERS 1 From patchwork Mon Feb 20 10:53:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nitesh Shetty X-Patchwork-Id: 13147451 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EF217C6379F for ; Tue, 21 Feb 2023 07:40:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1676965229; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; 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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 2/8] block: Add copy offload support infrastructure X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Introduce blkdev_issue_copy which takes similar arguments as copy_file_range and performs copy offload between two bdevs. Introduce REQ_COPY copy offload operation flag. Create a read-write bio pair with a token as payload and submitted to the device in order. Read request populates token with source specific information which is then passed with write request. This design is courtesy Mikulas Patocka's token based copy Larger copy will be divided, based on max_copy_sectors limit. Signed-off-by: Nitesh Shetty Signed-off-by: Anuj Gupta --- block/blk-lib.c | 235 ++++++++++++++++++++++++++++++++++++++ block/blk.h | 2 + include/linux/blk_types.h | 25 ++++ include/linux/blkdev.h | 3 + 4 files changed, 265 insertions(+) diff --git a/block/blk-lib.c b/block/blk-lib.c index e59c3069e835..c48cee5b6c98 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -115,6 +115,241 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t sector, } EXPORT_SYMBOL(blkdev_issue_discard); +/* + * For synchronous copy offload/emulation, wait and process all in-flight BIOs. + * This must only be called once all bios have been issued so that the refcount + * can only decrease. This just waits for all bios to make it through + * bio_copy_*_write_end_io. IO errors are propagated through cio->io_error. + */ +static int cio_await_completion(struct cio *cio) +{ + int ret = 0; + + if (cio->endio) + return 0; + + if (atomic_read(&cio->refcount)) { + __set_current_state(TASK_UNINTERRUPTIBLE); + blk_io_schedule(); + } + + ret = cio->comp_len; + kfree(cio); + + return ret; +} + +static void blk_copy_offload_write_end_io(struct bio *bio) +{ + struct copy_ctx *ctx = bio->bi_private; + struct cio *cio = ctx->cio; + sector_t clen; + + if (bio->bi_status) { + clen = (bio->bi_iter.bi_sector << SECTOR_SHIFT) - cio->pos_out; + cio->comp_len = min_t(sector_t, clen, cio->comp_len); + } + __free_page(bio->bi_io_vec[0].bv_page); + bio_put(bio); + + kfree(ctx); + if (atomic_dec_and_test(&cio->refcount)) { + if (cio->endio) { + cio->endio(cio->private, cio->comp_len); + kfree(cio); + } else + blk_wake_io_task(cio->waiter); + } +} + +static void blk_copy_offload_read_end_io(struct bio *read_bio) +{ + struct copy_ctx *ctx = read_bio->bi_private; + struct cio *cio = ctx->cio; + sector_t clen; + + if (read_bio->bi_status) { + clen = (read_bio->bi_iter.bi_sector << SECTOR_SHIFT) + - cio->pos_in; + cio->comp_len = min_t(sector_t, clen, cio->comp_len); + __free_page(read_bio->bi_io_vec[0].bv_page); + bio_put(ctx->write_bio); + bio_put(read_bio); + kfree(ctx); + if (atomic_dec_and_test(&cio->refcount)) { + if (cio->endio) { + cio->endio(cio->private, cio->comp_len); + kfree(cio); + } else + blk_wake_io_task(cio->waiter); + } + return; + } + + schedule_work(&ctx->dispatch_work); + bio_put(read_bio); +} + +static void blk_copy_dispatch_work_fn(struct work_struct *work) +{ + struct copy_ctx *ctx = container_of(work, struct copy_ctx, + dispatch_work); + + submit_bio(ctx->write_bio); +} + +/* + * __blk_copy_offload - Use device's native copy offload feature. + * we perform copy operation by sending 2 bio. + * 1. First we send a read bio with REQ_COPY flag along with a token and source + * and length. Once read bio reaches driver layer, device driver adds all the + * source info to token and does a fake completion. + * 2. Once read opration completes, we issue write with REQ_COPY flag with same + * token. In driver layer, token info is used to form a copy offload command. + * + * returns the length of bytes copied or negative error value + */ +static int __blk_copy_offload(struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, size_t len, + cio_iodone_t end_io, void *private, gfp_t gfp_mask) +{ + struct cio *cio; + struct copy_ctx *ctx; + struct bio *read_bio, *write_bio; + struct page *token; + sector_t copy_len; + sector_t rem, max_copy_len; + + cio = kzalloc(sizeof(struct cio), GFP_KERNEL); + if (!cio) + return -ENOMEM; + atomic_set(&cio->refcount, 0); + cio->waiter = current; + cio->endio = end_io; + cio->private = private; + + max_copy_len = min(bdev_max_copy_sectors(bdev_in), + bdev_max_copy_sectors(bdev_out)) << SECTOR_SHIFT; + + cio->pos_in = pos_in; + cio->pos_out = pos_out; + cio->comp_len = len; + for (rem = len; rem > 0; rem -= copy_len) { + copy_len = min(rem, max_copy_len); + + token = alloc_page(gfp_mask); + if (unlikely(!token)) + goto err_token; + + ctx = kzalloc(sizeof(struct copy_ctx), gfp_mask); + if (!ctx) + goto err_ctx; + read_bio = bio_alloc(bdev_in, 1, REQ_OP_READ | REQ_COPY + | REQ_SYNC | REQ_NOMERGE, gfp_mask); + if (!read_bio) + goto err_read_bio; + write_bio = bio_alloc(bdev_out, 1, REQ_OP_WRITE + | REQ_COPY | REQ_SYNC | REQ_NOMERGE, gfp_mask); + if (!write_bio) + goto err_write_bio; + + ctx->cio = cio; + ctx->write_bio = write_bio; + INIT_WORK(&ctx->dispatch_work, blk_copy_dispatch_work_fn); + + __bio_add_page(read_bio, token, PAGE_SIZE, 0); + read_bio->bi_iter.bi_size = copy_len; + read_bio->bi_iter.bi_sector = pos_in >> SECTOR_SHIFT; + read_bio->bi_end_io = blk_copy_offload_read_end_io; + read_bio->bi_private = ctx; + + __bio_add_page(write_bio, token, PAGE_SIZE, 0); + write_bio->bi_iter.bi_size = copy_len; + write_bio->bi_end_io = blk_copy_offload_write_end_io; + write_bio->bi_iter.bi_sector = pos_out >> SECTOR_SHIFT; + write_bio->bi_private = ctx; + + atomic_inc(&cio->refcount); + submit_bio(read_bio); + pos_in += copy_len; + pos_out += copy_len; + } + + /* Wait for completion of all IO's*/ + return cio_await_completion(cio); + +err_write_bio: + bio_put(read_bio); +err_read_bio: + kfree(ctx); +err_ctx: + __free_page(token); +err_token: + cio->comp_len = min_t(sector_t, cio->comp_len, (len - rem)); + return cio_await_completion(cio); +} + +static inline int blk_copy_sanity_check(struct block_device *bdev_in, + loff_t pos_in, struct block_device *bdev_out, loff_t pos_out, + size_t len) +{ + unsigned int align = max(bdev_logical_block_size(bdev_out), + bdev_logical_block_size(bdev_in)) - 1; + + if (bdev_read_only(bdev_out)) + return -EPERM; + + if ((pos_in & align) || (pos_out & align) || (len & align) || !len || + len >= MAX_COPY_TOTAL_LENGTH) + return -EINVAL; + + return 0; +} + +static inline bool blk_check_copy_offload(struct request_queue *q_in, + struct request_queue *q_out) +{ + return blk_queue_copy(q_in) && blk_queue_copy(q_out); +} + +/* + * @bdev_in: source block device + * @pos_in: source offset + * @bdev_out: destination block device + * @pos_out: destination offset + * @end_io: end_io function to be called on completion of copy operation, + * for synchronous operation this should be NULL + * @private: end_io function will be called with this private data, should be + * NULL, if operation is synchronous in nature + * @gfp_mask: memory allocation flags (for bio_alloc) + * + * Returns the length of bytes copied or a negative error value + * + * Description: + * Copy source offset from source block device to destination block + * device. length of a source range cannot be zero. Max total length of + * copy is limited to MAX_COPY_TOTAL_LENGTH + */ +int blkdev_issue_copy(struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, size_t len, + cio_iodone_t end_io, void *private, gfp_t gfp_mask) +{ + struct request_queue *q_in = bdev_get_queue(bdev_in); + struct request_queue *q_out = bdev_get_queue(bdev_out); + int ret = -EINVAL; + + ret = blk_copy_sanity_check(bdev_in, pos_in, bdev_out, pos_out, len); + if (ret) + return ret; + + if (blk_check_copy_offload(q_in, q_out)) + ret = __blk_copy_offload(bdev_in, pos_in, bdev_out, pos_out, + len, end_io, private, gfp_mask); + + return ret; +} +EXPORT_SYMBOL_GPL(blkdev_issue_copy); + static int __blkdev_issue_write_zeroes(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, unsigned flags) diff --git a/block/blk.h b/block/blk.h index 4c3b3325219a..6d9924a7d559 100644 --- a/block/blk.h +++ b/block/blk.h @@ -304,6 +304,8 @@ static inline bool bio_may_exceed_limits(struct bio *bio, break; } + if (unlikely(op_is_copy(bio->bi_opf))) + return false; /* * All drivers must accept single-segments bios that are <= PAGE_SIZE. * This is a quick and dirty check that relies on the fact that diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 99be590f952f..bab0ed9c767e 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -422,6 +422,7 @@ enum req_flag_bits { */ /* for REQ_OP_WRITE_ZEROES: */ __REQ_NOUNMAP, /* do not free blocks when zeroing */ + __REQ_COPY, /* copy request */ __REQ_NR_BITS, /* stops here */ }; @@ -451,6 +452,7 @@ enum req_flag_bits { #define REQ_DRV (__force blk_opf_t)(1ULL << __REQ_DRV) #define REQ_SWAP (__force blk_opf_t)(1ULL << __REQ_SWAP) +#define REQ_COPY ((__force blk_opf_t)(1ULL << __REQ_COPY)) #define REQ_FAILFAST_MASK \ (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) @@ -477,6 +479,11 @@ static inline bool op_is_write(blk_opf_t op) return !!(op & (__force blk_opf_t)1); } +static inline bool op_is_copy(blk_opf_t op) +{ + return (op & REQ_COPY); +} + /* * Check if the bio or request is one that needs special treatment in the * flush state machine. @@ -536,4 +543,22 @@ struct blk_rq_stat { u64 batch; }; +typedef void (cio_iodone_t)(void *private, int comp_len); + +struct cio { + struct task_struct *waiter; /* waiting task (NULL if none) */ + atomic_t refcount; + loff_t pos_in; + loff_t pos_out; + size_t comp_len; + cio_iodone_t *endio; /* applicable for async operation */ + void *private; /* applicable for async operation */ +}; + +struct copy_ctx { + struct cio *cio; + struct work_struct dispatch_work; + struct bio *write_bio; +}; + #endif /* __LINUX_BLK_TYPES_H */ diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 807ffb5f715d..18d5bd7fc3bf 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1063,6 +1063,9 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop); int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp); 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Mon, 20 Feb 2023 10:54:46 +0000 (GMT) From: Nitesh Shetty To: Jens Axboe , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Keith Busch , Christoph Hellwig , Sagi Grimberg , James Smart , Chaitanya Kulkarni , Alexander Viro Date: Mon, 20 Feb 2023 16:23:26 +0530 Message-Id: <20230220105336.3810-4-nj.shetty@samsung.com> In-Reply-To: <20230220105336.3810-1-nj.shetty@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02Te0xTVxzHd+4tt8XY7QounOKGWCAMkEddYaeMTrK55RpxIVFZMnHYlDtA Slv7EGFj4x3AYFWGY2UqTOMQGEhFUh51pgx5WXAwmBB5GOr+EHm4LrSG11oLm/99zu/3/T1P fizcTcP0ZKVIVbRCKpJwiS2Mls6Ad4I5Eos4bLHECzX23cNR7rlVHNVNaAh0cfEFjpZNgzgy zFe6oLG7rRjq+OkChm7UdWGovfo5hrrW5wh0wTgK0JMRLYYM40Gow9DLQMNtPxLoyvUnTGQs y8OQ3pwDUMvyFRw1zC4wUM/4DjRzpgigwdVul2hIDf9xgNJOmQiqVTvBpAYnmxjUsElN6WqL CerWtW+p9rFsgirNm7cLCqZcqIU7IwR1trkWULf6v6IsOi9KZ57DYt/4PDUqmRYl0gpvWiqW JaZIk4TcA4cSPkoIjwjjBfME6D2ut1SURgu5+2Jigz9Jkdj3wPU+JZKo7aZYkVLJDf0gSiFT q2jvZJlSJeTS8kSJnC8PUYrSlGppUoiUVkXywsL2hNuFx1OTr96xAXll9Onxgd+Z2WCSXwJc WZDkw9LnhaAEbGG5ke0Ajl9t2Xj8DeDqowqGQ+VGWgDsuOm+GZFn07k4RW0AmmfMhFOUh8Hf zgpLAItFkEGwf53lMG8nH2Gwtd/HocfJAhya7+qZDoc7GQ6bp6cxBzNIPzhVuoI7mE0KYMfl asKRB5KhUDO1zYGuZCS05mc4Fdtg7w/ml63h5E6Yd7sSd6SHZJ0rrNWsYM4+98FK25iLk93h 0+5mppM9oWXeQDg5Hd74roZwBucDqP1TC5yOvbCgT4M7CuNkAGxsC3Wa34blfQ2Ys/DrsHTZ vFGLDfWXN9kH1jdWbeTnwFFrzgZTsKrmMebcWymAZ1ZWiXPAW/vKQNpXBtL+X7oK4LWAQ8uV aUm0MlzOk9Lp//2xWJamAy8vI3C/HkxML4YYAcYCRgBZOHc7e51tEbuxE0UZmbRClqBQS2il EYTb930e93xTLLOfllSVwOMLwvgRERF8wbsRPK4H21/YK3Yjk0QqOpWm5bRiMw5juXpmYzuS juqWV4oW2M1HX0yufvN184mhpNGeU9wVo99I/kOfiRNfBFZvjd6T3XkpzuNw12vMnV9GH7bO zsbP9AX4Hi9p9F8rfgY7XHJjcgYMHxd+Sp0OFvjXTC7u50Te51y0Hnz/w+vl+gJrrmDX3geG X7aqB+hfv9+V2Wn9zOTb31SWZasOiT8SJ8EOvVVxPlQihClrP1cIKk8uPWy7X996qbPM1RSV mSyJY+lQY2H8Xxkx0xlLN/WMxzbYz7EN9Mw8a+wbqszySDcOux07GNLzj7q2yGI7hsGmxCGj +N6aRzs9frtcc8Trqe/uoGvFD/wW8yXd9Q1NS1NZJlGaOmP3fM7JOS5DmSziBeIKpehffcLW eaIEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA02RaUwTYRCG/XaX7dKkuq01foCIqVekWkRBP4kSYjw23hgxohiosAEjLU0L Kp4g4lFEEFFDMSJiiEAQKUe4Y4oVC6moIIRGaJXDAwQFUUBrtaKJ/56Z95mZH0PhggbCmToo j2aVcmmkiOQS5fUityUn/UdClxbWi1FR42McnUm14qigM4VE1z+N4+i7sRlHtYOZDqjjYSWG au6kYSivQI+h6uzPGNLbPpIoTdcGUO9LDYZqTWJUU2sgUEvVTRJl5fZykO5qAoYqeuIBKv+e haP7/UMEemJyQd1JFwBqtjY4+EGmpXUzozEbSaZS08lhmruKCabFGMNo8y+STMnd00x1RxzJ JCcM/hYSzQ7MUN1Lkrlcmg+YkqbjzIh2NqPt+YjtmLaXuzqMjTx4mFV6+IZwI3LqxoAi0++o 6elzThzo8lIDRwrSXjBhTOugBlxKQFcA+LbxBz4ZOMFc66O/PB3m/XzLmZTiMdh3pRioAUWR tBg22Sh7X0j3YdDY9Qa3Fzh9DYej1QOkfXo67Q1LLRbMzgQ9H5qTJy/w6FWw5lY2aV8EaQ+Y Yubb0ZH2gd/OxtoNwW/jSVoJmLT50JDRQ9gZp91gQlkmngpozX+R5r/oNsDygROrUMnCZSpP xTI5e0SikspUMfJwSWiUTAv+/NrdvQLU5H+S6ABGAR2AFC4S8my8kVABL0wae4xVRgUrYyJZ lQ64UIRoJu+Z2hAsoMOl0ewhllWwyn8pRjk6x2Fl2168Cmm9kRHIHQh1qdcHXlqfDhtLC1wn OIXDQn23q5qJtbYbbW1fjJbcxxvVFS2+yYOzy7ZzDXND5p1d2yV8lxodsGKgSB2/29srOKjO sO/UsC12zcqGXQ+iBopGukHY+mdTh/hJ8d79bVNMfnvavxa2jnZmVYUsbvqAnctwk3hO3I44 X1zfPTxjYf/4urlJ7118s8ab2EUHuBxxIG+TJD1gYolKk15ZbXWqIiaO2so150dXDxUZLQtk ozf4s/wDfE5vWbSQUIgP/ThxoOPppnvtW+cs3YDJ97fvXCN6HZT4Yti15K4h0yI2Lef7SDzL TIl6oUdfbs5Y9jKzV2N4kohQRUg93XGlSvoL8FFAo1oDAAA= X-CMS-MailID: 20230220105453epcas5p32b30be5c5b4b21fe0bd4500a560b2b9b X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230220105453epcas5p32b30be5c5b4b21fe0bd4500a560b2b9b References: <20230220105336.3810-1-nj.shetty@samsung.com> X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 3/8] block: add emulation for copy X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vincent Fu , bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com For the devices which does not support copy, copy emulation is added. It is required for in-kernel users like fabrics, where file descriptor is not available and hence they can't use copy_file_range. Copy-emulation is implemented by reading from source into memory and writing to the corresponding destination asynchronously. Also emulation is used, if copy offload fails or partially completes. Signed-off-by: Nitesh Shetty Signed-off-by: Vincent Fu Signed-off-by: Anuj Gupta --- block/blk-lib.c | 171 ++++++++++++++++++++++++++++++++++++++++- block/blk-map.c | 4 +- include/linux/blkdev.h | 3 + 3 files changed, 175 insertions(+), 3 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index c48cee5b6c98..74f58faf82d8 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -289,6 +289,169 @@ static int __blk_copy_offload(struct block_device *bdev_in, loff_t pos_in, return cio_await_completion(cio); } +static void *blk_alloc_buf(sector_t req_size, sector_t *alloc_size, + gfp_t gfp_mask) +{ + int min_size = PAGE_SIZE; + void *buf; + + while (req_size >= min_size) { + buf = kvmalloc(req_size, gfp_mask); + if (buf) { + *alloc_size = req_size; + return buf; + } + /* retry half the requested size */ + req_size >>= 1; + } + + return NULL; +} + +static void blk_copy_emulate_write_end_io(struct bio *bio) +{ + struct copy_ctx *ctx = bio->bi_private; + struct cio *cio = ctx->cio; + sector_t clen; + + if (bio->bi_status) { + clen = (bio->bi_iter.bi_sector << SECTOR_SHIFT) - cio->pos_out; + cio->comp_len = min_t(sector_t, clen, cio->comp_len); + } + kvfree(page_address(bio->bi_io_vec[0].bv_page)); + bio_map_kern_endio(bio); + kfree(ctx); + if (atomic_dec_and_test(&cio->refcount)) { + if (cio->endio) { + cio->endio(cio->private, cio->comp_len); + kfree(cio); + } else + blk_wake_io_task(cio->waiter); + } +} + +static void blk_copy_emulate_read_end_io(struct bio *read_bio) +{ + struct copy_ctx *ctx = read_bio->bi_private; + struct cio *cio = ctx->cio; + sector_t clen; + + if (read_bio->bi_status) { + clen = (read_bio->bi_iter.bi_sector << SECTOR_SHIFT) - + cio->pos_in; + cio->comp_len = min_t(sector_t, clen, cio->comp_len); + __free_page(read_bio->bi_io_vec[0].bv_page); + bio_map_kern_endio(read_bio); + kfree(ctx); + + if (atomic_dec_and_test(&cio->refcount)) { + if (cio->endio) { + cio->endio(cio->private, cio->comp_len); + kfree(cio); + } else + blk_wake_io_task(cio->waiter); + } + } + schedule_work(&ctx->dispatch_work); + kfree(read_bio); +} + +/* + * If native copy offload feature is absent, this function tries to emulate, + * by copying data from source to a temporary buffer and from buffer to + * destination device. + * returns the length of bytes copied or negative error value + */ +static int __blk_copy_emulate(struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, size_t len, + cio_iodone_t end_io, void *private, gfp_t gfp_mask) +{ + struct request_queue *in = bdev_get_queue(bdev_in); + struct request_queue *out = bdev_get_queue(bdev_out); + struct bio *read_bio, *write_bio; + void *buf = NULL; + struct copy_ctx *ctx; + struct cio *cio; + sector_t buf_len, req_len, rem = 0; + sector_t max_src_hw_len = min_t(unsigned int, + queue_max_hw_sectors(in), + queue_max_segments(in) << (PAGE_SHIFT - SECTOR_SHIFT)) + << SECTOR_SHIFT; + sector_t max_dst_hw_len = min_t(unsigned int, + queue_max_hw_sectors(out), + queue_max_segments(out) << (PAGE_SHIFT - SECTOR_SHIFT)) + << SECTOR_SHIFT; + sector_t max_hw_len = min_t(unsigned int, + max_src_hw_len, max_dst_hw_len); + + cio = kzalloc(sizeof(struct cio), GFP_KERNEL); + if (!cio) + return -ENOMEM; + atomic_set(&cio->refcount, 0); + cio->pos_in = pos_in; + cio->pos_out = pos_out; + cio->waiter = current; + cio->endio = end_io; + cio->private = private; + + for (rem = len; rem > 0; rem -= buf_len) { + req_len = min_t(int, max_hw_len, rem); + + buf = blk_alloc_buf(req_len, &buf_len, gfp_mask); + if (!buf) + goto err_alloc_buf; + + ctx = kzalloc(sizeof(struct copy_ctx), gfp_mask); + if (!ctx) + goto err_ctx; + + read_bio = bio_map_kern(in, buf, buf_len, gfp_mask); + if (IS_ERR(read_bio)) + goto err_read_bio; + + write_bio = bio_map_kern(out, buf, buf_len, gfp_mask); + if (IS_ERR(write_bio)) + goto err_write_bio; + + ctx->cio = cio; + ctx->write_bio = write_bio; + INIT_WORK(&ctx->dispatch_work, blk_copy_dispatch_work_fn); + + read_bio->bi_iter.bi_sector = pos_in >> SECTOR_SHIFT; + read_bio->bi_iter.bi_size = buf_len; + read_bio->bi_opf = REQ_OP_READ | REQ_SYNC; + bio_set_dev(read_bio, bdev_in); + read_bio->bi_end_io = blk_copy_emulate_read_end_io; + read_bio->bi_private = ctx; + + write_bio->bi_iter.bi_size = buf_len; + write_bio->bi_opf = REQ_OP_WRITE | REQ_SYNC; + bio_set_dev(write_bio, bdev_out); + write_bio->bi_end_io = blk_copy_emulate_write_end_io; + write_bio->bi_iter.bi_sector = pos_out >> SECTOR_SHIFT; + write_bio->bi_private = ctx; + + atomic_inc(&cio->refcount); + submit_bio(read_bio); + + pos_in += buf_len; + pos_out += buf_len; + } + + /* Wait for completion of all IO's*/ + return cio_await_completion(cio); + +err_write_bio: + bio_put(read_bio); +err_read_bio: + kfree(ctx); +err_ctx: + kvfree(buf); +err_alloc_buf: + cio->comp_len -= min_t(sector_t, cio->comp_len, len - rem); + return cio_await_completion(cio); +} + static inline int blk_copy_sanity_check(struct block_device *bdev_in, loff_t pos_in, struct block_device *bdev_out, loff_t pos_out, size_t len) @@ -337,15 +500,21 @@ int blkdev_issue_copy(struct block_device *bdev_in, loff_t pos_in, struct request_queue *q_in = bdev_get_queue(bdev_in); struct request_queue *q_out = bdev_get_queue(bdev_out); int ret = -EINVAL; + bool offload = false; ret = blk_copy_sanity_check(bdev_in, pos_in, bdev_out, pos_out, len); if (ret) return ret; - if (blk_check_copy_offload(q_in, q_out)) + offload = blk_check_copy_offload(q_in, q_out); + if (offload) ret = __blk_copy_offload(bdev_in, pos_in, bdev_out, pos_out, len, end_io, private, gfp_mask); + if ((ret != len) || !offload) + ret = __blk_copy_emulate(bdev_in, pos_in + ret, bdev_out, + pos_out + ret, len - ret, end_io, private, gfp_mask); + return ret; } EXPORT_SYMBOL_GPL(blkdev_issue_copy); diff --git a/block/blk-map.c b/block/blk-map.c index 19940c978c73..bcf8db2b75f1 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -363,7 +363,7 @@ static void bio_invalidate_vmalloc_pages(struct bio *bio) #endif } -static void bio_map_kern_endio(struct bio *bio) +void bio_map_kern_endio(struct bio *bio) { bio_invalidate_vmalloc_pages(bio); bio_uninit(bio); @@ -380,7 +380,7 @@ static void bio_map_kern_endio(struct bio *bio) * Map the kernel address into a bio suitable for io to a block * device. Returns an error pointer in case of error. */ -static struct bio *bio_map_kern(struct request_queue *q, void *data, +struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, gfp_t gfp_mask) { unsigned long kaddr = (unsigned long)data; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 18d5bd7fc3bf..766761911190 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1066,6 +1066,9 @@ int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, int blkdev_issue_copy(struct block_device *bdev_in, loff_t pos_in, struct block_device *bdev_out, loff_t pos_out, size_t len, cio_iodone_t end_io, void *private, gfp_t gfp_mask); +struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, + gfp_t gfp_mask); +void bio_map_kern_endio(struct bio *bio); #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ From patchwork Mon Feb 20 10:53:27 2023 Content-Type: text/plain; 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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 4/8] fs, block: copy_file_range for def_blk_ops for direct block device. X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com For direct block device, use copy_file_range to issue device copy offload, and fallback to generic_copy_file_range incase device copy offload capability is absent. Modify checks to allow bdevs to use copy_file_range. Suggested-by: Ming Lei Signed-off-by: Anuj Gupta Signed-off-by: Nitesh Shetty --- block/blk-lib.c | 22 ++++++++++++++++++++++ block/fops.c | 18 ++++++++++++++++++ fs/read_write.c | 11 +++++++++-- include/linux/blkdev.h | 3 +++ 4 files changed, 52 insertions(+), 2 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index 74f58faf82d8..6593de525a26 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -475,6 +475,28 @@ static inline bool blk_check_copy_offload(struct request_queue *q_in, return blk_queue_copy(q_in) && blk_queue_copy(q_out); } +int blkdev_copy_offload(struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, size_t len, + cio_iodone_t end_io, void *private, gfp_t gfp_mask) +{ + struct request_queue *in_q = bdev_get_queue(bdev_in); + struct request_queue *out_q = bdev_get_queue(bdev_out); + int ret = -EINVAL; + bool offload = false; + + ret = blk_copy_sanity_check(bdev_in, pos_in, bdev_out, pos_out, len); + if (ret) + return ret; + + offload = blk_check_copy_offload(in_q, out_q); + if (offload) + ret = __blk_copy_offload(bdev_in, pos_in, bdev_out, pos_out, + len, end_io, private, gfp_mask); + + return ret; +} +EXPORT_SYMBOL_GPL(blkdev_copy_offload); + /* * @bdev_in: source block device * @pos_in: source offset diff --git a/block/fops.c b/block/fops.c index 50d245e8c913..bcb9ee6565ea 100644 --- a/block/fops.c +++ b/block/fops.c @@ -596,6 +596,23 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) return ret; } +ssize_t blkdev_copy_file_range(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + size_t len, unsigned int flags) +{ + struct block_device *in_bdev = I_BDEV(bdev_file_inode(file_in)); + struct block_device *out_bdev = I_BDEV(bdev_file_inode(file_out)); + int comp_len; + + comp_len = blkdev_copy_offload(in_bdev, pos_in, out_bdev, pos_out, len, + NULL, NULL, GFP_KERNEL); + if (comp_len != len) + comp_len = generic_copy_file_range(file_in, pos_in + comp_len, + file_out, pos_out + comp_len, len - comp_len, flags); + + return comp_len; +} + #define BLKDEV_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE) @@ -679,6 +696,7 @@ const struct file_operations def_blk_fops = { .splice_read = generic_file_splice_read, .splice_write = iter_file_splice_write, .fallocate = blkdev_fallocate, + .copy_file_range = blkdev_copy_file_range, }; static __init int blkdev_init(void) diff --git a/fs/read_write.c b/fs/read_write.c index 7a2ff6157eda..62e925e9b2f0 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "internal.h" #include @@ -1448,7 +1449,11 @@ static int generic_copy_file_checks(struct file *file_in, loff_t pos_in, return -EOVERFLOW; /* Shorten the copy to EOF */ - size_in = i_size_read(inode_in); + if (S_ISBLK(inode_in->i_mode)) + size_in = bdev_nr_bytes(I_BDEV(file_in->f_mapping->host)); + else + size_in = i_size_read(inode_in); + if (pos_in >= size_in) count = 0; else @@ -1709,7 +1714,9 @@ int generic_file_rw_checks(struct file *file_in, struct file *file_out) /* Don't copy dirs, pipes, sockets... */ if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) return -EISDIR; - if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) + + if ((!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) && + (!S_ISBLK(inode_in->i_mode) || !S_ISBLK(inode_out->i_mode))) return -EINVAL; if (!(file_in->f_mode & FMODE_READ) || diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 766761911190..ca7828b25d90 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1066,6 +1066,9 @@ int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, int blkdev_issue_copy(struct block_device *bdev_in, loff_t pos_in, struct block_device *bdev_out, loff_t pos_out, size_t len, cio_iodone_t end_io, void *private, gfp_t gfp_mask); +int blkdev_copy_offload(struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, size_t len, + cio_iodone_t end_io, void *private, gfp_t gfp_mask); struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, gfp_t gfp_mask); void bio_map_kern_endio(struct bio *bio); 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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 5/8] nvme: add copy offload support X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, =?utf-8?q?Javier_Gonz=C3=A1lez?= , damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com For device supporting native copy, nvme driver receives read and write request with BLK_COPY op flags. For read request the nvme driver populates the payload with source information. For write request the driver converts it to nvme copy command using the source information in the payload and submits to the device. current design only supports single source range. This design is courtesy Mikulas Patocka's token based copy trace event support for nvme_copy_cmd. Set the device copy limits to queue limits. Signed-off-by: Kanchan Joshi Signed-off-by: Nitesh Shetty Signed-off-by: Javier González Signed-off-by: Anuj Gupta --- drivers/nvme/host/constants.c | 1 + drivers/nvme/host/core.c | 106 +++++++++++++++++++++++++++++++++- drivers/nvme/host/fc.c | 5 ++ drivers/nvme/host/nvme.h | 7 +++ drivers/nvme/host/pci.c | 27 ++++++++- drivers/nvme/host/rdma.c | 7 +++ drivers/nvme/host/tcp.c | 16 +++++ drivers/nvme/host/trace.c | 19 ++++++ include/linux/nvme.h | 43 +++++++++++++- 9 files changed, 223 insertions(+), 8 deletions(-) diff --git a/drivers/nvme/host/constants.c b/drivers/nvme/host/constants.c index e958d5015585..4e60946d3aa8 100644 --- a/drivers/nvme/host/constants.c +++ b/drivers/nvme/host/constants.c @@ -19,6 +19,7 @@ static const char * const nvme_ops[] = { [nvme_cmd_resv_report] = "Reservation Report", [nvme_cmd_resv_acquire] = "Reservation Acquire", [nvme_cmd_resv_release] = "Reservation Release", + [nvme_cmd_copy] = "Copy Offload", [nvme_cmd_zone_mgmt_send] = "Zone Management Send", [nvme_cmd_zone_mgmt_recv] = "Zone Management Receive", [nvme_cmd_zone_append] = "Zone Management Append", diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 8b6421141162..4b1a1a3fad83 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -753,6 +753,80 @@ static inline void nvme_setup_flush(struct nvme_ns *ns, cmnd->common.nsid = cpu_to_le32(ns->head->ns_id); } +static inline blk_status_t nvme_setup_copy_read(struct nvme_ns *ns, + struct request *req) +{ + struct bio *bio = req->bio; + struct nvme_copy_token *token = bvec_kmap_local(&bio->bi_io_vec[0]); + + memcpy(token->subsys, "nvme", 4); + token->ns = ns; + token->src_sector = bio->bi_iter.bi_sector; + token->sectors = bio->bi_iter.bi_size >> 9; + + return BLK_STS_OK; +} + +static inline blk_status_t nvme_setup_copy_write(struct nvme_ns *ns, + struct request *req, struct nvme_command *cmnd) +{ + struct nvme_copy_range *range = NULL; + struct bio *bio = req->bio; + struct nvme_copy_token *token = bvec_kmap_local(&bio->bi_io_vec[0]); + sector_t src_sector, dst_sector, n_sectors; + u64 src_lba, dst_lba, n_lba; + unsigned short nr_range = 1; + u16 control = 0; + + if (unlikely(memcmp(token->subsys, "nvme", 4))) + return BLK_STS_NOTSUPP; + if (unlikely(token->ns != ns)) + return BLK_STS_NOTSUPP; + + src_sector = token->src_sector; + dst_sector = bio->bi_iter.bi_sector; + n_sectors = token->sectors; + if (WARN_ON(n_sectors != bio->bi_iter.bi_size >> 9)) + return BLK_STS_NOTSUPP; + + src_lba = nvme_sect_to_lba(ns, src_sector); + dst_lba = nvme_sect_to_lba(ns, dst_sector); + n_lba = nvme_sect_to_lba(ns, n_sectors); + + if (WARN_ON(!n_lba)) + return BLK_STS_NOTSUPP; + + if (req->cmd_flags & REQ_FUA) + control |= NVME_RW_FUA; + + if (req->cmd_flags & REQ_FAILFAST_DEV) + control |= NVME_RW_LR; + + memset(cmnd, 0, sizeof(*cmnd)); + cmnd->copy.opcode = nvme_cmd_copy; + cmnd->copy.nsid = cpu_to_le32(ns->head->ns_id); + cmnd->copy.sdlba = cpu_to_le64(dst_lba); + + range = kmalloc_array(nr_range, sizeof(*range), + GFP_ATOMIC | __GFP_NOWARN); + if (!range) + return BLK_STS_RESOURCE; + + range[0].slba = cpu_to_le64(src_lba); + range[0].nlb = cpu_to_le16(n_lba - 1); + + cmnd->copy.nr_range = 0; + + req->special_vec.bv_page = virt_to_page(range); + req->special_vec.bv_offset = offset_in_page(range); + req->special_vec.bv_len = sizeof(*range) * nr_range; + req->rq_flags |= RQF_SPECIAL_PAYLOAD; + + cmnd->copy.control = cpu_to_le16(control); + + return BLK_STS_OK; +} + static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req, struct nvme_command *cmnd) { @@ -979,10 +1053,16 @@ blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req) ret = nvme_setup_discard(ns, req, cmd); break; case REQ_OP_READ: - ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_read); + if (unlikely(req->cmd_flags & REQ_COPY)) + ret = nvme_setup_copy_read(ns, req); + else + ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_read); break; case REQ_OP_WRITE: - ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_write); + if (unlikely(req->cmd_flags & REQ_COPY)) + ret = nvme_setup_copy_write(ns, req, cmd); + else + ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_write); break; case REQ_OP_ZONE_APPEND: ret = nvme_setup_rw(ns, req, cmd, nvme_cmd_zone_append); @@ -1731,6 +1811,26 @@ static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns) blk_queue_max_write_zeroes_sectors(queue, UINT_MAX); } +static void nvme_config_copy(struct gendisk *disk, struct nvme_ns *ns, + struct nvme_id_ns *id) +{ + struct nvme_ctrl *ctrl = ns->ctrl; + struct request_queue *q = disk->queue; + + if (!(ctrl->oncs & NVME_CTRL_ONCS_COPY)) { + blk_queue_max_copy_sectors_hw(q, 0); + blk_queue_flag_clear(QUEUE_FLAG_COPY, q); + return; + } + + /* setting copy limits */ + if (blk_queue_flag_test_and_set(QUEUE_FLAG_COPY, q)) + return; + + blk_queue_max_copy_sectors_hw(q, + nvme_lba_to_sect(ns, le16_to_cpu(id->mssrl))); +} + static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b) { return uuid_equal(&a->uuid, &b->uuid) && @@ -1930,6 +2030,7 @@ static void nvme_update_disk_info(struct gendisk *disk, set_capacity_and_notify(disk, capacity); nvme_config_discard(disk, ns); + nvme_config_copy(disk, ns, id); blk_queue_max_write_zeroes_sectors(disk->queue, ns->ctrl->max_zeroes_sectors); } @@ -5323,6 +5424,7 @@ static inline void _nvme_check_size(void) BUILD_BUG_ON(sizeof(struct nvme_download_firmware) != 64); BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64); BUILD_BUG_ON(sizeof(struct nvme_dsm_cmd) != 64); + BUILD_BUG_ON(sizeof(struct nvme_copy_command) != 64); BUILD_BUG_ON(sizeof(struct nvme_write_zeroes_cmd) != 64); BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64); BUILD_BUG_ON(sizeof(struct nvme_get_log_page_command) != 64); diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index 456ee42a6133..0ec8f9cd0e09 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -2807,6 +2807,11 @@ nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx, if (ret) return ret; + if (unlikely((rq->cmd_flags & REQ_COPY) && + (req_op(rq) == REQ_OP_READ))) { + blk_mq_end_request(rq, BLK_STS_OK); + return BLK_STS_OK; + } /* * nvme core doesn't quite treat the rq opaquely. Commands such * as WRITE ZEROES will return a non-zero rq payload_bytes yet diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 424c8a467a0c..6e282956deb4 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -500,6 +500,13 @@ struct nvme_ns { }; +struct nvme_copy_token { + char subsys[4]; + struct nvme_ns *ns; + u64 src_sector; + u64 sectors; +}; + /* NVMe ns supports metadata actions by the controller (generate/strip) */ static inline bool nvme_ns_has_pi(struct nvme_ns *ns) { diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 6d88ddd35565..0b1dc5c457ad 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -499,16 +499,19 @@ static inline void nvme_sq_copy_cmd(struct nvme_queue *nvmeq, nvmeq->sq_tail = 0; } -static void nvme_commit_rqs(struct blk_mq_hw_ctx *hctx) +static inline void nvme_commit_sq_db(struct nvme_queue *nvmeq) { - struct nvme_queue *nvmeq = hctx->driver_data; - spin_lock(&nvmeq->sq_lock); if (nvmeq->sq_tail != nvmeq->last_sq_tail) nvme_write_sq_db(nvmeq, true); spin_unlock(&nvmeq->sq_lock); } +static void nvme_commit_rqs(struct blk_mq_hw_ctx *hctx) +{ + nvme_commit_sq_db(hctx->driver_data); +} + static void **nvme_pci_iod_list(struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); @@ -898,6 +901,12 @@ static blk_status_t nvme_prep_rq(struct nvme_dev *dev, struct request *req) if (ret) return ret; + if (unlikely((req->cmd_flags & REQ_COPY) && + (req_op(req) == REQ_OP_READ))) { + blk_mq_start_request(req); + return BLK_STS_OK; + } + if (blk_rq_nr_phys_segments(req)) { ret = nvme_map_data(dev, req, &iod->cmd); if (ret) @@ -944,6 +953,18 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, ret = nvme_prep_rq(dev, req); if (unlikely(ret)) return ret; + if (unlikely((req->cmd_flags & REQ_COPY) && + (req_op(req) == REQ_OP_READ))) { + blk_mq_set_request_complete(req); + blk_mq_end_request(req, BLK_STS_OK); + /* Commit the sq if copy read was the last req in the list, + * as copy read deoesn't update sq db + */ + if (bd->last) + nvme_commit_sq_db(nvmeq); + return ret; + } + spin_lock(&nvmeq->sq_lock); nvme_sq_copy_cmd(nvmeq, &iod->cmd); nvme_write_sq_db(nvmeq, bd->last); diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index bbad26b82b56..a8bf2a87f42a 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -2043,6 +2043,13 @@ static blk_status_t nvme_rdma_queue_rq(struct blk_mq_hw_ctx *hctx, nvme_start_request(rq); + if (unlikely((rq->cmd_flags & REQ_COPY) && + (req_op(rq) == REQ_OP_READ))) { + blk_mq_end_request(rq, BLK_STS_OK); + ret = BLK_STS_OK; + goto unmap_qe; + } + if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) && queue->pi_support && (c->common.opcode == nvme_cmd_write || diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 8cedc1ef496c..776e2ba84911 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -2346,6 +2346,11 @@ static blk_status_t nvme_tcp_setup_cmd_pdu(struct nvme_ns *ns, if (ret) return ret; + if (unlikely((rq->cmd_flags & REQ_COPY) && + (req_op(rq) == REQ_OP_READ))) { + return BLK_STS_OK; + } + req->state = NVME_TCP_SEND_CMD_PDU; req->status = cpu_to_le16(NVME_SC_SUCCESS); req->offset = 0; @@ -2414,6 +2419,17 @@ static blk_status_t nvme_tcp_queue_rq(struct blk_mq_hw_ctx *hctx, nvme_start_request(rq); + if (unlikely((rq->cmd_flags & REQ_COPY) && + (req_op(rq) == REQ_OP_READ))) { + blk_mq_set_request_complete(rq); + blk_mq_end_request(rq, BLK_STS_OK); + /* if copy read is the last req queue tcp reqs */ + if (bd->last && nvme_tcp_queue_more(queue)) + queue_work_on(queue->io_cpu, nvme_tcp_wq, + &queue->io_work); + return ret; + } + nvme_tcp_queue_request(req, true, bd->last); return BLK_STS_OK; diff --git a/drivers/nvme/host/trace.c b/drivers/nvme/host/trace.c index 1c36fcedea20..da4a7494e5a7 100644 --- a/drivers/nvme/host/trace.c +++ b/drivers/nvme/host/trace.c @@ -150,6 +150,23 @@ static const char *nvme_trace_read_write(struct trace_seq *p, u8 *cdw10) return ret; } +static const char *nvme_trace_copy(struct trace_seq *p, u8 *cdw10) +{ + const char *ret = trace_seq_buffer_ptr(p); + u64 slba = get_unaligned_le64(cdw10); + u8 nr_range = get_unaligned_le16(cdw10 + 8); + u16 control = get_unaligned_le16(cdw10 + 10); + u32 dsmgmt = get_unaligned_le32(cdw10 + 12); + u32 reftag = get_unaligned_le32(cdw10 + 16); + + trace_seq_printf(p, + "slba=%llu, nr_range=%u, ctrl=0x%x, dsmgmt=%u, reftag=%u", + slba, nr_range, control, dsmgmt, reftag); + trace_seq_putc(p, 0); + + return ret; +} + static const char *nvme_trace_dsm(struct trace_seq *p, u8 *cdw10) { const char *ret = trace_seq_buffer_ptr(p); @@ -243,6 +260,8 @@ const char *nvme_trace_parse_nvm_cmd(struct trace_seq *p, return nvme_trace_zone_mgmt_send(p, cdw10); case nvme_cmd_zone_mgmt_recv: return nvme_trace_zone_mgmt_recv(p, cdw10); + case nvme_cmd_copy: + return nvme_trace_copy(p, cdw10); default: return nvme_trace_common(p, cdw10); } diff --git a/include/linux/nvme.h b/include/linux/nvme.h index 4fad4aa245fb..e92dd69c745a 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -337,7 +337,7 @@ struct nvme_id_ctrl { __u8 nvscc; __u8 nwpc; __le16 acwu; - __u8 rsvd534[2]; + __le16 ocfs; __le32 sgls; __le32 mnan; __u8 rsvd544[224]; @@ -365,6 +365,7 @@ enum { NVME_CTRL_ONCS_WRITE_ZEROES = 1 << 3, NVME_CTRL_ONCS_RESERVATIONS = 1 << 5, NVME_CTRL_ONCS_TIMESTAMP = 1 << 6, + NVME_CTRL_ONCS_COPY = 1 << 8, NVME_CTRL_VWC_PRESENT = 1 << 0, NVME_CTRL_OACS_SEC_SUPP = 1 << 0, NVME_CTRL_OACS_NS_MNGT_SUPP = 1 << 3, @@ -414,7 +415,10 @@ struct nvme_id_ns { __le16 npdg; __le16 npda; __le16 nows; - __u8 rsvd74[18]; + __le16 mssrl; + __le32 mcl; + __u8 msrc; + __u8 rsvd91[11]; __le32 anagrpid; __u8 rsvd96[3]; __u8 nsattr; @@ -796,6 +800,7 @@ enum nvme_opcode { nvme_cmd_resv_report = 0x0e, nvme_cmd_resv_acquire = 0x11, nvme_cmd_resv_release = 0x15, + nvme_cmd_copy = 0x19, nvme_cmd_zone_mgmt_send = 0x79, nvme_cmd_zone_mgmt_recv = 0x7a, nvme_cmd_zone_append = 0x7d, @@ -818,7 +823,8 @@ enum nvme_opcode { nvme_opcode_name(nvme_cmd_resv_release), \ nvme_opcode_name(nvme_cmd_zone_mgmt_send), \ nvme_opcode_name(nvme_cmd_zone_mgmt_recv), \ - nvme_opcode_name(nvme_cmd_zone_append)) + nvme_opcode_name(nvme_cmd_zone_append), \ + nvme_opcode_name(nvme_cmd_copy)) @@ -995,6 +1001,36 @@ struct nvme_dsm_range { __le64 slba; }; +struct nvme_copy_command { + __u8 opcode; + __u8 flags; + __u16 command_id; + __le32 nsid; + __u64 rsvd2; + __le64 metadata; + union nvme_data_ptr dptr; + __le64 sdlba; + __u8 nr_range; + __u8 rsvd12; + __le16 control; + __le16 rsvd13; + __le16 dspec; + __le32 ilbrt; + __le16 lbat; + __le16 lbatm; +}; + +struct nvme_copy_range { + __le64 rsvd0; + __le64 slba; + __le16 nlb; + __le16 rsvd18; + __le32 rsvd20; + __le32 eilbrt; + __le16 elbat; + __le16 elbatm; +}; + struct nvme_write_zeroes_cmd { __u8 opcode; __u8 flags; @@ -1752,6 +1788,7 @@ struct nvme_command { struct nvme_download_firmware dlfw; struct nvme_format_cmd format; struct nvme_dsm_cmd dsm; + struct nvme_copy_command copy; struct nvme_write_zeroes_cmd write_zeroes; struct nvme_zone_mgmt_send_cmd zms; struct nvme_zone_mgmt_recv_cmd zmr; From patchwork Mon Feb 20 10:53:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nitesh Shetty X-Patchwork-Id: 13147449 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 60654C678DB for ; 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Mon, 20 Feb 2023 10:55:17 +0000 (GMT) From: Nitesh Shetty To: Jens Axboe , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Keith Busch , Christoph Hellwig , Sagi Grimberg , James Smart , Chaitanya Kulkarni , Alexander Viro Date: Mon, 20 Feb 2023 16:23:29 +0530 Message-Id: <20230220105336.3810-7-nj.shetty@samsung.com> In-Reply-To: <20230220105336.3810-1-nj.shetty@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01Te0xbdRTO795yW0iqF4bhN5ax5i7LBMaj2NbLpBvioneDOcKi0aFh13Kl SGlrH244F6C8hMk6QBZX2OiQoTAEBKx0HThRLNAQNDAQkAGRLoAZFNE9YBPbtej++84533ee ORzU7ww7kJMu1zAqOS0jMB+W6YfgkLAQ2aok0n5jO9ky8BNK6s49QsmrU3qMPO94gJLrg0Mo 2bVU5UWO3zAj5PXacoRsuNqLkJbLKwjZu3EHI8t7RgFpv2lAyK6JUPJ6Vz+LHL5WjZE19XY2 2VORh5Cdc7mANK3XoGTzH8sssm9iGzn0yOoVG0ANj8RThulBjDIbptjU0K2vWdTwoJZqayzG qPa6bMoynoNRpXlLTkLBtBe13H0To852NAKq3XaKWm0Lotrm7iCJTx/LiJEydCqj4jFyiSI1 XZ4mJuKPpryUIhRF8sP40eTzBE9OZzJi4kBCYtjL6TLnCgjeB7RM63Ql0mo1EbEvRqXQahie VKHWiAlGmSpTCpThajpTrZWnhcsZzV5+ZGSU0Ek8niFtXrGhyof7T3Yv2r1ygElYArw5EBfA 9oXfsRLgw/HDLQDOTK55jD8B/GXYgriNuwD+tdaHbUqu/Kz3BLoA1K9Y2W4jD4G1rausEsDh YHgotG1wXAJ//DcEmm07XRwUn0Fgja4OuAJb8AS4dnGR7cIsfBesaFxiuTAXj4YXBxrZrjwQ j4D6aV8X9Mb3wnv5WW6GL+y/MPeYjeI7YN43VagrPcS/8IZ3y+o8jR6A1spyxI23wEVrB9uN A+GCvtCDT8CGT7/E3OJ8AA1jBuAO7IcFA3rUVRjFg2HLtQi3ezusHGhG3IWfgqXrc578XNh5 aRPvhE0tRk8PW+HovVzMPQoFh6wS96pKAWy1ziHnAM/wxDyGJ+Yx/F/ZCNBGsJVRqjPTGLVQ GSVnTvx3ZIkisw08/oqQQ51gdsYR3gMQDugBkIMS/twN7qrEj5tKZ33IqBQpKq2MUfcAoXPd ZWjgMxKF863kmhS+IDpSIBKJBNHPifhEAHe3uF/ih6fRGiaDYZSMalOHcLwDc5DQ0NjTV4ou 2L2lTaIXb1U4xtXiSV394YkjvW+98/ex4jPvFVSPnJ5psCT3OUbqjiYIPznLvp8xchv49Ask xWnZJr/Ln6lUr+he6Hgz2BLwY1xL+0d0VKW/4/7YtspVh/Z9pDToNqUd/bw6+dd8cdK3WbuM D4IJrXV+ut4WdLLz2bE1NHa+UsErahvc4SWdzx04NDXL2HT1E/ETrXt27S6K0X23Qn+80RzI Dor7vnypatJssvcqil49ePi8rmTfKEM8jP1q9t3sJHC8e6l22Zz0ujL5bew186nC0tzs2VCJ KbPpks63Kqwsbk+Aztdox42Di8axQvaRN/6xzosWmiPWZwiWWkrzQ1CVmv4Xvlng5p4EAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA02Re0hTYRjG+845Ozsaq+OU/FTSWEVl5ZSyvqKmFdWJMiqIblItO5nk5trR zPojb0Eq5dC8tHkrauisSTNveSFWs3kZWlp0dVQuKdlUVpiamVOC/nve9/k97wvvS+FCI+FL xcjjWaVcGisi3Ynap6KA1YX7nVHB1nIRqmpvxVGqahJHlR+zSZQ/PIajCUsXjpodGh56+6QB Q013cjBUUWnCUOPtEQyZpuwkyjG+Bsj2So2h5ncrUVNzG4F6HheRqFRr4yNjbhqG6vtTAKqd KMWRfnCIQOZ3fqhr8jkv3Jvp6d3NqK0WkmlQf+QzXX0PCabHksAYdBkkU333CtP4Nplkrqc5 poGrVh4z1PKKZG480gGmuuMy4zT4M4Z+O7Zv/lH3TafZ2JgLrFIsOel+Vj/SgSt+h11s+W7j JYPa0EzgRkF6LbzXnY1lAndKSDcCqDHoiVnDB2onn+Gz2hNW/Bngz0IpGDQXVYJMQFEkvRJ2 TFGuvhf9FYOWvs+4q8BpBwZ1n7Q8V9qT3gPHi7/zXZqgl8JcnWNmg4DeAIvbdXzXIEiLYbbV wyXd6I1wND3JRQinCXNONZilPWDbrf6ZJE4HwLQaDa4CtPo/S/2fVQYwHfBhFZwsWsaFKELk bGIQJ5VxCfLooKg4mQHMvDlwRT2o0w0HGQFGASOAFC7yEkwJnFFCwWlp0iVWGXdCmRDLckbg RxEib0F3ZtsJIR0tjWfPsayCVf5zMcrNNxkTh450VmWLnEsaHd/2PymSdBMl6/Xyz3nbxr8E SyWaHarhVrttRViiWum7mm1wHFx/7VBfzd5Ibe+iNf6nthR6HUvviGjPfRCnWHXbrEr/PX1O +4GSrHHfNVbT9sjRn6ZOznozPSLUmVCsOX9o7MvkvAFQHrg561dLU3DBuUudVeLB5Un8rIwP vUfaLPpUbaGy1+PlxHOwwCdgzta6+7Gpywr8dxE/TM0DXja3uWrFEvnOM4fzU6bK/caOV9R9 kuTM2ffm0ULDcH2wSbZ5Ez7+MN473EyGqY++r4lp9eRkaWWR9xZXSAoW5O1+nNxEcuKIdS+2 UQWqIt4BPOSqvSxMRHBnpSGBuJKT/gVUrOT4VQMAAA== X-CMS-MailID: 20230220105520epcas5p34fe94decec6573d9b7b3df5df9286ef7 X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230220105520epcas5p34fe94decec6573d9b7b3df5df9286ef7 References: <20230220105336.3810-1-nj.shetty@samsung.com> X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 6/8] nvmet: add copy command support for bdev and file ns X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Add support for handling target command on target. For bdev-ns we call into blkdev_issue_copy, which the block layer completes by a offloaded copy request to backend bdev or by emulating the request. For file-ns we call vfs_copy_file_range to service our request. Currently target always shows copy capability by setting NVME_CTRL_ONCS_COPY in controller ONCS. Signed-off-by: Nitesh Shetty Signed-off-by: Anuj Gupta --- drivers/nvme/target/admin-cmd.c | 9 +++-- drivers/nvme/target/io-cmd-bdev.c | 58 +++++++++++++++++++++++++++++++ drivers/nvme/target/io-cmd-file.c | 52 +++++++++++++++++++++++++++ drivers/nvme/target/loop.c | 6 ++++ drivers/nvme/target/nvmet.h | 1 + 5 files changed, 124 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index 6a54ed6fb121..66a45121f5a0 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -433,8 +433,7 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req) id->nn = cpu_to_le32(NVMET_MAX_NAMESPACES); id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES); id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM | - NVME_CTRL_ONCS_WRITE_ZEROES); - + NVME_CTRL_ONCS_WRITE_ZEROES | NVME_CTRL_ONCS_COPY); /* XXX: don't report vwc if the underlying device is write through */ id->vwc = NVME_CTRL_VWC_PRESENT; @@ -536,6 +535,12 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req) if (req->ns->bdev) nvmet_bdev_set_limits(req->ns->bdev, id); + else { + id->msrc = (u8)to0based(BIO_MAX_VECS - 1); + id->mssrl = cpu_to_le16(BIO_MAX_VECS << + (PAGE_SHIFT - SECTOR_SHIFT)); + id->mcl = cpu_to_le32(le16_to_cpu(id->mssrl)); + } /* * We just provide a single LBA format that matches what the diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c index c2d6cea0236b..0af273097aa4 100644 --- a/drivers/nvme/target/io-cmd-bdev.c +++ b/drivers/nvme/target/io-cmd-bdev.c @@ -46,6 +46,19 @@ void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id) id->npda = id->npdg; /* NOWS = Namespace Optimal Write Size */ id->nows = to0based(bdev_io_opt(bdev) / bdev_logical_block_size(bdev)); + + /*Copy limits*/ + if (bdev_max_copy_sectors(bdev)) { + id->msrc = id->msrc; + id->mssrl = cpu_to_le16((bdev_max_copy_sectors(bdev) << + SECTOR_SHIFT) / bdev_logical_block_size(bdev)); + id->mcl = cpu_to_le32(id->mssrl); + } else { + id->msrc = (u8)to0based(BIO_MAX_VECS - 1); + id->mssrl = cpu_to_le16((BIO_MAX_VECS << PAGE_SHIFT) / + bdev_logical_block_size(bdev)); + id->mcl = cpu_to_le32(id->mssrl); + } } void nvmet_bdev_ns_disable(struct nvmet_ns *ns) @@ -184,6 +197,19 @@ static void nvmet_bio_done(struct bio *bio) nvmet_req_bio_put(req, bio); } +static void nvmet_bdev_copy_end_io(void *private, int comp_len) +{ + struct nvmet_req *req = (struct nvmet_req *)private; + + if (comp_len == req->copy_len) { + req->cqe->result.u32 = cpu_to_le32(1); + nvmet_req_complete(req, errno_to_nvme_status(req, 0)); + } else { + req->cqe->result.u32 = cpu_to_le32(0); + nvmet_req_complete(req, blk_to_nvme_status(req, BLK_STS_IOERR)); + } +} + #ifdef CONFIG_BLK_DEV_INTEGRITY static int nvmet_bdev_alloc_bip(struct nvmet_req *req, struct bio *bio, struct sg_mapping_iter *miter) @@ -450,6 +476,34 @@ static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req) } } +/* At present we handle only one range entry */ +static void nvmet_bdev_execute_copy(struct nvmet_req *req) +{ + struct nvme_copy_range range; + struct nvme_command *cmnd = req->cmd; + int ret; + + + ret = nvmet_copy_from_sgl(req, 0, &range, sizeof(range)); + if (ret) + goto out; + + ret = blkdev_issue_copy(req->ns->bdev, + le64_to_cpu(cmnd->copy.sdlba) << req->ns->blksize_shift, + req->ns->bdev, + le64_to_cpu(range.slba) << req->ns->blksize_shift, + (le16_to_cpu(range.nlb) + 1) << req->ns->blksize_shift, + nvmet_bdev_copy_end_io, (void *)req, GFP_KERNEL); + if (ret) { + req->cqe->result.u32 = cpu_to_le32(0); + nvmet_req_complete(req, blk_to_nvme_status(req, BLK_STS_IOERR)); + } + + return; +out: + nvmet_req_complete(req, errno_to_nvme_status(req, ret)); +} + u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req) { switch (req->cmd->common.opcode) { @@ -468,6 +522,10 @@ u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req) case nvme_cmd_write_zeroes: req->execute = nvmet_bdev_execute_write_zeroes; return 0; + case nvme_cmd_copy: + req->execute = nvmet_bdev_execute_copy; + return 0; + default: return nvmet_report_invalid_opcode(req); } diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c index 871c4f32f443..76db307f5b30 100644 --- a/drivers/nvme/target/io-cmd-file.c +++ b/drivers/nvme/target/io-cmd-file.c @@ -328,6 +328,49 @@ static void nvmet_file_dsm_work(struct work_struct *w) } } +static void nvmet_file_copy_work(struct work_struct *w) +{ + struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); + int nr_range; + loff_t pos; + struct nvme_command *cmnd = req->cmd; + int ret = 0, len = 0, src, id; + + nr_range = cmnd->copy.nr_range + 1; + pos = le64_to_cpu(req->cmd->copy.sdlba) << req->ns->blksize_shift; + if (unlikely(pos + req->transfer_len > req->ns->size)) { + nvmet_req_complete(req, errno_to_nvme_status(req, -ENOSPC)); + return; + } + + for (id = 0 ; id < nr_range; id++) { + struct nvme_copy_range range; + + ret = nvmet_copy_from_sgl(req, id * sizeof(range), &range, + sizeof(range)); + if (ret) + goto out; + + len = (le16_to_cpu(range.nlb) + 1) << (req->ns->blksize_shift); + src = (le64_to_cpu(range.slba) << (req->ns->blksize_shift)); + ret = vfs_copy_file_range(req->ns->file, src, req->ns->file, + pos, len, 0); +out: + if (ret != len) { + pos += ret; + req->cqe->result.u32 = cpu_to_le32(id); + nvmet_req_complete(req, ret < 0 ? + errno_to_nvme_status(req, ret) : + errno_to_nvme_status(req, -EIO)); + return; + + } else + pos += len; + } + + nvmet_req_complete(req, 0); + +} static void nvmet_file_execute_dsm(struct nvmet_req *req) { if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req))) @@ -336,6 +379,12 @@ static void nvmet_file_execute_dsm(struct nvmet_req *req) queue_work(nvmet_wq, &req->f.work); } +static void nvmet_file_execute_copy(struct nvmet_req *req) +{ + INIT_WORK(&req->f.work, nvmet_file_copy_work); + queue_work(nvmet_wq, &req->f.work); +} + static void nvmet_file_write_zeroes_work(struct work_struct *w) { struct nvmet_req *req = container_of(w, struct nvmet_req, f.work); @@ -382,6 +431,9 @@ u16 nvmet_file_parse_io_cmd(struct nvmet_req *req) case nvme_cmd_write_zeroes: req->execute = nvmet_file_execute_write_zeroes; return 0; + case nvme_cmd_copy: + req->execute = nvmet_file_execute_copy; + return 0; default: return nvmet_report_invalid_opcode(req); } diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c index f2d24b2d992f..d18ed8067a15 100644 --- a/drivers/nvme/target/loop.c +++ b/drivers/nvme/target/loop.c @@ -146,6 +146,12 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, return ret; nvme_start_request(req); + if (unlikely((req->cmd_flags & REQ_COPY) && + (req_op(req) == REQ_OP_READ))) { + blk_mq_set_request_complete(req); + blk_mq_end_request(req, BLK_STS_OK); + return BLK_STS_OK; + } iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; iod->req.port = queue->ctrl->port; if (!nvmet_req_init(&iod->req, &queue->nvme_cq, diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index 89bedfcd974c..69ed4c8469e5 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -393,6 +393,7 @@ struct nvmet_req { struct device *p2p_client; u16 error_loc; u64 error_slba; + size_t copy_len; }; #define NVMET_MAX_MPOOL_BVEC 16 From patchwork Mon Feb 20 10:53:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nitesh Shetty X-Patchwork-Id: 13147450 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 36ED5C6FA99 for ; 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Mon, 20 Feb 2023 10:55:25 +0000 (GMT) From: Nitesh Shetty To: Jens Axboe , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Keith Busch , Christoph Hellwig , Sagi Grimberg , James Smart , Chaitanya Kulkarni , Alexander Viro Date: Mon, 20 Feb 2023 16:23:30 +0530 Message-Id: <20230220105336.3810-8-nj.shetty@samsung.com> In-Reply-To: <20230220105336.3810-1-nj.shetty@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02Tf1CTdRzHeZ5nezbI2cMP4evUWjMsQGALWA/EJJPo6bCTOzM4rcZz44ER Y5t7NhS5DgbaBRzMUDgYXBBSMjAQEI6fZvMQGS0s0IIYCId/lAfYyEg5pI0Hy/9en8/n/fm+ 7/P53oeLeBVz+Nx0lY7SqkilEPVgdV0PCAwWKZflosk2H7zVegPB88+uIXiz3YjiFQ8eIfiq bRTBBxar2fjEtR4Y768vg3Fz8yCM9331J4wPri+geJnlDoTfu22C8YHJILx/YJiFj/XWoHjt N/c4uOVcAYx3zxsgvGu1FsFb7i+x8JuTO/DRtSH2m37E2Hg8YZqxoUSPyc4hRqfbWMSYTU+0 NxWiREdDLtE3kYcSJQWLTsGZGTaxdPU2SpReaYKIjpEcYrn9BaJ9fgFOeP5oRrSCIlMorYBS ydUp6ao0qTD+sOyALEIiEgeLI/HXhQIVmUlJhbEHE4Lj0pXOFQgFWaRS70wlkDQtDN0XrVXr dZRAoaZ1UiGlSVFqwjUhNJlJ61VpISpKFyUWiV6LcAqTMxTjJTfYGjv/ZEuVEc2DJrYVQe5c gIWDJ9UWtAjy4HphfRCoumXlMIEDAp93PoaYYBkCjqs2p4y70WJ4fJTJ90Lg/ugCzAQFMJg0 9rNcIhQLAiPrXJeFDzYFg56R3S4Ngt2FQW1+A+QqeGORoPnvetjFLMwf9DdWbDDPmTcVNcGM WSgwzni60B2LAiunsxmFJxiumme5GMFeBAWd1YjreYDVuoO2wZ/YzGixYOjnaZhhb/DH0BUO w3zwu/GzTT4BzOcbUab5NARMv5ggphADzliNiMsYwQJAa28ok94Fyq0tMGO8FZSszm++zwPd Xz7l3eBSax3K8HZwZ8WwyQQo6ru2ud0SCDy6tMY5CwlMzwxkemYg0//WdRDSBG2nNHRmGkVH aMJU1In/PlmuzmyHNq4iML4bmrv7IMQCwVzIAgEuIvThrfOW5V68FDL7FKVVy7R6JUVboAjn vr9A+NvkaudZqXQycXikKFwikYRHhknEQj/eK9JhuReWRuqoDIrSUNqnfTDXnZ8Hpx+0V1x8 aWdWGJZeeDFu55akmuP1cdZMmf/+55qzPQLDfistj63bK93zncIRQJIHluh3ZwtXg0QXkkun VorNlfq/TmpCtBHFx8w5USO5tpUfy/OPXPZ8q/KHqdQ3OqeaCxN7s/y02bNmu1l72SZJtu/x enW2TRFm/Ohw0ts1hzoKHVuOiV7u18wZKkN+zatO3fr1jkWFz6FEw9ZvHWz/96n39kcHLqU8 SVpUfSAtsE43PBywCt7pmjylTaXLbrr1DO1iycY7vRPKvh/9JNlt73E3dQd1ITEvptQXQc5X /+Mgu4LPwX2yjEbfjzUxHz7kH7m+b+JWTq7k0zr3OZ+xJF8Dv1PIohWkOBDR0uS/jRpmh54E AAA= X-Brightmail-Tracker: H4sIAAAAAAAAA02RfUgTYRzHee5u52nMzrnq0ki5FGWWZUU8hllBxVlZKlTkH65hN62crZ1a voAzLdjCtFWWM8g3TCdoatnMrWy9aSaWU0HBl2L2gu8aWtk0Twn67/P7fj8/fg88BCp6gbkR Z+ITWFW8LI7GnbD6l7THpqLw6egtWpMAVr97g8LLuXYUVvbl4DBv4hcK59raUWgeKxDAnqYG BJqKdQisqHyNwMaiSQS+XhjFoc7SDeBQlx6B5l4/aDK3YND69B4O75cNOUDLzUwEGm0ZANbP 3Udh1fA4Bpt73WG7/a1gzxrG2nmI0Q+04UyDvs+Bae+vwRhrWyJTa9DgTF1pOtPYo8aZ7Myx ReHKgIAZf9aFM9cfGQBT15rKTNeuZ2pto0jYykinoNNs3JkkVrU5+JRTbGf2G4Gyz+1SVX4O rgY9q7SAIChyO5XxO1ILnAgRaQTUtQdmBy1wXMzXUmX2V+gyu1IV818dlqUMhBp8Ugf4ZZz0 o1oXCD4Xk18Qqq3/M8oPKDmGUIZPZQJ+25UMpCpnihGeMdKbMpXnLbFwMddrDcjyKzZTOQMu PDqSO6nZrGTeEC0azTr+FG+7UC35NoxnlPSgMh8XoLmA1P9X6f+rCgFiAGtZJaeIUXAByq3x 7EV/TqbgEuNj/KPPK2rB0i9LJEZgMkz4WwBCAAugCJQWCxeE09Ei4WlZcgqrOi9VJcaxnAW4 Exi9RvhB2yIVkTGyBPYcyypZ1b8WIRzd1Ijs5O2Pq49+po0+4RtnYiV329N9Ako1w3b8eX6T tG6+IztYU/3WnJhWYqi44XesTDpqw9+n3byArrATox3fMdnqh00hw9MbC3JLXMXNt7sTvELL C4/20l7yYGtEyHZxvVLjzGYPeW47kqDqSZotDvDMnPTacnhX9fcDpSmTTdVRmlD3gyJ5zU+f EdMMd2Jdl7foT2uYc2PEbuf+jsHhvJH8U2LfoLB+a7exT2DEOstf4ZYi+mqI/A4XBdJnzw7W /IjTNfxSGEc8drgPyqNsJRLFLvXAXnyuWBWqTl0okLfQ+30L9Q2Gs1Ld1NjxfVmpU0Ug8Fbw hpzJGjfuWzKNcbGyAAmq4mR/AS8xISlUAwAA X-CMS-MailID: 20230220105529epcas5p447cd449f13da54794e391b78bd1f5956 X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230220105529epcas5p447cd449f13da54794e391b78bd1f5956 References: <20230220105336.3810-1-nj.shetty@samsung.com> X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 7/8] dm: Add support for copy offload. X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Before enabling copy for dm target, check if underlying devices and dm target support copy. Avoid split happening inside dm target. Fail early if the request needs split, currently splitting copy request is not supported. Signed-off-by: Nitesh Shetty --- drivers/md/dm-table.c | 42 +++++++++++++++++++++++++++++++++++ drivers/md/dm.c | 7 ++++++ include/linux/device-mapper.h | 5 +++++ 3 files changed, 54 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 8541d5688f3a..4a1bbbb2493b 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1875,6 +1875,39 @@ static bool dm_table_supports_nowait(struct dm_table *t) return true; } +static int device_not_copy_capable(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) +{ + struct request_queue *q = bdev_get_queue(dev->bdev); + + return !blk_queue_copy(q); +} + +static bool dm_table_supports_copy(struct dm_table *t) +{ + struct dm_target *ti; + unsigned int i; + + for (i = 0; i < t->num_targets; i++) { + ti = dm_table_get_target(t, i); + + if (!ti->copy_offload_supported) + return false; + + /* + * target provides copy support (as implied by setting + * 'copy_offload_supported') + * and it relies on _all_ data devices having copy support. + */ + if (!ti->type->iterate_devices || + ti->type->iterate_devices(ti, + device_not_copy_capable, NULL)) + return false; + } + + return true; +} + static int device_not_discard_capable(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { @@ -1957,6 +1990,15 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, q->limits.discard_misaligned = 0; } + if (!dm_table_supports_copy(t)) { + blk_queue_flag_clear(QUEUE_FLAG_COPY, q); + /* Must also clear copy limits... */ + q->limits.max_copy_sectors = 0; + q->limits.max_copy_sectors_hw = 0; + } else { + blk_queue_flag_set(QUEUE_FLAG_COPY, q); + } + if (!dm_table_supports_secure_erase(t)) q->limits.max_secure_erase_sectors = 0; diff --git a/drivers/md/dm.c b/drivers/md/dm.c index b424a6ee27ba..0b04093fbeb2 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1690,6 +1690,13 @@ static blk_status_t __split_and_process_bio(struct clone_info *ci) if (unlikely(ci->is_abnormal_io)) return __process_abnormal_io(ci, ti); + if ((unlikely(op_is_copy(ci->bio->bi_opf)) && + max_io_len(ti, ci->sector) < ci->sector_count)) { + DMERR("Error, IO size(%u) > max target size(%llu)\n", + ci->sector_count, max_io_len(ti, ci->sector)); + return BLK_STS_IOERR; + } + /* * Only support bio polling for normal IO, and the target io is * exactly inside the dm_io instance (verified in dm_poll_dm_io) diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 04c6acf7faaa..da4e77e81011 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -379,6 +379,11 @@ struct dm_target { * bio_set_dev(). NOTE: ideally a target should _not_ need this. */ bool needs_bio_set_dev:1; + + /* + * copy offload is supported + */ + bool copy_offload_supported:1; }; void *dm_per_bio_data(struct bio *bio, size_t data_size); From patchwork Mon Feb 20 10:53:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nitesh Shetty X-Patchwork-Id: 13147445 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E8895C64EC7 for ; Tue, 21 Feb 2023 07:40:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1676965225; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post; 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Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 X-Mailman-Approved-At: Tue, 21 Feb 2023 07:40:17 +0000 Subject: [dm-devel] [PATCH v7 8/8] dm: Enable copy offload for dm-linear target X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: bvanassche@acm.org, joshi.k@samsung.com, gost.dev@samsung.com, anuj20.g@samsung.com, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, ming.lei@redhat.com, linux-block@vger.kernel.org, nitheshshetty@gmail.com, linux-fsdevel@vger.kernel.org, damien.lemoal@opensource.wdc.com, Nitesh Shetty Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Setting copy_offload_supported flag to enable offload. Signed-off-by: Nitesh Shetty --- drivers/md/dm-linear.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 3212ef6aa81b..b4b57bead495 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -61,6 +61,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv) ti->num_discard_bios = 1; ti->num_secure_erase_bios = 1; ti->num_write_zeroes_bios = 1; + ti->copy_offload_supported = 1; ti->private = lc; return 0;