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Mon, 5 Jun 2023 12:24:11 +0000 (GMT) From: Nitesh Shetty To: Jens Axboe , Jonathan Corbet , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Keith Busch , Christoph Hellwig , Sagi Grimberg , James Smart , Chaitanya Kulkarni , Alexander Viro , Christian Brauner Cc: martin.petersen@oracle.com, linux-scsi@vger.kernel.org, willy@infradead.org, hare@suse.de, djwong@kernel.org, bvanassche@acm.org, ming.lei@redhat.com, dlemoal@kernel.org, nitheshshetty@gmail.com, gost.dev@samsung.com, Nitesh Shetty , Damien Le Moal , Anuj Gupta , Vincent Fu , 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 v12 9/9] null_blk: add support for copy offload Date: Mon, 5 Jun 2023 17:47:25 +0530 Message-Id: <20230605121732.28468-10-nj.shetty@samsung.com> X-Mailer: git-send-email 2.35.1.500.gb896f729e2 In-Reply-To: <20230605121732.28468-1-nj.shetty@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01Te0xTZxT3u7e9FLa6y2t8QphNJ25AeBSBfaAMzFCvsEwCLpuSDCu9AUJp m7bopjLAjsdgtAhjbNWJCCqvSAZKShEwRXkjc4gPGMON4iI4Xk5gVGAthc3/fr9zfuc75/y+ HBZuo7FwZCWI5LRUxBdyCStGQ5urq8fewRSBd2snA9V2t+PodP4yjqpHVASabJsD6LuZf3Ck v5kFkKGvH0cD+s3ocWswap46y0SPbjZi6MbFAgxVVt/GUFPpLIYKdPcBGh9UY6h5yB2VZpYz 0I3mLgYa0J4jUMnlcQuU+0BDoCsdKxjSFSowpNGnA9RgKMHR1clpBuocckJjudkA9S93MJFh 8RwRspUauBdOqUf7CKpRPWJB9f/2E4Oqr3CjBvqSqbqqrwmqvjyVanqURlBlykImlaeYMioz RpnU7PgQg5puGSQo5bUqQNX3nIywOZy4K57mC2gphxbFigUJorggbnhUzAcxfv7ePA9eAHqP yxHxk+ggbuiHER57E4RGt7icY3xhsjEUwZfJuF7v75KKk+U0J14skwdxaYlAKPGVeMr4SbJk UZyniJYH8ry9ffyMwiOJ8cWna5iSidDPx6sqQBpoC8gBlixI+sKf035l5gArlg3ZBOAtQysw kzkApwvqLMxkHsCsxovYRklLaw9hTjQDmPnLM9xMMjBYc2fOqGKxCNId9qyyTHE7sgKH6Qu9 DBPByVIGHH7yDTA9ZUsGw5HnStyEGaQLvDSWRpiK2eRO2Pt9lAlC0guqRq1NCktj9Gmfbk3N Jq1h1w96hgnj5FaouH52bQZITljC1VuXCfOkofCPphqmGdvCiY5rFmbsCJ+qMtfxcVj5bQVh Lv4KQPUDNTAngmFGtwo3DYGTrrBW62UOO8Oi7quYufFmmGfQr7vChprzG/htWFN7YX2GLfD+ Qvo6pmD53F3MbJbS2Ku/hZkPOOpXFlK/spD6/9YXAF4FttASWVIcLfOT+Ijo4/99c6w4qQ6s nZBbmAb8/njGUwcwFtAByMK5dmxt2EmBDVvA/+IELRXHSJOFtEwH/Ix+n8Ed7WPFxhsUyWN4 vgHevv7+/r4BO/x5XAf2O0FdsTZkHF9OJ9K0hJZu1GEsS8c0bL9D4CeNXxrsh7vkpYt7xos/ fuboHr2kEAonU10IJ69PF1/6WB0DVs050YNaWX7q0dlDR4vpfWHS8KmUwsLOity0ot0h8pKC h0V1VMsY6n234c6OwwtHBJPV1dkPh18G8ZTN+5VO00kc1fwb2rdWrrjM/RVkbKHofz3zniyy /qPC7Q1v9v+dZZWQmnvXp8xzKc+zbzAKBp9hupC9T3LnBaJWzWtl27vGDmisX2xz7oj8M6Ry Hz916PlydvWLyEMrA+kxbPxg3u4T6dtUe0ZX4w/mBvPCfQKvK2Y2DdvZtq/sDEupvmSoLzgl PqU94Lz02dCPDnm3O2tSVmbs26P14TPnN3EZsng+zw2Xyvj/AnmzEAjLBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrDIsWRmVeSWpSXmKPExsWy7bCSvO77y7UpBie/GVmsP3WM2aJpwl9m i9V3+9ksXh/+xGgx7cNPZosnB9oZLX6fPc9scfkJn8WD/fYWe9/NZrW4eWAnk8WeRZOYLFau PspksXvhRyaLSYeuMVo8vTqLyWLvLW2LhW1LWCz27D3JYnF51xw2i/nLnrJbdF/fwWax/Pg/ JotDk5uZLHY8aWS02PZ7PrPFutfvWSxO3JK2eNzdwWhx/u9xVovfP+awOch7XL7i7THr/lk2 j52z7rJ7nL+3kcVj8wotj8tnSz02repk89i8pN5j980GNo/FfZNZPXqb3wFVtt5n9fj49BaL x/t9V9k8+rasYvTYfLo6QCiKyyYlNSezLLVI3y6BK2N60xrWglcuFU9XrWBsYDxs2cXIySEh YCKxb/9pti5GLg4hgd2MEv/PPGSHSEhKLPt7hBnCFpZY+e85O0RRM5PEs5tHWbsYOTjYBLQl Tv/nAImLCGxhljj7azIriMMssJ1FYsn6pawg3cIC9hJ3P/eBTWIRUJVY+riBDaSZV8Ba4syM YBBTQkBfov++IEgFJ1D05dlDzCBhIQEriavvbUDCvAKCEidnPmEBsZkF5CWat85mnsAoMAtJ ahaS1AJGplWMkqkFxbnpucWGBYZ5qeV6xYm5xaV56XrJ+bmbGMEJQktzB+P2VR/0DjEycTAe YpTgYFYS4d3lVZ0ixJuSWFmVWpQfX1Sak1p8iFGag0VJnPdC18l4IYH0xJLU7NTUgtQimCwT B6dUA9PO2Bkd5eIck7INnlrP6bnyleE0l0RO8JOfn/Z8NHP5HPjj1O5gZhUTH8XXJhkRf/Tf lCR9KLlexq1Y5fmObc9s5cblHt9y5iSaz55v9GzFooyLfKvtI+9nXch+I+1uKbre+q1R2803 d8+v74usFP69IvpluAnLcmOFqoPBX+zvvDnBFGrX++U422xOP2+P07WBF/K/vlWeOWvt3POP Nhh9kPK6e+Z+R/DUhjlWHSlMv48aCMetKhNJZvGan5l3IvDetq+Ghaq3mpUlrO7sPJy28F2L s8DDzWdV6xecPS2ot0uh+e0jq+UsofeNza9ckCqLbsgJUVpWM9dJ0Hj+cttGEeETH5dF+HS8 SK5RWa3EUpyRaKjFXFScCAD58AP4fwMAAA== X-CMS-MailID: 20230605122416epcas5p3b37c08a7bf7ad57361b22be0f30d3bf7 X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230605122416epcas5p3b37c08a7bf7ad57361b22be0f30d3bf7 References: <20230605121732.28468-1-nj.shetty@samsung.com> X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_PASS,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1767866778686465842?= X-GMAIL-MSGID: =?utf-8?q?1767866778686465842?= Implementaion 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. Suggested-by: Damien Le Moal Signed-off-by: Anuj Gupta Signed-off-by: Nitesh Shetty Signed-off-by: Vincent Fu --- Documentation/block/null_blk.rst | 5 ++ drivers/block/null_blk/main.c | 108 ++++++++++++++++++++++++++++-- drivers/block/null_blk/null_blk.h | 8 +++ 3 files changed, 116 insertions(+), 5 deletions(-) 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 b3fedafe301e..34e009b3ebd5 100644 --- a/drivers/block/null_blk/main.c +++ b/drivers/block/null_blk/main.c @@ -157,6 +157,10 @@ 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 = 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"); @@ -409,6 +413,7 @@ 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); @@ -550,6 +555,7 @@ 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, @@ -656,7 +662,8 @@ 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); @@ -722,6 +729,7 @@ 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; @@ -1271,6 +1279,78 @@ static int null_transfer(struct nullb *nullb, struct page *page, return err; } +static inline void nullb_setup_copy_read(struct nullb *nullb, struct bio *bio) +{ + struct nullb_copy_token *token = bvec_kmap_local(&bio->bi_io_vec[0]); + + token->subsys = "nullb"; + token->sector_in = bio->bi_iter.bi_sector; + token->nullb = nullb; + token->sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT; +} + +static inline int nullb_setup_copy_write(struct nullb *nullb, + struct bio *bio, bool is_fua) +{ + struct nullb_copy_token *token = bvec_kmap_local(&bio->bi_io_vec[0]); + sector_t sector_in, sector_out; + void *in, *out; + size_t rem, temp; + unsigned long offset_in, offset_out; + struct nullb_page *t_page_in, *t_page_out; + int ret = -EIO; + + if (unlikely(memcmp(token->subsys, "nullb", 5))) + return -EINVAL; + if (unlikely(token->nullb != nullb)) + return -EINVAL; + if (WARN_ON(token->sectors != bio->bi_iter.bi_size >> SECTOR_SHIFT)) + return -EINVAL; + + sector_in = token->sector_in; + sector_out = bio->bi_iter.bi_sector; + rem = token->sectors << SECTOR_SHIFT; + + spin_lock_irq(&nullb->lock); + while (rem > 0) { + temp = 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, temp); + 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 -= temp; + sector_in += temp >> SECTOR_SHIFT; + sector_out += temp >> SECTOR_SHIFT; + } + + ret = 0; +err: + spin_unlock_irq(&nullb->lock); + return ret; +} + static int null_handle_rq(struct nullb_cmd *cmd) { struct request *rq = cmd->rq; @@ -1280,13 +1360,20 @@ 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 (rq->cmd_flags & REQ_COPY) { + if (op_is_write(req_op(rq))) + return nullb_setup_copy_write(nullb, rq->bio, fua); + nullb_setup_copy_read(nullb, rq->bio); + return 0; + } 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; @@ -1307,13 +1394,20 @@ static int null_handle_bio(struct nullb_cmd *cmd) sector_t sector = bio->bi_iter.bi_sector; struct bio_vec bvec; struct bvec_iter iter; + bool fua = bio->bi_opf & REQ_FUA; + + if (bio->bi_opf & REQ_COPY) { + if (op_is_write(bio_op(bio))) + return nullb_setup_copy_write(nullb, bio, fua); + nullb_setup_copy_read(nullb, bio); + return 0; + } spin_lock_irq(&nullb->lock); bio_for_each_segment(bvec, bio, iter) { len = bvec.bv_len; err = null_transfer(nullb, bvec.bv_page, len, bvec.bv_offset, - op_is_write(bio_op(bio)), sector, - bio->bi_opf & REQ_FUA); + op_is_write(bio_op(bio)), sector, fua); if (err) { spin_unlock_irq(&nullb->lock); return err; @@ -2161,6 +2255,10 @@ 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_sectors_hw(nullb->q, + dev->copy_max_bytes >> SECTOR_SHIFT); + if (dev->copy_max_bytes) + blk_queue_flag_set(QUEUE_FLAG_COPY, nullb->disk->queue); 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..3dda593b0747 100644 --- a/drivers/block/null_blk/null_blk.h +++ b/drivers/block/null_blk/null_blk.h @@ -67,6 +67,13 @@ enum { NULL_Q_MQ = 2, }; +struct nullb_copy_token { + char *subsys; + struct nullb *nullb; + sector_t sector_in; + sector_t sectors; +}; + struct nullb_device { struct nullb *nullb; struct config_group group; @@ -107,6 +114,7 @@ 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 */