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Thu, 7 Sep 2023 02:54:42 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas5p3.samsung.com (KnoxPortal) with ESMTPA id 20230906164407epcas5p3f9e9f33e15d7648fd1381cdfb97d11f2~CXPwsmNjD2437224372epcas5p3P; Wed, 6 Sep 2023 16:44:07 +0000 (GMT) Received: from epsmgmc1p1new.samsung.com (unknown [182.195.42.40]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20230906164407epsmtrp2f91c203a03d2021346bd345f74f3b2ca~CXPwrnkUM1133211332epsmtrp2r; Wed, 6 Sep 2023 16:44:07 +0000 (GMT) X-AuditID: b6c32a4a-6d5ff700000025a6-78-64f8bce2f611 Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgmc1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id 92.86.08649.75CA8F46; Thu, 7 Sep 2023 01:44:07 +0900 (KST) Received: from green245.sa.corp.samsungelectronics.net (unknown [107.99.41.245]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20230906164405epsmtip20dd79d5f98a452b252d16cf2b4372005~CXPuHE-T40127201272epsmtip2g; Wed, 6 Sep 2023 16:44:05 +0000 (GMT) From: Nitesh Shetty To: Jens Axboe , Jonathan Corbet , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Keith Busch , Christoph Hellwig , Sagi Grimberg , Chaitanya Kulkarni , Alexander Viro , Christian Brauner Cc: martin.petersen@oracle.com, mcgrof@kernel.org, gost.dev@samsung.com, Nitesh Shetty , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v15 09/12] dm: Add support for copy offload Date: Wed, 6 Sep 2023 22:08:34 +0530 Message-Id: <20230906163844.18754-10-nj.shetty@samsung.com> X-Mailer: git-send-email 2.35.1.500.gb896f729e2 In-Reply-To: <20230906163844.18754-1-nj.shetty@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02Tf1DTZRzHfb7fL1+G57qvSPaMNNZI7oBjbMbgIcFMsb4K2i7u6vTqaMe+ Dg7Y1n5AmHdMFwWogPnjjlGCbCcwUoyQSFjBEKeg8WPxs1MKRmnATFdAEdnmRvnf6/1+ns/n 83w+z/Ow8MAHZDArU65hVHJJNo9cTbR0hYdHTbYvSgV3ftiCGnuu4ajhdhmJZroeAuTo+Bgg i7PSD411fI2h+oZuDH1iHQZoesiAIct4JDr3kYlA7ZYbBLJf+ZREVeen/VGt7R8MjZZPA9Sy VIWjizP3CXR9/FnUt2zz2xZE9935gqDtt7R0k7mYpL80FdBtYzqSNpae9KOP650k/WB6nKDv fzNE0qXNZkC7mp6jmxxzmHjN/qyEDEYiZVRcRp6ukGbKZYm85NS0HWmiWIEwShiP4nhcuSSH SeQlpYijXs3MdrfJ4+ZKsrVuSyxRq3nRWxNUCq2G4WYo1JpEHqOUZitjlHy1JEetlcv4ckbz klAg2Cxyb3w3K0PXPQSUVznvOxdHgA78HFQCAliQioGmok6yBKxmBVJtAP7dVusTDwEs+3PO zyvmARxcqPJbCalpqfEtWAD8w1FCeEUhBk311W7BYpFUJOx9xPL4QZQOh5fajMAjcKoYg71L vaQn1TpqC5xrb3/MBLUJHu13Yp5gttvXW/I9CKloWDax1rMjwO0eOTwAPMym1sIbFQ7CwzgV AvWXK3FPekjpA+DNMZvvpEmwqK6f8PI6+Kut2d/LwdDltJBezoP1p+pIb/CHABpGDMC78DIs 7CnDPYfAqXDYeCXaa2+Ep3suYt7CT8HjSw7M67Nh69kVDoWfN1b78nPg8MJhH9PQuPC9b1il 7snN2/3LAdfwREOGJxoy/F+6GuBmwGGU6hwZoxYpN8uZvP+uOV2R0wQev/2I3a3gpx9/41sB xgJWAFk4L4jtDJmXBrKlkvyDjEqRptJmM2orELnnfQIPfjpd4f48ck2aMCZeEBMbGxsT/2Ks kPcMe6bwM2kgJZNomCyGUTKqlTiMFRCsw4615b/17U3XmXwVNjE8NvmOaVAjMs92JlekpJrO mUO+Ex/gNGXtnEpaHFhltx9yvJB7stjmSoyOvMa/PHAKn2oOORQWlucU6veM1h4Qc1SzV110 Kj0Kp02tnGNZb/e8UjjqEn1Vt7F/VfTW1/aZtjuKyv0t4iMJ681pBXot5xejcajy7vb5DYP3 mOG/imuSTzQU2Tpt+cuhayY32MnegF2D2/gpGaGhYu3BsAuaD+re2Oc8P/H8/ppc5lZpxG6z NXRCsKd4r67ielzXhXvc9PXdVtnY3ZG+KZHy0t5Nr3OXct7TOvh1nDeNrlnTUZ0sDhf8fjqh IOzRzNkdHabbRQvLPEKdIRFG4Cq15F9lcJJohAQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrGIsWRmVeSWpSXmKPExsWy7bCSvG74mh8pBv/nmFisP3WM2WL13X42 i9eHPzFaPDnQzmix991sVoubB3YyWaxcfZTJYtKha4wWT6/OYrLYe0vbYmHbEhaLPXtPslhc 3jWHzWL+sqfsFsuP/2OyuDHhKaPFtt/zmS3WvX7PYnHilrTF+b/HWR1EPM7f28jicflsqcem VZ1sHpuX1HvsvtnA5rG4bzKrR2/zOzaPj09vsXi833eVzaNvyypGj8+b5Dw2PXnLFMATxWWT kpqTWZZapG+XwJXRcPQqY8ERyYp3P64zNjA+E+li5OSQEDCRWLRtEWsXIxeHkMBuRonZm58y QSQkJZb9PcIMYQtLrPz3nB2iqJlJ4s/iP0AJDg42AW2J0/85QOIiAl3MEp0737GAOMwCk5kk Vp1fygLSLSxgLfF2zx42EJtFQFWi+8I7JpBmXqB4895KEFNCQF+i/74gSAUnULSp8SIjiC0k YCVxZ9VrMJtXQFDi5MwnYBOZBeQlmrfOZp7AKDALSWoWktQCRqZVjJKpBcW56bnJhgWGeanl esWJucWleel6yfm5mxjBUamlsYPx3vx/eocYmTgYDzFKcDArifC+k/+WIsSbklhZlVqUH19U mpNafIhRmoNFSZzXcMbsFCGB9MSS1OzU1ILUIpgsEwenVAPT0gkH3gpIrzHIjI36MSXrdeSH dStef42faJPyfhe/5jbeTTsms50+am+448GdVcyFj46EfVVNnCqak5MTbxd5L7zp1fuw+dtC T07++DU1kefn5Lu+JUcendwjvv2X505NthrenG+u9aIr/RhP11t/6rhedvDwogWy9985t2T0 P6l1rlG3cGje4uf844zHGt2zMtlHX647ZCtnzeIuN01j1z/Nj9NfRU1j2H8+wkTMTKf17dSW qyF9bF9CdonOOb2mn2fy5sOPbC4nhQid3yWhdOryw+VfF0ce/HhtrePhBc1SvKGzedljrr+6 fTK16OgJz/KTJ0y+Ljx4Tcf11/t+zotV4tm/p6sG/i54Z+P2LViJpTgj0VCLuag4EQAQCbn8 OQMAAA== X-CMS-MailID: 20230906164407epcas5p3f9e9f33e15d7648fd1381cdfb97d11f2 X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230906164407epcas5p3f9e9f33e15d7648fd1381cdfb97d11f2 References: <20230906163844.18754-1-nj.shetty@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org 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 | 37 +++++++++++++++++++++++++++++++++++ drivers/md/dm.c | 7 +++++++ include/linux/device-mapper.h | 3 +++ 3 files changed, 47 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 7d208b2b1a19..a192c19b68e4 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1862,6 +1862,38 @@ 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 !q->limits.max_copy_sectors; +} + +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) { @@ -1944,6 +1976,11 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, q->limits.discard_misaligned = 0; } + if (!dm_table_supports_copy(t)) { + q->limits.max_copy_sectors = 0; + q->limits.max_copy_hw_sectors = 0; + } + 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 f0f118ab20fa..f9d6215e6d4d 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1732,6 +1732,13 @@ 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 69d0435c7ebb..98db52d1c773 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -396,6 +396,9 @@ 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);