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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c 
 kernel/drivers/nvme/target/io-cmd-bdev.c
....@@ -1,20 +1,67 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
23  * NVMe I/O command implementation.
34  * Copyright (c) 2015-2016 HGST, a Western Digital Company.
4
- *
5
- * This program is free software; you can redistribute it and/or modify it
6
- * under the terms and conditions of the GNU General Public License,
7
- * version 2, as published by the Free Software Foundation.
8
- *
9
- * This program is distributed in the hope it will be useful, but WITHOUT
10
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12
- * more details.
135  */
146 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
157 #include <linux/blkdev.h>
168 #include <linux/module.h>
179 #include "nvmet.h"
10
+
11
+void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id)
12
+{
13
+	const struct queue_limits *ql = &bdev_get_queue(bdev)->limits;
14
+	/* Number of logical blocks per physical block. */
15
+	const u32 lpp = ql->physical_block_size / ql->logical_block_size;
16
+	/* Logical blocks per physical block, 0's based. */
17
+	const __le16 lpp0b = to0based(lpp);
18
+
19
+	/*
20
+	 * For NVMe 1.2 and later, bit 1 indicates that the fields NAWUN,
21
+	 * NAWUPF, and NACWU are defined for this namespace and should be
22
+	 * used by the host for this namespace instead of the AWUN, AWUPF,
23
+	 * and ACWU fields in the Identify Controller data structure. If
24
+	 * any of these fields are zero that means that the corresponding
25
+	 * field from the identify controller data structure should be used.
26
+	 */
27
+	id->nsfeat |= 1 << 1;
28
+	id->nawun = lpp0b;
29
+	id->nawupf = lpp0b;
30
+	id->nacwu = lpp0b;
31
+
32
+	/*
33
+	 * Bit 4 indicates that the fields NPWG, NPWA, NPDG, NPDA, and
34
+	 * NOWS are defined for this namespace and should be used by
35
+	 * the host for I/O optimization.
36
+	 */
37
+	id->nsfeat |= 1 << 4;
38
+	/* NPWG = Namespace Preferred Write Granularity. 0's based */
39
+	id->npwg = lpp0b;
40
+	/* NPWA = Namespace Preferred Write Alignment. 0's based */
41
+	id->npwa = id->npwg;
42
+	/* NPDG = Namespace Preferred Deallocate Granularity. 0's based */
43
+	id->npdg = to0based(ql->discard_granularity / ql->logical_block_size);
44
+	/* NPDG = Namespace Preferred Deallocate Alignment */
45
+	id->npda = id->npdg;
46
+	/* NOWS = Namespace Optimal Write Size */
47
+	id->nows = to0based(ql->io_opt / ql->logical_block_size);
48
+}
49
+
50
+static void nvmet_bdev_ns_enable_integrity(struct nvmet_ns *ns)
51
+{
52
+	struct blk_integrity *bi = bdev_get_integrity(ns->bdev);
53
+
54
+	if (bi) {
55
+		ns->metadata_size = bi->tuple_size;
56
+		if (bi->profile == &t10_pi_type1_crc)
57
+			ns->pi_type = NVME_NS_DPS_PI_TYPE1;
58
+		else if (bi->profile == &t10_pi_type3_crc)
59
+			ns->pi_type = NVME_NS_DPS_PI_TYPE3;
60
+		else
61
+			/* Unsupported metadata type */
62
+			ns->metadata_size = 0;
63
+	}
64
+}
1865 
1966 int nvmet_bdev_ns_enable(struct nvmet_ns *ns)
2067 {
....@@ -33,6 +80,12 @@
3380 	}
3481 	ns->size = i_size_read(ns->bdev->bd_inode);
3582 	ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
83
+
84
+	ns->pi_type = 0;
85
+	ns->metadata_size = 0;
86
+	if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY_T10))
87
+		nvmet_bdev_ns_enable_integrity(ns);
88
+
3689 	return 0;
3790 }
3891 
....@@ -44,25 +97,146 @@
4497 	}
4598 }
4699 
100
+void nvmet_bdev_ns_revalidate(struct nvmet_ns *ns)
101
+{
102
+	ns->size = i_size_read(ns->bdev->bd_inode);
103
+}
104
+
105
+static u16 blk_to_nvme_status(struct nvmet_req *req, blk_status_t blk_sts)
106
+{
107
+	u16 status = NVME_SC_SUCCESS;
108
+
109
+	if (likely(blk_sts == BLK_STS_OK))
110
+		return status;
111
+	/*
112
+	 * Right now there exists M : 1 mapping between block layer error
113
+	 * to the NVMe status code (see nvme_error_status()). For consistency,
114
+	 * when we reverse map we use most appropriate NVMe Status code from
115
+	 * the group of the NVMe staus codes used in the nvme_error_status().
116
+	 */
117
+	switch (blk_sts) {
118
+	case BLK_STS_NOSPC:
119
+		status = NVME_SC_CAP_EXCEEDED | NVME_SC_DNR;
120
+		req->error_loc = offsetof(struct nvme_rw_command, length);
121
+		break;
122
+	case BLK_STS_TARGET:
123
+		status = NVME_SC_LBA_RANGE | NVME_SC_DNR;
124
+		req->error_loc = offsetof(struct nvme_rw_command, slba);
125
+		break;
126
+	case BLK_STS_NOTSUPP:
127
+		req->error_loc = offsetof(struct nvme_common_command, opcode);
128
+		switch (req->cmd->common.opcode) {
129
+		case nvme_cmd_dsm:
130
+		case nvme_cmd_write_zeroes:
131
+			status = NVME_SC_ONCS_NOT_SUPPORTED | NVME_SC_DNR;
132
+			break;
133
+		default:
134
+			status = NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
135
+		}
136
+		break;
137
+	case BLK_STS_MEDIUM:
138
+		status = NVME_SC_ACCESS_DENIED;
139
+		req->error_loc = offsetof(struct nvme_rw_command, nsid);
140
+		break;
141
+	case BLK_STS_IOERR:
142
+	default:
143
+		status = NVME_SC_INTERNAL | NVME_SC_DNR;
144
+		req->error_loc = offsetof(struct nvme_common_command, opcode);
145
+	}
146
+
147
+	switch (req->cmd->common.opcode) {
148
+	case nvme_cmd_read:
149
+	case nvme_cmd_write:
150
+		req->error_slba = le64_to_cpu(req->cmd->rw.slba);
151
+		break;
152
+	case nvme_cmd_write_zeroes:
153
+		req->error_slba =
154
+			le64_to_cpu(req->cmd->write_zeroes.slba);
155
+		break;
156
+	default:
157
+		req->error_slba = 0;
158
+	}
159
+	return status;
160
+}
161
+
47162 static void nvmet_bio_done(struct bio *bio)
48163 {
49164 	struct nvmet_req *req = bio->bi_private;
50165 
51
-	nvmet_req_complete(req,
52
-		bio->bi_status ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
53
-
166
+	nvmet_req_complete(req, blk_to_nvme_status(req, bio->bi_status));
54167 	if (bio != &req->b.inline_bio)
55168 		bio_put(bio);
56169 }
57170 
171
+#ifdef CONFIG_BLK_DEV_INTEGRITY
172
+static int nvmet_bdev_alloc_bip(struct nvmet_req *req, struct bio *bio,
173
+				struct sg_mapping_iter *miter)
174
+{
175
+	struct blk_integrity *bi;
176
+	struct bio_integrity_payload *bip;
177
+	struct block_device *bdev = req->ns->bdev;
178
+	int rc;
179
+	size_t resid, len;
180
+
181
+	bi = bdev_get_integrity(bdev);
182
+	if (unlikely(!bi)) {
183
+		pr_err("Unable to locate bio_integrity\n");
184
+		return -ENODEV;
185
+	}
186
+
187
+	bip = bio_integrity_alloc(bio, GFP_NOIO,
188
+		min_t(unsigned int, req->metadata_sg_cnt, BIO_MAX_PAGES));
189
+	if (IS_ERR(bip)) {
190
+		pr_err("Unable to allocate bio_integrity_payload\n");
191
+		return PTR_ERR(bip);
192
+	}
193
+
194
+	bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio));
195
+	/* virtual start sector must be in integrity interval units */
196
+	bip_set_seed(bip, bio->bi_iter.bi_sector >>
197
+		     (bi->interval_exp - SECTOR_SHIFT));
198
+
199
+	resid = bip->bip_iter.bi_size;
200
+	while (resid > 0 && sg_miter_next(miter)) {
201
+		len = min_t(size_t, miter->length, resid);
202
+		rc = bio_integrity_add_page(bio, miter->page, len,
203
+					    offset_in_page(miter->addr));
204
+		if (unlikely(rc != len)) {
205
+			pr_err("bio_integrity_add_page() failed; %d\n", rc);
206
+			sg_miter_stop(miter);
207
+			return -ENOMEM;
208
+		}
209
+
210
+		resid -= len;
211
+		if (len < miter->length)
212
+			miter->consumed -= miter->length - len;
213
+	}
214
+	sg_miter_stop(miter);
215
+
216
+	return 0;
217
+}
218
+#else
219
+static int nvmet_bdev_alloc_bip(struct nvmet_req *req, struct bio *bio,
220
+				struct sg_mapping_iter *miter)
221
+{
222
+	return -EINVAL;
223
+}
224
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
225
+
58226 static void nvmet_bdev_execute_rw(struct nvmet_req *req)
59227 {
60228 	int sg_cnt = req->sg_cnt;
61
-	struct bio *bio = &req->b.inline_bio;
229
+	struct bio *bio;
62230 	struct scatterlist *sg;
231
+	struct blk_plug plug;
63232 	sector_t sector;
64
-	blk_qc_t cookie;
65
-	int op, op_flags = 0, i;
233
+	int op, i, rc;
234
+	struct sg_mapping_iter prot_miter;
235
+	unsigned int iter_flags;
236
+	unsigned int total_len = nvmet_rw_data_len(req) + req->metadata_len;
237
+
238
+	if (!nvmet_check_transfer_len(req, total_len))
239
+		return;
66240 
67241 	if (!req->sg_cnt) {
68242 		nvmet_req_complete(req, 0);
....@@ -70,33 +244,55 @@
70244 	}
71245 
72246 	if (req->cmd->rw.opcode == nvme_cmd_write) {
73
-		op = REQ_OP_WRITE;
74
-		op_flags = REQ_SYNC | REQ_IDLE;
247
+		op = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE;
75248 		if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
76
-			op_flags |= REQ_FUA;
249
+			op |= REQ_FUA;
250
+		iter_flags = SG_MITER_TO_SG;
77251 	} else {
78252 		op = REQ_OP_READ;
253
+		iter_flags = SG_MITER_FROM_SG;
79254 	}
80255 
81
-	sector = le64_to_cpu(req->cmd->rw.slba);
82
-	sector <<= (req->ns->blksize_shift - 9);
256
+	if (is_pci_p2pdma_page(sg_page(req->sg)))
257
+		op |= REQ_NOMERGE;
83258 
84
-	bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
259
+	sector = nvmet_lba_to_sect(req->ns, req->cmd->rw.slba);
260
+
261
+	if (nvmet_use_inline_bvec(req)) {
262
+		bio = &req->b.inline_bio;
263
+		bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
264
+	} else {
265
+		bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
266
+	}
85267 	bio_set_dev(bio, req->ns->bdev);
86268 	bio->bi_iter.bi_sector = sector;
87269 	bio->bi_private = req;
88270 	bio->bi_end_io = nvmet_bio_done;
89
-	bio_set_op_attrs(bio, op, op_flags);
271
+	bio->bi_opf = op;
272
+
273
+	blk_start_plug(&plug);
274
+	if (req->metadata_len)
275
+		sg_miter_start(&prot_miter, req->metadata_sg,
276
+			       req->metadata_sg_cnt, iter_flags);
90277 
91278 	for_each_sg(req->sg, sg, req->sg_cnt, i) {
92279 		while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
93280 				!= sg->length) {
94281 			struct bio *prev = bio;
95282 
283
+			if (req->metadata_len) {
284
+				rc = nvmet_bdev_alloc_bip(req, bio,
285
+							  &prot_miter);
286
+				if (unlikely(rc)) {
287
+					bio_io_error(bio);
288
+					return;
289
+				}
290
+			}
291
+
96292 			bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
97293 			bio_set_dev(bio, req->ns->bdev);
98294 			bio->bi_iter.bi_sector = sector;
99
-			bio_set_op_attrs(bio, op, op_flags);
295
+			bio->bi_opf = op;
100296 
101297 			bio_chain(bio, prev);
102298 			submit_bio(prev);
....@@ -106,14 +302,24 @@
106302 		sg_cnt--;
107303 	}
108304 
109
-	cookie = submit_bio(bio);
305
+	if (req->metadata_len) {
306
+		rc = nvmet_bdev_alloc_bip(req, bio, &prot_miter);
307
+		if (unlikely(rc)) {
308
+			bio_io_error(bio);
309
+			return;
310
+		}
311
+	}
110312 
111
-	blk_poll(bdev_get_queue(req->ns->bdev), cookie);
313
+	submit_bio(bio);
314
+	blk_finish_plug(&plug);
112315 }
113316 
114317 static void nvmet_bdev_execute_flush(struct nvmet_req *req)
115318 {
116319 	struct bio *bio = &req->b.inline_bio;
320
+
321
+	if (!nvmet_check_transfer_len(req, 0))
322
+		return;
117323 
118324 	bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
119325 	bio_set_dev(bio, req->ns->bdev);
....@@ -126,23 +332,26 @@
126332 
127333 u16 nvmet_bdev_flush(struct nvmet_req *req)
128334 {
129
-	if (blkdev_issue_flush(req->ns->bdev, GFP_KERNEL, NULL))
335
+	if (blkdev_issue_flush(req->ns->bdev, GFP_KERNEL))
130336 		return NVME_SC_INTERNAL | NVME_SC_DNR;
131337 	return 0;
132338 }
133339 
134
-static u16 nvmet_bdev_discard_range(struct nvmet_ns *ns,
340
+static u16 nvmet_bdev_discard_range(struct nvmet_req *req,
135341 		struct nvme_dsm_range *range, struct bio **bio)
136342 {
343
+	struct nvmet_ns *ns = req->ns;
137344 	int ret;
138345 
139346 	ret = __blkdev_issue_discard(ns->bdev,
140
-			le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
347
+			nvmet_lba_to_sect(ns, range->slba),
141348 			le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
142349 			GFP_KERNEL, 0, bio);
143
-	if (ret && ret != -EOPNOTSUPP)
144
-		return NVME_SC_INTERNAL | NVME_SC_DNR;
145
-	return 0;
350
+	if (ret && ret != -EOPNOTSUPP) {
351
+		req->error_slba = le64_to_cpu(range->slba);
352
+		return errno_to_nvme_status(req, ret);
353
+	}
354
+	return NVME_SC_SUCCESS;
146355 }
147356 
148357 static void nvmet_bdev_execute_discard(struct nvmet_req *req)
....@@ -158,7 +367,7 @@
158367 		if (status)
159368 			break;
160369 
161
-		status = nvmet_bdev_discard_range(req->ns, &range, &bio);
370
+		status = nvmet_bdev_discard_range(req, &range, &bio);
162371 		if (status)
163372 			break;
164373 	}
....@@ -166,12 +375,10 @@
166375 	if (bio) {
167376 		bio->bi_private = req;
168377 		bio->bi_end_io = nvmet_bio_done;
169
-		if (status) {
170
-			bio->bi_status = BLK_STS_IOERR;
171
-			bio_endio(bio);
172
-		} else {
378
+		if (status)
379
+			bio_io_error(bio);
380
+		else
173381 			submit_bio(bio);
174
-		}
175382 	} else {
176383 		nvmet_req_complete(req, status);
177384 	}
....@@ -179,6 +386,9 @@
179386 
180387 static void nvmet_bdev_execute_dsm(struct nvmet_req *req)
181388 {
389
+	if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
390
+		return;
391
+
182392 	switch (le32_to_cpu(req->cmd->dsm.attributes)) {
183393 	case NVME_DSMGMT_AD:
184394 		nvmet_bdev_execute_discard(req);
....@@ -196,25 +406,25 @@
196406 {
197407 	struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
198408 	struct bio *bio = NULL;
199
-	u16 status = NVME_SC_SUCCESS;
200409 	sector_t sector;
201410 	sector_t nr_sector;
411
+	int ret;
202412 
203
-	sector = le64_to_cpu(write_zeroes->slba) <<
204
-		(req->ns->blksize_shift - 9);
413
+	if (!nvmet_check_transfer_len(req, 0))
414
+		return;
415
+
416
+	sector = nvmet_lba_to_sect(req->ns, write_zeroes->slba);
205417 	nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
206418 		(req->ns->blksize_shift - 9));
207419 
208
-	if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
209
-				GFP_KERNEL, &bio, 0))
210
-		status = NVME_SC_INTERNAL | NVME_SC_DNR;
211
-
420
+	ret = __blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
421
+			GFP_KERNEL, &bio, 0);
212422 	if (bio) {
213423 		bio->bi_private = req;
214424 		bio->bi_end_io = nvmet_bio_done;
215425 		submit_bio(bio);
216426 	} else {
217
-		nvmet_req_complete(req, status);
427
+		nvmet_req_complete(req, errno_to_nvme_status(req, ret));
218428 	}
219429 }
220430 
....@@ -226,24 +436,22 @@
226436 	case nvme_cmd_read:
227437 	case nvme_cmd_write:
228438 		req->execute = nvmet_bdev_execute_rw;
229
-		req->data_len = nvmet_rw_len(req);
439
+		if (req->sq->ctrl->pi_support && nvmet_ns_has_pi(req->ns))
440
+			req->metadata_len = nvmet_rw_metadata_len(req);
230441 		return 0;
231442 	case nvme_cmd_flush:
232443 		req->execute = nvmet_bdev_execute_flush;
233
-		req->data_len = 0;
234444 		return 0;
235445 	case nvme_cmd_dsm:
236446 		req->execute = nvmet_bdev_execute_dsm;
237
-		req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) *
238
-			sizeof(struct nvme_dsm_range);
239447 		return 0;
240448 	case nvme_cmd_write_zeroes:
241449 		req->execute = nvmet_bdev_execute_write_zeroes;
242
-		req->data_len = 0;
243450 		return 0;
244451 	default:
245452 		pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
246453 		       req->sq->qid);
454
+		req->error_loc = offsetof(struct nvme_common_command, opcode);
247455 		return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
248456 	}
249457 }