1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2020 Western Digital Corporation or its affiliates.
4  */
5 
6 #include <linux/blkdev.h>
7 #include <linux/vmalloc.h>
8 #include "nvme.h"
9 
nvme_set_max_append(struct nvme_ctrl * ctrl)10 static int nvme_set_max_append(struct nvme_ctrl *ctrl)
11 {
12 	struct nvme_command c = { };
13 	struct nvme_id_ctrl_zns *id;
14 	int status;
15 
16 	id = kzalloc(sizeof(*id), GFP_KERNEL);
17 	if (!id)
18 		return -ENOMEM;
19 
20 	c.identify.opcode = nvme_admin_identify;
21 	c.identify.cns = NVME_ID_CNS_CS_CTRL;
22 	c.identify.csi = NVME_CSI_ZNS;
23 
24 	status = nvme_submit_sync_cmd(ctrl->admin_q, &c, id, sizeof(*id));
25 	if (status) {
26 		kfree(id);
27 		return status;
28 	}
29 
30 	if (id->zasl)
31 		ctrl->max_zone_append = 1 << (id->zasl + 3);
32 	else
33 		ctrl->max_zone_append = ctrl->max_hw_sectors;
34 	kfree(id);
35 	return 0;
36 }
37 
nvme_query_zone_info(struct nvme_ns * ns,unsigned lbaf,struct nvme_zone_info * zi)38 int nvme_query_zone_info(struct nvme_ns *ns, unsigned lbaf,
39 		struct nvme_zone_info *zi)
40 {
41 	struct nvme_effects_log *log = ns->head->effects;
42 	struct nvme_command c = { };
43 	struct nvme_id_ns_zns *id;
44 	int status;
45 
46 	/* Driver requires zone append support */
47 	if ((le32_to_cpu(log->iocs[nvme_cmd_zone_append]) &
48 			NVME_CMD_EFFECTS_CSUPP)) {
49 		if (test_and_clear_bit(NVME_NS_FORCE_RO, &ns->flags))
50 			dev_warn(ns->ctrl->device,
51 				 "Zone Append supported for zoned namespace:%d. Remove read-only mode\n",
52 				 ns->head->ns_id);
53 	} else {
54 		set_bit(NVME_NS_FORCE_RO, &ns->flags);
55 		dev_warn(ns->ctrl->device,
56 			 "Zone Append not supported for zoned namespace:%d. Forcing to read-only mode\n",
57 			 ns->head->ns_id);
58 	}
59 
60 	/* Lazily query controller append limit for the first zoned namespace */
61 	if (!ns->ctrl->max_zone_append) {
62 		status = nvme_set_max_append(ns->ctrl);
63 		if (status)
64 			return status;
65 	}
66 
67 	id = kzalloc(sizeof(*id), GFP_KERNEL);
68 	if (!id)
69 		return -ENOMEM;
70 
71 	c.identify.opcode = nvme_admin_identify;
72 	c.identify.nsid = cpu_to_le32(ns->head->ns_id);
73 	c.identify.cns = NVME_ID_CNS_CS_NS;
74 	c.identify.csi = NVME_CSI_ZNS;
75 
76 	status = nvme_submit_sync_cmd(ns->ctrl->admin_q, &c, id, sizeof(*id));
77 	if (status)
78 		goto free_data;
79 
80 	/*
81 	 * We currently do not handle devices requiring any of the zoned
82 	 * operation characteristics.
83 	 */
84 	if (id->zoc) {
85 		dev_warn(ns->ctrl->device,
86 			"zone operations:%x not supported for namespace:%u\n",
87 			le16_to_cpu(id->zoc), ns->head->ns_id);
88 		status = -ENODEV;
89 		goto free_data;
90 	}
91 
92 	zi->zone_size = le64_to_cpu(id->lbafe[lbaf].zsze);
93 	if (!is_power_of_2(zi->zone_size)) {
94 		dev_warn(ns->ctrl->device,
95 			"invalid zone size: %llu for namespace: %u\n",
96 			zi->zone_size, ns->head->ns_id);
97 		status = -ENODEV;
98 		goto free_data;
99 	}
100 	zi->max_open_zones = le32_to_cpu(id->mor) + 1;
101 	zi->max_active_zones = le32_to_cpu(id->mar) + 1;
102 
103 free_data:
104 	kfree(id);
105 	return status;
106 }
107 
nvme_update_zone_info(struct nvme_ns * ns,struct queue_limits * lim,struct nvme_zone_info * zi)108 void nvme_update_zone_info(struct nvme_ns *ns, struct queue_limits *lim,
109 		struct nvme_zone_info *zi)
110 {
111 	lim->features |= BLK_FEAT_ZONED;
112 	lim->max_open_zones = zi->max_open_zones;
113 	lim->max_active_zones = zi->max_active_zones;
114 	lim->max_hw_zone_append_sectors = ns->ctrl->max_zone_append;
115 	lim->chunk_sectors = ns->head->zsze =
116 		nvme_lba_to_sect(ns->head, zi->zone_size);
117 }
118 
nvme_zns_alloc_report_buffer(struct nvme_ns * ns,unsigned int nr_zones,size_t * buflen)119 static void *nvme_zns_alloc_report_buffer(struct nvme_ns *ns,
120 					  unsigned int nr_zones, size_t *buflen)
121 {
122 	struct request_queue *q = ns->disk->queue;
123 	size_t bufsize;
124 	void *buf;
125 
126 	const size_t min_bufsize = sizeof(struct nvme_zone_report) +
127 				   sizeof(struct nvme_zone_descriptor);
128 
129 	nr_zones = min_t(unsigned int, nr_zones,
130 			 get_capacity(ns->disk) >> ilog2(ns->head->zsze));
131 
132 	bufsize = sizeof(struct nvme_zone_report) +
133 		nr_zones * sizeof(struct nvme_zone_descriptor);
134 	bufsize = min_t(size_t, bufsize,
135 			queue_max_hw_sectors(q) << SECTOR_SHIFT);
136 	bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
137 
138 	while (bufsize >= min_bufsize) {
139 		buf = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
140 		if (buf) {
141 			*buflen = bufsize;
142 			return buf;
143 		}
144 		bufsize >>= 1;
145 	}
146 	return NULL;
147 }
148 
nvme_zone_parse_entry(struct nvme_ctrl * ctrl,struct nvme_ns_head * head,struct nvme_zone_descriptor * entry,unsigned int idx,report_zones_cb cb,void * data)149 static int nvme_zone_parse_entry(struct nvme_ctrl *ctrl,
150 				 struct nvme_ns_head *head,
151 				 struct nvme_zone_descriptor *entry,
152 				 unsigned int idx, report_zones_cb cb,
153 				 void *data)
154 {
155 	struct blk_zone zone = { };
156 
157 	if ((entry->zt & 0xf) != NVME_ZONE_TYPE_SEQWRITE_REQ) {
158 		dev_err(ctrl->device, "invalid zone type %#x\n",
159 				entry->zt);
160 		return -EINVAL;
161 	}
162 
163 	zone.type = BLK_ZONE_TYPE_SEQWRITE_REQ;
164 	zone.cond = entry->zs >> 4;
165 	zone.len = head->zsze;
166 	zone.capacity = nvme_lba_to_sect(head, le64_to_cpu(entry->zcap));
167 	zone.start = nvme_lba_to_sect(head, le64_to_cpu(entry->zslba));
168 	if (zone.cond == BLK_ZONE_COND_FULL)
169 		zone.wp = zone.start + zone.len;
170 	else
171 		zone.wp = nvme_lba_to_sect(head, le64_to_cpu(entry->wp));
172 
173 	return cb(&zone, idx, data);
174 }
175 
nvme_ns_report_zones(struct nvme_ns * ns,sector_t sector,unsigned int nr_zones,report_zones_cb cb,void * data)176 int nvme_ns_report_zones(struct nvme_ns *ns, sector_t sector,
177 		unsigned int nr_zones, report_zones_cb cb, void *data)
178 {
179 	struct nvme_zone_report *report;
180 	struct nvme_command c = { };
181 	int ret, zone_idx = 0;
182 	unsigned int nz, i;
183 	size_t buflen;
184 
185 	if (ns->head->ids.csi != NVME_CSI_ZNS)
186 		return -EINVAL;
187 
188 	report = nvme_zns_alloc_report_buffer(ns, nr_zones, &buflen);
189 	if (!report)
190 		return -ENOMEM;
191 
192 	c.zmr.opcode = nvme_cmd_zone_mgmt_recv;
193 	c.zmr.nsid = cpu_to_le32(ns->head->ns_id);
194 	c.zmr.numd = cpu_to_le32(nvme_bytes_to_numd(buflen));
195 	c.zmr.zra = NVME_ZRA_ZONE_REPORT;
196 	c.zmr.zrasf = NVME_ZRASF_ZONE_REPORT_ALL;
197 	c.zmr.pr = NVME_REPORT_ZONE_PARTIAL;
198 
199 	sector &= ~(ns->head->zsze - 1);
200 	while (zone_idx < nr_zones && sector < get_capacity(ns->disk)) {
201 		memset(report, 0, buflen);
202 
203 		c.zmr.slba = cpu_to_le64(nvme_sect_to_lba(ns->head, sector));
204 		ret = nvme_submit_sync_cmd(ns->queue, &c, report, buflen);
205 		if (ret) {
206 			if (ret > 0)
207 				ret = -EIO;
208 			goto out_free;
209 		}
210 
211 		nz = min((unsigned int)le64_to_cpu(report->nr_zones), nr_zones);
212 		if (!nz)
213 			break;
214 
215 		for (i = 0; i < nz && zone_idx < nr_zones; i++) {
216 			ret = nvme_zone_parse_entry(ns->ctrl, ns->head,
217 						    &report->entries[i],
218 						    zone_idx, cb, data);
219 			if (ret)
220 				goto out_free;
221 			zone_idx++;
222 		}
223 
224 		sector += ns->head->zsze * nz;
225 	}
226 
227 	if (zone_idx > 0)
228 		ret = zone_idx;
229 	else
230 		ret = -EINVAL;
231 out_free:
232 	kvfree(report);
233 	return ret;
234 }
235 
nvme_setup_zone_mgmt_send(struct nvme_ns * ns,struct request * req,struct nvme_command * c,enum nvme_zone_mgmt_action action)236 blk_status_t nvme_setup_zone_mgmt_send(struct nvme_ns *ns, struct request *req,
237 		struct nvme_command *c, enum nvme_zone_mgmt_action action)
238 {
239 	memset(c, 0, sizeof(*c));
240 
241 	c->zms.opcode = nvme_cmd_zone_mgmt_send;
242 	c->zms.nsid = cpu_to_le32(ns->head->ns_id);
243 	c->zms.slba = cpu_to_le64(nvme_sect_to_lba(ns->head, blk_rq_pos(req)));
244 	c->zms.zsa = action;
245 
246 	if (req_op(req) == REQ_OP_ZONE_RESET_ALL)
247 		c->zms.select_all = 1;
248 
249 	return BLK_STS_OK;
250 }
251