Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2020 Intel Corporation. All rights reserved.
3 : */
4 :
5 : /* VFIO transport extensions for spdk_nvme_ctrlr */
6 :
7 : #include "spdk/stdinc.h"
8 : #include "spdk/env.h"
9 : #include "spdk/likely.h"
10 : #include "spdk/string.h"
11 : #include "spdk/vfio_user_pci.h"
12 : #include "nvme_internal.h"
13 : #include "nvme_pcie_internal.h"
14 :
15 : #include <linux/vfio.h>
16 :
17 : #define NVME_MAX_XFER_SIZE (131072)
18 : #define NVME_MAX_SGES (1)
19 :
20 : struct nvme_vfio_ctrlr {
21 : struct nvme_pcie_ctrlr pctrlr;
22 :
23 : volatile uint32_t *doorbell_base;
24 : struct vfio_device *dev;
25 : };
26 :
27 : static inline struct nvme_vfio_ctrlr *
28 0 : nvme_vfio_ctrlr(struct spdk_nvme_ctrlr *ctrlr)
29 : {
30 0 : struct nvme_pcie_ctrlr *pctrlr = nvme_pcie_ctrlr(ctrlr);
31 :
32 0 : return SPDK_CONTAINEROF(pctrlr, struct nvme_vfio_ctrlr, pctrlr);
33 : }
34 :
35 : static volatile struct spdk_nvme_registers *
36 0 : nvme_vfio_ctrlr_get_registers(struct spdk_nvme_ctrlr *ctrlr)
37 : {
38 0 : struct nvme_vfio_ctrlr *vctrlr = nvme_vfio_ctrlr(ctrlr);
39 :
40 0 : return vctrlr->pctrlr.regs;
41 : }
42 :
43 : static int
44 0 : nvme_vfio_ctrlr_set_reg_4(struct spdk_nvme_ctrlr *ctrlr, uint32_t offset, uint32_t value)
45 : {
46 0 : struct nvme_vfio_ctrlr *vctrlr = nvme_vfio_ctrlr(ctrlr);
47 :
48 0 : assert(offset <= sizeof(struct spdk_nvme_registers) - 4);
49 0 : SPDK_DEBUGLOG(nvme_vfio, "ctrlr %s: offset 0x%x, value 0x%x\n", ctrlr->trid.traddr, offset, value);
50 :
51 0 : return spdk_vfio_user_pci_bar_access(vctrlr->dev, VFIO_PCI_BAR0_REGION_INDEX,
52 : offset, 4, &value, true);
53 : }
54 :
55 : static int
56 0 : nvme_vfio_ctrlr_set_reg_8(struct spdk_nvme_ctrlr *ctrlr, uint32_t offset, uint64_t value)
57 : {
58 0 : struct nvme_vfio_ctrlr *vctrlr = nvme_vfio_ctrlr(ctrlr);
59 :
60 0 : assert(offset <= sizeof(struct spdk_nvme_registers) - 8);
61 0 : SPDK_DEBUGLOG(nvme_vfio, "ctrlr %s: offset 0x%x, value 0x%"PRIx64"\n", ctrlr->trid.traddr, offset,
62 : value);
63 :
64 0 : return spdk_vfio_user_pci_bar_access(vctrlr->dev, VFIO_PCI_BAR0_REGION_INDEX,
65 : offset, 8, &value, true);
66 : }
67 :
68 : static int
69 0 : nvme_vfio_ctrlr_get_reg_4(struct spdk_nvme_ctrlr *ctrlr, uint32_t offset, uint32_t *value)
70 : {
71 0 : struct nvme_vfio_ctrlr *vctrlr = nvme_vfio_ctrlr(ctrlr);
72 : int ret;
73 :
74 0 : assert(offset <= sizeof(struct spdk_nvme_registers) - 4);
75 :
76 0 : ret = spdk_vfio_user_pci_bar_access(vctrlr->dev, VFIO_PCI_BAR0_REGION_INDEX,
77 : offset, 4, value, false);
78 0 : if (ret != 0) {
79 0 : SPDK_ERRLOG("ctrlr %p, offset %x\n", ctrlr, offset);
80 0 : return ret;
81 : }
82 :
83 0 : SPDK_DEBUGLOG(nvme_vfio, "ctrlr %s: offset 0x%x, value 0x%x\n", ctrlr->trid.traddr, offset, *value);
84 :
85 0 : return 0;
86 : }
87 :
88 : static int
89 0 : nvme_vfio_ctrlr_get_reg_8(struct spdk_nvme_ctrlr *ctrlr, uint32_t offset, uint64_t *value)
90 : {
91 0 : struct nvme_vfio_ctrlr *vctrlr = nvme_vfio_ctrlr(ctrlr);
92 : int ret;
93 :
94 0 : assert(offset <= sizeof(struct spdk_nvme_registers) - 8);
95 :
96 0 : ret = spdk_vfio_user_pci_bar_access(vctrlr->dev, VFIO_PCI_BAR0_REGION_INDEX,
97 : offset, 8, value, false);
98 0 : if (ret != 0) {
99 0 : SPDK_ERRLOG("ctrlr %p, offset %x\n", ctrlr, offset);
100 0 : return ret;
101 : }
102 :
103 0 : SPDK_DEBUGLOG(nvme_vfio, "ctrlr %s: offset 0x%x, value 0x%"PRIx64"\n", ctrlr->trid.traddr, offset,
104 : *value);
105 :
106 0 : return 0;
107 : }
108 :
109 : static int
110 0 : nvme_vfio_ctrlr_set_asq(struct spdk_nvme_ctrlr *ctrlr, uint64_t value)
111 : {
112 0 : return nvme_vfio_ctrlr_set_reg_8(ctrlr, offsetof(struct spdk_nvme_registers, asq),
113 : value);
114 : }
115 :
116 : static int
117 0 : nvme_vfio_ctrlr_set_acq(struct spdk_nvme_ctrlr *ctrlr, uint64_t value)
118 : {
119 0 : return nvme_vfio_ctrlr_set_reg_8(ctrlr, offsetof(struct spdk_nvme_registers, acq),
120 : value);
121 : }
122 :
123 : static int
124 0 : nvme_vfio_ctrlr_set_aqa(struct spdk_nvme_ctrlr *ctrlr, const union spdk_nvme_aqa_register *aqa)
125 : {
126 0 : return nvme_vfio_ctrlr_set_reg_4(ctrlr, offsetof(struct spdk_nvme_registers, aqa.raw),
127 0 : aqa->raw);
128 : }
129 :
130 : static int
131 0 : nvme_vfio_setup_bar0(struct nvme_vfio_ctrlr *vctrlr)
132 : {
133 : void *doorbell;
134 :
135 0 : doorbell = spdk_vfio_user_get_bar_addr(vctrlr->dev, 0, 0x1000, 0x1000);
136 0 : if (!doorbell) {
137 0 : return -EINVAL;
138 : }
139 :
140 0 : vctrlr->doorbell_base = (volatile uint32_t *)doorbell;
141 0 : return 0;
142 : }
143 :
144 : static struct spdk_nvme_ctrlr *
145 0 : nvme_vfio_ctrlr_construct(const struct spdk_nvme_transport_id *trid,
146 : const struct spdk_nvme_ctrlr_opts *opts,
147 : void *devhandle)
148 : {
149 : struct nvme_vfio_ctrlr *vctrlr;
150 : struct nvme_pcie_ctrlr *pctrlr;
151 0 : uint16_t cmd_reg;
152 0 : union spdk_nvme_cap_register cap;
153 : int ret;
154 0 : char ctrlr_path[PATH_MAX];
155 :
156 0 : snprintf(ctrlr_path, sizeof(ctrlr_path), "%s/cntrl", trid->traddr);
157 0 : ret = access(ctrlr_path, F_OK);
158 0 : if (ret != 0) {
159 0 : SPDK_ERRLOG("Access path %s failed\n", ctrlr_path);
160 0 : return NULL;
161 : }
162 :
163 0 : vctrlr = calloc(1, sizeof(*vctrlr));
164 0 : if (!vctrlr) {
165 0 : return NULL;
166 : }
167 :
168 0 : vctrlr->dev = spdk_vfio_user_setup(ctrlr_path);
169 0 : if (!vctrlr->dev) {
170 0 : SPDK_ERRLOG("Error to setup vfio device\n");
171 0 : free(vctrlr);
172 0 : return NULL;
173 : }
174 :
175 0 : ret = nvme_vfio_setup_bar0(vctrlr);
176 0 : if (ret != 0) {
177 0 : SPDK_ERRLOG("Error to get device BAR0\n");
178 0 : goto exit;
179 : }
180 :
181 0 : pctrlr = &vctrlr->pctrlr;
182 0 : pctrlr->doorbell_base = vctrlr->doorbell_base;
183 0 : pctrlr->ctrlr.is_removed = false;
184 0 : pctrlr->ctrlr.opts = *opts;
185 0 : pctrlr->ctrlr.trid = *trid;
186 0 : pctrlr->ctrlr.opts.use_cmb_sqs = false;
187 0 : pctrlr->ctrlr.opts.admin_queue_size = spdk_max(pctrlr->ctrlr.opts.admin_queue_size,
188 : NVME_PCIE_MIN_ADMIN_QUEUE_SIZE);
189 :
190 0 : ret = nvme_ctrlr_construct(&pctrlr->ctrlr);
191 0 : if (ret != 0) {
192 0 : goto exit;
193 : }
194 :
195 : /* Enable PCI busmaster and disable INTx */
196 0 : ret = spdk_vfio_user_pci_bar_access(vctrlr->dev, VFIO_PCI_CONFIG_REGION_INDEX, 4, 2,
197 : &cmd_reg, false);
198 0 : if (ret != 0) {
199 0 : nvme_ctrlr_destruct(&pctrlr->ctrlr);
200 0 : SPDK_ERRLOG("Read PCI CMD REG failed\n");
201 0 : goto exit;
202 : }
203 0 : cmd_reg |= 0x404;
204 0 : ret = spdk_vfio_user_pci_bar_access(vctrlr->dev, VFIO_PCI_CONFIG_REGION_INDEX, 4, 2,
205 : &cmd_reg, true);
206 0 : if (ret != 0) {
207 0 : nvme_ctrlr_destruct(&pctrlr->ctrlr);
208 0 : SPDK_ERRLOG("Write PCI CMD REG failed\n");
209 0 : goto exit;
210 : }
211 :
212 0 : if (nvme_ctrlr_get_cap(&pctrlr->ctrlr, &cap)) {
213 0 : nvme_ctrlr_destruct(&pctrlr->ctrlr);
214 0 : SPDK_ERRLOG("get_cap() failed\n");
215 0 : goto exit;
216 : }
217 :
218 : /* Doorbell stride is 2 ^ (dstrd + 2),
219 : * but we want multiples of 4, so drop the + 2 */
220 0 : pctrlr->doorbell_stride_u32 = 1 << cap.bits.dstrd;
221 :
222 0 : ret = nvme_pcie_ctrlr_construct_admin_qpair(&pctrlr->ctrlr, pctrlr->ctrlr.opts.admin_queue_size);
223 0 : if (ret != 0) {
224 0 : nvme_ctrlr_destruct(&pctrlr->ctrlr);
225 0 : goto exit;
226 : }
227 :
228 : /* Construct the primary process properties */
229 0 : ret = nvme_ctrlr_add_process(&pctrlr->ctrlr, 0);
230 0 : if (ret != 0) {
231 0 : nvme_ctrlr_destruct(&pctrlr->ctrlr);
232 0 : goto exit;
233 : }
234 :
235 0 : return &pctrlr->ctrlr;
236 :
237 0 : exit:
238 0 : spdk_vfio_user_release(vctrlr->dev);
239 0 : free(vctrlr);
240 0 : return NULL;
241 : }
242 :
243 : static int
244 0 : nvme_vfio_ctrlr_scan(struct spdk_nvme_probe_ctx *probe_ctx,
245 : bool direct_connect)
246 : {
247 : int ret;
248 :
249 0 : if (probe_ctx->trid.trtype != SPDK_NVME_TRANSPORT_VFIOUSER) {
250 0 : SPDK_ERRLOG("Can only use SPDK_NVME_TRANSPORT_VFIOUSER");
251 0 : return -EINVAL;
252 : }
253 :
254 0 : ret = access(probe_ctx->trid.traddr, F_OK);
255 0 : if (ret != 0) {
256 0 : SPDK_ERRLOG("Error to access file %s\n", probe_ctx->trid.traddr);
257 0 : return ret;
258 : }
259 0 : SPDK_DEBUGLOG(nvme_vfio, "Scan controller : %s\n", probe_ctx->trid.traddr);
260 :
261 0 : return nvme_ctrlr_probe(&probe_ctx->trid, probe_ctx, NULL);
262 : }
263 :
264 : static int
265 0 : nvme_vfio_ctrlr_enable(struct spdk_nvme_ctrlr *ctrlr)
266 : {
267 0 : struct nvme_pcie_qpair *vadminq = nvme_pcie_qpair(ctrlr->adminq);
268 0 : union spdk_nvme_aqa_register aqa;
269 :
270 0 : if (nvme_vfio_ctrlr_set_asq(ctrlr, vadminq->cmd_bus_addr)) {
271 0 : SPDK_ERRLOG("set_asq() failed\n");
272 0 : return -EIO;
273 : }
274 :
275 0 : if (nvme_vfio_ctrlr_set_acq(ctrlr, vadminq->cpl_bus_addr)) {
276 0 : SPDK_ERRLOG("set_acq() failed\n");
277 0 : return -EIO;
278 : }
279 :
280 0 : aqa.raw = 0;
281 : /* acqs and asqs are 0-based. */
282 0 : aqa.bits.acqs = nvme_pcie_qpair(ctrlr->adminq)->num_entries - 1;
283 0 : aqa.bits.asqs = nvme_pcie_qpair(ctrlr->adminq)->num_entries - 1;
284 :
285 0 : if (nvme_vfio_ctrlr_set_aqa(ctrlr, &aqa)) {
286 0 : SPDK_ERRLOG("set_aqa() failed\n");
287 0 : return -EIO;
288 : }
289 :
290 0 : return 0;
291 : }
292 :
293 : static int
294 0 : nvme_vfio_ctrlr_destruct(struct spdk_nvme_ctrlr *ctrlr)
295 : {
296 0 : struct nvme_vfio_ctrlr *vctrlr = nvme_vfio_ctrlr(ctrlr);
297 :
298 0 : if (ctrlr->adminq) {
299 0 : nvme_pcie_qpair_destroy(ctrlr->adminq);
300 : }
301 :
302 0 : nvme_ctrlr_destruct_finish(ctrlr);
303 :
304 0 : spdk_vfio_user_release(vctrlr->dev);
305 0 : free(vctrlr);
306 :
307 0 : return 0;
308 : }
309 :
310 : static uint32_t
311 0 : nvme_vfio_ctrlr_get_max_xfer_size(struct spdk_nvme_ctrlr *ctrlr)
312 : {
313 0 : return NVME_MAX_XFER_SIZE;
314 : }
315 :
316 : static uint16_t
317 0 : nvme_vfio_ctrlr_get_max_sges(struct spdk_nvme_ctrlr *ctrlr)
318 : {
319 0 : return NVME_MAX_SGES;
320 : }
321 :
322 : const struct spdk_nvme_transport_ops vfio_ops = {
323 : .name = "VFIOUSER",
324 : .type = SPDK_NVME_TRANSPORT_VFIOUSER,
325 : .ctrlr_construct = nvme_vfio_ctrlr_construct,
326 : .ctrlr_scan = nvme_vfio_ctrlr_scan,
327 : .ctrlr_destruct = nvme_vfio_ctrlr_destruct,
328 : .ctrlr_enable = nvme_vfio_ctrlr_enable,
329 :
330 : .ctrlr_get_registers = nvme_vfio_ctrlr_get_registers,
331 : .ctrlr_set_reg_4 = nvme_vfio_ctrlr_set_reg_4,
332 : .ctrlr_set_reg_8 = nvme_vfio_ctrlr_set_reg_8,
333 : .ctrlr_get_reg_4 = nvme_vfio_ctrlr_get_reg_4,
334 : .ctrlr_get_reg_8 = nvme_vfio_ctrlr_get_reg_8,
335 :
336 : .ctrlr_get_max_xfer_size = nvme_vfio_ctrlr_get_max_xfer_size,
337 : .ctrlr_get_max_sges = nvme_vfio_ctrlr_get_max_sges,
338 :
339 : .ctrlr_create_io_qpair = nvme_pcie_ctrlr_create_io_qpair,
340 : .ctrlr_delete_io_qpair = nvme_pcie_ctrlr_delete_io_qpair,
341 : .ctrlr_connect_qpair = nvme_pcie_ctrlr_connect_qpair,
342 : .ctrlr_disconnect_qpair = nvme_pcie_ctrlr_disconnect_qpair,
343 : .admin_qpair_abort_aers = nvme_pcie_admin_qpair_abort_aers,
344 :
345 : .qpair_reset = nvme_pcie_qpair_reset,
346 : .qpair_abort_reqs = nvme_pcie_qpair_abort_reqs,
347 : .qpair_submit_request = nvme_pcie_qpair_submit_request,
348 : .qpair_process_completions = nvme_pcie_qpair_process_completions,
349 :
350 : .poll_group_create = nvme_pcie_poll_group_create,
351 : .poll_group_connect_qpair = nvme_pcie_poll_group_connect_qpair,
352 : .poll_group_disconnect_qpair = nvme_pcie_poll_group_disconnect_qpair,
353 : .poll_group_add = nvme_pcie_poll_group_add,
354 : .poll_group_remove = nvme_pcie_poll_group_remove,
355 : .poll_group_process_completions = nvme_pcie_poll_group_process_completions,
356 : .poll_group_destroy = nvme_pcie_poll_group_destroy,
357 : .poll_group_get_stats = nvme_pcie_poll_group_get_stats,
358 : .poll_group_free_stats = nvme_pcie_poll_group_free_stats
359 : };
360 :
361 0 : SPDK_NVME_TRANSPORT_REGISTER(vfio, &vfio_ops);
362 :
363 0 : SPDK_LOG_REGISTER_COMPONENT(nvme_vfio)
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