Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2015 Intel Corporation.
3 : * All rights reserved.
4 : */
5 :
6 : #include "spdk/stdinc.h"
7 :
8 : #include "ioat_internal.h"
9 :
10 : #include "spdk/env.h"
11 : #include "spdk/util.h"
12 : #include "spdk/memory.h"
13 :
14 : #include "spdk/log.h"
15 :
16 : struct ioat_driver {
17 : pthread_mutex_t lock;
18 : TAILQ_HEAD(, spdk_ioat_chan) attached_chans;
19 : };
20 :
21 : static struct ioat_driver g_ioat_driver = {
22 : .lock = PTHREAD_MUTEX_INITIALIZER,
23 : .attached_chans = TAILQ_HEAD_INITIALIZER(g_ioat_driver.attached_chans),
24 : };
25 :
26 : static uint64_t
27 0 : ioat_get_chansts(struct spdk_ioat_chan *ioat)
28 : {
29 0 : return spdk_mmio_read_8(&ioat->regs->chansts);
30 : }
31 :
32 : static void
33 0 : ioat_write_chancmp(struct spdk_ioat_chan *ioat, uint64_t addr)
34 : {
35 0 : spdk_mmio_write_8(&ioat->regs->chancmp, addr);
36 0 : }
37 :
38 : static void
39 0 : ioat_write_chainaddr(struct spdk_ioat_chan *ioat, uint64_t addr)
40 : {
41 0 : spdk_mmio_write_8(&ioat->regs->chainaddr, addr);
42 0 : }
43 :
44 : static inline void
45 0 : ioat_suspend(struct spdk_ioat_chan *ioat)
46 : {
47 0 : ioat->regs->chancmd = SPDK_IOAT_CHANCMD_SUSPEND;
48 0 : }
49 :
50 : static inline void
51 0 : ioat_reset(struct spdk_ioat_chan *ioat)
52 : {
53 0 : ioat->regs->chancmd = SPDK_IOAT_CHANCMD_RESET;
54 0 : }
55 :
56 : static inline uint32_t
57 0 : ioat_reset_pending(struct spdk_ioat_chan *ioat)
58 : {
59 0 : uint8_t cmd;
60 :
61 0 : cmd = ioat->regs->chancmd;
62 0 : return (cmd & SPDK_IOAT_CHANCMD_RESET) == SPDK_IOAT_CHANCMD_RESET;
63 0 : }
64 :
65 : static int
66 0 : ioat_map_pci_bar(struct spdk_ioat_chan *ioat)
67 : {
68 0 : int regs_bar, rc;
69 0 : void *addr;
70 0 : uint64_t phys_addr, size;
71 :
72 0 : regs_bar = 0;
73 0 : rc = spdk_pci_device_map_bar(ioat->device, regs_bar, &addr, &phys_addr, &size);
74 0 : if (rc != 0 || addr == NULL) {
75 0 : SPDK_ERRLOG("pci_device_map_range failed with error code %d\n",
76 : rc);
77 0 : return -1;
78 : }
79 :
80 0 : ioat->regs = (volatile struct spdk_ioat_registers *)addr;
81 :
82 0 : return 0;
83 0 : }
84 :
85 : static int
86 0 : ioat_unmap_pci_bar(struct spdk_ioat_chan *ioat)
87 : {
88 0 : int rc = 0;
89 0 : void *addr = (void *)ioat->regs;
90 :
91 0 : if (addr) {
92 0 : rc = spdk_pci_device_unmap_bar(ioat->device, 0, addr);
93 0 : }
94 0 : return rc;
95 0 : }
96 :
97 :
98 : static inline uint32_t
99 0 : ioat_get_active(struct spdk_ioat_chan *ioat)
100 : {
101 0 : return (ioat->head - ioat->tail) & ((1 << ioat->ring_size_order) - 1);
102 : }
103 :
104 : static inline uint32_t
105 0 : ioat_get_ring_space(struct spdk_ioat_chan *ioat)
106 : {
107 0 : return (1 << ioat->ring_size_order) - ioat_get_active(ioat) - 1;
108 : }
109 :
110 : static uint32_t
111 0 : ioat_get_ring_index(struct spdk_ioat_chan *ioat, uint32_t index)
112 : {
113 0 : return index & ((1 << ioat->ring_size_order) - 1);
114 : }
115 :
116 : static void
117 0 : ioat_get_ring_entry(struct spdk_ioat_chan *ioat, uint32_t index,
118 : struct ioat_descriptor **desc,
119 : union spdk_ioat_hw_desc **hw_desc)
120 : {
121 0 : uint32_t i = ioat_get_ring_index(ioat, index);
122 :
123 0 : *desc = &ioat->ring[i];
124 0 : *hw_desc = &ioat->hw_ring[i];
125 0 : }
126 :
127 : static void
128 0 : ioat_submit_single(struct spdk_ioat_chan *ioat)
129 : {
130 0 : ioat->head++;
131 0 : }
132 :
133 : void
134 0 : spdk_ioat_flush(struct spdk_ioat_chan *ioat)
135 : {
136 0 : uint32_t index = ioat_get_ring_index(ioat, ioat->head - 1);
137 0 : union spdk_ioat_hw_desc *hw_desc;
138 :
139 0 : hw_desc = &ioat->hw_ring[index];
140 0 : hw_desc->dma.u.control.completion_update = 1;
141 0 : ioat->regs->dmacount = (uint16_t)ioat->head;
142 0 : }
143 :
144 : static struct ioat_descriptor *
145 0 : ioat_prep_null(struct spdk_ioat_chan *ioat)
146 : {
147 0 : struct ioat_descriptor *desc;
148 0 : union spdk_ioat_hw_desc *hw_desc;
149 :
150 0 : if (ioat_get_ring_space(ioat) < 1) {
151 0 : return NULL;
152 : }
153 :
154 0 : ioat_get_ring_entry(ioat, ioat->head, &desc, &hw_desc);
155 :
156 0 : hw_desc->dma.u.control_raw = 0;
157 0 : hw_desc->dma.u.control.op = SPDK_IOAT_OP_COPY;
158 0 : hw_desc->dma.u.control.null = 1;
159 :
160 0 : hw_desc->dma.size = 8;
161 0 : hw_desc->dma.src_addr = 0;
162 0 : hw_desc->dma.dest_addr = 0;
163 :
164 0 : desc->callback_fn = NULL;
165 0 : desc->callback_arg = NULL;
166 :
167 0 : ioat_submit_single(ioat);
168 :
169 0 : return desc;
170 0 : }
171 :
172 : static struct ioat_descriptor *
173 0 : ioat_prep_copy(struct spdk_ioat_chan *ioat, uint64_t dst,
174 : uint64_t src, uint32_t len)
175 : {
176 0 : struct ioat_descriptor *desc;
177 0 : union spdk_ioat_hw_desc *hw_desc;
178 :
179 0 : assert(len <= ioat->max_xfer_size);
180 :
181 0 : if (ioat_get_ring_space(ioat) < 1) {
182 0 : return NULL;
183 : }
184 :
185 0 : ioat_get_ring_entry(ioat, ioat->head, &desc, &hw_desc);
186 :
187 0 : hw_desc->dma.u.control_raw = 0;
188 0 : hw_desc->dma.u.control.op = SPDK_IOAT_OP_COPY;
189 :
190 0 : hw_desc->dma.size = len;
191 0 : hw_desc->dma.src_addr = src;
192 0 : hw_desc->dma.dest_addr = dst;
193 :
194 0 : desc->callback_fn = NULL;
195 0 : desc->callback_arg = NULL;
196 :
197 0 : ioat_submit_single(ioat);
198 :
199 0 : return desc;
200 0 : }
201 :
202 : static struct ioat_descriptor *
203 0 : ioat_prep_fill(struct spdk_ioat_chan *ioat, uint64_t dst,
204 : uint64_t fill_pattern, uint32_t len)
205 : {
206 0 : struct ioat_descriptor *desc;
207 0 : union spdk_ioat_hw_desc *hw_desc;
208 :
209 0 : assert(len <= ioat->max_xfer_size);
210 :
211 0 : if (ioat_get_ring_space(ioat) < 1) {
212 0 : return NULL;
213 : }
214 :
215 0 : ioat_get_ring_entry(ioat, ioat->head, &desc, &hw_desc);
216 :
217 0 : hw_desc->fill.u.control_raw = 0;
218 0 : hw_desc->fill.u.control.op = SPDK_IOAT_OP_FILL;
219 :
220 0 : hw_desc->fill.size = len;
221 0 : hw_desc->fill.src_data = fill_pattern;
222 0 : hw_desc->fill.dest_addr = dst;
223 :
224 0 : desc->callback_fn = NULL;
225 0 : desc->callback_arg = NULL;
226 :
227 0 : ioat_submit_single(ioat);
228 :
229 0 : return desc;
230 0 : }
231 :
232 : static int
233 0 : ioat_reset_hw(struct spdk_ioat_chan *ioat)
234 : {
235 0 : int timeout;
236 0 : uint64_t status;
237 0 : uint32_t chanerr;
238 0 : int rc;
239 :
240 0 : status = ioat_get_chansts(ioat);
241 0 : if (is_ioat_active(status) || is_ioat_idle(status)) {
242 0 : ioat_suspend(ioat);
243 0 : }
244 :
245 0 : timeout = 20; /* in milliseconds */
246 0 : while (is_ioat_active(status) || is_ioat_idle(status)) {
247 0 : spdk_delay_us(1000);
248 0 : timeout--;
249 0 : if (timeout == 0) {
250 0 : SPDK_ERRLOG("timed out waiting for suspend\n");
251 0 : return -1;
252 : }
253 0 : status = ioat_get_chansts(ioat);
254 : }
255 :
256 : /*
257 : * Clear any outstanding errors.
258 : * CHANERR is write-1-to-clear, so write the current CHANERR bits back to reset everything.
259 : */
260 0 : chanerr = ioat->regs->chanerr;
261 0 : ioat->regs->chanerr = chanerr;
262 :
263 0 : if (ioat->regs->cbver < SPDK_IOAT_VER_3_3) {
264 0 : rc = spdk_pci_device_cfg_read32(ioat->device, &chanerr,
265 : SPDK_IOAT_PCI_CHANERR_INT_OFFSET);
266 0 : if (rc) {
267 0 : SPDK_ERRLOG("failed to read the internal channel error register\n");
268 0 : return -1;
269 : }
270 :
271 0 : spdk_pci_device_cfg_write32(ioat->device, chanerr,
272 : SPDK_IOAT_PCI_CHANERR_INT_OFFSET);
273 0 : }
274 :
275 0 : ioat_reset(ioat);
276 :
277 0 : timeout = 20;
278 0 : while (ioat_reset_pending(ioat)) {
279 0 : spdk_delay_us(1000);
280 0 : timeout--;
281 0 : if (timeout == 0) {
282 0 : SPDK_ERRLOG("timed out waiting for reset\n");
283 0 : return -1;
284 : }
285 : }
286 :
287 0 : return 0;
288 0 : }
289 :
290 : static int
291 0 : ioat_process_channel_events(struct spdk_ioat_chan *ioat)
292 : {
293 0 : struct ioat_descriptor *desc;
294 0 : uint64_t status, completed_descriptor, hw_desc_phys_addr, events_count = 0;
295 0 : uint32_t tail;
296 :
297 0 : if (ioat->head == ioat->tail) {
298 0 : return 0;
299 : }
300 :
301 0 : status = *ioat->comp_update;
302 0 : completed_descriptor = status & SPDK_IOAT_CHANSTS_COMPLETED_DESCRIPTOR_MASK;
303 :
304 0 : if (is_ioat_halted(status)) {
305 0 : SPDK_ERRLOG("Channel halted (%x)\n", ioat->regs->chanerr);
306 0 : return -1;
307 : }
308 :
309 0 : if (completed_descriptor == ioat->last_seen) {
310 0 : return 0;
311 : }
312 :
313 0 : do {
314 0 : tail = ioat_get_ring_index(ioat, ioat->tail);
315 0 : desc = &ioat->ring[tail];
316 :
317 0 : if (desc->callback_fn) {
318 0 : desc->callback_fn(desc->callback_arg);
319 0 : }
320 :
321 0 : hw_desc_phys_addr = desc->phys_addr;
322 0 : ioat->tail++;
323 0 : events_count++;
324 0 : } while (hw_desc_phys_addr != completed_descriptor);
325 :
326 0 : ioat->last_seen = hw_desc_phys_addr;
327 :
328 0 : return events_count;
329 0 : }
330 :
331 : static void
332 0 : ioat_channel_destruct(struct spdk_ioat_chan *ioat)
333 : {
334 0 : ioat_unmap_pci_bar(ioat);
335 :
336 0 : if (ioat->ring) {
337 0 : free(ioat->ring);
338 0 : }
339 :
340 0 : if (ioat->hw_ring) {
341 0 : spdk_free(ioat->hw_ring);
342 0 : }
343 :
344 0 : if (ioat->comp_update) {
345 0 : spdk_free((void *)ioat->comp_update);
346 0 : ioat->comp_update = NULL;
347 0 : }
348 0 : }
349 :
350 : uint32_t
351 0 : spdk_ioat_get_max_descriptors(struct spdk_ioat_chan *ioat)
352 : {
353 0 : return 1 << ioat->ring_size_order;
354 : }
355 :
356 : static int
357 0 : ioat_channel_start(struct spdk_ioat_chan *ioat)
358 : {
359 0 : uint8_t xfercap, version;
360 0 : uint64_t status = 0;
361 0 : int i, num_descriptors;
362 0 : uint64_t comp_update_bus_addr = 0;
363 0 : uint64_t phys_addr;
364 :
365 0 : if (ioat_map_pci_bar(ioat) != 0) {
366 0 : SPDK_ERRLOG("ioat_map_pci_bar() failed\n");
367 0 : return -1;
368 : }
369 :
370 0 : version = ioat->regs->cbver;
371 0 : if (version < SPDK_IOAT_VER_3_0) {
372 0 : SPDK_ERRLOG(" unsupported IOAT version %u.%u\n",
373 : version >> 4, version & 0xF);
374 0 : return -1;
375 : }
376 :
377 : /* Always support DMA copy */
378 0 : ioat->dma_capabilities = SPDK_IOAT_ENGINE_COPY_SUPPORTED;
379 0 : if (ioat->regs->dmacapability & SPDK_IOAT_DMACAP_BFILL) {
380 0 : ioat->dma_capabilities |= SPDK_IOAT_ENGINE_FILL_SUPPORTED;
381 0 : }
382 0 : xfercap = ioat->regs->xfercap;
383 :
384 : /* Only bits [4:0] are valid. */
385 0 : xfercap &= 0x1f;
386 0 : if (xfercap == 0) {
387 : /* 0 means 4 GB max transfer size. */
388 0 : ioat->max_xfer_size = 1ULL << 32;
389 0 : } else if (xfercap < 12) {
390 : /* XFERCAP must be at least 12 (4 KB) according to the spec. */
391 0 : SPDK_ERRLOG("invalid XFERCAP value %u\n", xfercap);
392 0 : return -1;
393 : } else {
394 0 : ioat->max_xfer_size = 1U << xfercap;
395 : }
396 :
397 0 : ioat->comp_update = spdk_zmalloc(sizeof(*ioat->comp_update), SPDK_IOAT_CHANCMP_ALIGN,
398 : NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
399 0 : if (ioat->comp_update == NULL) {
400 0 : return -1;
401 : }
402 :
403 0 : comp_update_bus_addr = spdk_vtophys((void *)ioat->comp_update, NULL);
404 0 : if (comp_update_bus_addr == SPDK_VTOPHYS_ERROR) {
405 0 : return -1;
406 : }
407 :
408 0 : ioat->ring_size_order = IOAT_DEFAULT_ORDER;
409 :
410 0 : num_descriptors = 1 << ioat->ring_size_order;
411 :
412 0 : ioat->ring = calloc(num_descriptors, sizeof(struct ioat_descriptor));
413 0 : if (!ioat->ring) {
414 0 : return -1;
415 : }
416 :
417 0 : ioat->hw_ring = spdk_zmalloc(num_descriptors * sizeof(union spdk_ioat_hw_desc), 64,
418 : NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
419 0 : if (!ioat->hw_ring) {
420 0 : return -1;
421 : }
422 :
423 0 : for (i = 0; i < num_descriptors; i++) {
424 0 : phys_addr = spdk_vtophys(&ioat->hw_ring[i], NULL);
425 0 : if (phys_addr == SPDK_VTOPHYS_ERROR) {
426 0 : SPDK_ERRLOG("Failed to translate descriptor %u to physical address\n", i);
427 0 : return -1;
428 : }
429 :
430 0 : ioat->ring[i].phys_addr = phys_addr;
431 0 : ioat->hw_ring[ioat_get_ring_index(ioat, i - 1)].generic.next = phys_addr;
432 0 : }
433 :
434 0 : ioat->head = 0;
435 0 : ioat->tail = 0;
436 0 : ioat->last_seen = 0;
437 :
438 0 : ioat_reset_hw(ioat);
439 :
440 0 : ioat->regs->chanctrl = SPDK_IOAT_CHANCTRL_ANY_ERR_ABORT_EN;
441 0 : ioat_write_chancmp(ioat, comp_update_bus_addr);
442 0 : ioat_write_chainaddr(ioat, ioat->ring[0].phys_addr);
443 :
444 0 : ioat_prep_null(ioat);
445 0 : spdk_ioat_flush(ioat);
446 :
447 0 : i = 100;
448 0 : while (i-- > 0) {
449 0 : spdk_delay_us(100);
450 0 : status = ioat_get_chansts(ioat);
451 0 : if (is_ioat_idle(status)) {
452 0 : break;
453 : }
454 : }
455 :
456 0 : if (is_ioat_idle(status)) {
457 0 : ioat_process_channel_events(ioat);
458 0 : } else {
459 0 : SPDK_ERRLOG("could not start channel: status = %p\n error = %#x\n",
460 : (void *)status, ioat->regs->chanerr);
461 0 : return -1;
462 : }
463 :
464 0 : return 0;
465 0 : }
466 :
467 : /* Caller must hold g_ioat_driver.lock */
468 : static struct spdk_ioat_chan *
469 0 : ioat_attach(struct spdk_pci_device *device)
470 : {
471 0 : struct spdk_ioat_chan *ioat;
472 0 : uint32_t cmd_reg;
473 :
474 0 : ioat = calloc(1, sizeof(struct spdk_ioat_chan));
475 0 : if (ioat == NULL) {
476 0 : return NULL;
477 : }
478 :
479 : /* Enable PCI busmaster. */
480 0 : spdk_pci_device_cfg_read32(device, &cmd_reg, 4);
481 0 : cmd_reg |= 0x4;
482 0 : spdk_pci_device_cfg_write32(device, cmd_reg, 4);
483 :
484 0 : ioat->device = device;
485 :
486 0 : if (ioat_channel_start(ioat) != 0) {
487 0 : ioat_channel_destruct(ioat);
488 0 : free(ioat);
489 0 : return NULL;
490 : }
491 :
492 0 : return ioat;
493 0 : }
494 :
495 : struct ioat_enum_ctx {
496 : spdk_ioat_probe_cb probe_cb;
497 : spdk_ioat_attach_cb attach_cb;
498 : void *cb_ctx;
499 : };
500 :
501 : /* This function must only be called while holding g_ioat_driver.lock */
502 : static int
503 0 : ioat_enum_cb(void *ctx, struct spdk_pci_device *pci_dev)
504 : {
505 0 : struct ioat_enum_ctx *enum_ctx = ctx;
506 0 : struct spdk_ioat_chan *ioat;
507 :
508 : /* Verify that this device is not already attached */
509 0 : TAILQ_FOREACH(ioat, &g_ioat_driver.attached_chans, tailq) {
510 : /*
511 : * NOTE: This assumes that the PCI abstraction layer will use the same device handle
512 : * across enumerations; we could compare by BDF instead if this is not true.
513 : */
514 0 : if (pci_dev == ioat->device) {
515 0 : return 0;
516 : }
517 0 : }
518 :
519 0 : if (enum_ctx->probe_cb(enum_ctx->cb_ctx, pci_dev)) {
520 : /*
521 : * Since I/OAT init is relatively quick, just perform the full init during probing.
522 : * If this turns out to be a bottleneck later, this can be changed to work like
523 : * NVMe with a list of devices to initialize in parallel.
524 : */
525 0 : ioat = ioat_attach(pci_dev);
526 0 : if (ioat == NULL) {
527 0 : SPDK_ERRLOG("ioat_attach() failed\n");
528 0 : return -1;
529 : }
530 :
531 0 : TAILQ_INSERT_TAIL(&g_ioat_driver.attached_chans, ioat, tailq);
532 :
533 0 : enum_ctx->attach_cb(enum_ctx->cb_ctx, pci_dev, ioat);
534 0 : }
535 :
536 0 : return 0;
537 0 : }
538 :
539 : int
540 0 : spdk_ioat_probe(void *cb_ctx, spdk_ioat_probe_cb probe_cb, spdk_ioat_attach_cb attach_cb)
541 : {
542 0 : int rc;
543 0 : struct ioat_enum_ctx enum_ctx;
544 :
545 0 : pthread_mutex_lock(&g_ioat_driver.lock);
546 :
547 0 : enum_ctx.probe_cb = probe_cb;
548 0 : enum_ctx.attach_cb = attach_cb;
549 0 : enum_ctx.cb_ctx = cb_ctx;
550 :
551 0 : rc = spdk_pci_enumerate(spdk_pci_ioat_get_driver(), ioat_enum_cb, &enum_ctx);
552 :
553 0 : pthread_mutex_unlock(&g_ioat_driver.lock);
554 :
555 0 : return rc;
556 0 : }
557 :
558 : void
559 0 : spdk_ioat_detach(struct spdk_ioat_chan *ioat)
560 : {
561 0 : struct ioat_driver *driver = &g_ioat_driver;
562 :
563 : /* ioat should be in the free list (not registered to a thread)
564 : * when calling ioat_detach().
565 : */
566 0 : pthread_mutex_lock(&driver->lock);
567 0 : TAILQ_REMOVE(&driver->attached_chans, ioat, tailq);
568 0 : pthread_mutex_unlock(&driver->lock);
569 :
570 0 : ioat_channel_destruct(ioat);
571 0 : free(ioat);
572 0 : }
573 :
574 : int
575 0 : spdk_ioat_build_copy(struct spdk_ioat_chan *ioat, void *cb_arg, spdk_ioat_req_cb cb_fn,
576 : void *dst, const void *src, uint64_t nbytes)
577 : {
578 0 : struct ioat_descriptor *last_desc = NULL;
579 0 : uint64_t remaining, op_size;
580 0 : uint64_t vdst, vsrc;
581 0 : uint64_t pdst_addr, psrc_addr, dst_len, src_len;
582 0 : uint32_t orig_head;
583 :
584 0 : if (!ioat) {
585 0 : return -EINVAL;
586 : }
587 :
588 0 : orig_head = ioat->head;
589 :
590 0 : vdst = (uint64_t)dst;
591 0 : vsrc = (uint64_t)src;
592 :
593 0 : remaining = nbytes;
594 0 : while (remaining) {
595 0 : src_len = dst_len = remaining;
596 :
597 0 : psrc_addr = spdk_vtophys((void *)vsrc, &src_len);
598 0 : if (psrc_addr == SPDK_VTOPHYS_ERROR) {
599 0 : return -EINVAL;
600 : }
601 0 : pdst_addr = spdk_vtophys((void *)vdst, &dst_len);
602 0 : if (pdst_addr == SPDK_VTOPHYS_ERROR) {
603 0 : return -EINVAL;
604 : }
605 :
606 0 : op_size = spdk_min(dst_len, src_len);
607 0 : op_size = spdk_min(op_size, ioat->max_xfer_size);
608 0 : remaining -= op_size;
609 :
610 0 : last_desc = ioat_prep_copy(ioat, pdst_addr, psrc_addr, op_size);
611 :
612 0 : if (remaining == 0 || last_desc == NULL) {
613 0 : break;
614 : }
615 :
616 0 : vsrc += op_size;
617 0 : vdst += op_size;
618 :
619 : }
620 : /* Issue null descriptor for null transfer */
621 0 : if (nbytes == 0) {
622 0 : last_desc = ioat_prep_null(ioat);
623 0 : }
624 :
625 0 : if (last_desc) {
626 0 : last_desc->callback_fn = cb_fn;
627 0 : last_desc->callback_arg = cb_arg;
628 0 : } else {
629 : /*
630 : * Ran out of descriptors in the ring - reset head to leave things as they were
631 : * in case we managed to fill out any descriptors.
632 : */
633 0 : ioat->head = orig_head;
634 0 : return -ENOMEM;
635 : }
636 :
637 0 : return 0;
638 0 : }
639 :
640 : int
641 0 : spdk_ioat_submit_copy(struct spdk_ioat_chan *ioat, void *cb_arg, spdk_ioat_req_cb cb_fn,
642 : void *dst, const void *src, uint64_t nbytes)
643 : {
644 0 : int rc;
645 :
646 0 : rc = spdk_ioat_build_copy(ioat, cb_arg, cb_fn, dst, src, nbytes);
647 0 : if (rc != 0) {
648 0 : return rc;
649 : }
650 :
651 0 : spdk_ioat_flush(ioat);
652 0 : return 0;
653 0 : }
654 :
655 : int
656 0 : spdk_ioat_build_fill(struct spdk_ioat_chan *ioat, void *cb_arg, spdk_ioat_req_cb cb_fn,
657 : void *dst, uint64_t fill_pattern, uint64_t nbytes)
658 : {
659 0 : struct ioat_descriptor *last_desc = NULL;
660 0 : uint64_t remaining, op_size;
661 0 : uint64_t vdst;
662 0 : uint64_t pdst_addr, dst_len;
663 0 : uint32_t orig_head;
664 :
665 0 : if (!ioat) {
666 0 : return -EINVAL;
667 : }
668 :
669 0 : if (!(ioat->dma_capabilities & SPDK_IOAT_ENGINE_FILL_SUPPORTED)) {
670 0 : SPDK_ERRLOG("Channel does not support memory fill\n");
671 0 : return -1;
672 : }
673 :
674 0 : orig_head = ioat->head;
675 :
676 0 : vdst = (uint64_t)dst;
677 0 : remaining = nbytes;
678 :
679 0 : while (remaining) {
680 0 : dst_len = remaining;
681 0 : pdst_addr = spdk_vtophys((void *)vdst, &dst_len);
682 0 : if (pdst_addr == SPDK_VTOPHYS_ERROR) {
683 0 : return -EINVAL;
684 : }
685 :
686 0 : op_size = spdk_min(dst_len, ioat->max_xfer_size);
687 0 : remaining -= op_size;
688 :
689 0 : last_desc = ioat_prep_fill(ioat, pdst_addr, fill_pattern, op_size);
690 :
691 0 : if (remaining == 0 || last_desc == NULL) {
692 0 : break;
693 : }
694 :
695 0 : vdst += op_size;
696 : }
697 :
698 0 : if (last_desc) {
699 0 : last_desc->callback_fn = cb_fn;
700 0 : last_desc->callback_arg = cb_arg;
701 0 : } else {
702 : /*
703 : * Ran out of descriptors in the ring - reset head to leave things as they were
704 : * in case we managed to fill out any descriptors.
705 : */
706 0 : ioat->head = orig_head;
707 0 : return -ENOMEM;
708 : }
709 :
710 0 : return 0;
711 0 : }
712 :
713 : int
714 0 : spdk_ioat_submit_fill(struct spdk_ioat_chan *ioat, void *cb_arg, spdk_ioat_req_cb cb_fn,
715 : void *dst, uint64_t fill_pattern, uint64_t nbytes)
716 : {
717 0 : int rc;
718 :
719 0 : rc = spdk_ioat_build_fill(ioat, cb_arg, cb_fn, dst, fill_pattern, nbytes);
720 0 : if (rc != 0) {
721 0 : return rc;
722 : }
723 :
724 0 : spdk_ioat_flush(ioat);
725 0 : return 0;
726 0 : }
727 :
728 : uint32_t
729 0 : spdk_ioat_get_dma_capabilities(struct spdk_ioat_chan *ioat)
730 : {
731 0 : if (!ioat) {
732 0 : return 0;
733 : }
734 0 : return ioat->dma_capabilities;
735 0 : }
736 :
737 : int
738 0 : spdk_ioat_process_events(struct spdk_ioat_chan *ioat)
739 : {
740 0 : return ioat_process_channel_events(ioat);
741 : }
742 :
743 1 : SPDK_LOG_REGISTER_COMPONENT(ioat)
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